From 4e9687d9c843dc34d368358a36f5f1610e4fbab3 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Marek=20Va=C5=A1ut?= Date: Thu, 11 Sep 2008 19:37:32 +0100 Subject: [ARM] 5248/1: wm97xx generic battery driver This patch adds generic battery driver for wm97xx chips. Signed-off-by: Marek Vasut Acked-by: Anton Vorontsov Acked-by: Mark Brown Signed-off-by: Russell King --- drivers/power/wm97xx_battery.c | 272 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 272 insertions(+) create mode 100644 drivers/power/wm97xx_battery.c (limited to 'drivers/power/wm97xx_battery.c') diff --git a/drivers/power/wm97xx_battery.c b/drivers/power/wm97xx_battery.c new file mode 100644 index 00000000000..8bde92126d3 --- /dev/null +++ b/drivers/power/wm97xx_battery.c @@ -0,0 +1,272 @@ +/* + * linux/drivers/power/wm97xx_battery.c + * + * Battery measurement code for WM97xx + * + * based on tosa_battery.c + * + * Copyright (C) 2008 Marek Vasut + * + * This program 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. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static DEFINE_MUTEX(bat_lock); +static struct work_struct bat_work; +struct mutex work_lock; +static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN; +static struct wm97xx_batt_info *pdata; +static enum power_supply_property *prop; + +static unsigned long wm97xx_read_bat(struct power_supply *bat_ps) +{ + return wm97xx_read_aux_adc(bat_ps->dev->parent->driver_data, + pdata->batt_aux) * pdata->batt_mult / + pdata->batt_div; +} + +static unsigned long wm97xx_read_temp(struct power_supply *bat_ps) +{ + return wm97xx_read_aux_adc(bat_ps->dev->parent->driver_data, + pdata->temp_aux) * pdata->temp_mult / + pdata->temp_div; +} + +static int wm97xx_bat_get_property(struct power_supply *bat_ps, + enum power_supply_property psp, + union power_supply_propval *val) +{ + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + val->intval = bat_status; + break; + case POWER_SUPPLY_PROP_TECHNOLOGY: + val->intval = pdata->batt_tech; + break; + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + if (pdata->batt_aux >= 0) + val->intval = wm97xx_read_bat(bat_ps); + else + return -EINVAL; + break; + case POWER_SUPPLY_PROP_TEMP: + if (pdata->temp_aux >= 0) + val->intval = wm97xx_read_temp(bat_ps); + else + return -EINVAL; + break; + case POWER_SUPPLY_PROP_VOLTAGE_MAX: + if (pdata->max_voltage >= 0) + val->intval = pdata->max_voltage; + else + return -EINVAL; + break; + case POWER_SUPPLY_PROP_VOLTAGE_MIN: + if (pdata->min_voltage >= 0) + val->intval = pdata->min_voltage; + else + return -EINVAL; + break; + case POWER_SUPPLY_PROP_PRESENT: + val->intval = 1; + break; + default: + return -EINVAL; + } + return 0; +} + +static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps) +{ + schedule_work(&bat_work); +} + +static void wm97xx_bat_update(struct power_supply *bat_ps) +{ + int old_status = bat_status; + + mutex_lock(&work_lock); + + bat_status = (pdata->charge_gpio >= 0) ? + (gpio_get_value(pdata->charge_gpio) ? + POWER_SUPPLY_STATUS_DISCHARGING : + POWER_SUPPLY_STATUS_CHARGING) : + POWER_SUPPLY_STATUS_UNKNOWN; + + if (old_status != bat_status) { + pr_debug("%s: %i -> %i\n", bat_ps->name, old_status, + bat_status); + power_supply_changed(bat_ps); + } + + mutex_unlock(&work_lock); +} + +static struct power_supply bat_ps = { + .type = POWER_SUPPLY_TYPE_BATTERY, + .get_property = wm97xx_bat_get_property, + .external_power_changed = wm97xx_bat_external_power_changed, + .use_for_apm = 1, +}; + +static void wm97xx_bat_work(struct work_struct *work) +{ + wm97xx_bat_update(&bat_ps); +} + +#ifdef