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Mike Frysingera972b8d2011-04-03 04:40:46 -04001/*
2 * Control GPIO pins on the fly
3 *
4 * Copyright (c) 2008-2011 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
9#include <common.h>
10#include <command.h>
Simon Glass9165e842014-08-11 09:23:53 -060011#include <errno.h>
Simon Glass95a260a92014-02-26 15:59:26 -070012#include <dm.h>
Mike Frysingera972b8d2011-04-03 04:40:46 -040013#include <asm/gpio.h>
14
Jeroen Hofstee5b5ac642014-10-08 22:58:03 +020015__weak int name_to_gpio(const char *name)
Ian Campbellfd11bea2014-03-27 20:34:13 +000016{
17 return simple_strtoul(name, NULL, 10);
18}
Mike Frysingera972b8d2011-04-03 04:40:46 -040019
20enum gpio_cmd {
Simon Glass66f657d2019-01-21 14:53:20 -070021 GPIOC_INPUT,
22 GPIOC_SET,
23 GPIOC_CLEAR,
24 GPIOC_TOGGLE,
Mike Frysingera972b8d2011-04-03 04:40:46 -040025};
26
Simon Glass95a260a92014-02-26 15:59:26 -070027#if defined(CONFIG_DM_GPIO) && !defined(gpio_status)
Mike Frysingera972b8d2011-04-03 04:40:46 -040028
Simon Glass89e64052014-08-11 09:23:52 -060029/* A few flags used by show_gpio() */
30enum {
31 FLAG_SHOW_ALL = 1 << 0,
32 FLAG_SHOW_BANK = 1 << 1,
33 FLAG_SHOW_NEWLINE = 1 << 2,
34};
35
Simon Glass07575352014-10-04 11:29:44 -060036static void gpio_get_description(struct udevice *dev, const char *bank_name,
37 int offset, int *flagsp)
Simon Glass95a260a92014-02-26 15:59:26 -070038{
Simon Glass95a260a92014-02-26 15:59:26 -070039 char buf[80];
40 int ret;
41
Simon Glass07575352014-10-04 11:29:44 -060042 ret = gpio_get_function(dev, offset, NULL);
43 if (ret < 0)
44 goto err;
45 if (!(*flagsp & FLAG_SHOW_ALL) && ret == GPIOF_UNUSED)
Simon Glass89e64052014-08-11 09:23:52 -060046 return;
47 if ((*flagsp & FLAG_SHOW_BANK) && bank_name) {
48 if (*flagsp & FLAG_SHOW_NEWLINE) {
49 putc('\n');
50 *flagsp &= ~FLAG_SHOW_NEWLINE;
51 }
52 printf("Bank %s:\n", bank_name);
53 *flagsp &= ~FLAG_SHOW_BANK;
54 }
Simon Glass95a260a92014-02-26 15:59:26 -070055
Simon Glass07575352014-10-04 11:29:44 -060056 ret = gpio_get_status(dev, offset, buf, sizeof(buf));
57 if (ret)
58 goto err;
59
60 printf("%s\n", buf);
61 return;
62err:
63 printf("Error %d\n", ret);
Simon Glass95a260a92014-02-26 15:59:26 -070064}
65
Simon Glass89e64052014-08-11 09:23:52 -060066static int do_gpio_status(bool all, const char *gpio_name)
Simon Glass95a260a92014-02-26 15:59:26 -070067{
Heiko Schocher54c5d082014-05-22 12:43:05 +020068 struct udevice *dev;
Simon Glass89e64052014-08-11 09:23:52 -060069 int banklen;
70 int flags;
Simon Glass95a260a92014-02-26 15:59:26 -070071 int ret;
72
Simon Glass89e64052014-08-11 09:23:52 -060073 flags = 0;
Simon Glass95a260a92014-02-26 15:59:26 -070074 if (gpio_name && !*gpio_name)
75 gpio_name = NULL;
76 for (ret = uclass_first_device(UCLASS_GPIO, &dev);
77 dev;
78 ret = uclass_next_device(&dev)) {
79 const char *bank_name;
80 int num_bits;
81
Simon Glass89e64052014-08-11 09:23:52 -060082 flags |= FLAG_SHOW_BANK;
83 if (all)
84 flags |= FLAG_SHOW_ALL;
Simon Glass95a260a92014-02-26 15:59:26 -070085 bank_name = gpio_get_bank_info(dev, &num_bits);
Simon Glass07575352014-10-04 11:29:44 -060086 if (!num_bits) {
87 debug("GPIO device %s has no bits\n", dev->name);
Simon Glass89e64052014-08-11 09:23:52 -060088 continue;
Simon Glass07575352014-10-04 11:29:44 -060089 }
Simon Glass89e64052014-08-11 09:23:52 -060090 banklen = bank_name ? strlen(bank_name) : 0;
