Greg Kroah-Hartman | c16854c | 2014-08-12 12:00:16 +0800 | [diff] [blame] | 1 | /* |
| 2 | * GPIO Greybus driver. |
| 3 | * |
| 4 | * Copyright 2014 Google Inc. |
| 5 | * |
| 6 | * Released under the GPLv2 only. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/gpio.h> |
| 13 | #include "greybus.h" |
| 14 | |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 15 | struct gb_gpio_line { |
| 16 | /* The following has to be an array of line_max entries */ |
| 17 | /* --> make them just a flags field */ |
| 18 | u8 active: 1, |
| 19 | direction: 1, /* 0 = output, 1 = input */ |
| 20 | value: 1; /* 0 = low, 1 = high */ |
| 21 | u16 debounce_usec; |
Greg Kroah-Hartman | c16854c | 2014-08-12 12:00:16 +0800 | [diff] [blame] | 22 | }; |
| 23 | |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 24 | struct gb_gpio_controller { |
| 25 | struct gb_connection *connection; |
| 26 | u8 version_major; |
| 27 | u8 version_minor; |
| 28 | u8 line_max; /* max line number */ |
| 29 | struct gb_gpio_line *lines; |
| 30 | |
| 31 | struct gpio_chip chip; |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 32 | }; |
| 33 | #define gpio_chip_to_gb_gpio_controller(chip) \ |
| 34 | container_of(chip, struct gb_gpio_controller, chip) |
| 35 | |
| 36 | /* Version of the Greybus GPIO protocol we support */ |
| 37 | #define GB_GPIO_VERSION_MAJOR 0x00 |
| 38 | #define GB_GPIO_VERSION_MINOR 0x01 |
| 39 | |
| 40 | /* Greybus GPIO request types */ |
| 41 | #define GB_GPIO_TYPE_INVALID 0x00 |
| 42 | #define GB_GPIO_TYPE_PROTOCOL_VERSION 0x01 |
| 43 | #define GB_GPIO_TYPE_LINE_COUNT 0x02 |
| 44 | #define GB_GPIO_TYPE_ACTIVATE 0x03 |
| 45 | #define GB_GPIO_TYPE_DEACTIVATE 0x04 |
| 46 | #define GB_GPIO_TYPE_GET_DIRECTION 0x05 |
| 47 | #define GB_GPIO_TYPE_DIRECTION_IN 0x06 |
| 48 | #define GB_GPIO_TYPE_DIRECTION_OUT 0x07 |
| 49 | #define GB_GPIO_TYPE_GET_VALUE 0x08 |
| 50 | #define GB_GPIO_TYPE_SET_VALUE 0x09 |
| 51 | #define GB_GPIO_TYPE_SET_DEBOUNCE 0x0a |
| 52 | #define GB_GPIO_TYPE_RESPONSE 0x80 /* OR'd with rest */ |
| 53 | |
| 54 | #define GB_GPIO_DEBOUNCE_USEC_DEFAULT 0 /* microseconds */ |
| 55 | |
| 56 | /* version request has no payload */ |
| 57 | struct gb_gpio_proto_version_response { |
| 58 | __u8 status; |
| 59 | __u8 major; |
| 60 | __u8 minor; |
Greg Kroah-Hartman | c16854c | 2014-08-12 12:00:16 +0800 | [diff] [blame] | 61 | }; |
| 62 | |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 63 | /* line count request has no payload */ |
| 64 | struct gb_gpio_line_count_response { |
| 65 | __u8 status; |
| 66 | __u8 count; |
| 67 | }; |
| 68 | |
| 69 | struct gb_gpio_activate_request { |
| 70 | __u8 which; |
| 71 | }; |
| 72 | struct gb_gpio_activate_response { |
| 73 | __u8 status; |
| 74 | }; |
| 75 | |
| 76 | struct gb_gpio_deactivate_request { |
| 77 | __u8 which; |
| 78 | }; |
| 79 | struct gb_gpio_deactivate_response { |
| 80 | __u8 status; |
| 81 | }; |
| 82 | |
| 83 | struct gb_gpio_get_direction_request { |
| 84 | __u8 which; |
| 85 | }; |
| 86 | struct gb_gpio_get_direction_response { |
| 87 | __u8 status; |
| 88 | __u8 direction; |
| 89 | }; |
| 90 | |
| 91 | struct gb_gpio_direction_in_request { |
| 92 | __u8 which; |
| 93 | }; |
| 94 | struct gb_gpio_direction_in_response { |
| 95 | __u8 status; |
| 96 | }; |
| 97 | |
| 98 | struct gb_gpio_direction_out_request { |
| 99 | __u8 which; |
| 100 | __u8 value; |
| 101 | }; |
| 102 | struct gb_gpio_direction_out_response { |
| 103 | __u8 status; |
| 104 | }; |
| 105 | |
| 106 | struct gb_gpio_get_value_request { |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 107 | __u8 which; |
| 108 | }; |
| 109 | struct gb_gpio_get_value_response { |
| 110 | __u8 status; |
| 111 | __u8 value; |
| 112 | }; |
| 113 | |
| 114 | struct gb_gpio_set_value_request { |
| 115 | __u8 which; |
| 116 | __u8 value; |
| 117 | }; |
| 118 | struct gb_gpio_set_value_response { |
| 119 | __u8 status; |
| 120 | }; |
| 121 | |
| 122 | struct gb_gpio_set_debounce_request { |
| 123 | __u8 which; |
| 124 | __le16 usec; |
| 125 | }; |
| 126 | struct gb_gpio_set_debounce_response { |
| 127 | __u8 status; |
| 128 | }; |
| 129 | |
| 130 | |