CONFIG_PM +static int wm97xx_bat_suspend(struct platform_device *dev, pm_message_t state) +{ + flush_scheduled_work(); + return 0; +} + +static int wm97xx_bat_resume(struct platform_device *dev) +{ + schedule_work(&bat_work); + return 0; +} +#else +#define wm97xx_bat_suspend NULL +#define wm97xx_bat_resume NULL +#endif + +static int __devinit wm97xx_bat_probe(struct platform_device *dev) +{ + int ret = 0; + int props = 1; /* POWER_SUPPLY_PROP_PRESENT */ + int i = 0; + + if (dev->id != -1) + return -EINVAL; + + mutex_init(&work_lock); + + if (!pdata) { + dev_err(&dev->dev, "Please use wm97xx_bat_set_pdata\n"); + return -EINVAL; + } + + if (pdata->charge_gpio >= 0 && gpio_is_valid(pdata->charge_gpio)) { + ret = gpio_request(pdata->charge_gpio, "BATT CHRG"); + if (ret) + goto err; + ret = gpio_direction_input(pdata->charge_gpio); + if (ret) + goto err2; + props++; /* POWER_SUPPLY_PROP_STATUS */ + } + + if (pdata->batt_tech >= 0) + props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */ + if (pdata->temp_aux >= 0) + props++; /* POWER_SUPPLY_PROP_TEMP */ + if (pdata->batt_aux >= 0) + props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */ + if (pdata->max_voltage >= 0) + props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */ + if (pdata->min_voltage >= 0) + props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */ + + prop = kzalloc(props * sizeof(*prop), GFP_KERNEL); + if (!prop) + goto err2; + + prop[i++] = POWER_SUPPLY_PROP_PRESENT; + if (pdata->charge_gpio >= 0) + prop[i++] = POWER_SUPPLY_PROP_STATUS; + if (pdata->batt_tech >= 0) + prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY; + if (pdata->temp_aux >= 0) + prop[i++] = POWER_SUPPLY_PROP_TEMP; + if (pdata->batt_aux >= 0) + prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW; + if (pdata->max_voltage >= 0) + prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX; + if (pdata->min_voltage >= 0) + prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN; + + INIT_WORK(&bat_work, wm97xx_bat_work); + + if (!pdata->batt_name) { + dev_info(&dev->dev, "Please consider setting proper battery " + "name in platform definition file, falling " + "back to name \"wm97xx-batt\"\n"); + bat_ps.name = "wm97xx-batt"; + } else + bat_ps.name = pdata->batt_name; + + bat_ps.properties = prop; + bat_ps.num_properties = props; + + ret = power_supply_register(&dev->dev, &bat_ps); + if (!ret) + schedule_work(&bat_work); + else + goto err3; + + return 0; +err3: + kfree(prop); +err2: + gpio_free(pdata->charge_gpio); +err: + return ret; +} + +static int __devexit wm97xx_bat_remove(struct platform_device *dev) +{ + if (pdata && pdata->charge_gpio && pdata->charge_gpio >= 0) + gpio_free(pdata->charge_gpio); + flush_scheduled_work(); + power_supply_unregister(&bat_ps); + kfree(prop); + return 0; +} + +static struct platform_driver wm97xx_bat_driver = { + .driver = { + .name = "wm97xx-battery", + .owner = THIS_MODULE, + }, + .probe = wm97xx_bat_probe, + .remove = __devexit_p(wm97xx_bat_remove), + .suspend = wm97xx_bat_suspend, + .resume = wm97xx_bat_resume, +}; + +static int __init wm97xx_bat_init(void) +{ + return platform_driver_register(&wm97xx_bat_driver); +} + +static void __exit wm97xx_bat_exit(void) +{ + platform_driver_unregister(&wm97xx_bat_driver); +} + +void __init wm97xx_bat_set_pdata(struct wm97xx_batt_info *data) +{ + pdata = data; +} +EXPORT_SYMBOL_GPL(wm97xx_bat_set_pdata); + +module_init(wm97xx_bat_init); +module_exit(wm97xx_bat_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Marek Vasut "); +MODULE_DESCRIPTION("WM97xx battery driver"); -- cgit v1.2.3