Abir Ghosh | 989d5e9 | 2016-10-09 11:47:28 +0300 | [diff] [blame] | 1 | /* Copyright (c) 2016-2017, The Linux Foundation. All rights reserved. |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | #define DEBUG |
| 13 | #define pr_fmt(fmt) "qbt1000:%s: " fmt, __func__ |
| 14 | |
| 15 | #include <linux/delay.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/fs.h> |
| 19 | #include <linux/uaccess.h> |
| 20 | #include <linux/platform_device.h> |
| 21 | #include <linux/debugfs.h> |
| 22 | #include <linux/types.h> |
| 23 | #include <linux/cdev.h> |
| 24 | #include <linux/clk.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/interrupt.h> |
| 27 | #include <linux/workqueue.h> |
| 28 | #include <linux/pm.h> |
| 29 | #include <linux/of.h> |
| 30 | #include <linux/mutex.h> |
| 31 | #include <linux/atomic.h> |
| 32 | #include <linux/of.h> |
| 33 | #include <linux/of_gpio.h> |
| 34 | #include <linux/input.h> |
| 35 | #include <linux/kfifo.h> |
| 36 | #include <linux/poll.h> |
| 37 | #include <uapi/linux/qbt1000.h> |
| 38 | #include <soc/qcom/scm.h> |
| 39 | #include "../../misc/qseecom_kernel.h" |
| 40 | |
| 41 | #define QBT1000_DEV "qbt1000" |
| 42 | #define QBT1000_IN_DEV_NAME "qbt1000_key_input" |
| 43 | #define QBT1000_IN_DEV_VERSION 0x0100 |
| 44 | #define MAX_FW_EVENTS 128 |
| 45 | #define FP_APP_CMD_RX_IPC 132 |
| 46 | #define FW_MAX_IPC_MSG_DATA_SIZE 0x500 |
| 47 | #define IPC_MSG_ID_CBGE_REQUIRED 29 |
| 48 | |
| 49 | /* |
| 50 | * shared buffer size - init with max value, |
| 51 | * user space will provide new value upon tz app load |
| 52 | */ |
| 53 | static uint32_t g_app_buf_size = SZ_256K; |
| 54 | static char const *const FP_APP_NAME = "fingerpr"; |
| 55 | |
| 56 | struct finger_detect_gpio { |
| 57 | int gpio; |
| 58 | int active_low; |
| 59 | int irq; |
| 60 | struct work_struct work; |
| 61 | unsigned int key_code; |
| 62 | int power_key_enabled; |
| 63 | int last_gpio_state; |
| 64 | int event_reported; |
| 65 | }; |
| 66 | |
| 67 | struct fw_event_desc { |
| 68 | enum qbt1000_fw_event ev; |
| 69 | }; |
| 70 | |
| 71 | struct fw_ipc_info { |
| 72 | int gpio; |
| 73 | int irq; |
| 74 | }; |
| 75 | |
| 76 | struct qbt1000_drvdata { |
| 77 | struct class *qbt1000_class; |
| 78 | struct cdev qbt1000_cdev; |
| 79 | struct device *dev; |
| 80 | char *qbt1000_node; |
| 81 | struct clk **clocks; |
| 82 | unsigned int clock_count; |
| 83 | uint8_t clock_state; |
| 84 | unsigned int root_clk_idx; |
| 85 | unsigned int frequency; |
| 86 | atomic_t available; |
| 87 | struct mutex mutex; |
| 88 | struct mutex fw_events_mutex; |
| 89 | struct input_dev *in_dev; |
| 90 | struct fw_ipc_info fw_ipc; |
| 91 | struct finger_detect_gpio fd_gpio; |
| 92 | DECLARE_KFIFO(fw_events, struct fw_event_desc, MAX_FW_EVENTS); |
| 93 | wait_queue_head_t read_wait_queue; |
| 94 | struct qseecom_handle *app_handle; |
| 95 | struct qseecom_handle *fp_app_handle; |
| 96 | }; |
| 97 | |
| 98 | /* |
| 99 | * struct fw_ipc_cmd - |
| 100 | * used to store IPC commands to/from firmware |
| 101 | * @status - indicates whether sending/getting the IPC message was successful |
| 102 | * @msg_type - the type of IPC message |
| 103 | * @msg_len - the length of the message data |
| 104 | * @resp_needed - whether a response is needed for this message |
| 105 | * @msg_data - any extra data associated with the message |
| 106 | */ |
| 107 | struct fw_ipc_cmd { |
| 108 | uint32_t status; |
| 109 | uint32_t numMsgs; |
| 110 | uint8_t msg_data[FW_MAX_IPC_MSG_DATA_SIZE]; |
| 111 | }; |
| 112 | |
| 113 | struct fw_ipc_header { |
| 114 | uint32_t msg_type; |
| 115 | uint32_t msg_len; |
| 116 | uint32_t resp_needed; |
| 117 | }; |
| 118 | |
| 119 | /* |
| 120 | * struct ipc_msg_type_to_fw_event - |
| 121 | * entry in mapping between an IPC message type to a firmware event |
| 122 | * @msg_type - IPC message type, as reported by firmware |
| 123 | * @fw_event - corresponding firmware event code to report to driver client |
| 124 | */ |
| 125 | struct ipc_msg_type_to_fw_event { |
| 126 | uint32_t msg_type; |
| 127 | enum qbt1000_fw_event fw_event; |
| 128 | }; |
| 129 | |
| 130 | /* mapping between firmware IPC message types to HLOS firmware events */ |
| 131 | struct ipc_msg_type_to_fw_event g_msg_to_event[] = { |
| 132 | {IPC_MSG_ID_CBGE_REQUIRED, FW_EVENT_CBGE_REQUIRED} |
| 133 | }; |
| 134 | |
| 135 | /** |
| 136 | * get_cmd_rsp_buffers() - Function sets cmd & rsp buffer pointers and |
| 137 | * aligns buffer lengths |
| 138 | * @hdl: index of qseecom_handle |
| 139 | * @cmd: req buffer - set to qseecom_handle.sbuf |
| 140 | * @cmd_len: ptr to req buffer len |
| 141 | * @rsp: rsp buffer - set to qseecom_handle.sbuf + offset |
| 142 | * @rsp_len: ptr to rsp buffer len |
| 143 | * |
| 144 | * Return: 0 on success. Error code on failure. |
| 145 | */ |
| 146 | static int get_cmd_rsp_buffers(struct qseecom_handle *hdl, |
| 147 | void **cmd, |
| 148 | uint32_t *cmd_len, |
| 149 | void **rsp, |
| 150 | uint32_t *rsp_len) |
| 151 | { |
| 152 | /* 64 bytes alignment for QSEECOM */ |
