[BATTERY] Apple PMU driver

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Anton Vorontsov <cbou@mail.ru>

3 files changed, 223 insertions, 0 deletions

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 921456243e4b..051724f62fa3 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -35,4 +35,11 @@ config BATTERY_DS2760
         help
           Say Y here to enable support for batteries with ds2760 chip.
 
+config BATTERY_PMU
+        tristate "Apple PMU battery"
+        depends on ADB_PMU
+        help
+          Say Y here to expose battery information on Apple machines
+          through the generic battery class.
+
 endif # POWER_SUPPLY
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index a978ba15f6c5..a072b0400cda 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -18,3 +18,4 @@ obj-$(CONFIG_PDA_POWER)		+= pda_power.o
 obj-$(CONFIG_APM_POWER)         += apm_power.o
 
 obj-$(CONFIG_BATTERY_DS2760)    += ds2760_battery.o
+obj-$(CONFIG_BATTERY_PMU)       += pmu_battery.o
diff --git a/drivers/power/pmu_battery.c b/drivers/power/pmu_battery.c
new file mode 100644
index 000000000000..2fea4af0e40a
--- /dev/null
+++ b/drivers/power/pmu_battery.c
@@ -0,0 +1,215 @@
+/*
+ * Battery class driver for Apple PMU
+ *
+ *      Copyright © 2006  David Woodhouse <dwmw2@infradead.org>
+ *
+ * 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/module.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/power_supply.h>
+#include <linux/adb.h>
+#include <linux/pmu.h>
+
+static struct pmu_battery_dev {
+        struct power_supply bat;
+        struct pmu_battery_info *pbi;
+        char name[16];
+        int propval;
+} *pbats[PMU_MAX_BATTERIES];
+
+#define to_pmu_battery_dev(x) container_of(x, struct pmu_battery_dev, bat)
+
+/*********************************************************************
+ *              Power
+ *********************************************************************/
+
+static int pmu_get_ac_prop(struct power_supply *psy,
+                           enum power_supply_property psp,
+                           union power_supply_propval *val)
+{
+        switch (psp) {
+        case POWER_SUPPLY_PROP_ONLINE:
+                val->intval = (!!(pmu_power_flags & PMU_PWR_AC_PRESENT)) ||
+                              (pmu_battery_count == 0);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static enum power_supply_property pmu_ac_props[] = {
+        POWER_SUPPLY_PROP_ONLINE,
+};
+
+static struct power_supply pmu_ac = {
+        .name = "pmu-ac",
+        .type = POWER_SUPPLY_TYPE_MAINS,
+        .properties = pmu_ac_props,
+        .num_properties = ARRAY_SIZE(pmu_ac_props),
+        .get_property = pmu_get_ac_prop,
+};
+
+/*********************************************************************
+ *              Battery properties
+ *********************************************************************/
+
+static char *pmu_batt_types[] = {
+        "Smart", "Comet", "Hooper", "Unknown"
+};
+
+static char *pmu_bat_get_model_name(struct pmu_battery_info *pbi)
+{
+        switch (pbi->flags & PMU_BATT_TYPE_MASK) {
+        case PMU_BATT_TYPE_SMART:
+                return pmu_batt_types[0];
+        case PMU_BATT_TYPE_COMET:
+                return pmu_batt_types[1];
+        case PMU_BATT_TYPE_HOOPER:
+                return pmu_batt_types[2];
+        default: break;
+        }
+        return pmu_batt_types[3];
+}
+
+static int pmu_bat_get_property(struct power_supply *psy,
+                                enum power_supply_property psp,
+                                union power_supply_propval *val)
+{
+        struct pmu_battery_dev *pbat = to_pmu_battery_dev(psy);
+        struct pmu_battery_info *pbi = pbat->pbi;
+
+        switch (psp) {
+        case POWER_SUPPLY_PROP_STATUS:
+                if (pbi->flags & PMU_BATT_CHARGING)
+                        val->intval = POWER_SUPPLY_STATUS_CHARGING;
+                else
