Alexandra Chin | 669d27c | 2012-12-24 15:42:30 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Synaptics RMI4 touchscreen driver |
| 3 | * |
| 4 | * Copyright (C) 2012 Synaptics Incorporated |
| 5 | * |
| 6 | * Copyright (C) 2012 Alexandra Chin <alexandra.chin@tw.synaptics.com> |
| 7 | * Copyright (C) 2012 Scott Lin <scott.lin@tw.synaptics.com> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | */ |
| 19 | |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/i2c.h> |
| 24 | #include <linux/interrupt.h> |
| 25 | #include <linux/delay.h> |
| 26 | #include <linux/input.h> |
| 27 | #include <linux/gpio.h> |
| 28 | #include <linux/uaccess.h> |
| 29 | #include <linux/cdev.h> |
| 30 | #include <linux/input/synaptics_dsx.h> |
| 31 | #include "synaptics_i2c_rmi4.h" |
| 32 | |
| 33 | #define CHAR_DEVICE_NAME "rmi" |
| 34 | #define DEVICE_CLASS_NAME "rmidev" |
| 35 | #define DEV_NUMBER 1 |
| 36 | #define REG_ADDR_LIMIT 0xFFFF |
| 37 | |
| 38 | static ssize_t rmidev_sysfs_open_store(struct device *dev, |
| 39 | struct device_attribute *attr, const char *buf, size_t count); |
| 40 | |
| 41 | static ssize_t rmidev_sysfs_release_store(struct device *dev, |
| 42 | struct device_attribute *attr, const char *buf, size_t count); |
| 43 | |
| 44 | static ssize_t rmidev_sysfs_address_store(struct device *dev, |
| 45 | struct device_attribute *attr, const char *buf, size_t count); |
| 46 | |
| 47 | static ssize_t rmidev_sysfs_length_store(struct device *dev, |
| 48 | struct device_attribute *attr, const char *buf, size_t count); |
| 49 | |
| 50 | static ssize_t rmidev_sysfs_data_show(struct device *dev, |
| 51 | struct device_attribute *attr, char *buf); |
| 52 | |
| 53 | static ssize_t rmidev_sysfs_data_store(struct device *dev, |
| 54 | struct device_attribute *attr, const char *buf, size_t count); |
| 55 | |
| 56 | struct rmidev_handle { |
| 57 | dev_t dev_no; |
| 58 | unsigned short address; |
| 59 | unsigned int length; |
| 60 | struct device dev; |
| 61 | struct synaptics_rmi4_data *rmi4_data; |
| 62 | struct synaptics_rmi4_exp_fn_ptr *fn_ptr; |
| 63 | struct kobject *sysfs_dir; |
| 64 | void *data; |
| 65 | }; |
| 66 | |
| 67 | struct rmidev_data { |
| 68 | int ref_count; |
| 69 | struct cdev main_dev; |
| 70 | struct class *device_class; |
| 71 | struct mutex file_mutex; |
| 72 | struct rmidev_handle *rmi_dev; |
| 73 | }; |
| 74 | |
| 75 | static struct device_attribute attrs[] = { |
Himanshu Aggarwal | 9db4f5d | 2013-11-25 21:58:56 +0530 | [diff] [blame] | 76 | __ATTR(open, S_IWUSR | S_IWGRP, |
| 77 | NULL, |
Alexandra Chin | 669d27c | 2012-12-24 15:42:30 +0800 | [diff] [blame] | 78 | rmidev_sysfs_open_store), |
Himanshu Aggarwal | 9db4f5d | 2013-11-25 21:58:56 +0530 | [diff] [blame] | 79 | __ATTR(release, S_IWUSR | S_IWGRP, |
| 80 | NULL, |
Alexandra Chin | 669d27c | 2012-12-24 15:42:30 +0800 | [diff] [blame] | 81 | rmidev_sysfs_release_store), |