| 131 | /* |
| 132 | * This request only uses the connection field, and if successful, |
| 133 | * fills in the major and minor protocol version of the target. |
| 134 | */ |
| 135 | static int gb_gpio_proto_version_operation(struct gb_gpio_controller *gb_gpio_controller) |
Greg Kroah-Hartman | c16854c | 2014-08-12 12:00:16 +0800 | [diff] [blame] | 136 | { |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 137 | struct gb_connection *connection = gb_gpio_controller->connection; |
| 138 | struct gb_operation *operation; |
| 139 | struct gb_gpio_proto_version_response *response; |
| 140 | int ret; |
Greg Kroah-Hartman | c16854c | 2014-08-12 12:00:16 +0800 | [diff] [blame] | 141 | |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 142 | /* protocol version request has no payload */ |
| 143 | operation = gb_operation_create(connection, |
| 144 | GB_GPIO_TYPE_PROTOCOL_VERSION, |
| 145 | 0, sizeof(*response)); |
| 146 | if (!operation) |
Greg Kroah-Hartman | c16854c | 2014-08-12 12:00:16 +0800 | [diff] [blame] | 147 | return -ENOMEM; |
Greg Kroah-Hartman | c16854c | 2014-08-12 12:00:16 +0800 | [diff] [blame] | 148 | |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 149 | /* Synchronous operation--no callback */ |
| 150 | ret = gb_operation_request_send(operation, NULL); |
| 151 | if (ret) { |
| 152 | pr_err("version operation failed (%d)\n", ret); |
| 153 | goto out; |
Greg Kroah-Hartman | c16854c | 2014-08-12 12:00:16 +0800 | [diff] [blame] | 154 | } |
| 155 | |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 156 | response = operation->response_payload; |
| 157 | if (response->status) { |
| 158 | gb_connection_err(connection, "version response %hhu", |
| 159 | response->status); |
| 160 | ret = -EIO; |
| 161 | } else { |
| 162 | if (response->major > GB_GPIO_VERSION_MAJOR) { |
| 163 | pr_err("unsupported major version (%hhu > %hhu)\n", |
| 164 | response->major, GB_GPIO_VERSION_MAJOR); |
| 165 | ret = -ENOTSUPP; |
| 166 | goto out; |
| 167 | } |
| 168 | gb_gpio_controller->version_major = response->major; |
| 169 | gb_gpio_controller->version_minor = response->minor; |
| 170 | printk("%s: version_major = %u version_minor = %u\n", __func__, |
| 171 | gb_gpio_controller->version_major, gb_gpio_controller->version_minor); |
| 172 | } |
| 173 | out: |
| 174 | gb_operation_destroy(operation); |
| 175 | |
| 176 | return ret; |
| 177 | } |
| 178 | |
| 179 | static int gb_gpio_line_count_operation(struct gb_gpio_controller *gb_gpio_controller) |
| 180 | { |
| 181 | struct gb_connection *connection = gb_gpio_controller->connection; |
| 182 | struct gb_operation *operation; |
| 183 | struct gb_gpio_line_count_response *response; |
| 184 | int ret; |
| 185 | |
| 186 | /* line count request has no payload */ |
| 187 | operation = gb_operation_create(connection, |
| 188 | GB_GPIO_TYPE_LINE_COUNT, |
| 189 | 0, sizeof(*response)); |
| 190 | if (!operation) |
| 191 | return -ENOMEM; |
| 192 | |
| 193 | /* Synchronous operation--no callback */ |
| 194 | ret = gb_operation_request_send(operation, NULL); |
| 195 | if (ret) { |
| 196 | pr_err("line count operation failed (%d)\n", ret); |
| 197 | goto out; |
| 198 | } |
| 199 | |
| 200 | response = operation->response_payload; |
| 201 | if (response->status) { |
| 202 | gb_connection_err(connection, "line count response %hhu", |
| 203 | response->status); |
| 204 | ret = -EIO; |
| 205 | } else { |
| 206 | gb_gpio_controller->line_max = response->count; |
| 207 | printk("%s: count = %u\n", __func__, |
| 208 | gb_gpio_controller->line_max + 1); |
| 209 | } |
| 210 | out: |
| 211 | gb_operation_destroy(operation); |
| 212 | |
| 213 | return ret; |
| 214 | } |
| 215 | |
| 216 | static int gb_gpio_activate_operation(struct gb_gpio_controller *gb_gpio_controller, |
| 217 | u8 which) |
| 218 | { |
| 219 | struct gb_connection *connection = gb_gpio_controller->connection; |
| 220 | struct gb_operation *operation; |
| 221 | struct gb_gpio_activate_request *request; |
| 222 | struct gb_gpio_activate_response *response; |
| 223 | int ret; |
| 224 | |
| 225 | if (which > gb_gpio_controller->line_max) |
| 226 | return -EINVAL; |
