1 /* 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> 11 #include <errno.h> 12 #include <dm.h> 13 #include <asm/gpio.h> 14 15 __weak int name_to_gpio(const char *name) 16 { 17 return simple_strtoul(name, NULL, 10); 18 } 19 20 enum gpio_cmd { 21 GPIO_INPUT, 22 GPIO_SET, 23 GPIO_CLEAR, 24 GPIO_TOGGLE, 25 }; 26 27 #if defined(CONFIG_DM_GPIO) && !defined(gpio_status) 28 29 /* A few flags used by show_gpio() */ 30 enum { 31 FLAG_SHOW_ALL = 1 << 0, 32 FLAG_SHOW_BANK = 1 << 1, 33 FLAG_SHOW_NEWLINE = 1 << 2, 34 }; 35 36 static void gpio_get_description(struct udevice *dev, const char *bank_name, 37 int offset, int *flagsp) 38 { 39 char buf[80]; 40 int ret; 41 42 ret = gpio_get_function(dev, offset, NULL); 43 if (ret < 0) 44 goto err; 45 if (!(*flagsp & FLAG_SHOW_ALL) && ret == GPIOF_UNUSED) 46 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 } 55 56 ret = gpio_get_status(dev, offset, buf, sizeof(buf)); 57 if (ret) 58 goto err; 59 60 printf("%s\n", buf); 61 return; 62 err: 63 printf("Error %d\n", ret); 64 } 65 66 static int do_gpio_status(bool all, const char *gpio_name) 67 { 68 struct udevice *dev; 69 int banklen; 70 int flags; 71 72 flags = 0; 73 if (gpio_name && !*gpio_name) 74 gpio_name = NULL; 75 for (uclass_first_device(UCLASS_GPIO, &dev); 76 dev; 77 uclass_next_device(&dev)) { 78 const char *bank_name; 79 int num_bits; 80 81 flags |= FLAG_SHOW_BANK; 82 if (all) 83 flags |= FLAG_SHOW_ALL; 84 bank_name = gpio_get_bank_info(dev, &num_bits); 85 if (!num_bits) { 86 debug("GPIO device %s has no bits\n", dev->name); 87 continue; 88 } 89 banklen = bank_name ? strlen(bank_name) : 0; 90 91 if (!gpio_name || !bank_name || 92 !strncmp(gpio_name, bank_name, banklen)) { 93 const char *p = NULL; 94 int offset; 95 96 p = gpio_name + banklen; 97 if (gpio_name && *p) { 98 offset = simple_strtoul(p, NULL, 10); 99 gpio_get_description(dev, bank_name, offset, 100 &flags); 101 } else { 102 for (offset = 0; offset < num_bits; offset++) { 103 gpio_get_description(dev, bank_name, 104 offset, &flags); 105 } 106 } 107 } 108 /* Add a newline between bank names */ 109 if (!(flags & FLAG_SHOW_BANK)) 110 flags |= FLAG_SHOW_NEWLINE; 111 } 112 113 return 0; 114 } 115 #endif 116 117 static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 118 { 119 unsigned int gpio; 120 enum gpio_cmd sub_cmd; 121 int value; 122 const char *str_cmd, *str_gpio = NULL; 123 int ret; 124 #ifdef CONFIG_DM_GPIO 125 bool all = false; 126 #endif 127 128 if (argc < 2) 129 show_usage: 130 return CMD_RET_USAGE; 131 str_cmd = argv[1]; 132 argc -= 2; 133 argv += 2; 134 #ifdef CONFIG_DM_GPIO 135 if (argc > 0 && !strcmp(*argv, "-a")) { 136 all = true; 137 argc--; 138 argv++; 139 } 140 #endif 141 if (argc > 0) 142 str_gpio = *argv; 143 if (!strncmp(str_cmd, "status", 2)) { 144 /* Support deprecated gpio_status() */ 145 #ifdef gpio_status 146 gpio_status(); 147 return 0; 148 #elif defined(CONFIG_DM_GPIO) 149 return cmd_process_error(cmdtp, do_gpio_status(all, str_gpio)); 150 #else 151 goto show_usage; 152 #endif 153 } 154 155 if (!str_gpio) 156 goto show_usage; 157 158 /* parse the behavior */ 159 switch (*str_cmd) { 160 case 'i': sub_cmd = GPIO_INPUT; break; 161 case 's': sub_cmd = GPIO_SET; break; 162 case 'c': sub_cmd = GPIO_CLEAR; break; 163 case 't': sub_cmd = GPIO_TOGGLE; break; 164 default: goto show_usage; 165 } 166 167 #if defined(CONFIG_DM_GPIO) 168 /* 169 * TODO(sjg@chromium.org): For now we must fit into the existing GPIO 170 * framework, so we look up the name here and convert it to a GPIO number. 171 * Once all GPIO drivers are converted to driver model, we can change the 172 * code here to use the GPIO uclass interface instead of the numbered 173 * GPIO compatibility layer. 174 */ 175 ret = gpio_lookup_name(str_gpio, NULL, NULL, &gpio); 176 if (ret) { 177 printf("GPIO: '%s' not found\n", str_gpio); 178 return cmd_process_error(cmdtp, ret); 179 } 180 #else 181 /* turn the gpio name into a gpio number */ 182 gpio = name_to_gpio(str_gpio); 183 if (gpio < 0) 184 goto show_usage; 185 #endif 186 /* grab the pin before we tweak it */ 187 ret = gpio_request(gpio, "cmd_gpio"); 188 if (ret && ret != -EBUSY) { 189 printf("gpio: requesting pin %u failed\n", gpio); 190 return -1; 191 } 192 193 /* finally, let's do it: set direction and exec command */ 194 if (sub_cmd == GPIO_INPUT) { 195 gpio_direction_input(gpio); 196 value = gpio_get_value(gpio); 197 } else { 198 switch (sub_cmd) { 199 case GPIO_SET: 200 value = 1; 201 break; 202 case GPIO_CLEAR: 203 value = 0; 204 break; 205 case GPIO_TOGGLE: 206 value = gpio_get_value(gpio); 207 if (!IS_ERR_VALUE(value)) 208 value = !value; 209 break; 210 default: 211 goto show_usage; 212 } 213 gpio_direction_output(gpio, value); 214 } 215 printf("gpio: pin %s (gpio %i) value is ", str_gpio, gpio); 216 if (IS_ERR_VALUE(value)) 217 printf("unknown (ret=%d)\n", value); 218 else 219 printf("%d\n", value); 220 if (sub_cmd != GPIO_INPUT && !IS_ERR_VALUE(value)) { 221 int nval = gpio_get_value(gpio); 222 223 if (IS_ERR_VALUE(nval)) 224 printf(" Warning: no access to GPIO output value\n"); 225 else if (nval != value) 226 printf(" Warning: value of pin is still %d\n", nval); 227 } 228 229 if (ret != -EBUSY) 230 gpio_free(gpio); 231 232 return value; 233 } 234 235 U_BOOT_CMD(gpio, 4, 0, do_gpio, 236 "query and control gpio pins", 237 "<input|set|clear|toggle> <pin>\n" 238 " - input/set/clear/toggle the specified pin\n" 239 "gpio status [-a] [<bank> | <pin>] - show [all/claimed] GPIOs"); 240