Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2013 Google, Inc |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0+ |
| 5 | */ |
| 6 | |
| 7 | #include <common.h> |
| 8 | #include <dm.h> |
| 9 | #include <errno.h> |
Simon Glass | 0dac4d5 | 2015-01-05 20:05:28 -0700 | [diff] [blame^] | 10 | #include <fdtdec.h> |
Simon Glass | b892d12 | 2014-10-04 11:29:42 -0600 | [diff] [blame] | 11 | #include <malloc.h> |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 12 | #include <asm/gpio.h> |
Simon Glass | fe1ef50 | 2014-10-22 21:37:01 -0600 | [diff] [blame] | 13 | #include <linux/ctype.h> |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 14 | |
| 15 | /** |
| 16 | * gpio_to_device() - Convert global GPIO number to device, number |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 17 | * |
| 18 | * Convert the GPIO number to an entry in the list of GPIOs |
| 19 | * or GPIO blocks registered with the GPIO controller. Returns |
| 20 | * entry on success, NULL on error. |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 21 | * |
| 22 | * @gpio: The numeric representation of the GPIO |
| 23 | * @desc: Returns description (desc->flags will always be 0) |
| 24 | * @return 0 if found, -ENOENT if not found |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 25 | */ |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 26 | static int gpio_to_device(unsigned int gpio, struct gpio_desc *desc) |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 27 | { |
| 28 | struct gpio_dev_priv *uc_priv; |
Heiko Schocher | 54c5d08 | 2014-05-22 12:43:05 +0200 | [diff] [blame] | 29 | struct udevice *dev; |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 30 | int ret; |
| 31 | |
| 32 | for (ret = uclass_first_device(UCLASS_GPIO, &dev); |
| 33 | dev; |
| 34 | ret = uclass_next_device(&dev)) { |
| 35 | uc_priv = dev->uclass_priv; |
| 36 | if (gpio >= uc_priv->gpio_base && |
| 37 | gpio < uc_priv->gpio_base + uc_priv->gpio_count) { |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 38 | desc->dev = dev; |
| 39 | desc->offset = gpio - uc_priv->gpio_base; |
| 40 | desc->flags = 0; |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 41 | return 0; |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | /* No such GPIO */ |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 46 | return ret ? ret : -ENOENT; |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 47 | } |
| 48 | |
Heiko Schocher | 54c5d08 | 2014-05-22 12:43:05 +0200 | [diff] [blame] | 49 | int gpio_lookup_name(const char *name, struct udevice **devp, |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 50 | unsigned int *offsetp, unsigned int *gpiop) |
| 51 | { |
Simon Glass | fe1ef50 | 2014-10-22 21:37:01 -0600 | [diff] [blame] | 52 | struct gpio_dev_priv *uc_priv = NULL; |
Heiko Schocher | 54c5d08 | 2014-05-22 12:43:05 +0200 | [diff] [blame] | 53 | struct udevice *dev; |
Simon Glass | fe1ef50 | 2014-10-22 21:37:01 -0600 | [diff] [blame] | 54 | ulong offset; |
| 55 | int numeric; |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 56 | int ret; |
| 57 | |
| 58 | if (devp) |
| 59 | *devp = NULL; |
Simon Glass | fe1ef50 | 2014-10-22 21:37:01 -0600 | [diff] [blame] | 60 | numeric = isdigit(*name) ? simple_strtoul(name, NULL, 10) : -1; |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 61 | for (ret = uclass_first_device(UCLASS_GPIO, &dev); |
| 62 | dev; |
| 63 | ret = uclass_next_device(&dev)) { |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 64 | int len; |
| 65 | |
| 66 | uc_priv = dev->uclass_priv; |
Simon Glass | fe1ef50 | 2014-10-22 21:37:01 -0600 | [diff] [blame] | 67 | if (numeric != -1) { |
| 68 | offset = numeric - uc_priv->gpio_base; |
| 69 | /* Allow GPIOs to be numbered from 0 */ |
| 70 | if (offset >= 0 && offset < uc_priv->gpio_count) |
| 71 | break; |
| 72 | } |
| 73 | |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 74 | len = uc_priv->bank_name ? strlen(uc_priv->bank_name) : 0; |