Himanshu Aggarwal | 9db4f5d | 2013-11-25 21:58:56 +0530 | [diff] [blame] | 82 | __ATTR(address, S_IWUSR | S_IWGRP, |
| 83 | NULL, |
Alexandra Chin | 669d27c | 2012-12-24 15:42:30 +0800 | [diff] [blame] | 84 | rmidev_sysfs_address_store), |
Himanshu Aggarwal | 9db4f5d | 2013-11-25 21:58:56 +0530 | [diff] [blame] | 85 | __ATTR(length, S_IWUSR | S_IWGRP, |
| 86 | NULL, |
Alexandra Chin | 669d27c | 2012-12-24 15:42:30 +0800 | [diff] [blame] | 87 | rmidev_sysfs_length_store), |
Himanshu Aggarwal | 9db4f5d | 2013-11-25 21:58:56 +0530 | [diff] [blame] | 88 | __ATTR(data, (S_IWUSR | S_IWGRP), |
Alexandra Chin | 669d27c | 2012-12-24 15:42:30 +0800 | [diff] [blame] | 89 | rmidev_sysfs_data_show, |
| 90 | rmidev_sysfs_data_store), |
| 91 | }; |
| 92 | |
| 93 | static int rmidev_major_num; |
| 94 | |
| 95 | static struct class *rmidev_device_class; |
| 96 | |
| 97 | static struct rmidev_handle *rmidev; |
| 98 | |
| 99 | static struct completion remove_complete; |
| 100 | |
| 101 | static ssize_t rmidev_sysfs_open_store(struct device *dev, |
| 102 | struct device_attribute *attr, const char *buf, size_t count) |
| 103 | { |
| 104 | unsigned int input; |
| 105 | |
| 106 | if (sscanf(buf, "%u", &input) != 1) |
| 107 | return -EINVAL; |
| 108 | |
| 109 | if (input != 1) |
| 110 | return -EINVAL; |
| 111 | |
| 112 | rmidev->fn_ptr->enable(rmidev->rmi4_data, false); |
| 113 | dev_dbg(&rmidev->rmi4_data->i2c_client->dev, |
| 114 | "%s: Attention interrupt disabled\n", |
| 115 | __func__); |
| 116 | |
| 117 | return count; |
| 118 | } |
| 119 | |
| 120 | static ssize_t rmidev_sysfs_release_store(struct device *dev, |
| 121 | struct device_attribute *attr, const char *buf, size_t count) |
| 122 | { |
| 123 | unsigned int input; |
| 124 | |
| 125 | if (sscanf(buf, "%u", &input) != 1) |
| 126 | return -EINVAL; |
| 127 | |
| 128 | if (input != 1) |
| 129 | return -EINVAL; |
| 130 | |
| 131 | rmidev->fn_ptr->enable(rmidev->rmi4_data, true); |
| 132 | dev_dbg(&rmidev->rmi4_data->i2c_client->dev, |
| 133 | "%s: Attention interrupt enabled\n", |
| 134 | __func__); |
| 135 | |
| 136 | return count; |
| 137 | } |
| 138 | |
| 139 | static ssize_t rmidev_sysfs_address_store(struct device *dev, |
| 140 | struct device_attribute *attr, const char *buf, size_t count) |
| 141 | { |
| 142 | unsigned int input; |
| 143 | |
| 144 | if (sscanf(buf, "%u", &input) != 1) |
| 145 | return -EINVAL; |
| 146 | |
| 147 | if (input > REG_ADDR_LIMIT) |
| 148 | return -EINVAL; |
| 149 | |
| 150 | rmidev->address = (unsigned short)input; |
| 151 | |
| 152 | return count; |
| 153 | } |
| 154 | |
| 155 | static ssize_t rmidev_sysfs_length_store(struct device *dev, |
| 156 | struct device_attribute *attr, const char *buf, size_t count) |
| 157 | { |
| 158 | unsigned int input; |
| 159 | |
