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authorBalaji T K <balajitk@ti.com>2010-11-25 16:22:04 +0530
committerSandeep Paulraj <s-paulraj@ti.com>2010-12-11 10:56:01 -0500
commit3e664f6d50ea7f5d6ea96a028fc8f099236e99be (patch)
tree032ec5be00d6b17bfc491e9cbc4d34ee0cd01a88 /drivers/power/twl6030.c
parent917a62c0d292d9da45100a76151a9fa2d13a9cdc (diff)
ARMV7: OMAP4: twl6030 add battery charging support
Add battery charging support twl6030 driver. Add support for battery voltage and current measurements. Add command to get battery status and start/stop battery charging from USB. Signed-off-by: Balaji T K <balajitk@ti.com> Tested-by: Steve Sakoman <steve.sakoman@linaro.org> Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
Diffstat (limited to 'drivers/power/twl6030.c')
-rw-r--r--drivers/power/twl6030.c124
1 files changed, 122 insertions, 2 deletions
diff --git a/drivers/power/twl6030.c b/drivers/power/twl6030.c
index cf1da6b6a2..fef57b4337 100644
--- a/drivers/power/twl6030.c
+++ b/drivers/power/twl6030.c
@@ -36,6 +36,54 @@ static inline int twl6030_i2c_read_u8(u8 chip_no, u8 *val, u8 reg)
return i2c_read(chip_no, reg, 1, val, 1);
}
+static int twl6030_gpadc_read_channel(u8 channel_no)
+{
+ u8 lsb = 0;
+ u8 msb = 0;
+ int ret = 0;
+
+ ret = twl6030_i2c_read_u8(TWL6030_CHIP_ADC, &lsb,
+ GPCH0_LSB + channel_no * 2);
+ if (ret)
+ return ret;
+
+ ret = twl6030_i2c_read_u8(TWL6030_CHIP_ADC, &msb,
+ GPCH0_MSB + channel_no * 2);
+ if (ret)
+ return ret;
+
+ return (msb << 8) | lsb;
+}
+
+static int twl6030_gpadc_sw2_trigger(void)
+{
+ u8 val;
+ int ret = 0;
+
+ ret = twl6030_i2c_write_u8(TWL6030_CHIP_ADC, CTRL_P2_SP2, CTRL_P2);
+ if (ret)
+ return ret;
+
+ /* Waiting until the SW1 conversion ends*/
+ val = CTRL_P2_BUSY;
+
+ while (!((val & CTRL_P2_EOCP2) && (!(val & CTRL_P2_BUSY)))) {
+ ret = twl6030_i2c_read_u8(TWL6030_CHIP_ADC, &val, CTRL_P2);
+ if (ret)
+ return ret;
+ udelay(1000);
+ }
+
+ return 0;
+}
+
+void twl6030_stop_usb_charging(void)
+{
+ twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, 0, CONTROLLER_CTRL1);
+
+ return;
+}
+
void twl6030_start_usb_charging(void)
{
twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CHARGERUSB_VICHRG_1500,
@@ -48,17 +96,89 @@ void twl6030_start_usb_charging(void)
CHARGERUSB_INT_MASK);
twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CHARGERUSB_VOREG_4P0,
CHARGERUSB_VOREG);
- twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CHARGERUSB_CTRL2_VITERM_100,
+ twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CHARGERUSB_CTRL2_VITERM_400,
CHARGERUSB_CTRL2);
+ twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, TERM, CHARGERUSB_CTRL1);
/* Enable USB charging */
twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CONTROLLER_CTRL1_EN_CHARGER,
CONTROLLER_CTRL1);
return;
}
+int twl6030_get_battery_current(void)
+{
+ int battery_current = 0;
+ u8 msb = 0;
+ u8 lsb = 0;
+
+ twl6030_i2c_read_u8(TWL6030_CHIP_CHARGER, &msb, FG_REG_11);
+ twl6030_i2c_read_u8(TWL6030_CHIP_CHARGER, &lsb, FG_REG_10);
+ battery_current = ((msb << 8) | lsb);
+
+ /* convert 10 bit signed number to 16 bit signed number */
+ if (battery_current >= 0x2000)
+ battery_current = (battery_current - 0x4000);
+
+ battery_current = battery_current * 3000 / 4096;
+ printf("Battery Current: %d mA\n", battery_current);
+
+ return battery_current;
+}
+
+int twl6030_get_battery_voltage(void)
+{
+ int battery_volt = 0;
+ int ret = 0;
+
+ /* Start GPADC SW conversion */
+ ret = twl6030_gpadc_sw2_trigger();
+ if (ret) {
+ printf("Failed to convert battery voltage\n");
+ return ret;
+ }
+
+ /* measure Vbat voltage */
+ battery_volt = twl6030_gpadc_read_channel(7);
+ if (battery_volt < 0) {
+ printf("Failed to read battery voltage\n");
+ return ret;
+ }
+ battery_volt = (battery_volt * 25 * 1000) >> (10 + 2);
+ printf("Battery Voltage: %d mV\n", battery_volt);
+
+ return battery_volt;
+}
+
void twl6030_init_battery_charging(void)
{
- twl6030_start_usb_charging();
+ u8 stat1 = 0;
+ int battery_volt = 0;
+ int ret = 0;
+
+ /* Enable VBAT measurement */
+ twl6030_i2c_write_u8(TWL6030_CHIP_PM, VBAT_MEAS, MISC1);
+
+ /* Enable GPADC module */
+ ret = twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, FGS | GPADCS, TOGGLE1);
+ if (ret) {
+ printf("Failed to enable GPADC\n");
+ return;
+ }
+
+ battery_volt = twl6030_get_battery_voltage();
+ if (battery_volt < 0)
+ return;
+
+ if (battery_volt < 3000)
+ printf("Main battery voltage too low!\n");
+
+ /* Check for the presence of USB charger */
+ twl6030_i2c_read_u8(TWL6030_CHIP_CHARGER, &stat1, CONTROLLER_STAT1);
+
+ /* check for battery presence indirectly via Fuel gauge */
+ if ((stat1 & VBUS_DET) && (battery_volt < 3300))
+ twl6030_start_usb_charging();
+
return;
}