From 1986c4ca0b250c83434aae985e74e05f96ccb1a4 Mon Sep 17 00:00:00 2001 From: Chen-Yu Tsai Date: Mon, 9 Mar 2015 15:44:15 +0800 Subject: sunxi: axp221: Add VBUS detection support Some of the AXP PMICs support VBUS detection, i.e. checking whether VBUS power input is available and usable (supplied by an external source). A few boards use this instead of a separate GPIO to detect VBUS on USB OTG. Signed-off-by: Chen-Yu Tsai Acked-by: Hans de Goede Signed-off-by: Hans de Goede --- drivers/power/axp221.c | 16 ++++++++++++++++ include/axp221.h | 7 +++++++ 2 files changed, 23 insertions(+) diff --git a/drivers/power/axp221.c b/drivers/power/axp221.c index 3e07f23c20..c2c3988804 100644 --- a/drivers/power/axp221.c +++ b/drivers/power/axp221.c @@ -385,6 +385,22 @@ int axp221_get_sid(unsigned int *sid) return 0; } +int axp_get_vbus(void) +{ + int ret; + u8 val; + + ret = axp221_init(); + if (ret) + return ret; + + ret = pmic_bus_read(AXP221_POWER_STATUS, &val); + if (ret) + return ret; + + return (val & AXP221_POWER_STATUS_VBUS_USABLE) ? 1 : 0; +} + static int axp_drivebus_setup(void) { int ret; diff --git a/include/axp221.h b/include/axp221.h index a20e25c2f8..be6058e439 100644 --- a/include/axp221.h +++ b/include/axp221.h @@ -14,6 +14,9 @@ #define AXP223_RUNTIME_ADDR 0x2d /* Page 0 addresses */ +#define AXP221_POWER_STATUS 0x00 +#define AXP221_POWER_STATUS_VBUS_AVAIL (1 << 5) +#define AXP221_POWER_STATUS_VBUS_USABLE (1 << 4) #define AXP221_CHIP_ID 0x03 #define AXP221_OUTPUT_CTRL1 0x10 #define AXP221_OUTPUT_CTRL1_DCDC0_EN (1 << 0) @@ -59,6 +62,9 @@ /* Page 1 addresses */ #define AXP221_SID 0x20 +/* We support vbus detection */ +#define AXP_VBUS_DETECT + /* We support drivebus control */ #define AXP_DRIVEBUS @@ -77,5 +83,6 @@ int axp221_set_aldo3(unsigned int mvolt); int axp221_set_eldo(int eldo_num, unsigned int mvolt); int axp221_init(void); int axp221_get_sid(unsigned int *sid); +int axp_get_vbus(void); int axp_drivebus_enable(void); int axp_drivebus_disable(void); -- cgit v1.2.1