Abir Ghosh | 236b0dc | 2017-05-12 09:16:34 +0530 | [diff] [blame] | 153 | uint64_t aligned_cmd_len = ALIGN((uint64_t)*cmd_len, 64); |
| 154 | uint64_t aligned_rsp_len = ALIGN((uint64_t)*rsp_len, 64); |
Abir Ghosh | 989d5e9 | 2016-10-09 11:47:28 +0300 | [diff] [blame] | 155 | |
Abir Ghosh | 236b0dc | 2017-05-12 09:16:34 +0530 | [diff] [blame] | 156 | if ((aligned_rsp_len + aligned_cmd_len) > (uint64_t)g_app_buf_size) |
Abir Ghosh | 989d5e9 | 2016-10-09 11:47:28 +0300 | [diff] [blame] | 157 | return -ENOMEM; |
Abir Ghosh | 989d5e9 | 2016-10-09 11:47:28 +0300 | [diff] [blame] | 158 | |
| 159 | *cmd = hdl->sbuf; |
Abir Ghosh | 236b0dc | 2017-05-12 09:16:34 +0530 | [diff] [blame] | 160 | *cmd_len = aligned_cmd_len; |
Abir Ghosh | 989d5e9 | 2016-10-09 11:47:28 +0300 | [diff] [blame] | 161 | *rsp = hdl->sbuf + *cmd_len; |
Abir Ghosh | 236b0dc | 2017-05-12 09:16:34 +0530 | [diff] [blame] | 162 | *rsp_len = aligned_rsp_len; |
| 163 | |
Abir Ghosh | 989d5e9 | 2016-10-09 11:47:28 +0300 | [diff] [blame] | 164 | return 0; |
| 165 | } |
| 166 | |
| 167 | /** |
| 168 | * send_tz_cmd() - Function sends a command to TZ |
| 169 | * |
| 170 | * @drvdata: pointer to driver data |
| 171 | * @app_handle: handle to tz app |
| 172 | * @is_user_space: 1 if the cmd buffer is in user space, 0 |
| 173 | * otherwise |
| 174 | * @cmd: command buffer to send |
| 175 | * @cmd_len: length of the command buffer |
| 176 | * @rsp: output, will be set to location of response buffer |
| 177 | * @rsp_len: max size of response |
| 178 | * |
| 179 | * Return: 0 on success. |
| 180 | */ |
| 181 | static int send_tz_cmd(struct qbt1000_drvdata *drvdata, |
| 182 | struct qseecom_handle *app_handle, |
| 183 | int is_user_space, |
| 184 | void *cmd, uint32_t cmd_len, |
| 185 | void **rsp, uint32_t rsp_len) |
| 186 | { |
| 187 | int rc = 0; |
| 188 | void *aligned_cmd; |
| 189 | void *aligned_rsp; |
| 190 | uint32_t aligned_cmd_len; |
| 191 | uint32_t aligned_rsp_len; |
| 192 | |
| 193 | /* init command and response buffers and align lengths */ |
| 194 | aligned_cmd_len = cmd_len; |
| 195 | aligned_rsp_len = rsp_len; |
| 196 | |
| 197 | rc = get_cmd_rsp_buffers(app_handle, |
| 198 | (void **)&aligned_cmd, |
| 199 | &aligned_cmd_len, |
| 200 | (void **)&aligned_rsp, |
| 201 | &aligned_rsp_len); |
| 202 | |
| 203 | if (rc != 0) |
| 204 | goto end; |
| 205 | |
| 206 | if (!aligned_cmd) { |
| 207 | dev_err(drvdata->dev, "%s: Null command buffer\n", |
| 208 | __func__); |
| 209 | rc = -EINVAL; |
| 210 | goto end; |
| 211 | } |
| 212 | |
| 213 | if (aligned_cmd - cmd + cmd_len > g_app_buf_size) { |
| 214 | rc = -ENOMEM; |
| 215 | goto end; |
| 216 | } |
| 217 | |
| 218 | if (is_user_space) { |
| 219 | rc = copy_from_user(aligned_cmd, (void __user *)cmd, |
| 220 | cmd_len); |
| 221 | if (rc != 0) { |
| 222 | pr_err("failure to copy user space buf %d\n", rc); |
| 223 | rc = -EFAULT; |
| 224 | goto end; |
| 225 | } |
| 226 | } else |
| 227 | memcpy(aligned_cmd, cmd, cmd_len); |
| 228 | |
| 229 | /* send cmd to TZ */ |
| 230 | rc = qseecom_send_command(app_handle, |
| 231 | aligned_cmd, |
| 232 | aligned_cmd_len, |
| 233 | aligned_rsp, |
| 234 | aligned_rsp_len); |
| 235 | |
| 236 | if (rc != 0) { |
| 237 | pr_err("failure to send tz cmd %d\n", rc); |
| 238 | goto end; |
| 239 | } |
| 240 | |
| 241 | *rsp = aligned_rsp; |
| 242 | |
| 243 | end: |
| 244 | return rc; |
| 245 | } |
| 246 | |
| 247 | /** |
| 248 | * qbt1000_open() - Function called when user space opens device. |
| 249 | * Successful if driver not currently open. |
| 250 | * @inode: ptr to inode object |
| 251 | * @file: ptr to file object |
| 252 | * |
| 253 | * Return: 0 on success. Error code on failure. |
| 254 | */ |
| 255 | static int qbt1000_open(struct inode *inode, struct file *file) |
| 256 | { |
| 257 | int rc = 0; |
| 258 | |
| 259 | struct qbt1000_drvdata *drvdata = container_of(inode->i_cdev, |
| 260 | struct qbt1000_drvdata, |
| 261 | qbt1000_cdev); |
| 262 | file->private_data = drvdata; |
| 263 | |
| 264 | pr_debug("qbt1000_open begin\n"); |
| 265 | /* disallowing concurrent opens */ |
| 266 | if (!atomic_dec_and_test(&drvdata->available)) { |
| 267 | atomic_inc(&drvdata->available); |
| 268 | rc = -EBUSY; |
| 269 | } |
| 270 | |
| 271 | pr_debug("qbt1000_open end : %d\n", rc); |
| 272 | return rc; |
| 273 | } |
| 274 | |
| 275 | /** |
| 276 | * qbt1000_release() - Function called when user space closes device. |
| 277 | |
| 278 | * @inode: ptr to inode object |
| 279 | * @file: ptr to file object |
| 280 | * |
| 281 | * Return: 0 on success. Error code on failure. |
| 282 | */ |
| 283 | static int qbt1000_release(struct inode *inode, struct file *file) |
| 284 | { |
| 285 | struct qbt1000_drvdata *drvdata; |
| 286 | |
| 287 | if (!file || !file->private_data) { |
| 288 | pr_err("qbt1000_release: NULL pointer passed"); |
| 289 | return -EINVAL; |
| 290 | } |
| 291 | drvdata = file->private_data; |
| 292 | atomic_inc(&drvdata->available); |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | /** |
| 297 | * qbt1000_ioctl() - Function called when user space calls ioctl. |
