*
* Copyright (C) 2008 Rodolfo Giometti <giometti@linux.it>
* Copyright (C) 2008 Eurotech S.p.A. <info@eurotech.it>
+ * Copyright (C) 2010-2011 Lars-Peter Clausen <lars@metafoo.de>
*
* Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc.
*
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
*/
+
+/*
+ * Datasheets:
+ * http://focus.ti.com/docs/prod/folders/print/bq27000.html
+ * http://focus.ti.com/docs/prod/folders/print/bq27500.html
+ */
+
#include <linux/module.h>
#include <linux/param.h>
#include <linux/jiffies.h>
#include <linux/slab.h>
#include <asm/unaligned.h>
-#define DRIVER_VERSION "1.1.0"
+#include <linux/power/bq27x00_battery.h>
+
+#define DRIVER_VERSION "1.2.0"
#define BQ27x00_REG_TEMP 0x06
#define BQ27x00_REG_VOLT 0x08
#define BQ27x00_REG_TTE 0x16
#define BQ27x00_REG_TTF 0x18
#define BQ27x00_REG_TTECP 0x26
+#define BQ27x00_REG_NAC 0x0C /* Nominal available capaciy */
+#define BQ27x00_REG_LMD 0x12 /* Last measured discharge */
+#define BQ27x00_REG_CYCT 0x2A /* Cycle count total */
+#define BQ27x00_REG_AE 0x22 /* Available enery */
#define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */
+#define BQ27000_REG_ILMD 0x76 /* Initial last measured discharge */
#define BQ27000_FLAG_CHGS BIT(7)
#define BQ27500_REG_SOC 0x2c
+#define BQ27500_REG_DCAP 0x3C /* Design capacity */
#define BQ27500_FLAG_DSC BIT(0)
#define BQ27500_FLAG_FC BIT(9)
-/* If the system has several batteries we need a different name for each
- * of them...
- */
-static DEFINE_IDR(battery_id);
-static DEFINE_MUTEX(battery_mutex);
+#define BQ27000_RS 20 /* Resistor sense */
struct bq27x00_device_info;
struct bq27x00_access_methods {
- int (*read)(u8 reg, int *rt_value, int b_single,
- struct bq27x00_device_info *di);
+ int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
};
enum bq27x00_chip { BQ27000, BQ27500 };
+struct bq27x00_reg_cache {
+ int temperature;
+ int time_to_empty;
+ int time_to_empty_avg;
+ int time_to_full;
+ int charge_full;
+ int charge_counter;
+ int capacity;
+ int flags;
+
+ int current_now;
+};
+
struct bq27x00_device_info {
struct device *dev;
int id;
- struct bq27x00_access_methods *bus;
- struct power_supply bat;
enum bq27x00_chip chip;
- struct i2c_client *client;
+ struct bq27x00_reg_cache cache;
+ int charge_design_full;
+
+ unsigned long last_update;
+ struct delayed_work work;
+
+ struct power_supply bat;
+
+ struct bq27x00_access_methods bus;
+
+ struct mutex lock;
};
static enum power_supply_property bq27x00_battery_props[] = {
POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_CHARGE_NOW,
+ POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+ POWER_SUPPLY_PROP_CHARGE_COUNTER,
+ POWER_SUPPLY_PROP_ENERGY_NOW,
};
+static unsigned int poll_interval = 360;
+module_param(poll_interval, uint, 0644);
+MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
+ "0 disables polling");
+
/*
* Common code for BQ27x00 devices
*/
-static int bq27x00_read(u8 reg, int *rt_value, int b_single,
- struct bq27x00_device_info *di)
+static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
+ bool single)
{
- return di->bus->read(reg, rt_value, b_single, di);
+ return di->bus.read(di, reg, single);
}
/*
- * Return the battery temperature in tenths of degree Celsius
+ * Return the battery Relative State-of-Charge
* Or < 0 if something fails.
*/
-static int bq27x00_battery_temperature(struct bq27x00_device_info *di)
+static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
{
- int ret;
- int temp = 0;
+ int rsoc;
- ret = bq27x00_read(BQ27x00_REG_TEMP, &temp, 0, di);
- if (ret) {
- dev_err(di->dev, "error reading temperature\n");
- return ret;
+ if (di->chip == BQ27500)
+ rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
+ else
+ rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
+
+ if (rsoc < 0)
+ dev_err(di->dev, "error reading relative State-of-Charge\n");
+
+ return rsoc;
+}
+
+/*
+ * Return a battery charge value in µAh
+ * Or < 0 if something fails.
