Add s3c-adc-battery driver

s3c-adc-battery is driver for monitoring and charging battery on
iPAQ H1930/H1940/RX1950.

It depends on s3c-adc driver to get battery voltage and current.

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>

4 files changed, 474 insertions, 0 deletions

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 6eae8211197f..d1d3c7006eac 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -136,6 +136,12 @@ config BATTERY_Z2
         help
           Say Y to include support for the battery on the Zipit Z2.
 
+config BATTERY_S3C_ADC
+        tristate "Battery driver for Samsung ADC based monitoring"
+        depends on S3C_ADC
+        help
+          Say Y here to enable support for iPAQ h1930/h1940/rx1950 battery
+
 config CHARGER_PCF50633
         tristate "NXP PCF50633 MBC"
         depends on MFD_PCF50633
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 2b9a81d41b4d..705675ae9f7c 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -33,5 +33,6 @@ obj-$(CONFIG_BATTERY_BQ27x00)	+= bq27x00_battery.o
 obj-$(CONFIG_BATTERY_DA9030)    += da9030_battery.o
 obj-$(CONFIG_BATTERY_MAX17040)  += max17040_battery.o
 obj-$(CONFIG_BATTERY_Z2)        += z2_battery.o
+obj-$(CONFIG_BATTERY_S3C_ADC)   += s3c_adc_battery.o
 obj-$(CONFIG_CHARGER_PCF50633)  += pcf50633-charger.o
 obj-$(CONFIG_BATTERY_INTEL_MID) += intel_mid_battery.o
diff --git a/drivers/power/s3c_adc_battery.c b/drivers/power/s3c_adc_battery.c
new file mode 100644
index 000000000000..fe16b482e912
--- /dev/null
+++ b/drivers/power/s3c_adc_battery.c
@@ -0,0 +1,431 @@
+/*
+ *      iPAQ h1930/h1940/rx1950 battery controler driver
+ *      Copyright (c) Vasily Khoruzhick
+ *      Based on h1940_battery.c by Arnaud Patard
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive for
+ * more details.
+ *
+ */
+
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/leds.h>
+#include <linux/gpio.h>
+#include <linux/err.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+#include <linux/s3c_adc_battery.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+
+#include <plat/adc.h>
+
+#define BAT_POLL_INTERVAL               10000 /* ms */
+#define JITTER_DELAY                    500 /* ms */
+
+struct s3c_adc_bat {
+        struct power_supply             psy;
+        struct s3c_adc_client           *client;
+        struct s3c_adc_bat_pdata        *pdata;
+        int                             volt_value;
+        int                             cur_value;
+        unsigned int                    timestamp;
+        int                             level;
+        int                             status;
+        int                             cable_plugged:1;
+};
+
+static struct delayed_work bat_work;
+
+static void s3c_adc_bat_ext_power_changed(struct power_supply *psy)
+{
+        schedule_delayed_work(&bat_work,
+                msecs_to_jiffies(JITTER_DELAY));
+}
+
+static enum power_supply_property s3c_adc_backup_bat_props[] = {
+        POWER_SUPPLY_PROP_VOLTAGE_NOW,
+        POWER_SUPPLY_PROP_VOLTAGE_MIN,
+        POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+};
+
+static int s3c_adc_backup_bat_get_property(struct power_supply *psy,
+                                enum power_supply_property psp,
+                                union power_supply_propval *val)
+{
+        struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);
+
+        if (!bat) {
+                dev_err(psy->dev, "%s: no battery infos ?!\n", __func__);
+                return -EINVAL;
+        }
+
+        if (bat->volt_value < 0 ||
+                jiffies_to_msecs(jiffies - bat->timestamp) >
+                        BAT_POLL_INTERVAL) {
+                bat->volt_value = s3c_adc_read(bat->client,
+                        bat->pdata->backup_volt_channel);
+                bat->volt_value *= bat->pdata->backup_volt_mult;
+                bat->timestamp = jiffies;
+        }
+
+        switch (psp) {
+        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+                val->intval = bat->volt_value;
+                return 0;
+        case POWER_SUPPLY_PROP_VOLTAGE_MIN:
+                val->intval = bat->pdata->backup_volt_min;
+                return 0;
+        case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+                val->intval = bat->pdata->backup_volt_max;
+                return 0;
+        default:
+                return -EINVAL;
+        }
+}
+
+static struct s3c_adc_bat backup_bat = {
+        .psy = {
+                .name           = "backup-battery",
+                .type           = POWER_SUPPLY_TYPE_BATTERY,
+                .properties     = s3c_adc_backup_bat_props,
+                .num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props),
+                .get_property   = s3c_adc_backup_bat_get_property,
+                .use_for_apm    = 1,
+        },
+};
+
+static enum power_supply_property s3c_adc_main_bat_props[] = {
+        POWER_SUPPLY_PROP_STATUS,
+        POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+        POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
+        POWER_SUPPLY_PROP_CHARGE_NOW,
+        POWER_SUPPLY_PROP_VOLTAGE_NOW,
+        POWER_SUPPLY_PROP_CURRENT_NOW,
+};
+
+static int calc_full_volt(int volt_val, int cur_val, int impedance)
+{
+        return volt_val + cur_val * impedance / 1000;
+}
+
+static int s3c_adc_bat_get_property(struct power_supply *psy,
+                                    enum power_supply_property psp,
+                                    union power_supply_propval *val)
+{
+        struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);
+
+        int new_level;
+        int full_volt;
+        const struct s3c_adc_bat_thresh *lut = bat->pdata->lut_noac;
+        unsigned int lut_size = bat->pdata->lut_noac_cnt;
+
+        if (!bat) {
+                dev_err(psy->dev, "no battery infos ?!\n");
+                return -EINVAL;
+        }
+
+        if (bat->volt_value < 0 || bat->cur_value < 0 ||
+                jiffies_to_msecs(jiffies - bat->timestamp) >
+                        BAT_POLL_INTERVAL) {
+                bat->volt_value = s3c_adc_read(bat->client,
+                        bat->pdata->volt_channel) * bat->pdata->volt_mult;
+                bat->cur_value = s3c_adc_read(bat->client,
+                        bat->pdata->current_channel) * bat->pdata->current_mult;
+                bat->timestamp = jiffies;
+        }
+
+        if (bat->cable_plugged &&
+                ((bat->pdata->gpio_charge_finished < 0) ||
+                !gpio_get_value(bat->pdata->gpio_charge_finished))) {
+                lut = bat->pdata->lut_acin;
+                lut_size = bat->pdata->lut_acin_cnt;
+        }
+
+        new_level = 100000;
+        full_volt = calc_full_volt((bat->volt_value / 1000),
+                (bat->cur_value / 1000), bat->pdata->internal_impedance);
+
+        if (full_volt < calc_full_volt(lut->volt, lut->cur,
+                bat->pdata->internal_impedance)) {
+                lut_size--;
+                while (lut_size--) {
+                        int lut_volt1;
+                        int lut_volt2;
+
+                        lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur,
+                                bat->pdata->internal_impedance);
+                        lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur,
+                                bat->pdata->internal_impedance);
+                        if (full_volt < lut_volt1 && full_volt >= lut_volt2) {
+                                new_level = (lut[1].level +
+                                        (lut[0].level - lut[1].level) *
+                                        (full_volt - lut_volt2) /
+                                        (lut_volt1 - lut_volt2)) * 1000;
+                                break;
+                        }
+                        new_level = lut[1].level * 1000;
+                        lut++;
+                }
+        }
+
+        bat->level = new_level;
+
+        switch (psp) {
+        case POWER_SUPPLY_PROP_STATUS:
+                if (bat->pdata->gpio_charge_finished < 0)
+                        val->intval = bat->level == 100000 ?