| 298 | * @file: struct file - not used |
| 299 | * @cmd: cmd identifier:QBT1000_LOAD_APP,QBT1000_UNLOAD_APP, |
| 300 | * QBT1000_SEND_TZCMD |
| 301 | * @arg: ptr to relevant structe: either qbt1000_app or |
| 302 | * qbt1000_send_tz_cmd depending on which cmd is passed |
| 303 | * |
| 304 | * Return: 0 on success. Error code on failure. |
| 305 | */ |
| 306 | static long qbt1000_ioctl( |
| 307 | struct file *file, unsigned int cmd, unsigned long arg) |
| 308 | { |
| 309 | int rc = 0; |
| 310 | void __user *priv_arg = (void __user *)arg; |
| 311 | struct qbt1000_drvdata *drvdata; |
| 312 | |
| 313 | if (!file || !file->private_data) { |
| 314 | pr_err("qbt1000_ioctl: NULL pointer passed"); |
| 315 | return -EINVAL; |
| 316 | } |
| 317 | |
| 318 | drvdata = file->private_data; |
| 319 | |
Abir Ghosh | c59c26c | 2017-04-11 10:10:23 +0530 | [diff] [blame] | 320 | if (IS_ERR(priv_arg)) { |
| 321 | dev_err(drvdata->dev, "%s: invalid user space pointer %lu\n", |
| 322 | __func__, arg); |
| 323 | return -EINVAL; |
| 324 | } |
| 325 | |
Abir Ghosh | 989d5e9 | 2016-10-09 11:47:28 +0300 | [diff] [blame] | 326 | mutex_lock(&drvdata->mutex); |
| 327 | |
| 328 | pr_debug("qbt1000_ioctl %d\n", cmd); |
| 329 | |
| 330 | switch (cmd) { |
| 331 | case QBT1000_LOAD_APP: |
| 332 | { |
| 333 | struct qbt1000_app app; |
| 334 | struct qseecom_handle *app_handle; |
| 335 | |
| 336 | if (copy_from_user(&app, priv_arg, |
| 337 | sizeof(app)) != 0) { |
| 338 | rc = -EFAULT; |
| 339 | pr_err("failed copy from user space-LOAD\n"); |
| 340 | goto end; |
| 341 | } |
| 342 | |
| 343 | if (!app.app_handle) { |
| 344 | dev_err(drvdata->dev, "%s: LOAD app_handle is null\n", |
| 345 | __func__); |
| 346 | rc = -EINVAL; |
| 347 | goto end; |
| 348 | } |
| 349 | |
Abir Ghosh | 80a366c | 2017-05-02 22:41:06 +0530 | [diff] [blame] | 350 | if (strcmp(app.name, FP_APP_NAME)) { |
| 351 | dev_err(drvdata->dev, "%s: Invalid app name\n", |
| 352 | __func__); |
| 353 | rc = -EINVAL; |
| 354 | goto end; |
| 355 | } |
| 356 | |
Abir Ghosh | 989d5e9 | 2016-10-09 11:47:28 +0300 | [diff] [blame] | 357 | if (drvdata->app_handle) { |
| 358 | dev_err(drvdata->dev, "%s: LOAD app already loaded, unloading first\n", |
| 359 | __func__); |
| 360 | drvdata->fp_app_handle = 0; |
| 361 | rc = qseecom_shutdown_app(&drvdata->app_handle); |
| 362 | if (rc != 0) { |
| 363 | dev_err(drvdata->dev, "%s: LOAD current app failed to shutdown\n", |
| 364 | __func__); |
| 365 | goto end; |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | pr_debug("app %s load before\n", app.name); |
Abir Ghosh | c0c670b | 2017-04-11 10:01:15 +0530 | [diff] [blame] | 370 | app.name[MAX_NAME_SIZE - 1] = '\0'; |
Abir Ghosh | 989d5e9 | 2016-10-09 11:47:28 +0300 | [diff] [blame] | 371 | |
| 372 | /* start the TZ app */ |
| 373 | rc = qseecom_start_app( |
| 374 | &drvdata->app_handle, app.name, app.size); |
| 375 | if (rc == 0) { |
| 376 | g_app_buf_size = app.size; |
| 377 | rc = qseecom_set_bandwidth(drvdata->app_handle, |
| 378 | app.high_band_width == 1 ? true : false); |
| 379 | if (rc != 0) { |
| 380 | /* log error, allow to continue */ |
| 381 | pr_err("App %s failed to set bw\n", app.name); |
| 382 | } |
| 383 | } else { |
Abir Ghosh | c0c670b | 2017-04-11 10:01:15 +0530 | [diff] [blame] | 384 | dev_err(drvdata->dev, "%s: Fingerprint Trusted App failed to load\n", |
| 385 | __func__); |
Abir Ghosh | 989d5e9 | 2016-10-09 11:47:28 +0300 | [diff] [blame] | 386 | goto end; |
| 387 | } |
| 388 | |
| 389 | /* copy a fake app handle to user */ |
| 390 | app_handle = drvdata->app_handle ? |
| 391 | (struct qseecom_handle *)123456 : 0; |
| 392 | rc = copy_to_user((void __user *)app.app_handle, &app_handle, |
| 393 | sizeof(*app.app_handle)); |
| 394 | |
| 395 | if (rc != 0) { |
| 396 | dev_err(drvdata->dev, |
| 397 | "%s: Failed copy 2us LOAD rc:%d\n", |
| 398 | __func__, rc); |
| 399 | rc = -ENOMEM; |
| 400 | goto end; |
| 401 | } |
| 402 | |
| 403 | pr_debug("app %s load after\n", app.name); |
| 404 | |
Abir Ghosh | 80a366c | 2017-05-02 22:41:06 +0530 | [diff] [blame] | 405 | drvdata->fp_app_handle = drvdata->app_handle; |
Abir Ghosh | 989d5e9 | 2016-10-09 11:47:28 +0300 | [diff] [blame] | 406 | break; |
| 407 | } |
| 408 | case QBT1000_UNLOAD_APP: |
| 409 | { |
| 410 | struct qbt1000_app app; |
| 411 | struct qseecom_handle *app_handle = 0; |
| 412 | |
| 413 | if (copy_from_user(&app, priv_arg, |
| 414 | sizeof(app)) != 0) { |
| 415 | rc = -ENOMEM; |
| 416 | pr_err("failed copy from user space-UNLOAD\n"); |
| 417 | goto end; |
| 418 | } |
| 419 | |
| 420 | if (!app.app_handle) { |
| 421 | dev_err(drvdata->dev, "%s: UNLOAD app_handle is null\n", |
| 422 | __func__); |
| 423 | rc = -EINVAL; |
| 424 | goto end; |
| 425 | } |
| 426 | |
| 427 | rc = copy_from_user(&app_handle, app.app_handle, |
| 428 | sizeof(app_handle)); |
| 429 | |
| 430 | if (rc != 0) { |
| 431 | dev_err(drvdata->dev, |
| 432 | "%s: Failed copy from user space-UNLOAD handle rc:%d\n", |
| 433 | __func__, rc); |
| 434 | rc = -ENOMEM; |
| 435 | goto end; |