+ */
+static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
+{
+ int charge;
+
+ charge = bq27x00_read(di, reg, false);
+ if (charge < 0) {
+ dev_err(di->dev, "error reading nominal available capacity\n");
+ return charge;
}
if (di->chip == BQ27500)
- return temp - 2731;
+ charge *= 1000;
else
- return ((temp >> 2) - 273) * 10;
+ charge = charge * 3570 / BQ27000_RS;
+
+ return charge;
}
/*
- * Return the battery Voltage in milivolts
+ * Return the battery Nominal available capaciy in µAh
* Or < 0 if something fails.
*/
-static int bq27x00_battery_voltage(struct bq27x00_device_info *di)
+static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
{
- int ret;
- int volt = 0;
+ return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
+}
- ret = bq27x00_read(BQ27x00_REG_VOLT, &volt, 0, di);
- if (ret) {
- dev_err(di->dev, "error reading voltage\n");
- return ret;
+/*
+ * Return the battery Last measured discharge in µAh
+ * Or < 0 if something fails.
+ */
+static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
+{
+ return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
+}
+
+/*
+ * Return the battery Initial last measured discharge in µAh
+ * Or < 0 if something fails.
+ */
+static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
+{
+ int ilmd;
+
+ if (di->chip == BQ27500)
+ ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
+ else
+ ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
+
+ if (ilmd < 0) {
+ dev_err(di->dev, "error reading initial last measured discharge\n");
+ return ilmd;
}
- return volt * 1000;
+ if (di->chip == BQ27500)
+ ilmd *= 1000;
+ else
+ ilmd = ilmd * 256 * 3570 / BQ27000_RS;
+
+ return ilmd;
}
/*
- * Return the battery average current
- * Note that current can be negative signed as well
- * Or 0 if something fails.
+ * Return the battery Cycle count total
+ * Or < 0 if something fails.
*/
-static int bq27x00_battery_current(struct bq27x00_device_info *di)
+static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
{
- int ret;
- int curr = 0;
- int flags = 0;
+ int cyct;
- ret = bq27x00_read(BQ27x00_REG_AI, &curr, 0, di);
- if (ret) {
- dev_err(di->dev, "error reading current\n");
- return 0;
+ cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
+ if (cyct < 0)
+ dev_err(di->dev, "error reading cycle count total\n");
+
+ return cyct;
+}
+
+/*
+ * Read a time register.
+ * Return < 0 if something fails.
+ */
+static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
+{
+ int tval;
+
+ tval = bq27x00_read(di, reg, false);
+ if (tval < 0) {
+ dev_err(di->dev, "error reading register %02x: %d\n", reg, tval);
+ return tval;
}
- if (di->chip == BQ27500) {
- /* bq27500 returns signed value */
- curr = (int)(s16)curr;
- } else {
- ret = bq27x00_read(BQ27x00_REG_FLAGS, &flags, 0, di);
- if (ret < 0) {
- dev_err(di->dev, "error reading flags\n");
- return 0;
- }
- if (flags & BQ27000_FLAG_CHGS) {
- dev_dbg(di->dev, "negative current!\n");
- curr = -curr;
- }
+ if (tval == 65535)
+ return -ENODATA;
+
+ return tval * 60;
+}
+
+static void bq27x00_update(struct bq27x00_device_info *di)
+{
+ struct bq27x00_reg_cache cache = {0, };
+ bool is_bq27500 = di->chip == BQ27500;
+
+ cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, is_bq27500);
+ if (cache.flags >= 0) {
+ cache.capacity = bq27x00_battery_read_rsoc(di);
+ cache.temperature = bq27x00_read(di, BQ27x00_REG_TEMP, false);
+ cache.time_to_empty = bq27x00_battery_read_time(di, BQ27x00_REG_TTE);
