diff options
Diffstat (limited to 'kernel/drivers/power/collie_battery.c')
| -rw-r--r-- | kernel/drivers/power/collie_battery.c | 421 |
1 files changed, 421 insertions, 0 deletions
diff --git a/kernel/drivers/power/collie_battery.c b/kernel/drivers/power/collie_battery.c new file mode 100644 index 000000000..8a971b3db --- /dev/null +++ b/kernel/drivers/power/collie_battery.c @@ -0,0 +1,421 @@ +/* + * Battery and Power Management code for the Sharp SL-5x00 + * + * Copyright (C) 2009 Thomas Kunze + * + * based on tosa_battery.c + * + * 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 <linux/kernel.h> +#include <linux/module.h> +#include <linux/power_supply.h> +#include <linux/delay.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/gpio.h> +#include <linux/mfd/ucb1x00.h> + +#include <asm/mach/sharpsl_param.h> +#include <asm/mach-types.h> +#include <mach/collie.h> + +static DEFINE_MUTEX(bat_lock); /* protects gpio pins */ +static struct work_struct bat_work; +static struct ucb1x00 *ucb; +static int wakeup_enabled; + +struct collie_bat { + int status; + struct power_supply *psy; + int full_chrg; + + struct mutex work_lock; /* protects data */ + + bool (*is_present)(struct collie_bat *bat); + int gpio_full; + int gpio_charge_on; + + int technology; + + int gpio_bat; + int adc_bat; + int adc_bat_divider; + int bat_max; + int bat_min; + + int gpio_temp; + int adc_temp; + int adc_temp_divider; +}; + +static struct collie_bat collie_bat_main; + +static unsigned long collie_read_bat(struct collie_bat *bat) +{ + unsigned long value = 0; + + if (bat->gpio_bat < 0 || bat->adc_bat < 0) + return 0; + mutex_lock(&bat_lock); + gpio_set_value(bat->gpio_bat, 1); + msleep(5); + ucb1x00_adc_enable(ucb); + value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC); + ucb1x00_adc_disable(ucb); + gpio_set_value(bat->gpio_bat, 0); + mutex_unlock(&bat_lock); + value = value * 1000000 / bat->adc_bat_divider; + + return value; +} + +static unsigned long collie_read_temp(struct collie_bat *bat) +{ + unsigned long value = 0; + if (bat->gpio_temp < 0 || bat->adc_temp < 0) + return 0; + + mutex_lock(&bat_lock); + gpio_set_value(bat->gpio_temp, 1); + msleep(5); + ucb1x00_adc_enable(ucb); + value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC); + ucb1x00_adc_disable(ucb); + gpio_set_value(bat->gpio_temp, 0); + mutex_unlock(&bat_lock); + + value = value * 10000 / bat->adc_temp_divider; + + return value; +} + +static int collie_bat_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + int ret = 0; + struct collie_bat *bat = power_supply_get_drvdata(psy); + + if (bat->is_present && !bat->is_present(bat) + && psp != POWER_SUPPLY_PROP_PRESENT) { + return -ENODEV; + } + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + val->intval = bat->status; + break; + case POWER_SUPPLY_PROP_TECHNOLOGY: + val->intval = bat->technology; + break; + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + val->intval = collie_read_bat(bat); + break; + case POWER_SUPPLY_PROP_VOLTAGE_MAX: + if (bat->full_chrg == -1) + val->intval = bat->bat_max; + else + val->intval = bat->full_chrg; + break; + case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: + val->intval = bat->bat_max; + break; + case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: + val->intval = bat->bat_min; + break; + case POWER_SUPPLY_PROP_TEMP: + val->intval = collie_read_temp(bat); + break; + case POWER_SUPPLY_PROP_PRESENT: + val->intval = bat->is_present ? bat->is_present(bat) : 1; + break; + default: + ret = -EINVAL; + break; + } + return ret; +} + +static void