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path: root/drivers/power/ds2782_battery.c
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Diffstat (limited to 'drivers/power/ds2782_battery.c')
-rw-r--r--drivers/power/ds2782_battery.c281
1 files changed, 212 insertions, 69 deletions
diff --git a/drivers/power/ds2782_battery.c b/drivers/power/ds2782_battery.c
index da14f374cb6..041f9b638d2 100644
--- a/drivers/power/ds2782_battery.c
+++ b/drivers/power/ds2782_battery.c
@@ -3,7 +3,11 @@
*
* Copyright (C) 2009 Bluewater Systems Ltd
*
- * Author: Ryan Mallon <ryan@bluewatersys.com>
+ * Author: Ryan Mallon
+ *
+ * DS2786 added by Yulia Vilensky <vilensky@compulab.co.il>
+ *
+ * UEvent sending added by Evgeny Romanov <romanov@neurosoft.ru>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -17,14 +21,17 @@
#include <linux/errno.h>
#include <linux/swab.h>
#include <linux/i2c.h>
+#include <linux/delay.h>
#include <linux/idr.h>
#include <linux/power_supply.h>
+#include <linux/slab.h>
+#include <linux/ds2782_battery.h>
#define DS2782_REG_RARC 0x06 /* Remaining active relative capacity */
-#define DS2782_REG_VOLT_MSB 0x0c
-#define DS2782_REG_TEMP_MSB 0x0a
-#define DS2782_REG_CURRENT_MSB 0x0e
+#define DS278x_REG_VOLT_MSB 0x0c
+#define DS278x_REG_TEMP_MSB 0x0a
+#define DS278x_REG_CURRENT_MSB 0x0e
/* EEPROM Block */
#define DS2782_REG_RSNSP 0x69 /* Sense resistor value */
@@ -32,18 +39,37 @@
/* Current unit measurement in uA for a 1 milli-ohm sense resistor */
#define DS2782_CURRENT_UNITS 1563
-#define to_ds2782_info(x) container_of(x, struct ds2782_info, battery)
+#define DS2786_REG_RARC 0x02 /* Remaining active relative capacity */
+
+#define DS2786_CURRENT_UNITS 25
-struct ds2782_info {
+#define DS278x_DELAY 1000
+
+struct ds278x_info;
+
+struct ds278x_battery_ops {
+ int (*get_battery_current)(struct ds278x_info *info, int *current_uA);
+ int (*get_battery_voltage)(struct ds278x_info *info, int *voltage_uV);
+ int (*get_battery_capacity)(struct ds278x_info *info, int *capacity);
+};
+
+#define to_ds278x_info(x) container_of(x, struct ds278x_info, battery)
+
+struct ds278x_info {
struct i2c_client *client;
struct power_supply battery;
+ struct ds278x_battery_ops *ops;
+ struct delayed_work bat_work;
int id;
+ int rsns;
+ int capacity;
+ int status; /* State Of Charge */
};
static DEFINE_IDR(battery_id);
static DEFINE_MUTEX(battery_lock);
-static inline int ds2782_read_reg(struct ds2782_info *info, int reg, u8 *val)
+static inline int ds278x_read_reg(struct ds278x_info *info, int reg, u8 *val)
{
int ret;
@@ -57,22 +83,22 @@ static inline int ds2782_read_reg(struct ds2782_info *info, int reg, u8 *val)
return 0;
}
-static inline int ds2782_read_reg16(struct ds2782_info *info, int reg_msb,
+static inline int ds278x_read_reg16(struct ds278x_info *info, int reg_msb,
s16 *val)
{
int ret;
- ret = swab16(i2c_smbus_read_word_data(info->client, reg_msb));
+ ret = i2c_smbus_read_word_data(info->client, reg_msb);
if (ret < 0) {
dev_err(&info->client->dev, "register read failed\n");
return ret;
}
- *val = ret;
+ *val = swab16(ret);
return 0;
}
-static int ds2782_get_temp(struct ds2782_info *info, int *temp)
+static int ds278x_get_temp(struct ds278x_info *info, int *temp)
{
s16 raw;
int err;
@@ -83,14 +109,14 @@ static int ds2782_get_temp(struct ds2782_info *info, int *temp)
* celsius. The temperature value is stored as a 10 bit number, plus
* sign in the upper bits of a 16 bit register.
