diff options
Diffstat (limited to 'drivers/hwmon/lm78.c')
| -rw-r--r-- | drivers/hwmon/lm78.c | 719 |
1 files changed, 421 insertions, 298 deletions
diff --git a/drivers/hwmon/lm78.c b/drivers/hwmon/lm78.c index ed7859f0e16..9efadfc851b 100644 --- a/drivers/hwmon/lm78.c +++ b/drivers/hwmon/lm78.c @@ -1,48 +1,47 @@ /* - lm78.c - Part of lm_sensors, Linux kernel modules for hardware - monitoring - Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> - Copyright (c) 2007 Jean Delvare <khali@linux-fr.org> - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -*/ + * lm78.c - Part of lm_sensors, Linux kernel modules for hardware + * monitoring + * Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> + * Copyright (c) 2007, 2011 Jean Delvare <jdelvare@suse.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/jiffies.h> #include <linux/i2c.h> -#include <linux/platform_device.h> -#include <linux/ioport.h> #include <linux/hwmon.h> #include <linux/hwmon-vid.h> #include <linux/hwmon-sysfs.h> #include <linux/err.h> #include <linux/mutex.h> -#include <asm/io.h> -/* ISA device, if found */ -static struct platform_device *pdev; +#ifdef CONFIG_ISA +#include <linux/platform_device.h> +#include <linux/ioport.h> +#include <linux/io.h> +#endif /* Addresses to scan */ static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END }; -static unsigned short isa_address = 0x290; - -/* Insmod parameters */ -I2C_CLIENT_INSMOD_2(lm78, lm79); +enum chips { lm78, lm79 }; /* Many LM78 constants specified below */ @@ -75,14 +74,18 @@ I2C_CLIENT_INSMOD_2(lm78, lm79); #define LM78_REG_I2C_ADDR 0x48 -/* Conversions. Rounding and limit checking is only done on the TO_REG - variants. */ +/* + * Conversions. Rounding and limit checking is only done on the TO_REG + * variants. + */ -/* IN: mV, (0V to 4.08V) - REG: 16mV/bit */ +/* + * IN: mV (0V to 4.08V) + * REG: 16mV/bit + */ static inline u8 IN_TO_REG(unsigned long val) { - unsigned long nval = SENSORS_LIMIT(val, 0, 4080); + unsigned long nval = clamp_val(val, 0, 4080); return (nval + 8) / 16; } #define IN_FROM_REG(val) ((val) * 16) @@ -91,20 +94,24 @@ static inline u8 FAN_TO_REG(long rpm, int div) { if (rpm <= 0) return 255; - return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254); + if (rpm > 1350000) + return 1; + return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254); } static inline int FAN_FROM_REG(u8 val, int div) { - return val==0 ? -1 : val==255 ? 0 : 1350000/(val*div); + return val == 0 ? -1 : val == 255 ? 0 : 1350000 / (val * div); } -/* TEMP: mC (-128C to +127C) - REG: 1C/bit, two's complement */ +/* + * TEMP: mC (-128C to +127C) + * REG: 1C/bit, two's complement + */ static inline s8 TEMP_TO_REG(int val) { - int nval = SENSORS_LIMIT(val, -128000, 127000) ; - return nval<0 ? (nval-500)/1000 : (nval+500)/1000; + int nval = clamp_val(val, -128000, 127000) ; + return nval < 0 ? (nval - 500) / 1000 : (nval + 500) / 1000; } static inline int TEMP_FROM_REG(s8 val) @@ -114,25 +121,16 @@ static inline int TEMP_FROM_REG(s8 val) #define DIV_FROM_REG(val) (1 << (val)) -/* There are some complications in a module like this. First off, LM78 chips - may be both present on the SMBus and the ISA bus, and we have to handle - those cases separately at some places. Second, there might be several - LM78 chips available (well, actually, that is probably never done; but - it is a clean illustration of how to handle a case like that). Finally, - a specific chip may be attached to *both* ISA and SMBus, and we would - not like to detect it double. Fortunately, in the case of the LM78 at - least, a register tells us what SMBus address we are on, so that helps - a bit - except if there could be more than one SMBus. Groan. No solution - for this yet. */ - -/* For ISA chips, we abuse the i2c_client addr and name fields. We also use - the driver field to differentiate between I2C and ISA chips. */ struct lm78_data { - struct i2c_client client; + struct i2c_client *client; struct device *hwmon_dev; struct mutex lock; enum chips type; + /* For ISA device only */ + const char *name; + int isa_addr; + struct mutex update_lock; char valid; /* !