| 436 | } |
| 437 | |
| 438 | /* if the app hasn't been loaded already, return err */ |
| 439 | if (!drvdata->app_handle) { |
| 440 | pr_err("app not loaded\n"); |
| 441 | rc = -EINVAL; |
| 442 | goto end; |
| 443 | } |
| 444 | |
| 445 | if (drvdata->fp_app_handle == drvdata->app_handle) |
| 446 | drvdata->fp_app_handle = 0; |
| 447 | |
| 448 | /* set bw & shutdown the TZ app */ |
| 449 | qseecom_set_bandwidth(drvdata->app_handle, |
| 450 | app.high_band_width == 1 ? true : false); |
| 451 | rc = qseecom_shutdown_app(&drvdata->app_handle); |
| 452 | if (rc != 0) { |
| 453 | pr_err("app failed to shutdown\n"); |
| 454 | goto end; |
| 455 | } |
| 456 | |
| 457 | /* copy the app handle (should be null) to user */ |
| 458 | rc = copy_to_user((void __user *)app.app_handle, &app_handle, |
| 459 | sizeof(*app.app_handle)); |
| 460 | |
| 461 | if (rc != 0) { |
| 462 | dev_err(drvdata->dev, |
| 463 | "%s: Failed copy 2us UNLOAD rc:%d\n", |
| 464 | __func__, rc); |
| 465 | rc = -ENOMEM; |
| 466 | goto end; |
| 467 | } |
| 468 | |
| 469 | break; |
| 470 | } |
| 471 | case QBT1000_SEND_TZCMD: |
| 472 | { |
| 473 | struct qbt1000_send_tz_cmd tzcmd; |
| 474 | void *rsp_buf; |
| 475 | |
| 476 | if (copy_from_user(&tzcmd, priv_arg, |
| 477 | sizeof(tzcmd)) |
| 478 | != 0) { |
| 479 | rc = -EFAULT; |
| 480 | pr_err("failed copy from user space %d\n", rc); |
| 481 | goto end; |
| 482 | } |
| 483 | |
| 484 | if (tzcmd.req_buf_len > g_app_buf_size || |
| 485 | tzcmd.rsp_buf_len > g_app_buf_size) { |
| 486 | rc = -ENOMEM; |
| 487 | pr_err("invalid cmd buf len, req=%d, rsp=%d\n", |
| 488 | tzcmd.req_buf_len, tzcmd.rsp_buf_len); |
| 489 | goto end; |
| 490 | } |
| 491 | |
| 492 | /* if the app hasn't been loaded already, return err */ |
| 493 | if (!drvdata->app_handle) { |
| 494 | pr_err("app not loaded\n"); |
| 495 | rc = -EINVAL; |
| 496 | goto end; |
| 497 | } |
| 498 | |
| 499 | rc = send_tz_cmd(drvdata, |
| 500 | drvdata->app_handle, 1, |
| 501 | tzcmd.req_buf, tzcmd.req_buf_len, |
| 502 | &rsp_buf, tzcmd.rsp_buf_len); |
| 503 | |
| 504 | if (rc < 0) { |
| 505 | pr_err("failure sending command to tz\n"); |
| 506 | goto end; |
| 507 | } |
| 508 | |
| 509 | /* copy rsp buf back to user space buffer */ |
| 510 | rc = copy_to_user((void __user *)tzcmd.rsp_buf, |
| 511 | rsp_buf, tzcmd.rsp_buf_len); |
| 512 | if (rc != 0) { |
| 513 | pr_err("failed copy 2us rc:%d bytes %d:\n", |
| 514 | rc, tzcmd.rsp_buf_len); |
| 515 | rc = -EFAULT; |
| 516 | goto end; |
| 517 | } |
| 518 | |
| 519 | break; |
| 520 | } |
| 521 | case QBT1000_SET_FINGER_DETECT_KEY: |
| 522 | { |
| 523 | struct qbt1000_set_finger_detect_key set_fd_key; |
| 524 | |
| 525 | if (copy_from_user(&set_fd_key, priv_arg, |
| 526 | sizeof(set_fd_key)) |
| 527 | != 0) { |
| 528 | rc = -EFAULT; |
| 529 | pr_err("failed copy from user space %d\n", rc); |
| 530 | goto end; |
| 531 | } |
| 532 | |
| 533 | drvdata->fd_gpio.key_code = set_fd_key.key_code; |
| 534 | |
| 535 | break; |
| 536 | } |
| 537 | case QBT1000_CONFIGURE_POWER_KEY: |
| 538 | { |
| 539 | struct qbt1000_configure_power_key power_key; |
| 540 | |
| 541 | if (copy_from_user(&power_key, priv_arg, |
| 542 | sizeof(power_key)) |
| 543 | != 0) { |
| 544 | rc = -EFAULT; |
| 545 | pr_err("failed copy from user space %d\n", rc); |
| 546 | goto end; |
| 547 | } |
| 548 | |
| 549 | drvdata->fd_gpio.power_key_enabled = power_key.enable; |
| 550 | |
| 551 | break; |
| 552 | } |
| 553 | default: |
| 554 | pr_err("invalid cmd %d\n", cmd); |
| 555 | rc = -ENOIOCTLCMD; |
| 556 | goto end; |
| 557 | } |
| 558 | |
| 559 | end: |
| 560 | mutex_unlock(&drvdata->mutex); |
| 561 | return rc; |
| 562 | } |
| 563 | |
| 564 | static int get_events_fifo_len_locked(struct qbt1000_drvdata *drvdata) |
| 565 | { |
| 566 | int len; |
| 567 | |
| 568 | mutex_lock(&drvdata->fw_events_mutex); |
| 569 | len = kfifo_len(&drvdata->fw_events); |
| 570 | mutex_unlock(&drvdata->fw_events_mutex); |
| 571 | |
| 572 | return len; |
| 573 | } |
| 574 | |
| 575 | static ssize_t qbt1000_read(struct file *filp, char __user *ubuf, |
| 576 | size_t cnt, loff_t *ppos) |
| 577 | { |
| 578 | struct fw_event_desc fw_event; |
| 579 | struct qbt1000_drvdata *drvdata = filp->private_data; |
| 580 | |
| 581 | if (cnt < sizeof(fw_event.ev)) |
| 582 | return -EINVAL; |
| 583 | |
| 584 | mutex_lock(&drvdata->fw_events_mutex); |
| 585 | |
| 586 | while (kfifo_len(&drvdata->fw_events) == 0) { |
| 587 | mutex_unlock(&drvdata->fw_events_mutex); |
| 588 | |
| 589 | if (filp->f_flags & O_NONBLOCK) |
| 590 | return -EAGAIN; |
| 591 | |
| 592 | pr_debug("fw_events fifo: empty, waiting\n"); |
| 593 | |
| 594 | if (wait_event_interruptible(drvdata->read_wait_queue, |
| 595 | (get_events_fifo_len_locked(drvdata) > 0))) |
| 596 | return -ERESTARTSYS; |
| 597 | |
| 598 | mutex_lock(&drvdata->fw_events_mutex); |
| 599 | } |
| 600 | |
| 601 | if (!kfifo_get(&drvdata->fw_events, &fw_event)) { |
| 602 | pr_debug("fw_events fifo: unexpectedly empty\n"); |
| 603 | |
| 604 | mutex_unlock(&drvdata->fw_events_mutex); |