| 160 | if (sscanf(buf, "%u", &input) != 1) |
| 161 | return -EINVAL; |
| 162 | |
| 163 | if (input > REG_ADDR_LIMIT) |
| 164 | return -EINVAL; |
| 165 | |
| 166 | rmidev->length = input; |
| 167 | |
| 168 | return count; |
| 169 | } |
| 170 | |
| 171 | static ssize_t rmidev_sysfs_data_show(struct device *dev, |
| 172 | struct device_attribute *attr, char *buf) |
| 173 | { |
| 174 | int retval; |
| 175 | unsigned int data_length = rmidev->length; |
| 176 | |
| 177 | if (data_length > (REG_ADDR_LIMIT - rmidev->address)) |
| 178 | data_length = REG_ADDR_LIMIT - rmidev->address; |
| 179 | |
| 180 | if (data_length) { |
| 181 | retval = rmidev->fn_ptr->read(rmidev->rmi4_data, |
| 182 | rmidev->address, |
| 183 | (unsigned char *)buf, |
| 184 | data_length); |
| 185 | if (retval < 0) { |
| 186 | dev_err(&rmidev->rmi4_data->i2c_client->dev, |
| 187 | "%s: Failed to read data\n", |
| 188 | __func__); |
| 189 | return retval; |
| 190 | } |
| 191 | } else { |
| 192 | return -EINVAL; |
| 193 | } |
| 194 | |
| 195 | return data_length; |
| 196 | } |
| 197 | |
| 198 | static ssize_t rmidev_sysfs_data_store(struct device *dev, |
| 199 | struct device_attribute *attr, const char *buf, size_t count) |
| 200 | { |
| 201 | int retval; |
| 202 | unsigned int data_length = rmidev->length; |
| 203 | |
| 204 | if (data_length > (REG_ADDR_LIMIT - rmidev->address)) |
| 205 | data_length = REG_ADDR_LIMIT - rmidev->address; |
| 206 | |
| 207 | if (data_length) { |
| 208 | retval = rmidev->fn_ptr->write(rmidev->rmi4_data, |
| 209 | rmidev->address, |
| 210 | (unsigned char *)buf, |
| 211 | data_length); |
| 212 | if (retval < 0) { |
| 213 | dev_err(&rmidev->rmi4_data->i2c_client->dev, |
| 214 | "%s: Failed to write data\n", |
| 215 | __func__); |
| 216 | return retval; |
| 217 | } |
| 218 | } else { |
| 219 | return -EINVAL; |
| 220 | } |
| 221 | |
| 222 | return data_length; |
| 223 | } |
| 224 | |
| 225 | /* |
| 226 | * rmidev_llseek - used to set up register address |
| 227 | * |
| 228 | * @filp: file structure for seek |
| 229 | * @off: offset |
| 230 | * if whence == SEEK_SET, |
| 231 | * high 16 bits: page address |
| 232 | * low 16 bits: register address |
| 233 | * if whence == SEEK_CUR, |
| 234 | * offset from current position |
| 235 | * if whence == SEEK_END, |
| 236 | * offset from end position (0xFFFF) |
| 237 | * @whence: SEEK_SET, SEEK_CUR, or SEEK_END |
| 238 | */ |
| 239 | static loff_t rmidev_llseek(struct file *filp, loff_t off, int whence) |
| 240 | { |
| 241 | loff_t newpos; |
| 242 | struct rmidev_data *dev_data = filp->private_data; |
| 243 | |
| 244 | if (IS_ERR(dev_data)) { |
| 245 | pr_err("%s: Pointer of char device data is invalid", __func__); |
| 246 | return -EBADF; |
| 247 | } |
| 248 | |
| 249 | mutex_lock(&(dev_data->file_mutex)); |
| 250 | |
| 251 | switch (whence) { |
| 252 | case SEEK_SET: |
