diff options
Diffstat (limited to 'drivers/regulator/core.c')
| -rw-r--r-- | drivers/regulator/core.c | 1982 |
1 files changed, 1520 insertions, 462 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 9fa20957847..4c1f999041d 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -13,26 +13,33 @@ * */ -#define pr_fmt(fmt) "%s: " fmt, __func__ - #include <linux/kernel.h> #include <linux/init.h> #include <linux/debugfs.h> #include <linux/device.h> #include <linux/slab.h> +#include <linux/async.h> #include <linux/err.h> #include <linux/mutex.h> #include <linux/suspend.h> #include <linux/delay.h> +#include <linux/gpio.h> +#include <linux/of.h> +#include <linux/regmap.h> +#include <linux/regulator/of_regulator.h> #include <linux/regulator/consumer.h> #include <linux/regulator/driver.h> #include <linux/regulator/machine.h> +#include <linux/module.h> #define CREATE_TRACE_POINTS #include <trace/events/regulator.h> #include "dummy.h" +#include "internal.h" +#define rdev_crit(rdev, fmt, ...) \ + pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) #define rdev_err(rdev, fmt, ...) \ pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) #define rdev_warn(rdev, fmt, ...) \ @@ -45,12 +52,11 @@ static DEFINE_MUTEX(regulator_list_mutex); static LIST_HEAD(regulator_list); static LIST_HEAD(regulator_map_list); +static LIST_HEAD(regulator_ena_gpio_list); +static LIST_HEAD(regulator_supply_alias_list); static bool has_full_constraints; -static bool board_wants_dummy_regulator; -#ifdef CONFIG_DEBUG_FS static struct dentry *debugfs_root; -#endif /* * struct regulator_map @@ -65,24 +71,33 @@ struct regulator_map { }; /* - * struct regulator + * struct regulator_enable_gpio * - * One for each consumer device. + * Management for shared enable GPIO pin */ -struct regulator { - struct device *dev; +struct regulator_enable_gpio { struct list_head list; - int uA_load; - int min_uV; - int max_uV; - char *supply_name; - struct device_attribute dev_attr; - struct regulator_dev *rdev; + int gpio; + u32 enable_count; /* a number of enabled shared GPIO */ + u32 request_count; /* a number of requested shared GPIO */ + unsigned int ena_gpio_invert:1; +}; + +/* + * struct regulator_supply_alias + * + * Used to map lookups for a supply onto an alternative device. + */ +struct regulator_supply_alias { + struct list_head list; + struct device *src_dev; + const char *src_supply; + struct device *alias_dev; + const char *alias_supply; }; static int _regulator_is_enabled(struct regulator_dev *rdev); -static int _regulator_disable(struct regulator_dev *rdev, - struct regulator_dev **supply_rdev_ptr); +static int _regulator_disable(struct regulator_dev *rdev); static int _regulator_get_voltage(struct regulator_dev *rdev); static int _regulator_get_current_limit(struct regulator_dev *rdev); static unsigned int _regulator_get_mode(struct regulator_dev *rdev); @@ -90,6 +105,9 @@ static void _notifier_call_chain(struct regulator_dev *rdev, unsigned long event, void *data); static int _regulator_do_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV); +static struct regulator *create_regulator(struct regulator_dev *rdev, + struct device *dev, + const char *supply_name); static const char *rdev_get_name(struct regulator_dev *rdev) { @@ -101,26 +119,47 @@ static const char *rdev_get_name(struct regulator_dev *rdev) return ""; } -/* gets the regulator for a given consumer device */ -static struct regulator *get_device_regulator(struct device *dev) +static bool have_full_constraints(void) { - struct regulator *regulator = NULL; - struct regulator_dev *rdev; + return has_full_constraints || of_have_populated_dt(); +} - mutex_lock(®ulator_list_mutex); - list_for_each_entry(rdev, ®ulator_list, list) { - mutex_lock(&rdev->mutex); - list_for_each_entry(regulator, &rdev->consumer_list, list) { - if (regulator->dev == dev) { - mutex_unlock(&rdev->mutex); - mutex_unlock(®ulator_list_mutex); - return regulator; - } - } - mutex_unlock(&rdev->mutex); +/** + * of_get_regulator - get a regulator device node based on supply name + * @dev: Device pointer for the consumer (of regulator) device + * @supply: regulator supply name + * + * Extract the regulator device node corresponding to the supply name. + * returns the device node corresponding to the regulator if found, else + * returns NULL. + */ +static struct device_node *of_get_regulator(struct device *dev, const char *supply) +{ + struct device_node *regnode = NULL; + char prop_name[32]; /* 32 is max size of property name */ + + dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); + + snprintf(prop_name, 32, "%s-supply", supply); + regnode = of_parse_phandle(dev->of_node, prop_name, 0); + + if (!regnode) { + dev_dbg(dev, "Looking up %s property in node %s failed", + prop_name, dev->of_node->full_name); + return NULL; } - mutex_unlock(®ulator_list_mutex); - return NULL; + return regnode; +} + +static int _regulator_can_change_status(struct regulator_dev *rdev) +{ + if (!rdev->constraints) + return 0; + + if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) + return 1; + else + return 0; } /* Platform voltage constraint check */ @@ -143,8 +182,11 @@ static int regulator_check_voltage(struct regulator_dev *rdev, if (*min_uV < rdev->constraints->min_uV) *min_uV = rdev->constraints->min_uV; - if (*min_uV > *max_uV) + if (*min_uV > *max_uV) { + rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", + *min_uV, *max_uV); return -EINVAL; + } return 0; } @@ -158,14 +200,24 @@ static int regulator_check_consumers(struct regulator_dev *rdev, struct regulator *regulator; list_for_each_entry(regulator, &rdev->consumer_list, list) { + /* + * Assume consumers that didn't say anything are OK + * with anything in the constraint range. + */ + if (!regulator->min_uV && !regulator->max_uV) + continue; + if (*max_uV > regulator->max_uV) *max_uV = regulator->max_uV; if (*min_uV < regulator->min_uV) *min_uV = regulator->min_uV; } - if (*min_uV > *max_uV) + if (*min_uV > *max_uV) { + rdev_err(rdev, "Restricting voltage, %u-%uuV\n", + *min_uV, *max_uV); return -EINVAL; + } return 0; } @@ -190,22 +242,26 @@ static int regulator_check_current_limit(struct regulator_dev *rdev, if (*min_uA < rdev->constraints->min_uA) *min_uA = rdev->constraints->min_uA; - if (*min_uA > *max_uA) + if (*min_uA > *max_uA) { + rdev_err(rdev, "unsupportable current range: %d-%duA\n", + *min_uA, *max_uA); return -EINVAL; + } return 0; } /* operating mode constraint check */ -static int regulator_check_mode(struct regulator_dev *rdev, int mode) +static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) { - switch (mode) { + switch (*mode) { case REGULATOR_MODE_FAST: case REGULATOR_MODE_NORMAL: case REGULATOR_MODE_IDLE: case REGULATOR_MODE_STANDBY: break; default: + rdev_err(rdev, "invalid mode %x specified\n", *mode); return -EINVAL; } @@ -217,11 +273,17 @@ static int regulator_check_mode(struct regulator_dev *rdev, int mode) rdev_err(rdev, "operation not allowed\n"); return -EPERM; } - if (!(rdev->constraints->valid_modes_mask & mode)) { - rdev_err(rdev, "invalid mode %x\n", mode); - return -EINVAL; + + /* The modes are bitmasks, the most power hungry modes having + * the lowest values. If the requested mode isn't supported + * try higher modes. */ + while (*mode) { + if (rdev->constraints->valid_modes_mask & *mode) + return 0; + *mode /= 2; } - return 0; + + return -EINVAL; } /* dynamic regulator mode switching constraint check */ @@ -238,18 +300,6 @@ static int regulator_check_drms(struct regulator_dev *rdev) return 0; } -static ssize_t device_requested_uA_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct regulator *regulator; - - regulator = get_device_regulator(dev); - if (regulator == NULL) - return 0; - - return sprintf(buf, "%d\n", regulator->uA_load); -} - static ssize_t regulator_uV_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -273,13 +323,14 @@ static ssize_t regulator_uA_show(struct device *dev, } static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); -static ssize_t regulator_name_show(struct device *dev, - struct device_attribute *attr, char *buf) +static ssize_t name_show(struct device *dev, struct device_attribute *attr, + char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); return sprintf(buf, "%s\n", rdev_get_name(rdev)); } +static DEVICE_ATTR_RO(name); static ssize_t regulator_print_opmode(char *buf, int mode) { @@ -362,6 +413,12 @@ static ssize_t regulator_status_show(struct device *dev, case REGULATOR_STATUS_STANDBY: label = "standby"; break; + case REGULATOR_STATUS_BYPASS: + label = "bypass"; + break; + case REGULATOR_STATUS_UNDEFINED: + label = "undefined"; + break; default: return -ERANGE; } @@ -433,15 +490,16 @@ static ssize_t regulator_total_uA_show(struct device *dev, } static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); -static ssize_t regulator_num_users_show(struct device *dev, - struct device_attribute *attr, char *buf) +static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, + char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); return sprintf(buf, "%d\n", rdev->use_count); } +static DEVICE_ATTR_RO(num_users); -static ssize_t regulator_type_show(struct device *dev, - struct device_attribute *attr, char *buf) +static ssize_t type_show(struct device *dev, struct device_attribute *attr, + char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); @@ -453,6 +511,7 @@ static ssize_t regulator_type_show(struct device *dev, } return sprintf(buf, "unknown\n"); } +static DEVICE_ATTR_RO(type); static ssize_t regulator_suspend_mem_uV_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -550,17 +609,39 @@ static ssize_t regulator_suspend_standby_state_show(struct device *dev, static DEVICE_ATTR(suspend_standby_state, 0444, regulator_suspend_standby_state_show, NULL); +static ssize_t regulator_bypass_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = dev_get_drvdata(dev); + const char *report; + bool bypass; + int ret; + + ret = rdev->desc->ops->get_bypass(rdev, &bypass); + + if (ret != 0) + report = "unknown"; + else if (bypass) + report = "enabled"; + else + report = "disabled"; + + return sprintf(buf, "%s\n", report); +} +static DEVICE_ATTR(bypass, 