Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 1 | /* Copyright (c) 2015-2017, 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 | |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/fs.h> |
| 16 | #include <linux/reboot.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/irq.h> |
| 19 | #include <linux/delay.h> |
| 20 | #include <linux/interrupt.h> |
| 21 | #include <linux/gpio.h> |
| 22 | #include <linux/spinlock.h> |
| 23 | #include <linux/of_gpio.h> |
| 24 | #include <linux/of_device.h> |
| 25 | #include <linux/uaccess.h> |
| 26 | #include "nq-nci.h" |
| 27 | #include <linux/clk.h> |
| 28 | #ifdef CONFIG_COMPAT |
| 29 | #include <linux/compat.h> |
| 30 | #endif |
| 31 | |
| 32 | struct nqx_platform_data { |
| 33 | unsigned int irq_gpio; |
| 34 | unsigned int en_gpio; |
| 35 | unsigned int clkreq_gpio; |
| 36 | unsigned int firm_gpio; |
| 37 | unsigned int ese_gpio; |
| 38 | const char *clk_src_name; |
| 39 | }; |
| 40 | |
| 41 | static const struct of_device_id msm_match_table[] = { |
| 42 | {.compatible = "qcom,nq-nci"}, |
| 43 | {} |
| 44 | }; |
| 45 | |
| 46 | MODULE_DEVICE_TABLE(of, msm_match_table); |
| 47 | |
| 48 | #define MAX_BUFFER_SIZE (320) |
| 49 | #define WAKEUP_SRC_TIMEOUT (2000) |
| 50 | #define MAX_RETRY_COUNT 3 |
| 51 | |
| 52 | struct nqx_dev { |
| 53 | wait_queue_head_t read_wq; |
| 54 | struct mutex read_mutex; |
| 55 | struct i2c_client *client; |
| 56 | struct miscdevice nqx_device; |
| 57 | union nqx_uinfo nqx_info; |
| 58 | /* NFC GPIO variables */ |
| 59 | unsigned int irq_gpio; |
| 60 | unsigned int en_gpio; |
| 61 | unsigned int firm_gpio; |
| 62 | unsigned int clkreq_gpio; |
| 63 | unsigned int ese_gpio; |
| 64 | /* NFC VEN pin state powered by Nfc */ |
| 65 | bool nfc_ven_enabled; |
| 66 | /* NFC_IRQ state */ |
| 67 | bool irq_enabled; |
| 68 | /* NFC_IRQ wake-up state */ |
| 69 | bool irq_wake_up; |
| 70 | spinlock_t irq_enabled_lock; |
| 71 | unsigned int count_irq; |
| 72 | /* Initial CORE RESET notification */ |
| 73 | unsigned int core_reset_ntf; |
| 74 | /* CLK control */ |
| 75 | bool clk_run; |
| 76 | struct clk *s_clk; |
| 77 | /* read buffer*/ |
| 78 | size_t kbuflen; |
| 79 | u8 *kbuf; |
| 80 | struct nqx_platform_data *pdata; |
| 81 | }; |
| 82 | |
| 83 | static int nfcc_reboot(struct notifier_block *notifier, unsigned long val, |
| 84 | void *v); |
| 85 | /*clock enable function*/ |
| 86 | static int nqx_clock_select(struct nqx_dev *nqx_dev); |
| 87 | /*clock disable function*/ |
| 88 | static int nqx_clock_deselect(struct nqx_dev *nqx_dev); |
| 89 | static struct notifier_block nfcc_notifier = { |
| 90 | .notifier_call = nfcc_reboot, |
| 91 | .next = NULL, |
