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authorPaul Fertser <fercerpav@gmail.com>2009-11-04 14:27:52 +0300
committerLars-Peter Clausen <lars@metafoo.de>2010-05-18 00:53:35 +0200
commit7adce845dbe16c9d43e79358903679470c2d1edf (patch)
treec471b3f3a0b546cecfd899bded0778536931186d /arch/arm
parent6fbc374d90032ad76f6fd3556514e18bed573088 (diff)
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 <fercerpav@gmail.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/mach-s3c2440/mach-gta02.c113
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 3f1da153bd2..e8ac76bd17e 100644
--- a/arch/arm/mach-s3c2440/mach-gta02.c
+++ b/arch/arm/mach-s3c2440/mach-gta02.c
@@ -105,6 +105,7 @@
#include <linux/hdq.h>
#include <linux/bq27000_battery.h>
+#include <linux/platform_battery.h>
#include <linux/jbt6k74.h>
#include <linux/glamofb.h>
@@ -907,6 +908,117 @@ 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 = &gta02_platform_bat_pdata,
+ }
+};
+
/* HDQ */
static void gta02_hdq_gpio_direction_out(void)
@@ -987,6 +1099,7 @@ static struct platform_device *gta02_devices[] __initdata = {
static struct platform_device *gta02_devices_pmu_children[] = {
&gta02_hdq_device,
+ &gta02_platform_bat,
};
/*