0444, + regulator_bypass_show, NULL); /* * These are the only attributes are present for all regulators. * Other attributes are a function of regulator functionality. */ -static struct device_attribute regulator_dev_attrs[] = { - __ATTR(name, 0444, regulator_name_show, NULL), - __ATTR(num_users, 0444, regulator_num_users_show, NULL), - __ATTR(type, 0444, regulator_type_show, NULL), - __ATTR_NULL, +static struct attribute *regulator_dev_attrs[] = { + &dev_attr_name.attr, + &dev_attr_num_users.attr, + &dev_attr_type.attr, + NULL, }; +ATTRIBUTE_GROUPS(regulator_dev); static void regulator_dev_release(struct device *dev) { @@ -571,7 +652,7 @@ static void regulator_dev_release(struct device *dev) static struct class regulator_class = { .name = "regulator", .dev_release = regulator_dev_release, - .dev_attrs = regulator_dev_attrs, + .dev_groups = regulator_dev_groups, }; /* Calculate the new optimum regulator operating mode based on the new total @@ -597,7 +678,7 @@ static void drms_uA_update(struct regulator_dev *rdev) /* get input voltage */ input_uV = 0; if (rdev->supply) - input_uV = _regulator_get_voltage(rdev); + input_uV = regulator_get_voltage(rdev->supply); if (input_uV <= 0) input_uV = rdev->constraints->input_uV; if (input_uV <= 0) @@ -612,7 +693,7 @@ static void drms_uA_update(struct regulator_dev *rdev) output_uV, current_uA); /* check the new mode is allowed */ - err = regulator_check_mode(rdev, mode); + err = regulator_mode_constrain(rdev, &mode); if (err == 0) rdev->desc->ops->set_mode(rdev, mode); } @@ -621,17 +702,14 @@ static int suspend_set_state(struct regulator_dev *rdev, struct regulator_state *rstate) { int ret = 0; - bool can_set_state; - - can_set_state = rdev->desc->ops->set_suspend_enable && - rdev->desc->ops->set_suspend_disable; /* If we have no suspend mode configration don't set anything; - * only warn if the driver actually makes the suspend mode - * configurable. + * only warn if the driver implements set_suspend_voltage or + * set_suspend_mode callback. */ if (!rstate->enabled && !rstate->disabled) { - if (can_set_state) + if (rdev->desc->ops->set_suspend_voltage || + rdev->desc->ops->set_suspend_mode) rdev_warn(rdev, "No configuration\n"); return 0; } @@ -641,15 +719,13 @@ static int suspend_set_state(struct regulator_dev *rdev, return -EINVAL; } - if (!can_set_state) { - rdev_err(rdev, "no way to set suspend state\n"); - return -EINVAL; - } - - if (rstate->enabled) + if (rstate->enabled && rdev->desc->ops->set_suspend_enable) ret = rdev->desc->ops->set_suspend_enable(rdev); - else + else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) ret = rdev->desc->ops->set_suspend_disable(rdev); + else /* OK if set_suspend_enable or set_suspend_disable is NULL */ + ret = 0; + if (ret < 0) { rdev_err(rdev, "failed to enabled/disable\n"); return ret; @@ -718,6 +794,10 @@ static void print_constraints(struct regulator_dev *rdev) count += sprintf(buf + count, "at %d mV ", ret / 1000); } + if (constraints->uV_offset) + count += sprintf(buf, "%dmV offset ", + constraints->uV_offset / 1000); + if (constraints->min_uA && constraints->max_uA) { if (constraints->min_uA == constraints->max_uA) count += sprintf(buf + count, "%d mA ", @@ -744,7 +824,15 @@ static void print_constraints(struct regulator_dev *rdev) if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) count += sprintf(buf + count, "standby"); + if (!count) + sprintf(buf, "no parameters"); + rdev_info(rdev, "%s\n", buf); + + if ((constraints->min_uV != constraints->max_uV) && + !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) + rdev_warn(rdev, + "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); } static int machine_constraints_voltage(struct regulator_dev *rdev, @@ -756,14 +844,22 @@ static int machine_constraints_voltage(struct regulator_dev *rdev, /* do we need to apply the constraint voltage */ if (rdev->constraints->apply_uV && rdev->constraints->min_uV == rdev->constraints->max_uV) { - ret = _regulator_do_set_voltage(rdev, - rdev->constraints->min_uV, - rdev->constraints->max_uV); - if (ret < 0) { - rdev_err(rdev, "failed to apply %duV constraint\n", - rdev->constraints->min_uV); - rdev->constraints = NULL; - return ret; + int current_uV = _regulator_get_voltage(rdev); + if (current_uV < 0) { + rdev_err(rdev, "failed to get the current voltage\n"); + return current_uV; + } + if (current_uV < rdev->constraints->min_uV || + current_uV > rdev->constraints->max_uV) { + ret = _regulator_do_set_voltage( + rdev, rdev->constraints->min_uV, + rdev->constraints->max_uV); + if (ret < 0) { + rdev_err(rdev, + "failed to apply %duV constraint\n", + rdev->constraints->min_uV); + return ret; + } } } @@ -814,7 +910,9 @@ static int machine_constraints_voltage(struct regulator_dev *rdev, /* final: [min_uV..max_uV] valid iff constraints valid */ if (max_uV < min_uV) { - rdev_err(rdev, "unsupportable voltage constraints\n"); + rdev_err(rdev, + "unsupportable voltage constraints %u-%uuV\n", + min_uV, max_uV); return -EINVAL; } @@ -834,6 +932,38 @@ static int machine_constraints_voltage(struct regulator_dev *rdev, return 0; } +static int machine_constraints_current(struct regulator_dev *rdev, + struct regulation_constraints *constraints) +{ + struct regulator_ops *ops = rdev->desc->ops; + int ret; + + if (!constraints->min_uA && !constraints->max_uA) + return 0; + + if (constraints->min_uA > constraints->max_uA) { + rdev_err(rdev, "Invalid current constraints\n"); + return -EINVAL; + } + + if (!ops->set_current_limit || !ops->get_current_limit) { + rdev_warn(rdev, "Operation of current configuration missing\n"); + return 0; + } + + /* Set regulator current in constraints range */ + ret = ops->set_current_limit(rdev, constraints->min_uA, + constraints->max_uA); + if (ret < 0) { + rdev_err(rdev, "Failed to set current constraint, %d\n", ret); + return ret; + } + + return 0; +} + +static int _regulator_do_enable(struct regulator_dev *rdev); + /** * set_machine_constraints - sets regulator constraints * @rdev: regulator source @@ -851,8 +981,12 @@ static int set_machine_constraints(struct regulator_dev *rdev, int ret = 0; struct regulator_ops *ops = rdev->desc->ops; - rdev->constraints = kmemdup(constraints, sizeof(*constraints), - GFP_KERNEL); + if (constraints) + rdev->constraints = kmemdup(constraints, sizeof(*constraints), + GFP_KERNEL); + else + rdev->constraints = kzalloc(sizeof(*constraints), + GFP_KERNEL); if (!rdev->constraints) return -ENOMEM; @@ -860,17 +994,20 @@ static int set_machine_constraints(struct regulator_dev *rdev, if (ret != 0) goto out; + ret = machine_constraints_current(rdev, rdev->constraints); + if (ret != 0) + goto out; + /* do we need to setup our suspend state */ - if (constraints->initial_state) { + if (rdev->constraints->initial_state) { ret = suspend_prepare(rdev, rdev->constraints->initial_state); if (ret < 0) { rdev_err(rdev, "failed to set suspend state\n"); - rdev->constraints = NULL; goto out; } } - if (constraints->initial_mode) { + if (rdev->constraints->initial_mode) { if (!ops->set_mode) { rdev_err(rdev, "no set_mode operation\n"); ret = -EINVAL; @@ -887,18 +1024,28 @@ static int set_machine_constraints(struct regulator_dev *rdev, /* If the constraints say the regulator should be on at this point * and we have control then make sure it is enabled. */ - if ((rdev->constraints->always_on || rdev->constraints->boot_on) && - ops->enable) { - ret = ops->enable(rdev); - if (ret < 0) { + if (rdev->constraints->always_on || rdev->constraints->boot_on) { + ret = _regulator_do_enable(rdev); + if (ret < 0 && ret != -EINVAL) { rdev_err(rdev, "failed to enable\n"); - rdev->constraints = NULL; + goto out; + } + } + + if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) + && ops->set_ramp_delay) { + ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); + if (ret < 0) { + rdev_err(rdev, "failed to set ramp_delay\n"); goto out; } } print_constraints(rdev); + return 0; out: + kfree(rdev->constraints); + rdev->constraints = NULL; return ret; } @@ -912,27 +1059,25 @@ out: * core if it's child is enabled. */ static int set_supply(struct regulator_dev *rdev, - struct regulator_dev *supply_rdev) + struct regulator_dev *supply_rdev) { int err; - err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, - "supply"); - if (err) { - rdev_err(rdev, "could not add device link %s err %d\n", - supply_rdev->dev.kobj.name, err); - goto out; + rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); + + rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); + if (rdev->supply == NULL) { + err = -ENOMEM; + return err; } - rdev->supply = supply_rdev; - list_add(&rdev->slist, &supply_rdev->supply_list); -out: - return err; + supply_rdev->open_count++; + + return 0; } /** * set_consumer_device_supply - Bind a regulator to a symbolic supply * @rdev: regulator source - * @consumer_dev: device the supply applies to * @consumer_dev_name: dev_name() string for device supply applies to * @supply: symbolic name for supply * @@ -940,22 +1085,14 @@ out: * sources to symbolic names for supplies for use by devices. Devices * should use these symbolic names to request regulators, avoiding the * need to provide board-specific regulator names as platform data. - * - * Only one of consumer_dev and consumer_dev_name may be specified. */ static int set_consumer_device_supply(struct regulator_dev *rdev, - struct device *consumer_dev, const char *consumer_dev_name, - const char *supply) + const char *consumer_dev_name, + const char *supply) { struct regulator_map *node; int has_dev; - if (consumer_dev && consumer_dev_name) - return -EINVAL; - - if (!consumer_dev_name && consumer_dev) - consumer_dev_name = dev_name(consumer_dev); - if (supply == NULL) return -EINVAL; @@ -975,11 +1112,12 @@ static int set_consumer_device_supply(struct regulator_dev *rdev, if (strcmp(node->supply, supply) != 0) continue; - dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", - dev_name(&node->regulator->dev), - node->regulator->desc->name, - supply, - dev_name(&rdev->dev), rdev_get_name(rdev)); + pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", + consumer_dev_name, + dev_name(&node->regulator->dev), + node->regulator->desc->name, + supply, + dev_name(&rdev->dev), rdev_get_name(rdev)); return -EBUSY; } @@ -1015,7 +1153,7 @@ static void unset_regulator_supplies(struct regulator_dev *rdev) } } -#define REG_STR_SIZE 32 +#define REG_STR_SIZE 64 static struct regulator *create_regulator(struct regulator_dev *rdev, struct device *dev, @@ -1034,52 +1172,55 @@ static struct regulator *create_regulator(struct regulator_dev *rdev, list_add(®ulator->list, &rdev->consumer_list); if (dev) { - /* create a 'requested_microamps_name' sysfs entry */ - size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", - supply_name); - if (size >= REG_STR_SIZE) - goto overflow_err; - regulator->dev = dev; - sysfs_attr_init(®ulator->dev_attr.attr); - regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); - if (regulator->dev_attr.attr.name == NULL) - goto attr_name_err; - - regulator->dev_attr.attr.mode = 0444; - regulator->dev_attr.show = device_requested_uA_show; - err = device_create_file(dev, ®ulator->dev_attr); - if (err < 0) { - rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); - goto attr_name_err; - } - /* also add a link to the device sysfs entry */ + /* Add a link to the device sysfs entry */ size = scnprintf(buf, REG_STR_SIZE, "%s-%s", dev->kobj.name, supply_name); if (size >= REG_STR_SIZE) - goto attr_err; + goto overflow_err; regulator->supply_name = kstrdup(buf, GFP_KERNEL); if (regulator->supply_name == NULL) - goto attr_err; + goto overflow_err; err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, buf); if (err) { rdev_warn(rdev, "could not add device link %s err %d\n", dev->kobj.name, err); - goto link_name_err; + /* non-fatal */ } + } else { + regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); + if (regulator->supply_name == NULL) + goto overflow_err; } + + regulator->debugfs = debugfs_create_dir(regulator->supply_name, + rdev->debugfs); + if (!regulator->debugfs) { + rdev_warn(rdev, "Failed to create debugfs directory\n"); + } else { + debugfs_create_u32("uA_load", 0444, regulator->debugfs, + ®ulator->uA_load); + debugfs_create_u32("min_uV", 0444, regulator->debugfs, + ®ulator->min_uV); + debugfs_create_u32("max_uV", 0444, regulator->debugfs, + ®ulator->max_uV); + } + + /* + * Check now if the regulator is an always on regulator - if + * it is then we don't need to do nearly so much work for + * enable/disable calls. + */ + if (!_regulator_can_change_status(rdev) && + _regulator_is_enabled(rdev)) + regulator->always_on = true; + mutex_unlock(&rdev->mutex); return regulator; -link_name_err: - kfree(regulator->supply_name); -attr_err: - device_remove_file(regulator->dev, ®ulator->dev_attr); -attr_name_err: - kfree(regulator->dev_attr.attr.name); overflow_err: list_del(®ulator->list); kfree(regulator); @@ -1089,30 +1230,78 @@ overflow_err: static int _regulator_get_enable_time(struct regulator_dev *rdev) { + if (rdev->constraints && rdev->constraints->enable_time) + return rdev->constraints->enable_time; if (!rdev->desc->ops->enable_time) - return 0; + return rdev->desc->enable_time; return rdev->desc->ops->enable_time(rdev); } -/* Internal regulator request function */ -static struct regulator *_regulator_get(struct device *dev, const char *id, - int exclusive) +static struct regulator_supply_alias *regulator_find_supply_alias( + struct device *dev, const char *supply) { - struct regulator_dev *rdev; + struct regulator_supply_alias *map; + + list_for_each_entry(map, ®ulator_supply_alias_list, list) + if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) + return map; + + return NULL; +} + +static void regulator_supply_alias(struct device **dev, const char **supply) +{ + struct regulator_supply_alias *map; + + map = regulator_find_supply_alias(*dev, *supply); + if (map) { + dev_dbg(*dev, "Mapping supply %s to %s,%s\n", + *supply, map->alias_supply, + dev_name(map->alias_dev)); + *dev = map->alias_dev; + *supply = map->alias_supply; + } +} + +static struct regulator_dev *regulator_dev_lookup(struct device *dev, + const char *supply, + int *ret) +{ + struct regulator_dev *r; + struct device_node *node; struct regulator_map *map; - struct regulator *regulator = ERR_PTR(-ENODEV); const char *devname = NULL; - int ret; - if (id == NULL) { - pr_err("get() with no identifier\n"); - return regulator; + regulator_supply_alias(&dev, &supply); + + /* first do a dt based lookup */ + if (dev && dev->of_node) { + node = of_get_regulator(dev, supply); + if (node) { + list_for_each_entry(r, ®ulator_list, list) + if (r->dev.parent && + node == r->dev.of_node) + return r; + *ret = -EPROBE_DEFER; + return NULL; + } else { + /* + * If we couldn't even get the node then it's + * not just that the device didn't register + * yet, there's no node and we'll never + * succeed. + */ + *ret = -ENODEV; + } } + /* if not found, try doing it non-dt way */ if (dev) devname = dev_name(dev); - mutex_lock(®ulator_list_mutex); + list_for_each_entry(r, ®ulator_list, list) + if (strcmp(rdev_get_name(r), supply) == 0) + return r; list_for_each_entry(map, ®ulator_map_list, list) { /* If the mapping has a device set up it must match */ @@ -1120,31 +1309,68 @@ static struct regulator *_regulator_get(struct device *dev, const char *id, (!devname || strcmp(map->dev_name, devname))) continue; - if (strcmp(map->supply, id) == 0) { - rdev = map->regulator; - goto found; - } + if (strcmp(map->supply, supply) == 0) + return map->regulator; } - if (board_wants_dummy_regulator) { - rdev = dummy_regulator_rdev; - goto found; + + return NULL; +} + +/* Internal regulator request function */ +static struct regulator *_regulator_get(struct device *dev, const char *id, + bool exclusive, bool allow_dummy) +{ + struct regulator_dev *rdev; + struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); + const char *devname = NULL; + int ret; + + if (id == NULL) { + pr_err("get() with no identifier\n"); + return ERR_PTR(-EINVAL); } -#ifdef CONFIG_REGULATOR_DUMMY + if (dev) + devname = dev_name(dev); + + if (have_full_constraints()) + ret = -ENODEV; + else + ret = -EPROBE_DEFER; + + mutex_lock(®ulator_list_mutex); + + rdev = regulator_dev_lookup(dev, id, &ret); + if (rdev) + goto found; + + regulator = ERR_PTR(ret); + + /* + * If we have return value from dev_lookup fail, we do not expect to + * succeed, so, quit with appropriate error value + */ + if (ret && ret != -ENODEV) + goto out; + if (!devname) devname = "deviceless"; - /* If the board didn't flag that it was fully constrained then - * substitute in a dummy regulator so consumers can continue. + /* + * Assume that a regulator is physically present and enabled + * even if it isn't hooked up and just provide a dummy. */ - if (!has_full_constraints) { + if (have_full_constraints() && allow_dummy) { pr_warn("%s supply %s not found, using dummy regulator\n", devname, id); + rdev = dummy_regulator_rdev; goto found; + /* Don't log an error when called from regulator_get_optional() */ + } else if (!have_full_constraints() || exclusive) { + dev_warn(dev, "dummy supplies not allowed\n"); } -#endif mutex_unlock(®ulator_list_mutex); return regulator; @@ -1167,6 +1393,7 @@ found: if (regulator == NULL) { regulator = ERR_PTR(-ENOMEM); module_put(rdev->owner); + goto out; } rdev->open_count++; @@ -1201,7 +1428,7 @@ out: */ struct regulator *regulator_get(struct device *dev, const char *id) { - return _regulator_get(dev, id, 0); + return _regulator_get(dev, id, false, true); } EXPORT_SYMBOL_GPL(regulator_get); @@ -1212,9 +1439,9 @@ EXPORT_SYMBOL_GPL(regulator_get); * * Returns a struct regulator corresponding to the regulator producer, * or IS_ERR() condition containing errno. Other consumers will be - * unable to obtain this reference is held and the use count for the - * regulator will be initialised to reflect the current state of the - * regulator. + * unable to obtain this regulator while this reference is held and the + * use count for the regulator will be initialised to reflect the current + * state of the regulator. * * This is intended for use by consumers which cannot tolerate shared * use of the regulator such as those which need to force the @@ -1228,35 +1455,52 @@ EXPORT_SYMBOL_GPL(regulator_get); */ struct regulator *regulator_get_exclusive(struct device *dev, const char *id) { - return _regulator_get(dev, id, 1); + return _regulator_get(dev, id, true, false); } EXPORT_SYMBOL_GPL(regulator_get_exclusive); /** - * regulator_put - "free" the regulator source - * @regulator: regulator source + * regulator_get_optional - obtain optional access to a regulator. + * @dev: device for regulator "consumer" + * @id: Supply name or regulator ID. * - * Note: drivers must ensure that all regulator_enable calls made on this - * regulator source are balanced by regulator_disable calls prior to calling - * this function. + * Returns a struct regulator corresponding to the regulator producer, + * or IS_ERR() condition containing errno. + * + * This is intended for use by consumers for devices which can have + * some supplies unconnected in normal use, such as some MMC devices. + * It can allow the regulator core to provide stub supplies for other + * supplies requested using normal regulator_get() calls without + * disrupting the operation of drivers that can handle absent + * supplies. + * + * Use of supply names configured via regulator_set_device_supply() is + * strongly encouraged. It is recommended that the supply name used + * should match the name used for the supply and/or the relevant + * device pins in the datasheet. */ -void regulator_put(struct regulator *regulator) +struct regulator *regulator_get_optional(struct device *dev, const char *id) +{ + return _regulator_get(dev, id, false, false); +} +EXPORT_SYMBOL_GPL(regulator_get_optional); + +/* Locks held by regulator_put() */ +static void _regulator_put(struct regulator *regulator) { struct regulator_dev *rdev; if (regulator == NULL || IS_ERR(regulator)) return; - mutex_lock(®ulator_list_mutex); rdev = regulator->rdev; + debugfs_remove_recursive(regulator->debugfs); + /* remove any sysfs entries */ - if (regulator->dev) { + if (regulator->dev) sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); - kfree(regulator->supply_name); - device_remove_file(regulator->dev, ®ulator->dev_attr); - kfree(regulator->dev_attr.attr.name); - } + kfree(regulator->supply_name); list_del(®ulator->list); kfree(regulator); @@ -1264,38 +1508,328 @@ void regulator_put(struct regulator *regulator) rdev->exclusive = 0; module_put(rdev->owner); +} + +/** + * regulator_put - "free" the regulator source + * @regulator: regulator source + * + * Note: drivers must ensure that all regulator_enable calls made on this + * regulator source are balanced by regulator_disable calls prior to calling + * this function. + */ +void regulator_put(struct regulator *regulator) +{ + mutex_lock(®ulator_list_mutex); + _regulator_put(regulator); mutex_unlock(®ulator_list_mutex); } EXPORT_SYMBOL_GPL(regulator_put); -static int _regulator_can_change_status(struct regulator_dev *rdev) +/** + * regulator_register_supply_alias - Provide device alias for supply lookup + * + * @dev: device that will be given as the regulator "consumer" + * @id: Supply name or regulator ID + * @alias_dev: device that should be used to lookup the supply + * @alias_id: Supply name or regulator ID that should be used to lookup the + * supply + * + * All lookups for id on dev will instead be conducted for alias_id on + * alias_dev. + */ +int regulator_register_supply_alias(struct device *dev, const char *id, + struct device *alias_dev, + const char *alias_id) { - if (!rdev->constraints) - return 0; + struct regulator_supply_alias *map; - if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) - return 1; - else - return 0; + map = regulator_find_supply_alias(dev, id); + if (map) + return -EEXIST; + + map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); + if (!map) + return -ENOMEM; + + map->src_dev = dev; + map->src_supply = id; + map->alias_dev = alias_dev; + map->alias_supply = alias_id; + + list_add(&map->list, ®ulator_supply_alias_list); + + pr_info("Adding alias for supply %s,%s -> %s,%s\n", + id, dev_name(dev), alias_id, dev_name(alias_dev)); + + return 0; } +EXPORT_SYMBOL_GPL(regulator_register_supply_alias); -/* locks held by regulator_enable() */ -static int _regulator_enable(struct regulator_dev *rdev) +/** + * regulator_unregister_supply_alias - Remove device alias + * + * @dev: device that will be given as the regulator "consumer" + * @id: Supply name or regulator ID + * + * Remove a lookup alias if one exists for id on dev. + */ +void regulator_unregister_supply_alias(struct device *dev, const char *id) { - int ret, delay; + struct regulator_supply_alias *map; - if (rdev->use_count == 0) { - /* do we need to enable the supply regulator first */ - if (rdev->supply) { - mutex_lock(&rdev->supply->mutex); - ret = _regulator_enable(rdev->supply); - mutex_unlock(&rdev->supply->mutex); - if (ret < 0) { - rdev_err(rdev, "failed to enable: %d\n", ret); - return ret; + map = regulator_find_supply_alias(dev, id); + if (map) { + list_del(&map->list); + kfree(map); + } +} +EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); + +/** + * regulator_bulk_register_supply_alias - register multiple aliases + * + * @dev: device that will be given as the regulator "consumer" + * @id: List of supply names or regulator IDs + * @alias_dev: device that should be used to lookup the supply + * @alias_id: List of supply names or regulator IDs that should be used to + * lookup the supply + * @num_id: Number of aliases to register + * + * @return 0 on success, an errno on failure. + * + * This helper function allows drivers to register several supply + * aliases in one operation. If any of the aliases cannot be + * registered any aliases that were registered will be removed + * before returning to the caller. + */ +int regulator_bulk_register_supply_alias(struct device *dev, + const char *const *id, + struct device *alias_dev, + const char *const *alias_id, + int num_id) +{ + int i; + int ret; + + for (i = 0; i < num_id; ++i) { + ret = regulator_register_supply_alias(dev, id[i], alias_dev, + alias_id[i]); + if (ret < 0) + goto err; + } + + return 0; + +err: + dev_err(dev, + "Failed to create supply alias %s,%s -> %s,%s\n", + id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); + + while (--i >= 0) + regulator_unregister_supply_alias(dev, id[i]); + + return ret; +} +EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); + +/** + * regulator_bulk_unregister_supply_alias - unregister multiple aliases + * + * @dev: device that will be given as the regulator "consumer" + * @id: List of supply names or regulator IDs + * @num_id: Number of aliases to unregister + * + * This helper function allows drivers to unregister several supply + * aliases in one operation. + */ +void regulator_bulk_unregister_supply_alias(struct device *dev, + const char *const *id, + int num_id) +{ + int i; + + for (i = 0; i < num_id; ++i) + regulator_unregister_supply_alias(dev, id[i]); +} +EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); + + +/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ +static int regulator_ena_gpio_request(struct regulator_dev *rdev, + const struct regulator_config *config) +{ + struct regulator_enable_gpio *pin; + int ret; + + list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { + if (pin->gpio == config->ena_gpio) { + rdev_dbg(rdev, "GPIO %d is already used\n", + config->ena_gpio); + goto update_ena_gpio_to_rdev; + } + } + + ret = gpio_request_one(config->ena_gpio, + GPIOF_DIR_OUT | config->ena_gpio_flags, + rdev_get_name(rdev)); + if (ret) + return ret; + + pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); + if (pin == NULL) { + gpio_free(config->ena_gpio); + return -ENOMEM; + } + + pin->gpio = config->ena_gpio; + pin->ena_gpio_invert = config->ena_gpio_invert; + list_add(&pin->list, ®ulator_ena_gpio_list); + +update_ena_gpio_to_rdev: + pin->request_count++; + rdev->ena_pin = pin; + return 0; +} + +static void regulator_ena_gpio_free(struct regulator_dev *rdev) +{ + struct regulator_enable_gpio *pin, *n; + + if (!rdev->ena_pin) + return; + + /* Free the GPIO only in case of no use */ + list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { + if (pin->gpio == rdev->ena_pin->gpio) { + if (pin->request_count <= 1) { + pin->request_count = 0; + gpio_free(pin->gpio); + list_del(&pin->list); + kfree(pin); + } else { + pin->request_count--; } } } +} + +/** + * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control + * @rdev: regulator_dev structure + * @enable: enable GPIO at initial use? + * + * GPIO is enabled in case of initial use. (enable_count is 0) + * GPIO is disabled when it is not shared any more. (enable_count <= 1) + */ +static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) +{ + struct regulator_enable_gpio *pin = rdev->ena_pin; + + if (!pin) + return -EINVAL; + + if (enable) { + /* Enable GPIO at initial use */ + if (pin->enable_count == 0) + gpio_set_value_cansleep(pin->gpio, + !pin->ena_gpio_invert); + + pin->enable_count++; + } else { + if (pin->enable_count > 1) { + pin->enable_count--; + return 0; + } + + /* Disable GPIO if not used */ + if (pin->enable_count <= 1) { + gpio_set_value_cansleep(pin->gpio, + pin->ena_gpio_invert); + pin->enable_count = 0; + } + } + + return 0; +} + +static int _regulator_do_enable(struct regulator_dev *rdev) +{ + int ret, delay; + + /* Query before enabling in case configuration dependent. */ + ret = _regulator_get_enable_time(rdev); + if (ret >= 0) { + delay = ret; + } else { + rdev_warn(rdev, "enable_time() failed: %d\n", ret); + delay = 0; + } + + trace_regulator_enable(rdev_get_name(rdev)); + + if (rdev->ena_pin) { + ret = regulator_ena_gpio_ctrl(rdev, true); + if (ret < 0) + return ret; + rdev->ena_gpio_state = 1; + } else if (rdev->desc->ops->enable) { + ret = rdev->desc->ops->enable(rdev); + if (ret < 0) + return ret; + } else { + return -EINVAL; + } + + /* Allow the regulator to ramp; it would be useful to extend + * this for bulk operations so that the regulators can ramp + * together. */ + trace_regulator_enable_delay(rdev_get_name(rdev)); + + /* + * Delay for the requested amount of time as per the guidelines in: + * + * Documentation/timers/timers-howto.txt + * + * The assumption here is that regulators will never be enabled in + * atomic context and therefore sleeping functions can be used. + */ + if (delay) { + unsigned int ms = delay / 1000; + unsigned int us = delay % 1000; + + if (ms > 0) { + /* + * For small enough values, handle super-millisecond + * delays in the usleep_range() call below. + */ + if (ms < 20) + us += ms * 1000; + else + msleep(ms); + } + + /* + * Give the scheduler some room to coalesce with any other + * wakeup sources. For delays shorter than 10 us, don't even + * bother setting up high-resolution timers and just busy- + * loop. + */ + if (us >= 10) + usleep_range(us, us + 100); + else + udelay(us); + } + + trace_regulator_enable_complete(rdev_get_name(rdev)); + + return 0; +} + +/* locks held by regulator_enable() */ +static int _regulator_enable(struct regulator_dev *rdev) +{ + int ret; /* check voltage and requested load before enabling */ if (rdev->constraints && @@ -1309,40 +1843,10 @@ static int _regulator_enable(struct regulator_dev *rdev) if (!