*/
- err = ds2782_read_reg16(info, DS2782_REG_TEMP_MSB, &raw);
+ err = ds278x_read_reg16(info, DS278x_REG_TEMP_MSB, &raw);
if (err)
return err;
*temp = ((raw / 32) * 125) / 100;
return 0;
}
-static int ds2782_get_current(struct ds2782_info *info, int *current_uA)
+static int ds2782_get_current(struct ds278x_info *info, int *current_uA)
{
int sense_res;
int err;
@@ -101,7 +127,7 @@ static int ds2782_get_current(struct ds2782_info *info, int *current_uA)
* The units of measurement for current are dependent on the value of
* the sense resistor.
*/
- err = ds2782_read_reg(info, DS2782_REG_RSNSP, &sense_res_raw);
+ err = ds278x_read_reg(info, DS2782_REG_RSNSP, &sense_res_raw);
if (err)
return err;
if (sense_res_raw == 0) {
@@ -112,14 +138,14 @@ static int ds2782_get_current(struct ds2782_info *info, int *current_uA)
dev_dbg(&info->client->dev, "sense resistor = %d milli-ohms\n",
sense_res);
- err = ds2782_read_reg16(info, DS2782_REG_CURRENT_MSB, &raw);
+ err = ds278x_read_reg16(info, DS278x_REG_CURRENT_MSB, &raw);
if (err)
return err;
*current_uA = raw * (DS2782_CURRENT_UNITS / sense_res);
return 0;
}
-static int ds2782_get_voltage(struct ds2782_info *info, int *voltage_uA)
+static int ds2782_get_voltage(struct ds278x_info *info, int *voltage_uV)
{
s16 raw;
int err;
@@ -128,39 +154,82 @@ static int ds2782_get_voltage(struct ds2782_info *info, int *voltage_uA)
* Voltage is measured in units of 4.88mV. The voltage is stored as
* a 10-bit number plus sign, in the upper bits of a 16-bit register
*/
- err = ds2782_read_reg16(info, DS2782_REG_VOLT_MSB, &raw);
+ err = ds278x_read_reg16(info, DS278x_REG_VOLT_MSB, &raw);
if (err)
return err;
- *voltage_uA = (raw / 32) * 4800;
+ *voltage_uV = (raw / 32) * 4800;
return 0;
}
-static int ds2782_get_capacity(struct ds2782_info *info, int *capacity)
+static int ds2782_get_capacity(struct ds278x_info *info, int *capacity)
{
int err;
u8 raw;
- err = ds2782_read_reg(info, DS2782_REG_RARC, &raw);
+ err = ds278x_read_reg(info, DS2782_REG_RARC, &raw);
if (err)
return err;
*capacity = raw;
- return raw;
+ return 0;
+}
+
+static int ds2786_get_current(struct ds278x_info *info, int *current_uA)
+{
+ int err;
+ s16 raw;
+
+ err = ds278x_read_reg16(info, DS278x_REG_CURRENT_MSB, &raw);
+ if (err)
+ return err;
+ *current_uA = (raw / 16) * (DS2786_CURRENT_UNITS / info->rsns);
+ return 0;
}
-static int ds2782_get_status(struct ds2782_info *info, int *status)
+static int ds2786_get_voltage(struct ds278x_info *info, int *voltage_uV)
+{
+ s16 raw;
+ int err;
+
+ /*
+ * Voltage is measured in units of 1.22mV. The voltage is stored as
+ * a 12-bit number plus sign, in the upper bits of a 16-bit register
+ */
+ err = ds278x_read_reg16(info, DS278x_REG_VOLT_MSB, &raw);
+ if (err)
+ return err;
+ *voltage_uV = (raw / 8) * 1220;
+ return 0;
+}
+
+static int ds2786_get_capacity(struct ds278x_info *info, int *capacity)
+{
+ int err;
+ u8 raw;
+
+ err = ds278x_read_reg(info, DS2786_REG_RARC, &raw);
+ if (err)
+ return err;
+ /* Relative capacity is displayed with resolution 0.5 % */
+ *capacity = raw/2 ;
+ return 0;
+}
+
+static int ds278x_get_status(struct ds278x_info *info, int *status)
{
int err;
int current_uA;
int capacity;
- err = ds2782_get_current(info, &current_uA);
+ err = info->ops->get_battery_current(info, &current_uA);
if (err)
return err;
- err = ds2782_get_capacity(info, &capacity);
+ err = info->ops->get_battery_capacity(info, &capacity);
if (err)
return err;
+ info->capacity = capacity;
+
if (capacity == 100)
*status = POWER_SUPPLY_STATUS_FULL;
else if (current_uA == 0)
@@ -173,32 +242,32 @@ static int ds2782_get_status(struct ds2782_info *info, int *status)
return 0;
}