| 605 | return -EINVAL; |
| 606 | } |
| 607 | |
| 608 | mutex_unlock(&drvdata->fw_events_mutex); |
| 609 | |
| 610 | pr_debug("fw_event: %d\n", (int)fw_event.ev); |
| 611 | return copy_to_user(ubuf, &fw_event.ev, sizeof(fw_event.ev)); |
| 612 | } |
| 613 | |
| 614 | static unsigned int qbt1000_poll(struct file *filp, |
| 615 | struct poll_table_struct *wait) |
| 616 | { |
| 617 | struct qbt1000_drvdata *drvdata = filp->private_data; |
| 618 | unsigned int mask = 0; |
| 619 | |
| 620 | poll_wait(filp, &drvdata->read_wait_queue, wait); |
| 621 | |
| 622 | if (kfifo_len(&drvdata->fw_events) > 0) |
| 623 | mask |= (POLLIN | POLLRDNORM); |
| 624 | |
| 625 | return mask; |
| 626 | } |
| 627 | |
| 628 | static const struct file_operations qbt1000_fops = { |
| 629 | .owner = THIS_MODULE, |
| 630 | .unlocked_ioctl = qbt1000_ioctl, |
| 631 | .open = qbt1000_open, |
| 632 | .release = qbt1000_release, |
| 633 | .read = qbt1000_read, |
| 634 | .poll = qbt1000_poll |
| 635 | }; |
| 636 | |
| 637 | static int qbt1000_dev_register(struct qbt1000_drvdata *drvdata) |
| 638 | { |
| 639 | dev_t dev_no; |
| 640 | int ret = 0; |
| 641 | size_t node_size; |
| 642 | char *node_name = QBT1000_DEV; |
| 643 | struct device *dev = drvdata->dev; |
| 644 | struct device *device; |
| 645 | |
| 646 | node_size = strlen(node_name) + 1; |
| 647 | |
| 648 | drvdata->qbt1000_node = devm_kzalloc(dev, node_size, GFP_KERNEL); |
| 649 | if (!drvdata->qbt1000_node) { |
| 650 | ret = -ENOMEM; |
| 651 | goto err_alloc; |
| 652 | } |
| 653 | |
| 654 | strlcpy(drvdata->qbt1000_node, node_name, node_size); |
| 655 | |
| 656 | ret = alloc_chrdev_region(&dev_no, 0, 1, drvdata->qbt1000_node); |
| 657 | if (ret) { |
| 658 | pr_err("alloc_chrdev_region failed %d\n", ret); |
| 659 | goto err_alloc; |
| 660 | } |
| 661 | |
| 662 | cdev_init(&drvdata->qbt1000_cdev, &qbt1000_fops); |
| 663 | |
| 664 | drvdata->qbt1000_cdev.owner = THIS_MODULE; |
| 665 | ret = cdev_add(&drvdata->qbt1000_cdev, dev_no, 1); |
| 666 | if (ret) { |
| 667 | pr_err("cdev_add failed %d\n", ret); |
| 668 | goto err_cdev_add; |
| 669 | } |
| 670 | |
| 671 | drvdata->qbt1000_class = class_create(THIS_MODULE, |
| 672 | drvdata->qbt1000_node); |
| 673 | if (IS_ERR(drvdata->qbt1000_class)) { |
| 674 | ret = PTR_ERR(drvdata->qbt1000_class); |
| 675 | pr_err("class_create failed %d\n", ret); |
| 676 | goto err_class_create; |
| 677 | } |
| 678 | |
| 679 | device = device_create(drvdata->qbt1000_class, NULL, |
| 680 | drvdata->qbt1000_cdev.dev, drvdata, |
| 681 | drvdata->qbt1000_node); |
| 682 | if (IS_ERR(device)) { |
| 683 | ret = PTR_ERR(device); |
| 684 | pr_err("device_create failed %d\n", ret); |
| 685 | goto err_dev_create; |
| 686 | } |
| 687 | |
| 688 | return 0; |
| 689 | err_dev_create: |
| 690 | class_destroy(drvdata->qbt1000_class); |
| 691 | err_class_create: |
| 692 | cdev_del(&drvdata->qbt1000_cdev); |
| 693 | err_cdev_add: |
| 694 | unregister_chrdev_region(drvdata->qbt1000_cdev.dev, 1); |
| 695 | err_alloc: |
| 696 | return ret; |
| 697 | } |
| 698 | |
| 699 | /** |
| 700 | * qbt1000_create_input_device() - Function allocates an input |
| 701 | * device, configures it for key events and registers it |
| 702 | * |
| 703 | * @drvdata: ptr to driver data |
| 704 | * |
| 705 | * Return: 0 on success. Error code on failure. |
| 706 | */ |
| 707 | static int qbt1000_create_input_device(struct qbt1000_drvdata *drvdata) |
| 708 | { |
| 709 | int rc = 0; |
| 710 | |
| 711 | drvdata->in_dev = input_allocate_device(); |
| 712 | if (drvdata->in_dev == NULL) { |
| 713 | dev_err(drvdata->dev, "%s: input_allocate_device() failed\n", |
| 714 | __func__); |
| 715 | rc = -ENOMEM; |
| 716 | goto end; |
| 717 | } |
| 718 | |
| 719 | drvdata->in_dev->name = QBT1000_IN_DEV_NAME; |
| 720 | drvdata->in_dev->phys = NULL; |
| 721 | drvdata->in_dev->id.bustype = BUS_HOST; |
| 722 | drvdata->in_dev->id.vendor = 0x0001; |
| 723 | drvdata->in_dev->id.product = 0x0001; |
| 724 | drvdata->in_dev->id.version = QBT1000_IN_DEV_VERSION; |
| 725 | |
| 726 | drvdata->in_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
| 727 | drvdata->in_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
| 728 | |
| 729 | drvdata->in_dev->keybit[BIT_WORD(KEY_HOMEPAGE)] |= |
| 730 | BIT_MASK(KEY_HOMEPAGE); |
| 731 | drvdata->in_dev->keybit[BIT_WORD(KEY_CAMERA)] |= |
| 732 | BIT_MASK(KEY_CAMERA); |
| 733 | drvdata->in_dev->keybit[BIT_WORD(KEY_VOLUMEDOWN)] |= |
| 734 | BIT_MASK(KEY_VOLUMEDOWN); |
| 735 | drvdata->in_dev->keybit[BIT_WORD(KEY_POWER)] |= |
| 736 | BIT_MASK(KEY_POWER); |
| 737 | |
| 738 | input_set_abs_params(drvdata->in_dev, ABS_X, |
| 739 | 0, |
| 740 | 1000, |
| 741 | 0, 0); |
| 742 | input_set_abs_params(drvdata->in_dev, ABS_Y, |
| 743 | 0, |
| 744 | 1000, |
| 745 | 0, 0); |
| 746 | |
| 747 | rc = input_register_device(drvdata->in_dev); |
| 748 | if (rc) { |
| 749 | dev_err(drvdata->dev, "%s: input_reg_dev() failed %d\n", |
| 750 | __func__, rc); |
| 751 | goto end; |
| 752 | } |
| 753 | |
| 754 | end: |
| 755 | if (rc) |
| 756 | input_free_device(drvdata->in_dev); |
