Messages in this thread Patch in this message | | | From | Rodolfo Giometti <> | Date | Wed, 18 Jun 2008 15:08:32 +0200 | Subject | [PATCH] power: support for Texas Instruments BQ27x00 battery managers. |
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The driver supports both HDQ (BQ27000) and I2C (BQ27200) chip version.
Signed-off-by: Rodolfo Giometti <giometti@linux.it> --- drivers/power/Kconfig | 21 ++ drivers/power/Makefile | 1 + drivers/power/bq27x00_battery.c | 511 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 533 insertions(+), 0 deletions(-) create mode 100644 drivers/power/bq27x00_battery.c
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index 58c806e..35e45aa 100644 --- a/drivers/power/Kconfig +++ b/drivers/power/Kconfig @@ -49,4 +49,25 @@ config BATTERY_OLPC help Say Y to enable support for the battery on the OLPC laptop. +config BATTERY_BQ27x00 + tristate "BQ27x00 battery driver" + help + Say Y here to enable support for batteries with BQ27000 or + BQ27200 chip. + +config BATTERY_BQ27000 + bool "BQ27000 battery driver" + depends on BATTERY_BQ27x00 + select W1 + select W1_SLAVE_BQ27000 + help + Say Y here to enable support for batteries with BQ27000(HDQ) chip. + +config BATTERY_BQ27200 + bool "BQ27200 battery driver" + depends on BATTERY_BQ27x00 + select I2C + help + Say Y here to enable support for batteries with BQ27200(I2C) chip. + endif # POWER_SUPPLY diff --git a/drivers/power/Makefile b/drivers/power/Makefile index 6413ded..15aa8cb 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -20,3 +20,4 @@ obj-$(CONFIG_APM_POWER) += apm_power.o obj-$(CONFIG_BATTERY_DS2760) += ds2760_battery.o obj-$(CONFIG_BATTERY_PMU) += pmu_battery.o obj-$(CONFIG_BATTERY_OLPC) += olpc_battery.o +obj-$(CONFIG_BATTERY_BQ27x00) += bq27x00_battery.o diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c new file mode 100644 index 0000000..755a64c --- /dev/null +++ b/drivers/power/bq27x00_battery.c @@ -0,0 +1,511 @@ +/* + * linux/drivers/power/bq27x00_battery.c + * + * BQ27000/BQ27200 battery driver + * + * Copyright (C) 2008 Rodolfo Giometti <giometti@linux.it> + * Copyright (C) 2008 Eurotech S.p.A. <info@eurotech.it> + * + * Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc. + * + * This package is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + * + */ +#include <linux/module.h> +#include <linux/param.h> +#include <linux/jiffies.h> +#include <linux/workqueue.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/power_supply.h> +#include <linux/idr.h> + +#define DRIVER_VERSION "1.0.0" + +#ifdef CONFIG_BATTERY_BQ27000 +#include "../w1/w1.h" +#endif +#ifdef CONFIG_BATTERY_BQ27200 +#include <linux/i2c.h> +#endif + +#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 HIGH_BYTE(A) ((A) << 8) + +/* If the system has several batteries we need a different name for each + * of them... + */ +DEFINE_IDR(battery_id); +DEFINE_MUTEX(battery_mutex); + +struct bq27x00_device_info; +struct bq27x00_access_methods { + int (*read)(u8 reg, int *rt_value, int b_single, + struct bq27x00_device_info *di); +}; + +struct bq27x00_device_info { + struct device *dev; +#ifdef CONFIG_BATTERY_BQ27200 + struct i2c_client *client; + int id; +#endif + int voltage_uV; + int current_uA; + int temp_C; + int charge_rsoc; + struct bq27x00_access_methods *bus; + struct power_supply bat; +}; + +static enum power_supply_property bq27x00_battery_props[] = { + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_CURRENT_NOW, + POWER_SUPPLY_PROP_CAPACITY, + POWER_SUPPLY_PROP_TEMP, +}; + +/* + * Common code for BQ27x00 devices + */ + +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 the battery temperature in Celcius degrees + * Or < 0 if something fails. + */ +static int bq27x00_battery_temperature(struct bq27x00_device_info *di) +{ + int ret, temp = 0; + + ret = bq27x00_read(BQ27x00_REG_TEMP, &temp, 0, di); + if (ret) { + dev_err(di->dev, "error reading temperature\n"); + return ret; + } + + return (temp >> 2) - 273; +} + +/* + * Return the battery Voltage in milivolts + * Or < 0 if something fails. + */ +static int bq27x00_battery_voltage(struct bq27x00_device_info *di) +{ + int ret, volt = 0; + + ret = bq27x00_read(BQ27x00_REG_VOLT, &volt, 0, di); + if (ret) { + dev_err(di->dev, "error reading voltage\n"); + return ret; + } + + return volt; +} + +/* + * 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) +{ + int ret, curr = 0, flags = 0; + + ret = bq27x00_read(BQ27x00_REG_AI, &curr, 0, di); + if (ret) { + 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; + } else + return curr; +} + +/* + * Return the battery Relative State-of-Charge + * Or < 0 if something fails. + */ +static int bq27x00_battery_rsoc(struct bq27x00_device_info *di) +{ + int ret, rsoc = 0; + + ret = bq27x00_read(BQ27x00_REG_RSOC, &rsoc, 1, di); + if (ret) { + dev_err(di->dev, "error reading relative State-of-Charge\n"); + return ret; + } + + return rsoc >> 8; +} + +#define to_bq27x00_device_info(x) container_of((x), \ + struct bq27x00_device_info, bat); + +static int bq27x00_battery_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct bq27x00_device_info *di = to_bq27x00_device_info(psy); + + switch (psp) { + case POWER_SUPPLY_PROP_VOLTAGE_NOW : + case POWER_SUPPLY_PROP_PRESENT : + val->intval = bq27x00_battery_voltage(di); + if (psp == POWER_SUPPLY_PROP_PRESENT) + val->intval = val->intval <= 0 ? 0 : 1; + + break; + + case POWER_SUPPLY_PROP_CURRENT_NOW : + val->intval = bq27x00_battery_current(di); + + break; + + case POWER_SUPPLY_PROP_CAPACITY : + val->intval = bq27x00_battery_rsoc(di); + + break; + + case POWER_SUPPLY_PROP_TEMP : + val->intval = bq27x00_battery_temperature(di); + + break; + + default: + return -EINVAL; + } + + return 0; +} + +static void bq27x00_powersupply_init(struct bq27x00_device_info *di) +{ + 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; + + return; +} + +/* + * BQ27000 specific code + */ + +#ifdef CONFIG_BATTERY_BQ27000 + +extern int w1_bq27000_read(struct device *dev, u8 reg); + +static int bq27000_read(u8 reg, int *rt_value, int b_single, + struct bq27x00_device_info *di) +{ + u8 val; + + val = w1_bq27000_read(di->dev, reg); + *rt_value = val; + + if (!b_single) { + val = w1_bq27000_read(di->dev, reg + 1); + *rt_value += HIGH_BYTE((int) val); + } + + return 0; +} + +static int bq27000_battery_probe(struct platform_device *pdev) +{ + struct bq27x00_device_info *di; + struct bq27x00_access_methods *bus; + int retval = 0; + + di = kzalloc(sizeof(*di), GFP_KERNEL); + if (!di) { + dev_err(&pdev->dev, "failed to allocate device info data\n"); + return -ENOMEM; + } + + bus = kzalloc(sizeof(*bus), GFP_KERNEL); + if (!bus) { + dev_err(&pdev->dev, "failed to allocate access method data\n"); + kfree(di); + return -ENOMEM; + } + + platform_set_drvdata(pdev, di); + + di->dev = &pdev->dev; + di->dev = pdev->dev.parent; + di->bat.name = "bq27000"; + bus->read = &bq27000_read; + di->bus = bus; + + bq27x00_powersupply_init(di); + + retval = power_supply_register(&pdev->dev, &di->bat); + if (retval) { + dev_err(&pdev->dev, "failed to register battery\n"); + goto batt_failed; + } + + dev_info(&pdev->dev, "support ver. %s enabled\n", DRIVER_VERSION); + + return 0; + +batt_failed: + kfree(bus); + kfree(di); + return retval; +} + +static int bq27000_battery_remove(struct platform_device *pdev) +{ + struct bq27x00_device_info *di = platform_get_drvdata(pdev); + + power_supply_unregister(&di->bat); + platform_set_drvdata(pdev, NULL); + kfree(di); + + return 0; +} + +#endif /* CONFIG_BATTERY_BQ27000 */ + +/* + * BQ27200 specific code + */ + +#ifdef CONFIG_BATTERY_BQ27200 + +static int bq27200_read(u8 reg, int *rt_value, int