=0 if following fields are valid */ unsigned long last_updated; /* In jiffies */ @@ -151,37 +149,12 @@ struct lm78_data { }; -static int lm78_attach_adapter(struct i2c_adapter *adapter); -static int lm78_detect(struct i2c_adapter *adapter, int address, int kind); -static int lm78_detach_client(struct i2c_client *client); - -static int __devinit lm78_isa_probe(struct platform_device *pdev); -static int __devexit lm78_isa_remove(struct platform_device *pdev); - static int lm78_read_value(struct lm78_data *data, u8 reg); static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value); static struct lm78_data *lm78_update_device(struct device *dev); static void lm78_init_device(struct lm78_data *data); -static struct i2c_driver lm78_driver = { - .driver = { - .name = "lm78", - }, - .attach_adapter = lm78_attach_adapter, - .detach_client = lm78_detach_client, -}; - -static struct platform_driver lm78_isa_driver = { - .driver = { - .owner = THIS_MODULE, - .name = "lm78", - }, - .probe = lm78_isa_probe, - .remove = lm78_isa_remove, -}; - - /* 7 Voltages */ static ssize_t show_in(struct device *dev, struct device_attribute *da, char *buf) @@ -212,8 +185,13 @@ static ssize_t set_in_min(struct device *dev, struct device_attribute *da, { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct lm78_data *data = dev_get_drvdata(dev); - unsigned long val = simple_strtoul(buf, NULL, 10); int nr = attr->index; + unsigned long val; + int err; + + err = kstrtoul(buf, 10, &val); + if (err) + return err; mutex_lock(&data->update_lock); data->in_min[nr] = IN_TO_REG(val); @@ -227,8 +205,13 @@ static ssize_t set_in_max(struct device *dev, struct device_attribute *da, { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct lm78_data *data = dev_get_drvdata(dev); - unsigned long val = simple_strtoul(buf, NULL, 10); int nr = attr->index; + unsigned long val; + int err; + + err = kstrtoul(buf, 10, &val); + if (err) + return err; mutex_lock(&data->update_lock); data->in_max[nr] = IN_TO_REG(val); @@ -236,7 +219,7 @@ static ssize_t set_in_max(struct device *dev, struct device_attribute *da, mutex_unlock(&data->update_lock); return count; } - + #define show_in_offset(offset) \ static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \ show_in, NULL, offset); \ @@ -272,7 +255,12 @@ static ssize_t set_temp_over(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { struct lm78_data *data = dev_get_drvdata(dev); - long val = simple_strtol(buf, NULL, 10); + long val; + int err; + + err = kstrtol(buf, 10, &val); + if (err) + return err; mutex_lock(&data->update_lock); data->temp_over = TEMP_TO_REG(val); @@ -292,7 +280,12 @@ static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { struct lm78_data *data = dev_get_drvdata(dev); - long val = simple_strtol(buf, NULL, 10); + long val; + int err; + + err = kstrtol(buf, 10, &val); + if (err) + return err; mutex_lock(&data->update_lock); data->temp_hyst = TEMP_TO_REG(val); @@ -315,7 +308,7 @@ static ssize_t show_fan(struct device *dev, struct device_attribute *da, struct lm78_data *data = lm78_update_device(dev); int nr = attr->index; return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr], - DIV_FROM_REG(data->fan_div[nr])) ); + DIV_FROM_REG(data->fan_div[nr]))); } static ssize_t show_fan_min(struct device *dev, struct device_attribute *da, @@ -324,8 +317,8 @@ static ssize_t show_fan_min(struct device *dev, struct device_attribute *da, struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct lm78_data *data = lm78_update_device(dev); int nr = attr->index; - return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan_min[nr], - DIV_FROM_REG(data->fan_div[nr])) ); + return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr], + DIV_FROM_REG(data->fan_div[nr]))); } static ssize_t set_fan_min(struct device *dev, struct device_attribute *da, @@ -334,7 +327,12 @@ static ssize_t set_fan_min(struct device *dev, struct device_attribute *da, struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct lm78_data *data = dev_get_drvdata(dev); int nr = attr->index; - unsigned long val = simple_strtoul(buf, NULL, 10); + unsigned long val; + int err; + + err = kstrtoul(buf, 10, &val); + if (err) + return err; mutex_lock(&data->update_lock); data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr])); @@ -351,32 +349,48 @@ static ssize_t show_fan_div(struct device *dev, struct device_attribute *da, return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index])); } -/* Note: we save and restore the fan minimum here, because its value is - determined in part by the fan divisor. This follows the principle of - least surprise; the user doesn't expect the fan minimum to change just - because the divisor changed. */ +/* + * Note: we save and restore the fan minimum here, because its value is + * determined in part by the fan divisor. This follows the principle of + * least surprise; the user doesn't expect the fan minimum to change just + * because the divisor changed. + */ static ssize_t set_fan_div(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct lm78_data *data = dev_get_drvdata(dev); int nr = attr->index; - unsigned long val = simple_strtoul(buf, NULL, 10); unsigned long min; u8 reg; + unsigned long val; + int err; + + err = kstrtoul(buf, 10, &val); + if (err) + return err; mutex_lock(&data->update_lock); min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])); switch (val) { - case 1: data->fan_div[nr] = 0; break; - case 2: data->fan_div[nr] = 1; break; - case 4: data->fan_div[nr] = 2; break; - case 8: data->fan_div[nr] = 3; break; + case 1: + data->fan_div[nr] = 0; + break; + case 2: + data->fan_div[nr] = 1; + break; + case 4: + data->fan_div[nr] = 2; + break; + case 8: + data->fan_div[nr] = 3; + break; default: - dev_err(dev, "fan_div value %ld not " - "supported. Choose one of 1, 2, 4 or 8!\n", val); + dev_err(dev, + "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n", + val); mutex_unlock(&data->update_lock); return -EINVAL; } @@ -454,17 +468,6 @@ static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7); static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11); static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4); -/* This function is called when: - * lm78_driver is inserted (when this module is loaded), for each - available adapter - * when a new adapter is inserted (and lm78_driver is still present) */ -static int lm78_attach_adapter(struct i2c_adapter *adapter) -{ - if (!(adapter->class & I2C_CLASS_HWMON)) - return 0; - return i2c_probe(adapter, &addr_data, lm78_detect); -} - static struct attribute *lm78_attributes[] = { &sensor_dev_attr_in0_input.dev_attr.attr, &sensor_dev_attr_in0_min.dev_attr.attr, @@ -520,241 +523,242 @@ static const struct attribute_group lm78_group = { .attrs = lm78_attributes, }; -/* I2C devices get this name attribute automatically, but for ISA devices - we must create it by ourselves. */ +/* + * ISA related code + */ +#ifdef CONFIG_ISA + +/* ISA device, if found */ +static struct platform_device *pdev; + +static unsigned short isa_address = 0x290; + +/* + * I2C devices get this name attribute automatically, but for ISA devices + * we must create it by ourselves. + */ static ssize_t show_name(struct device *dev, struct device_attribute *devattr, char *buf) { struct lm78_data *data = dev_get_drvdata(dev); - return sprintf(buf, "%s\n", data->client.name); + return sprintf(buf, "%s\n", data->name); } static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); -/* This function is called by i2c_probe */ -static int lm78_detect(struct i2c_adapter *adapter, int address, int kind) +static struct lm78_data *lm78_data_if_isa(void) { - int i, err; - struct i2c_client *new_client; - struct lm78_data *data; - const char *client_name = ""; - - if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { - err = -ENODEV; - goto ERROR1; - } - - /* OK. For now, we presume we have a valid client. We now create the - client structure, even though we cannot fill it completely yet. - But it allows us to access lm78_{read,write}_value. */ - - if (!