From 6afb7d88356ab738bb469850854df6c4c31f3f3f Mon Sep 17 00:00:00 2001 From: Paul Fertser Date: Wed, 4 Nov 2009 14:27:52 +0300 Subject: [PATCH 30/69] gta02: add support for platform_battery This adds support for platform_battery driver which allows to specify a set of power supply properties and callbacks to acquire them. It is needed to support dumb batteries where all the information about their status can only be obtained by platform-specific actions such as specific ADC measurements, some guessimation etc. Signed-off-by: Paul Fertser --- arch/arm/mach-s3c2440/mach-gta02.c | 113 ++++++++++++++++++++++++++++++++++++ 1 files changed, 113 insertions(+), 0 deletions(-) diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c index cf1b8ee..aa31b8d 100644 --- a/arch/arm/mach-s3c2440/mach-gta02.c +++ b/arch/arm/mach-s3c2440/mach-gta02.c @@ -104,6 +104,7 @@ #include #include +#include #include #include @@ -858,6 +859,117 @@ static struct platform_device bq27000_battery_device = { }, }; +/* Platform battery */ + +/* Capacity of a typical BL-5C dumb battery */ +#define GTA02_BAT_CHARGE_FULL 850000 + +static int gta02_bat_voltscale(int volt) +{ + /* This table is suggested by SpeedEvil based on analysis of + * experimental data */ + static const int lut[][2] = { + { 4120, 100 }, + { 3900, 60 }, + { 3740, 25 }, + { 3600, 5 }, + { 3000, 0 } }; + int i, res = 0; + + if (volt > lut[0][0]) + res = lut[0][1]; + else + for (i = 0; lut[i][1]; i++) { + if (volt <= lut[i][0] && volt >= lut[i+1][0]) { + res = lut[i][1] - (lut[i][0]-volt)* + (lut[i][1]-lut[i+1][1])/ + (lut[i][0]-lut[i+1][0]); + break; + } + } + return res; +} + +static int gta02_bat_get_voltage(void) +{ + struct pcf50633 *pcf = gta02_pcf; + u16 adc, mv = 0; + adc = pcf50633_adc_sync_read(pcf, + PCF50633_ADCC1_MUX_BATSNS_RES, + PCF50633_ADCC1_AVERAGE_16); + /* The formula from DS is for divide-by-two mode, current driver uses + divide-by-three */ + mv = (adc * 6000) / 1023; + return mv * 1000; +} + +static int gta02_bat_get_present(void) +{ + /* There is no reliable way to tell if it is present or not */ + return 1; +} + +static int gta02_bat_get_status(void) +{ +#ifdef CONFIG_CHARGER_PCF50633 + if (gta02_get_charger_active_status()) + return POWER_SUPPLY_STATUS_CHARGING; + else + return POWER_SUPPLY_STATUS_DISCHARGING; +#else + return POWER_SUPPLY_STATUS_UNKNOWN; +#endif +} + +static int gta02_bat_get_capacity(void) +{ + return gta02_bat_voltscale(gta02_bat_get_voltage()/1000); +} + +static int gta02_bat_get_charge_full(void) +{ + return GTA02_BAT_CHARGE_FULL; +} + +static int gta02_bat_get_charge_now(void) +{ + return gta02_bat_get_capacity() * gta02_bat_get_charge_full() / 100; +} + +static enum power_supply_property gta02_platform_bat_properties[] = { + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_CAPACITY, + POWER_SUPPLY_PROP_CHARGE_FULL, + POWER_SUPPLY_PROP_CHARGE_NOW, +}; + +int (*gta02_platform_bat_get_property[])(void) = { + gta02_bat_get_present, + gta02_bat_get_status, + gta02_bat_get_voltage, + gta02_bat_get_capacity, + gta02_bat_get_charge_full, + gta02_bat_get_charge_now, +}; + +static struct platform_bat_platform_data gta02_platform_bat_pdata = { + .name = "battery", + .properties = gta02_platform_bat_properties, + .num_properties = ARRAY_SIZE(gta02_platform_bat_properties), + .get_property = gta02_platform_bat_get_property, + .is_present = gta02_bat_get_present, +}; + +struct platform_device gta02_platform_bat = { + .name = "platform_battery", + .id = -1, + .dev = { + .platform_data = >a02_platform_bat_pdata, + } +}; + /* HDQ */ static void gta02_hdq_gpio_direction_out(void) @@ -940,6 +1052,7 @@ static struct platform_device *gta02_devices[] __initdata = { static struct platform_device *gta02_devices_pmu_children[] = { >a02_hdq_device, + >a02_platform_bat, }; -- 1.7.2.5