+                                POWER_SUPPLY_STATUS_FULL : bat->status;
+                else
+                        val->intval = bat->status;
+                return 0;
+        case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+                val->intval = 100000;
+                return 0;
+        case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
+                val->intval = 0;
+                return 0;
+        case POWER_SUPPLY_PROP_CHARGE_NOW:
+                val->intval = bat->level;
+                return 0;
+        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+                val->intval = bat->volt_value;
+                return 0;
+        case POWER_SUPPLY_PROP_CURRENT_NOW:
+                val->intval = bat->cur_value;
+                return 0;
+        default:
+                return -EINVAL;
+        }
+}
+
+static struct s3c_adc_bat main_bat = {
+        .psy = {
+                .name                   = "main-battery",
+                .type                   = POWER_SUPPLY_TYPE_BATTERY,
+                .properties             = s3c_adc_main_bat_props,
+                .num_properties         = ARRAY_SIZE(s3c_adc_main_bat_props),
+                .get_property           = s3c_adc_bat_get_property,
+                .external_power_changed = s3c_adc_bat_ext_power_changed,
+                .use_for_apm            = 1,
+        },
+};
+
+static void s3c_adc_bat_work(struct work_struct *work)
+{
+        struct s3c_adc_bat *bat = &main_bat;
+        int is_charged;
+        int is_plugged;
+        static int was_plugged;
+
+        is_plugged = power_supply_am_i_supplied(&bat->psy);
+        bat->cable_plugged = is_plugged;
+        if (is_plugged != was_plugged) {
+                was_plugged = is_plugged;
+                if (is_plugged) {
+                        if (bat->pdata->enable_charger)
+                                bat->pdata->enable_charger();
+                        bat->status = POWER_SUPPLY_STATUS_CHARGING;
+                } else {
+                        if (bat->pdata->disable_charger)
+                                bat->pdata->disable_charger();
+                        bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
+                }
+        } else {
+                if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) {
+                        is_charged = gpio_get_value(
+                                main_bat.pdata->gpio_charge_finished);
+                        if (is_charged) {
+                                if (bat->pdata->disable_charger)
+                                        bat->pdata->disable_charger();
+                                bat->status = POWER_SUPPLY_STATUS_FULL;
+                        } else {
+                                if (bat->pdata->enable_charger)
+                                        bat->pdata->enable_charger();
+                                bat->status = POWER_SUPPLY_STATUS_CHARGING;
+                        }
+                }
+        }
+
+        power_supply_changed(&bat->psy);
+}
+
+static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id)
+{
+        schedule_delayed_work(&bat_work,
+                msecs_to_jiffies(JITTER_DELAY));
+        return IRQ_HANDLED;
+}
+
+static int __init s3c_adc_bat_probe(struct platform_device *pdev)
+{
+        struct s3c_adc_client   *client;
+        struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
+        int ret;
+
+        client = s3c_adc_register(pdev, NULL, NULL, 0);
+        if (IS_ERR(client)) {
+                dev_err(&pdev->dev, "cannot register adc\n");
+                return PTR_ERR(client);
+        }
+
+        platform_set_drvdata(pdev, client);
+
+        main_bat.client = client;
+        main_bat.pdata = pdata;
+        main_bat.volt_value = -1;
+        main_bat.cur_value = -1;
+        main_bat.cable_plugged = 0;
+        main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING;
+
+        ret = power_supply_register(&pdev->dev, &main_bat.psy);
+        if (ret)
+                goto err_reg_main;
+        if (pdata->backup_volt_mult) {
+                backup_bat.client = client;
+                backup_bat.pdata = pdev->dev.platform_data;
+                backup_bat.volt_value = -1;
+                ret = power_supply_register(&pdev->dev, &backup_bat.psy);
+                if (ret)
+                        goto err_reg_backup;
+        }
+
+        INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work);
+
+        if (pdata->gpio_charge_finished >= 0) {
+                ret = gpio_request(pdata->gpio_charge_finished, "charged");
+                if (ret)
+                        goto err_gpio;
+
+                ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished),
+                                s3c_adc_bat_charged,
+                                IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+                                "battery charged", NULL);
