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>
diff --git a/drivers/power/s3c_adc_battery.c b/drivers/power/s3c_adc_battery.c
new file mode 100644
index 0000000..fe16b48
--- /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");