Tai Kuo | f81f4a1 | 2021-02-11 16:22:44 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | |
| 3 | #include <linux/module.h> |
| 4 | #include <linux/fs.h> |
| 5 | #include <linux/slab.h> |
| 6 | #include <linux/uaccess.h> |
| 7 | #include <linux/poll.h> |
| 8 | |
| 9 | #include "touch_offload.h" |
| 10 | |
| 11 | static int touch_offload_open(struct inode *inode, struct file *file) |
| 12 | { |
| 13 | struct touch_offload_context *context = |
| 14 | container_of(inode->i_cdev, struct touch_offload_context, dev); |
| 15 | |
| 16 | file->private_data = context; |
| 17 | pr_debug("%s\n", __func__); |
| 18 | |
| 19 | mutex_lock(&context->file_lock); |
| 20 | if (context->file_in_use) { |
| 21 | mutex_unlock(&context->file_lock); |
| 22 | return -EBUSY; |
| 23 | } |
| 24 | context->file_in_use = true; |
| 25 | mutex_unlock(&context->file_lock); |
| 26 | |
| 27 | /* Prepare context for consumer. E.g., event queue */ |
| 28 | return 0; |
| 29 | } |
| 30 | |
| 31 | static int touch_offload_release(struct inode *inode, struct file *file) |
| 32 | { |
| 33 | struct touch_offload_context *context = file->private_data; |
| 34 | |
| 35 | mutex_lock(&context->file_lock); |
| 36 | context->file_in_use = false; |
| 37 | mutex_unlock(&context->file_lock); |
| 38 | |
| 39 | pr_debug("%s\n", __func__); |
| 40 | return 0; |
| 41 | } |
| 42 | |
| 43 | static int pack_frame(struct touch_offload_context *context, |
| 44 | struct touch_offload_frame *frame, char **packed) |
| 45 | { |
| 46 | /* TODO: compute precise size of a packed frame */ |
| 47 | int max_packed_frame_size = |
| 48 | sizeof(struct touch_offload_frame) + |
| 49 | TOUCH_OFFLOAD_DATA_SIZE_2D(context->caps.rx_size, |
| 50 | context->caps.tx_size) * |
| 51 | MAX_CHANNELS; |
| 52 | /* TODO: preallocate memory for a single packed frame */ |
| 53 | char *packed_mem = NULL; |
| 54 | char *ptr = NULL; |
| 55 | int channel_size; |
| 56 | int i = 0; |
| 57 | |
| 58 | if (!frame || frame->num_channels > MAX_CHANNELS) |
| 59 | return -EINVAL; |
| 60 | |
| 61 | packed_mem = kzalloc(max_packed_frame_size, GFP_KERNEL); |
| 62 | if (packed_mem == NULL) |
| 63 | return -ENOMEM; |
| 64 | ptr = packed_mem; |
| 65 | |
| 66 | /* Copy the header */ |
| 67 | |
| 68 | memcpy(ptr, &frame->header, sizeof(frame->header)); |
| 69 | ptr += sizeof(frame->header); |
| 70 | |
| 71 | /* Copy frame data */ |
| 72 | |
| 73 | for (i = 0; i < frame->num_channels; i++) { |
| 74 | if (frame->channel_type[i] == TOUCH_DATA_TYPE_COORD) |
| 75 | channel_size = TOUCH_OFFLOAD_FRAME_SIZE_COORD; |
| 76 | else if ((frame->channel_type[i] & TOUCH_SCAN_TYPE_MUTUAL) != 0) |
| 77 | channel_size = |
| 78 | TOUCH_OFFLOAD_FRAME_SIZE_2D(context->caps.rx_size, |
| 79 | context->caps.tx_size); |
| 80 | else if ((frame->channel_type[i] & TOUCH_SCAN_TYPE_SELF) != 0) |
| 81 | channel_size = |
| 82 | TOUCH_OFFLOAD_FRAME_SIZE_1D(context->caps.rx_size, |
| 83 | context->caps.tx_size); |
Steve Pfetsch | df0f0a6 | 2022-01-13 19:07:27 +0000 | [diff] [blame] | 84 | else if (frame->channel_type[i] == |
| 85 | CONTEXT_CHANNEL_TYPE_DRIVER_STATUS) |
| 86 | channel_size = TOUCH_OFFLOAD_FRAME_SIZE_DRIVER_STATUS; |
| 87 | else if (frame->channel_type[i] == |
| 88 | CONTEXT_CHANNEL_TYPE_STYLUS_STATUS) |
| 89 | channel_size = TOUCH_OFFLOAD_FRAME_SIZE_STYLUS_STATUS; |
Tai Kuo | f81f4a1 | 2021-02-11 16:22:44 +0800 | [diff] [blame] | 90 | else { |
| 91 | pr_err("%s: Invalid channel_type = 0x%08X", __func__, |
| 92 | frame->channel_type[i]); |
| 93 | kfree(packed_mem); |