collie_bat_external_power_changed(struct power_supply *psy) +{ + schedule_work(&bat_work); +} + +static irqreturn_t collie_bat_gpio_isr(int irq, void *data) +{ + pr_info("collie_bat_gpio irq\n"); + schedule_work(&bat_work); + return IRQ_HANDLED; +} + +static void collie_bat_update(struct collie_bat *bat) +{ + int old; + struct power_supply *psy = bat->psy; + + mutex_lock(&bat->work_lock); + + old = bat->status; + + if (bat->is_present && !bat->is_present(bat)) { + printk(KERN_NOTICE "%s not present\n", psy->desc->name); + bat->status = POWER_SUPPLY_STATUS_UNKNOWN; + bat->full_chrg = -1; + } else if (power_supply_am_i_supplied(psy)) { + if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) { + gpio_set_value(bat->gpio_charge_on, 1); + mdelay(15); + } + + if (gpio_get_value(bat->gpio_full)) { + if (old == POWER_SUPPLY_STATUS_CHARGING || + bat->full_chrg == -1) + bat->full_chrg = collie_read_bat(bat); + + gpio_set_value(bat->gpio_charge_on, 0); + bat->status = POWER_SUPPLY_STATUS_FULL; + } else { + gpio_set_value(bat->gpio_charge_on, 1); + bat->status = POWER_SUPPLY_STATUS_CHARGING; + } + } else { + gpio_set_value(bat->gpio_charge_on, 0); + bat->status = POWER_SUPPLY_STATUS_DISCHARGING; + } + + if (old != bat->status) + power_supply_changed(psy); + + mutex_unlock(&bat->work_lock); +} + +static void collie_bat_work(struct work_struct *work) +{ + collie_bat_update(&collie_bat_main); +} + + +static enum power_supply_property collie_bat_main_props[] = { + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_TECHNOLOGY, + POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, + POWER_SUPPLY_PROP_VOLTAGE_MAX, + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_TEMP, +}; + +static enum power_supply_property collie_bat_bu_props[] = { + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_TECHNOLOGY, + POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, + POWER_SUPPLY_PROP_VOLTAGE_MAX, + POWER_SUPPLY_PROP_PRESENT, +}; + +static const struct power_supply_desc collie_bat_main_desc = { + .name = "main-battery", + .type = POWER_SUPPLY_TYPE_BATTERY, + .properties = collie_bat_main_props, + .num_properties = ARRAY_SIZE(collie_bat_main_props), + .get_property = collie_bat_get_property, + .external_power_changed = collie_bat_external_power_changed, + .use_for_apm = 1, +}; + +static struct collie_bat collie_bat_main = { + .status = POWER_SUPPLY_STATUS_DISCHARGING, + .full_chrg = -1, + .psy = NULL, + + .gpio_full = COLLIE_GPIO_CO, + .gpio_charge_on = COLLIE_GPIO_CHARGE_ON, + + .technology = POWER_SUPPLY_TECHNOLOGY_LIPO, + + .gpio_bat = COLLIE_GPIO_MBAT_ON, + .adc_bat = UCB_ADC_INP_AD1, + .adc_bat_divider = 155, + .bat_max = 4310000, + .bat_min = 1551 * 1000000 / 414, + + .gpio_temp = COLLIE_GPIO_TMP_ON, + .adc_temp = UCB_ADC_INP_AD0, + .adc_temp_divider = 10000, +}; + +static const struct power_supply_desc collie_bat_bu_desc = { + .name = "backup-battery", + .type = POWER_SUPPLY_TYPE_BATTERY, + .properties = collie_bat_bu_props, + .num_properties = ARRAY_SIZE(collie_bat_bu_props), + .get_property = collie_bat_get_property, + .external_power_changed = collie_bat_external_power_changed, +}; + +static struct collie_bat collie_bat_bu = { + .status = POWER_SUPPLY_STATUS_UNKNOWN, + .full_chrg = -1, + .psy = NULL, + + .gpio_full = -1, + .gpio_charge_on = -1, + + .technology = POWER_SUPPLY_TECHNOLOGY_LiMn, + + .gpio_bat = COLLIE_GPIO_BBAT_ON, + .adc_bat = UCB_ADC_INP_AD1, + .adc_bat_divider = 155, + .bat_max = 3000000, + .bat_min = 1900000, + + .gpio_temp = -1, + .adc_temp = -1, + .adc_temp_divider = -1, +}; + +static struct gpio