-static int ds2782_battery_get_property(struct power_supply *psy,
+static int ds278x_battery_get_property(struct power_supply *psy,
enum power_supply_property prop,
union power_supply_propval *val)
{
- struct ds2782_info *info = to_ds2782_info(psy);
+ struct ds278x_info *info = to_ds278x_info(psy);
int ret;
switch (prop) {
case POWER_SUPPLY_PROP_STATUS:
- ret = ds2782_get_status(info, &val->intval);
+ ret = ds278x_get_status(info, &val->intval);
break;
case POWER_SUPPLY_PROP_CAPACITY:
- ret = ds2782_get_capacity(info, &val->intval);
+ ret = info->ops->get_battery_capacity(info, &val->intval);
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
- ret = ds2782_get_voltage(info, &val->intval);
+ ret = info->ops->get_battery_voltage(info, &val->intval);
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
- ret = ds2782_get_current(info, &val->intval);
+ ret = info->ops->get_battery_current(info, &val->intval);
break;
case POWER_SUPPLY_PROP_TEMP:
- ret = ds2782_get_temp(info, &val->intval);
+ ret = ds278x_get_temp(info, &val->intval);
break;
default:
@@ -208,7 +277,28 @@ static int ds2782_battery_get_property(struct power_supply *psy,
return ret;
}
-static enum power_supply_property ds2782_battery_props[] = {
+static void ds278x_bat_update(struct ds278x_info *info)
+{
+ int old_status = info->status;
+ int old_capacity = info->capacity;
+
+ ds278x_get_status(info, &info->status);
+
+ if ((old_status != info->status) || (old_capacity != info->capacity))
+ power_supply_changed(&info->battery);
+}
+
+static void ds278x_bat_work(struct work_struct *work)
+{
+ struct ds278x_info *info;
+
+ info = container_of(work, struct ds278x_info, bat_work.work);
+ ds278x_bat_update(info);
+
+ schedule_delayed_work(&info->bat_work, DS278x_DELAY);
+}
+
+static enum power_supply_property ds278x_battery_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
@@ -216,18 +306,18 @@ static enum power_supply_property ds2782_battery_props[] = {
POWER_SUPPLY_PROP_TEMP,
};
-static void ds2782_power_supply_init(struct power_supply *battery)
+static void ds278x_power_supply_init(struct power_supply *battery)
{
battery->type = POWER_SUPPLY_TYPE_BATTERY;
- battery->properties = ds2782_battery_props;
- battery->num_properties = ARRAY_SIZE(ds2782_battery_props);
- battery->get_property = ds2782_battery_get_property;
+ battery->properties = ds278x_battery_props;
+ battery->num_properties = ARRAY_SIZE(ds278x_battery_props);
+ battery->get_property = ds278x_battery_get_property;
battery->external_power_changed = NULL;
}
-static int ds2782_battery_remove(struct i2c_client *client)
+static int ds278x_battery_remove(struct i2c_client *client)
{
- struct ds2782_info *info = i2c_get_clientdata(client);
+ struct ds278x_info *info = i2c_get_clientdata(client);
power_supply_unregister(&info->battery);
kfree(info->battery.name);
@@ -236,31 +326,81 @@ static int ds2782_battery_remove(struct i2c_client *client)
idr_remove(&battery_id, info->id);
mutex_unlock(&battery_lock);
- i2c_set_clientdata(client, info);
+ cancel_delayed_work(&info->bat_work);
kfree(info);
return 0;
}
-static int ds2782_battery_probe(struct i2c_client *client,
+#ifdef CONFIG_PM_SLEEP
+
+static int ds278x_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct ds278x_info *info = i2c_get_clientdata(client);
+
+ cancel_delayed_work(&info->bat_work);
+ return 0;
+}
+
+static int ds278x_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct ds278x_info *info = i2c_get_clientdata(client);
+
+ schedule_delayed_work(&info->bat_work, DS278x_DELAY);
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(ds278x_battery_pm_ops, ds278x_suspend, ds278x_resume);
+#define DS278X_BATTERY_PM_OPS (&ds278x_battery_pm_ops)