| 92 | .priority = 0 |
| 93 | }; |
| 94 | |
| 95 | unsigned int disable_ctrl; |
| 96 | |
| 97 | static void nqx_init_stat(struct nqx_dev *nqx_dev) |
| 98 | { |
| 99 | nqx_dev->count_irq = 0; |
| 100 | } |
| 101 | |
| 102 | static void nqx_disable_irq(struct nqx_dev *nqx_dev) |
| 103 | { |
| 104 | unsigned long flags; |
| 105 | |
| 106 | spin_lock_irqsave(&nqx_dev->irq_enabled_lock, flags); |
| 107 | if (nqx_dev->irq_enabled) { |
| 108 | disable_irq_nosync(nqx_dev->client->irq); |
| 109 | nqx_dev->irq_enabled = false; |
| 110 | } |
| 111 | spin_unlock_irqrestore(&nqx_dev->irq_enabled_lock, flags); |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * nqx_enable_irq() |
| 116 | * |
| 117 | * Check if interrupt is enabled or not |
| 118 | * and enable interrupt |
| 119 | * |
| 120 | * Return: void |
| 121 | */ |
| 122 | static void nqx_enable_irq(struct nqx_dev *nqx_dev) |
| 123 | { |
| 124 | unsigned long flags; |
| 125 | |
| 126 | spin_lock_irqsave(&nqx_dev->irq_enabled_lock, flags); |
| 127 | if (!nqx_dev->irq_enabled) { |
| 128 | nqx_dev->irq_enabled = true; |
| 129 | enable_irq(nqx_dev->client->irq); |
| 130 | } |
| 131 | spin_unlock_irqrestore(&nqx_dev->irq_enabled_lock, flags); |
| 132 | } |
| 133 | |
| 134 | static irqreturn_t nqx_dev_irq_handler(int irq, void *dev_id) |
| 135 | { |
| 136 | struct nqx_dev *nqx_dev = dev_id; |
| 137 | unsigned long flags; |
| 138 | |
| 139 | if (device_may_wakeup(&nqx_dev->client->dev)) |
| 140 | pm_wakeup_event(&nqx_dev->client->dev, WAKEUP_SRC_TIMEOUT); |
| 141 | |
| 142 | nqx_disable_irq(nqx_dev); |
| 143 | spin_lock_irqsave(&nqx_dev->irq_enabled_lock, flags); |
| 144 | nqx_dev->count_irq++; |
| 145 | spin_unlock_irqrestore(&nqx_dev->irq_enabled_lock, flags); |
| 146 | wake_up(&nqx_dev->read_wq); |
| 147 | |
| 148 | return IRQ_HANDLED; |
| 149 | } |
| 150 | |
| 151 | static ssize_t nfc_read(struct file *filp, char __user *buf, |
| 152 | size_t count, loff_t *offset) |
| 153 | { |
| 154 | struct nqx_dev *nqx_dev = filp->private_data; |
| 155 | unsigned char *tmp = NULL; |
| 156 | int ret; |
| 157 | int irq_gpio_val = 0; |
| 158 | |
| 159 | if (!nqx_dev) { |
| 160 | ret = -ENODEV; |
| 161 | goto out; |
| 162 | } |
| 163 | |
| 164 | if (count > nqx_dev->kbuflen) |
| 165 | count = nqx_dev->kbuflen; |
| 166 | |
| 167 | dev_dbg(&nqx_dev->client->dev, "%s : reading %zu bytes.\n", |
| 168 | __func__, count); |
| 169 | |
| 170 | mutex_lock(&nqx_dev->read_mutex); |
| 171 | |
| 172 | irq_gpio_val = gpio_get_value(nqx_dev->irq_gpio); |
| 173 | if (irq_gpio_val == 0) { |
| 174 | if (filp->f_flags & O_NONBLOCK) { |
| 175 | dev_err(&nqx_dev->client->dev, |
| 176 | ":f_falg has O_NONBLOCK. EAGAIN\n"); |