collie_batt_gpios[] = { + { COLLIE_GPIO_CO, GPIOF_IN, "main battery full" }, + { COLLIE_GPIO_MAIN_BAT_LOW, GPIOF_IN, "main battery low" }, + { COLLIE_GPIO_CHARGE_ON, GPIOF_OUT_INIT_LOW, "main charge on" }, + { COLLIE_GPIO_MBAT_ON, GPIOF_OUT_INIT_LOW, "main battery" }, + { COLLIE_GPIO_TMP_ON, GPIOF_OUT_INIT_LOW, "main battery temp" }, + { COLLIE_GPIO_BBAT_ON, GPIOF_OUT_INIT_LOW, "backup battery" }, +}; + +#ifdef CONFIG_PM +static int collie_bat_suspend(struct ucb1x00_dev *dev) +{ + /* flush all pending status updates */ + flush_work(&bat_work); + + if (device_may_wakeup(&dev->ucb->dev) && + collie_bat_main.status == POWER_SUPPLY_STATUS_CHARGING) + wakeup_enabled = !enable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO)); + else + wakeup_enabled = 0; + + return 0; +} + +static int collie_bat_resume(struct ucb1x00_dev *dev) +{ + if (wakeup_enabled) + disable_irq_wake(gpio_to_irq(COLLIE_GPIO_CO)); + + /* things may have changed while we were away */ + schedule_work(&bat_work); + return 0; +} +#else +#define collie_bat_suspend NULL +#define collie_bat_resume NULL +#endif + +static int collie_bat_probe(struct ucb1x00_dev *dev) +{ + int ret; + struct power_supply_config psy_main_cfg = {}, psy_bu_cfg = {}; + + if (!machine_is_collie()) + return -ENODEV; + + ucb = dev->ucb; + + ret = gpio_request_array(collie_batt_gpios, + ARRAY_SIZE(collie_batt_gpios)); + if (ret) + return ret; + + mutex_init(&collie_bat_main.work_lock); + + INIT_WORK(&bat_work, collie_bat_work); + + psy_main_cfg.drv_data = &collie_bat_main; + collie_bat_main.psy = power_supply_register(&dev->ucb->dev, + &collie_bat_main_desc, + &psy_main_cfg); + if (IS_ERR(collie_bat_main.psy)) { + ret = PTR_ERR(collie_bat_main.psy); + goto err_psy_reg_main; + } + + psy_bu_cfg.drv_data = &collie_bat_bu; + collie_bat_bu.psy = power_supply_register(&dev->ucb->dev, + &collie_bat_bu_desc, + &psy_bu_cfg); + if (IS_ERR(collie_bat_bu.psy)) { + ret = PTR_ERR(collie_bat_bu.psy); + goto err_psy_reg_bu; + } + + ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO), + collie_bat_gpio_isr, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, + "main full", &collie_bat_main); + if (ret) + goto err_irq; + + device_init_wakeup(&ucb->dev, 1); + schedule_work(&bat_work); + + return 0; + +err_irq: + power_supply_unregister(collie_bat_bu.psy); +err_psy_reg_bu: + power_supply_unregister(collie_bat_main.psy); +err_psy_reg_main: + + /* see comment in collie_bat_remove */ + cancel_work_sync(&bat_work); + gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios)); + return ret; +} + +static void collie_bat_remove(struct ucb1x00_dev *dev) +{ + free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main); + + power_supply_unregister(collie_bat_bu.psy); + power_supply_unregister(collie_bat_main.psy); + + /* + * Now cancel the bat_work. We won't get any more schedules, + * since all sources (isr and external_power_changed) are + * unregistered now. + */ + cancel_work_sync(&bat_work); + gpio_free_array(collie_batt_gpios, ARRAY_SIZE(collie_batt_gpios)); +} + +static struct ucb1x00_driver collie_bat_driver = { + .add = collie_bat_probe, + .remove = collie_bat_remove, + .suspend = collie_bat_suspend, + .resume = collie_bat_resume, +}; + +static int __init collie_bat_init(void) +{ + return ucb1x00_register_driver(&collie_bat_driver); +} + +static void __exit collie_bat_exit(void) +{ + ucb1x00_unregister_driver(&collie_bat_driver); +} + +module_init(collie_bat_init); +module_exit(collie_bat_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Thomas Kunze"); +MODULE_DESCRIPTION("Collie battery driver"); |