| 253 | newpos = off; |
| 254 | break; |
| 255 | case SEEK_CUR: |
| 256 | newpos = filp->f_pos + off; |
| 257 | break; |
| 258 | case SEEK_END: |
| 259 | newpos = REG_ADDR_LIMIT + off; |
| 260 | break; |
| 261 | default: |
| 262 | newpos = -EINVAL; |
| 263 | goto clean_up; |
| 264 | } |
| 265 | |
| 266 | if (newpos < 0 || newpos > REG_ADDR_LIMIT) { |
| 267 | dev_err(&rmidev->rmi4_data->i2c_client->dev, |
| 268 | "%s: New position 0x%04x is invalid\n", |
| 269 | __func__, (unsigned int)newpos); |
| 270 | newpos = -EINVAL; |
| 271 | goto clean_up; |
| 272 | } |
| 273 | |
| 274 | filp->f_pos = newpos; |
| 275 | |
| 276 | clean_up: |
| 277 | mutex_unlock(&(dev_data->file_mutex)); |
| 278 | |
| 279 | return newpos; |
| 280 | } |
| 281 | |
| 282 | /* |
| 283 | * rmidev_read: - use to read data from rmi device |
| 284 | * |
| 285 | * @filp: file structure for read |
| 286 | * @buf: user space buffer pointer |
| 287 | * @count: number of bytes to read |
| 288 | * @f_pos: offset (starting register address) |
| 289 | */ |
| 290 | static ssize_t rmidev_read(struct file *filp, char __user *buf, |
| 291 | size_t count, loff_t *f_pos) |
| 292 | { |
| 293 | ssize_t retval; |
| 294 | unsigned char tmpbuf[count + 1]; |
| 295 | struct rmidev_data *dev_data = filp->private_data; |
| 296 | |
| 297 | if (IS_ERR(dev_data)) { |
| 298 | pr_err("%s: Pointer of char device data is invalid", __func__); |
| 299 | return -EBADF; |
| 300 | } |
| 301 | |
| 302 | if (count == 0) |
| 303 | return 0; |
| 304 | |
| 305 | if (count > (REG_ADDR_LIMIT - *f_pos)) |
| 306 | count = REG_ADDR_LIMIT - *f_pos; |
| 307 | |
| 308 | mutex_lock(&(dev_data->file_mutex)); |
| 309 | |
| 310 | retval = rmidev->fn_ptr->read(rmidev->rmi4_data, |
| 311 | *f_pos, |
| 312 | tmpbuf, |
| 313 | count); |
| 314 | if (retval < 0) |
| 315 | goto clean_up; |
| 316 | |
| 317 | if (copy_to_user(buf, tmpbuf, count)) |
| 318 | retval = -EFAULT; |
| 319 | else |
| 320 | *f_pos += retval; |
| 321 | |
| 322 | clean_up: |
| 323 | mutex_unlock(&(dev_data->file_mutex)); |
| 324 | |
| 325 | return retval; |
| 326 | } |
| 327 | |
| 328 | /* |
| 329 | * rmidev_write: - used to write data to rmi device |
| 330 | * |
| 331 | * @filep: file structure for write |
| 332 | * @buf: user space buffer pointer |
| 333 | * @count: number of bytes to write |
| 334 | * @f_pos: offset (starting register address) |
| 335 | */ |
| 336 | static ssize_t rmidev_write(struct file *filp, const char __user *buf, |
| 337 | size_t count, loff_t *f_pos) |
| 338 | { |
| 339 | ssize_t retval; |
| 340 | unsigned char tmpbuf[count + 1]; |
| 341 | struct rmidev_data *dev_data = filp->private_data; |
| 342 | |
| 343 | if (IS_ERR(dev_data)) { |
| 344 | pr_err("%s: Pointer of char device data is invalid", __func__); |
| 345 | return -EBADF; |
| 346 | } |
| 347 | |
| 348 | if (count == 0) |
