diff options
Diffstat (limited to 'cmd/gpio.c')
| -rw-r--r-- | cmd/gpio.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/cmd/gpio.c b/cmd/gpio.c new file mode 100644 index 0000000..2b78b16 --- /dev/null +++ b/cmd/gpio.c @@ -0,0 +1,220 @@ +/* + * Control GPIO pins on the fly + * + * Copyright (c) 2008-2011 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include <common.h> +#include <command.h> +#include <errno.h> +#include <dm.h> +#include <asm/gpio.h> + +__weak int name_to_gpio(const char *name) +{ + return simple_strtoul(name, NULL, 10); +} + +enum gpio_cmd { + GPIO_INPUT, + GPIO_SET, + GPIO_CLEAR, + GPIO_TOGGLE, +}; + +#if defined(CONFIG_DM_GPIO) && !defined(gpio_status) + +/* A few flags used by show_gpio() */ +enum { + FLAG_SHOW_ALL = 1 << 0, + FLAG_SHOW_BANK = 1 << 1, + FLAG_SHOW_NEWLINE = 1 << 2, +}; + +static void gpio_get_description(struct udevice *dev, const char *bank_name, + int offset, int *flagsp) +{ + char buf[80]; + int ret; + + ret = gpio_get_function(dev, offset, NULL); + if (ret < 0) + goto err; + if (!(*flagsp & FLAG_SHOW_ALL) && ret == GPIOF_UNUSED) + return; + if ((*flagsp & FLAG_SHOW_BANK) && bank_name) { + if (*flagsp & FLAG_SHOW_NEWLINE) { + putc('\n'); + *flagsp &= ~FLAG_SHOW_NEWLINE; + } + printf("Bank %s:\n", bank_name); + *flagsp &= ~FLAG_SHOW_BANK; + } + + ret = gpio_get_status(dev, offset, buf, sizeof(buf)); + if (ret) + goto err; + + printf("%s\n", buf); + return; +err: + printf("Error %d\n", ret); +} + +static int do_gpio_status(bool all, const char *gpio_name) +{ + struct udevice *dev; + int banklen; + int flags; + int ret; + + flags = 0; + if (gpio_name && !*gpio_name) + gpio_name = NULL; + for (ret = uclass_first_device(UCLASS_GPIO, &dev); + dev; + ret = uclass_next_device(&dev)) { + const char *bank_name; + int num_bits; + + flags |= FLAG_SHOW_BANK; + if (all) + flags |= FLAG_SHOW_ALL; + bank_name = gpio_get_bank_info(dev, &num_bits); + if (!num_bits) { + debug("GPIO device %s has no bits\n", dev->name); + continue; + } + banklen = bank_name ? strlen(bank_name) : 0; + + if (!gpio_name || !bank_name || + !strncmp(gpio_name, bank_name, banklen)) { + const char *p = NULL; + int offset; + + p = gpio_name + banklen; + if (gpio_name && *p) { + offset = simple_strtoul(p, NULL, 10); + gpio_get_description(dev, bank_name, offset, + &flags); + } else { + for (offset = 0; offset < num_bits; offset++) { + gpio_get_description(dev, bank_name, + offset, &flags); + } + } + } + /* Add a newline between bank names */ + if (!(flags & FLAG_SHOW_BANK)) + flags |= FLAG_SHOW_NEWLINE; + } + + return ret; +} +#endif + +static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + unsigned int gpio; + enum gpio_cmd sub_cmd; + ulong value; + const char *str_cmd, *str_gpio = NULL; + int ret; +#ifdef CONFIG_DM_GPIO + bool all = false; +#endif + + if (argc < 2) + show_usage: + return CMD_RET_USAGE; + str_cmd = argv[1]; + argc -= 2; + argv += 2; +#ifdef CONFIG_DM_GPIO + if (argc > 0 && !strcmp(*argv, "-a")) { + all = true; + argc--; + argv++; + } +#endif + if (argc > 0) + str_gpio = *argv; + if (!strncmp(str_cmd, "status", 1)) { + /* Support deprecated gpio_status() */ +#ifdef gpio_status + gpio_status(); + return 0; +#elif defined(CONFIG_DM_GPIO) + return cmd_process_error(cmdtp, do_gpio_status(all, str_gpio)); +#else + goto show_usage; +#endif + } + + if (!str_gpio) + goto show_usage; + + /* parse the behavior */ + switch (*str_cmd) { + case 'i': sub_cmd = GPIO_INPUT; break; + case 's': sub_cmd = GPIO_SET; break; + case 'c': sub_cmd = GPIO_CLEAR; break; + case 't': sub_cmd = GPIO_TOGGLE; break; + default: goto show_usage; + } + +#if defined(CONFIG_DM_GPIO) + /* + * TODO(sjg@chromium.org): For now we must fit into the existing GPIO + * framework, so we look up the name here and convert it to a GPIO number. + * Once all GPIO drivers are converted to driver model, we can change the + * code here to use the GPIO uclass interface instead of the numbered + * GPIO compatibility layer. + */ + ret = gpio_lookup_name(str_gpio, NULL, NULL, &gpio); + if (ret) { + printf("GPIO: '%s' not found\n", str_gpio); + return cmd_process_error(cmdtp, ret); + } +#else + /* turn the gpio name into a gpio number */ + gpio = name_to_gpio(str_gpio); + if (gpio < 0) + goto show_usage; +#endif + /* grab the pin before we tweak it */ + ret = gpio_request(gpio, "cmd_gpio"); + if (ret && ret != -EBUSY) { + printf("gpio: requesting pin %u failed\n", gpio); + return -1; + } + + /* finally, let's do it: set direction and exec command */ + if (sub_cmd == GPIO_INPUT) { + gpio_direction_input(gpio); + value = gpio_get_value(gpio); + } else { + switch (sub_cmd) { + case GPIO_SET: value = 1; break; + case GPIO_CLEAR: value = 0; break; + case GPIO_TOGGLE: value = !gpio_get_value(gpio); break; + default: goto show_usage; + } + gpio_direction_output(gpio, value); + } + printf("gpio: pin %s (gpio %i) value is %lu\n", + str_gpio, gpio, value); + + if (ret != -EBUSY) + gpio_free(gpio); + + return value; +} + +U_BOOT_CMD(gpio, 4, 0, do_gpio, + "query and control gpio pins", + "<input|set|clear|toggle> <pin>\n" + " - input/set/clear/toggle the specified pin\n" + "gpio status [-a] [<bank> | <pin>] - show [all/claimed] GPIOs"); |