Simon Glass95a260a92014-02-26 15:59:26 -070091
92 if (!gpio_name || !bank_name ||
Simon Glass89e64052014-08-11 09:23:52 -060093 !strncmp(gpio_name, bank_name, banklen)) {
Simon Glass95a260a92014-02-26 15:59:26 -070094 const char *p = NULL;
95 int offset;
96
Simon Glass89e64052014-08-11 09:23:52 -060097 p = gpio_name + banklen;
98 if (gpio_name && *p) {
Simon Glass95a260a92014-02-26 15:59:26 -070099 offset = simple_strtoul(p, NULL, 10);
Simon Glass07575352014-10-04 11:29:44 -0600100 gpio_get_description(dev, bank_name, offset,
101 &flags);
Simon Glass95a260a92014-02-26 15:59:26 -0700102 } else {
Simon Glass89e64052014-08-11 09:23:52 -0600103 for (offset = 0; offset < num_bits; offset++) {
Simon Glass07575352014-10-04 11:29:44 -0600104 gpio_get_description(dev, bank_name,
105 offset, &flags);
Simon Glass89e64052014-08-11 09:23:52 -0600106 }
Simon Glass95a260a92014-02-26 15:59:26 -0700107 }
108 }
Simon Glass89e64052014-08-11 09:23:52 -0600109 /* Add a newline between bank names */
110 if (!(flags & FLAG_SHOW_BANK))
111 flags |= FLAG_SHOW_NEWLINE;
Simon Glass95a260a92014-02-26 15:59:26 -0700112 }
113
114 return ret;
115}
Mike Frysingera972b8d2011-04-03 04:40:46 -0400116#endif
117
Simon Glass95a260a92014-02-26 15:59:26 -0700118static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
119{
120 unsigned int gpio;
121 enum gpio_cmd sub_cmd;
Simon Glassb71bea72015-08-31 18:55:36 -0600122 int value;
Simon Glass95a260a92014-02-26 15:59:26 -0700123 const char *str_cmd, *str_gpio = NULL;
Simon Glass9165e842014-08-11 09:23:53 -0600124 int ret;
Simon Glass95a260a92014-02-26 15:59:26 -0700125#ifdef CONFIG_DM_GPIO
Simon Glass89e64052014-08-11 09:23:52 -0600126 bool all = false;
Simon Glass95a260a92014-02-26 15:59:26 -0700127#endif
128
129 if (argc < 2)
Mike Frysingera972b8d2011-04-03 04:40:46 -0400130 show_usage:
Simon Glass4c12eeb2011-12-10 08:44:01 +0000131 return CMD_RET_USAGE;
Mike Frysingera972b8d2011-04-03 04:40:46 -0400132 str_cmd = argv[1];
Simon Glass89e64052014-08-11 09:23:52 -0600133 argc -= 2;
134 argv += 2;
135#ifdef CONFIG_DM_GPIO
136 if (argc > 0 && !strcmp(*argv, "-a")) {
137 all = true;
138 argc--;
139 argv++;
140 }
141#endif
142 if (argc > 0)
143 str_gpio = *argv;
Simon Glass4c80c532016-02-14 16:28:59 -0700144 if (!strncmp(str_cmd, "status", 2)) {
Simon Glass95a260a92014-02-26 15:59:26 -0700145 /* Support deprecated gpio_status() */
146#ifdef gpio_status
147 gpio_status();
148 return 0;
149#elif defined(CONFIG_DM_GPIO)
Simon Glass89e64052014-08-11 09:23:52 -0600150 return cmd_process_error(cmdtp, do_gpio_status(all, str_gpio));
Simon Glass95a260a92014-02-26 15:59:26 -0700151#else
152 goto show_usage;
153#endif
154 }
155
156 if (!str_gpio)
157 goto show_usage;
Mike Frysingera972b8d2011-04-03 04:40:46 -0400158
159 /* parse the behavior */
160 switch (*str_cmd) {
Simon Glass66f657d2019-01-21 14:53:20 -0700161 case 'i':
162 sub_cmd = GPIOC_INPUT;
163 break;
164 case 's':
165 sub_cmd = GPIOC_SET;
166 break;
167 case 'c':
168 sub_cmd = GPIOC_CLEAR;
169 break;
170 case 't':
171 sub_cmd = GPIOC_TOGGLE;
172 break;
173 default:
174 goto show_usage;
Mike Frysingera972b8d2011-04-03 04:40:46 -0400175 }
176
Simon Glass95a260a92014-02-26 15:59:26 -0700177#if defined(CONFIG_DM_GPIO)
178 /*
179 * TODO(sjg@chromium.org): For now we must fit into the existing GPIO
180 * framework, so we look up the name here and convert it to a GPIO number.
