From 8ded2cde3764f52447aa018da4fcafbbf01dd460 Mon Sep 17 00:00:00 2001 From: Madhusudhan Chikkature Rajashekar Date: Tue, 29 Apr 2008 14:28:10 +0530 Subject: [PATCH] Resending: [PATCH] BQ27000/BQ27200 battery monitoring driver for OMAP34xx This patch provides the battery driver to support BQ27000 and BQ27200 chips. Signed-off-by: Madhusudhan Chikkature Signed-off-by: Tony Lindgren --- drivers/power/Kconfig | 21 ++ drivers/power/Makefile | 1 + drivers/power/bq27x00_battery.c | 564 ++++++++++++++++++++++++++++++++ 3 files changed, 586 insertions(+) create mode 100644 drivers/power/bq27x00_battery.c diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index 58c806e9c58..80248f79ae5 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 + select I2C_OMAP + 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 6413ded5fe5..8c0f0af4910 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 00000000000..8b439e8543b --- /dev/null +++ b/drivers/power/bq27x00_battery.c @@ -0,0 +1,564 @@ +/* + * linux/drivers/power/bq27x00_battery.c + * + * BQ27000/BQ27200 battery driver + * + * Copyright (C) 2008 Texas Instruments, Inc. + * + * Author: Texas Instruments + * + * 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 +#include +#include +#include +#include +#include +#include + +#ifdef CONFIG_BATTERY_BQ27000 +#include "../w1/w1.h" +#endif +#ifdef CONFIG_BATTERY_BQ27200 +#include +#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) + +#ifdef CONFIG_BATTERY_BQ27000 +extern int w1_bq27000_read(struct device *dev, u8 reg); +#endif + +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_BQ27000 + struct device *w1_dev; +#endif +#ifdef CONFIG_BATTERY_BQ27200 + struct i2c_client *client; +#endif + unsigned long update_time; + int voltage_uV; + int current_uA; + int temp_C; + int charge_rsoc; + struct bq27x00_access_methods *bus; + struct power_supply bat; + struct delayed_work monitor_work; +}; + +static unsigned int cache_time = 60000; +module_param(cache_time, uint, 0644); +MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); + +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_CHARGE_NOW, + POWER_SUPPLY_PROP_CAPACITY, + POWER_SUPPLY_PROP_TEMP, +}; + +static int bq27x00_read(u8 reg, int *rt_value, int b_single, + struct bq27x00_device_info *di); + +#ifdef CONFIG_BATTERY_BQ27000 +static int bq27000_battery_probe(struct platform_device *dev); +static int bq27000_battery_remove(struct platform_device *dev); +#ifdef CONFIG_PM +static int bq27000_battery_suspend(struct platform_device *dev, + pm_message_t state); +static int bq27000_battery_resume(struct platform_device *dev); +#endif /* CONFIG_PM */ + +static struct platform_driver bq27000_battery_driver = { + .probe = bq27000_battery_probe, + .remove = bq27000_battery_remove, +#ifdef CONFIG_PM + .suspend = bq27000_battery_suspend, + .resume = bq27000_battery_resume, +#endif /* CONFIG_PM */ + .driver = { + .name = "bq27000-battery", + }, +}; +#endif /* CONFIG_BATTERY_BQ27000 */ + +#ifdef CONFIG_BATTERY_BQ27200 +static int bq27200_battery_probe(struct i2c_client *client); +static int bq27200_battery_remove(struct i2c_client *client); +#ifdef CONFIG_PM +static int bq27200_battery_suspend(struct i2c_client *client, + pm_message_t mesg); +static int bq27200_battery_resume(struct i2c_client *client); +#endif /* CONFIG_PM */ +static struct i2c_driver bq27200_battery_driver = { + .driver = { + .name = "bq27200-bat", + }, + .probe = bq27200_battery_probe, + .remove = bq27200_battery_remove, +#ifdef CONFIG_PM + .suspend = bq27200_battery_suspend, + .resume = bq27200_battery_resume, +#endif /* CONFIG_PM */ +}; +#endif /* CONFIG_BATTERY_BQ27200 */ + +/* + * 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) { + pr_err("BQ27x00 battery driver:" + "Error reading temperature from the battery\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) { + pr_err("BQ27x00 battery driver:" + "Error reading battery voltage from the battery\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) { + pr_err("BQ27x00 battery driver:" + "Error reading current from the battery\n"); + return 0; + } + ret = bq27x00_read(BQ27x00_REG_FLAGS, &flags, 0, di); + if (ret < 0) { + pr_err("BQ27x00 battery driver:" + "Error reading battery flags\n"); + return 0; + } + if ((flags & (1 << 7)) != 0) { + pr_debug("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) { + pr_err("BQ27x00 battery driver:" + "Error reading battery Relative" + "State-of-Charge\n"); + return ret; + } + return rsoc; +} + +#ifdef CONFIG_BATTERY_BQ27000 +static inline int bq27000_read(u8 reg, int *rt_value, int b_single, + struct bq27x00_device_info *di) +{ + u8 val; + + val = w1_bq27000_read(di->w1_dev, reg); + *rt_value = val; + + if (!b_single) { + val = 0; + val = w1_bq27000_read(di->w1_dev, reg + 1); + *rt_value += HIGH_BYTE((int) val); + } + + return 0; +} +#else +static inline int bq27000_read(u8 reg, int *rt_value, int b_single, + struct bq27x00_device_info *di) +{ + return 0; +} +#endif + +#ifdef CONFIG_BATTERY_BQ27200 +static inline 