| /* |
| * 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; |
| int 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", 2)) { |
| /* 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); |
| if (!IS_ERR_VALUE(value)) |
| value = !value; |
| break; |
| default: |
| goto show_usage; |
| } |
| gpio_direction_output(gpio, value); |
| } |
| #ifdef BL33_DEBUG_PRINT |
| printf("gpio: pin %s (gpio %i) value is ", str_gpio, gpio); |
| #endif |
| if (IS_ERR_VALUE(value)) |
| printf("unknown (ret=%d)\n", value); |
| #ifdef BL33_DEBUG_PRINT |
| else |
| printf("%d\n", value); |
| #endif |
| if (sub_cmd != GPIO_INPUT && !IS_ERR_VALUE(value)) { |
| int nval = gpio_get_value(gpio); |
| |
| if (IS_ERR_VALUE(nval)) |
| printf(" Warning: no access to GPIO output value\n"); |
| else if (nval != value) |
| printf(" Warning: value of pin is still %d\n", nval); |
| } |
| |
| 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"); |