+ cache.time_to_empty_avg = bq27x00_battery_read_time(di, BQ27x00_REG_TTECP);
+ cache.time_to_full = bq27x00_battery_read_time(di, BQ27x00_REG_TTF);
+ cache.charge_full = bq27x00_battery_read_lmd(di);
+ cache.charge_counter = bq27x00_battery_read_cyct(di);
+
+ if (!is_bq27500)
+ cache.current_now = bq27x00_read(di, BQ27x00_REG_AI, false);
+
+ /* We only have to read charge design full once */
+ if (di->charge_design_full <= 0)
+ di->charge_design_full = bq27x00_battery_read_ilmd(di);
+ }
+
+ /* Ignore current_now which is a snapshot of the current battery state
+ * and is likely to be different even between two consecutive reads */
+ if (memcmp(&di->cache, &cache, sizeof(cache) - sizeof(int)) != 0) {
+ di->cache = cache;
+ power_supply_changed(&di->bat);
}
- return curr * 1000;
+ di->last_update = jiffies;
}
+static void bq27x00_battery_poll(struct work_struct *work)
+{
+ struct bq27x00_device_info *di =
+ container_of(work, struct bq27x00_device_info, work.work);
+
+ bq27x00_update(di);
+
+ if (poll_interval > 0) {
+ /* The timer does not have to be accurate. */
+ set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
+ schedule_delayed_work(&di->work, poll_interval * HZ);
+ }
+}
+
+
/*
- * Return the battery Relative State-of-Charge
+ * Return the battery temperature in tenths of degree Celsius
* Or < 0 if something fails.
*/
-static int bq27x00_battery_rsoc(struct bq27x00_device_info *di)
+static int bq27x00_battery_temperature(struct bq27x00_device_info *di,
+ union power_supply_propval *val)
{
- int ret;
- int rsoc = 0;
+ if (di->cache.temperature < 0)
+ return di->cache.temperature;
if (di->chip == BQ27500)
- ret = bq27x00_read(BQ27500_REG_SOC, &rsoc, 0, di);
+ val->intval = di->cache.temperature - 2731;
else
- ret = bq27x00_read(BQ27000_REG_RSOC, &rsoc, 1, di);
- if (ret) {
- dev_err(di->dev, "error reading relative State-of-Charge\n");
- return ret;
+ val->intval = ((di->cache.temperature * 5) - 5463) / 2;
+
+ return 0;
+}
+
+/*
+ * Return the battery average current
+ * Note that current can be negative signed as well
+ * Or 0 if something fails.
+ */
+static int bq27x00_battery_current(struct bq27x00_device_info *di,
+ union power_supply_propval *val)
+{
+ int curr;
+
+ if (di->chip == BQ27500)
+ curr = bq27x00_read(di, BQ27x00_REG_AI, false);
+ else
+ curr = di->cache.current_now;
+
+ if (curr < 0)
+ return curr;
+
+ if (di->chip == BQ27500) {
+ /* bq27500 returns signed value */
+ val->intval = (int)((s16)curr) * 1000;
+ } else {
+ if (di->cache.flags & BQ27000_FLAG_CHGS) {
+ dev_dbg(di->dev, "negative current!\n");
+ curr = -curr;
+ }
+
+ val->intval = curr * 3570 / BQ27000_RS;
}
- return rsoc;
+ return 0;
}
static int bq27x00_battery_status(struct bq27x00_device_info *di,
- union power_supply_propval *val)
+ union power_supply_propval *val)
{
- int flags = 0;
int status;
- int ret;
-
- ret = bq27x00_read(BQ27x00_REG_FLAGS, &flags, 0, di);
- if (ret < 0) {
- dev_err(di->dev, "error reading flags\n");
- return ret;
- }
if (di->chip == BQ27500) {
- if (flags & BQ27500_FLAG_FC)
+ if (di->cache.flags & BQ27500_FLAG_FC)
status = POWER_SUPPLY_STATUS_FULL;
- else if (flags & BQ27500_FLAG_DSC)
+ else if (di->cache.flags & BQ27500_FLAG_DSC)
status = POWER_SUPPLY_STATUS_DISCHARGING;
else
status = POWER_SUPPLY_STATUS_CHARGING;
} else {
- if (flags & BQ27000_FLAG_CHGS)
+ if (di->cache.flags & BQ27000_FLAG_CHGS)
status = POWER_SUPPLY_STATUS_CHARGING;
else
status = POWER_SUPPLY_STATUS_DISCHARGING;
}
val->intval = status;
+
return 0;
}
/*
- * Read a time register.
