power_supply: Add test_power driver

Just a handy driver that is used for testing purposes.

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

3 files changed, 169 insertions, 0 deletions

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index c59bcb7c6eb0..8e9ba177d817 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -57,6 +57,11 @@ config WM8350_POWER
           Say Y here to enable support for the power management unit
           provided by the Wolfson Microelectronics WM8350 PMIC.
 
+config TEST_POWER
+        tristate "Test power driver"
+        help
+          This driver is used for testing. It's safe to say M here.
+
 config BATTERY_DS2760
         tristate "DS2760 battery driver (HP iPAQ & others)"
         select W1
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index a82f292e5c94..00050809a6c7 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_MAX8925_POWER)	+= max8925_power.o
 obj-$(CONFIG_WM831X_BACKUP)     += wm831x_backup.o
 obj-$(CONFIG_WM831X_POWER)      += wm831x_power.o
 obj-$(CONFIG_WM8350_POWER)      += wm8350_power.o
+obj-$(CONFIG_TEST_POWER)        += test_power.o
 
 obj-$(CONFIG_BATTERY_DS2760)    += ds2760_battery.o
 obj-$(CONFIG_BATTERY_DS2782)    += ds2782_battery.o
diff --git a/drivers/power/test_power.c b/drivers/power/test_power.c
new file mode 100644
index 000000000000..0cd9f67d33e5
--- /dev/null
+++ b/drivers/power/test_power.c
@@ -0,0 +1,163 @@
+/*
+ * Power supply driver for testing.
+ *
+ * Copyright 2010  Anton Vorontsov <cbouatmailru@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/errno.h>
+#include <linux/delay.h>
+#include <linux/vermagic.h>
+
+static int test_power_ac_online = 1;
+static int test_power_battery_status = POWER_SUPPLY_STATUS_CHARGING;
+
+static int test_power_get_ac_property(struct power_supply *psy,
+                                      enum power_supply_property psp,
+                                      union power_supply_propval *val)
+{
+        switch (psp) {
+        case POWER_SUPPLY_PROP_ONLINE:
+                val->intval = test_power_ac_online;
+                break;
+        default:
+                return -EINVAL;
+        }
+        return 0;
+}
+
+static int test_power_get_battery_property(struct power_supply *psy,
+                                           enum power_supply_property psp,
+                                           union power_supply_propval *val)
+{
+        switch (psp) {
+        case POWER_SUPPLY_PROP_MODEL_NAME:
+                val->strval = "Test battery";
+                break;
+        case POWER_SUPPLY_PROP_MANUFACTURER:
+                val->strval = "Linux";
+                break;
+        case POWER_SUPPLY_PROP_SERIAL_NUMBER:
+                val->strval = UTS_RELEASE;
+                break;
+        case POWER_SUPPLY_PROP_STATUS:
+                val->intval = test_power_battery_status;
+                break;
+        case POWER_SUPPLY_PROP_CHARGE_TYPE:
+                val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
+                break;
+        case POWER_SUPPLY_PROP_HEALTH:
+                val->intval = POWER_SUPPLY_HEALTH_GOOD;
+                break;
+        case POWER_SUPPLY_PROP_TECHNOLOGY:
+                val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+                break;
+        case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
+                val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
+                break;
+        case POWER_SUPPLY_PROP_CAPACITY:
+                val->intval = 50;
+                break;
+        case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
+        case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
+                val->intval = 3600;
+                break;
+        default:
+                pr_info("%s: some properties deliberately report errors.\n",
+                        __func__);
+                return -EINVAL;
+        }
+        return 0;
+}
+
+static enum power_supply_property test_power_ac_props[] = {
+        POWER_SUPPLY_PROP_ONLINE,
+};
+
+static enum power_supply_property test_power_battery_props[] = {
+        POWER_SUPPLY_PROP_STATUS,
+        POWER_SUPPLY_PROP_CHARGE_TYPE,
+        POWER_SUPPLY_PROP_HEALTH,
+        POWER_SUPPLY_PROP_TECHNOLOGY,
+        POWER_SUPPLY_PROP_CHARGE_FULL,
+        POWER_SUPPLY_PROP_CHARGE_EMPTY,
+        POWER_SUPPLY_PROP_CAPACITY,
+        POWER_SUPPLY_PROP_CAPACITY_LEVEL,
+        POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
+        POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
+        POWER_SUPPLY_PROP_MODEL_NAME,
+        POWER_SUPPLY_PROP_MANUFACTURER,
+        POWER_SUPPLY_PROP_SERIAL_NUMBER,
+};
+
+static char *test_power_ac_supplied_to[] = {
+        "test_battery",
+};
+
+static struct power_supply test_power_supplies[] = {
+        {
+                .name = "test_ac",
+                .type = POWER_SUPPLY_TYPE_MAINS,
+                .supplied_to = test_power_ac_supplied_to,
+                .num_supplicants = ARRAY_SIZE(test_power_ac_supplied_to),
+                .properties = test_power_ac_props,
+                .num_properties = ARRAY_SIZE(test_power_ac_props),
+                .get_property = test_power_get_ac_property,
+        }, {
+                .name = "test_battery",
+                .type = POWER_SUPPLY_TYPE_BATTERY,
+                .properties = test_power_battery_props,
+                .num_properties = ARRAY_SIZE(test_power_battery_props),
+                .get_property = test_power_get_battery_property,
+        },
+};
+
+static int __init test_power_init(void)
+{
+        int i;
+        int ret;
+
+        for (i = 0; i < ARRAY_SIZE(test_power_supplies); i++) {
+                ret = power_supply_register(NULL, &test_power_supplies[i]);
+                if (ret) {
+                        pr_err("%s: failed to register %s\n", __func__,
+                                test_power_supplies[i].name);
+                        goto failed;
+                }
+        }
+
+        return 0;
+failed:
+        while (--i >= 0)
+                power_supply_unregister(&test_power_supplies[i]);
+        return ret;
+}
+module_init(test_power_init);
+
+static void __exit test_power_exit(void)
+{
+        int i;
+
+        /* Let's see how we handle changes... */
+        test_power_ac_online = 0;
+        test_power_battery_status = POWER_SUPPLY_STATUS_DISCHARGING;
+        for (i = 0; i < ARRAY_SIZE(test_power_supplies); i++)
+                power_supply_changed(&test_power_supplies[i]);
+        pr_info("%s: 'changed' event sent, sleeping for 10 seconds...\n",
+                __func__);
+        ssleep(10);
+
+        for (i = 0; i < ARRAY_SIZE(test_power_supplies); i++)
+                power_supply_unregister(&test_power_supplies[i]);
+}
+module_exit(test_power_exit);
+
+MODULE_DESCRIPTION("Power supply driver for testing");
+MODULE_AUTHOR("Anton Vorontsov <cbouatmailru@gmail.com>");
+MODULE_LICENSE("GPL");