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![Simon Glass](/assets/img/avatar_default.png)
The gpio command mostly relies on gpio_request() and gpio_free() being nops, in that you can request a GPIO twice. With driver model this is now implemented correctly, so it fails. Change the command to deal with a failure to claim the GPIO. Signed-off-by: Simon Glass <sjg@chromium.org>
234 lines
5.1 KiB
C
234 lines
5.1 KiB
C
/*
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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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int __weak 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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static const char * const gpio_function[GPIOF_COUNT] = {
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"input",
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"output",
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"unused",
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"unknown",
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"func",
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};
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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 show_gpio(struct udevice *dev, const char *bank_name, int offset,
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int *flagsp)
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{
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struct dm_gpio_ops *ops = gpio_get_ops(dev);
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int func = GPIOF_UNKNOWN;
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char buf[80];
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int ret;
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BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function));
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if (ops->get_function) {
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ret = ops->get_function(dev, offset);
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if (ret >= 0 && ret < ARRAY_SIZE(gpio_function))
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func = ret;
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}
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if (!(*flagsp & FLAG_SHOW_ALL) && func == 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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*buf = '\0';
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if (ops->get_state) {
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ret = ops->get_state(dev, offset, buf, sizeof(buf));
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if (ret) {
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puts("<unknown>");
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return;
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}
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} else {
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sprintf(buf, "%s%u: %8s %d", bank_name, offset,
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gpio_function[func], ops->get_value(dev, offset));
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}
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puts(buf);
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puts("\n");
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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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continue;
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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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show_gpio(dev, bank_name, offset, &flags);
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} else {
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for (offset = 0; offset < num_bits; offset++) {
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show_gpio(dev, bank_name, offset,
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&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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ulong 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 (!strcmp(str_cmd, "status")) {
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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(sjg@chromium.org): 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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return cmd_process_error(cmdtp, ret);
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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: value = 1; break;
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case GPIO_CLEAR: value = 0; break;
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case GPIO_TOGGLE: value = !gpio_get_value(gpio); break;
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default: 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 %lu\n",
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str_gpio, gpio, value);
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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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