- * Return < 0 if something fails.
+ * Return the battery Voltage in milivolts
+ * Or < 0 if something fails.
*/
-static int bq27x00_battery_time(struct bq27x00_device_info *di, int reg,
- union power_supply_propval *val)
+static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
+ union power_supply_propval *val)
{
- int tval = 0;
- int ret;
+ int volt;
- ret = bq27x00_read(reg, &tval, 0, di);
- if (ret) {
- dev_err(di->dev, "error reading register %02x\n", reg);
- return ret;
+ volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
+ if (volt < 0)
+ return volt;
+
+ val->intval = volt * 1000;
+
+ return 0;
+}
+
+/*
+ * Return the battery Available energy in µWh
+ * Or < 0 if something fails.
+ */
+static int bq27x00_battery_energy(struct bq27x00_device_info *di,
+ union power_supply_propval *val)
+{
+ int ae;
+
+ ae = bq27x00_read(di, BQ27x00_REG_AE, false);
+ if (ae < 0) {
+ dev_err(di->dev, "error reading available energy\n");
+ return ae;
}
- if (tval == 65535)
- return -ENODATA;
+ if (di->chip == BQ27500)
+ ae *= 1000;
+ else
+ ae = ae * 29200 / BQ27000_RS;
+
+ val->intval = ae;
+
+ return 0;
+}
+
+
+static int bq27x00_simple_value(int value,
+ union power_supply_propval *val)
+{
+ if (value < 0)
+ return value;
+
+ val->intval = value;
- val->intval = tval * 60;
return 0;
}
int ret = 0;
struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
+ mutex_lock(&di->lock);
+ if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
+ cancel_delayed_work_sync(&di->work);
+ bq27x00_battery_poll(&di->work.work);
+ }
+ mutex_unlock(&di->lock);
+
+ if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
+ return -ENODEV;
+
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
ret = bq27x00_battery_status(di, val);
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ ret = bq27x00_battery_voltage(di, val);
+ break;
case POWER_SUPPLY_PROP_PRESENT:
- val->intval = bq27x00_battery_voltage(di);
- if (psp == POWER_SUPPLY_PROP_PRESENT)
- val->intval = val->intval <= 0 ? 0 : 1;
+ val->intval = di->cache.flags < 0 ? 0 : 1;
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
- val->intval = bq27x00_battery_current(di);
+ ret = bq27x00_battery_current(di, val);
break;
case POWER_SUPPLY_PROP_CAPACITY:
- val->intval = bq27x00_battery_rsoc(di);
+ ret = bq27x00_simple_value(di->cache.capacity, val);
break;
case POWER_SUPPLY_PROP_TEMP:
- val->intval = bq27x00_battery_temperature(di);
+ ret = bq27x00_battery_temperature(di, val);
break;
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
- ret = bq27x00_battery_time(di, BQ27x00_REG_TTE, val);
+ ret = bq27x00_simple_value(di->cache.time_to_empty, val);
break;
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
- ret = bq27x00_battery_time(di, BQ27x00_REG_TTECP, val);
+ ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
break;
case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
- ret = bq27x00_battery_time(di, BQ27x00_REG_TTF, val);
+ ret = bq27x00_simple_value(di->cache.time_to_full, val);
+ break;
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ ret = bq27x00_simple_value(di->cache.charge_full, val);
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+ ret = bq27x00_simple_value(di->charge_design_full, val);
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_COUNTER:
+ ret = bq27x00_simple_value(di->cache.charge_counter, val);
+ break;
+ case POWER_SUPPLY_PROP_ENERGY_NOW:
+ ret = bq27x00_battery_energy(di, val);
break;
default:
return -EINVAL;
return ret;
}
-static void bq27x00_powersupply_init(struct bq27x00_device_info *di)
+static void bq27x00_external_power_changed(struct power_supply *psy)
+{
+ struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
+
+ cancel_delayed_work_sync(&di->work);
+ schedule_delayed_work(&di->work, 0);
+}
+
+static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
{
+ int ret;
+
di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
di->bat.properties = bq27x00_battery_props;
di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
di->bat.get_property = bq27x00_battery_get_property;
- di->bat.external_power_changed = NULL;
+ di->bat.external_power_changed = bq27x00_external_power_changed;
+
+ INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
+ mutex_init(&di->lock);
+
+ ret = power_supply_register(di->dev, &di->bat);
+ if (ret) {
+ dev_err(di->dev, "failed to register battery: %d\n", ret);
+ return ret;
+ }
+
+ dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
+
+ bq27x00_update(di);
+
+ return 0;
}
-/*
- * i2c specific code
+static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
+{
+ cancel_delayed_work_sync(&di->work);
+
+ power_supply_unregister(&di->bat);
+
+ mutex_destroy(&di->lock);
+}
+
+
+/* i2c specific code */
+#ifdef CONFIG_BATTERY_BQ27X00_I2C
+
+/* If the system has several batteries we need a different name for each
+ * of them...