(data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL))) { - err = -ENOMEM; - goto ERROR1; - } + return pdev ? platform_get_drvdata(pdev) : NULL; +} - new_client = &data->client; - i2c_set_clientdata(new_client, data); - new_client->addr = address; - new_client->adapter = adapter; - new_client->driver = &lm78_driver; - - /* Now, we do the remaining detection. */ - if (kind < 0) { - if (lm78_read_value(data, LM78_REG_CONFIG) & 0x80) { - err = -ENODEV; - goto ERROR2; - } - if (lm78_read_value(data, LM78_REG_I2C_ADDR) != - address) { - err = -ENODEV; - goto ERROR2; - } - } +/* Returns 1 if the I2C chip appears to be an alias of the ISA chip */ +static int lm78_alias_detect(struct i2c_client *client, u8 chipid) +{ + struct lm78_data *isa; + int i; - /* Determine the chip type. */ - if (kind <= 0) { - i = lm78_read_value(data, LM78_REG_CHIPID); - if (i == 0x00 || i == 0x20 /* LM78 */ - || i == 0x40) /* LM78-J */ - kind = lm78; - else if ((i & 0xfe) == 0xc0) - kind = lm79; - else { - if (kind == 0) - dev_warn(&adapter->dev, "Ignoring 'force' " - "parameter for unknown chip at " - "adapter %d, address 0x%02x\n", - i2c_adapter_id(adapter), address); - err = -ENODEV; - goto ERROR2; - } + if (!pdev) /* No ISA chip */ + return 0; + isa = platform_get_drvdata(pdev); + + if (lm78_read_value(isa, LM78_REG_I2C_ADDR) != client->addr) + return 0; /* Address doesn't match */ + if ((lm78_read_value(isa, LM78_REG_CHIPID) & 0xfe) != (chipid & 0xfe)) + return 0; /* Chip type doesn't match */ + + /* + * We compare all the limit registers, the config register and the + * interrupt mask registers + */ + for (i = 0x2b; i <= 0x3d; i++) { + if (lm78_read_value(isa, i) != + i2c_smbus_read_byte_data(client, i)) + return 0; } - - if (kind == lm78) { - client_name = "lm78"; - } else if (kind == lm79) { - client_name = "lm79"; + if (lm78_read_value(isa, LM78_REG_CONFIG) != + i2c_smbus_read_byte_data(client, LM78_REG_CONFIG)) + return 0; + for (i = 0x43; i <= 0x46; i++) { + if (lm78_read_value(isa, i) != + i2c_smbus_read_byte_data(client, i)) + return 0; } - /* Fill in the remaining client fields and put into the global list */ - strlcpy(new_client->name, client_name, I2C_NAME_SIZE); - data->type = kind; - - /* Tell the I2C layer a new client has arrived */ - if ((err = i2c_attach_client(new_client))) - goto ERROR2; - - /* Initialize the LM78 chip */ - lm78_init_device(data); - - /* Register sysfs hooks */ - if ((err = sysfs_create_group(&new_client->dev.kobj, &lm78_group))) - goto ERROR3; - - data->hwmon_dev = hwmon_device_register(&new_client->dev); - if (IS_ERR(data->hwmon_dev)) { - err = PTR_ERR(data->hwmon_dev); - goto ERROR4; - } + return 1; +} +#else /* !CONFIG_ISA */ +static int lm78_alias_detect(struct i2c_client *client, u8 chipid) +{ return 0; +} -ERROR4: - sysfs_remove_group(&new_client->dev.kobj, &lm78_group); -ERROR3: - i2c_detach_client(new_client); -ERROR2: - kfree(data); -ERROR1: - return err; +static struct lm78_data *lm78_data_if_isa(void) +{ + return NULL; } +#endif /* CONFIG_ISA */ -static int lm78_detach_client(struct i2c_client *client) +static int lm78_i2c_detect(struct i2c_client *client, + struct i2c_board_info *info) { - struct lm78_data *data = i2c_get_clientdata(client); - int err; + int i; + struct lm78_data *isa = lm78_data_if_isa(); + const char *client_name; + struct i2c_adapter *adapter = client->adapter; + int address = client->addr; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + + /* + * We block updates of the ISA device to minimize the risk of + * concurrent access to the same LM78 chip through different + * interfaces. + */ + if (isa) + mutex_lock(&isa->update_lock); + + if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80) + || i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR) != address) + goto