| 94 | return -EINVAL; |
| 95 | } |
| 96 | memcpy(ptr, frame->channel_data[i], channel_size); |
| 97 | ptr += channel_size; |
| 98 | } |
| 99 | |
| 100 | *packed = packed_mem; |
| 101 | return (ptr - packed_mem); |
| 102 | } |
| 103 | |
| 104 | static ssize_t touch_offload_read(struct file *file, char __user *user_buffer, |
| 105 | size_t size, loff_t *offset) |
| 106 | { |
| 107 | struct touch_offload_context *context = file->private_data; |
| 108 | struct touch_offload_frame *frame; |
| 109 | size_t copy_size; |
| 110 | int result; |
| 111 | unsigned long remaining; |
| 112 | |
| 113 | pr_debug("%s\n", __func__); |
| 114 | |
| 115 | if (context->num_buffers == 0) |
| 116 | return -EINVAL; |
| 117 | |
| 118 | /* Block until touch events occur */ |
| 119 | /* Block (on completion?) until len >= 0. */ |
| 120 | /* Lock the event buffer */ |
| 121 | /* Copy contents of event buffer to service */ |
| 122 | /* Reset completion since len=0 */ |
| 123 | /* Unlock and return */ |
| 124 | |
| 125 | /* If the end of the data is reached, free the packed_frame and |
| 126 | * return 0 |
| 127 | */ |
| 128 | |
| 129 | mutex_lock(&context->buffer_lock); |
| 130 | |
| 131 | if (context->packed_frame != NULL && |
| 132 | *offset == context->packed_frame_size) { |
| 133 | pr_err("%s: [Unexpected!] The buffer should have been recycled after the previous read.\n", |
| 134 | __func__); |
| 135 | kfree(context->packed_frame); |
| 136 | context->packed_frame = NULL; |
| 137 | *offset = 0; |
| 138 | mutex_unlock(&context->buffer_lock); |
| 139 | return 0; |
| 140 | } else if (context->packed_frame == NULL) { |
| 141 | /* Process the next queued buffer */ |
| 142 | |
| 143 | while (list_empty(&context->frame_queue)) { |
| 144 | /* Presumably more buffers on the way, so block */ |
| 145 | mutex_unlock(&context->buffer_lock); |
| 146 | |
| 147 | /* Non-blocking read? */ |
| 148 | if (file->f_flags & O_NONBLOCK) |
| 149 | return -EAGAIN; |
| 150 | |
| 151 | /* Block until data is available */ |
| 152 | if (wait_event_interruptible(context->read_queue, |
| 153 | !list_empty(&context->frame_queue))) |
| 154 | return -ERESTARTSYS; |
| 155 | |
| 156 | /* Check that the pipeline is still running */ |
| 157 | mutex_lock(&context->buffer_lock); |
| 158 | } |
| 159 | |
| 160 | frame = list_entry(context->frame_queue.next, |
| 161 | struct touch_offload_frame, entry); |
| 162 | list_del(&frame->entry); |
| 163 | |
| 164 | result = pack_frame(context, frame, &context->packed_frame); |
| 165 | list_add_tail(&frame->entry, &context->free_pool); |
| 166 | if (result <= 0) { |
| 167 | pr_err("%s: Error packing frame! Result = %d.\n", |
| 168 | __func__, result); |
| 169 | mutex_unlock(&context->buffer_lock); |
| 170 | return -EINVAL; |
| 171 | } |
| 172 | if (result != context->packed_frame_size) { |
| 173 | pr_err("%s: Packed frame size (%d) does not match size allocated per frame(%d)!\n", |
| 174 | __func__, result, context->packed_frame_size); |
| 175 | } |
| 176 | |
| 177 | } |
| 178 | |
| 179 | /* Transfer the maximum amount of data */ |
| 180 | copy_size = min((long long)size, context->packed_frame_size - *offset); |
| 181 | remaining = copy_to_user(user_buffer, context->packed_frame + *offset, |
| 182 | copy_size); |
| 183 | if (remaining != 0) |
| 184 | pr_err("%s: copy_to_user unexpectedly failed to copy %lu bytes.\n", |
| 185 | __func__, remaining); |
| 186 | *offset += copy_size - remaining; |
| 187 | |
| 188 | /* Recycle the frame if transfer was complete */ |