| 757 | return rc; |
| 758 | } |
| 759 | |
| 760 | static void purge_finger_events(struct qbt1000_drvdata *drvdata) |
| 761 | { |
| 762 | int i, fifo_len; |
| 763 | struct fw_event_desc fw_event; |
| 764 | |
| 765 | fifo_len = kfifo_len(&drvdata->fw_events); |
| 766 | |
| 767 | for (i = 0; i < fifo_len; i++) { |
| 768 | if (!kfifo_get(&drvdata->fw_events, &fw_event)) |
| 769 | pr_err("fw events fifo: could not remove oldest item\n"); |
| 770 | else if (fw_event.ev != FW_EVENT_FINGER_DOWN |
| 771 | && fw_event.ev != FW_EVENT_FINGER_UP) |
| 772 | kfifo_put(&drvdata->fw_events, fw_event); |
| 773 | } |
| 774 | } |
| 775 | |
| 776 | static void qbt1000_gpio_report_event(struct qbt1000_drvdata *drvdata) |
| 777 | { |
| 778 | int state; |
| 779 | struct fw_event_desc fw_event; |
| 780 | |
| 781 | state = (__gpio_get_value(drvdata->fd_gpio.gpio) ? 1 : 0) |
| 782 | ^ drvdata->fd_gpio.active_low; |
| 783 | |
| 784 | if (drvdata->fd_gpio.event_reported |
| 785 | && state == drvdata->fd_gpio.last_gpio_state) |
| 786 | return; |
| 787 | |
| 788 | pr_debug("gpio %d: report state %d\n", drvdata->fd_gpio.gpio, state); |
| 789 | |
| 790 | drvdata->fd_gpio.event_reported = 1; |
| 791 | drvdata->fd_gpio.last_gpio_state = state; |
| 792 | |
| 793 | if (drvdata->fd_gpio.key_code) { |
| 794 | input_event(drvdata->in_dev, EV_KEY, |
| 795 | drvdata->fd_gpio.key_code, !!state); |
| 796 | input_sync(drvdata->in_dev); |
| 797 | } |
| 798 | |
| 799 | if (state && drvdata->fd_gpio.power_key_enabled) { |
| 800 | input_event(drvdata->in_dev, EV_KEY, KEY_POWER, 1); |
| 801 | input_sync(drvdata->in_dev); |
| 802 | input_event(drvdata->in_dev, EV_KEY, KEY_POWER, 0); |
| 803 | input_sync(drvdata->in_dev); |
| 804 | } |
| 805 | |
| 806 | fw_event.ev = (state ? FW_EVENT_FINGER_DOWN : FW_EVENT_FINGER_UP); |
| 807 | |
| 808 | mutex_lock(&drvdata->fw_events_mutex); |
| 809 | |
| 810 | if (kfifo_is_full(&drvdata->fw_events)) { |
| 811 | struct fw_event_desc dummy_fw_event; |
| 812 | |
| 813 | pr_warn("fw events fifo: full, dropping oldest item\n"); |
| 814 | if (!kfifo_get(&drvdata->fw_events, &dummy_fw_event)) |
| 815 | pr_err("fw events fifo: could not remove oldest item\n"); |
| 816 | } |
| 817 | |
| 818 | purge_finger_events(drvdata); |
| 819 | |
| 820 | if (!kfifo_put(&drvdata->fw_events, fw_event)) |
| 821 | pr_err("fw events fifo: error adding item\n"); |
| 822 | |
| 823 | mutex_unlock(&drvdata->fw_events_mutex); |
| 824 | wake_up_interruptible(&drvdata->read_wait_queue); |
| 825 | } |
| 826 | |
| 827 | static void qbt1000_gpio_work_func(struct work_struct *work) |
| 828 | { |
| 829 | struct qbt1000_drvdata *drvdata = |
| 830 | container_of(work, struct qbt1000_drvdata, fd_gpio.work); |
| 831 | |
| 832 | qbt1000_gpio_report_event(drvdata); |
| 833 | |
| 834 | pm_relax(drvdata->dev); |
| 835 | } |
| 836 | |
| 837 | static irqreturn_t qbt1000_gpio_isr(int irq, void *dev_id) |
| 838 | { |
| 839 | struct qbt1000_drvdata *drvdata = dev_id; |
| 840 | |
| 841 | if (irq != drvdata->fd_gpio.irq) { |
| 842 | pr_warn("invalid irq %d (expected %d)\n", |
| 843 | irq, drvdata->fd_gpio.irq); |
| 844 | return IRQ_HANDLED; |
| 845 | } |
| 846 | |
| 847 | pm_stay_awake(drvdata->dev); |
| 848 | schedule_work(&drvdata->fd_gpio.work); |
| 849 | |
| 850 | return IRQ_HANDLED; |
| 851 | } |
| 852 | |
| 853 | /** |
| 854 | * qbt1000_ipc_irq_handler() - function processes IPC |
| 855 | * interrupts on its own thread |
| 856 | * @irq: the interrupt that occurred |
| 857 | * @dev_id: pointer to the qbt1000_drvdata |
| 858 | * |
| 859 | * Return: IRQ_HANDLED when complete |
| 860 | */ |
| 861 | static irqreturn_t qbt1000_ipc_irq_handler(int irq, void *dev_id) |
| 862 | { |
| 863 | uint8_t *msg_buffer; |
| 864 | struct fw_ipc_cmd *rx_cmd; |
| 865 | struct fw_ipc_header *header; |
| 866 | int i, j; |
| 867 | uint32_t rxipc = FP_APP_CMD_RX_IPC; |
| 868 | struct qbt1000_drvdata *drvdata = (struct qbt1000_drvdata *)dev_id; |
| 869 | int rc = 0; |
| 870 | uint32_t retry_count = 10; |
| 871 | |
| 872 | pm_stay_awake(drvdata->dev); |
| 873 | |
| 874 | mutex_lock(&drvdata->mutex); |
| 875 | |
| 876 | if (irq != drvdata->fw_ipc.irq) { |
| 877 | pr_warn("invalid irq %d (expected %d)\n", |
| 878 | irq, drvdata->fw_ipc.irq); |
| 879 | goto end; |
| 880 | } |
| 881 | |
| 882 | pr_debug("firmware interrupt received (irq %d)\n", irq); |
| 883 | |
| 884 | if (!drvdata->fp_app_handle) |
| 885 | goto end; |
| 886 | |
| 887 | while (retry_count > 0) { |
| 888 | /* |
| 889 | * send the TZ command to fetch the message from firmware |
| 890 | * TZ will process the message if it can |
| 891 | */ |
| 892 | rc = send_tz_cmd(drvdata, drvdata->fp_app_handle, 0, |
| 893 | &rxipc, sizeof(rxipc), |
| 894 | (void *)&rx_cmd, sizeof(*rx_cmd)); |
| 895 | if (rc < 0) { |
| 896 | msleep(50); // sleep for 50ms before retry |
| 897 | retry_count -= 1; |
| 898 | continue; |
| 899 | } else { |
| 900 | pr_err("retry_count %d\n", retry_count); |
| 901 | break; |
| 902 | } |
| 903 | } |
| 904 | |
| 905 | if (rc < 0) { |
| 906 | pr_err("failure sending tz cmd %d\n", rxipc); |