+
+#else
+#define DS278X_BATTERY_PM_OPS NULL
+#endif /* CONFIG_PM_SLEEP */
+
+enum ds278x_num_id {
+ DS2782 = 0,
+ DS2786,
+};
+
+static struct ds278x_battery_ops ds278x_ops[] = {
+ [DS2782] = {
+ .get_battery_current = ds2782_get_current,
+ .get_battery_voltage = ds2782_get_voltage,
+ .get_battery_capacity = ds2782_get_capacity,
+ },
+ [DS2786] = {
+ .get_battery_current = ds2786_get_current,
+ .get_battery_voltage = ds2786_get_voltage,
+ .get_battery_capacity = ds2786_get_capacity,
+ }
+};
+
+static int ds278x_battery_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
- struct ds2782_info *info;
+ struct ds278x_platform_data *pdata = client->dev.platform_data;
+ struct ds278x_info *info;
int ret;
int num;
- /* Get an ID for this battery */
- ret = idr_pre_get(&battery_id, GFP_KERNEL);
- if (ret == 0) {
- ret = -ENOMEM;
- goto fail_id;
+ /*
+ * ds2786 should have the sense resistor value set
+ * in the platform data
+ */
+ if (id->driver_data == DS2786 && !pdata) {
+ dev_err(&client->dev, "missing platform data for ds2786\n");
+ return -EINVAL;
}
+ /* Get an ID for this battery */
mutex_lock(&battery_lock);
- ret = idr_get_new(&battery_id, client, &num);
+ ret = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
mutex_unlock(&battery_lock);
if (ret < 0)
goto fail_id;
+ num = ret;
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info) {
@@ -268,20 +408,32 @@ static int ds2782_battery_probe(struct i2c_client *client,
goto fail_info;
}
- info->battery.name = kasprintf(GFP_KERNEL, "ds2782-%d", num);
+ info->battery.name = kasprintf(GFP_KERNEL, "%s-%d", client->name, num);
if (!info->battery.name) {
ret = -ENOMEM;
goto fail_name;
}
+ if (id->driver_data == DS2786)
+ info->rsns = pdata->rsns;
+
i2c_set_clientdata(client, info);
info->client = client;
- ds2782_power_supply_init(&info->battery);
+ info->id = num;
+ info->ops = &ds278x_ops[id->driver_data];
+ ds278x_power_supply_init(&info->battery);
+
+ info->capacity = 100;
+ info->status = POWER_SUPPLY_STATUS_FULL;
+
+ INIT_DELAYED_WORK(&info->bat_work, ds278x_bat_work);
ret = power_supply_register(&client->dev, &info->battery);
if (ret) {
dev_err(&client->dev, "failed to register battery\n");
goto fail_register;
+ } else {
+ schedule_delayed_work(&info->bat_work, DS278x_DELAY);
}
return 0;
@@ -289,7 +441,6 @@ static int ds2782_battery_probe(struct i2c_client *client,
fail_register:
kfree(info->battery.name);
fail_name:
- i2c_set_clientdata(client, info);
kfree(info);
fail_info:
mutex_lock(&battery_lock);
@@ -299,32 +450,24 @@ fail_id:
return ret;
}
-static const struct i2c_device_id ds2782_id[] = {
- {"ds2782", 0},
+static const struct i2c_device_id ds278x_id[] = {
+ {"ds2782", DS2782},
+ {"ds2786", DS2786},
{},
};
+MODULE_DEVICE_TABLE(i2c, ds278x_id);
-static struct i2c_driver ds2782_battery_driver = {
+static struct i2c_driver ds278x_battery_driver = {
.driver = {
.name = "ds2782-battery",
+ .pm = DS278X_BATTERY_PM_OPS,
},
- .probe = ds2782_battery_probe,
- .remove = ds2782_battery_remove,
- .id_table = ds2782_id,
+ .probe = ds278x_battery_probe,
+ .remove = ds278x_battery_remove,
+ .id_table = ds278x_id,
};
+module_i2c_driver(ds278x_battery_driver);
-static int __init ds2782_init(void)
-{
- return i2c_add_driver(&ds2782_battery_driver);
-}
-module_init(ds2782_init);
-
-static void __exit ds2782_exit(void)
-{
- i2c_del_driver(&ds2782_battery_driver);
-}
-module_exit(ds2782_exit);
-
-MODULE_AUTHOR("Ryan Mallon <ryan@bluewatersys.com>");
+MODULE_AUTHOR("Ryan Mallon");
MODULE_DESCRIPTION("Maxim/Dallas DS2782 Stand-Alone Fuel Gauage IC driver");
MODULE_LICENSE("GPL");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-20 16:40:18 +0000