| 189 | if (*offset == context->packed_frame_size) { |
| 190 | kfree(context->packed_frame); |
| 191 | context->packed_frame = NULL; |
| 192 | *offset = 0; |
| 193 | } |
| 194 | |
| 195 | mutex_unlock(&context->buffer_lock); |
| 196 | |
| 197 | return copy_size - remaining; |
| 198 | } |
| 199 | |
| 200 | static unsigned int touch_offload_poll(struct file *file, |
| 201 | struct poll_table_struct *wait) |
| 202 | { |
| 203 | struct touch_offload_context *context = file->private_data; |
| 204 | unsigned int flags = 0; |
| 205 | |
| 206 | pr_debug("%s\n", __func__); |
| 207 | |
| 208 | poll_wait(file, &context->read_queue, wait); |
| 209 | |
| 210 | mutex_lock(&context->buffer_lock); |
| 211 | |
| 212 | if (context->packed_frame || !list_empty(&context->frame_queue)) |
| 213 | flags |= POLLIN | POLLRDNORM; |
| 214 | |
| 215 | mutex_unlock(&context->buffer_lock); |
| 216 | return flags; |
| 217 | } |
| 218 | |
| 219 | static int touch_offload_allocate_buffers(struct touch_offload_context *context, |
| 220 | int nb) |
| 221 | { |
| 222 | struct touch_offload_frame *frame = NULL; |
| 223 | int i; |
| 224 | int num_channels; |
| 225 | __u32 mask; |
| 226 | __u32 size = 0; |
| 227 | |
| 228 | pr_debug("%s\n", __func__); |
| 229 | |
| 230 | num_channels = (context->config.read_coords ? 1 : 0) + |
| 231 | hweight_long(context->config.mutual_data_types) + |
Steve Pfetsch | df0f0a6 | 2022-01-13 19:07:27 +0000 | [diff] [blame] | 232 | hweight_long(context->config.self_data_types) + |
| 233 | hweight_long(context->config.context_channel_types); |
Tai Kuo | f81f4a1 | 2021-02-11 16:22:44 +0800 | [diff] [blame] | 234 | if (num_channels == 0 || num_channels > MAX_CHANNELS) { |
| 235 | pr_err("%s: Configuration enables more (%d) than %d channels!\n", |
| 236 | __func__, num_channels, MAX_CHANNELS); |
| 237 | return -EINVAL; |
| 238 | } |
| 239 | |
| 240 | |
| 241 | mutex_lock(&context->buffer_lock); |
| 242 | |
| 243 | /* Add new buffers to the free_pool */ |
| 244 | for (i = 0; i < nb; i++) { |
| 245 | int chan = 0; |
| 246 | struct touch_offload_frame *frame = |
| 247 | kzalloc(sizeof(struct touch_offload_frame), GFP_KERNEL); |
| 248 | |
| 249 | if (frame == NULL) { |
| 250 | mutex_unlock(&context->buffer_lock); |
| 251 | return -ENOMEM; |
| 252 | } |
| 253 | |
| 254 | frame->header.frame_size = sizeof(frame->header); |
| 255 | |
| 256 | /* Allocate component buffers */ |
| 257 | |
| 258 | if (context->config.read_coords) { |
| 259 | struct TouchOffloadDataCoord *coord; |
| 260 | |
| 261 | frame->channel_type[chan] = TOUCH_DATA_TYPE_COORD; |
| 262 | size = TOUCH_OFFLOAD_FRAME_SIZE_COORD; |
| 263 | frame->channel_data[chan] = kzalloc(size, |
| 264 | GFP_KERNEL); |
| 265 | if (frame->channel_data[chan] == NULL) |
| 266 | goto kzalloc_channel_fail; |
| 267 | coord = (struct TouchOffloadDataCoord *) |
| 268 | frame->channel_data[chan]; |
| 269 | coord->header.channel_type = TOUCH_DATA_TYPE_COORD; |
| 270 | coord->header.channel_size = size; |
| 271 | frame->channel_data_size[chan] = size; |
| 272 | frame->header.frame_size += size; |
| 273 | chan++; |
| 274 | } |
| 275 | for (mask = 0x01; mask < 0x100; mask <<= 1) { |
| 276 | if ((context->config.mutual_data_types & mask) != 0) { |
| 277 | struct TouchOffloadData2d *data; |
| 278 | |
| 279 | frame->channel_type[chan] = |
| 280 | TOUCH_SCAN_TYPE_MUTUAL | mask; |
| 281 | size = TOUCH_OFFLOAD_FRAME_SIZE_2D( |
| 282 | context->caps.rx_size, |
| 283 | context->caps.tx_size); |
| 284 | frame->channel_data[chan] = kzalloc(size, |