| 75 | |
Simon Glass | 939cda5 | 2014-06-11 23:29:47 -0600 | [diff] [blame] | 76 | if (!strncasecmp(name, uc_priv->bank_name, len)) { |
Simon Glass | fe1ef50 | 2014-10-22 21:37:01 -0600 | [diff] [blame] | 77 | if (!strict_strtoul(name + len, 10, &offset)) |
| 78 | break; |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 79 | } |
| 80 | } |
| 81 | |
Simon Glass | fe1ef50 | 2014-10-22 21:37:01 -0600 | [diff] [blame] | 82 | if (!dev) |
| 83 | return ret ? ret : -EINVAL; |
| 84 | |
| 85 | if (devp) |
| 86 | *devp = dev; |
| 87 | if (offsetp) |
| 88 | *offsetp = offset; |
| 89 | if (gpiop) |
| 90 | *gpiop = uc_priv->gpio_base + offset; |
| 91 | |
| 92 | return 0; |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 93 | } |
| 94 | |
Simon Glass | 0dac4d5 | 2015-01-05 20:05:28 -0700 | [diff] [blame^] | 95 | int gpio_find_and_xlate(struct gpio_desc *desc, |
| 96 | struct fdtdec_phandle_args *args) |
| 97 | { |
| 98 | struct dm_gpio_ops *ops = gpio_get_ops(desc->dev); |
| 99 | |
| 100 | /* Use the first argument as the offset by default */ |
| 101 | if (args->args_count > 0) |
| 102 | desc->offset = args->args[0]; |
| 103 | else |
| 104 | desc->offset = -1; |
| 105 | desc->flags = 0; |
| 106 | |
| 107 | return ops->xlate ? ops->xlate(desc->dev, desc, args) : 0; |
| 108 | } |
| 109 | |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 110 | static int dm_gpio_request(struct gpio_desc *desc, const char *label) |
| 111 | { |
| 112 | struct udevice *dev = desc->dev; |
| 113 | struct gpio_dev_priv *uc_priv; |
| 114 | char *str; |
| 115 | int ret; |
| 116 | |
| 117 | uc_priv = dev->uclass_priv; |
| 118 | if (uc_priv->name[desc->offset]) |
| 119 | return -EBUSY; |
| 120 | str = strdup(label); |
| 121 | if (!str) |
| 122 | return -ENOMEM; |
| 123 | if (gpio_get_ops(dev)->request) { |
| 124 | ret = gpio_get_ops(dev)->request(dev, desc->offset, label); |
| 125 | if (ret) { |
| 126 | free(str); |
| 127 | return ret; |
| 128 | } |
| 129 | } |
| 130 | uc_priv->name[desc->offset] = str; |
| 131 | |
| 132 | return 0; |
| 133 | } |
| 134 | |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 135 | /** |
| 136 | * gpio_request() - [COMPAT] Request GPIO |
| 137 | * gpio: GPIO number |
| 138 | * label: Name for the requested GPIO |
| 139 | * |
Simon Glass | b892d12 | 2014-10-04 11:29:42 -0600 | [diff] [blame] | 140 | * The label is copied and allocated so the caller does not need to keep |
| 141 | * the pointer around. |
| 142 | * |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 143 | * This function implements the API that's compatible with current |
| 144 | * GPIO API used in U-Boot. The request is forwarded to particular |
| 145 | * GPIO driver. Returns 0 on success, negative value on error. |
| 146 | */ |
| 147 | int gpio_request(unsigned gpio, const char *label) |
| 148 | { |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 149 | struct gpio_desc desc; |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 150 | int ret; |
| 151 | |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 152 | ret = gpio_to_device(gpio, &desc); |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 153 | if (ret) |
| 154 | return ret; |
| 155 | |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 156 | return dm_gpio_request(&desc, label); |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | /** |
Simon Glass | d44f597 | 2014-10-04 11:29:49 -0600 | [diff] [blame] | 160 | * gpio_requestf() - [COMPAT] Request GPIO |
| 161 | * @gpio: GPIO number |
| 162 | * @fmt: Format string for the requested GPIO |
| 163 | * @...: Arguments for the printf() format string |
| 164 | * |
| 165 | * This function implements the API that's compatible with current |
| 166 | * GPIO API used in U-Boot. The request is forwarded to particular |
| 167 | * GPIO driver. Returns 0 on success, negative value on error. |
| 168 | */ |