err_nodev; - hwmon_device_unregister(data->hwmon_dev); - sysfs_remove_group(&client->dev.kobj, &lm78_group); + /* Explicitly prevent the misdetection of Winbond chips */ + i = i2c_smbus_read_byte_data(client, 0x4f); + if (i == 0xa3 || i == 0x5c) + goto err_nodev; - if ((err = i2c_detach_client(client))) - return err; + /* Determine the chip type. */ + i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID); + if (i == 0x00 || i == 0x20 /* LM78 */ + || i == 0x40) /* LM78-J */ + client_name = "lm78"; + else if ((i & 0xfe) == 0xc0) + client_name = "lm79"; + else + goto err_nodev; + + if (lm78_alias_detect(client, i)) { + dev_dbg(&adapter->dev, + "Device at 0x%02x appears to be the same as ISA device\n", + address); + goto err_nodev; + } - kfree(data); + if (isa) + mutex_unlock(&isa->update_lock); + + strlcpy(info->type, client_name, I2C_NAME_SIZE); return 0; + + err_nodev: + if (isa) + mutex_unlock(&isa->update_lock); + return -ENODEV; } -static int __devinit lm78_isa_probe(struct platform_device *pdev) +static int lm78_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *id) { - int err; struct lm78_data *data; - struct resource *res; - const char *name; + int err; - /* Reserve the ISA region */ - res = platform_get_resource(pdev, IORESOURCE_IO, 0); - if (!request_region(res->start, LM78_EXTENT, "lm78")) { - err = -EBUSY; - goto exit; - } + data = devm_kzalloc(&client->dev, sizeof(struct lm78_data), GFP_KERNEL); + if (!data) + return -ENOMEM; - if (!(data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL))) { - err = -ENOMEM; - goto exit_release_region; - } - mutex_init(&data->lock); - data->client.addr = res->start; - i2c_set_clientdata(&data->client, data); - platform_set_drvdata(pdev, data); - - if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) { - data->type = lm79; - name = "lm79"; - } else { - data->type = lm78; - name = "lm78"; - } - strlcpy(data->client.name, name, I2C_NAME_SIZE); + i2c_set_clientdata(client, data); + data->client = client; + data->type = id->driver_data; /* Initialize the LM78 chip */ lm78_init_device(data); /* Register sysfs hooks */ - if ((err = sysfs_create_group(&pdev->dev.kobj, &lm78_group)) - || (err = device_create_file(&pdev->dev, &dev_attr_name))) - goto exit_remove_files; + err = sysfs_create_group(&client->dev.kobj, &lm78_group); + if (err) + return err; - data->hwmon_dev = hwmon_device_register(&pdev->dev); + data->hwmon_dev = hwmon_device_register(&client->dev); if (IS_ERR(data->hwmon_dev)) { err = PTR_ERR(data->hwmon_dev); - goto exit_remove_files; + goto error; } return 0; - exit_remove_files: - sysfs_remove_group(&pdev->dev.kobj, &lm78_group); - device_remove_file(&pdev->dev, &dev_attr_name); - kfree(data); - exit_release_region: - release_region(res->start, LM78_EXTENT); - exit: +error: + sysfs_remove_group(&client->dev.kobj, &lm78_group); return err; } -static int __devexit lm78_isa_remove(struct platform_device *pdev) +static int lm78_i2c_remove(struct i2c_client *client) { - struct lm78_data *data = platform_get_drvdata(pdev); + struct lm78_data *data = i2c_get_clientdata(client); hwmon_device_unregister(data->hwmon_dev); - sysfs_remove_group(&pdev->dev.kobj, &lm78_group); - device_remove_file(&pdev->dev, &dev_attr_name); - release_region(data->client.addr, LM78_EXTENT); - kfree(data); + sysfs_remove_group(&client->dev.kobj, &lm78_group); return 0; } -/* The SMBus locks itself, but ISA access must be locked explicitly! - We don't want to lock the whole ISA bus, so we lock each client - separately. - We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks, - would slow down the LM78 access and should not be necessary. */ +static const struct i2c_device_id lm78_i2c_id[] = { + { "lm78", lm78 }, + { "lm79", lm79 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, lm78_i2c_id); + +static struct i2c_driver lm78_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = "lm78", + }, + .probe = lm78_i2c_probe, + .remove = lm78_i2c_remove, + .id_table = lm78_i2c_id, + .detect = lm78_i2c_detect, + .address_list = normal_i2c, +}; + +/* + * The SMBus locks itself, but ISA access must be locked explicitly! + * We don't want to lock the whole ISA bus, so we lock each client + * separately. + * We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks, + * would slow down the LM78 access and should not be necessary. + */ static int lm78_read_value(struct lm78_data *data, u8 reg) { - struct i2c_client *client = &data->client; + struct i2c_client *client = data->client; - if (!client->driver) { /* ISA device */ +#ifdef CONFIG_ISA + if (!client) { /* ISA device */ int res; mutex_lock(&data->lock); - outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET); - res = inb_p(client->addr + LM78_DATA_REG_OFFSET); + outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET); + res = inb_p(data->isa_addr + LM78_DATA_REG_OFFSET); mutex_unlock(&data->lock); return res; } else +#endif return i2c_smbus_read_byte_data(client, reg); } -/* The SMBus locks itself, but ISA access muse be locked explicitly! - We don't want to lock the whole ISA bus, so we lock each client - separately. - We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks, - would slow down the LM78 access and should not be necessary. - There are some ugly typecasts here, but the good new is - they should - nowhere else be necessary! */ static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value) { - struct i2c_client *client = &data->client; + struct i2c_client *client = data->client; - if (!client->driver) { /* ISA device */ +#ifdef CONFIG_ISA + if (!client) { /* ISA device */ mutex_lock(&data->lock); - outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET); - outb_p(value, client->addr + LM78_DATA_REG_OFFSET); + outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET); + outb_p(value, data->isa_addr + LM78_DATA_REG_OFFSET); mutex_unlock(&data->lock); return 0; } else +#endif return i2c_smbus_write_byte_data(client, reg, value); } @@ -832,17 +836,103 @@ static struct lm78_data *lm78_update_device(struct device *dev) return data; } +#ifdef CONFIG_ISA +static int lm78_isa_probe(struct platform_device *pdev) +{ + int err; + struct lm78_data *data; + struct resource *res; + + /* Reserve the ISA region */ + res = platform_get_resource(pdev, IORESOURCE_IO, 0); + if (!devm_request_region(&pdev->dev, res->start + LM78_ADDR_REG_OFFSET, + 2, "lm78")) + return -EBUSY; + + data = devm_kzalloc(&pdev->dev, sizeof(struct lm78_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + mutex_init(&data->lock); + data->isa_addr = res->start; + platform_set_drvdata(pdev, data); + + if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) { + data->type = lm79; + data->name = "lm79"; + } else { + data->type = lm78; + data->name = "lm78"; + } + + /* Initialize the LM78 chip */ + lm78_init_device(data); + + /* Register sysfs hooks */ + err = sysfs_create_group(&pdev->dev.kobj, &lm78_group); + if (err) + goto exit_remove_files; + err = device_create_file(&pdev->dev, &dev_attr_name); + if (err) + goto exit_remove_files; + + data->hwmon_dev = hwmon_device_register(&pdev->dev); + if (IS_ERR(data->hwmon_dev)) { + err = PTR_ERR(data->hwmon_dev); + goto exit_remove_files; + } + + return 0; + + exit_remove_files: + sysfs_remove_group(&pdev->dev.kobj, &lm78_group); + device_remove_file(&pdev->dev, &dev_attr_name); + return err; +} + +static int lm78_isa_remove(struct platform_device *pdev) +{ + struct lm78_data *data = platform_get_drvdata(pdev); + + hwmon_device_unregister(data->hwmon_dev); + sysfs_remove_group(&pdev->dev.kobj, &lm78_group); + device_remove_file(&pdev->dev, &dev_attr_name); + + return 0; +} + +static struct platform_driver lm78_isa_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "lm78", + }, + .probe = lm78_isa_probe, + .remove = lm78_isa_remove, +}; + /* return 1 if a supported chip is found, 0 otherwise */ static int __init lm78_isa_found(unsigned short address) { int val, save, found = 0; - - if (!request_region(address, LM78_EXTENT, "lm78")) - return 