+                        val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+                break;
+        case POWER_SUPPLY_PROP_PRESENT:
+                val->intval = !!(pbi->flags & PMU_BATT_PRESENT);
+                break;
+        case POWER_SUPPLY_PROP_MODEL_NAME:
+                val->strval = pmu_bat_get_model_name(pbi);
+                break;
+        case POWER_SUPPLY_PROP_ENERGY_AVG:
+                val->intval = pbi->charge     * 1000; /* mWh -> µWh */
+                break;
+        case POWER_SUPPLY_PROP_ENERGY_FULL:
+                val->intval = pbi->max_charge * 1000; /* mWh -> µWh */
+                break;
+        case POWER_SUPPLY_PROP_CURRENT_AVG:
+                val->intval = pbi->amperage   * 1000; /* mA -> µA */
+                break;
+        case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+                val->intval = pbi->voltage    * 1000; /* mV -> µV */
+                break;
+        case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
+                val->intval = pbi->time_remaining;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static enum power_supply_property pmu_bat_props[] = {
+        POWER_SUPPLY_PROP_STATUS,
+        POWER_SUPPLY_PROP_PRESENT,
+        POWER_SUPPLY_PROP_MODEL_NAME,
+        POWER_SUPPLY_PROP_ENERGY_AVG,
+        POWER_SUPPLY_PROP_ENERGY_FULL,
+        POWER_SUPPLY_PROP_CURRENT_AVG,
+        POWER_SUPPLY_PROP_VOLTAGE_AVG,
+        POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
+};
+
+/*********************************************************************
+ *              Initialisation
+ *********************************************************************/
+
+static struct platform_device *bat_pdev;
+
+static int __init pmu_bat_init(void)
+{
+        int ret;
+        int i;
+
+        bat_pdev = platform_device_register_simple("pmu-battery",
+                                                   0, NULL, 0);
+        if (IS_ERR(bat_pdev)) {
+                ret = PTR_ERR(bat_pdev);
+                goto pdev_register_failed;
+        }
+
+        ret = power_supply_register(&bat_pdev->dev, &pmu_ac);
+        if (ret)
+                goto ac_register_failed;
+
+        for (i = 0; i < pmu_battery_count; i++) {
+                struct pmu_battery_dev *pbat = kzalloc(sizeof(*pbat),
+                                                       GFP_KERNEL);
+                if (!pbat)
+                        break;
+
+                sprintf(pbat->name, "PMU battery %d", i);
+                pbat->bat.name = pbat->name;
+                pbat->bat.properties = pmu_bat_props;
+                pbat->bat.num_properties = ARRAY_SIZE(pmu_bat_props);
+                pbat->bat.get_property = pmu_bat_get_property;
+                pbat->pbi = &pmu_batteries[i];
+
+                ret = power_supply_register(&bat_pdev->dev, &pbat->bat);
+                if (ret) {
+                        kfree(pbat);
+                        goto battery_register_failed;
+                }
+                pbats[i] = pbat;
+        }
+
+        goto success;
+
+battery_register_failed:
+        while (i--) {
+                if (!pbats[i])
+                        continue;
+                power_supply_unregister(&pbats[i]->bat);
+                kfree(pbats[i]);
+        }
+        power_supply_unregister(&pmu_ac);
+ac_register_failed:
+        platform_device_unregister(bat_pdev);
+pdev_register_failed:
+success:
+        return ret;
+}
+
+static void __exit pmu_bat_exit(void)
+{
+        int i;
+
+        for (i = 0; i < PMU_MAX_BATTERIES; i++) {
+                if (!pbats[i])
+                        continue;
+                power_supply_unregister(&pbats[i]->bat);
+                kfree(pbats[i]);
+        }
+        power_supply_unregister(&pmu_ac);
+        platform_device_unregister(bat_pdev);
+
+        return;
+}
+
+module_init(pmu_bat_init);
+module_exit(pmu_bat_exit);
+
+MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("PMU battery driver");