| 169 | int gpio_requestf(unsigned gpio, const char *fmt, ...) |
| 170 | { |
| 171 | va_list args; |
| 172 | char buf[40]; |
| 173 | |
| 174 | va_start(args, fmt); |
| 175 | vscnprintf(buf, sizeof(buf), fmt, args); |
| 176 | va_end(args); |
| 177 | return gpio_request(gpio, buf); |
| 178 | } |
| 179 | |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 180 | int _dm_gpio_free(struct udevice *dev, uint offset) |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 181 | { |
Simon Glass | b892d12 | 2014-10-04 11:29:42 -0600 | [diff] [blame] | 182 | struct gpio_dev_priv *uc_priv; |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 183 | int ret; |
| 184 | |
Simon Glass | b892d12 | 2014-10-04 11:29:42 -0600 | [diff] [blame] | 185 | uc_priv = dev->uclass_priv; |
| 186 | if (!uc_priv->name[offset]) |
| 187 | return -ENXIO; |
| 188 | if (gpio_get_ops(dev)->free) { |
| 189 | ret = gpio_get_ops(dev)->free(dev, offset); |
| 190 | if (ret) |
| 191 | return ret; |
| 192 | } |
| 193 | |
| 194 | free(uc_priv->name[offset]); |
| 195 | uc_priv->name[offset] = NULL; |
| 196 | |
| 197 | return 0; |
| 198 | } |
| 199 | |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 200 | /** |
| 201 | * gpio_free() - [COMPAT] Relinquish GPIO |
| 202 | * gpio: GPIO number |
| 203 | * |
| 204 | * This function implements the API that's compatible with current |
| 205 | * GPIO API used in U-Boot. The request is forwarded to particular |
| 206 | * GPIO driver. Returns 0 on success, negative value on error. |
| 207 | */ |
| 208 | int gpio_free(unsigned gpio) |
Simon Glass | b892d12 | 2014-10-04 11:29:42 -0600 | [diff] [blame] | 209 | { |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 210 | struct gpio_desc desc; |
| 211 | int ret; |
Simon Glass | b892d12 | 2014-10-04 11:29:42 -0600 | [diff] [blame] | 212 | |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 213 | ret = gpio_to_device(gpio, &desc); |
| 214 | if (ret) |
| 215 | return ret; |
| 216 | |
| 217 | return _dm_gpio_free(desc.dev, desc.offset); |
| 218 | } |
| 219 | |
| 220 | static int check_reserved(struct gpio_desc *desc, const char *func) |
| 221 | { |
| 222 | struct gpio_dev_priv *uc_priv = desc->dev->uclass_priv; |
| 223 | |
| 224 | if (!uc_priv->name[desc->offset]) { |
Simon Glass | b892d12 | 2014-10-04 11:29:42 -0600 | [diff] [blame] | 225 | printf("%s: %s: error: gpio %s%d not reserved\n", |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 226 | desc->dev->name, func, |
| 227 | uc_priv->bank_name ? uc_priv->bank_name : "", |
| 228 | desc->offset); |
Simon Glass | b892d12 | 2014-10-04 11:29:42 -0600 | [diff] [blame] | 229 | return -EBUSY; |
| 230 | } |
| 231 | |
| 232 | return 0; |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 233 | } |
| 234 | |
| 235 | /** |
| 236 | * gpio_direction_input() - [COMPAT] Set GPIO direction to input |
| 237 | * gpio: GPIO number |
| 238 | * |
| 239 | * This function implements the API that's compatible with current |
| 240 | * GPIO API used in U-Boot. The request is forwarded to particular |
| 241 | * GPIO driver. Returns 0 on success, negative value on error. |
| 242 | */ |
| 243 | int gpio_direction_input(unsigned gpio) |
| 244 | { |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 245 | struct gpio_desc desc; |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 246 | int ret; |
| 247 | |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 248 | ret = gpio_to_device(gpio, &desc); |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 249 | if (ret) |
| 250 | return ret; |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 251 | ret = check_reserved(&desc, "dir_input"); |
| 252 | if (ret) |
| 253 | return ret; |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 254 | |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 255 | return gpio_get_ops(desc.dev)->direction_input(desc.dev, desc.offset); |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 256 | } |
| 257 | |