| 177 | ret = -EAGAIN; |
| 178 | goto err; |
| 179 | } |
| 180 | while (1) { |
| 181 | ret = 0; |
| 182 | if (!nqx_dev->irq_enabled) { |
| 183 | nqx_dev->irq_enabled = true; |
| 184 | enable_irq(nqx_dev->client->irq); |
| 185 | } |
| 186 | if (!gpio_get_value(nqx_dev->irq_gpio)) { |
| 187 | ret = wait_event_interruptible(nqx_dev->read_wq, |
| 188 | !nqx_dev->irq_enabled); |
| 189 | } |
| 190 | if (ret) |
| 191 | goto err; |
| 192 | nqx_disable_irq(nqx_dev); |
| 193 | |
| 194 | if (gpio_get_value(nqx_dev->irq_gpio)) |
| 195 | break; |
| 196 | dev_err_ratelimited(&nqx_dev->client->dev, |
| 197 | "gpio is low, no need to read data\n"); |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | tmp = nqx_dev->kbuf; |
| 202 | if (!tmp) { |
| 203 | dev_err(&nqx_dev->client->dev, |
| 204 | "%s: device doesn't exist anymore\n", __func__); |
| 205 | ret = -ENODEV; |
| 206 | goto err; |
| 207 | } |
| 208 | memset(tmp, 0x00, count); |
| 209 | |
| 210 | /* Read data */ |
| 211 | ret = i2c_master_recv(nqx_dev->client, tmp, count); |
| 212 | if (ret < 0) { |
| 213 | dev_err(&nqx_dev->client->dev, |
| 214 | "%s: i2c_master_recv returned %d\n", __func__, ret); |
| 215 | goto err; |
| 216 | } |
| 217 | if (ret > count) { |
| 218 | dev_err(&nqx_dev->client->dev, |
| 219 | "%s: received too many bytes from i2c (%d)\n", |
| 220 | __func__, ret); |
| 221 | ret = -EIO; |
| 222 | goto err; |
| 223 | } |
| 224 | #ifdef NFC_KERNEL_BU |
| 225 | dev_dbg(&nqx_dev->client->dev, "%s : NfcNciRx %x %x %x\n", |
| 226 | __func__, tmp[0], tmp[1], tmp[2]); |
| 227 | #endif |
| 228 | if (copy_to_user(buf, tmp, ret)) { |
| 229 | dev_warn(&nqx_dev->client->dev, |
| 230 | "%s : failed to copy to user space\n", __func__); |
| 231 | ret = -EFAULT; |
| 232 | goto err; |
| 233 | } |
| 234 | mutex_unlock(&nqx_dev->read_mutex); |
| 235 | return ret; |
| 236 | |
| 237 | err: |
| 238 | mutex_unlock(&nqx_dev->read_mutex); |
| 239 | out: |
| 240 | return ret; |
| 241 | } |
| 242 | |
| 243 | static ssize_t nfc_write(struct file *filp, const char __user *buf, |
| 244 | size_t count, loff_t *offset) |
| 245 | { |
| 246 | struct nqx_dev *nqx_dev = filp->private_data; |
| 247 | char *tmp = NULL; |
| 248 | int ret = 0; |
| 249 | |
| 250 | if (!nqx_dev) { |
| 251 | ret = -ENODEV; |
| 252 | goto out; |
| 253 | } |
| 254 | if (count > nqx_dev->kbuflen) { |
| 255 | dev_err(&nqx_dev->client->dev, "%s: out of memory\n", |
| 256 | __func__); |
| 257 | ret = -ENOMEM; |
| 258 | goto out; |
| 259 | } |
| 260 | |
| 261 | tmp = memdup_user(buf, count); |
| 262 | if (IS_ERR(tmp)) { |
| 263 | dev_err(&nqx_dev->client->dev, "%s: memdup_user failed\n", |
| 264 | __func__); |