*/
+static DEFINE_IDR(battery_id);
+static DEFINE_MUTEX(battery_mutex);
-static int bq27x00_read_i2c(u8 reg, int *rt_value, int b_single,
- struct bq27x00_device_info *di)
+static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
{
- struct i2c_client *client = di->client;
+ struct i2c_client *client = to_i2c_client(di->dev);
struct i2c_msg msg[1];
unsigned char data[2];
- int err;
+ int ret;
if (!client->adapter)
return -ENODEV;
msg->buf = data;
data[0] = reg;
- err = i2c_transfer(client->adapter, msg, 1);
+ ret = i2c_transfer(client->adapter, msg, 1);
- if (err >= 0) {
- if (!b_single)
+ if (ret >= 0) {
+ if (!single)
msg->len = 2;
else
msg->len = 1;
msg->flags = I2C_M_RD;
- err = i2c_transfer(client->adapter, msg, 1);
- if (err >= 0) {
- if (!b_single)
- *rt_value = get_unaligned_le16(data);
+ ret = i2c_transfer(client->adapter, msg, 1);
+ if (ret >= 0) {
+ if (!single)
+ ret = get_unaligned_le16(data);
else
- *rt_value = data[0];
-
- return 0;
+ ret = data[0];
}
}
- return err;
+ return ret;
}
static int bq27x00_battery_probe(struct i2c_client *client,
{
char *name;
struct bq27x00_device_info *di;
- struct bq27x00_access_methods *bus;
int num;
int retval = 0;
retval = -ENOMEM;
goto batt_failed_2;
}
+
di->id = num;
+ di->dev = &client->dev;
di->chip = id->driver_data;
+ di->bat.name = name;
+ di->bus.read = &bq27x00_read_i2c;
- bus = kzalloc(sizeof(*bus), GFP_KERNEL);
- if (!bus) {
- dev_err(&client->dev, "failed to allocate access method "
- "data\n");
- retval = -ENOMEM;
+ if (bq27x00_powersupply_init(di))
goto batt_failed_3;
- }
i2c_set_clientdata(client, di);
- di->dev = &client->dev;
- di->bat.name = name;
- bus->read = &bq27x00_read_i2c;
- di->bus = bus;
- di->client = client;
-
- bq27x00_powersupply_init(di);
-
- retval = power_supply_register(&client->dev, &di->bat);
- if (retval) {
- dev_err(&client->dev, "failed to register battery\n");
- goto batt_failed_4;
- }
-
- dev_info(&client->dev, "support ver. %s enabled\n", DRIVER_VERSION);
return 0;
-batt_failed_4:
- kfree(bus);
batt_failed_3:
kfree(di);
batt_failed_2:
{
struct bq27x00_device_info *di = i2c_get_clientdata(client);
- power_supply_unregister(&di->bat);
+ bq27x00_powersupply_unregister(di);
- kfree(di->bus);
kfree(di->bat.name);
mutex_lock(&battery_mutex);
return 0;
}
-/*
- * Module stuff
- */
-
static const struct i2c_device_id bq27x00_id[] = {
{ "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
{ "bq27500", BQ27500 },
{},
};
+MODULE_DEVICE_TABLE(i2c, bq27x00_id);
static struct i2c_driver bq27x00_battery_driver = {
.driver = {
.id_table = bq27x00_id,
};
+static inline int bq27x00_battery_i2c_init(void)
+{
+ int ret = i2c_add_driver(&bq27x00_battery_driver);
+ if (ret)
+ printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
+
+ return ret;
+}
+
+static inline void bq27x00_battery_i2c_exit(void)
+{
+ i2c_del_driver(&bq27x00_battery_driver);
+}
+
+#else
+
+static inline int bq27x00_battery_i2c_init(void) { return 0; }
+static inline void bq27x00_battery_i2c_exit(void) {};
+
+#endif
+
+/* platform specific code */
+#ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
+