_regulator_can_change_status(rdev)) return -EPERM; - if (!rdev->desc->ops->enable) - return -EINVAL; - - /* Query before enabling in case configuration - * dependant. */ - ret = _regulator_get_enable_time(rdev); - if (ret >= 0) { - delay = ret; - } else { - rdev_warn(rdev, "enable_time() failed: %d\n", - ret); - delay = 0; - } - - trace_regulator_enable(rdev_get_name(rdev)); - - /* Allow the regulator to ramp; it would be useful - * to extend this for bulk operations so that the - * regulators can ramp together. */ - ret = rdev->desc->ops->enable(rdev); + ret = _regulator_do_enable(rdev); if (ret < 0) return ret; - trace_regulator_enable_delay(rdev_get_name(rdev)); - - if (delay >= 1000) { - mdelay(delay / 1000); - udelay(delay % 1000); - } else if (delay) { - udelay(delay); - } - - trace_regulator_enable_complete(rdev_get_name(rdev)); - } else if (ret < 0) { rdev_err(rdev, "is_enabled() failed: %d\n", ret); return ret; @@ -1371,19 +1875,53 @@ int regulator_enable(struct regulator *regulator) struct regulator_dev *rdev = regulator->rdev; int ret = 0; + if (regulator->always_on) + return 0; + + if (rdev->supply) { + ret = regulator_enable(rdev->supply); + if (ret != 0) + return ret; + } + mutex_lock(&rdev->mutex); ret = _regulator_enable(rdev); mutex_unlock(&rdev->mutex); + + if (ret != 0 && rdev->supply) + regulator_disable(rdev->supply); + return ret; } EXPORT_SYMBOL_GPL(regulator_enable); +static int _regulator_do_disable(struct regulator_dev *rdev) +{ + int ret; + + trace_regulator_disable(rdev_get_name(rdev)); + + if (rdev->ena_pin) { + ret = regulator_ena_gpio_ctrl(rdev, false); + if (ret < 0) + return ret; + rdev->ena_gpio_state = 0; + + } else if (rdev->desc->ops->disable) { + ret = rdev->desc->ops->disable(rdev); + if (ret != 0) + return ret; + } + + trace_regulator_disable_complete(rdev_get_name(rdev)); + + return 0; +} + /* locks held by regulator_disable() */ -static int _regulator_disable(struct regulator_dev *rdev, - struct regulator_dev **supply_rdev_ptr) +static int _regulator_disable(struct regulator_dev *rdev) { int ret = 0; - *supply_rdev_ptr = NULL; if (WARN(rdev->use_count <= 0, "unbalanced disables for %s\n", rdev_get_name(rdev))) @@ -1394,25 +1932,16 @@ static int _regulator_disable(struct regulator_dev *rdev, (rdev->constraints && !rdev->constraints->always_on)) { /* we are last user */ - if (_regulator_can_change_status(rdev) && - rdev->desc->ops->disable) { - trace_regulator_disable(rdev_get_name(rdev)); - - ret = rdev->desc->ops->disable(rdev); + if (_regulator_can_change_status(rdev)) { + ret = _regulator_do_disable(rdev); if (ret < 0) { rdev_err(rdev, "failed to disable\n"); return ret; } - - trace_regulator_disable_complete(rdev_get_name(rdev)); - _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, - NULL); + NULL); } - /* decrease our supplies ref count and disable if required */ - *supply_rdev_ptr = rdev->supply; - rdev->use_count = 0; } else if (rdev->use_count > 1) { @@ -1423,6 +1952,7 @@ static int _regulator_disable(struct regulator_dev *rdev, rdev->use_count--; } + return ret; } @@ -1441,50 +1971,37 @@ static int _regulator_disable(struct regulator_dev *rdev, int regulator_disable(struct regulator *regulator) { struct regulator_dev *rdev = regulator->rdev; - struct regulator_dev *supply_rdev = NULL; int ret = 0; + if (regulator->always_on) + return 0; + mutex_lock(&rdev->mutex); - ret = _regulator_disable(rdev, &supply_rdev); + ret = _regulator_disable(rdev); mutex_unlock(&rdev->mutex); - /* decrease our supplies ref count and disable if required */ - while (supply_rdev != NULL) { - rdev = supply_rdev; - - mutex_lock(&rdev->mutex); - _regulator_disable(rdev, &supply_rdev); - mutex_unlock(&rdev->mutex); - } + if (ret == 0 && rdev->supply) + regulator_disable(rdev->supply); return ret; } EXPORT_SYMBOL_GPL(regulator_disable); /* locks held by regulator_force_disable() */ -static int _regulator_force_disable(struct regulator_dev *rdev, - struct regulator_dev **supply_rdev_ptr) +static int _regulator_force_disable(struct regulator_dev *rdev) { int ret = 0; - /* force disable */ - if (rdev->desc->ops->disable) { - /* ah well, who wants to live forever... */ - ret = rdev->desc->ops->disable(rdev); - if (ret < 0) { - rdev_err(rdev, "failed to force disable\n"); - return ret; - } - /* notify other consumers that power has been forced off */ - _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | - REGULATOR_EVENT_DISABLE, NULL); + ret = _regulator_do_disable(rdev); + if (ret < 0) { + rdev_err(rdev, "failed to force disable\n"); + return ret; } - /* decrease our supplies ref count and disable if required */ - *supply_rdev_ptr = rdev->supply; + _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | + REGULATOR_EVENT_DISABLE, NULL); - rdev->use_count = 0; - return ret; + return 0; } /** @@ -1498,23 +2015,97 @@ static int _regulator_force_disable(struct regulator_dev *rdev, */ int regulator_force_disable(struct regulator *regulator) { - struct regulator_dev *supply_rdev = NULL; + struct regulator_dev *rdev = regulator->rdev; int ret; - mutex_lock(®ulator->rdev->mutex); + mutex_lock(&rdev->mutex); regulator->uA_load = 0; - ret = _regulator_force_disable(regulator->rdev, &supply_rdev); - mutex_unlock(®ulator->rdev->mutex); + ret = _regulator_force_disable(regulator->rdev); + mutex_unlock(&rdev->mutex); - if (supply_rdev) - regulator_disable(get_device_regulator(rdev_get_dev(supply_rdev))); + if (rdev->supply) + while (rdev->open_count--) + regulator_disable(rdev->supply); return ret; } EXPORT_SYMBOL_GPL(regulator_force_disable); +static void regulator_disable_work(struct work_struct *work) +{ + struct regulator_dev *rdev = container_of(work, struct regulator_dev, + disable_work.work); + int count, i, ret; + + mutex_lock(&rdev->mutex); + + BUG_ON(!rdev->deferred_disables); + + count = rdev->deferred_disables; + rdev->deferred_disables = 0; + + for (i = 0; i < count; i++) { + ret = _regulator_disable(rdev); + if (ret != 0) + rdev_err(rdev, "Deferred disable failed: %d\n", ret); + } + + mutex_unlock(&rdev->mutex); + + if (rdev->supply) { + for (i = 0; i < count; i++) { + ret = regulator_disable(rdev->supply); + if (ret != 0) { + rdev_err(rdev, + "Supply disable failed: %d\n", ret); + } + } + } +} + +/** + * regulator_disable_deferred - disable regulator output with delay + * @regulator: regulator source + * @ms: miliseconds until the regulator is disabled + * + * Execute regulator_disable() on the regulator after a delay. This + * is intended for use with devices that require some time to quiesce. + * + * NOTE: this will only disable the regulator output if no other consumer + * devices have it enabled, the regulator device supports disabling and + * machine constraints permit this operation. + */ +int regulator_disable_deferred(struct regulator *regulator, int ms) +{ + struct regulator_dev *rdev = regulator->rdev; + int ret; + + if (regulator->always_on) + return 0; + + if (!ms) + return regulator_disable(regulator); + + mutex_lock(&rdev->mutex); + rdev->deferred_disables++; + mutex_unlock(&rdev->mutex); + + ret = queue_delayed_work(system_power_efficient_wq, + &rdev->disable_work, + msecs_to_jiffies(ms)); + if (ret < 0) + return ret; + else + return 0; +} +EXPORT_SYMBOL_GPL(regulator_disable_deferred); + static int _regulator_is_enabled(struct regulator_dev *rdev) { + /* A GPIO control always takes precedence */ + if (rdev->ena_pin) + return rdev->ena_gpio_state; + /* If we don't know then assume that the regulator is always on */ if (!rdev->desc->ops->is_enabled) return 1; @@ -1538,6 +2129,9 @@ int regulator_is_enabled(struct regulator *regulator) { int ret; + if (regulator->always_on) + return 1; + mutex_lock(®ulator->rdev->mutex); ret = _regulator_is_enabled(regulator->rdev); mutex_unlock(®ulator->rdev->mutex); @@ -1547,6 +2141,34 @@ int regulator_is_enabled(struct regulator *regulator) EXPORT_SYMBOL_GPL(regulator_is_enabled); /** + * regulator_can_change_voltage - check if regulator can change voltage + * @regulator: regulator source + * + * Returns positive if the regulator driver backing the source/client + * can change its voltage, false otherwise. Useful for detecting fixed + * or dummy regulators and disabling voltage change logic in the client + * driver. + */ +int regulator_can_change_voltage(struct regulator *regulator) +{ + struct regulator_dev *rdev = regulator->rdev; + + if (rdev->constraints && + (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { + if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) + return 1; + + if (rdev->desc->continuous_voltage_range && + rdev->constraints->min_uV && rdev->constraints->max_uV && + rdev->constraints->min_uV != rdev->constraints->max_uV) + return 1; + } + + return 0; +} +EXPORT_SYMBOL_GPL(regulator_can_change_voltage); + +/** * regulator_count_voltages - count regulator_list_voltage() selectors * @regulator: regulator source * @@ -1578,6 +2200,9 @@ int regulator_list_voltage(struct regulator *regulator, unsigned selector) struct regulator_ops *ops = rdev->desc->ops; int ret; + if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) + return rdev->desc->fixed_uV; + if (!ops->list_voltage || selector >= rdev->desc->n_voltages) return -EINVAL; @@ -1597,6 +2222,21 @@ int regulator_list_voltage(struct regulator *regulator, unsigned selector) EXPORT_SYMBOL_GPL(regulator_list_voltage); /** + * regulator_get_linear_step - return the voltage step size between VSEL values + * @regulator: regulator source + * + * Returns the voltage step size between VSEL values for linear + * regulators, or return 0 if the regulator isn't a linear regulator. + */ +unsigned int regulator_get_linear_step(struct regulator *regulator) +{ + struct regulator_dev *rdev = regulator->rdev; + + return rdev->desc->uV_step; +} +EXPORT_SYMBOL_GPL(regulator_get_linear_step); + +/** * regulator_is_supported_voltage - check if a voltage range can be supported * * @regulator: Regulator to check. @@ -1608,8 +2248,23 @@ EXPORT_SYMBOL_GPL(regulator_list_voltage); int regulator_is_supported_voltage(struct regulator *regulator, int min_uV, int max_uV) { + struct regulator_dev *rdev = regulator->rdev; int i, voltages, ret; + /* If we can't change voltage check the current voltage */ + if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { + ret = regulator_get_voltage(regulator); + if (ret >= 0) + return min_uV <= ret && ret <= max_uV; + else + return ret; + } + + /* Any voltage within constrains range is fine? */ + if (rdev->desc->continuous_voltage_range) + return min_uV >= rdev->constraints->min_uV && + max_uV <= rdev->constraints->max_uV; + ret = regulator_count_voltages(regulator); if (ret < 0) return ret; @@ -1624,59 +2279,110 @@ int regulator_is_supported_voltage(struct regulator *regulator, return 0; } +EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); static int _regulator_do_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV) { int ret; + int delay = 0; + int best_val = 0; unsigned int selector; + int old_selector = -1; trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); + min_uV += rdev->constraints->uV_offset; + max_uV += rdev->constraints->uV_offset; + + /* + * If we can't obtain the old selector there is not enough + * info