| 265 | ret = PTR_ERR(tmp); |
| 266 | goto out; |
| 267 | } |
| 268 | |
| 269 | ret = i2c_master_send(nqx_dev->client, tmp, count); |
| 270 | if (ret != count) { |
| 271 | dev_err(&nqx_dev->client->dev, |
| 272 | "%s: failed to write %d\n", __func__, ret); |
| 273 | ret = -EIO; |
| 274 | goto out_free; |
| 275 | } |
| 276 | #ifdef NFC_KERNEL_BU |
| 277 | dev_dbg(&nqx_dev->client->dev, |
| 278 | "%s : i2c-%d: NfcNciTx %x %x %x\n", |
| 279 | __func__, iminor(file_inode(filp)), |
| 280 | tmp[0], tmp[1], tmp[2]); |
| 281 | #endif |
| 282 | usleep_range(1000, 1100); |
| 283 | out_free: |
| 284 | kfree(tmp); |
| 285 | out: |
| 286 | return ret; |
| 287 | } |
| 288 | |
| 289 | /** |
| 290 | * nqx_standby_write() |
| 291 | * @buf: pointer to data buffer |
| 292 | * @len: # of bytes need to transfer |
| 293 | * |
| 294 | * write data buffer over I2C and retry |
| 295 | * if NFCC is in stand by mode |
| 296 | * |
| 297 | * Return: # of bytes written or -ve value in case of error |
| 298 | */ |
| 299 | static int nqx_standby_write(struct nqx_dev *nqx_dev, |
| 300 | const unsigned char *buf, size_t len) |
| 301 | { |
| 302 | int ret = -EINVAL; |
| 303 | int retry_cnt; |
| 304 | |
| 305 | for (retry_cnt = 1; retry_cnt <= MAX_RETRY_COUNT; retry_cnt++) { |
| 306 | ret = i2c_master_send(nqx_dev->client, buf, len); |
| 307 | if (ret < 0) { |
| 308 | dev_err(&nqx_dev->client->dev, |
| 309 | "%s: write failed, Maybe in Standby Mode - Retry(%d)\n", |
| 310 | __func__, retry_cnt); |
| 311 | usleep_range(1000, 1100); |
| 312 | } else if (ret == len) |
| 313 | break; |
| 314 | } |
| 315 | return ret; |
| 316 | } |
| 317 | |
| 318 | /* |
| 319 | * Power management of the eSE |
| 320 | * NFC & eSE ON : NFC_EN high and eSE_pwr_req high. |
| 321 | * NFC OFF & eSE ON : NFC_EN high and eSE_pwr_req high. |
| 322 | * NFC OFF & eSE OFF : NFC_EN low and eSE_pwr_req low. |
| 323 | */ |
| 324 | static int nqx_ese_pwr(struct nqx_dev *nqx_dev, unsigned long int arg) |
| 325 | { |
| 326 | int r = -1; |
| 327 | const unsigned char svdd_off_cmd_warn[] = {0x2F, 0x31, 0x01, 0x01}; |
| 328 | const unsigned char svdd_off_cmd_done[] = {0x2F, 0x31, 0x01, 0x00}; |
| 329 | |
| 330 | if (!gpio_is_valid(nqx_dev->ese_gpio)) { |
| 331 | dev_err(&nqx_dev->client->dev, |
| 332 | "%s: ese_gpio is not valid\n", __func__); |
| 333 | return -EINVAL; |
| 334 | } |
| 335 | |
| 336 | if (arg == 0) { |
| 337 | /* |
| 338 | * We want to power on the eSE and to do so we need the |
| 339 | * eSE_pwr_req pin and the NFC_EN pin to be high |
| 340 | */ |
| 341 | if (gpio_get_value(nqx_dev->ese_gpio)) { |
| 342 | dev_dbg(&nqx_dev->client->dev, "ese_gpio is already high\n"); |
| 343 | r = 0; |
