* Madhusudhan Chikkature Rajashekar <madhu.cr@xxxxxx> [080429 01:59]:
> Hi,
>
> I am resending the patch after fixing the comments provided by Felipe.
Pushing today. Can you please send this to appropriate maintainer too?
Tony
>
> Regards,
> Madhu
> ------------------------------------------------------------------------
> This patch provides the battery driver to support BQ27000 and BQ27200 chips.
>
> Signed-off-by: Madhusudhan Chikkature<madhu.cr@xxxxxx>
>
> ---
> drivers/power/Kconfig | 21 +
> drivers/power/Makefile | 1
> drivers/power/bq27x00_battery.c | 564 ++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 586 insertions(+)
>
> Index: linux-omap-2.6/drivers/power/bq27x00_battery.c
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ linux-omap-2.6/drivers/power/bq27x00_battery.c 2008-04-29 11:27:42.962321458 +0530
> @@ -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 <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>
> +
> +#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)
> +
> +#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");
> Index: linux-omap-2.6/drivers/power/Kconfig
> ===================================================================
> --- linux-omap-2.6.orig/drivers/power/Kconfig 2008-04-08 17:15:04.000000000 +0530
> +++ linux-omap-2.6/drivers/power/Kconfig 2008-04-21 08:25:00.000000000 +0530
> @@ -49,4 +49,25 @@
> 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
> Index: linux-omap-2.6/drivers/power/Makefile
> ===================================================================
> --- linux-omap-2.6.orig/drivers/power/Makefile 2008-04-08 17:15:04.000000000 +0530
> +++ linux-omap-2.6/drivers/power/Makefile 2008-04-20 17:03:51.000000000 +0530
> @@ -20,3 +20,4 @@
> 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
>
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