diff options
Diffstat (limited to 'drivers/gpio/gpio-uclass.c')
| -rw-r--r-- | drivers/gpio/gpio-uclass.c | 236 |
1 files changed, 210 insertions, 26 deletions
diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c index f1bbc58796..45e9a5ad22 100644 --- a/drivers/gpio/gpio-uclass.c +++ b/drivers/gpio/gpio-uclass.c @@ -7,7 +7,9 @@ #include <common.h> #include <dm.h> #include <errno.h> +#include <malloc.h> #include <asm/gpio.h> +#include <linux/ctype.h> /** * gpio_to_device() - Convert global GPIO number to device, number @@ -43,35 +45,47 @@ static int gpio_to_device(unsigned int gpio, struct udevice **devp, int gpio_lookup_name(const char *name, struct udevice **devp, unsigned int *offsetp, unsigned int *gpiop) { - struct gpio_dev_priv *uc_priv; + struct gpio_dev_priv *uc_priv = NULL; struct udevice *dev; + ulong offset; + int numeric; int ret; if (devp) *devp = NULL; + numeric = isdigit(*name) ? simple_strtoul(name, NULL, 10) : -1; for (ret = uclass_first_device(UCLASS_GPIO, &dev); dev; ret = uclass_next_device(&dev)) { - ulong offset; int len; uc_priv = dev->uclass_priv; + if (numeric != -1) { + offset = numeric - uc_priv->gpio_base; + /* Allow GPIOs to be numbered from 0 */ + if (offset >= 0 && offset < uc_priv->gpio_count) + break; + } + len = uc_priv->bank_name ? strlen(uc_priv->bank_name) : 0; if (!strncasecmp(name, uc_priv->bank_name, len)) { - if (strict_strtoul(name + len, 10, &offset)) - continue; - if (devp) - *devp = dev; - if (offsetp) - *offsetp = offset; - if (gpiop) - *gpiop = uc_priv->gpio_base + offset; - return 0; + if (!strict_strtoul(name + len, 10, &offset)) + break; } } - return ret ? ret : -EINVAL; + if (!dev) + return ret ? ret : -EINVAL; + + if (devp) + *devp = dev; + if (offsetp) + *offsetp = offset; + if (gpiop) + *gpiop = uc_priv->gpio_base + offset; + + return 0; } /** @@ -79,24 +93,62 @@ int gpio_lookup_name(const char *name, struct udevice **devp, * gpio: GPIO number * label: Name for the requested GPIO * + * The label is copied and allocated so the caller does not need to keep + * the pointer around. + * * This function implements the API that's compatible with current * GPIO API used in U-Boot. The request is forwarded to particular * GPIO driver. Returns 0 on success, negative value on error. */ int gpio_request(unsigned gpio, const char *label) { + struct gpio_dev_priv *uc_priv; unsigned int offset; struct udevice *dev; + char *str; int ret; ret = gpio_to_device(gpio, &dev, &offset); if (ret) return ret; - if (!gpio_get_ops(dev)->request) - return 0; + uc_priv = dev->uclass_priv; + if (uc_priv->name[offset]) + return -EBUSY; + str = strdup(label); + if (!str) + return -ENOMEM; + if (gpio_get_ops(dev)->request) { + ret = gpio_get_ops(dev)->request(dev, offset, label); + if (ret) { + free(str); + return ret; + } + } + uc_priv->name[offset] = str; + + return 0; +} + +/** + * gpio_requestf() - [COMPAT] Request GPIO + * @gpio: GPIO number + * @fmt: Format string for the requested GPIO + * @...: Arguments for the printf() format string + * + * This function implements the API that's compatible with current + * GPIO API used in U-Boot. The request is forwarded to particular + * GPIO driver. Returns 0 on success, negative value on error. + */ +int gpio_requestf(unsigned gpio, const char *fmt, ...) +{ + va_list args; + char buf[40]; - return gpio_get_ops(dev)->request(dev, offset, label); + va_start(args, fmt); + vscnprintf(buf, sizeof(buf), fmt, args); + va_end(args); + return gpio_request(gpio, buf); } /** @@ -109,6 +161,7 @@ int gpio_request(unsigned gpio, const char *label) */ int gpio_free(unsigned gpio) { + struct gpio_dev_priv *uc_priv; unsigned int offset; struct udevice *dev; int ret; @@ -117,9 +170,34 @@ int gpio_free(unsigned gpio) if (ret) return ret; - if (!gpio_get_ops(dev)->free) - return 0; - return gpio_get_ops(dev)->free(dev, offset); + uc_priv = dev->uclass_priv; + if (!uc_priv->name[offset]) + return -ENXIO; + if (gpio_get_ops(dev)->free) { + ret = gpio_get_ops(dev)->free(dev, offset); + if (ret) + return ret; + } + + free(uc_priv->name[offset]); + uc_priv->name[offset] = NULL; + + return 0; +} + +static int check_reserved(struct udevice *dev, unsigned offset, + const char *func) +{ + struct gpio_dev_priv *uc_priv = dev->uclass_priv; + + if (!uc_priv->name[offset]) { + printf("%s: %s: error: gpio %s%d not reserved\n", + dev->name, func, + uc_priv->bank_name ? uc_priv->bank_name : "", offset); + return -EBUSY; + } + + return 0; } /** @@ -139,8 +217,9 @@ int gpio_direction_input(unsigned gpio) ret = gpio_to_device(gpio, &dev, &offset); if (ret) return ret; + ret = check_reserved(dev, offset, "dir_input"); - return gpio_get_ops(dev)->direction_input(dev, offset); + return ret ? ret : gpio_get_ops(dev)->direction_input(dev, offset); } /** @@ -161,8 +240,10 @@ int gpio_direction_output(unsigned gpio, int value) ret = gpio_to_device(gpio, &dev, &offset); if (ret) return ret; + ret = check_reserved(dev, offset, "dir_output"); - return gpio_get_ops(dev)->direction_output(dev, offset, value); + return ret ? ret : + gpio_get_ops(dev)->direction_output(dev, offset, value); } /** @@ -183,8 +264,9 @@ int gpio_get_value(unsigned gpio) ret = gpio_to_device(gpio, &dev, &offset); if (ret) return ret; + ret = check_reserved(dev, offset, "get_value"); - return gpio_get_ops(dev)->get_value(dev, offset); + return ret ? ret : gpio_get_ops(dev)->get_value(dev, offset); } /** @@ -205,8 +287,9 @@ int gpio_set_value(unsigned gpio, int value) ret = gpio_to_device(gpio, &dev, &offset); if (ret) return ret; + ret = check_reserved(dev, offset, "set_value"); - return gpio_get_ops(dev)->set_value(dev, offset, value); + return ret ? ret : gpio_get_ops(dev)->set_value(dev, offset, value); } const char *gpio_get_bank_info(struct udevice *dev, int *bit_count) @@ -221,8 +304,94 @@ const char *gpio_get_bank_info(struct udevice *dev, int *bit_count) return priv->bank_name; } +static const char * const gpio_function[GPIOF_COUNT] = { + "input", + "output", + "unused", + "unknown", + "func", +}; + +int get_function(struct udevice *dev, int offset, bool skip_unused, + const char **namep) +{ + struct gpio_dev_priv *uc_priv = dev->uclass_priv; + struct dm_gpio_ops *ops = gpio_get_ops(dev); + + BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function)); + if (!device_active(dev)) + return -ENODEV; + if (offset < 0 || offset >= uc_priv->gpio_count) + return -EINVAL; + if (namep) + *namep = uc_priv->name[offset]; + if (skip_unused && !uc_priv->name[offset]) + return GPIOF_UNUSED; + if (ops->get_function) { + int ret; + + ret = ops->get_function(dev, offset); + if (ret < 0) + return ret; + if (ret >= ARRAY_SIZE(gpio_function)) + return -ENODATA; + return ret; + } + + return GPIOF_UNKNOWN; +} + +int gpio_get_function(struct udevice *dev, int offset, const char **namep) +{ + return get_function(dev, offset, true, namep); +} + +int gpio_get_raw_function(struct udevice *dev, int offset, const char **namep) +{ + return get_function(dev, offset, false, namep); +} + +int gpio_get_status(struct udevice *dev, int offset, char *buf, int buffsize) +{ + struct dm_gpio_ops *ops = gpio_get_ops(dev); + struct gpio_dev_priv *priv; + char *str = buf; + int func; + int ret; + int len; + + BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function)); + + *buf = 0; + priv = dev->uclass_priv; + ret = gpio_get_raw_function(dev, offset, NULL); + if (ret < 0) + return ret; + func = ret; + len = snprintf(str, buffsize, "%s%d: %s", + priv->bank_name ? priv->bank_name : "", + offset, gpio_function[func]); + if (func == GPIOF_INPUT || func == GPIOF_OUTPUT || + func == GPIOF_UNUSED) { + const char *label; + bool used; + + ret = ops->get_value(dev, offset); + if (ret < 0) + return ret; + used = gpio_get_function(dev, offset, &label) != GPIOF_UNUSED; + snprintf(str + len, buffsize - len, ": %d [%c]%s%s", + ret, + used ? 'x' : ' ', + used ? " " : "", + label ? label : ""); + } + + return 0; +} + /* We need to renumber the GPIOs when any driver is probed/removed */ -static int gpio_renumber(void) +static int gpio_renumber(struct udevice *removed_dev) { struct gpio_dev_priv *uc_priv; struct udevice *dev; @@ -237,7 +406,7 @@ static int gpio_renumber(void) /* Ensure that we have a base for each bank */ base = 0; uclass_foreach_dev(dev, uc) { - if (device_active(dev)) { + if (device_active(dev) && dev != removed_dev) { uc_priv = dev->uclass_priv; uc_priv->gpio_base = base; base += uc_priv->gpio_count; @@ -249,12 +418,27 @@ static int gpio_renumber(void) static int gpio_post_probe(struct udevice *dev) { - return gpio_renumber(); + struct gpio_dev_priv *uc_priv = dev->uclass_priv; + + uc_priv->name = calloc(uc_priv->gpio_count, sizeof(char *)); + if (!uc_priv->name) + return -ENOMEM; + + return gpio_renumber(NULL); } static int gpio_pre_remove(struct udevice *dev) { - return gpio_renumber(); + struct gpio_dev_priv *uc_priv = dev->uclass_priv; + int i; + + for (i = 0; i < uc_priv->gpio_count; i++) { + if (uc_priv->name[i]) + free(uc_priv->name[i]); + } + free(uc_priv->name); + + return gpio_renumber(dev); } UCLASS_DRIVER(gpio) = { |
