2 * Control GPIO pins on the fly
4 * Copyright (c) 2008-2011 Analog Devices Inc.
6 * Licensed under the GPL-2 or later.
15 int __weak name_to_gpio(const char *name)
17 return simple_strtoul(name, NULL, 10);
27 #if defined(CONFIG_DM_GPIO) && !defined(gpio_status)
28 static const char * const gpio_function[GPIOF_COUNT] = {
36 /* A few flags used by show_gpio() */
38 FLAG_SHOW_ALL = 1 << 0,
39 FLAG_SHOW_BANK = 1 << 1,
40 FLAG_SHOW_NEWLINE = 1 << 2,
43 static void show_gpio(struct udevice *dev, const char *bank_name, int offset,
46 struct dm_gpio_ops *ops = gpio_get_ops(dev);
47 int func = GPIOF_UNKNOWN;
51 BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function));
53 if (ops->get_function) {
54 ret = ops->get_function(dev, offset);
55 if (ret >= 0 && ret < ARRAY_SIZE(gpio_function))
58 if (!(*flagsp & FLAG_SHOW_ALL) && func == GPIOF_UNUSED)
60 if ((*flagsp & FLAG_SHOW_BANK) && bank_name) {
61 if (*flagsp & FLAG_SHOW_NEWLINE) {
63 *flagsp &= ~FLAG_SHOW_NEWLINE;
65 printf("Bank %s:\n", bank_name);
66 *flagsp &= ~FLAG_SHOW_BANK;
70 ret = ops->get_state(dev, offset, buf, sizeof(buf));
76 sprintf(buf, "%s%u: %8s %d", bank_name, offset,
77 gpio_function[func], ops->get_value(dev, offset));
84 static int do_gpio_status(bool all, const char *gpio_name)
92 if (gpio_name && !*gpio_name)
94 for (ret = uclass_first_device(UCLASS_GPIO, &dev);
96 ret = uclass_next_device(&dev)) {
97 const char *bank_name;
100 flags |= FLAG_SHOW_BANK;
102 flags |= FLAG_SHOW_ALL;
103 bank_name = gpio_get_bank_info(dev, &num_bits);
106 banklen = bank_name ? strlen(bank_name) : 0;
108 if (!gpio_name || !bank_name ||
109 !strncmp(gpio_name, bank_name, banklen)) {
110 const char *p = NULL;
113 p = gpio_name + banklen;
114 if (gpio_name && *p) {
115 offset = simple_strtoul(p, NULL, 10);
116 show_gpio(dev, bank_name, offset, &flags);
118 for (offset = 0; offset < num_bits; offset++) {
119 show_gpio(dev, bank_name, offset,
124 /* Add a newline between bank names */
125 if (!(flags & FLAG_SHOW_BANK))
126 flags |= FLAG_SHOW_NEWLINE;
133 static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
136 enum gpio_cmd sub_cmd;
138 const char *str_cmd, *str_gpio = NULL;
140 #ifdef CONFIG_DM_GPIO
146 return CMD_RET_USAGE;
150 #ifdef CONFIG_DM_GPIO
151 if (argc > 0 && !strcmp(*argv, "-a")) {
159 if (!strcmp(str_cmd, "status")) {
160 /* Support deprecated gpio_status() */
164 #elif defined(CONFIG_DM_GPIO)
165 return cmd_process_error(cmdtp, do_gpio_status(all, str_gpio));
174 /* parse the behavior */
176 case 'i': sub_cmd = GPIO_INPUT; break;
177 case 's': sub_cmd = GPIO_SET; break;
178 case 'c': sub_cmd = GPIO_CLEAR; break;
179 case 't': sub_cmd = GPIO_TOGGLE; break;
180 default: goto show_usage;
183 #if defined(CONFIG_DM_GPIO)
185 * TODO(sjg@chromium.org): For now we must fit into the existing GPIO
186 * framework, so we look up the name here and convert it to a GPIO number.
187 * Once all GPIO drivers are converted to driver model, we can change the
188 * code here to use the GPIO uclass interface instead of the numbered
189 * GPIO compatibility layer.
191 ret = gpio_lookup_name(str_gpio, NULL, NULL, &gpio);
193 return cmd_process_error(cmdtp, ret);
195 /* turn the gpio name into a gpio number */
196 gpio = name_to_gpio(str_gpio);
200 /* grab the pin before we tweak it */
201 ret = gpio_request(gpio, "cmd_gpio");
202 if (ret && ret != -EBUSY) {
203 printf("gpio: requesting pin %u failed\n", gpio);
207 /* finally, let's do it: set direction and exec command */
208 if (sub_cmd == GPIO_INPUT) {
209 gpio_direction_input(gpio);
210 value = gpio_get_value(gpio);
213 case GPIO_SET: value = 1; break;
214 case GPIO_CLEAR: value = 0; break;
215 case GPIO_TOGGLE: value = !gpio_get_value(gpio); break;
216 default: goto show_usage;
218 gpio_direction_output(gpio, value);
220 printf("gpio: pin %s (gpio %i) value is %lu\n",
221 str_gpio, gpio, value);
229 U_BOOT_CMD(gpio, 4, 0, do_gpio,
230 "query and control gpio pins",
231 "<input|set|clear|toggle> <pin>\n"
232 " - input/set/clear/toggle the specified pin\n"
233 "gpio status [-a] [<bank> | <pin>] - show [all/claimed] GPIOs");