to call set_voltage_time_sel(). + */ + if (_regulator_is_enabled(rdev) && + rdev->desc->ops->set_voltage_time_sel && + rdev->desc->ops->get_voltage_sel) { + old_selector = rdev->desc->ops->get_voltage_sel(rdev); + if (old_selector < 0) + return old_selector; + } + if (rdev->desc->ops->set_voltage) { ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, &selector); - if (rdev->desc->ops->list_voltage) - selector = rdev->desc->ops->list_voltage(rdev, - selector); - else - selector = -1; + if (ret >= 0) { + if (rdev->desc->ops->list_voltage) + best_val = rdev->desc->ops->list_voltage(rdev, + selector); + else + best_val = _regulator_get_voltage(rdev); + } + } else if (rdev->desc->ops->set_voltage_sel) { - int best_val = INT_MAX; - int i; + if (rdev->desc->ops->map_voltage) { + ret = rdev->desc->ops->map_voltage(rdev, min_uV, + max_uV); + } else { + if (rdev->desc->ops->list_voltage == + regulator_list_voltage_linear) + ret = regulator_map_voltage_linear(rdev, + min_uV, max_uV); + else if (rdev->desc->ops->list_voltage == + regulator_list_voltage_linear_range) + ret = regulator_map_voltage_linear_range(rdev, + min_uV, max_uV); + else + ret = regulator_map_voltage_iterate(rdev, + min_uV, max_uV); + } - selector = 0; + if (ret >= 0) { + best_val = rdev->desc->ops->list_voltage(rdev, ret); + if (min_uV <= best_val && max_uV >= best_val) { + selector = ret; + if (old_selector == selector) + ret = 0; + else + ret = rdev->desc->ops->set_voltage_sel( + rdev, ret); + } else { + ret = -EINVAL; + } + } + } else { + ret = -EINVAL; + } - /* Find the smallest voltage that falls within the specified - * range. - */ - for (i = 0; i < rdev->desc->n_voltages; i++) { - ret = rdev->desc->ops->list_voltage(rdev, i); - if (ret < 0) - continue; + /* Call set_voltage_time_sel if successfully obtained old_selector */ + if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 + && old_selector != selector) { - if (ret < best_val && ret >= min_uV && ret <= max_uV) { - best_val = ret; - selector = i; - } + delay = rdev->desc->ops->set_voltage_time_sel(rdev, + old_selector, selector); + if (delay < 0) { + rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", + delay); + delay = 0; } - if (best_val != INT_MAX) { - ret = rdev->desc->ops->set_voltage_sel(rdev, selector); - selector = best_val; - } else { - ret = -EINVAL; + /* Insert any necessary delays */ + if (delay >= 1000) { + mdelay(delay / 1000); + udelay(delay % 1000); + } else if (delay) { + udelay(delay); } - } else { - ret = -EINVAL; } - if (ret == 0) + if (ret == 0 && best_val >= 0) { + unsigned long data = best_val; + _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, - NULL); + (void *)data); + } - trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); + trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); return ret; } @@ -1703,6 +2409,8 @@ int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) { struct regulator_dev *rdev = regulator->rdev; int ret = 0; + int old_min_uV, old_max_uV; + int current_uV; mutex_lock(&rdev->mutex); @@ -1713,6 +2421,19 @@ int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) goto out; + /* If we're trying to set a range that overlaps the current voltage, + * return succesfully even though the regulator does not support + * changing the voltage. + */ + if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { + current_uV = _regulator_get_voltage(rdev); + if (min_uV <= current_uV && current_uV <= max_uV) { + regulator->min_uV = min_uV; + regulator->max_uV = max_uV; + goto out; + } + } + /* sanity check */ if (!rdev->desc->ops->set_voltage && !rdev->desc->ops->set_voltage_sel) { @@ -1724,22 +2445,118 @@ int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) ret = regulator_check_voltage(rdev, &min_uV, &max_uV); if (ret < 0) goto out; + + /* restore original values in case of error */ + old_min_uV = regulator->min_uV; + old_max_uV = regulator->max_uV; regulator->min_uV = min_uV; regulator->max_uV = max_uV; ret = regulator_check_consumers(rdev, &min_uV, &max_uV); if (ret < 0) - goto out; + goto out2; ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); + if (ret < 0) + goto out2; out: mutex_unlock(&rdev->mutex); return ret; +out2: + regulator->min_uV = old_min_uV; + regulator->max_uV = old_max_uV; + mutex_unlock(&rdev->mutex); + return ret; } EXPORT_SYMBOL_GPL(regulator_set_voltage); /** + * regulator_set_voltage_time - get raise/fall time + * @regulator: regulator source + * @old_uV: starting voltage in microvolts + * @new_uV: target voltage in microvolts + * + * Provided with the starting and ending voltage, this function attempts to + * calculate the time in microseconds required to rise or fall to this new + * voltage. + */ +int regulator_set_voltage_time(struct regulator *regulator, + int old_uV, int new_uV) +{ + struct regulator_dev *rdev = regulator->rdev; + struct regulator_ops *ops = rdev->desc->ops; + int old_sel = -1; + int new_sel = -1; + int voltage; + int i; + + /* Currently requires operations to do this */ + if (!ops->list_voltage || !ops->set_voltage_time_sel + || !rdev->desc->n_voltages) + return -EINVAL; + + for (i = 0; i < rdev->desc->n_voltages; i++) { + /* We only look for exact voltage matches here */ + voltage = regulator_list_voltage(regulator, i); + if (voltage < 0) + return -EINVAL; + if (voltage == 0) + continue; + if (voltage == old_uV) + old_sel = i; + if (voltage == new_uV) + new_sel = i; + } + + if (old_sel < 0 || new_sel < 0) + return -EINVAL; + + return ops->set_voltage_time_sel(rdev, old_sel, new_sel); +} +EXPORT_SYMBOL_GPL(regulator_set_voltage_time); + +/** + * regulator_set_voltage_time_sel - get raise/fall time + * @rdev: regulator source device + * @old_selector: selector for starting voltage + * @new_selector: selector for target voltage + * + * Provided with the starting and target voltage selectors, this function + * returns time in microseconds required to rise or fall to this new voltage + * + * Drivers providing ramp_delay in regulation_constraints can use this as their + * set_voltage_time_sel() operation. + */ +int regulator_set_voltage_time_sel(struct regulator_dev *rdev, + unsigned int old_selector, + unsigned int new_selector) +{ + unsigned int ramp_delay = 0; + int old_volt, new_volt; + + if (rdev->constraints->ramp_delay) + ramp_delay = rdev->constraints->ramp_delay; + else if (rdev->desc->ramp_delay) + ramp_delay = rdev->desc->ramp_delay; + + if (ramp_delay == 0) { + rdev_warn(rdev, "ramp_delay not set\n"); + return 0; + } + + /* sanity check */ + if (!rdev->desc->ops->list_voltage) + return -EINVAL; + + old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); + new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); + + return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); +} +EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); + +/** * regulator_sync_voltage - re-apply last regulator output voltage * @regulator: regulator source * @@ -1788,18 +2605,26 @@ EXPORT_SYMBOL_GPL(regulator_sync_voltage); static int _regulator_get_voltage(struct regulator_dev *rdev) { - int sel; + int sel, ret; if (rdev->desc->ops->get_voltage_sel) { sel = rdev->desc->ops->get_voltage_sel(rdev); if (sel < 0) return sel; - return rdev->desc->ops->list_voltage(rdev, sel); - } - if (rdev->desc->ops->get_voltage) - return rdev->desc->ops->get_voltage(rdev); - else + ret = rdev->desc->ops->list_voltage(rdev, sel); + } else if (rdev->desc->ops->get_voltage) { + ret = rdev->desc->ops->get_voltage(rdev); + } else if (rdev->desc->ops->list_voltage) { + ret = rdev->desc->ops->list_voltage(rdev, 0); + } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { + ret = rdev->desc->fixed_uV; + } else { return -EINVAL; + } + + if (ret < 0) + return ret; + return ret - rdev->constraints->uV_offset; } /** @@ -1828,7 +2653,7 @@ EXPORT_SYMBOL_GPL(regulator_get_voltage); /** * regulator_set_current_limit - set regulator output current limit * @regulator: regulator source - * @min_uA: Minimuum supported current in uA + * @min_uA: Minimum supported current in uA * @max_uA: Maximum supported current in uA * * Sets current sink to the desired output current. This can be set during @@ -1935,7 +2760,7 @@ int regulator_set_mode(struct regulator *regulator, unsigned int mode) } /* constraints check */ - ret = regulator_check_mode(rdev, mode); + ret = regulator_mode_constrain(rdev, &mode); if (ret < 0) goto out; @@ -2006,21 +2831,37 @@ int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) { struct regulator_dev *rdev = regulator->rdev; struct regulator *consumer; - int ret, output_uV, input_uV, total_uA_load = 0; + int ret, output_uV, input_uV = 0, total_uA_load = 0; unsigned int mode; + if (rdev->supply) + input_uV = regulator_get_voltage(rdev->supply); + mutex_lock(&rdev->mutex); + /* + * first check to see if we can set modes at all, otherwise just + * tell the consumer everything is OK. + */ regulator->uA_load = uA_load; ret = regulator_check_drms(rdev); - if (ret < 0) + if (ret < 0) { + ret = 0; goto out; - ret = -EINVAL; + } - /* sanity check */ if (!rdev->desc->ops->get_optimum_mode) goto out; + /* + * we can actually do this so any errors are indicators of + * potential real failure. + */ + ret = -EINVAL; + + if (!rdev->desc->ops->set_mode) + goto out; + /* get output voltage */ output_uV = _regulator_get_voltage(rdev); if (output_uV <= 0) { @@ -2028,10 +2869,7 @@ int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) goto out; } - /* get input voltage */ - input_uV = 0; - if (rdev->supply) - input_uV = _regulator_get_voltage(rdev->supply); + /* No supply? Use constraint voltage */ if (input_uV <= 0) input_uV = rdev->constraints->input_uV; if (input_uV <= 0) { @@ -2046,7 +2884,7 @@ int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, output_uV, total_uA_load); - ret = regulator_check_mode(rdev, mode); + ret = regulator_mode_constrain(rdev, &mode); if (ret < 0) { rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", total_uA_load, input_uV, output_uV); @@ -2066,6 +2904,59 @@ out: EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); /** + * regulator_allow_bypass - allow the regulator to go into bypass mode + * + * @regulator: Regulator to configure + * @enable: enable or disable bypass mode + * + * Allow the regulator to go into bypass mode if all other consumers + * for the regulator also enable bypass mode and the machine + * constraints allow this. Bypass mode means that the regulator is + * simply passing the input directly to the output with no regulation. + */ +int regulator_allow_bypass(struct regulator *regulator, bool enable) +{ + struct regulator_dev *rdev = regulator->rdev; + int ret = 0; + + if (!rdev->desc->ops->set_bypass) + return 0; + + if (rdev->constraints && + !