From b892d127ffd448e8adf21e9703c0c5107e2a7814 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Sat, 4 Oct 2014 11:29:42 -0600 Subject: dm: gpio: Implement GPIO reservation in the uclass We have several GPIO drivers now and all are doing similar things to record which GPIOs are reserved. Move this logic into the uclass to make the drivers similar. We retain the request()/free() methods since currently one driver does use these for setting up the pin. Signed-off-by: Simon Glass --- include/asm-generic/gpio.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'include/asm-generic') diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index 1ebb9c724d..128249ef89 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -29,6 +29,9 @@ * 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 * @return 0 if ok, -1 on error @@ -157,11 +160,14 @@ struct dm_gpio_ops { * @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 */ -- cgit v1.2.1 From 6449a506d67b0374bf23a3833f15afa0c92a7a0e Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Sat, 4 Oct 2014 11:29:43 -0600 Subject: dm: gpio: Add gpio_get_function() and friends Add helpers to the uclass to allow finding out the pin function. Signed-off-by: Simon Glass --- include/asm-generic/gpio.h | 34 +++++++++++++++++++++++++++++++++- 1 file changed, 33 insertions(+), 1 deletion(-) (limited to 'include/asm-generic') diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index 128249ef89..71044549ba 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -83,7 +83,7 @@ int gpio_get_value(unsigned gpio); int gpio_set_value(unsigned gpio, int value); /* State of a GPIO, as reported by get_function() */ -enum { +enum gpio_func_t { GPIOF_INPUT = 0, GPIOF_OUTPUT, GPIOF_UNUSED, /* Not claimed */ @@ -95,6 +95,38 @@ enum { struct udevice; +/** + * 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); + /** * struct struct dm_gpio_ops - Driver model GPIO operations * -- cgit v1.2.1 From 0757535a7eee3ae5603520fe4a0588a01a590ea7 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Sat, 4 Oct 2014 11:29:44 -0600 Subject: dm: Move the function for getting GPIO status into the uclass This function can be more easily tested if it is in the uclass. Signed-off-by: Simon Glass --- include/asm-generic/gpio.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'include/asm-generic') diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index 71044549ba..693bb56f77 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -95,6 +95,24 @@ enum gpio_func_t { 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 * -- cgit v1.2.1 From d44f597b12b8f8099c3c52c3eb09540966cafe79 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Sat, 4 Oct 2014 11:29:49 -0600 Subject: dm: gpio: Add gpio_requestf() helper for printf() strings Add a helper which permits a printf()-style format string for the requester string. Signed-off-by: Simon Glass --- include/asm-generic/gpio.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'include/asm-generic') diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index 693bb56f77..8af760e777 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -145,6 +145,16 @@ int gpio_get_function(struct udevice *dev, int offset, const char **namep); */ 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 * -- cgit v1.2.1 From 85bfe6e4f6ecb667a8f65698e92bfa9a1a481850 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Sat, 4 Oct 2014 11:29:57 -0600 Subject: dm: gpio: Remove unused get_state() uclass method This is no longer used so drop it. Signed-off-by: Simon Glass --- include/asm-generic/gpio.h | 2 -- 1 file changed, 2 deletions(-) (limited to 'include/asm-generic') diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index 8af760e777..4ec411b372 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -198,8 +198,6 @@ struct dm_gpio_ops { * @return current function - GPIOF_... */ int (*get_function)(struct udevice *dev, unsigned offset); - int (*get_state)(struct udevice *dev, unsigned offset, char *state, - int maxlen); }; /** -- cgit v1.2.1