| 227 | |
| 228 | /* activate response has no payload */ |
| 229 | operation = gb_operation_create(connection, |
| 230 | GB_GPIO_TYPE_ACTIVATE, |
| 231 | sizeof(*request), sizeof(*response)); |
| 232 | if (!operation) |
| 233 | return -ENOMEM; |
| 234 | request = operation->request_payload; |
| 235 | request->which = which; |
| 236 | |
| 237 | /* Synchronous operation--no callback */ |
| 238 | ret = gb_operation_request_send(operation, NULL); |
| 239 | if (ret) { |
| 240 | pr_err("activate operation failed (%d)\n", ret); |
| 241 | goto out; |
| 242 | } |
| 243 | |
| 244 | response = operation->response_payload; |
| 245 | if (response->status) { |
| 246 | gb_connection_err(connection, "activate response %hhu", |
| 247 | response->status); |
| 248 | ret = -EIO; |
| 249 | } else { |
| 250 | gb_gpio_controller->lines[which].active = true; |
| 251 | printk("%s: %u is now active\n", __func__, which); |
| 252 | } |
| 253 | out: |
| 254 | gb_operation_destroy(operation); |
| 255 | |
| 256 | return ret; |
| 257 | } |
| 258 | |
| 259 | static int gb_gpio_deactivate_operation(struct gb_gpio_controller *gb_gpio_controller, |
| 260 | u8 which) |
| 261 | { |
| 262 | struct gb_connection *connection = gb_gpio_controller->connection; |
| 263 | struct gb_operation *operation; |
| 264 | struct gb_gpio_deactivate_request *request; |
| 265 | struct gb_gpio_deactivate_response *response; |
| 266 | int ret; |
| 267 | |
| 268 | if (which > gb_gpio_controller->line_max) |
| 269 | return -EINVAL; |
| 270 | |
| 271 | /* deactivate response has no payload */ |
| 272 | operation = gb_operation_create(connection, |
| 273 | GB_GPIO_TYPE_DEACTIVATE, |
| 274 | sizeof(*request), sizeof(*response)); |
| 275 | if (!operation) |
| 276 | return -ENOMEM; |
| 277 | request = operation->request_payload; |
| 278 | request->which = which; |
| 279 | |
| 280 | /* Synchronous operation--no callback */ |
| 281 | ret = gb_operation_request_send(operation, NULL); |
| 282 | if (ret) { |
| 283 | pr_err("deactivate operation failed (%d)\n", ret); |
| 284 | goto out; |
| 285 | } |
| 286 | |
| 287 | response = operation->response_payload; |
| 288 | if (response->status) { |
| 289 | gb_connection_err(connection, "deactivate response %hhu", |
| 290 | response->status); |
| 291 | ret = -EIO; |
| 292 | } else { |
| 293 | gb_gpio_controller->lines[which].active = false; |
| 294 | printk("%s: %u is now inactive\n", __func__, which); |
| 295 | } |
| 296 | out: |
| 297 | gb_operation_destroy(operation); |
| 298 | |
| 299 | return ret; |
| 300 | } |
| 301 | |
| 302 | static int gb_gpio_get_direction_operation(struct gb_gpio_controller *gb_gpio_controller, |
| 303 | u8 which) |
| 304 | { |
| 305 | struct gb_connection *connection = gb_gpio_controller->connection; |
| 306 | struct gb_operation *operation; |
| 307 | struct gb_gpio_get_direction_request *request; |
| 308 | struct gb_gpio_get_direction_response *response; |
| 309 | int ret; |
| 310 | |
| 311 | if (which > gb_gpio_controller->line_max) |
| 312 | return -EINVAL; |
| 313 | |
| 314 | operation = gb_operation_create(connection, |
| 315 | GB_GPIO_TYPE_GET_DIRECTION, |
| 316 | sizeof(*request), sizeof(*response)); |
| 317 | if (!operation) |
| 318 | return -ENOMEM; |
| 319 | request = operation->request_payload; |
| 320 | request->which = which; |
| 321 | |
| 322 | /* Synchronous operation--no callback */ |
| 323 | ret = gb_operation_request_send(operation, NULL); |
| 324 | if (ret) { |
| 325 | pr_err("get direction operation failed (%d)\n", ret); |
| 326 | goto out; |
| 327 | } |
| 328 | |
| 329 | response = operation->response_payload; |
| 330 | if (response->status) { |
| 331 | gb_connection_err(connection, "get direction response %hhu", |
| 332 | response->status); |
| 333 | ret = -EIO; |
| 334 | } else { |
| 335 | u8 direction = response->direction; |
| 336 | |
| 337 | if (direction && direction != 1) |
| 338 | pr_warn("gpio %u direction was %u (should be 0 or 1)\n", |
| 339 | which, direction); |
| 340 | gb_gpio_controller->lines[which].direction = direction ? 1 : 0; |
| 341 | printk("%s: direction of %u is %s\n", __func__, which, |
| 342 | direction ? "in" : "out"); |
