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Subject[PATCH 3/3] power: of battery: Initial support for of-based battery specification driver.
Date
This driver supports battery specification through the generic interface of
power_supply subsystem. All data are parsed from device tree and it exactly
matches with power_supply_info's content.

Signed-off-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
---
.../bindings/power_supply/of_battery.txt | 34 +++++++
drivers/power/Kconfig | 7 ++
drivers/power/Makefile | 1 +
drivers/power/of_battery.c | 100 ++++++++++++++++++++
4 files changed, 142 insertions(+)
create mode 100644 Documentation/devicetree/bindings/power_supply/of_battery.txt
create mode 100644 drivers/power/of_battery.c

diff --git a/Documentation/devicetree/bindings/power_supply/of_battery.txt b/Documentation/devicetree/bindings/power_supply/of_battery.txt
new file mode 100644
index 0000000..5ccd2a1
--- /dev/null
+++ b/Documentation/devicetree/bindings/power_supply/of_battery.txt
@@ -0,0 +1,34 @@
+of_battery bindings
+~~~~~~~~~~~~~~~~~~~
+
+This documentation describes how to define data in device tree
+to use of_battery driver. All properties are just matched with
+power_supply_info's.
+
+Required properties :
+ - battery-name : battery's name for identifying.
+
+Optional properties :
+ - voltage_max : Maximum voltage of the battery (uV).
+ - voltage_min : Minimum voltage of the battery (uV).
+ - charge_full : Full capacity of the battery (uAh).
+ - charge_empty : Empty capacity of the battery (uAh).
+ - energy_full : Full capacity of the battery (uWh).
+ - energy_empty : Empty capacity of the battery (uWh).
+ - temperature_max : Maximum temperature for the battery (deci 'C)
+ - temperature_min : Minium temperature for the battery (deci 'C)
+
+Example:
+ battery {
+ main-battery {
+ battery-name = "battery";
+ voltage-max = <4350000>;
+ charge-full = <2500000>;
+ temperature_max = <600>;
+ temperature_min = <(-100)>;
+ };
+ backup-battery {
+ battery-name = "coin-battery";
+ voltage-max = <3000000>;
+ };
+ };
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 73cfcdf..c324ac6 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -36,6 +36,13 @@ config GENERIC_ADC_BATTERY
Say Y here to enable support for the generic battery driver
which uses IIO framework to read adc.

+config BATTERY_OF
+ tristate "Generic of-based battery specification driver"
+ depends on OF
+ help
+ Say Y here to enable support for the of-based generic battery
+ specification driver which gives static battery data.
+
config MAX8925_POWER
tristate "MAX8925 battery charger support"
depends on MFD_MAX8925
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index dfa8942..38a83aa 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -6,6 +6,7 @@ power_supply-$(CONFIG_LEDS_TRIGGERS) += power_supply_leds.o

obj-$(CONFIG_POWER_SUPPLY) += power_supply.o
obj-$(CONFIG_GENERIC_ADC_BATTERY) += generic-adc-battery.o
+obj-$(CONFIG_BATTERY_OF) += of_battery.o

obj-$(CONFIG_PDA_POWER) += pda_power.o
obj-$(CONFIG_APM_POWER) += apm_power.o
diff --git a/drivers/power/of_battery.c b/drivers/power/of_battery.c
new file mode 100644
index 0000000..3c66765
--- /dev/null
+++ b/drivers/power/of_battery.c
@@ -0,0 +1,100 @@
+/*
+ * OF-based battery specification driver
+ *
+ * This driver supports generic interface to get static battery data.
+ *
+ * Copyright © 2014 Jonghwa Lee <jonghwa3.lee@samsung.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.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/power_supply.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+
+static struct power_supply_info *of_get_battery_info(struct device_node *np)
+{
+ struct power_supply_info *info;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return ERR_PTR(-ENOMEM);
+
+ if (of_property_read_string(np, "battery-name", &info->name)) {
+ kfree(info);
+ return ERR_PTR(-EINVAL);
+ }
+
+ of_property_read_u32(np, "voltage_max", &info->voltage_max_design);
+ of_property_read_u32(np, "voltage_min", &info->voltage_min_design);
+ of_property_read_u32(np, "charge_full", &info->charge_full_design);
+ of_property_read_u32(np, "charge_empty", &info->charge_empty_design);
+ of_property_read_u32(np, "energy_full", &info->energy_full_design);
+ of_property_read_u32(np, "energy_empty", &info->energy_empty_design);
+ of_property_read_u32(np, "temperature_max", &info->temperature_max);
+ of_property_read_u32(np, "temperature_min", &info->temperature_min);
+
+ return info;
+}
+
+static int __init psy_of_battery_init(void)
+{
+ struct power_supply_info *info;
+ struct device_node *np, *child;
+ int ret;
+
+ np = of_find_node_by_name(NULL, "battery");
+ if (!np)
+ return -ENODEV;
+
+ for_each_child_of_node(np, child) {
+ info = of_get_battery_info(child);
+ if (IS_ERR(info)) {
+ pr_err("Failed to get battery information (%ld)\n",
+ PTR_ERR(info));
+ continue;
+ }
+ ret = psy_register_battery_info(info);
+ if (ret) {
+ pr_err("Failed to register battery information (%d)\n",
+ ret);
+ kfree(info);
+ continue;
+ }
+ }
+
+ return 0;
+}
+module_init(psy_of_battery_init);
+
+static void __exit psy_of_battery_exit(void)
+{
+ struct power_supply_info *info;
+ struct device_node *np, *child;
+ const char *name;
+
+ np = of_find_node_by_name(NULL, "battery");
+ if (!np)
+ return;
+
+ for_each_child_of_node(np, child) {
+ if (!of_property_read_string(np, "battery-name", &name))
+ continue;
+
+ info = psy_get_battery_info(name);
+ if (IS_ERR(info))
+ continue;
+
+ psy_unregister_battery_info(info);
+ }
+}
+module_exit(psy_of_battery_exit);
+
+MODULE_AUTHOR("Jonghwa Lee <jonhgwa3.lee@samsung.com>");
+MODULE_DESCRIPTION("of battery specification driver");
+MODULE_LICENSE("GPL");
--
1.7.9.5
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