| 258 | /** |
| 259 | * gpio_direction_output() - [COMPAT] Set GPIO direction to output and set value |
| 260 | * gpio: GPIO number |
| 261 | * value: Logical value to be set on the GPIO pin |
| 262 | * |
| 263 | * This function implements the API that's compatible with current |
| 264 | * GPIO API used in U-Boot. The request is forwarded to particular |
| 265 | * GPIO driver. Returns 0 on success, negative value on error. |
| 266 | */ |
| 267 | int gpio_direction_output(unsigned gpio, int value) |
| 268 | { |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 269 | struct gpio_desc desc; |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 270 | int ret; |
| 271 | |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 272 | ret = gpio_to_device(gpio, &desc); |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 273 | if (ret) |
| 274 | return ret; |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 275 | ret = check_reserved(&desc, "dir_output"); |
| 276 | if (ret) |
| 277 | return ret; |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 278 | |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 279 | return gpio_get_ops(desc.dev)->direction_output(desc.dev, |
| 280 | desc.offset, value); |
| 281 | } |
| 282 | |
| 283 | int dm_gpio_get_value(struct gpio_desc *desc) |
| 284 | { |
| 285 | int value; |
| 286 | int ret; |
| 287 | |
| 288 | ret = check_reserved(desc, "get_value"); |
| 289 | if (ret) |
| 290 | return ret; |
| 291 | |
| 292 | value = gpio_get_ops(desc->dev)->get_value(desc->dev, desc->offset); |
| 293 | |
| 294 | return desc->flags & GPIOD_ACTIVE_LOW ? !value : value; |
| 295 | } |
| 296 | |
| 297 | int dm_gpio_set_value(struct gpio_desc *desc, int value) |
| 298 | { |
| 299 | int ret; |
| 300 | |
| 301 | ret = check_reserved(desc, "set_value"); |
| 302 | if (ret) |
| 303 | return ret; |
| 304 | |
| 305 | if (desc->flags & GPIOD_ACTIVE_LOW) |
| 306 | value = !value; |
| 307 | gpio_get_ops(desc->dev)->set_value(desc->dev, desc->offset, value); |
| 308 | return 0; |
| 309 | } |
| 310 | |
| 311 | int dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags) |
| 312 | { |
| 313 | struct udevice *dev = desc->dev; |
| 314 | struct dm_gpio_ops *ops = gpio_get_ops(dev); |
| 315 | int ret; |
| 316 | |
| 317 | ret = check_reserved(desc, "set_dir"); |
| 318 | if (ret) |
| 319 | return ret; |
| 320 | |
| 321 | if (flags & GPIOD_IS_OUT) { |
| 322 | int value = flags & GPIOD_IS_OUT_ACTIVE ? 1 : 0; |
| 323 | |
| 324 | if (flags & GPIOD_ACTIVE_LOW) |
| 325 | value = !value; |
| 326 | ret = ops->direction_output(dev, desc->offset, value); |
| 327 | } else if (flags & GPIOD_IS_IN) { |
| 328 | ret = ops->direction_input(dev, desc->offset); |
| 329 | } |
| 330 | if (ret) |
| 331 | return ret; |
| 332 | /* |
| 333 | * Update desc->flags here, so that GPIO_ACTIVE_LOW is honoured in |
| 334 | * futures |
| 335 | */ |
| 336 | desc->flags = flags; |
| 337 | |
| 338 | return 0; |
| 339 | } |
| 340 | |
| 341 | int dm_gpio_set_dir(struct gpio_desc *desc) |
| 342 | { |
| 343 | return dm_gpio_set_dir_flags(desc, desc->flags); |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 344 | } |
| 345 | |
| 346 | /** |
| 347 | * gpio_get_value() - [COMPAT] Sample GPIO pin and return it's value |
| 348 | * gpio: GPIO number |
| 349 | * |
| 350 | * This function implements the API that's compatible with current |
| 351 | * GPIO API used in U-Boot. The request is forwarded to particular |
| 352 | * GPIO driver. Returns the value of the GPIO pin, or negative value |
| 353 | * on error. |
| 354 | */ |
| 355 | int gpio_get_value(unsigned gpio) |
| 356 | { |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 357 | int ret; |
| 358 | |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 359 | struct gpio_desc desc; |
| 360 | |
| 361 | ret = gpio_to_device(gpio, &desc); |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 362 | if (ret) |
