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path: root/drivers/power/palmtx_battery.c
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Diffstat (limited to 'drivers/power/palmtx_battery.c')
-rw-r--r--drivers/power/palmtx_battery.c198
1 files changed, 198 insertions, 0 deletions
diff --git a/drivers/power/palmtx_battery.c b/drivers/power/palmtx_battery.c
new file mode 100644
index 0000000..244bb27
--- /dev/null
+++ b/drivers/power/palmtx_battery.c
@@ -0,0 +1,198 @@
+/*
+ * linux/drivers/power/palmtx_battery.c
+ *
+ * Battery measurement code for Palm T|X Handheld computer
+ *
+ * based on tosa_battery.c
+ *
+ * Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
+ *
+ * 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/wm97xx.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+
+#include <asm/mach-types.h>
+#include <asm/arch/palmtx.h>
+
+static DEFINE_MUTEX(bat_lock);
+static struct work_struct bat_work;
+struct mutex work_lock;
+int bat_status = POWER_SUPPLY_STATUS_DISCHARGING;
+
+static unsigned long palmtx_read_bat(struct power_supply *bat_ps)
+{
+ return wm97xx_read_aux_adc(bat_ps->dev->parent->driver_data,
+ WM97XX_AUX_ID3) * 1000 / 414;
+}
+
+static unsigned long palmtx_read_temp(struct power_supply *bat_ps)
+{
+ return wm97xx_read_aux_adc(bat_ps->dev->parent->driver_data,
+ WM97XX_AUX_ID2);
+}
+
+static int palmtx_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 = POWER_SUPPLY_TECHNOLOGY_LIPO;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ val->intval = palmtx_read_bat(bat_ps);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MAX:
+ case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+ val->intval = PALMTX_BAT_MAX_VOLTAGE;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+ val->intval = PALMTX_BAT_MIN_VOLTAGE;
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ val->intval = palmtx_read_temp(bat_ps);
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = 1;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static void palmtx_bat_external_power_changed(struct power_supply *bat_ps)
+{
+ schedule_work(&bat_work);
+}
+
+static char *status_text[] = {
+ [POWER_SUPPLY_STATUS_UNKNOWN] = "Unknown",
+ [POWER_SUPPLY_STATUS_CHARGING] = "Charging",
+ [POWER_SUPPLY_STATUS_DISCHARGING] = "Discharging",
+};
+
+static void palmtx_bat_update(struct power_supply *bat_ps)
+{
+ int old_status = bat_status;
+
+ mutex_lock(&work_lock);
+
+ bat_status = gpio_get_value(GPIO_NR_PALMTX_POWER_DETECT) ?
+ POWER_SUPPLY_STATUS_CHARGING :
+ POWER_SUPPLY_STATUS_DISCHARGING;
+
+ if (old_status != bat_status) {
+ pr_debug("%s %s -> %s\n", bat_ps->name,
+ status_text[old_status],
+ status_text[bat_status]);
+ power_supply_changed(bat_ps);
+ }
+
+ mutex_unlock(&work_lock);
+}
+
+static enum power_supply_property palmtx_bat_main_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_VOLTAGE_MAX,
+ POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+ POWER_SUPPLY_PROP_TEMP,
+ POWER_SUPPLY_PROP_PRESENT,
+};
+
+struct power_supply bat_ps = {
+ .name = "main-battery",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .properties = palmtx_bat_main_props,
+ .num_properties = ARRAY_SIZE(palmtx_bat_main_props),
+ .get_property = palmtx_bat_get_property,
+ .external_power_changed = palmtx_bat_external_power_changed,
+ .use_for_apm = 1,
+};
+
+static void palmtx_bat_work(struct work_struct *work)
+{
+ palmtx_bat_update(&bat_ps);
+}
+
+#ifdef CONFIG_PM
+static int palmtx_bat_suspend(struct platform_device *dev, pm_message_t state)
+{
+ flush_scheduled_work();
+ return 0;
+}
+
+static int palmtx_bat_resume(struct platform_device *dev)
+{
+ schedule_work(&bat_work);
+ return 0;
+}
+#else
+#define palmtx_bat_suspend NULL
+#define palmtx_bat_resume NULL
+#endif
+
+static int __devinit palmtx_bat_probe(struct platform_device *dev)
+{
+ int ret = 0;
+
+ if (!machine_is_palmtx())
+ return -ENODEV;
+
+ mutex_init(&work_lock);
+
+ INIT_WORK(&bat_work, palmtx_bat_work);
+
+ ret = power_supply_register(&dev->dev, &bat_ps);
+ if (!ret)
+ schedule_work(&bat_work);
+
+ return ret;
+}
+
+static int __devexit palmtx_bat_remove(struct platform_device *dev)
+{
+ power_supply_unregister(&bat_ps);
+ return 0;
+}
+
+static struct platform_driver palmtx_bat_driver = {
+ .driver.name = "wm97xx-battery",
+ .driver.owner = THIS_MODULE,
+ .probe = palmtx_bat_probe,
+ .remove = __devexit_p(palmtx_bat_remove),
+ .suspend = palmtx_bat_suspend,
+ .resume = palmtx_bat_resume,
+};
+
+static int __init palmtx_bat_init(void)
+{
+ return platform_driver_register(&palmtx_bat_driver);
+}
+
+static void __exit palmtx_bat_exit(void)
+{
+ platform_driver_unregister(&palmtx_bat_driver);
+}
+
+module_init(palmtx_bat_init);
+module_exit(palmtx_bat_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
+MODULE_DESCRIPTION("Palm T|X battery driver");
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