| 285 | GFP_KERNEL); |
| 286 | if (frame->channel_data[chan] == NULL) |
| 287 | goto kzalloc_channel_fail; |
| 288 | data = (struct TouchOffloadData2d *) |
| 289 | frame->channel_data[chan]; |
| 290 | data->header.channel_type = |
| 291 | TOUCH_SCAN_TYPE_MUTUAL | mask; |
| 292 | data->header.channel_size = size; |
| 293 | frame->channel_data_size[chan] = size; |
| 294 | frame->header.frame_size += size; |
| 295 | chan++; |
| 296 | } |
| 297 | } |
| 298 | for (mask = 0x01; mask < 0x100; mask <<= 1) { |
| 299 | if ((context->config.self_data_types & mask) != 0) { |
| 300 | struct TouchOffloadData1d *data; |
| 301 | |
| 302 | frame->channel_type[chan] = |
| 303 | TOUCH_SCAN_TYPE_SELF | mask; |
| 304 | size = TOUCH_OFFLOAD_FRAME_SIZE_1D( |
| 305 | context->caps.rx_size, |
| 306 | context->caps.tx_size); |
| 307 | frame->channel_data[chan] = kzalloc(size, |
| 308 | GFP_KERNEL); |
| 309 | if (frame->channel_data[chan] == NULL) |
| 310 | goto kzalloc_channel_fail; |
| 311 | data = (struct TouchOffloadData1d *) |
| 312 | frame->channel_data[chan]; |
| 313 | data->header.channel_type = |
| 314 | TOUCH_SCAN_TYPE_SELF | mask; |
| 315 | data->header.channel_size = size; |
| 316 | frame->channel_data_size[chan] = size; |
| 317 | frame->header.frame_size += size; |
| 318 | chan++; |
| 319 | } |
| 320 | } |
Steve Pfetsch | df0f0a6 | 2022-01-13 19:07:27 +0000 | [diff] [blame] | 321 | for (mask = CONTEXT_CHANNEL_BIT_START; |
| 322 | mask <= CONTEXT_CHANNEL_BIT_END; |
| 323 | mask <<= 1) { |
| 324 | struct TouchOffloadChannelHeader *chan_header; |
| 325 | |
| 326 | if (!(context->config.context_channel_types & mask)) |
| 327 | continue; |
| 328 | |
| 329 | frame->channel_type[chan] = mask; |
| 330 | size = 0; |
| 331 | switch (mask) { |
| 332 | case CONTEXT_CHANNEL_TYPE_DRIVER_STATUS: |
| 333 | size = |
| 334 | TOUCH_OFFLOAD_FRAME_SIZE_DRIVER_STATUS; |
| 335 | break; |
| 336 | case CONTEXT_CHANNEL_TYPE_STYLUS_STATUS: |
| 337 | size = |
| 338 | TOUCH_OFFLOAD_FRAME_SIZE_STYLUS_STATUS; |
| 339 | break; |
| 340 | default: |
| 341 | pr_err("%s: Invalid channel_type = 0x%08X", |
| 342 | __func__, mask); |
| 343 | goto invalid_context_channel; |
| 344 | } |
| 345 | frame->channel_data[chan] = kzalloc(size, |
| 346 | GFP_KERNEL); |
| 347 | if (frame->channel_data[chan] == NULL) |
| 348 | goto kzalloc_channel_fail; |
| 349 | |
| 350 | chan_header = |
| 351 | (struct TouchOffloadChannelHeader *) |
| 352 | frame->channel_data[chan]; |
| 353 | chan_header->channel_type = mask; |
| 354 | chan_header->channel_size = size; |
| 355 | frame->channel_data_size[chan] = size; |
| 356 | frame->header.frame_size += size; |
| 357 | chan++; |
| 358 | } |
Tai Kuo | f81f4a1 | 2021-02-11 16:22:44 +0800 | [diff] [blame] | 359 | |
| 360 | frame->num_channels = chan; |
| 361 | frame->header.num_channels = chan; |
| 362 | |
| 363 | if (context->packed_frame_size == 0) |
| 364 | context->packed_frame_size = frame->header.frame_size; |
| 365 | if (context->packed_frame_size != frame->header.frame_size) |
| 366 | pr_err("%s: Frame size mismatch! %d != %d.\n", __func__, |
| 367 | context->packed_frame_size, |
| 368 | frame->header.frame_size); |
| 369 | |
| 370 | list_add_tail(&frame->entry, &context->free_pool); |
| 371 | context->num_buffers++; |
| 372 | } |
| 373 | |
| 374 | mutex_unlock(&context->buffer_lock); |
| 375 | return 0; |
| 376 | |
Steve Pfetsch | df0f0a6 | 2022-01-13 19:07:27 +0000 | [diff] [blame] | 377 | invalid_context_channel: |