| 363 | return ret; |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 364 | return dm_gpio_get_value(&desc); |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 365 | } |
| 366 | |
| 367 | /** |
| 368 | * gpio_set_value() - [COMPAT] Configure logical value on GPIO pin |
| 369 | * gpio: GPIO number |
| 370 | * value: Logical value to be set on the GPIO pin. |
| 371 | * |
| 372 | * This function implements the API that's compatible with current |
| 373 | * GPIO API used in U-Boot. The request is forwarded to particular |
| 374 | * GPIO driver. Returns 0 on success, negative value on error. |
| 375 | */ |
| 376 | int gpio_set_value(unsigned gpio, int value) |
| 377 | { |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 378 | struct gpio_desc desc; |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 379 | int ret; |
| 380 | |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 381 | ret = gpio_to_device(gpio, &desc); |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 382 | if (ret) |
| 383 | return ret; |
Simon Glass | ae7123f | 2015-01-05 20:05:27 -0700 | [diff] [blame] | 384 | return dm_gpio_set_value(&desc, value); |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 385 | } |
| 386 | |
Heiko Schocher | 54c5d08 | 2014-05-22 12:43:05 +0200 | [diff] [blame] | 387 | const char *gpio_get_bank_info(struct udevice *dev, int *bit_count) |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 388 | { |
| 389 | struct gpio_dev_priv *priv; |
| 390 | |
| 391 | /* Must be called on an active device */ |
| 392 | priv = dev->uclass_priv; |
| 393 | assert(priv); |
| 394 | |
| 395 | *bit_count = priv->gpio_count; |
| 396 | return priv->bank_name; |
| 397 | } |
| 398 | |
Simon Glass | 6449a50 | 2014-10-04 11:29:43 -0600 | [diff] [blame] | 399 | static const char * const gpio_function[GPIOF_COUNT] = { |
| 400 | "input", |
| 401 | "output", |
| 402 | "unused", |
| 403 | "unknown", |
| 404 | "func", |
| 405 | }; |
| 406 | |
| 407 | int get_function(struct udevice *dev, int offset, bool skip_unused, |
| 408 | const char **namep) |
| 409 | { |
| 410 | struct gpio_dev_priv *uc_priv = dev->uclass_priv; |
| 411 | struct dm_gpio_ops *ops = gpio_get_ops(dev); |
| 412 | |
| 413 | BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function)); |
| 414 | if (!device_active(dev)) |
| 415 | return -ENODEV; |
| 416 | if (offset < 0 || offset >= uc_priv->gpio_count) |
| 417 | return -EINVAL; |
| 418 | if (namep) |
| 419 | *namep = uc_priv->name[offset]; |
| 420 | if (skip_unused && !uc_priv->name[offset]) |
| 421 | return GPIOF_UNUSED; |
| 422 | if (ops->get_function) { |
| 423 | int ret; |
| 424 | |
| 425 | ret = ops->get_function(dev, offset); |
| 426 | if (ret < 0) |
| 427 | return ret; |
| 428 | if (ret >= ARRAY_SIZE(gpio_function)) |
| 429 | return -ENODATA; |
| 430 | return ret; |
| 431 | } |
| 432 | |
| 433 | return GPIOF_UNKNOWN; |
| 434 | } |
| 435 | |
| 436 | int gpio_get_function(struct udevice *dev, int offset, const char **namep) |
| 437 | { |
| 438 | return get_function(dev, offset, true, namep); |
| 439 | } |
| 440 | |
| 441 | int gpio_get_raw_function(struct udevice *dev, int offset, const char **namep) |
| 442 | { |
| 443 | return get_function(dev, offset, false, namep); |
| 444 | } |
| 445 | |
Simon Glass | 0757535 | 2014-10-04 11:29:44 -0600 | [diff] [blame] | 446 | int gpio_get_status(struct udevice *dev, int offset, char *buf, int buffsize) |
| 447 | { |
| 448 | struct dm_gpio_ops *ops = gpio_get_ops(dev); |
| 449 | struct gpio_dev_priv *priv; |
| 450 | char *str = buf; |
| 451 | int func; |
| 452 | int ret; |
| 453 | int len; |
| 454 | |
| 455 | BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function)); |
| 456 | |
| 457 | *buf = 0; |
| 458 | priv = dev->uclass_priv; |
| 459 | ret = gpio_get_raw_function(dev, offset, NULL); |
| 460 | if (ret < 0) |
| 461 | return ret; |
| 462 | func = ret; |
| 463 | len = snprintf(str, buffsize, "%s%d: %s", |