| 343 | } |
| 344 | out: |
| 345 | gb_operation_destroy(operation); |
| 346 | |
| 347 | return ret; |
| 348 | } |
| 349 | |
| 350 | static int gb_gpio_direction_in_operation(struct gb_gpio_controller *gb_gpio_controller, |
| 351 | u8 which) |
| 352 | { |
| 353 | struct gb_connection *connection = gb_gpio_controller->connection; |
| 354 | struct gb_operation *operation; |
| 355 | struct gb_gpio_direction_in_request *request; |
| 356 | struct gb_gpio_direction_in_response *response; |
| 357 | int ret; |
| 358 | |
| 359 | if (which > gb_gpio_controller->line_max) |
| 360 | return -EINVAL; |
| 361 | |
| 362 | /* direction_in response has no payload */ |
| 363 | operation = gb_operation_create(connection, |
| 364 | GB_GPIO_TYPE_DIRECTION_IN, |
| 365 | sizeof(*request), sizeof(*response)); |
| 366 | if (!operation) |
| 367 | return -ENOMEM; |
| 368 | request = operation->request_payload; |
| 369 | request->which = which; |
| 370 | |
| 371 | /* Synchronous operation--no callback */ |
| 372 | ret = gb_operation_request_send(operation, NULL); |
| 373 | if (ret) { |
| 374 | pr_err("direction in operation failed (%d)\n", ret); |
| 375 | goto out; |
| 376 | } |
| 377 | |
| 378 | response = operation->response_payload; |
| 379 | if (response->status) { |
| 380 | gb_connection_err(connection, "direction in response %hhu", |
| 381 | response->status); |
| 382 | ret = -EIO; |
| 383 | } else { |
| 384 | gb_gpio_controller->lines[which].direction = 1; |
| 385 | printk("%s: direction of %u is now in\n", __func__, which); |
| 386 | } |
| 387 | out: |
| 388 | gb_operation_destroy(operation); |
| 389 | |
| 390 | return ret; |
| 391 | } |
| 392 | |
| 393 | static int gb_gpio_direction_out_operation(struct gb_gpio_controller *gb_gpio_controller, |
| 394 | u8 which, bool value_high) |
| 395 | { |
| 396 | struct gb_connection *connection = gb_gpio_controller->connection; |
| 397 | struct gb_operation *operation; |
| 398 | struct gb_gpio_direction_out_request *request; |
| 399 | struct gb_gpio_direction_out_response *response; |
| 400 | int ret; |
| 401 | |
| 402 | if (which > gb_gpio_controller->line_max) |
| 403 | return -EINVAL; |
| 404 | |
| 405 | /* direction_out response has no payload */ |
| 406 | operation = gb_operation_create(connection, |
| 407 | GB_GPIO_TYPE_DIRECTION_OUT, |
| 408 | sizeof(*request), sizeof(*response)); |
| 409 | if (!operation) |
| 410 | return -ENOMEM; |
| 411 | request = operation->request_payload; |
| 412 | request->which = which; |
| 413 | request->value = value_high ? 1 : 0; |
| 414 | |
| 415 | /* Synchronous operation--no callback */ |
| 416 | ret = gb_operation_request_send(operation, NULL); |
| 417 | if (ret) { |
| 418 | pr_err("direction out operation failed (%d)\n", ret); |
| 419 | goto out; |
| 420 | } |
| 421 | |
| 422 | response = operation->response_payload; |
| 423 | if (response->status) { |
| 424 | gb_connection_err(connection, "direction out response %hhu", |
| 425 | response->status); |
| 426 | ret = -EIO; |
| 427 | } else { |
| 428 | gb_gpio_controller->lines[which].direction = 0; |
| 429 | printk("%s: direction of %u is now out, value %s\n", __func__, |
| 430 | which, value_high ? "high" : "low"); |
| 431 | } |
| 432 | out: |
| 433 | gb_operation_destroy(operation); |
| 434 | |
| 435 | return ret; |
| 436 | } |
| 437 | |
| 438 | static int gb_gpio_get_value_operation(struct gb_gpio_controller *gb_gpio_controller, |
| 439 | u8 which) |
| 440 | { |
| 441 | struct gb_connection *connection = gb_gpio_controller->connection; |
| 442 | struct gb_operation *operation; |
| 443 | struct gb_gpio_get_value_request *request; |
| 444 | struct gb_gpio_get_value_response *response; |
| 445 | int ret; |
| 446 | |
| 447 | if (which > gb_gpio_controller->line_max) |
| 448 | return -EINVAL; |
| 449 | |
| 450 | operation = gb_operation_create(connection, |
| 451 | GB_GPIO_TYPE_GET_VALUE, |
| 452 | sizeof(*request), sizeof(*response)); |
| 453 | if (!operation) |
| 454 | return -ENOMEM; |
| 455 | request = operation->request_payload; |
| 456 | request->which = which; |
| 457 | |
| 458 | /* Synchronous operation--no callback */ |