| 344 | } else { |
| 345 | /** |
| 346 | * Let's store the NFC_EN pin state |
| 347 | * only if the eSE is not yet on |
| 348 | */ |
| 349 | nqx_dev->nfc_ven_enabled = |
| 350 | gpio_get_value(nqx_dev->en_gpio); |
| 351 | if (!nqx_dev->nfc_ven_enabled) { |
| 352 | gpio_set_value(nqx_dev->en_gpio, 1); |
| 353 | /* hardware dependent delay */ |
| 354 | usleep_range(1000, 1100); |
| 355 | } |
| 356 | gpio_set_value(nqx_dev->ese_gpio, 1); |
| 357 | if (gpio_get_value(nqx_dev->ese_gpio)) { |
| 358 | dev_dbg(&nqx_dev->client->dev, "ese_gpio is enabled\n"); |
| 359 | r = 0; |
| 360 | } |
| 361 | } |
| 362 | } else if (arg == 1) { |
| 363 | if (nqx_dev->nfc_ven_enabled && |
| 364 | ((nqx_dev->nqx_info.info.chip_type == NFCC_NQ_220) || |
| 365 | (nqx_dev->nqx_info.info.chip_type == NFCC_PN66T))) { |
| 366 | /** |
| 367 | * Let's inform the CLF we're |
| 368 | * powering off the eSE |
| 369 | */ |
| 370 | r = nqx_standby_write(nqx_dev, svdd_off_cmd_warn, |
| 371 | sizeof(svdd_off_cmd_warn)); |
| 372 | if (r < 0) { |
| 373 | dev_err(&nqx_dev->client->dev, |
| 374 | "%s: write failed after max retry\n", |
| 375 | __func__); |
| 376 | return -ENXIO; |
| 377 | } |
| 378 | dev_dbg(&nqx_dev->client->dev, |
| 379 | "%s: svdd_off_cmd_warn sent\n", __func__); |
| 380 | |
| 381 | /* let's power down the eSE */ |
| 382 | gpio_set_value(nqx_dev->ese_gpio, 0); |
| 383 | dev_dbg(&nqx_dev->client->dev, |
| 384 | "%s: nqx_dev->ese_gpio set to 0\n", __func__); |
| 385 | |
| 386 | /** |
| 387 | * Time needed for the SVDD capacitor |
| 388 | * to get discharged |
| 389 | */ |
| 390 | usleep_range(8000, 8100); |
| 391 | |
| 392 | /* Let's inform the CLF the eSE is now off */ |
| 393 | r = nqx_standby_write(nqx_dev, svdd_off_cmd_done, |
| 394 | sizeof(svdd_off_cmd_done)); |
| 395 | if (r < 0) { |
| 396 | dev_err(&nqx_dev->client->dev, |
| 397 | "%s: write failed after max retry\n", |
| 398 | __func__); |
| 399 | return -ENXIO; |
| 400 | } |
| 401 | dev_dbg(&nqx_dev->client->dev, |
| 402 | "%s: svdd_off_cmd_done sent\n", __func__); |
| 403 | } else { |
| 404 | /** |
| 405 | * In case the NFC is off, |
| 406 | * there's no need to send the i2c commands |
| 407 | */ |
| 408 | gpio_set_value(nqx_dev->ese_gpio, 0); |
| 409 | } |
| 410 | |
| 411 | if (!gpio_get_value(nqx_dev->ese_gpio)) { |
| 412 | dev_dbg(&nqx_dev->client->dev, "ese_gpio is disabled\n"); |
| 413 | r = 0; |
| 414 | } |
| 415 | |
| 416 | if (!nqx_dev->nfc_ven_enabled) { |
| 417 | /* hardware dependent delay */ |
| 418 | usleep_range(1000, 1100); |
| 419 | dev_dbg(&nqx_dev->client->dev, "disabling en_gpio\n"); |
| 420 | gpio_set_value(nqx_dev->en_gpio, 0); |
| 421 | } |
| 422 | } else if (arg == 3) { |