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 { + pr_err("BQ27200 I2C read failed\n"); + return err; + } + } else { + pr_err("BQ27200 I2C write failed\n"); + return err; + } +} +#else +static inline int bq27200_read(u8 reg, int *rt_value, int b_single, + struct bq27x00_device_info *di) +{ + return 0; +} +#endif + +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); + return ret; +} + +/* + * Read the battery temp, voltage, current and relative state of charge. + */ +static void bq27x00_battery_read_status(struct bq27x00_device_info *di) +{ + if (di->update_time && time_before(jiffies, di->update_time + + msecs_to_jiffies(cache_time))) + return; + + di->temp_C = bq27x00_battery_temperature(di); + di->voltage_uV = bq27x00_battery_voltage(di); + di->current_uA = bq27x00_battery_current(di); + di->charge_rsoc = bq27x00_battery_rsoc(di); + + di->update_time = jiffies; + + return; +} + +static void bq27x00_battery_work(struct delayed_work *work) +{ + struct bq27x00_device_info *di = container_of(work, + struct bq27x00_device_info, monitor_work); + + bq27x00_battery_read_status(di); + schedule_delayed_work(&di->monitor_work, 100); + return; +} + +#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: + val->intval = di->voltage_uV; + break; + case POWER_SUPPLY_PROP_CURRENT_NOW: + val->intval = di->current_uA; + break; + case POWER_SUPPLY_PROP_CHARGE_NOW: + val->intval = di->charge_rsoc; + break; + case POWER_SUPPLY_PROP_TEMP: + val->intval = di->temp_C; + break; + case POWER_SUPPLY_PROP_CAPACITY: + val->intval = di->charge_rsoc; + break; + case POWER_SUPPLY_PROP_PRESENT: + if (di->voltage_uV == 0) + val->intval = 0; + else + val->intval = 1; + 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; +} + +#ifdef CONFIG_BATTERY_BQ27200 +static int bq27200_battery_probe(struct i2c_client *client) +{ + struct bq27x00_device_info *di; + struct bq27x00_access_methods *bus; + int retval = 0; + + di = kzalloc(sizeof(*di), GFP_KERNEL); + if (!di) { + pr_err("BQ27000 battery driver:" + "Failed to allocate device info structure\n"); + return -ENOMEM; + } + + bus = kzalloc(sizeof(*bus), GFP_KERNEL); + if (!bus) { + pr_err("BQ27000 battery driver:" + "Failed to allocate access method structure\n"); + kfree(di); + return -ENOMEM; + } + + i2c_set_clientdata(client, di); + di->dev = &client->dev; + di->bat.name = "bq27200"; + bus->read = &bq27200_read; + di->bus = bus; + di->client = client; + + bq27x00_powersupply_init(di); + + retval = power_supply_register(&client->dev, &di->bat); + if (retval) { + pr_err("BQ27200 battery driver: Failed to register battery\n"); + goto batt_failed; + } + + INIT_DELAYED_WORK(&di->monitor_work, bq27x00_battery_work); + schedule_delayed_work(&di->monitor_work, 100); + + return 0; + +batt_failed: + kfree(bus); + kfree(di); + return retval; +} + +static int bq27200_battery_remove(struct i2c_client *client) +{ + struct bq27x00_device_info *di = i2c_get_clientdata(client); + + flush_scheduled_work(); + power_supply_unregister(&di->bat); + kfree(di); + + return 0; +} + +#ifdef CONFIG_PM +static int bq27200_battery_suspend(struct i2c_client *client, pm_message_t mesg) +{ + struct bq27x00_device_info *di = i2c_get_clientdata(client); + + cancel_delayed_work(&di->monitor_work); + return 0; +} + +static int bq27200_battery_resume(struct i2c_client *client) +{ + struct bq27x00_device_info *di = i2c_get_clientdata(client); + + schedule_delayed_work(&di->monitor_work, 0); + return 0; +} +#endif /* CONFIG_PM */ +#endif /* CONFIG_BATTERY_BQ27200 */ + +#ifdef CONFIG_BATTERY_BQ27000 +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) { + pr_err("BQ27000 battery driver:" + "Failed to allocate device info structure\n"); + return -ENOMEM; + } + + bus = kzalloc(sizeof(*bus), GFP_KERNEL); + if (!bus) { + pr_err("BQ27000 battery driver:" + "Failed to allocate access method structure\n"); + kfree(di); + return -ENOMEM; + } + + platform_set_drvdata(pdev, di); + + di->dev = &pdev->dev; + di->w1_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) { + pr_err("BQ27000 battery driver: Failed to register battery\n"); + goto batt_failed; + } + + INIT_DELAYED_WORK(&di->monitor_work, bq27x00_battery_work); + schedule_delayed_work(&di->monitor_work, 50); + + 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); + + flush_scheduled_work(); + power_supply_unregister(&di->bat); + platform_set_drvdata(pdev, NULL); + kfree(di); + + return 0; +} + +#ifdef CONFIG_PM +static int bq27000_battery_suspend(struct platform_device *pdev, + pm_message_t state) +{ + struct bq27x00_device_info *di = platform_get_drvdata(pdev); + + cancel_delayed_work(&di->monitor_work); + return 0; +} + +static int bq27000_battery_resume(struct platform_device *pdev) +{ + struct bq27x00_device_info *di = platform_get_drvdata(pdev); + + schedule_delayed_work(&di->monitor_work, 0); + return 0; +} +#endif /* CONFIG_PM */ +#endif /* CONFIG_BATTERY_BQ27000 */ + +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); + 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"); -- 2.41.1