diff options
Diffstat (limited to 'drivers/gpio/gpiolib.h')
| -rw-r--r-- | drivers/gpio/gpiolib.h | 79 |
1 files changed, 66 insertions, 13 deletions
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h index 99ed3b00ffe9..e30e5fdb1214 100644 --- a/drivers/gpio/gpiolib.h +++ b/drivers/gpio/gpiolib.h @@ -12,14 +12,67 @@ #ifndef GPIOLIB_H #define GPIOLIB_H +#include <linux/gpio/driver.h> #include <linux/err.h> #include <linux/device.h> +#include <linux/module.h> +#include <linux/cdev.h> enum of_gpio_flags; enum gpiod_flags; struct acpi_device; /** + * struct gpio_device - internal state container for GPIO devices + * @id: numerical ID number for the GPIO chip + * @dev: the GPIO device struct + * @chrdev: character device for the GPIO device + * @mockdev: class device used by the deprecated sysfs interface (may be + * NULL) + * @owner: helps prevent removal of modules exporting active GPIOs + * @chip: pointer to the corresponding gpiochip, holding static + * data for this device + * @descs: array of ngpio descriptors. + * @ngpio: the number of GPIO lines on this GPIO device, equal to the size + * of the @descs array. + * @base: GPIO base in the DEPRECATED global Linux GPIO numberspace, assigned + * at device creation time. + * @label: a descriptive name for the GPIO device, such as the part number + * or name of the IP component in a System on Chip. + * @data: per-instance data assigned by the driver + * @list: links gpio_device:s together for traversal + * + * This state container holds most of the runtime variable data + * for a GPIO device and can hold references and live on after the + * GPIO chip has been removed, if it is still being used from + * userspace. + */ +struct gpio_device { + int id; + struct device dev; + struct cdev chrdev; + struct device *mockdev; + struct module *owner; + struct gpio_chip *chip; + struct gpio_desc *descs; + int base; + u16 ngpio; + char *label; + void *data; + struct list_head list; + +#ifdef CONFIG_PINCTRL + /* + * If CONFIG_PINCTRL is enabled, then gpio controllers can optionally + * describe the actual pin range which they serve in an SoC. This + * information would be used by pinctrl subsystem to configure + * corresponding pins for gpio usage. + */ + struct list_head pin_ranges; +#endif +}; + +/** * struct acpi_gpio_info - ACPI GPIO specific information * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo * @active_low: in case of @gpioint, the pin is active low @@ -90,10 +143,10 @@ struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np, struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum); extern struct spinlock gpio_lock; -extern struct list_head gpio_chips; +extern struct list_head gpio_devices; struct gpio_desc { - struct gpio_chip *chip; + struct gpio_device *gdev; unsigned long flags; /* flag symbols are bit numbers */ #define FLAG_REQUESTED 0 @@ -122,7 +175,7 @@ int gpiod_hog(struct gpio_desc *desc, const char *name, */ static int __maybe_unused gpio_chip_hwgpio(const struct gpio_desc *desc) { - return desc - &desc->chip->desc[0]; + return desc - &desc->gdev->descs[0]; } /* With descriptor prefix */ @@ -149,31 +202,31 @@ static int __maybe_unused gpio_chip_hwgpio(const struct gpio_desc *desc) /* With chip prefix */ #define chip_emerg(chip, fmt, ...) \ - pr_emerg("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) + dev_emerg(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__) #define chip_crit(chip, fmt, ...) \ - pr_crit("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) + dev_crit(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__) #define chip_err(chip, fmt, ...) \ - pr_err("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) + dev_err(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__) #define chip_warn(chip, fmt, ...) \ - pr_warn("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) + dev_warn(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__) #define chip_info(chip, fmt, ...) \ - pr_info("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) + dev_info(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__) #define chip_dbg(chip, fmt, ...) \ - pr_debug("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) + dev_dbg(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__) #ifdef CONFIG_GPIO_SYSFS -int gpiochip_sysfs_register(struct gpio_chip *chip); -void gpiochip_sysfs_unregister(struct gpio_chip *chip); +int gpiochip_sysfs_register(struct gpio_device *gdev); +void gpiochip_sysfs_unregister(struct gpio_device *gdev); #else -static inline int gpiochip_sysfs_register(struct gpio_chip *chip) +static inline int gpiochip_sysfs_register(struct gpio_device *gdev) { return 0; } -static inline void gpiochip_sysfs_unregister(struct gpio_chip *chip) +static inline void gpiochip_sysfs_unregister(struct gpio_device *gdev) { } |