shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-07 19:30:30 +09:00
Code Issues Packages Projects Releases Wiki Activity

mfd: fusb302: add gpio control vbus discharge

Browse Source 
When type-c vbus output power down or disconnect charging input, the
type-c vbus voltage discharge to 0V take a long time, during this time
residual voltage would affect charge circuit in some platforms（e.g.
rk3399-tve1205g board）. So we need add fast discharge circuit, then use
a gpio control it.

Change-Id: I4c8eebc0cf10c6c38c7db9d9d5c71c4f6769e7fc
Signed-off-by: Bin Yang <yangbin@rock-chips.com>
This commit is contained in:
Bin Yang
2017-01-04 08:55:26 +08:00
committed by Huang, Tao
parent 68042b0634
commit 121db2e38e
2 changed files with 36 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/mfd/fusb302.c
View File

@@ -300,6 +300,9 @@ static void fusb_timer_start(struct hrtimer *timer, int ms)
static void platform_set_vbus_lvl_enable(struct fusb30x_chip *chip, int vbus_5v,
int vbus_other)
{
bool gpio_vbus_value = 0;
gpio_vbus_value = gpiod_get_value(chip->gpio_vbus_5v);
if (chip->gpio_vbus_5v) {
gpiod_set_raw_value(chip->gpio_vbus_5v, vbus_5v);
/* Only set state here, don't sync notifier to PMIC */
@@ -312,6 +315,12 @@ static void platform_set_vbus_lvl_enable(struct fusb30x_chip *chip, int vbus_5v,
if (chip->gpio_vbus_other)
gpiod_set_raw_value(chip->gpio_vbus_5v, vbus_other);
if (chip->gpio_discharge && !vbus_5v && gpio_vbus_value) {
gpiod_set_value(chip->gpio_discharge, 1);
msleep(20);
gpiod_set_value(chip->gpio_discharge, 0);
}
}
static void set_state(struct fusb30x_chip *chip, enum connection_state state)
@@ -786,7 +795,11 @@ static void set_state_unattached(struct fusb30x_chip *chip)
memset(&chip->notify, 0, sizeof(struct notify_info));
platform_fusb_notify(chip);
if (chip->gpio_discharge)
gpiod_set_value(chip->gpio_discharge, 1);
msleep(100);
if (chip->gpio_discharge)
gpiod_set_value(chip->gpio_discharge, 0);
}
static int tcpm_check_vbus(struct fusb30x_chip *chip)
@@ -2278,6 +2291,14 @@ static int fusb_initialize_gpio(struct fusb30x_chip *chip)
else
gpiod_set_raw_value(chip->gpio_vbus_other, 0);
chip->gpio_discharge = devm_gpiod_get_optional(chip->dev, "discharge",
GPIOD_OUT_LOW);
if (IS_ERR(chip->gpio_discharge)) {
dev_warn(chip->dev,
"Could not get named GPIO for discharge!\n");
chip->gpio_discharge = NULL;
}
return 0;
}
@@ -2503,6 +2524,19 @@ static int fusb30x_remove(struct i2c_client *client)
return 0;
}
static void fusb30x_shutdown(struct i2c_client *client)
{
struct fusb30x_chip *chip = i2c_get_clientdata(client);
if (chip->gpio_vbus_5v)
gpiod_set_value(chip->gpio_vbus_5v, 0);
if (chip->gpio_discharge) {
gpiod_set_value(chip->gpio_discharge, 1);
msleep(100);
gpiod_set_value(chip->gpio_discharge, 0);
}
}
static const struct of_device_id fusb30x_dt_match[] = {
{ .compatible = FUSB30X_I2C_DEVICETREE_NAME },
{},
@@ -2522,6 +2556,7 @@ static struct i2c_driver fusb30x_driver = {
},
.probe = fusb30x_probe,
.remove = fusb30x_remove,
.shutdown = fusb30x_shutdown,
.id_table = fusb30x_i2c_device_id,
};

1
drivers/mfd/fusb302.h
View File

@@ -378,6 +378,7 @@ struct fusb30x_chip {
struct gpio_desc *gpio_vbus_5v;
struct gpio_desc *gpio_vbus_other;
struct gpio_desc *gpio_int;
struct gpio_desc *gpio_discharge;
int timer_state;
int timer_mux;
int port_num;