| 464 | priv->bank_name ? priv->bank_name : "", |
| 465 | offset, gpio_function[func]); |
| 466 | if (func == GPIOF_INPUT || func == GPIOF_OUTPUT || |
| 467 | func == GPIOF_UNUSED) { |
| 468 | const char *label; |
| 469 | bool used; |
| 470 | |
| 471 | ret = ops->get_value(dev, offset); |
| 472 | if (ret < 0) |
| 473 | return ret; |
| 474 | used = gpio_get_function(dev, offset, &label) != GPIOF_UNUSED; |
| 475 | snprintf(str + len, buffsize - len, ": %d [%c]%s%s", |
| 476 | ret, |
| 477 | used ? 'x' : ' ', |
| 478 | used ? " " : "", |
| 479 | label ? label : ""); |
| 480 | } |
| 481 | |
| 482 | return 0; |
| 483 | } |
| 484 | |
Simon Glass | e5901c9 | 2014-11-10 18:00:21 -0700 | [diff] [blame] | 485 | /* |
| 486 | * get a number comprised of multiple GPIO values. gpio_num_array points to |
| 487 | * the array of gpio pin numbers to scan, terminated by -1. |
| 488 | */ |
| 489 | unsigned gpio_get_values_as_int(const int *gpio_num_array) |
| 490 | { |
| 491 | int gpio; |
| 492 | unsigned bitmask = 1; |
| 493 | unsigned vector = 0; |
| 494 | |
| 495 | while (bitmask && |
| 496 | ((gpio = *gpio_num_array++) != -1)) { |
| 497 | if (gpio_get_value(gpio)) |
| 498 | vector |= bitmask; |
| 499 | bitmask <<= 1; |
| 500 | } |
| 501 | return vector; |
| 502 | } |
| 503 | |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 504 | /* We need to renumber the GPIOs when any driver is probed/removed */ |
Simon Glass | b892d12 | 2014-10-04 11:29:42 -0600 | [diff] [blame] | 505 | static int gpio_renumber(struct udevice *removed_dev) |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 506 | { |
| 507 | struct gpio_dev_priv *uc_priv; |
Heiko Schocher | 54c5d08 | 2014-05-22 12:43:05 +0200 | [diff] [blame] | 508 | struct udevice *dev; |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 509 | struct uclass *uc; |
| 510 | unsigned base; |
| 511 | int ret; |
| 512 | |
| 513 | ret = uclass_get(UCLASS_GPIO, &uc); |
| 514 | if (ret) |
| 515 | return ret; |
| 516 | |
| 517 | /* Ensure that we have a base for each bank */ |
| 518 | base = 0; |
| 519 | uclass_foreach_dev(dev, uc) { |
Simon Glass | b892d12 | 2014-10-04 11:29:42 -0600 | [diff] [blame] | 520 | if (device_active(dev) && dev != removed_dev) { |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 521 | uc_priv = dev->uclass_priv; |
| 522 | uc_priv->gpio_base = base; |
| 523 | base += uc_priv->gpio_count; |
| 524 | } |
| 525 | } |
| 526 | |
| 527 | return 0; |
| 528 | } |
| 529 | |
Heiko Schocher | 54c5d08 | 2014-05-22 12:43:05 +0200 | [diff] [blame] | 530 | static int gpio_post_probe(struct udevice *dev) |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 531 | { |
Simon Glass | b892d12 | 2014-10-04 11:29:42 -0600 | [diff] [blame] | 532 | struct gpio_dev_priv *uc_priv = dev->uclass_priv; |
| 533 | |
| 534 | uc_priv->name = calloc(uc_priv->gpio_count, sizeof(char *)); |
| 535 | if (!uc_priv->name) |
| 536 | return -ENOMEM; |
| 537 | |
| 538 | return gpio_renumber(NULL); |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 539 | } |
| 540 | |
Heiko Schocher | 54c5d08 | 2014-05-22 12:43:05 +0200 | [diff] [blame] | 541 | static int gpio_pre_remove(struct udevice *dev) |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 542 | { |
Simon Glass | b892d12 | 2014-10-04 11:29:42 -0600 | [diff] [blame] | 543 | struct gpio_dev_priv *uc_priv = dev->uclass_priv; |
| 544 | int i; |
| 545 | |
| 546 | for (i = 0; i < uc_priv->gpio_count; i++) { |
| 547 | if (uc_priv->name[i]) |
| 548 | free(uc_priv->name[i]); |
| 549 | } |
| 550 | free(uc_priv->name); |
| 551 | |
| 552 | return gpio_renumber(dev); |
Simon Glass | 96495d9 | 2014-02-26 15:59:24 -0700 | [diff] [blame] | 553 | } |
| 554 | |
| 555 | UCLASS_DRIVER(gpio) = { |
| 556 | .id = UCLASS_GPIO, |
| 557 | .name = "gpio", |
| 558 | .post_probe = gpio_post_probe, |
| 559 | .pre_remove = gpio_pre_remove, |
| 560 | .per_device_auto_alloc_size = sizeof(struct gpio_dev_priv), |
| 561 | }; |