| 459 | ret = gb_operation_request_send(operation, NULL); |
| 460 | if (ret) { |
| 461 | pr_err("get value operation failed (%d)\n", ret); |
| 462 | goto out; |
| 463 | } |
| 464 | |
| 465 | response = operation->response_payload; |
| 466 | if (response->status) { |
| 467 | gb_connection_err(connection, "get value response %hhu", |
| 468 | response->status); |
| 469 | ret = -EIO; |
| 470 | } else { |
| 471 | u8 value = response->value; |
| 472 | |
| 473 | if (value && value != 1) |
| 474 | pr_warn("gpio %u value was %u (should be 0 or 1)\n", |
| 475 | which, value); |
| 476 | gb_gpio_controller->lines[which].value = value ? 1 : 0; |
| 477 | /* XXX should this set direction to out? */ |
| 478 | printk("%s: value of %u is %s\n", __func__, |
| 479 | which, gb_gpio_controller->lines[which].value ? "high" : "low"); |
| 480 | } |
| 481 | out: |
| 482 | gb_operation_destroy(operation); |
| 483 | |
| 484 | return ret; |
| 485 | } |
| 486 | |
| 487 | static int gb_gpio_set_value_operation(struct gb_gpio_controller *gb_gpio_controller, |
| 488 | u8 which, bool value_high) |
| 489 | { |
| 490 | struct gb_connection *connection = gb_gpio_controller->connection; |
| 491 | struct gb_operation *operation; |
| 492 | struct gb_gpio_set_value_request *request; |
| 493 | struct gb_gpio_set_value_response *response; |
| 494 | int ret; |
| 495 | |
| 496 | if (which > gb_gpio_controller->line_max) |
| 497 | return -EINVAL; |
| 498 | |
| 499 | /* set_value response has no payload */ |
| 500 | operation = gb_operation_create(connection, |
| 501 | GB_GPIO_TYPE_SET_VALUE, |
| 502 | sizeof(*request), sizeof(*response)); |
| 503 | if (!operation) |
| 504 | return -ENOMEM; |
| 505 | request = operation->request_payload; |
| 506 | request->which = which; |
| 507 | request->value = value_high ? 1 : 0; |
| 508 | |
| 509 | /* Synchronous operation--no callback */ |
| 510 | ret = gb_operation_request_send(operation, NULL); |
| 511 | if (ret) { |
| 512 | pr_err("set value operation failed (%d)\n", ret); |
| 513 | goto out; |
| 514 | } |
| 515 | |
| 516 | response = operation->response_payload; |
| 517 | if (response->status) { |
| 518 | gb_connection_err(connection, "set value response %hhu", |
| 519 | response->status); |
| 520 | ret = -EIO; |
| 521 | } else { |
| 522 | /* XXX should this set direction to out? */ |
| 523 | gb_gpio_controller->lines[which].value = request->value; |
| 524 | printk("%s: out value of %u is now %s\n", __func__, |
| 525 | which, gb_gpio_controller->lines[which].value ? "high" : "low"); |
| 526 | } |
| 527 | out: |
| 528 | gb_operation_destroy(operation); |
| 529 | |
| 530 | return ret; |
| 531 | } |
| 532 | |
| 533 | static int gb_gpio_set_debounce_operation(struct gb_gpio_controller *gb_gpio_controller, |
| 534 | u8 which, u16 debounce_usec) |
| 535 | { |
| 536 | struct gb_connection *connection = gb_gpio_controller->connection; |
| 537 | struct gb_operation *operation; |
| 538 | struct gb_gpio_set_debounce_request *request; |
| 539 | struct gb_gpio_set_debounce_response *response; |
| 540 | int ret; |
| 541 | |
| 542 | if (which > gb_gpio_controller->line_max) |
| 543 | return -EINVAL; |
| 544 | |
| 545 | /* set_debounce response has no payload */ |
| 546 | operation = gb_operation_create(connection, |
| 547 | GB_GPIO_TYPE_SET_DEBOUNCE, |
| 548 | sizeof(*request), sizeof(*response)); |
| 549 | if (!operation) |
| 550 | return -ENOMEM; |
| 551 | request = operation->request_payload; |
| 552 | request->which = which; |
Greg Kroah-Hartman | d4c8247 | 2014-10-27 12:33:47 +0800 | [diff] [blame] | 553 | request->usec = cpu_to_le16(debounce_usec); |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 554 | |
| 555 | /* Synchronous operation--no callback */ |
| 556 | ret = gb_operation_request_send(operation, NULL); |
| 557 | if (ret) { |
| 558 | pr_err("set debounce operation failed (%d)\n", ret); |
| 559 | goto out; |
| 560 | } |
| 561 | |
| 562 | response = operation->response_payload; |
| 563 | if (response->status) { |
| 564 | gb_connection_err(connection, "set debounce response %hhu", |
| 565 | response->status); |
| 566 | ret = -EIO; |
| 567 | } else { |
