2 * Control GPIO pins on the fly
4 * Copyright (c) 2008-2011 Analog Devices Inc.
6 * Licensed under the GPL-2 or later.
15 __weak int name_to_gpio(const char *name)
17 return simple_strtoul(name, NULL, 10);
27 #if defined(CONFIG_DM_GPIO) && !defined(gpio_status)
29 /* A few flags used by show_gpio() */
31 FLAG_SHOW_ALL = 1 << 0,
32 FLAG_SHOW_BANK = 1 << 1,
33 FLAG_SHOW_NEWLINE = 1 << 2,
36 static void gpio_get_description(struct udevice *dev, const char *bank_name,
37 int offset, int *flagsp)
42 ret = gpio_get_function(dev, offset, NULL);
45 if (!(*flagsp & FLAG_SHOW_ALL) && ret == GPIOF_UNUSED)
47 if ((*flagsp & FLAG_SHOW_BANK) && bank_name) {
48 if (*flagsp & FLAG_SHOW_NEWLINE) {
50 *flagsp &= ~FLAG_SHOW_NEWLINE;
52 printf("Bank %s:\n", bank_name);
53 *flagsp &= ~FLAG_SHOW_BANK;
56 ret = gpio_get_status(dev, offset, buf, sizeof(buf));
63 printf("Error %d\n", ret);
66 static int do_gpio_status(bool all, const char *gpio_name)
74 if (gpio_name && !*gpio_name)
76 for (ret = uclass_first_device(UCLASS_GPIO, &dev);
78 ret = uclass_next_device(&dev)) {
79 const char *bank_name;
82 flags |= FLAG_SHOW_BANK;
84 flags |= FLAG_SHOW_ALL;
85 bank_name = gpio_get_bank_info(dev, &num_bits);
87 debug("GPIO device %s has no bits\n", dev->name);
90 banklen = bank_name ? strlen(bank_name) : 0;
92 if (!gpio_name || !bank_name ||
93 !strncmp(gpio_name, bank_name, banklen)) {
97 p = gpio_name + banklen;
98 if (gpio_name && *p) {
99 offset = simple_strtoul(p, NULL, 10);
100 gpio_get_description(dev, bank_name, offset,
103 for (offset = 0; offset < num_bits; offset++) {
104 gpio_get_description(dev, bank_name,
109 /* Add a newline between bank names */
110 if (!(flags & FLAG_SHOW_BANK))
111 flags |= FLAG_SHOW_NEWLINE;
118 static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
121 enum gpio_cmd sub_cmd;
123 const char *str_cmd, *str_gpio = NULL;
125 #ifdef CONFIG_DM_GPIO
131 return CMD_RET_USAGE;
135 #ifdef CONFIG_DM_GPIO
136 if (argc > 0 && !strcmp(*argv, "-a")) {
144 if (!strncmp(str_cmd, "status", 2)) {
145 /* Support deprecated gpio_status() */
149 #elif defined(CONFIG_DM_GPIO)
150 return cmd_process_error(cmdtp, do_gpio_status(all, str_gpio));
159 /* parse the behavior */
161 case 'i': sub_cmd = GPIO_INPUT; break;
162 case 's': sub_cmd = GPIO_SET; break;
163 case 'c': sub_cmd = GPIO_CLEAR; break;
164 case 't': sub_cmd = GPIO_TOGGLE; break;
165 default: goto show_usage;
168 #if defined(CONFIG_DM_GPIO)
170 * TODO(sjg@chromium.org): For now we must fit into the existing GPIO
171 * framework, so we look up the name here and convert it to a GPIO number.
172 * Once all GPIO drivers are converted to driver model, we can change the
173 * code here to use the GPIO uclass interface instead of the numbered
174 * GPIO compatibility layer.
176 ret = gpio_lookup_name(str_gpio, NULL, NULL, &gpio);
178 printf("GPIO: '%s' not found\n", str_gpio);
179 return cmd_process_error(cmdtp, ret);
182 /* turn the gpio name into a gpio number */
183 gpio = name_to_gpio(str_gpio);
187 /* grab the pin before we tweak it */
188 ret = gpio_request(gpio, "cmd_gpio");
189 if (ret && ret != -EBUSY) {
190 printf("gpio: requesting pin %u failed\n", gpio);
194 /* finally, let's do it: set direction and exec command */
195 if (sub_cmd == GPIO_INPUT) {
196 gpio_direction_input(gpio);
197 value = gpio_get_value(gpio);
200 case GPIO_SET: value = 1; break;
201 case GPIO_CLEAR: value = 0; break;
202 case GPIO_TOGGLE: value = !gpio_get_value(gpio); break;
203 default: goto show_usage;
205 gpio_direction_output(gpio, value);
207 printf("gpio: pin %s (gpio %i) value is %lu\n",
208 str_gpio, gpio, value);
216 U_BOOT_CMD(gpio, 4, 0, do_gpio,
217 "query and control gpio pins",
218 "<input|set|clear|toggle> <pin>\n"
219 " - input/set/clear/toggle the specified pin\n"
220 "gpio status [-a] [<bank> | <pin>] - show [all/claimed] GPIOs");