0; + int port; + + /* + * Some boards declare base+0 to base+7 as a PNP device, some base+4 + * to base+7 and some base+5 to base+6. So we better request each port + * individually for the probing phase. + */ + for (port = address; port < address + LM78_EXTENT; port++) { + if (!request_region(port, 1, "lm78")) { + pr_debug("Failed to request port 0x%x\n", port); + goto release; + } + } #define REALLY_SLOW_IO - /* We need the timeouts for at least some LM78-like - chips. But only if we read 'undefined' registers. */ + /* + * We need the timeouts for at least some LM78-like + * chips. But only if we read 'undefined' registers. + */ val = inb_p(address + 1); if (inb_p(address + 2) != val || inb_p(address + 3) != val @@ -850,8 +940,10 @@ static int __init lm78_isa_found(unsigned short address) goto release; #undef REALLY_SLOW_IO - /* We should be able to change the 7 LSB of the address port. The - MSB (busy flag) should be clear initially, set after the write. */ + /* + * We should be able to change the 7 LSB of the address port. The + * MSB (busy flag) should be clear initially, set after the write. + */ save = inb_p(address + LM78_ADDR_REG_OFFSET); if (save & 0x80) goto release; @@ -897,11 +989,12 @@ static int __init lm78_isa_found(unsigned short address) found = 1; if (found) - pr_info("lm78: Found an %s chip at %#x\n", + pr_info("Found an %s chip at %#x\n", val & 0x80 ? "LM79" : "LM78", (int)address); release: - release_region(address, LM78_EXTENT); + for (port--; port >= address; port--) + release_region(port, 1); return found; } @@ -918,21 +1011,19 @@ static int __init lm78_isa_device_add(unsigned short address) pdev = platform_device_alloc("lm78", address); if (!pdev) { err = -ENOMEM; - printk(KERN_ERR "lm78: Device allocation failed\n"); + pr_err("Device allocation failed\n"); goto exit; } err = platform_device_add_resources(pdev, &res, 1); if (err) { - printk(KERN_ERR "lm78: Device resource addition failed " - "(%d)\n", err); + pr_err("Device resource addition failed (%d)\n", err); goto exit_device_put; } err = platform_device_add(pdev); if (err) { - printk(KERN_ERR "lm78: Device addition failed (%d)\n", - err); + pr_err("Device addition failed (%d)\n", err); goto exit_device_put; } @@ -945,18 +1036,14 @@ static int __init lm78_isa_device_add(unsigned short address) return err; } -static int __init sm_lm78_init(void) +static int __init lm78_isa_register(void) { int res; - res = i2c_add_driver(&lm78_driver); - if (res) - goto exit; - if (lm78_isa_found(isa_address)) { res = platform_driver_register(&lm78_isa_driver); if (res) - goto exit_unreg_i2c_driver; + goto exit; /* Sets global pdev as a side effect */ res = lm78_isa_device_add(isa_address); @@ -968,24 +1055,60 @@ static int __init sm_lm78_init(void) exit_unreg_isa_driver: platform_driver_unregister(&lm78_isa_driver); - exit_unreg_i2c_driver: - i2c_del_driver(&lm78_driver); exit: return res; } -static void __exit sm_lm78_exit(void) +static void lm78_isa_unregister(void) { if (pdev) { platform_device_unregister(pdev); platform_driver_unregister(&lm78_isa_driver); } - i2c_del_driver(&lm78_driver); } +#else /* !CONFIG_ISA */ + +static int __init lm78_isa_register(void) +{ + return 0; +} + +static void lm78_isa_unregister(void) +{ +} +#endif /* CONFIG_ISA */ +static int __init sm_lm78_init(void) +{ + int res; + /* + * We register the ISA device first, so that we can skip the + * registration of an I2C interface to the same device. + */ + res = lm78_isa_register(); + if (res) + goto exit; + + res = i2c_add_driver(&lm78_driver); + if (res) + goto exit_unreg_isa_device; + + return 0; + + exit_unreg_isa_device: + lm78_isa_unregister(); + exit: + return res; +} + +static void __exit sm_lm78_exit(void) +{ + lm78_isa_unregister(); + i2c_del_driver(&lm78_driver); +} -MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); +MODULE_AUTHOR("Frodo Looijaard, Jean Delvare <jdelvare@suse.de>"); MODULE_DESCRIPTION("LM78/LM79 driver"); MODULE_LICENSE("GPL"); |