Tai Kuo | f81f4a1 | 2021-02-11 16:22:44 +0800 | [diff] [blame] | 378 | kzalloc_channel_fail: |
| 379 | /* Free all channels of "frame" before returning */ |
| 380 | if (frame) |
| 381 | for (i = 0; i < MAX_CHANNELS; i++) |
| 382 | kfree(frame->channel_data[i]); |
| 383 | kfree(frame); |
| 384 | |
| 385 | mutex_unlock(&context->buffer_lock); |
| 386 | return -ENOMEM; |
| 387 | } |
| 388 | |
| 389 | static int touch_offload_free_buffers(struct touch_offload_context *context) |
| 390 | { |
| 391 | int freed = 0; |
| 392 | int chan = 0; |
| 393 | |
| 394 | pr_debug("%s\n", __func__); |
| 395 | |
| 396 | mutex_lock(&context->buffer_lock); |
| 397 | |
| 398 | /* Ensure there is no outstanding reserved_frame before continuing */ |
| 399 | while (context->reserved_frame != NULL) { |
| 400 | mutex_unlock(&context->buffer_lock); |
| 401 | wait_for_completion(&context->reserve_returned); |
| 402 | mutex_lock(&context->buffer_lock); |
| 403 | } |
| 404 | |
| 405 | if (context->num_buffers > 0) { |
| 406 | while (!list_empty(&context->free_pool)) { |
| 407 | struct list_head *next = context->free_pool.next; |
| 408 | struct touch_offload_frame *frame = |
| 409 | list_entry(next, struct touch_offload_frame, entry); |
| 410 | |
| 411 | list_del(next); |
| 412 | for (chan = 0; chan < frame->num_channels; chan++) |
| 413 | kfree(frame->channel_data[chan]); |
| 414 | kfree(frame); |
| 415 | freed++; |
| 416 | } |
| 417 | |
| 418 | while (!list_empty(&context->frame_queue)) { |
| 419 | struct list_head *next = context->frame_queue.next; |
| 420 | struct touch_offload_frame *frame = |
| 421 | list_entry(next, struct touch_offload_frame, entry); |
| 422 | |
| 423 | list_del(next); |
| 424 | for (chan = 0; chan < frame->num_channels; chan++) |
| 425 | kfree(frame->channel_data[chan]); |
| 426 | kfree(frame); |
| 427 | freed++; |
| 428 | } |
| 429 | } |
| 430 | if (freed != context->num_buffers) |
| 431 | pr_err("%s: mismatch between the number of buffers allocated(%d) and freed(%d)!", |
| 432 | __func__, context->num_buffers, freed); |
| 433 | |
| 434 | /* clean up */ |
| 435 | context->num_buffers = 0; |
| 436 | context->reserved_frame = NULL; |
| 437 | INIT_LIST_HEAD(&context->free_pool); |
| 438 | INIT_LIST_HEAD(&context->frame_queue); |
| 439 | context->packed_frame_size = 0; |
| 440 | |
| 441 | mutex_unlock(&context->buffer_lock); |
| 442 | |
| 443 | return 0; |
| 444 | } |
| 445 | |
| 446 | static long touch_offload_ioctl(struct file *file, unsigned int ioctl_num, |
| 447 | unsigned long ioctl_param) |
| 448 | { |
| 449 | struct touch_offload_context *context = file->private_data; |
| 450 | unsigned long err = 0; |
| 451 | |
| 452 | pr_debug("%s: ioctl_num=0x%08X, ioctl_param=0x%08lX\n", __func__, |
| 453 | ioctl_num, ioctl_param); |
| 454 | |
| 455 | switch (ioctl_num) { |
| 456 | case TOUCH_OFFLOAD_IOC_RD_GETCAPS: |
| 457 | { |
| 458 | struct TouchOffloadIocGetCaps getCaps; |
| 459 | |
| 460 | /* Copy previously-populated caps */ |
| 461 | memcpy(&getCaps.caps, &context->caps, |
| 462 | sizeof(context->caps)); |
| 463 | |
| 464 | err = copy_to_user((void *)ioctl_param, &getCaps, |
| 465 | sizeof(getCaps)); |
| 466 | if (err != 0) { |
| 467 | pr_err("%s: copy_to_failed with err=0x%08lX", |
| 468 | __func__, err); |
| 469 | return err; |
| 470 | } |
| 471 | break; |
| 472 | } |
| 473 | |
| 474 | case TOUCH_OFFLOAD_IOC_WR_CONFIGURE: |
| 475 | { |
| 476 | struct TouchOffloadIocConfigure configure; |
| 477 | int NUM_BUFFERS = 4; |
| 478 | int num_channels; |
| 479 | |