| 349 | return 0; |
| 350 | |
| 351 | if (count > (REG_ADDR_LIMIT - *f_pos)) |
| 352 | count = REG_ADDR_LIMIT - *f_pos; |
| 353 | |
| 354 | if (copy_from_user(tmpbuf, buf, count)) |
| 355 | return -EFAULT; |
| 356 | |
| 357 | mutex_lock(&(dev_data->file_mutex)); |
| 358 | |
| 359 | retval = rmidev->fn_ptr->write(rmidev->rmi4_data, |
| 360 | *f_pos, |
| 361 | tmpbuf, |
| 362 | count); |
| 363 | if (retval >= 0) |
| 364 | *f_pos += retval; |
| 365 | |
| 366 | mutex_unlock(&(dev_data->file_mutex)); |
| 367 | |
| 368 | return retval; |
| 369 | } |
| 370 | |
| 371 | /* |
| 372 | * rmidev_open: enable access to rmi device |
| 373 | * @inp: inode struture |
| 374 | * @filp: file structure |
| 375 | */ |
| 376 | static int rmidev_open(struct inode *inp, struct file *filp) |
| 377 | { |
| 378 | int retval = 0; |
| 379 | struct rmidev_data *dev_data = |
| 380 | container_of(inp->i_cdev, struct rmidev_data, main_dev); |
| 381 | |
| 382 | if (!dev_data) |
| 383 | return -EACCES; |
| 384 | |
| 385 | filp->private_data = dev_data; |
| 386 | |
| 387 | mutex_lock(&(dev_data->file_mutex)); |
| 388 | |
| 389 | rmidev->fn_ptr->enable(rmidev->rmi4_data, false); |
| 390 | dev_dbg(&rmidev->rmi4_data->i2c_client->dev, |
| 391 | "%s: Attention interrupt disabled\n", |
| 392 | __func__); |
| 393 | |
| 394 | if (dev_data->ref_count < 1) |
| 395 | dev_data->ref_count++; |
| 396 | else |
| 397 | retval = -EACCES; |
| 398 | |
| 399 | mutex_unlock(&(dev_data->file_mutex)); |
| 400 | |
| 401 | return retval; |
| 402 | } |
| 403 | |
| 404 | /* |
| 405 | * rmidev_release: - release access to rmi device |
| 406 | * @inp: inode structure |
| 407 | * @filp: file structure |
| 408 | */ |
| 409 | static int rmidev_release(struct inode *inp, struct file *filp) |
| 410 | { |
| 411 | struct rmidev_data *dev_data = |
| 412 | container_of(inp->i_cdev, struct rmidev_data, main_dev); |
| 413 | |
| 414 | if (!dev_data) |
| 415 | return -EACCES; |
| 416 | |
| 417 | mutex_lock(&(dev_data->file_mutex)); |
| 418 | |
| 419 | dev_data->ref_count--; |
| 420 | if (dev_data->ref_count < 0) |
| 421 | dev_data->ref_count = 0; |
| 422 | |
| 423 | rmidev->fn_ptr->enable(rmidev->rmi4_data, true); |
| 424 | dev_dbg(&rmidev->rmi4_data->i2c_client->dev, |
| 425 | "%s: Attention interrupt enabled\n", |
| 426 | __func__); |
| 427 | |
| 428 | mutex_unlock(&(dev_data->file_mutex)); |
| 429 | |
| 430 | return 0; |
| 431 | } |
| 432 | |
| 433 | static const struct file_operations rmidev_fops = { |
| 434 | .owner = THIS_MODULE, |
| 435 | .llseek = rmidev_llseek, |
| 436 | .read = rmidev_read, |
| 437 | .write = rmidev_write, |
| 438 | .open = rmidev_open, |
| 439 | .release = rmidev_release, |
| 440 | }; |
| 441 | |
| 442 | static void rmidev_device_cleanup(struct rmidev_data *dev_data) |
| 443 | { |
| 444 | dev_t devno; |
| 445 | |
| 446 | if (dev_data) { |