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) + return 0; + + mutex_lock(&rdev->mutex); + + if (enable && !regulator->bypass) { + rdev->bypass_count++; + + if (rdev->bypass_count == rdev->open_count) { + ret = rdev->desc->ops->set_bypass(rdev, enable); + if (ret != 0) + rdev->bypass_count--; + } + + } else if (!enable && regulator->bypass) { + rdev->bypass_count--; + + if (rdev->bypass_count != rdev->open_count) { + ret = rdev->desc->ops->set_bypass(rdev, enable); + if (ret != 0) + rdev->bypass_count++; + } + } + + if (ret == 0) + regulator->bypass = enable; + + mutex_unlock(&rdev->mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(regulator_allow_bypass); + +/** * regulator_register_notifier - register regulator event notifier * @regulator: regulator source * @nb: notifier block @@ -2101,17 +2992,8 @@ EXPORT_SYMBOL_GPL(regulator_unregister_notifier); static void _notifier_call_chain(struct regulator_dev *rdev, unsigned long event, void *data) { - struct regulator_dev *_rdev; - /* call rdev chain first */ - blocking_notifier_call_chain(&rdev->notifier, event, NULL); - - /* now notify regulator we supply */ - list_for_each_entry(_rdev, &rdev->supply_list, slist) { - mutex_lock(&_rdev->mutex); - _notifier_call_chain(_rdev, event, data); - mutex_unlock(&_rdev->mutex); - } + blocking_notifier_call_chain(&rdev->notifier, event, data); } /** @@ -2152,13 +3034,20 @@ int regulator_bulk_get(struct device *dev, int num_consumers, return 0; err: - for (i = 0; i < num_consumers && consumers[i].consumer; i++) + while (--i >= 0) regulator_put(consumers[i].consumer); return ret; } EXPORT_SYMBOL_GPL(regulator_bulk_get); +static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) +{ + struct regulator_bulk_data *bulk = data; + + bulk->ret = regulator_enable(bulk->consumer); +} + /** * regulator_bulk_enable - enable multiple regulator consumers * @@ -2174,21 +3063,38 @@ EXPORT_SYMBOL_GPL(regulator_bulk_get); int regulator_bulk_enable(int num_consumers, struct regulator_bulk_data *consumers) { + ASYNC_DOMAIN_EXCLUSIVE(async_domain); int i; - int ret; + int ret = 0; for (i = 0; i < num_consumers; i++) { - ret = regulator_enable(consumers[i].consumer); - if (ret != 0) + if (consumers[i].consumer->always_on) + consumers[i].ret = 0; + else + async_schedule_domain(regulator_bulk_enable_async, + &consumers[i], &async_domain); + } + + async_synchronize_full_domain(&async_domain); + + /* If any consumer failed we need to unwind any that succeeded */ + for (i = 0; i < num_consumers; i++) { + if (consumers[i].ret != 0) { + ret = consumers[i].ret; goto err; + } } return 0; err: - pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); - for (--i; i >= 0; --i) - regulator_disable(consumers[i].consumer); + for (i = 0; i < num_consumers; i++) { + if (consumers[i].ret < 0) + pr_err("Failed to enable %s: %d\n", consumers[i].supply, + consumers[i].ret); + else + regulator_disable(consumers[i].consumer); + } return ret; } @@ -2202,17 +3108,17 @@ EXPORT_SYMBOL_GPL(regulator_bulk_enable); * @return 0 on success, an errno on failure * * This convenience API allows consumers to disable multiple regulator - * clients in a single API call. If any consumers cannot be enabled - * then any others that were disabled will be disabled again prior to + * clients in a single API call. If any consumers cannot be disabled + * then any others that were disabled will be enabled again prior to * return. */ int regulator_bulk_disable(int num_consumers, struct regulator_bulk_data *consumers) { int i; - int ret; + int ret, r; - for (i = 0; i < num_consumers; i++) { + for (i = num_consumers - 1; i >= 0; --i) { ret = regulator_disable(consumers[i].consumer); if (ret != 0) goto err; @@ -2222,14 +3128,55 @@ int regulator_bulk_disable(int num_consumers, err: pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); - for (--i; i >= 0; --i) - regulator_enable(consumers[i].consumer); + for (++i; i < num_consumers; ++i) { + r = regulator_enable(consumers[i].consumer); + if (r != 0) + pr_err("Failed to reename %s: %d\n", + consumers[i].supply, r); + } return ret; } EXPORT_SYMBOL_GPL(regulator_bulk_disable); /** + * regulator_bulk_force_disable - force disable multiple regulator consumers + * + * @num_consumers: Number of consumers + * @consumers: Consumer data; clients are stored here. + * @return 0 on success, an errno on failure + * + * This convenience API allows consumers to forcibly disable multiple regulator + * clients in a single API call. + * NOTE: This should be used for situations when device damage will + * likely occur if the regulators are not disabled (e.g. over temp). + * Although regulator_force_disable function call for some consumers can + * return error numbers, the function is called for all consumers. + */ +int regulator_bulk_force_disable(int num_consumers, + struct regulator_bulk_data *consumers) +{ + int i; + int ret; + + for (i = 0; i < num_consumers; i++) + consumers[i].ret = + regulator_force_disable(consumers[i].consumer); + + for (i = 0; i < num_consumers; i++) { + if (consumers[i].ret != 0) { + ret = consumers[i].ret; + goto out; + } + } + + return 0; +out: + return ret; +} +EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); + +/** * regulator_bulk_free - free multiple regulator consumers * * @num_consumers: Number of consumers @@ -2285,10 +3232,10 @@ int regulator_mode_to_status(unsigned int mode) return REGULATOR_STATUS_NORMAL; case REGULATOR_MODE_IDLE: return REGULATOR_STATUS_IDLE; - case REGULATOR_STATUS_STANDBY: + case REGULATOR_MODE_STANDBY: return REGULATOR_STATUS_STANDBY; default: - return 0; + return REGULATOR_STATUS_UNDEFINED; } } EXPORT_SYMBOL_GPL(regulator_mode_to_status); @@ -2304,7 +3251,10 @@ static int add_regulator_attributes(struct regulator_dev *rdev) int status = 0; /* some attributes need specific methods to be displayed */ - if (ops->get_voltage || ops->get_voltage_sel) { + if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || + (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || + (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || + (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1))) { status = device_create_file(dev, &dev_attr_microvolts); if (status < 0) return status; @@ -2319,7 +3269,7 @@ static int add_regulator_attributes(struct regulator_dev *rdev) if (status < 0) return status; } - if (ops->is_enabled) { + if (rdev->ena_pin || ops->is_enabled) { status = device_create_file(dev, &dev_attr_state); if (status < 0) return status; @@ -2329,6 +3279,11 @@ static int add_regulator_attributes(struct regulator_dev *rdev) if (status < 0) return status; } + if (ops->get_bypass) { + status = device_create_file(dev, &dev_attr_bypass); + if (status < 0) + return status; + } /* some attributes are type-specific */ if (rdev->desc->type == REGULATOR_CURRENT) { @@ -2362,10 +3317,6 @@ static int add_regulator_attributes(struct regulator_dev *rdev) return status; } - /* suspend mode constraints need multiple supporting methods */ - if (!(ops->set_suspend_enable && ops->set_suspend_disable)) - return status; - status = device_create_file(dev, &dev_attr_suspend_standby_state); if (status < 0) return status; @@ -2411,11 +3362,9 @@ static int add_regulator_attributes(struct regulator_dev *rdev) static void rdev_init_debugfs(struct regulator_dev *rdev) { -#ifdef CONFIG_DEBUG_FS rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); - if (IS_ERR(rdev->debugfs) || !rdev->debugfs) { + if (!rdev->debugfs) { rdev_warn(rdev, "Failed to create debugfs directory\n"); - rdev->debugfs = NULL; return; } @@ -2423,30 +3372,37 @@ static void rdev_init_debugfs(struct regulator_dev *rdev) &rdev->use_count); debugfs_create_u32("open_count", 0444, rdev->debugfs, &rdev->open_count); -#endif + debugfs_create_u32("bypass_count", 0444, rdev->debugfs, + &rdev->bypass_count); } /** * regulator_register - register regulator * @regulator_desc: regulator to register - * @dev: struct device for the regulator - * @init_data: platform provided init data, passed through by driver - * @driver_data: private regulator data + * @config: runtime configuration for regulator * * Called by regulator drivers to register a regulator. - * Returns 0 on success. + * Returns a valid pointer to struct regulator_dev on success + * or an ERR_PTR() on error. */ -struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, - struct device *dev, const struct regulator_init_data *init_data, - void *driver_data) +struct regulator_dev * +regulator_register(const struct regulator_desc *regulator_desc, + const struct regulator_config *config) { + const struct regulation_constraints *constraints = NULL; + const struct regulator_init_data *init_data; static atomic_t regulator_no = ATOMIC_INIT(0); struct regulator_dev *rdev; + struct device *dev; int ret, i; + const char *supply = NULL; - if (regulator_desc == NULL) + if (regulator_desc == NULL || config == NULL) return ERR_PTR(-EINVAL); + dev = config->dev; + WARN_ON(!dev); + if (regulator_desc->name == NULL || regulator_desc->ops == NULL) return ERR_PTR(-EINVAL); @@ -2454,9 +3410,6 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, regulator_desc->type != REGULATOR_CURRENT) return ERR_PTR(-EINVAL); - if (!init_data) - return ERR_PTR(-EINVAL); - /* Only one of each should be implemented */ WARN_ON(regulator_desc->ops->get_voltage && regulator_desc->ops->get_voltage_sel); @@ -2473,6 +3426,8 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, return ERR_PTR(-EINVAL); } + init_data = config->init_data; + rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); if (rdev == NULL) return ERR_PTR(-ENOMEM); @@ -2480,17 +3435,22 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, mutex_lock(®ulator_list_mutex); mutex_init(&rdev->mutex); - rdev->reg_data = driver_data; + rdev->reg_data = config->driver_data; rdev->owner = regulator_desc->owner; rdev->desc = regulator_desc; + if (config->regmap) + rdev->regmap = config->regmap; + else if (dev_get_regmap(dev, NULL)) + rdev->regmap = dev_get_regmap(dev, NULL); + else if (dev->parent) + rdev->regmap = dev_get_regmap(dev->parent, NULL); INIT_LIST_HEAD(&rdev->consumer_list); - INIT_LIST_HEAD(&rdev->supply_list); INIT_LIST_HEAD(&rdev->list); - INIT_LIST_HEAD(&rdev->slist); BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); + INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); /* preform any regulator specific init */ - if (init_data->regulator_init) { + if (init_data && init_data->regulator_init) { ret = init_data->regulator_init(rdev->reg_data); if (ret < 0) goto clean; @@ -2498,6 +3458,7 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, /* register with sysfs */ rdev->dev.class = ®ulator_class; + rdev->dev.of_node = of_node_get(config->of_node); rdev->dev.parent = dev; dev_set_name(&rdev->dev, "regulator.