| 480 | err = copy_from_user(&configure, (void *)ioctl_param, |
| 481 | sizeof(configure)); |
| 482 | if (err != 0) { |
| 483 | pr_err("%s: copy_from_user failed with err=0x%08lX", |
| 484 | __func__, err); |
| 485 | return err; |
| 486 | } |
| 487 | |
| 488 | /* TODO: stop any active streaming */ |
| 489 | |
| 490 | /* Purge any previously-allocated buffers */ |
| 491 | touch_offload_free_buffers(context); |
| 492 | |
| 493 | memset(&context->config, 0, sizeof(context->config)); |
| 494 | if ((configure.config.continuous_reporting && |
| 495 | !context->caps.continuous_reporting) || |
| 496 | (configure.config.noise_reporting && |
| 497 | !context->caps.noise_reporting) || |
| 498 | (configure.config.cancel_reporting && |
| 499 | !context->caps.cancel_reporting) || |
| 500 | (configure.config.filter_grip && |
| 501 | !context->caps.filter_grip) || |
| 502 | (configure.config.filter_palm && |
Steve Pfetsch | df0f0a6 | 2022-01-13 19:07:27 +0000 | [diff] [blame] | 503 | !context->caps.filter_palm) || |
| 504 | (configure.config.auto_reporting && |
| 505 | !context->caps.auto_reporting)) { |
Tai Kuo | f81f4a1 | 2021-02-11 16:22:44 +0800 | [diff] [blame] | 506 | pr_err("%s: Invalid configuration enables unsupported features!\n", |
| 507 | __func__); |
| 508 | err = -EINVAL; |
| 509 | return err; |
| 510 | } else if (configure.config.sensitivity_setting >= |
| 511 | context->caps.num_sensitivity_settings) { |
| 512 | pr_err("%s: Invalid configuration enables unsupported sensitivity setting!\n", |
| 513 | __func__); |
| 514 | err = -EINVAL; |
| 515 | return err; |
| 516 | } else if ((configure.config.mutual_data_types & |
| 517 | ~context->caps.touch_data_types) != 0 || |
| 518 | (configure.config.self_data_types & |
| 519 | ~context->caps.touch_data_types) != 0) { |
| 520 | pr_err("%s: Invalid configuration enables unsupported data types!\n", |
| 521 | __func__); |
| 522 | err = -EINVAL; |
| 523 | return err; |
Steve Pfetsch | df0f0a6 | 2022-01-13 19:07:27 +0000 | [diff] [blame] | 524 | } else if ((configure.config.context_channel_types & |
| 525 | ~context->caps.context_channel_types) != 0) { |
| 526 | pr_err("%s: Invalid configuration enables unsupported context types!\n", |
| 527 | __func__); |
| 528 | err = -EINVAL; |
| 529 | return err; |
Tai Kuo | f81f4a1 | 2021-02-11 16:22:44 +0800 | [diff] [blame] | 530 | } |
| 531 | |
| 532 | num_channels = (configure.config.read_coords ? 1 : 0) + |
| 533 | hweight_long( |
| 534 | configure.config.mutual_data_types) + |
| 535 | hweight_long( |
Steve Pfetsch | df0f0a6 | 2022-01-13 19:07:27 +0000 | [diff] [blame] | 536 | configure.config.self_data_types) + |
| 537 | hweight_long( |
| 538 | configure.config.context_channel_types); |
Tai Kuo | f81f4a1 | 2021-02-11 16:22:44 +0800 | [diff] [blame] | 539 | if (num_channels <= 0 || num_channels > MAX_CHANNELS) { |
| 540 | pr_err("%s: Invalid configuration enables more (%d) than %d channels!\n", |
| 541 | __func__, num_channels, MAX_CHANNELS); |
| 542 | err = -EINVAL; |
| 543 | return err; |
| 544 | } |
| 545 | |
| 546 | /* Copy sanitized config */ |
| 547 | memcpy(&context->config, &configure.config, |
| 548 | sizeof(context->config)); |
| 549 | |
| 550 | /* Allocate frames */ |
| 551 | err = touch_offload_allocate_buffers(context, NUM_BUFFERS); |
| 552 | if (err != 0) { |
| 553 | pr_err("%s: failed to allocate buffers. err = 0x%08X.\n", |
| 554 | __func__, (unsigned int)err); |
| 555 | return err; |
| 556 | } |
| 557 | |
| 558 | break; |
| 559 | } |
| 560 | |