| 447 | devno = dev_data->main_dev.dev; |
| 448 | |
| 449 | if (dev_data->device_class) |
| 450 | device_destroy(dev_data->device_class, devno); |
| 451 | |
| 452 | cdev_del(&dev_data->main_dev); |
| 453 | |
| 454 | unregister_chrdev_region(devno, 1); |
| 455 | |
| 456 | dev_dbg(&rmidev->rmi4_data->i2c_client->dev, |
| 457 | "%s: rmidev device removed\n", |
| 458 | __func__); |
| 459 | } |
| 460 | |
| 461 | return; |
| 462 | } |
| 463 | |
| 464 | static char *rmi_char_devnode(struct device *dev, mode_t *mode) |
| 465 | { |
| 466 | if (!mode) |
| 467 | return NULL; |
| 468 | |
| 469 | *mode = (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
| 470 | |
| 471 | return kasprintf(GFP_KERNEL, "rmi/%s", dev_name(dev)); |
| 472 | } |
| 473 | |
| 474 | static int rmidev_create_device_class(void) |
| 475 | { |
| 476 | rmidev_device_class = class_create(THIS_MODULE, DEVICE_CLASS_NAME); |
| 477 | |
| 478 | if (IS_ERR(rmidev_device_class)) { |
| 479 | pr_err("%s: Failed to create /dev/%s\n", |
| 480 | __func__, CHAR_DEVICE_NAME); |
| 481 | return -ENODEV; |
| 482 | } |
| 483 | |
| 484 | rmidev_device_class->devnode = rmi_char_devnode; |
| 485 | |
| 486 | return 0; |
| 487 | } |
| 488 | |
| 489 | static int rmidev_init_device(struct synaptics_rmi4_data *rmi4_data) |
| 490 | { |
| 491 | int retval; |
| 492 | dev_t dev_no; |
| 493 | unsigned char attr_count; |
| 494 | struct rmidev_data *dev_data; |
| 495 | struct device *device_ptr; |
| 496 | |
| 497 | rmidev = kzalloc(sizeof(*rmidev), GFP_KERNEL); |
| 498 | if (!rmidev) { |
| 499 | dev_err(&rmi4_data->i2c_client->dev, |
| 500 | "%s: Failed to alloc mem for rmidev\n", |
| 501 | __func__); |
| 502 | retval = -ENOMEM; |
| 503 | goto err_rmidev; |
| 504 | } |
| 505 | |
| 506 | rmidev->fn_ptr = kzalloc(sizeof(*(rmidev->fn_ptr)), GFP_KERNEL); |
| 507 | if (!rmidev) { |
| 508 | dev_err(&rmi4_data->i2c_client->dev, |
| 509 | "%s: Failed to alloc mem for fn_ptr\n", |
| 510 | __func__); |
| 511 | retval = -ENOMEM; |
| 512 | goto err_fn_ptr; |
| 513 | } |
| 514 | |
| 515 | rmidev->fn_ptr->read = rmi4_data->i2c_read; |
| 516 | rmidev->fn_ptr->write = rmi4_data->i2c_write; |
| 517 | rmidev->fn_ptr->enable = rmi4_data->irq_enable; |
| 518 | rmidev->rmi4_data = rmi4_data; |
| 519 | |
| 520 | retval = rmidev_create_device_class(); |
| 521 | if (retval < 0) { |
| 522 | dev_err(&rmi4_data->i2c_client->dev, |
| 523 | "%s: Failed to create device class\n", |
| 524 | __func__); |
| 525 | goto err_device_class; |
| 526 | } |
| 527 | |
| 528 | if (rmidev_major_num) { |
| 529 | dev_no = MKDEV(rmidev_major_num, DEV_NUMBER); |
| 530 | retval = register_chrdev_region(dev_no, 1, CHAR_DEVICE_NAME); |
| 531 | } else { |
| 532 | retval = alloc_chrdev_region(&dev_no, 0, 1, CHAR_DEVICE_NAME); |
| 533 | if (retval < 0) { |
| 534 | dev_err(&rmi4_data->i2c_client->dev, |