+                if (ret)
+                        goto err_irq;
+        }
+
+        if (pdata->init) {
+                ret = pdata->init();
+                if (ret)
+                        goto err_platform;
+        }
+
+        dev_info(&pdev->dev, "successfully loaded\n");
+        device_init_wakeup(&pdev->dev, 1);
+
+        /* Schedule timer to check current status */
+        schedule_delayed_work(&bat_work,
+                msecs_to_jiffies(JITTER_DELAY));
+
+        return 0;
+
+err_platform:
+        if (pdata->gpio_charge_finished >= 0)
+                free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
+err_irq:
+        if (pdata->gpio_charge_finished >= 0)
+                gpio_free(pdata->gpio_charge_finished);
+err_gpio:
+        if (pdata->backup_volt_mult)
+                power_supply_unregister(&backup_bat.psy);
+err_reg_backup:
+        power_supply_unregister(&main_bat.psy);
+err_reg_main:
+        return ret;
+}
+
+static int s3c_adc_bat_remove(struct platform_device *pdev)
+{
+        struct s3c_adc_client *client = platform_get_drvdata(pdev);
+        struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
+
+        power_supply_unregister(&main_bat.psy);
+        if (pdata->backup_volt_mult)
+                power_supply_unregister(&backup_bat.psy);
+
+        s3c_adc_release(client);
+
+        if (pdata->gpio_charge_finished >= 0) {
+                free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
+                gpio_free(pdata->gpio_charge_finished);
+        }
+
+        cancel_delayed_work(&bat_work);
+
+        if (pdata->exit)
+                pdata->exit();
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int s3c_adc_bat_suspend(struct platform_device *pdev,
+        pm_message_t state)
+{
+        struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
+
+        if (pdata->gpio_charge_finished >= 0) {
+                if (device_may_wakeup(&pdev->dev))
+                        enable_irq_wake(
+                                gpio_to_irq(pdata->gpio_charge_finished));
+                else {
+                        disable_irq(gpio_to_irq(pdata->gpio_charge_finished));
+                        main_bat.pdata->disable_charger();
+                }
+        }
+
+        return 0;
+}
+
+static int s3c_adc_bat_resume(struct platform_device *pdev)
+{
+        struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
+
+        if (pdata->gpio_charge_finished >= 0) {
+                if (device_may_wakeup(&pdev->dev))
+                        disable_irq_wake(
+                                gpio_to_irq(pdata->gpio_charge_finished));
+                else
+                        enable_irq(gpio_to_irq(pdata->gpio_charge_finished));
+        }
+
+        /* Schedule timer to check current status */
+        schedule_delayed_work(&bat_work,
+                msecs_to_jiffies(JITTER_DELAY));
+
+        return 0;
+}
+#else
+#define s3c_adc_battery_suspend NULL
+#define s3c_adc_battery_resume NULL
+#endif
+
+static struct platform_driver s3c_adc_bat_driver = {
+        .driver         = {
+                .name   = "s3c-adc-battery",
+        },
+        .probe          = s3c_adc_bat_probe,
+        .remove         = s3c_adc_bat_remove,
+        .suspend        = s3c_adc_bat_suspend,
+        .resume         = s3c_adc_bat_resume,
+};
+
+static int __init s3c_adc_bat_init(void)
+{
+        return platform_driver_register(&s3c_adc_bat_driver);
+}
+module_init(s3c_adc_bat_init);
+
+static void __exit s3c_adc_bat_exit(void)
+{
+        platform_driver_unregister(&s3c_adc_bat_driver);
+}
+module_exit(s3c_adc_bat_exit);
+
+MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
+MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controler driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/s3c_adc_battery.h b/include/linux/s3c_adc_battery.h
new file mode 100644
index 000000000000..dbce22faa660
--- /dev/null
+++ b/include/linux/s3c_adc_battery.h
@@ -0,0 +1,36 @@
+#ifndef _S3C_ADC_BATTERY_H
+#define _S3C_ADC_BATTERY_H
+
+struct s3c_adc_bat_thresh {
+        int volt; /* mV */
+        int cur; /* mA */
+        int level; /* percent */
+};
+
+struct s3c_adc_bat_pdata {
+        int (*init)(void);
+        void (*exit)(void);
+        void (*enable_charger)(void);
+        void (*disable_charger)(void);
+
+        int gpio_charge_finished;
+
+        const struct s3c_adc_bat_thresh *lut_noac;
+        unsigned int lut_noac_cnt;
+        const struct s3c_adc_bat_thresh *lut_acin;
+        unsigned int lut_acin_cnt;
+
+        const unsigned int volt_channel;
+        const unsigned int current_channel;
+        const unsigned int backup_volt_channel;
+
+        const unsigned int volt_mult;
+        const unsigned int current_mult;
+        const unsigned int backup_volt_mult;
+        const unsigned int internal_impedance;
+
+        const unsigned int backup_volt_max;
+        const unsigned int backup_volt_min;
+};
+
+#endif