| 561 | case TOUCH_OFFLOAD_IOC_WR_REPORT: |
| 562 | { |
| 563 | struct TouchOffloadIocReport report; |
| 564 | |
| 565 | err = copy_from_user(&report, (void *)ioctl_param, |
| 566 | sizeof(report)); |
| 567 | if (err != 0) { |
| 568 | pr_err("%s: copy_from_user failed with err=0x%08lx.\n", |
| 569 | __func__, err); |
| 570 | return err; |
| 571 | } |
| 572 | |
| 573 | context->report_cb(context->hcallback, &report); |
| 574 | break; |
| 575 | } |
| 576 | |
| 577 | default: |
| 578 | return -EINVAL; |
| 579 | } |
| 580 | |
| 581 | return err; |
| 582 | } |
| 583 | |
| 584 | const struct file_operations touch_offload_fops = { |
| 585 | .owner = THIS_MODULE, |
| 586 | .open = touch_offload_open, |
| 587 | .release = touch_offload_release, |
| 588 | .read = touch_offload_read, |
| 589 | .poll = touch_offload_poll, |
| 590 | .unlocked_ioctl = touch_offload_ioctl |
| 591 | }; |
| 592 | |
| 593 | int touch_offload_reserve_frame(struct touch_offload_context *context, |
| 594 | struct touch_offload_frame **frame) |
| 595 | { |
| 596 | int ret = 0; |
| 597 | |
| 598 | pr_debug("%s\n", __func__); |
| 599 | |
| 600 | if (!context || !frame) |
| 601 | return -EINVAL; |
| 602 | *frame = NULL; |
| 603 | |
| 604 | mutex_lock(&context->buffer_lock); |
| 605 | |
| 606 | if (context->num_buffers == 0 || list_empty(&context->free_pool) || |
| 607 | context->reserved_frame != NULL) { |
| 608 | pr_debug("%s: buffer not available.\n", __func__); |
| 609 | ret = -EINVAL; |
| 610 | } else { |
| 611 | reinit_completion(&context->reserve_returned); |
| 612 | context->reserved_frame = |
| 613 | list_entry(context->free_pool.next, |
| 614 | struct touch_offload_frame, entry); |
| 615 | list_del(&context->reserved_frame->entry); |
| 616 | *frame = context->reserved_frame; |
| 617 | } |
| 618 | |
| 619 | mutex_unlock(&context->buffer_lock); |
| 620 | |
| 621 | return ret; |
| 622 | } |
| 623 | EXPORT_SYMBOL(touch_offload_reserve_frame); |
| 624 | |
| 625 | int touch_offload_queue_frame(struct touch_offload_context *context, |
| 626 | struct touch_offload_frame *frame) |
| 627 | { |
| 628 | int ret = 0; |
| 629 | |
| 630 | pr_debug("%s\n", __func__); |
| 631 | |
| 632 | if (!context || !frame) |
| 633 | return -EINVAL; |
| 634 | |
| 635 | mutex_lock(&context->buffer_lock); |
| 636 | |
| 637 | if (context->num_buffers == 0 || frame != context->reserved_frame) { |
| 638 | pr_err("%s: incorrect or NULL buffer submitted.\n", __func__); |
| 639 | ret = -EINVAL; |
| 640 | } else { |
| 641 | /* TODO: Restore important constant fields */ |
| 642 | |
| 643 | list_add_tail(&frame->entry, &context->frame_queue); |
| 644 | context->reserved_frame = NULL; |
| 645 | complete_all(&context->reserve_returned); |
| 646 | |
| 647 | wake_up(&context->read_queue); |
| 648 | } |
| 649 | |
| 650 | mutex_unlock(&context->buffer_lock); |
| 651 | |
| 652 | return ret; |
| 653 | } |
| 654 | EXPORT_SYMBOL(touch_offload_queue_frame); |
| 655 | |
| 656 | int touch_offload_init(struct touch_offload_context *context) |
| 657 | { |
| 658 | int ret = 0; |
| 659 | |
| 660 | pr_debug("%s\n", __func__); |
| 661 | |
| 662 | /* Initialize ioctl interface */ |
| 663 | context->file_in_use = false; |
| 664 | mutex_init(&context->file_lock); |
| 665 | |
| 666 | /* Initialize the buffer pool */ |
| 667 | context->num_buffers = 0; |
| 668 | context->reserved_frame = NULL; |
| 669 | INIT_LIST_HEAD(&context->free_pool); |
| 670 | INIT_LIST_HEAD(&context->frame_queue); |
| 671 | mutex_init(&context->buffer_lock); |
| 672 | |