| 907 | goto end; |
| 908 | } |
| 909 | |
| 910 | if (rx_cmd->status != 0) { |
| 911 | pr_err("tz command failed to complete\n"); |
| 912 | goto end; |
| 913 | } |
| 914 | |
| 915 | msg_buffer = rx_cmd->msg_data; |
| 916 | |
| 917 | for (j = 0; j < rx_cmd->numMsgs; j++) { |
| 918 | header = (struct fw_ipc_header *) msg_buffer; |
| 919 | /* |
| 920 | * given the IPC message type, search for a corresponding |
| 921 | * event for the driver client. If found, add to the events |
| 922 | * FIFO |
| 923 | */ |
| 924 | for (i = 0; i < ARRAY_SIZE(g_msg_to_event); i++) { |
| 925 | if (g_msg_to_event[i].msg_type == header->msg_type) { |
| 926 | enum qbt1000_fw_event ev = |
| 927 | g_msg_to_event[i].fw_event; |
| 928 | struct fw_event_desc fw_ev_desc; |
| 929 | |
| 930 | mutex_lock(&drvdata->fw_events_mutex); |
| 931 | pr_debug("fw events: add %d\n", (int) ev); |
| 932 | fw_ev_desc.ev = ev; |
| 933 | |
| 934 | if (!kfifo_put(&drvdata->fw_events, fw_ev_desc)) |
| 935 | pr_err("fw events: fifo full, drop event %d\n", |
| 936 | (int) ev); |
| 937 | |
| 938 | mutex_unlock(&drvdata->fw_events_mutex); |
| 939 | break; |
| 940 | } |
| 941 | } |
| 942 | msg_buffer += sizeof(*header) + header->msg_len; |
| 943 | } |
| 944 | wake_up_interruptible(&drvdata->read_wait_queue); |
| 945 | end: |
| 946 | mutex_unlock(&drvdata->mutex); |
| 947 | pm_relax(drvdata->dev); |
| 948 | return IRQ_HANDLED; |
| 949 | } |
| 950 | |
| 951 | static int setup_fd_gpio_irq(struct platform_device *pdev, |
| 952 | struct qbt1000_drvdata *drvdata) |
| 953 | { |
| 954 | int rc = 0; |
| 955 | int irq; |
| 956 | const char *desc = "qbt_finger_detect"; |
| 957 | |
| 958 | rc = devm_gpio_request_one(&pdev->dev, drvdata->fd_gpio.gpio, |
| 959 | GPIOF_IN, desc); |
| 960 | |
| 961 | if (rc < 0) { |
| 962 | pr_err("failed to request gpio %d, error %d\n", |
| 963 | drvdata->fd_gpio.gpio, rc); |
| 964 | goto end; |
| 965 | } |
| 966 | |
| 967 | irq = gpio_to_irq(drvdata->fd_gpio.gpio); |
| 968 | if (irq < 0) { |
| 969 | rc = irq; |
| 970 | pr_err("unable to get irq number for gpio %d, error %d\n", |
| 971 | drvdata->fd_gpio.gpio, rc); |
| 972 | goto end; |
| 973 | } |
| 974 | |
| 975 | drvdata->fd_gpio.irq = irq; |
| 976 | INIT_WORK(&drvdata->fd_gpio.work, qbt1000_gpio_work_func); |
| 977 | |
| 978 | rc = devm_request_any_context_irq(&pdev->dev, drvdata->fd_gpio.irq, |
| 979 | qbt1000_gpio_isr, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, |
| 980 | desc, drvdata); |
| 981 | |
| 982 | if (rc < 0) { |
| 983 | pr_err("unable to claim irq %d; error %d\n", |
| 984 | drvdata->fd_gpio.irq, rc); |
| 985 | goto end; |
| 986 | } |
| 987 | |
| 988 | end: |
| 989 | return rc; |
| 990 | } |
| 991 | |
| 992 | static int setup_ipc_irq(struct platform_device *pdev, |
| 993 | struct qbt1000_drvdata *drvdata) |
| 994 | { |
| 995 | int rc = 0; |
| 996 | const char *desc = "qbt_ipc"; |
| 997 | |
| 998 | drvdata->fw_ipc.irq = gpio_to_irq(drvdata->fw_ipc.gpio); |
| 999 | pr_debug("\nirq %d gpio %d\n", |
| 1000 | drvdata->fw_ipc.irq, drvdata->fw_ipc.gpio); |
| 1001 | if (drvdata->fw_ipc.irq < 0) { |
| 1002 | rc = drvdata->fw_ipc.irq; |
| 1003 | pr_err("no irq for gpio %d, error=%d\n", |
| 1004 | drvdata->fw_ipc.gpio, rc); |
| 1005 | goto end; |
| 1006 | } |
| 1007 | |
| 1008 | rc = devm_gpio_request_one(&pdev->dev, drvdata->fw_ipc.gpio, |
| 1009 | GPIOF_IN, desc); |
| 1010 | |
| 1011 | if (rc < 0) { |
| 1012 | pr_err("failed to request gpio %d, error %d\n", |
| 1013 | drvdata->fw_ipc.gpio, rc); |
| 1014 | goto end; |
| 1015 | } |
| 1016 | |
| 1017 | rc = devm_request_threaded_irq(&pdev->dev, |
| 1018 | drvdata->fw_ipc.irq, |
| 1019 | NULL, |
| 1020 | qbt1000_ipc_irq_handler, |
| 1021 | IRQF_ONESHOT | IRQF_TRIGGER_RISING, |
| 1022 | desc, |
| 1023 | drvdata); |
| 1024 | |
| 1025 | if (rc < 0) { |
| 1026 | pr_err("failed to register for ipc irq %d, rc = %d\n", |
| 1027 | drvdata->fw_ipc.irq, rc); |
| 1028 | goto end; |
| 1029 | } |
| 1030 | |
| 1031 | end: |
| 1032 | return rc; |
| 1033 | } |
| 1034 | |
| 1035 | /** |
| 1036 | * qbt1000_read_device_tree() - Function reads device tree |
| 1037 | * properties into driver data |
| 1038 | * @pdev: ptr to platform device object |
| 1039 | * @drvdata: ptr to driver data |
| 1040 | * |
| 1041 | * Return: 0 on success. Error code on failure. |
| 1042 | */ |
| 1043 | static int qbt1000_read_device_tree(struct platform_device *pdev, |
| 1044 | struct qbt1000_drvdata *drvdata) |
| 1045 | { |
| 1046 | int rc = 0; |
| 1047 | uint32_t rate; |
| 1048 | int gpio; |
| 1049 | enum of_gpio_flags flags; |
| 1050 | |
| 1051 | /* read clock frequency */ |
| 1052 | if (of_property_read_u32(pdev->dev.of_node, |
| 1053 | "clock-frequency", &rate) == 0) { |
| 1054 | pr_debug("clk frequency %d\n", rate); |
| 1055 | drvdata->frequency = rate; |
| 1056 | } |
| 1057 | |
| 1058 | /* read IPC gpio */ |
| 1059 | drvdata->fw_ipc.gpio = of_get_named_gpio(pdev->dev.of_node, |
| 1060 | "qcom,ipc-gpio", 0); |
| 1061 | if (drvdata->fw_ipc.gpio < 0) { |
| 1062 | rc = drvdata->fw_ipc.gpio; |