| 535 | "%s: Failed to allocate char device region\n", |
| 536 | __func__); |
| 537 | goto err_device_region; |
| 538 | } |
| 539 | |
| 540 | rmidev_major_num = MAJOR(dev_no); |
| 541 | dev_dbg(&rmi4_data->i2c_client->dev, |
| 542 | "%s: Major number of rmidev = %d\n", |
| 543 | __func__, rmidev_major_num); |
| 544 | } |
| 545 | |
| 546 | dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL); |
| 547 | if (!dev_data) { |
| 548 | dev_err(&rmi4_data->i2c_client->dev, |
| 549 | "%s: Failed to alloc mem for dev_data\n", |
| 550 | __func__); |
| 551 | retval = -ENOMEM; |
| 552 | goto err_dev_data; |
| 553 | } |
| 554 | |
| 555 | mutex_init(&dev_data->file_mutex); |
| 556 | dev_data->rmi_dev = rmidev; |
| 557 | rmidev->data = dev_data; |
| 558 | |
| 559 | cdev_init(&dev_data->main_dev, &rmidev_fops); |
| 560 | |
| 561 | retval = cdev_add(&dev_data->main_dev, dev_no, 1); |
| 562 | if (retval < 0) { |
| 563 | dev_err(&rmi4_data->i2c_client->dev, |
| 564 | "%s: Failed to add rmi char device\n", |
| 565 | __func__); |
| 566 | goto err_char_device; |
| 567 | } |
| 568 | |
| 569 | dev_set_name(&rmidev->dev, "rmidev%d", MINOR(dev_no)); |
| 570 | dev_data->device_class = rmidev_device_class; |
| 571 | |
| 572 | device_ptr = device_create(dev_data->device_class, NULL, dev_no, |
| 573 | NULL, CHAR_DEVICE_NAME"%d", MINOR(dev_no)); |
| 574 | if (IS_ERR(device_ptr)) { |
| 575 | dev_err(&rmi4_data->i2c_client->dev, |
| 576 | "%s: Failed to create rmi char device\n", |
| 577 | __func__); |
| 578 | retval = -ENODEV; |
| 579 | goto err_char_device; |
| 580 | } |
| 581 | |
| 582 | retval = gpio_export(rmi4_data->board->irq_gpio, false); |
| 583 | if (retval < 0) { |
| 584 | dev_err(&rmi4_data->i2c_client->dev, |
| 585 | "%s: Failed to export attention gpio\n", |
| 586 | __func__); |
| 587 | } else { |
| 588 | retval = gpio_export_link(&(rmi4_data->input_dev->dev), |
| 589 | "attn", rmi4_data->board->irq_gpio); |
| 590 | if (retval < 0) { |
| 591 | dev_err(&rmi4_data->input_dev->dev, |
| 592 | "%s Failed to create gpio symlink\n", |
| 593 | __func__); |
| 594 | } else { |
| 595 | dev_dbg(&rmi4_data->input_dev->dev, |
| 596 | "%s: Exported attention gpio %d\n", |
| 597 | __func__, rmi4_data->board->irq_gpio); |
| 598 | } |
| 599 | } |
| 600 | |
| 601 | rmidev->sysfs_dir = kobject_create_and_add("rmidev", |
| 602 | &rmi4_data->input_dev->dev.kobj); |
| 603 | if (!rmidev->sysfs_dir) { |
| 604 | dev_err(&rmi4_data->i2c_client->dev, |
| 605 | "%s: Failed to create sysfs directory\n", |
| 606 | __func__); |
| 607 | goto err_sysfs_dir; |
| 608 | } |
| 609 | |
| 610 | for (attr_count = 0; attr_count < ARRAY_SIZE(attrs); attr_count++) { |
| 611 | retval = sysfs_create_file(rmidev->sysfs_dir, |
| 612 | &attrs[attr_count].attr); |
| 613 | if (retval < 0) { |
| 614 | dev_err(&rmi4_data->input_dev->dev, |
| 615 | "%s: Failed to create sysfs attributes\n", |