Greg Kroah-Hartman | d4c8247 | 2014-10-27 12:33:47 +0800 | [diff] [blame] | 568 | gb_gpio_controller->lines[which].debounce_usec = le16_to_cpu(request->usec); |
| 569 | printk("%s: debounce of %u is now %hu usec\n", __func__, which, |
| 570 | gb_gpio_controller->lines[which].debounce_usec); |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 571 | } |
| 572 | out: |
| 573 | gb_operation_destroy(operation); |
| 574 | |
| 575 | return ret; |
| 576 | } |
| 577 | |
| 578 | static int gb_gpio_request(struct gpio_chip *chip, unsigned offset) |
| 579 | { |
| 580 | struct gb_gpio_controller *gb_gpio_controller = gpio_chip_to_gb_gpio_controller(chip); |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 581 | int ret; |
| 582 | |
Matt Porter | ff6e0b9 | 2014-10-20 06:39:45 -0400 | [diff] [blame] | 583 | if (offset < 0 || offset >= chip->ngpio) |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 584 | return -EINVAL; |
Matt Porter | ff6e0b9 | 2014-10-20 06:39:45 -0400 | [diff] [blame] | 585 | printk("passed check\n"); |
| 586 | ret = gb_gpio_activate_operation(gb_gpio_controller, (u8)offset); |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 587 | if (ret) |
| 588 | ; /* return ret; */ |
Greg Kroah-Hartman | c16854c | 2014-08-12 12:00:16 +0800 | [diff] [blame] | 589 | return 0; |
| 590 | } |
| 591 | |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 592 | static void gb_gpio_free(struct gpio_chip *chip, unsigned offset) |
Greg Kroah-Hartman | c16854c | 2014-08-12 12:00:16 +0800 | [diff] [blame] | 593 | { |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 594 | struct gb_gpio_controller *gb_gpio_controller = gpio_chip_to_gb_gpio_controller(chip); |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 595 | int ret; |
Greg Kroah-Hartman | c16854c | 2014-08-12 12:00:16 +0800 | [diff] [blame] | 596 | |
Matt Porter | ff6e0b9 | 2014-10-20 06:39:45 -0400 | [diff] [blame] | 597 | if (offset < 0 || offset >= chip->ngpio) { |
| 598 | pr_err("bad offset %u supplied (must be 0..%u)\n", |
| 599 | offset, chip->ngpio - 1); |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 600 | return; |
| 601 | } |
Matt Porter | ff6e0b9 | 2014-10-20 06:39:45 -0400 | [diff] [blame] | 602 | ret = gb_gpio_deactivate_operation(gb_gpio_controller, (u8)offset); |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 603 | if (ret) |
| 604 | ; /* return ret; */ |
| 605 | } |
| 606 | |
| 607 | static int gb_gpio_get_direction(struct gpio_chip *chip, unsigned offset) |
| 608 | { |
| 609 | struct gb_gpio_controller *gb_gpio_controller = gpio_chip_to_gb_gpio_controller(chip); |
| 610 | u8 which; |
| 611 | int ret; |
| 612 | |
Matt Porter | ff6e0b9 | 2014-10-20 06:39:45 -0400 | [diff] [blame] | 613 | if (offset < 0 || offset >= chip->ngpio) |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 614 | return -EINVAL; |
Matt Porter | ff6e0b9 | 2014-10-20 06:39:45 -0400 | [diff] [blame] | 615 | which = (u8)offset; |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 616 | ret = gb_gpio_get_direction_operation(gb_gpio_controller, which); |
| 617 | if (ret) |
| 618 | ; /* return ret; */ |
| 619 | return gb_gpio_controller->lines[which].direction ? 1 : 0; |
| 620 | } |
| 621 | |
| 622 | static int gb_gpio_direction_input(struct gpio_chip *chip, unsigned offset) |
| 623 | { |
| 624 | struct gb_gpio_controller *gb_gpio_controller = gpio_chip_to_gb_gpio_controller(chip); |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 625 | int ret; |
| 626 | |
Matt Porter | ff6e0b9 | 2014-10-20 06:39:45 -0400 | [diff] [blame] | 627 | if (offset < 0 || offset >= chip->ngpio) |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 628 | return -EINVAL; |
Matt Porter | ff6e0b9 | 2014-10-20 06:39:45 -0400 | [diff] [blame] | 629 | ret = gb_gpio_direction_in_operation(gb_gpio_controller, (u8)offset); |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 630 | if (ret) |
| 631 | ; /* return ret; */ |
| 632 | return 0; |
| 633 | } |
| 634 | |
| 635 | static int gb_gpio_direction_output(struct gpio_chip *chip, unsigned offset, |
| 636 | int value) |
| 637 | { |