| 1063 | pr_err("ipc gpio not found, error=%d\n", rc); |
| 1064 | goto end; |
| 1065 | } |
| 1066 | |
| 1067 | /** |
| 1068 | * TODO: Need to revisit after adding GPIO in DTSI- read |
| 1069 | * finger detect GPIO configuration |
| 1070 | */ |
| 1071 | |
| 1072 | gpio = of_get_named_gpio_flags(pdev->dev.of_node, |
| 1073 | "qcom,finger-detect-gpio", 0, &flags); |
| 1074 | if (gpio < 0) { |
| 1075 | pr_err("failed to get gpio flags\n"); |
| 1076 | rc = gpio; |
| 1077 | goto end; |
| 1078 | } |
| 1079 | |
| 1080 | drvdata->fd_gpio.gpio = gpio; |
| 1081 | drvdata->fd_gpio.active_low = flags & OF_GPIO_ACTIVE_LOW; |
| 1082 | |
| 1083 | end: |
| 1084 | return rc; |
| 1085 | } |
| 1086 | |
| 1087 | /** |
| 1088 | * qbt1000_probe() - Function loads hardware config from device tree |
| 1089 | * @pdev: ptr to platform device object |
| 1090 | * |
| 1091 | * Return: 0 on success. Error code on failure. |
| 1092 | */ |
| 1093 | static int qbt1000_probe(struct platform_device *pdev) |
| 1094 | { |
| 1095 | struct device *dev = &pdev->dev; |
| 1096 | struct qbt1000_drvdata *drvdata; |
| 1097 | int rc = 0; |
| 1098 | |
| 1099 | pr_debug("qbt1000_probe begin\n"); |
| 1100 | drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); |
| 1101 | if (!drvdata) |
| 1102 | return -ENOMEM; |
| 1103 | |
| 1104 | drvdata->dev = &pdev->dev; |
| 1105 | platform_set_drvdata(pdev, drvdata); |
| 1106 | |
| 1107 | rc = qbt1000_read_device_tree(pdev, drvdata); |
| 1108 | if (rc < 0) |
| 1109 | goto end; |
| 1110 | |
| 1111 | atomic_set(&drvdata->available, 1); |
| 1112 | |
| 1113 | mutex_init(&drvdata->mutex); |
| 1114 | mutex_init(&drvdata->fw_events_mutex); |
| 1115 | |
| 1116 | rc = qbt1000_dev_register(drvdata); |
| 1117 | if (rc < 0) |
| 1118 | goto end; |
| 1119 | |
| 1120 | INIT_KFIFO(drvdata->fw_events); |
| 1121 | init_waitqueue_head(&drvdata->read_wait_queue); |
| 1122 | |
| 1123 | rc = qbt1000_create_input_device(drvdata); |
| 1124 | if (rc < 0) |
| 1125 | goto end; |
| 1126 | |
| 1127 | rc = setup_fd_gpio_irq(pdev, drvdata); |
| 1128 | if (rc < 0) |
| 1129 | goto end; |
| 1130 | |
| 1131 | rc = setup_ipc_irq(pdev, drvdata); |
| 1132 | if (rc < 0) |
| 1133 | goto end; |
| 1134 | |
| 1135 | rc = device_init_wakeup(&pdev->dev, 1); |
| 1136 | if (rc < 0) |
| 1137 | goto end; |
| 1138 | |
| 1139 | end: |
| 1140 | pr_debug("qbt1000_probe end : %d\n", rc); |
| 1141 | return rc; |
| 1142 | } |
| 1143 | |
| 1144 | static int qbt1000_remove(struct platform_device *pdev) |
| 1145 | { |
| 1146 | struct qbt1000_drvdata *drvdata = platform_get_drvdata(pdev); |
| 1147 | |
| 1148 | input_unregister_device(drvdata->in_dev); |
| 1149 | |
| 1150 | mutex_destroy(&drvdata->mutex); |
| 1151 | mutex_destroy(&drvdata->fw_events_mutex); |
| 1152 | |
| 1153 | device_destroy(drvdata->qbt1000_class, drvdata->qbt1000_cdev.dev); |
| 1154 | class_destroy(drvdata->qbt1000_class); |
| 1155 | cdev_del(&drvdata->qbt1000_cdev); |
| 1156 | unregister_chrdev_region(drvdata->qbt1000_cdev.dev, 1); |
| 1157 | |
| 1158 | device_init_wakeup(&pdev->dev, 0); |
| 1159 | |
| 1160 | return 0; |
| 1161 | } |
| 1162 | |
| 1163 | static int qbt1000_suspend(struct platform_device *pdev, pm_message_t state) |
| 1164 | { |
| 1165 | int rc = 0; |
| 1166 | struct qbt1000_drvdata *drvdata = platform_get_drvdata(pdev); |
| 1167 | |
| 1168 | /* |
| 1169 | * Returning an error code if driver currently making a TZ call. |
| 1170 | * Note: The purpose of this driver is to ensure that the clocks are on |
| 1171 | * while making a TZ call. Hence the clock check to determine if the |
| 1172 | * driver will allow suspend to occur. |
| 1173 | */ |
| 1174 | if (!mutex_trylock(&drvdata->mutex)) |
| 1175 | return -EBUSY; |
| 1176 | |
| 1177 | if (drvdata->clock_state) |
| 1178 | rc = -EBUSY; |
| 1179 | else { |
| 1180 | enable_irq_wake(drvdata->fd_gpio.irq); |
| 1181 | enable_irq_wake(drvdata->fw_ipc.irq); |
| 1182 | } |
| 1183 | |
| 1184 | mutex_unlock(&drvdata->mutex); |
| 1185 | |
| 1186 | return rc; |
| 1187 | } |
| 1188 | |
| 1189 | static int qbt1000_resume(struct platform_device *pdev) |
| 1190 | { |
| 1191 | struct qbt1000_drvdata *drvdata = platform_get_drvdata(pdev); |
| 1192 | |
| 1193 | disable_irq_wake(drvdata->fd_gpio.irq); |
| 1194 | disable_irq_wake(drvdata->fw_ipc.irq); |
| 1195 | |
| 1196 | return 0; |
| 1197 | } |
| 1198 | |
| 1199 | static const struct of_device_id qbt1000_match[] = { |
| 1200 | { .compatible = "qcom,qbt1000" }, |
| 1201 | {} |
| 1202 | }; |
| 1203 | |
| 1204 | static struct platform_driver qbt1000_plat_driver = { |
| 1205 | .probe = qbt1000_probe, |
| 1206 | .remove = qbt1000_remove, |
| 1207 | .suspend = qbt1000_suspend, |
| 1208 | .resume = qbt1000_resume, |
| 1209 | .driver = { |
| 1210 | .name = "qbt1000", |
| 1211 | .owner = THIS_MODULE, |
| 1212 | .of_match_table = qbt1000_match, |
| 1213 | }, |
| 1214 | }; |
| 1215 | |
| 1216 | module_platform_driver(qbt1000_plat_driver); |
| 1217 | |
| 1218 | MODULE_LICENSE("GPL v2"); |
| 1219 | MODULE_DESCRIPTION("Qualcomm Technologies, Inc. QBT1000 driver"); |