181 * Once all GPIO drivers are converted to driver model, we can change the
182 * code here to use the GPIO uclass interface instead of the numbered
183 * GPIO compatibility layer.
184 */
185 ret = gpio_lookup_name(str_gpio, NULL, NULL, &gpio);
Simon Glass66280e82016-01-21 19:44:50 -0700186 if (ret) {
187 printf("GPIO: '%s' not found\n", str_gpio);
Simon Glass95a260a92014-02-26 15:59:26 -0700188 return cmd_process_error(cmdtp, ret);
Simon Glass66280e82016-01-21 19:44:50 -0700189 }
Simon Glass95a260a92014-02-26 15:59:26 -0700190#else
Mike Frysingera972b8d2011-04-03 04:40:46 -0400191 /* turn the gpio name into a gpio number */
192 gpio = name_to_gpio(str_gpio);
193 if (gpio < 0)
194 goto show_usage;
Simon Glass95a260a92014-02-26 15:59:26 -0700195#endif
Mike Frysingera972b8d2011-04-03 04:40:46 -0400196 /* grab the pin before we tweak it */
Simon Glass9165e842014-08-11 09:23:53 -0600197 ret = gpio_request(gpio, "cmd_gpio");
198 if (ret && ret != -EBUSY) {
Mike Frysinger68012012011-04-12 03:02:11 -0400199 printf("gpio: requesting pin %u failed\n", gpio);
200 return -1;
201 }
Mike Frysingera972b8d2011-04-03 04:40:46 -0400202
203 /* finally, let's do it: set direction and exec command */
Simon Glass66f657d2019-01-21 14:53:20 -0700204 if (sub_cmd == GPIOC_INPUT) {
Mike Frysingera972b8d2011-04-03 04:40:46 -0400205 gpio_direction_input(gpio);
206 value = gpio_get_value(gpio);
207 } else {
208 switch (sub_cmd) {
Simon Glass66f657d2019-01-21 14:53:20 -0700209 case GPIOC_SET:
Simon Glassb71bea72015-08-31 18:55:36 -0600210 value = 1;
211 break;
Simon Glass66f657d2019-01-21 14:53:20 -0700212 case GPIOC_CLEAR:
Simon Glassb71bea72015-08-31 18:55:36 -0600213 value = 0;
214 break;
Simon Glass66f657d2019-01-21 14:53:20 -0700215 case GPIOC_TOGGLE:
Simon Glassb71bea72015-08-31 18:55:36 -0600216 value = gpio_get_value(gpio);
217 if (!IS_ERR_VALUE(value))
218 value = !value;
219 break;
220 default:
221 goto show_usage;
Mike Frysingera972b8d2011-04-03 04:40:46 -0400222 }
223 gpio_direction_output(gpio, value);
224 }
Heinrich Schuchardtb1970012019-01-06 11:31:54 +0100225 printf("gpio: pin %s (gpio %u) value is ", str_gpio, gpio);
Simon Glassb71bea72015-08-31 18:55:36 -0600226 if (IS_ERR_VALUE(value))
227 printf("unknown (ret=%d)\n", value);
228 else
229 printf("%d\n", value);
Simon Glass66f657d2019-01-21 14:53:20 -0700230 if (sub_cmd != GPIOC_INPUT && !IS_ERR_VALUE(value)) {
Simon Glassb71bea72015-08-31 18:55:36 -0600231 int nval = gpio_get_value(gpio);
232
233 if (IS_ERR_VALUE(nval))
234 printf(" Warning: no access to GPIO output value\n");
235 else if (nval != value)
236 printf(" Warning: value of pin is still %d\n", nval);
237 }
Mike Frysingera972b8d2011-04-03 04:40:46 -0400238
Simon Glass9165e842014-08-11 09:23:53 -0600239 if (ret != -EBUSY)
240 gpio_free(gpio);
Mike Frysingera972b8d2011-04-03 04:40:46 -0400241
242 return value;
243}
244
Simon Glass89e64052014-08-11 09:23:52 -0600245U_BOOT_CMD(gpio, 4, 0, do_gpio,
246 "query and control gpio pins",
247 "<input|set|clear|toggle> <pin>\n"
248 " - input/set/clear/toggle the specified pin\n"
249 "gpio status [-a] [<bank> | <pin>] - show [all/claimed] GPIOs");