%d", atomic_inc_return(®ulator_no) - 1); @@ -2509,8 +3470,26 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, dev_set_drvdata(&rdev->dev, rdev); + if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { + ret = regulator_ena_gpio_request(rdev, config); + if (ret != 0) { + rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", + config->ena_gpio, ret); + goto wash; + } + + if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) + rdev->ena_gpio_state = 1; + + if (config->ena_gpio_invert) + rdev->ena_gpio_state = !rdev->ena_gpio_state; + } + /* set regulator constraints */ - ret = set_machine_constraints(rdev, &init_data->constraints); + if (init_data) + constraints = &init_data->constraints; + + ret = set_machine_constraints(rdev, constraints); if (ret < 0) goto scrub; @@ -2519,54 +3498,54 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, if (ret < 0) goto scrub; - /* set supply regulator if it exists */ - if (init_data->supply_regulator && init_data->supply_regulator_dev) { - dev_err(dev, - "Supply regulator specified by both name and dev\n"); - ret = -EINVAL; - goto scrub; - } + if (init_data && init_data->supply_regulator) + supply = init_data->supply_regulator; + else if (regulator_desc->supply_name) + supply = regulator_desc->supply_name; - if (init_data->supply_regulator) { + if (supply) { struct regulator_dev *r; - int found = 0; - list_for_each_entry(r, ®ulator_list, list) { - if (strcmp(rdev_get_name(r), - init_data->supply_regulator) == 0) { - found = 1; - break; - } - } + r = regulator_dev_lookup(dev, supply, &ret); - if (!found) { - dev_err(dev, "Failed to find supply %s\n", - init_data->supply_regulator); - ret = -ENODEV; + if (ret == -ENODEV) { + /* + * No supply was specified for this regulator and + * there will never be one. + */ + ret = 0; + goto add_dev; + } else if (!r) { + dev_err(dev, "Failed to find supply %s\n", supply); + ret = -EPROBE_DEFER; goto scrub; } ret = set_supply(rdev, r); if (ret < 0) goto scrub; - } - if (init_data->supply_regulator_dev) { - dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n"); - ret = set_supply(rdev, - dev_get_drvdata(init_data->supply_regulator_dev)); - if (ret < 0) - goto scrub; + /* Enable supply if rail is enabled */ + if (_regulator_is_enabled(rdev)) { + ret = regulator_enable(rdev->supply); + if (ret < 0) + goto scrub; + } } +add_dev: /* add consumers devices */ - for (i = 0; i < init_data->num_consumer_supplies; i++) { - ret = set_consumer_device_supply(rdev, - init_data->consumer_supplies[i].dev, - init_data->consumer_supplies[i].dev_name, - init_data->consumer_supplies[i].supply); - if (ret < 0) - goto unset_supplies; + if (init_data) { + for (i = 0; i < init_data->num_consumer_supplies; i++) { + ret = set_consumer_device_supply(rdev, + init_data->consumer_supplies[i].dev_name, + init_data->consumer_supplies[i].supply); + if (ret < 0) { + dev_err(dev, "Failed to set supply %s\n", + init_data->consumer_supplies[i].supply); + goto unset_supplies; + } + } } list_add(&rdev->list, ®ulator_list); @@ -2580,6 +3559,11 @@ unset_supplies: unset_regulator_supplies(rdev); scrub: + if (rdev->supply) + _regulator_put(rdev->supply); + regulator_ena_gpio_free(rdev); + kfree(rdev->constraints); +wash: device_unregister(&rdev->dev); /* device core frees rdev */ rdev = ERR_PTR(ret); @@ -2603,17 +3587,21 @@ void regulator_unregister(struct regulator_dev *rdev) if (rdev == NULL) return; + if (rdev->supply) { + while (rdev->use_count--) + regulator_disable(rdev->supply); + regulator_put(rdev->supply); + } mutex_lock(®ulator_list_mutex); -#ifdef CONFIG_DEBUG_FS debugfs_remove_recursive(rdev->debugfs); -#endif + flush_work(&rdev->disable_work.work); WARN_ON(rdev->open_count); unset_regulator_supplies(rdev); list_del(&rdev->list); - if (rdev->supply) - sysfs_remove_link(&rdev->dev.kobj, "supply"); - device_unregister(&rdev->dev); kfree(rdev->constraints); + regulator_ena_gpio_free(rdev); + of_node_put(rdev->dev.of_node); + device_unregister(&rdev->dev); mutex_unlock(®ulator_list_mutex); } EXPORT_SYMBOL_GPL(regulator_unregister); @@ -2653,6 +3641,42 @@ out: EXPORT_SYMBOL_GPL(regulator_suspend_prepare); /** + * regulator_suspend_finish - resume regulators from system wide suspend + * + * Turn on regulators that might be turned off by regulator_suspend_prepare + * and that should be turned on according to the regulators properties. + */ +int regulator_suspend_finish(void) +{ + struct regulator_dev *rdev; + int ret = 0, error; + + mutex_lock(®ulator_list_mutex); + list_for_each_entry(rdev, ®ulator_list, list) { + mutex_lock(&rdev->mutex); + if (rdev->use_count > 0 || rdev->constraints->always_on) { + error = _regulator_do_enable(rdev); + if (error) + ret = error; + } else { + if (!have_full_constraints()) + goto unlock; + if (!_regulator_is_enabled(rdev)) + goto unlock; + + error = _regulator_do_disable(rdev); + if (error) + ret = error; + } +unlock: + mutex_unlock(&rdev->mutex); + } + mutex_unlock(®ulator_list_mutex); + return ret; +} +EXPORT_SYMBOL_GPL(regulator_suspend_finish); + +/** * regulator_has_full_constraints - the system has fully specified constraints * * Calling this function will cause the regulator API to disable all @@ -2670,22 +3694,6 @@ void regulator_has_full_constraints(void) EXPORT_SYMBOL_GPL(regulator_has_full_constraints); /** - * regulator_use_dummy_regulator - Provide a dummy regulator when none is found - * - * Calling this function will cause the regulator API to provide a - * dummy regulator to consumers if no physical regulator is found, - * allowing most consumers to proceed as though a regulator were - * configured. This allows systems such as those with software - * controllable regulators for the CPU core only to be brought up more - * readily. - */ -void regulator_use_dummy_regulator(void) -{ - board_wants_dummy_regulator = true; -} -EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); - -/** * rdev_get_drvdata - get rdev regulator driver data * @rdev: regulator * @@ -2744,19 +3752,57 @@ void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) } EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); +#ifdef CONFIG_DEBUG_FS +static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, + size_t count, loff_t *ppos) +{ + char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); + ssize_t len, ret = 0; + struct regulator_map *map; + + if (!buf) + return -ENOMEM; + + list_for_each_entry(map, ®ulator_map_list, list) { + len = snprintf(buf + ret, PAGE_SIZE - ret, + "%s -> %s.%s\n", + rdev_get_name(map->regulator), map->dev_name, + map->supply); + if (len >= 0) + ret += len; + if (ret > PAGE_SIZE) { + ret = PAGE_SIZE; + break; + } + } + + ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); + + kfree(buf); + + return ret; +} +#endif + +static const struct file_operations supply_map_fops = { +#ifdef CONFIG_DEBUG_FS + .read = supply_map_read_file, + .llseek = default_llseek, +#endif +}; + static int __init regulator_init(void) { int ret; ret = class_register(®ulator_class); -#ifdef CONFIG_DEBUG_FS debugfs_root = debugfs_create_dir("regulator", NULL); - if (IS_ERR(debugfs_root) || !debugfs_root) { + if (!debugfs_root) pr_warn("regulator: Failed to create debugfs directory\n"); - debugfs_root = NULL; - } -#endif + + debugfs_create_file("supply_map", 0444, debugfs_root, NULL, + &supply_map_fops); regulator_dummy_init(); @@ -2773,17 +3819,30 @@ static int __init regulator_init_complete(void) struct regulation_constraints *c; int enabled, ret; + /* + * Since DT doesn't provide an idiomatic mechanism for + * enabling full constraints and since it's much more natural + * with DT to provide them just assume that a DT enabled + * system has full constraints. + */ + if (of_have_populated_dt()) + has_full_constraints = true; + mutex_lock(®ulator_list_mutex); /* If we have a full configuration then disable any regulators - * which are not in use or always_on. This will become the - * default behaviour in the future. + * we have permission to change the status for and which are + * not in use or always_on. This is effectively the default + * for DT and ACPI as they have full constraints. */ list_for_each_entry(rdev, ®ulator_list, list) { ops = rdev->desc->ops; c = rdev->constraints; - if (!ops->disable || (c && c->always_on)) + if (c && c->always_on) + continue; + + if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS)) continue; mutex_lock(&rdev->mutex); @@ -2800,14 +3859,13 @@ static int __init regulator_init_complete(void) if (!enabled) goto unlock; - if (has_full_constraints) { + if (have_full_constraints()) { /* We log since this may kill the system if it * goes wrong. */ rdev_info(rdev, "disabling\n"); - ret = ops->disable(rdev); - if (ret != 0) { + ret = _regulator_do_disable(rdev); + if (ret != 0) rdev_err(rdev, "couldn't disable: %d\n", ret); - } } else { /* The intention is that in future we will * assume that full constraints are provided @@ -2825,4 +3883,4 @@ unlock: return 0; } -late_initcall(regulator_init_complete); +late_initcall_sync(regulator_init_complete); |