+static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
+ bool single)
+{
+ struct device *dev = di->dev;
+ struct bq27000_platform_data *pdata = dev->platform_data;
+ unsigned int timeout = 3;
+ int upper, lower;
+ int temp;
+
+ if (!single) {
+ /* Make sure the value has not changed in between reading the
+ * lower and the upper part */
+ upper = pdata->read(dev, reg + 1);
+ do {
+ temp = upper;
+ if (upper < 0)
+ return upper;
+
+ lower = pdata->read(dev, reg);
+ if (lower < 0)
+ return lower;
+
+ upper = pdata->read(dev, reg + 1);
+ } while (temp != upper && --timeout);
+
+ if (timeout == 0)
+ return -EIO;
+
+ return (upper << 8) | lower;
+ }
+
+ return pdata->read(dev, reg);
+}
+
+static int __devinit bq27000_battery_probe(struct platform_device *pdev)
+{
+ struct bq27x00_device_info *di;
+ struct bq27000_platform_data *pdata = pdev->dev.platform_data;
+ int ret;
+
+ if (!pdata) {
+ dev_err(&pdev->dev, "no platform_data supplied\n");
+ return -EINVAL;
+ }
+
+ if (!pdata->read) {
+ dev_err(&pdev->dev, "no hdq read callback supplied\n");
+ return -EINVAL;
+ }
+
+ di = kzalloc(sizeof(*di), GFP_KERNEL);
+ if (!di) {
+ dev_err(&pdev->dev, "failed to allocate device info data\n");
+ return -ENOMEM;
+ }
+
+ platform_set_drvdata(pdev, di);
+
+ di->dev = &pdev->dev;
+ di->chip = BQ27000;
+
+ di->bat.name = pdata->name ?: dev_name(&pdev->dev);
+ di->bus.read = &bq27000_read_platform;
+
+ ret = bq27x00_powersupply_init(di);
+ if (ret)
+ goto err_free;
+
+ return 0;
+
+err_free:
+ platform_set_drvdata(pdev, NULL);
+ kfree(di);
+
+ return ret;
+}
+
+static int __devexit bq27000_battery_remove(struct platform_device *pdev)
+{
+ struct bq27x00_device_info *di = platform_get_drvdata(pdev);
+
+ bq27x00_powersupply_unregister(di);
+
+ platform_set_drvdata(pdev, NULL);
+ kfree(di);
+
+ return 0;
+}
+
+static struct platform_driver bq27000_battery_driver = {
+ .probe = bq27000_battery_probe,
+ .remove = __devexit_p(bq27000_battery_remove),
+ .driver = {
+ .name = "bq27000-battery",
+ .owner = THIS_MODULE,
+ },
+};
+
+static inline int bq27x00_battery_platform_init(void)
+{
+ int ret = platform_driver_register(&bq27000_battery_driver);
+ if (ret)
+ printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
+
+ return ret;
+}
+
+static inline void bq27x00_battery_platform_exit(void)
+{
+ platform_driver_unregister(&bq27000_battery_driver);
+}
+
+#else
+
+static inline int bq27x00_battery_platform_init(void) { return 0; }
+static inline void bq27x00_battery_platform_exit(void) {};
+
+#endif
+
+/*
+ * Module stuff
+ */
+
static int __init bq27x00_battery_init(void)
{
int ret;
- ret = i2c_add_driver(&bq27x00_battery_driver);
+ ret = bq27x00_battery_i2c_init();
if (ret)
- printk(KERN_ERR "Unable to register BQ27x00 driver\n");
+ return ret;
+
+ ret = bq27x00_battery_platform_init();
+ if (ret)
+ bq27x00_battery_i2c_exit();
return ret;
}
static void __exit bq27x00_battery_exit(void)
{
- i2c_del_driver(&bq27x00_battery_driver);
+ bq27x00_battery_platform_exit();
+ bq27x00_battery_i2c_exit();
}
module_exit(bq27x00_battery_exit);
git.openpandora.org / pandora-kernel.git / blobdiff