| 423 | r = gpio_get_value(nqx_dev->ese_gpio); |
| 424 | } |
| 425 | return r; |
| 426 | } |
| 427 | |
| 428 | static int nfc_open(struct inode *inode, struct file *filp) |
| 429 | { |
| 430 | int ret = 0; |
| 431 | struct nqx_dev *nqx_dev = container_of(filp->private_data, |
| 432 | struct nqx_dev, nqx_device); |
| 433 | |
| 434 | filp->private_data = nqx_dev; |
| 435 | nqx_init_stat(nqx_dev); |
| 436 | |
| 437 | dev_dbg(&nqx_dev->client->dev, |
| 438 | "%s: %d,%d\n", __func__, imajor(inode), iminor(inode)); |
| 439 | return ret; |
| 440 | } |
| 441 | |
| 442 | /* |
| 443 | * nfc_ioctl_power_states() - power control |
| 444 | * @filp: pointer to the file descriptor |
| 445 | * @arg: mode that we want to move to |
| 446 | * |
| 447 | * Device power control. Depending on the arg value, device moves to |
| 448 | * different states |
| 449 | * (arg = 0): NFC_ENABLE GPIO = 0, FW_DL GPIO = 0 |
| 450 | * (arg = 1): NFC_ENABLE GPIO = 1, FW_DL GPIO = 0 |
| 451 | * (arg = 2): FW_DL GPIO = 1 |
| 452 | * |
| 453 | * Return: -ENOIOCTLCMD if arg is not supported, 0 in any other case |
| 454 | */ |
| 455 | int nfc_ioctl_power_states(struct file *filp, unsigned long arg) |
| 456 | { |
| 457 | int r = 0; |
| 458 | struct nqx_dev *nqx_dev = filp->private_data; |
| 459 | |
| 460 | if (arg == 0) { |
| 461 | /* |
| 462 | * We are attempting a hardware reset so let us disable |
| 463 | * interrupts to avoid spurious notifications to upper |
| 464 | * layers. |
| 465 | */ |
| 466 | nqx_disable_irq(nqx_dev); |
| 467 | dev_dbg(&nqx_dev->client->dev, |
| 468 | "gpio_set_value disable: %s: info: %p\n", |
| 469 | __func__, nqx_dev); |
| 470 | if (gpio_is_valid(nqx_dev->firm_gpio)) |
| 471 | gpio_set_value(nqx_dev->firm_gpio, 0); |
| 472 | |
| 473 | if (gpio_is_valid(nqx_dev->ese_gpio)) { |
| 474 | if (!gpio_get_value(nqx_dev->ese_gpio)) { |
| 475 | dev_dbg(&nqx_dev->client->dev, "disabling en_gpio\n"); |
| 476 | gpio_set_value(nqx_dev->en_gpio, 0); |
| 477 | } else { |
| 478 | dev_dbg(&nqx_dev->client->dev, "keeping en_gpio high\n"); |
| 479 | } |
| 480 | } else { |
| 481 | dev_dbg(&nqx_dev->client->dev, "ese_gpio invalid, set en_gpio to low\n"); |
| 482 | gpio_set_value(nqx_dev->en_gpio, 0); |
| 483 | } |
| 484 | r = nqx_clock_deselect(nqx_dev); |
| 485 | if (r < 0) |
| 486 | dev_err(&nqx_dev->client->dev, "unable to disable clock\n"); |
| 487 | nqx_dev->nfc_ven_enabled = false; |
| 488 | /* hardware dependent delay */ |
| 489 | msleep(100); |
| 490 | } else if (arg == 1) { |
| 491 | nqx_enable_irq(nqx_dev); |
| 492 | dev_dbg(&nqx_dev->client->dev, |
| 493 | "gpio_set_value enable: %s: info: %p\n", |
| 494 | __func__, nqx_dev); |
