drivers/gpio/gpio-zynqmp-modepin.c

3  * Driver for the ps-mode pin configuration.
22  * modepin_gpio_get_value - Get the state of the specified pin of GPIO device
24  * @pin:	gpio pin number within the device
26  * This function reads the state of the specified pin of the GPIO device.
28  * Return: 0 if the pin is low, 1 if pin is high, -EINVAL wrong pin configured
31 static int modepin_gpio_get_value(struct gpio_chip *chip, unsigned int pin)
43 	if (regval & BIT(pin))
44 		return !!(regval & BIT(pin + 8));
46 		return !!(regval & BIT(pin + 4));
50  * modepin_gpio_set_value - Modify the state of the pin with specified value
52  * @pin:	gpio pin number within the device
53  * @state:	value used to modify the state of the specified pin
55  * This function reads the state of the specified pin of the GPIO device, mask
56  * with the capture state of GPIO pin, and update pin of GPIO device.
60 static void modepin_gpio_set_value(struct gpio_chip *chip, unsigned int pin,
68 	/* Configure pin as an output by set bit [0:3] */
69 	bootpin_val |= BIT(pin);
72 		bootpin_val |= BIT(pin + 8);
74 		bootpin_val &= ~BIT(pin + 8);
79 		pr_err("modepin: set value error %d for pin %d\n", ret, pin);
83  * modepin_gpio_dir_in - Set the direction of the specified GPIO pin as input
85  * @pin:	gpio pin number within the device
89 static int modepin_gpio_dir_in(struct gpio_chip *chip, unsigned int pin)
95  * modepin_gpio_dir_out - Set the direction of the specified GPIO pin as output
97  * @pin:	gpio pin number within the device
98  * @state:	value to be written to specified pin
102 static int modepin_gpio_dir_out(struct gpio_chip *chip, unsigned int pin,