diff options
Diffstat (limited to 'drivers/gpio/gpiolib.c')
| -rw-r--r-- | drivers/gpio/gpiolib.c | 89 |
1 files changed, 76 insertions, 13 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 83e85dbfdeed..ae758ba6dc3d 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -2564,7 +2564,7 @@ EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); * rely on gpio_request() having been called beforehand. */ -static int gpio_do_set_config(struct gpio_desc *desc, unsigned long config) +int gpio_do_set_config(struct gpio_desc *desc, unsigned long config) { int ret; @@ -2670,9 +2670,15 @@ static int gpio_set_bias(struct gpio_desc *desc) */ int gpio_set_debounce_timeout(struct gpio_desc *desc, unsigned int debounce) { - return gpio_set_config_with_argument_optional(desc, - PIN_CONFIG_INPUT_DEBOUNCE, - debounce); + int ret; + + ret = gpio_set_config_with_argument_optional(desc, + PIN_CONFIG_INPUT_DEBOUNCE, + debounce); + if (!ret) + gpiod_line_state_notify(desc, GPIO_V2_LINE_CHANGED_CONFIG); + + return ret; } /** @@ -2687,6 +2693,18 @@ int gpio_set_debounce_timeout(struct gpio_desc *desc, unsigned int debounce) */ int gpiod_direction_input(struct gpio_desc *desc) { + int ret; + + ret = gpiod_direction_input_nonotify(desc); + if (ret == 0) + gpiod_line_state_notify(desc, GPIO_V2_LINE_CHANGED_CONFIG); + + return ret; +} +EXPORT_SYMBOL_GPL(gpiod_direction_input); + +int gpiod_direction_input_nonotify(struct gpio_desc *desc) +{ int ret = 0; VALIDATE_DESC(desc); @@ -2733,7 +2751,6 @@ int gpiod_direction_input(struct gpio_desc *desc) return ret; } -EXPORT_SYMBOL_GPL(gpiod_direction_input); static int gpiod_direction_output_raw_commit(struct gpio_desc *desc, int value) { @@ -2795,8 +2812,15 @@ static int gpiod_direction_output_raw_commit(struct gpio_desc *desc, int value) */ int gpiod_direction_output_raw(struct gpio_desc *desc, int value) { + int ret; + VALIDATE_DESC(desc); - return gpiod_direction_output_raw_commit(desc, value); + + ret = gpiod_direction_output_raw_commit(desc, value); + if (ret == 0) + gpiod_line_state_notify(desc, GPIO_V2_LINE_CHANGED_CONFIG); + + return ret; } EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); @@ -2815,6 +2839,18 @@ EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); */ int gpiod_direction_output(struct gpio_desc *desc, int value) { + int ret; + + ret = gpiod_direction_output_nonotify(desc, value); + if (ret == 0) + gpiod_line_state_notify(desc, GPIO_V2_LINE_CHANGED_CONFIG); + + return ret; +} +EXPORT_SYMBOL_GPL(gpiod_direction_output); + +int gpiod_direction_output_nonotify(struct gpio_desc *desc, int value) +{ unsigned long flags; int ret; @@ -2843,7 +2879,7 @@ int gpiod_direction_output(struct gpio_desc *desc, int value) goto set_output_value; /* Emulate open drain by not actively driving the line high */ if (value) { - ret = gpiod_direction_input(desc); + ret = gpiod_direction_input_nonotify(desc); goto set_output_flag; } } else if (test_bit(FLAG_OPEN_SOURCE, &flags)) { @@ -2852,7 +2888,7 @@ int gpiod_direction_output(struct gpio_desc *desc, int value) goto set_output_value; /* Emulate open source by not actively driving the line low */ if (!value) { - ret = gpiod_direction_input(desc); + ret = gpiod_direction_input_nonotify(desc); goto set_output_flag; } } else { @@ -2876,7 +2912,6 @@ set_output_flag: set_bit(FLAG_IS_OUT, &desc->flags); return ret; } -EXPORT_SYMBOL_GPL(gpiod_direction_output); /** * gpiod_enable_hw_timestamp_ns - Enable hardware timestamp in nanoseconds. @@ -2955,9 +2990,30 @@ EXPORT_SYMBOL_GPL(gpiod_disable_hw_timestamp_ns); */ int gpiod_set_config(struct gpio_desc *desc, unsigned long config) { + int ret; + VALIDATE_DESC(desc); - return gpio_do_set_config(desc, config); + ret = gpio_do_set_config(desc, config); + if (!ret) { + /* These are the only options we notify the userspace about. */ + switch (pinconf_to_config_param(config)) { + case PIN_CONFIG_BIAS_DISABLE: + case PIN_CONFIG_BIAS_PULL_DOWN: + case PIN_CONFIG_BIAS_PULL_UP: + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + case PIN_CONFIG_DRIVE_OPEN_SOURCE: + case PIN_CONFIG_DRIVE_PUSH_PULL: + case PIN_CONFIG_INPUT_DEBOUNCE: + gpiod_line_state_notify(desc, + GPIO_V2_LINE_CHANGED_CONFIG); + break; + default: + break; + } + } + + return ret; } EXPORT_SYMBOL_GPL(gpiod_set_config); @@ -3024,6 +3080,7 @@ void gpiod_toggle_active_low(struct gpio_desc *desc) { VALIDATE_DESC_VOID(desc); change_bit(FLAG_ACTIVE_LOW, &desc->flags); + gpiod_line_state_notify(desc, GPIO_V2_LINE_CHANGED_CONFIG); } EXPORT_SYMBOL_GPL(gpiod_toggle_active_low); @@ -3668,9 +3725,15 @@ EXPORT_SYMBOL_GPL(gpiod_cansleep); */ int gpiod_set_consumer_name(struct gpio_desc *desc, const char *name) { + int ret; + VALIDATE_DESC(desc); - return desc_set_label(desc, name); + ret = desc_set_label(desc, name); + if (ret == 0) + gpiod_line_state_notify(desc, GPIO_V2_LINE_CHANGED_CONFIG); + + return ret; } EXPORT_SYMBOL_GPL(gpiod_set_consumer_name); @@ -4548,10 +4611,10 @@ int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, /* Process flags */ if (dflags & GPIOD_FLAGS_BIT_DIR_OUT) - ret = gpiod_direction_output(desc, + ret = gpiod_direction_output_nonotify(desc, !!(dflags & GPIOD_FLAGS_BIT_DIR_VAL)); else - ret = gpiod_direction_input(desc); + ret = gpiod_direction_input_nonotify(desc); return ret; } |