b_single, + struct bq27x00_device_info *di) +{ + struct i2c_client *client = di->client; + struct i2c_msg msg[1]; + unsigned char data[2]; + int err; + + if (!client->adapter) + return -ENODEV; + + msg->addr = client->addr; + msg->flags = 0; + msg->len = 1; + msg->buf = data; + + data[0] = reg; + err = i2c_transfer(client->adapter, msg, 1); + + if (err >= 0) { + if (!b_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 = data[1] | HIGH_BYTE(data[0]); + else + *rt_value = data[0]; + + return 0; + } else + return err; + } else + return err; +} + +static int bq27200_battery_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + char *name; + struct bq27x00_device_info *di; + struct bq27x00_access_methods *bus; + int num, retval = 0; + + /* Get new ID for the new battery device */ + retval = idr_pre_get(&battery_id, GFP_KERNEL); + if (retval == 0) + return -ENOMEM; + mutex_lock(&battery_mutex); + retval = idr_get_new(&battery_id, client, &num); + mutex_unlock(&battery_mutex); + if (retval < 0) + return retval; + + name = kmalloc(16, GFP_KERNEL); + if (!name) { + dev_err(&client->dev, "failed to allocate device name\n"); + retval = -ENOMEM; + goto batt_failed_1; + } + sprintf(name, "bq27200-%d", num); + + di = kzalloc(sizeof(*di), GFP_KERNEL); + if (!di) { + dev_err(&client->dev, "failed to allocate device info data\n"); + retval = -ENOMEM; + goto batt_failed_2; + } + di->id = num; + + bus = kzalloc(sizeof(*bus), GFP_KERNEL); + if (!bus) { + dev_err(&client->dev, "failed to allocate access method " + "data\n"); + retval = -ENOMEM; + goto batt_failed_3; + } + + i2c_set_clientdata(client, di); + di->dev = &client->dev; + di->bat.name = name; + bus->read = &bq27200_read; + 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: + kfree(name); +batt_failed_1: + mutex_lock(&battery_mutex); + idr_remove(&battery_id, num); + mutex_unlock(&battery_mutex); + + return retval; +} + +static int bq27200_battery_remove(struct i2c_client *client) +{ + struct bq27x00_device_info *di = i2c_get_clientdata(client); + + power_supply_unregister(&di->bat); + + kfree(di->bat.name); + + mutex_lock(&battery_mutex); + idr_remove(&battery_id, di->id); + mutex_unlock(&battery_mutex); + + kfree(di); + + return 0; +} + +#endif /* CONFIG_BATTERY_BQ27200 */ + +/* + * Module stuff + */ + +#ifdef CONFIG_BATTERY_BQ27000 + +static struct platform_driver bq27000_battery_driver = { + .probe = bq27000_battery_probe, + .remove = bq27000_battery_remove, + + .driver = { + .name = "bq27000-battery", + }, +}; + +#endif /* CONFIG_BATTERY_BQ27000 */ + +#ifdef CONFIG_BATTERY_BQ27200 + +static const struct i2c_device_id bq27200_id[] = { + { "bq27200", 0 }, +}; + +static struct i2c_driver bq27200_battery_driver = { + .probe = bq27200_battery_probe, + .remove = __devexit_p(bq27200_battery_remove), + + .driver = { + .name = "bq27200-battery", + }, + .id_table = bq27200_id, +}; + +#endif /* CONFIG_BATTERY_BQ27200 */ + +static int __init bq27x00_battery_init(void) +{ + int status = 0; + +#ifdef CONFIG_BATTERY_BQ27000 + status = platform_driver_register(&bq27000_battery_driver); + if (status) + printk(KERN_ERR "Unable to register BQ27000 driver\n"); +#endif +#ifdef CONFIG_BATTERY_BQ27200 + status = i2c_add_driver(&bq27200_battery_driver); + if (status) + printk(KERN_ERR "Unable to register BQ27200 driver\n"); +#endif + return status; +} + +static void __exit bq27x00_battery_exit(void) +{ +#ifdef CONFIG_BATTERY_BQ27000 + platform_driver_unregister(&bq27000_battery_driver); +#endif +#ifdef CONFIG_BATTERY_BQ27200 + i2c_del_driver(&bq27200_battery_driver); +#endif +} + +module_init(bq27x00_battery_init); +module_exit(bq27x00_battery_exit); + +MODULE_AUTHOR("Texas Instruments"); +MODULE_DESCRIPTION("BQ27x00 battery moniter driver"); +MODULE_LICENSE("GPL"); -- 1.5.4.3
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