| 638 | struct gb_gpio_controller *gb_gpio_controller = gpio_chip_to_gb_gpio_controller(chip); |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 639 | int ret; |
| 640 | |
Matt Porter | ff6e0b9 | 2014-10-20 06:39:45 -0400 | [diff] [blame] | 641 | if (offset < 0 || offset >= chip->ngpio) |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 642 | return -EINVAL; |
Matt Porter | ff6e0b9 | 2014-10-20 06:39:45 -0400 | [diff] [blame] | 643 | ret = gb_gpio_direction_out_operation(gb_gpio_controller, (u8)offset, !!value); |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 644 | if (ret) |
| 645 | ; /* return ret; */ |
| 646 | return 0; |
| 647 | } |
| 648 | |
| 649 | static int gb_gpio_get(struct gpio_chip *chip, unsigned offset) |
| 650 | { |
| 651 | struct gb_gpio_controller *gb_gpio_controller = gpio_chip_to_gb_gpio_controller(chip); |
| 652 | u8 which; |
| 653 | int ret; |
| 654 | |
Matt Porter | ff6e0b9 | 2014-10-20 06:39:45 -0400 | [diff] [blame] | 655 | if (offset < 0 || offset >= chip->ngpio) |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 656 | return -EINVAL; |
Matt Porter | ff6e0b9 | 2014-10-20 06:39:45 -0400 | [diff] [blame] | 657 | which = (u8)offset; |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 658 | ret = gb_gpio_get_value_operation(gb_gpio_controller, which); |
| 659 | if (ret) |
| 660 | return ret; |
| 661 | return (int)gb_gpio_controller->lines[which].value; |
| 662 | } |
| 663 | |
| 664 | static void gb_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
| 665 | { |
| 666 | struct gb_gpio_controller *gb_gpio_controller = gpio_chip_to_gb_gpio_controller(chip); |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 667 | int ret; |
| 668 | |
Matt Porter | ff6e0b9 | 2014-10-20 06:39:45 -0400 | [diff] [blame] | 669 | if (offset < 0 || offset >= chip->ngpio) { |
| 670 | pr_err("bad offset %u supplied (must be 0..%u)\n", |
| 671 | offset, chip->ngpio - 1); |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 672 | return; |
| 673 | } |
Matt Porter | ff6e0b9 | 2014-10-20 06:39:45 -0400 | [diff] [blame] | 674 | ret = gb_gpio_set_value_operation(gb_gpio_controller, (u8)offset, !!value); |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 675 | if (ret) |
| 676 | ; /* return ret; */ |
| 677 | } |
| 678 | |
| 679 | static int gb_gpio_set_debounce(struct gpio_chip *chip, unsigned offset, |
| 680 | unsigned debounce) |
| 681 | { |
| 682 | struct gb_gpio_controller *gb_gpio_controller = gpio_chip_to_gb_gpio_controller(chip); |
| 683 | u16 usec; |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 684 | int ret; |
| 685 | |
Matt Porter | ff6e0b9 | 2014-10-20 06:39:45 -0400 | [diff] [blame] | 686 | if (offset < 0 || offset >= chip->ngpio) |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 687 | return -EINVAL; |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 688 | if (debounce > (unsigned int)U16_MAX) |
| 689 | return -EINVAL; |
| 690 | usec = (u8)debounce; |
Matt Porter | ff6e0b9 | 2014-10-20 06:39:45 -0400 | [diff] [blame] | 691 | ret = gb_gpio_set_debounce_operation(gb_gpio_controller, (u8)offset, usec); |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 692 | if (ret) |
| 693 | ; /* return ret; */ |
| 694 | |
| 695 | return 0; /* XXX */ |
| 696 | } |
| 697 | |
| 698 | static int gb_gpio_to_irq(struct gpio_chip *chip, unsigned offset) |
| 699 | { |
Matt Porter | ff6e0b9 | 2014-10-20 06:39:45 -0400 | [diff] [blame] | 700 | if (offset < 0 || offset >= chip->ngpio) |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 701 | return -EINVAL; |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 702 | |
| 703 | return 0; /* XXX */ |
| 704 | } |
| 705 | |
| 706 | static void gb_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) |
| 707 | { |
| 708 | return; /* XXX */ |
| 709 | } |
| 710 | |
Greg Kroah-Hartman | d4c8247 | 2014-10-27 12:33:47 +0800 | [diff] [blame] | 711 | static int gb_gpio_controller_setup(struct gb_gpio_controller *gb_gpio_controller) |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 712 | { |
| 713 | u32 line_count; |
| 714 | size_t size; |
| 715 | int ret; |
| 716 | |
| 717 | /* First thing we need to do is check the version */ |
