* an error value of -1.
*/
+enum gpio_flags {
+ GPIOFLAG_INPUT,
+ GPIOFLAG_OUTPUT_INIT_LOW,
+ GPIOFLAG_OUTPUT_INIT_HIGH,
+};
+
+struct gpio {
+ unsigned int gpio;
+ enum gpio_flags flags;
+ const char *label;
+};
+
/**
- * Request a gpio. This should be called before any of the other functions
- * are used on this gpio.
+ * Request a GPIO. This should be called before any of the other functions
+ * are used on this GPIO.
+ *
+ * Note: With driver model, the label is allocated so there is no need for
+ * the caller to preserve it.
*
* @param gp GPIO number
* @param label User label for this GPIO
*/
int gpio_request(unsigned gpio, const char *label);
+/**
+ * Request a GPIO and configure it
+ * @param gpios pointer to array of gpio defs
+ * @param count number of GPIOs to set up
+ */
+int gpio_request_one(unsigned gpio, enum gpio_flags flags, const char *label);
+
+/**
+ * Request a set of GPIOs and configure them
+ * @param gpios pointer to array of gpio defs
+ * @param count number of GPIOs to set up
+ */
+int gpio_request_array(const struct gpio *gpios, int count);
+
/**
* Stop using the GPIO. This function should not alter pin configuration.
*
*/
int gpio_free(unsigned gpio);
+/**
+ * Release a set of GPIOs
+ * @param gpios pointer to array of gpio defs
+ * @param count number of GPIOs to set up
+ */
+int gpio_free_array(const struct gpio *gpios, int count);
+
/**
* Make a GPIO an input.
*
*/
int gpio_set_value(unsigned gpio, int value);
-/* State of a GPIO, as reported by get_state() */
-enum {
+/* State of a GPIO, as reported by get_function() */
+enum gpio_func_t {
GPIOF_INPUT = 0,
GPIOF_OUTPUT,
- GPIOF_UNKNOWN,
+ GPIOF_UNUSED, /* Not claimed */
+ GPIOF_UNKNOWN, /* Not known */
+ GPIOF_FUNC, /* Not used as a GPIO */
+
+ GPIOF_COUNT,
};
-struct device;
+struct udevice;
+
+/**
+ * gpio_get_status() - get the current GPIO status as a string
+ *
+ * Obtain the current GPIO status as a string which can be presented to the
+ * user. A typical string is:
+ *
+ * "b4: in: 1 [x] sdmmc_cd"
+ *
+ * which means this is GPIO bank b, offset 4, currently set to input, current
+ * value 1, [x] means that it is requested and the owner is 'sdmmc_cd'
+ *
+ * @dev: Device to check
+ * @offset: Offset of device GPIO to check
+ * @buf: Place to put string
+ * @buffsize: Size of string including \0
+ */
+int gpio_get_status(struct udevice *dev, int offset, char *buf, int buffsize);
+
+/**
+ * gpio_get_function() - get the current function for a GPIO pin
+ *
+ * Note this returns GPIOF_UNUSED if the GPIO is not requested.
+ *
+ * @dev: Device to check
+ * @offset: Offset of device GPIO to check
+ * @namep: If non-NULL, this is set to the nane given when the GPIO
+ * was requested, or -1 if it has not been requested
+ * @return -ENODATA if the driver returned an unknown function,
+ * -ENODEV if the device is not active, -EINVAL if the offset is invalid.
+ * GPIOF_UNUSED if the GPIO has not been requested. Otherwise returns the
+ * function from enum gpio_func_t.
+ */
+int gpio_get_function(struct udevice *dev, int offset, const char **namep);
+
+/**
+ * gpio_get_raw_function() - get the current raw function for a GPIO pin
+ *
+ * Note this does not return GPIOF_UNUSED - it will always return the GPIO
+ * driver's view of a pin function, even if it is not correctly set up.
+ *
+ * @dev: Device to check
+ * @offset: Offset of device GPIO to check
+ * @namep: If non-NULL, this is set to the nane given when the GPIO
+ * was requested, or -1 if it has not been requested
+ * @return -ENODATA if the driver returned an unknown function,
+ * -ENODEV if the device is not active, -EINVAL if the offset is invalid.
+ * Otherwise returns the function from enum gpio_func_t.