| 673 | init_waitqueue_head(&context->read_queue); |
| 674 | |
| 675 | init_completion(&context->reserve_returned); |
| 676 | complete_all(&context->reserve_returned); |
| 677 | |
Steve Pfetsch | 5c00f54 | 2021-07-27 22:19:48 -0700 | [diff] [blame] | 678 | if (!context->multiple_panels) |
| 679 | scnprintf(context->device_name, 32, "%s", DEVICE_NAME); |
| 680 | |
Tai Kuo | f81f4a1 | 2021-02-11 16:22:44 +0800 | [diff] [blame] | 681 | /* Initialize char device */ |
Steve Pfetsch | 5c00f54 | 2021-07-27 22:19:48 -0700 | [diff] [blame] | 682 | context->major_num = register_chrdev(0, context->device_name, |
Tai Kuo | f81f4a1 | 2021-02-11 16:22:44 +0800 | [diff] [blame] | 683 | &touch_offload_fops); |
| 684 | if (context->major_num < 0) { |
| 685 | pr_err("%s: register_chrdev failed with error = %u\n", |
| 686 | __func__, context->major_num); |
| 687 | return context->major_num; |
| 688 | } |
| 689 | |
Steve Pfetsch | 5c00f54 | 2021-07-27 22:19:48 -0700 | [diff] [blame] | 690 | context->cls = class_create(THIS_MODULE, context->device_name); |
Tai Kuo | f81f4a1 | 2021-02-11 16:22:44 +0800 | [diff] [blame] | 691 | if (IS_ERR(context->cls)) { |
| 692 | pr_err("%s: class_create failed with error = %ld.\n", |
| 693 | __func__, PTR_ERR(context->cls)); |
Steve Pfetsch | 5c00f54 | 2021-07-27 22:19:48 -0700 | [diff] [blame] | 694 | unregister_chrdev(context->major_num, context->device_name); |
Tai Kuo | f81f4a1 | 2021-02-11 16:22:44 +0800 | [diff] [blame] | 695 | return PTR_ERR(context->cls); |
| 696 | } |
| 697 | |
| 698 | context->device = device_create(context->cls, NULL, |
| 699 | MKDEV(context->major_num, 0), NULL, |
Steve Pfetsch | 5c00f54 | 2021-07-27 22:19:48 -0700 | [diff] [blame] | 700 | context->device_name); |
Tai Kuo | f81f4a1 | 2021-02-11 16:22:44 +0800 | [diff] [blame] | 701 | if (IS_ERR(context->device)) { |
| 702 | pr_err("%s: device_create failed with error = %ld.\n", |
| 703 | __func__, PTR_ERR(context->device)); |
| 704 | class_destroy(context->cls); |
Steve Pfetsch | 5c00f54 | 2021-07-27 22:19:48 -0700 | [diff] [blame] | 705 | unregister_chrdev(context->major_num, context->device_name); |
Tai Kuo | f81f4a1 | 2021-02-11 16:22:44 +0800 | [diff] [blame] | 706 | return PTR_ERR(context->device); |
| 707 | } |
| 708 | |
| 709 | cdev_init(&context->dev, &touch_offload_fops); |
| 710 | cdev_add(&context->dev, MKDEV(context->major_num, 0), 1); |
| 711 | |
| 712 | return ret; |
| 713 | } |
| 714 | EXPORT_SYMBOL(touch_offload_init); |
| 715 | |
| 716 | int touch_offload_cleanup(struct touch_offload_context *context) |
| 717 | { |
| 718 | pr_debug("%s\n", __func__); |
| 719 | |
| 720 | cdev_del(&context->dev); |
| 721 | |
| 722 | device_destroy(context->cls, MKDEV(context->major_num, 0)); |
| 723 | |
| 724 | class_destroy(context->cls); |
| 725 | |
Steve Pfetsch | 5c00f54 | 2021-07-27 22:19:48 -0700 | [diff] [blame] | 726 | unregister_chrdev(context->major_num, context->device_name); |
Tai Kuo | f81f4a1 | 2021-02-11 16:22:44 +0800 | [diff] [blame] | 727 | |
davidycchen | 44b9f14 | 2022-04-21 15:15:03 +0800 | [diff] [blame] | 728 | complete_all(&context->reserve_returned); |
| 729 | |
Tai Kuo | f81f4a1 | 2021-02-11 16:22:44 +0800 | [diff] [blame] | 730 | touch_offload_free_buffers(context); |
| 731 | |
| 732 | return 0; |
| 733 | } |
| 734 | EXPORT_SYMBOL(touch_offload_cleanup); |
| 735 | |
| 736 | MODULE_DESCRIPTION("Touch Offload to AP"); |
| 737 | MODULE_AUTHOR("Steve Pfetsch <spfetsch@google.com>"); |
| 738 | MODULE_LICENSE("GPL v2"); |