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