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author | David S. Miller <davem@davemloft.net> | 2010-03-15 23:23:54 (GMT) |
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committer | David S. Miller <davem@davemloft.net> | 2010-03-15 23:23:54 (GMT) |
commit | 4961e02f1999e1c3468c09b2669c94d7c3ae82a8 (patch) | |
tree | 44c15abb09d7ba5e17a9aba95ee246648b1c1a8a /drivers/power/bq27x00_battery.c | |
parent | d14a0ebda7d3daede1a99c01527affb9ceaa4c22 (diff) | |
parent | a3d3203e4bb40f253b1541e310dc0f9305be7c84 (diff) | |
download | linux-fsl-qoriq-4961e02f1999e1c3468c09b2669c94d7c3ae82a8.tar.xz |
Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
Diffstat (limited to 'drivers/power/bq27x00_battery.c')
-rw-r--r-- | drivers/power/bq27x00_battery.c | 177 |
1 files changed, 133 insertions, 44 deletions
diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c index 62bb981..bece33e 100644 --- a/drivers/power/bq27x00_battery.c +++ b/drivers/power/bq27x00_battery.c @@ -26,13 +26,22 @@ #include <linux/i2c.h> #include <asm/unaligned.h> -#define DRIVER_VERSION "1.0.0" +#define DRIVER_VERSION "1.1.0" #define BQ27x00_REG_TEMP 0x06 #define BQ27x00_REG_VOLT 0x08 -#define BQ27x00_REG_RSOC 0x0B /* Relative State-of-Charge */ #define BQ27x00_REG_AI 0x14 #define BQ27x00_REG_FLAGS 0x0A +#define BQ27x00_REG_TTE 0x16 +#define BQ27x00_REG_TTF 0x18 +#define BQ27x00_REG_TTECP 0x26 + +#define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */ +#define BQ27000_FLAG_CHGS BIT(7) + +#define BQ27500_REG_SOC 0x2c +#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... @@ -46,25 +55,28 @@ struct bq27x00_access_methods { struct bq27x00_device_info *di); }; +enum bq27x00_chip { BQ27000, BQ27500 }; + struct bq27x00_device_info { struct device *dev; int id; - int voltage_uV; - int current_uA; - int temp_C; - int charge_rsoc; struct bq27x00_access_methods *bus; struct power_supply bat; + enum bq27x00_chip chip; struct i2c_client *client; }; static enum power_supply_property bq27x00_battery_props[] = { + POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_PRESENT, POWER_SUPPLY_PROP_VOLTAGE_NOW, POWER_SUPPLY_PROP_CURRENT_NOW, POWER_SUPPLY_PROP_CAPACITY, POWER_SUPPLY_PROP_TEMP, + POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW, + POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, + POWER_SUPPLY_PROP_TIME_TO_FULL_NOW, }; /* @@ -74,16 +86,11 @@ static enum power_supply_property bq27x00_battery_props[] = { static int bq27x00_read(u8 reg, int *rt_value, int b_single, struct bq27x00_device_info *di) { - int ret; - - ret = di->bus->read(reg, rt_value, b_single, di); - *rt_value = be16_to_cpu(*rt_value); - - return ret; + return di->bus->read(reg, rt_value, b_single, di); } /* - * Return the battery temperature in Celsius degrees + * Return the battery temperature in tenths of degree Celsius * Or < 0 if something fails. */ static int bq27x00_battery_temperature(struct bq27x00_device_info *di) @@ -97,7 +104,10 @@ static int bq27x00_battery_temperature(struct bq27x00_device_info *di) return ret; } - return (temp >> 2) - 273; + if (di->chip == BQ27500) + return temp - 2731; + else + return ((temp >> 2) - 273) * 10; } /* @@ -115,7 +125,7 @@ static int bq27x00_battery_voltage(struct bq27x00_device_info *di) return ret; } - return volt; + return volt * 1000; } /* @@ -134,16 +144,23 @@ static int bq27x00_battery_current(struct bq27x00_device_info *di) dev_err(di->dev, "error reading current\n"); return 0; } - ret = bq27x00_read(BQ27x00_REG_FLAGS, &flags, 0, di); - if (ret < 0) { - dev_err(di->dev, "error reading flags\n"); - return 0; - } - if ((flags & (1 << 7)) != 0) { - dev_dbg(di->dev, "negative current!\n"); - return -curr; + + 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; + } } - return curr; + + return curr * 1000; } /* @@ -155,13 +172,70 @@ static int bq27x00_battery_rsoc(struct bq27x00_device_info *di) int ret; int rsoc = 0; - ret = bq27x00_read(BQ27x00_REG_RSOC, &rsoc, 1, di); + if (di->chip == BQ27500) + ret = bq27x00_read(BQ27500_REG_SOC, &rsoc, 0, di); + 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; } - return rsoc >> 8; + return rsoc; +} + +static int bq27x00_battery_status(struct bq27x00_device_info *di, + 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) + status = POWER_SUPPLY_STATUS_FULL; + else if (flags & BQ27500_FLAG_DSC) + status = POWER_SUPPLY_STATUS_DISCHARGING; + else + status = POWER_SUPPLY_STATUS_CHARGING; + } else { + if (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. + */ +static int bq27x00_battery_time(struct