| 495 | if (gpio_is_valid(nqx_dev->firm_gpio)) |
| 496 | gpio_set_value(nqx_dev->firm_gpio, 0); |
| 497 | gpio_set_value(nqx_dev->en_gpio, 1); |
| 498 | r = nqx_clock_select(nqx_dev); |
| 499 | if (r < 0) |
| 500 | dev_err(&nqx_dev->client->dev, "unable to enable clock\n"); |
| 501 | nqx_dev->nfc_ven_enabled = true; |
| 502 | msleep(20); |
| 503 | } else if (arg == 2) { |
| 504 | /* |
| 505 | * We are switching to Dowload Mode, toggle the enable pin |
| 506 | * in order to set the NFCC in the new mode |
| 507 | */ |
| 508 | if (gpio_is_valid(nqx_dev->ese_gpio)) { |
| 509 | if (gpio_get_value(nqx_dev->ese_gpio)) { |
| 510 | dev_err(&nqx_dev->client->dev, |
| 511 | "FW download forbidden while ese is on\n"); |
| 512 | return -EBUSY; /* Device or resource busy */ |
| 513 | } |
| 514 | } |
| 515 | gpio_set_value(nqx_dev->en_gpio, 1); |
| 516 | msleep(20); |
| 517 | if (gpio_is_valid(nqx_dev->firm_gpio)) |
| 518 | gpio_set_value(nqx_dev->firm_gpio, 1); |
| 519 | msleep(20); |
| 520 | gpio_set_value(nqx_dev->en_gpio, 0); |
| 521 | msleep(100); |
| 522 | gpio_set_value(nqx_dev->en_gpio, 1); |
| 523 | msleep(20); |
| 524 | } else { |
| 525 | r = -ENOIOCTLCMD; |
| 526 | } |
| 527 | |
| 528 | return r; |
| 529 | } |
| 530 | |
| 531 | #ifdef CONFIG_COMPAT |
| 532 | static long nfc_compat_ioctl(struct file *pfile, unsigned int cmd, |
| 533 | unsigned long arg) |
| 534 | { |
| 535 | long r = 0; |
| 536 | |
| 537 | arg = (compat_u64)arg; |
| 538 | switch (cmd) { |
| 539 | case NFC_SET_PWR: |
| 540 | nfc_ioctl_power_states(pfile, arg); |
| 541 | break; |
| 542 | case ESE_SET_PWR: |
| 543 | nqx_ese_pwr(pfile->private_data, arg); |
| 544 | break; |
| 545 | case ESE_GET_PWR: |
| 546 | nqx_ese_pwr(pfile->private_data, 3); |
| 547 | break; |
| 548 | case SET_RX_BLOCK: |
| 549 | break; |
| 550 | case SET_EMULATOR_TEST_POINT: |
| 551 | break; |
| 552 | default: |
| 553 | r = -ENOTTY; |
| 554 | } |
| 555 | return r; |
| 556 | } |
| 557 | #endif |
| 558 | |
| 559 | /* |
| 560 | * nfc_ioctl_core_reset_ntf() |
| 561 | * @filp: pointer to the file descriptor |
| 562 | * |
| 563 | * Allows callers to determine if a CORE_RESET_NTF has arrived |
| 564 | * |
| 565 | * Return: the value of variable core_reset_ntf |
| 566 | */ |
| 567 | int nfc_ioctl_core_reset_ntf(struct file *filp) |
| 568 | { |
| 569 | struct nqx_dev *nqx_dev = filp->private_data; |
| 570 | |
| 571 | dev_dbg(&nqx_dev->client->dev, "%s: returning = %d\n", __func__, |
| 572 | nqx_dev->core_reset_ntf); |
| 573 | return nqx_dev->core_reset_ntf; |
| 574 | } |
| 575 | |
| 576 | /* |
| 577 | * Inside nfc_ioctl_nfcc_info |
| 578 | * |
| 579 | * @brief nfc_ioctl_nfcc_info |
| 580 | * |