+ */
+int gpio_get_raw_function(struct udevice *dev, int offset, const char **namep);
+
+/**
+ * gpio_requestf() - request a GPIO using a format string for the owner
+ *
+ * This is a helper function for gpio_request(). It allows you to provide
+ * a printf()-format string for the GPIO owner. It calls gpio_request() with
+ * the string that is created
+ */
+int gpio_requestf(unsigned gpio, const char *fmt, ...)
+ __attribute__ ((format (__printf__, 2, 3)));
/**
* struct struct dm_gpio_ops - Driver model GPIO operations
* new DM GPIO API, this should be really easy to flip over to the Linux
* GPIO API-alike interface.
*
- * Akso it would be useful to standardise additional functions like
+ * Also it would be useful to standardise additional functions like
* pullup, slew rate and drive strength.
*
* gpio_request)( and gpio_free() are optional - if NULL then they will
* SoCs there may be many banks and therefore many devices all referring
* to the different IO addresses within the SoC.
*
- * The uclass combines all GPIO devices togther to provide a consistent
+ * The uclass combines all GPIO devices together to provide a consistent
* numbering from 0 to n-1, where n is the number of GPIOs in total across
* all devices. Be careful not to confuse offset with gpio in the parameters.
*/
struct dm_gpio_ops {
- int (*request)(struct device *dev, unsigned offset, const char *label);
- int (*free)(struct device *dev, unsigned offset);
- int (*direction_input)(struct device *dev, unsigned offset);
- int (*direction_output)(struct device *dev, unsigned offset,
+ int (*request)(struct udevice *dev, unsigned offset, const char *label);
+ int (*free)(struct udevice *dev, unsigned offset);
+ int (*direction_input)(struct udevice *dev, unsigned offset);
+ int (*direction_output)(struct udevice *dev, unsigned offset,
int value);
- int (*get_value)(struct device *dev, unsigned offset);
- int (*set_value)(struct device *dev, unsigned offset, int value);
- int (*get_function)(struct device *dev, unsigned offset);
- int (*get_state)(struct device *dev, unsigned offset, char *state,
- int maxlen);
+ int (*get_value)(struct udevice *dev, unsigned offset);
+ int (*set_value)(struct udevice *dev, unsigned offset, int value);
+ /**
+ * get_function() Get the GPIO function
+ *
+ * @dev: Device to check
+ * @offset: GPIO offset within that device
+ * @return current function - GPIOF_...
+ */
+ int (*get_function)(struct udevice *dev, unsigned offset);
};
/**
* struct gpio_dev_priv - information about a device used by the uclass
*
* The uclass combines all active GPIO devices into a unified numbering
- * scheme. To do this it maintains some private information aobut each
+ * scheme. To do this it maintains some private information about each
* device.
*
* To implement driver model support in your GPIO driver, add a probe
* @gpio_base: Base GPIO number for this device. For the first active device
* this will be 0; the numbering for others will follow sequentially so that
* @gpio_base for device 1 will equal the number of GPIOs in device 0.
+ * @name: Array of pointers to the name for each GPIO in this bank. The
+ * value of the pointer will be NULL if the GPIO has not been claimed.
*/
struct gpio_dev_priv {
const char *bank_name;
unsigned gpio_count;
unsigned gpio_base;
+ char **name;
};
/* Access the GPIO operations for a device */
* @offset_count: Returns number of GPIOs within this bank
* @return bank name of this device
*/
-const char *gpio_get_bank_info(struct device *dev, int *offset_count);
+const char *gpio_get_bank_info(struct udevice *dev, int *offset_count);
/**
* gpio_lookup_name - Look up a GPIO name and return its details
* @offsetp: Returns the offset number within this device
* @gpiop: Returns the absolute GPIO number, numbered from 0
*/
-int gpio_lookup_name(const char *name, struct device **devp,
+int gpio_lookup_name(const char *name, struct udevice **devp,
unsigned int *offsetp, unsigned int *gpiop);
+/**
+ * get_gpios() - Turn the values of a list of GPIOs into an integer
+ *
+ * This puts the value of the first GPIO into bit 0, the second into bit 1,
+ * etc. then returns the resulting integer.
+ *
+ * @gpio_list: List of GPIOs to collect
+ * @return resulting integer value
+ */
+unsigned gpio_get_values_as_int(const int *gpio_list);
+
#endif /* _ASM_GENERIC_GPIO_H_ */
projects / karo-tx-uboot.git / blobdiff