collie: add battery driver

This driver is based on tosa_battery.c.

1 files changed, 418 insertions, 0 deletions

diff --git a/drivers/power/collie_battery.c b/drivers/power/collie_battery.c
new file mode 100644
index 000000000000..039f41ae217d
--- /dev/null
+++ b/drivers/power/collie_battery.c
@@ -0,0 +1,418 @@
+/*
+ * 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;
+
+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 = container_of(psy, struct collie_bat, 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: %d\n", gpio_get_value(irq_to_gpio(irq)));
+        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->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 struct collie_bat collie_bat_main = {
+        .status = POWER_SUPPLY_STATUS_DISCHARGING,
+        .full_chrg = -1,
+        .psy = {
+                .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,
+        },
+
+        .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 struct collie_bat collie_bat_bu = {
+        .status = POWER_SUPPLY_STATUS_UNKNOWN,
+        .full_chrg = -1,
+
+        .psy = {
+                .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,
+        },
+
+        .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 {
+        int gpio;
+        char *name;
+        bool output;
+        int value;
+} gpios[] = {
+        { COLLIE_GPIO_CO,               "main battery full",    0, 0 },
+        { COLLIE_GPIO_MAIN_BAT_LOW,     "main battery low",     0, 0 },
+        { COLLIE_GPIO_CHARGE_ON,        "main charge on",       1, 0 },
+        { COLLIE_GPIO_MBAT_ON,          "main battery",         1, 0 },
+        { COLLIE_GPIO_TMP_ON,           "main battery temp",    1, 0 },
+        { COLLIE_GPIO_BBAT_ON,          "backup battery",       1, 0 },
+};
+
+#ifdef CONFIG_PM
+static int collie_bat_suspend(struct ucb1x00_dev *dev, pm_message_t state)
+{
+        /* flush all pending status updates */
+        flush_scheduled_work();
+        return 0;
+}
+
+static int collie_bat_resume(struct ucb1x00_dev *dev)
+{
+        /* 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 __devinit collie_bat_probe(struct ucb1x00_dev *dev)
+{
+        int ret;
+        int i;
+
+        if (!machine_is_collie())
+                return -ENODEV;
+
+        ucb = dev->ucb;
+
+        for (i = 0; i < ARRAY_SIZE(gpios); i++) {
+                ret = gpio_request(gpios[i].gpio, gpios[i].name);
+                if (ret) {
+                        i--;
+                        goto err_gpio;
+                }
+
+                if (gpios[i].output)
+                        ret = gpio_direction_output(gpios[i].gpio,
+                                        gpios[i].value);
+                else
+                        ret = gpio_direction_input(gpios[i].gpio);
+
+                if (ret)
+                        goto err_gpio;
+        }
+
+        mutex_init(&collie_bat_main.work_lock);
+
+        INIT_WORK(&bat_work, collie_bat_work);
+
+        ret = power_supply_register(&dev->ucb->dev, &collie_bat_main.psy);
+        if (ret)
+                goto err_psy_reg_main;
+        ret = power_supply_register(&dev->ucb->dev, &collie_bat_bu.psy);
+        if (ret)
+                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) {
+                schedule_work(&bat_work);
+                return 0;
+        }
+        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 */
+        flush_scheduled_work();
+
+        i--;
+err_gpio:
+        for (; i >= 0; i--)
+                gpio_free(gpios[i].gpio);
+
+        return ret;
+}
+
+static void __devexit collie_bat_remove(struct ucb1x00_dev *dev)
+{
+        int i;
+
+        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 flush all pending work.
+         * we won't get any more schedules, since all
+         * sources (isr and external_power_changed)
+         * are unregistered now.
+         */
+        flush_scheduled_work();
+
+        for (i = ARRAY_SIZE(gpios) - 1; i >= 0; i--)
+                gpio_free(gpios[i].gpio);
+}
+
+static struct ucb1x00_driver collie_bat_driver = {
+        .add            = collie_bat_probe,
+        .remove         = __devexit_p(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");