bq27x00_device_info *di, int reg, + union power_supply_propval *val) +{ + int tval = 0; + int ret; + + ret = bq27x00_read(reg, &tval, 0, di); + if (ret) { + dev_err(di->dev, "error reading register %02x\n", reg); + return ret; + } + + if (tval == 65535) + return -ENODATA; + + val->intval = tval * 60; + return 0; } #define to_bq27x00_device_info(x) container_of((x), \ @@ -171,9 +245,13 @@ static int bq27x00_battery_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { + int ret = 0; struct bq27x00_device_info *di = to_bq27x00_device_info(psy); switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + ret = bq27x00_battery_status(di, val); + break; case POWER_SUPPLY_PROP_VOLTAGE_NOW: case POWER_SUPPLY_PROP_PRESENT: val->intval = bq27x00_battery_voltage(di); @@ -189,11 +267,20 @@ static int bq27x00_battery_get_property(struct power_supply *psy, case POWER_SUPPLY_PROP_TEMP: val->intval = bq27x00_battery_temperature(di); break; + case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: + ret = bq27x00_battery_time(di, BQ27x00_REG_TTE, val); + break; + case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: + ret = bq27x00_battery_time(di, BQ27x00_REG_TTECP, val); + break; + case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW: + ret = bq27x00_battery_time(di, BQ27x00_REG_TTF, val); + break; default: return -EINVAL; } - return 0; + return ret; } static void bq27x00_powersupply_init(struct bq27x00_device_info *di) @@ -206,10 +293,10 @@ static void bq27x00_powersupply_init(struct bq27x00_device_info *di) } /* - * BQ27200 specific code + * i2c specific code */ -static int bq27200_read(u8 reg, int *rt_value, int b_single, +static int bq27x00_read_i2c(u8 reg, int *rt_value, int b_single, struct bq27x00_device_info *di) { struct i2c_client *client = di->client; @@ -238,7 +325,7 @@ static int bq27200_read(u8 reg, int *rt_value, int b_single, err = i2c_transfer(client->adapter, msg, 1); if (err >= 0) { if (!b_single) - *rt_value = get_unaligned_be16(data); + *rt_value = get_unaligned_le16(data); else *rt_value = data[0]; @@ -248,7 +335,7 @@ static int bq27200_read(u8 reg, int *rt_value, int b_single, return err; } -static int bq27200_battery_probe(struct i2c_client *client, +static int bq27x00_battery_probe(struct i2c_client *client, const struct i2c_device_id *id) { char *name; @@ -267,7 +354,7 @@ static int bq27200_battery_probe(struct i2c_client *client, if (retval < 0) return retval; - name = kasprintf(GFP_KERNEL, "bq27200-%d", num); + name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num); if (!name) { dev_err(&client->dev, "failed to allocate device name\n"); retval = -ENOMEM; @@ -281,6 +368,7 @@ static int bq27200_battery_probe(struct i2c_client *client, goto batt_failed_2; } di->id = num; + di->chip = id->driver_data; bus = kzalloc(sizeof(*bus), GFP_KERNEL); if (!bus) { @@ -293,7 +381,7 @@ static int bq27200_battery_probe(struct i2c_client *client, i2c_set_clientdata(client, di); di->dev = &client->dev; di->bat.name = name; - bus->read = &bq27200_read; + bus->read = &bq27x00_read_i2c; di->bus = bus; di->client = client; @@ -323,7 +411,7 @@ batt_failed_1: return retval; } -static int bq27200_battery_remove(struct i2c_client *client) +static int bq27x00_battery_remove(struct i2c_client *client) { struct bq27x00_device_info *di = i2c_get_clientdata(client); @@ -344,27 +432,28 @@ static int bq27200_battery_remove(struct i2c_client *client) * Module stuff */ -static const struct i2c_device_id bq27200_id[] = { - { "bq27200", 0 }, +static const struct i2c_device_id bq27x00_id[] = { + { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */ + { "bq27500", BQ27500 }, {}, }; -static struct i2c_driver bq27200_battery_driver = { +static struct i2c_driver bq27x00_battery_driver = { .driver = { - .name = "bq27200-battery", + .name = "bq27x00-battery", }, - .probe = bq27200_battery_probe, - .remove = bq27200_battery_remove, - .id_table = bq27200_id, + .probe = bq27x00_battery_probe, + .remove = bq27x00_battery_remove, + .id_table = bq27x00_id, }; static int __init bq27x00_battery_init(void) { int ret; - ret = i2c_add_driver(&bq27200_battery_driver); + ret = i2c_add_driver(&bq27x00_battery_driver); if (ret) - printk(KERN_ERR "Unable to register BQ27200 driver\n"); + printk(KERN_ERR "Unable to register BQ27x00 driver\n"); return ret; } @@ -372,7 +461,7 @@ module_init(bq27x00_battery_init); static void __exit bq27x00_battery_exit(void) { - i2c_del_driver(&bq27200_battery_driver); + i2c_del_driver(&bq27x00_battery_driver); } module_exit(bq27x00_battery_exit); |