| 616 | __func__); |
| 617 | retval = -ENODEV; |
| 618 | goto err_sysfs_attrs; |
| 619 | } |
| 620 | } |
| 621 | |
Alexandra Chin | c556cf0 | 2013-03-19 17:46:05 -0700 | [diff] [blame] | 622 | init_completion(&remove_complete); |
| 623 | |
Alexandra Chin | 669d27c | 2012-12-24 15:42:30 +0800 | [diff] [blame] | 624 | return 0; |
| 625 | |
| 626 | err_sysfs_attrs: |
| 627 | for (attr_count--; attr_count >= 0; attr_count--) { |
| 628 | sysfs_remove_file(&rmi4_data->input_dev->dev.kobj, |
| 629 | &attrs[attr_count].attr); |
| 630 | } |
| 631 | |
| 632 | kobject_put(rmidev->sysfs_dir); |
| 633 | |
| 634 | err_sysfs_dir: |
| 635 | err_char_device: |
| 636 | rmidev_device_cleanup(dev_data); |
| 637 | kfree(dev_data); |
| 638 | |
| 639 | err_dev_data: |
| 640 | unregister_chrdev_region(dev_no, 1); |
| 641 | |
| 642 | err_device_region: |
| 643 | class_destroy(rmidev_device_class); |
| 644 | |
| 645 | err_device_class: |
| 646 | kfree(rmidev->fn_ptr); |
| 647 | |
| 648 | err_fn_ptr: |
| 649 | kfree(rmidev); |
| 650 | |
| 651 | err_rmidev: |
| 652 | return retval; |
| 653 | } |
| 654 | |
| 655 | static void rmidev_remove_device(struct synaptics_rmi4_data *rmi4_data) |
| 656 | { |
| 657 | unsigned char attr_count; |
| 658 | struct rmidev_data *dev_data; |
| 659 | |
| 660 | if (!rmidev) |
| 661 | return; |
| 662 | |
| 663 | for (attr_count = 0; attr_count < ARRAY_SIZE(attrs); attr_count++) |
| 664 | sysfs_remove_file(rmidev->sysfs_dir, &attrs[attr_count].attr); |
| 665 | |
| 666 | kobject_put(rmidev->sysfs_dir); |
| 667 | |
| 668 | dev_data = rmidev->data; |
| 669 | if (dev_data) { |
| 670 | rmidev_device_cleanup(dev_data); |
| 671 | kfree(dev_data); |
| 672 | } |
| 673 | |
| 674 | unregister_chrdev_region(rmidev->dev_no, 1); |
| 675 | |
| 676 | class_destroy(rmidev_device_class); |
| 677 | |
| 678 | kfree(rmidev->fn_ptr); |
| 679 | kfree(rmidev); |
| 680 | |
| 681 | complete(&remove_complete); |
| 682 | |
| 683 | return; |
| 684 | } |
| 685 | |
| 686 | static int __init rmidev_module_init(void) |
| 687 | { |
| 688 | synaptics_rmi4_new_function(RMI_DEV, true, |
| 689 | rmidev_init_device, |
| 690 | rmidev_remove_device, |
| 691 | NULL); |
| 692 | return 0; |
| 693 | } |
| 694 | |
| 695 | static void __exit rmidev_module_exit(void) |
| 696 | { |
| 697 | init_completion(&remove_complete); |
| 698 | synaptics_rmi4_new_function(RMI_DEV, false, |
| 699 | rmidev_init_device, |
| 700 | rmidev_remove_device, |
| 701 | NULL); |
| 702 | wait_for_completion(&remove_complete); |
| 703 | return; |
| 704 | } |
| 705 | |
| 706 | module_init(rmidev_module_init); |
| 707 | module_exit(rmidev_module_exit); |
| 708 | |
| 709 | MODULE_AUTHOR("Synaptics, Inc."); |
| 710 | MODULE_DESCRIPTION("RMI4 RMI_Dev Module"); |
Alexandra Chin | bd1dac2 | 2013-02-22 12:33:19 -0800 | [diff] [blame] | 711 | MODULE_LICENSE("GPL v2"); |