| 718 | ret = gb_gpio_proto_version_operation(gb_gpio_controller); |
| 719 | if (ret) |
| 720 | ; /* return ret; */ |
| 721 | |
| 722 | /* Now find out how many lines there are */ |
| 723 | ret = gb_gpio_line_count_operation(gb_gpio_controller); |
| 724 | if (ret) |
| 725 | ; /* return ret; */ |
| 726 | line_count = (u32)gb_gpio_controller->line_max + 1; |
| 727 | size = line_count * sizeof(*gb_gpio_controller->lines); |
| 728 | gb_gpio_controller->lines = kzalloc(size, GFP_KERNEL); |
| 729 | if (!gb_gpio_controller->lines) |
| 730 | return -ENOMEM; |
| 731 | |
| 732 | return ret; |
| 733 | } |
| 734 | |
Alex Elder | 3689f97 | 2014-10-27 06:04:30 -0500 | [diff] [blame] | 735 | static int gb_gpio_connection_init(struct gb_connection *connection) |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 736 | { |
| 737 | struct gb_gpio_controller *gb_gpio_controller; |
| 738 | struct gpio_chip *gpio; |
| 739 | int ret; |
| 740 | |
| 741 | gb_gpio_controller = kzalloc(sizeof(*gb_gpio_controller), GFP_KERNEL); |
| 742 | if (!gb_gpio_controller) |
| 743 | return -ENOMEM; |
| 744 | gb_gpio_controller->connection = connection; |
| 745 | |
| 746 | ret = gb_gpio_controller_setup(gb_gpio_controller); |
| 747 | if (ret) |
| 748 | goto out_err; |
| 749 | |
| 750 | gpio = &gb_gpio_controller->chip; |
| 751 | |
| 752 | gpio->label = "greybus_gpio"; |
| 753 | gpio->owner = THIS_MODULE; /* XXX Module get? */ |
| 754 | |
| 755 | gpio->request = gb_gpio_request; |
| 756 | gpio->free = gb_gpio_free; |
| 757 | gpio->get_direction = gb_gpio_get_direction; |
| 758 | gpio->direction_input = gb_gpio_direction_input; |
| 759 | gpio->direction_output = gb_gpio_direction_output; |
| 760 | gpio->get = gb_gpio_get; |
| 761 | gpio->set = gb_gpio_set; |
| 762 | gpio->set_debounce = gb_gpio_set_debounce; |
| 763 | gpio->to_irq = gb_gpio_to_irq; |
| 764 | gpio->dbg_show = gb_gpio_dbg_show; |
| 765 | |
| 766 | gpio->base = -1; /* Allocate base dynamically */ |
| 767 | gpio->ngpio = gb_gpio_controller->line_max + 1; |
| 768 | gpio->can_sleep = true; /* XXX */ |
| 769 | |
| 770 | ret = gpiochip_add(gpio); |
| 771 | if (ret) { |
| 772 | pr_err("Failed to register GPIO\n"); |
| 773 | return ret; |
| 774 | } |
| 775 | connection->private = gb_gpio_controller; |
| 776 | |
| 777 | return 0; |
| 778 | out_err: |
| 779 | kfree(gb_gpio_controller); |
| 780 | return ret; |
| 781 | } |
| 782 | |
Alex Elder | 3689f97 | 2014-10-27 06:04:30 -0500 | [diff] [blame] | 783 | static void gb_gpio_connection_exit(struct gb_connection *connection) |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 784 | { |
| 785 | struct gb_gpio_controller *gb_gpio_controller = connection->private; |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 786 | |
| 787 | if (!gb_gpio_controller) |
Alex Elder | 051fb04 | 2014-10-16 06:35:24 -0500 | [diff] [blame] | 788 | return; |
Greg Kroah-Hartman | c16854c | 2014-08-12 12:00:16 +0800 | [diff] [blame] | 789 | |
Greg Kroah-Hartman | 213aefe | 2014-10-20 13:40:02 +0800 | [diff] [blame] | 790 | gb_gpiochip_remove(&gb_gpio_controller->chip); |
Alex Elder | bb2e1c9 | 2014-10-16 06:35:39 -0500 | [diff] [blame] | 791 | /* kref_put(gb_gpio_controller->connection) */ |
| 792 | kfree(gb_gpio_controller); |
Greg Kroah-Hartman | c16854c | 2014-08-12 12:00:16 +0800 | [diff] [blame] | 793 | } |
| 794 | |
Alex Elder | 19d03de | 2014-11-05 16:12:53 -0600 | [diff] [blame] | 795 | static struct gb_protocol gpio_protocol = { |
| 796 | .id = GREYBUS_PROTOCOL_GPIO, |
| 797 | .major = 0, |
| 798 | .minor = 1, |
Alex Elder | 5d9fd7e | 2014-11-05 16:12:54 -0600 | [diff] [blame] | 799 | .connection_init = gb_gpio_connection_init, |
| 800 | .connection_exit = gb_gpio_connection_exit, |
Alex Elder | f8fb05e | 2014-11-05 16:12:55 -0600 | [diff] [blame] | 801 | .request_recv = NULL, /* no incoming requests */ |
Alex Elder | 19d03de | 2014-11-05 16:12:53 -0600 | [diff] [blame] | 802 | }; |
| 803 | |
| 804 | bool gb_gpio_protocol_init(void) |
| 805 | { |
| 806 | return gb_protocol_register(&gpio_protocol); |
| 807 | } |
| 808 | |
| 809 | void gb_gpio_protocol_exit(void) |
| 810 | { |
| 811 | gb_protocol_deregister(&gpio_protocol); |
| 812 | } |