| 581 | * Check the NQ Chipset and firmware version details |
| 582 | */ |
| 583 | unsigned int nfc_ioctl_nfcc_info(struct file *filp, unsigned long arg) |
| 584 | { |
| 585 | unsigned int r = 0; |
| 586 | struct nqx_dev *nqx_dev = filp->private_data; |
| 587 | |
| 588 | r = nqx_dev->nqx_info.i; |
| 589 | dev_dbg(&nqx_dev->client->dev, |
| 590 | "nqx nfc : nfc_ioctl_nfcc_info r = %d\n", r); |
| 591 | |
| 592 | return r; |
| 593 | } |
| 594 | |
| 595 | static long nfc_ioctl(struct file *pfile, unsigned int cmd, |
| 596 | unsigned long arg) |
| 597 | { |
| 598 | int r = 0; |
| 599 | |
| 600 | switch (cmd) { |
| 601 | case NFC_SET_PWR: |
| 602 | r = nfc_ioctl_power_states(pfile, arg); |
| 603 | break; |
| 604 | case ESE_SET_PWR: |
| 605 | r = nqx_ese_pwr(pfile->private_data, arg); |
| 606 | break; |
| 607 | case ESE_GET_PWR: |
| 608 | r = nqx_ese_pwr(pfile->private_data, 3); |
| 609 | break; |
| 610 | case SET_RX_BLOCK: |
| 611 | break; |
| 612 | case SET_EMULATOR_TEST_POINT: |
| 613 | break; |
| 614 | case NFCC_INITIAL_CORE_RESET_NTF: |
| 615 | r = nfc_ioctl_core_reset_ntf(pfile); |
| 616 | break; |
| 617 | case NFCC_GET_INFO: |
| 618 | r = nfc_ioctl_nfcc_info(pfile, arg); |
| 619 | break; |
| 620 | default: |
| 621 | r = -ENOIOCTLCMD; |
| 622 | } |
| 623 | return r; |
| 624 | } |
| 625 | |
| 626 | static const struct file_operations nfc_dev_fops = { |
| 627 | .owner = THIS_MODULE, |
| 628 | .llseek = no_llseek, |
| 629 | .read = nfc_read, |
| 630 | .write = nfc_write, |
| 631 | .open = nfc_open, |
| 632 | .unlocked_ioctl = nfc_ioctl, |
| 633 | #ifdef CONFIG_COMPAT |
| 634 | .compat_ioctl = nfc_compat_ioctl |
| 635 | #endif |
| 636 | }; |
| 637 | |
| 638 | /* Check for availability of NQ_ NFC controller hardware */ |
| 639 | static int nfcc_hw_check(struct i2c_client *client, struct nqx_dev *nqx_dev) |
| 640 | { |
| 641 | int ret = 0; |
| 642 | |
| 643 | unsigned char raw_nci_reset_cmd[] = {0x20, 0x00, 0x01, 0x00}; |
| 644 | unsigned char raw_nci_init_cmd[] = {0x20, 0x01, 0x00}; |
| 645 | unsigned char nci_init_rsp[28]; |
| 646 | unsigned char nci_reset_rsp[6]; |
| 647 | unsigned char init_rsp_len = 0; |
| 648 | unsigned int enable_gpio = nqx_dev->en_gpio; |
| 649 | /* making sure that the NFCC starts in a clean state. */ |
| 650 | gpio_set_value(enable_gpio, 0);/* ULPM: Disable */ |
| 651 | /* hardware dependent delay */ |
| 652 | msleep(20); |
| 653 | gpio_set_value(enable_gpio, 1);/* HPD : Enable*/ |
| 654 | /* hardware dependent delay */ |
| 655 | msleep(20); |
| 656 | |
| 657 | /* send NCI CORE RESET CMD with Keep Config parameters */ |
| 658 | ret = i2c_master_send(client, raw_nci_reset_cmd, |
| 659 | sizeof(raw_nci_reset_cmd)); |
| 660 | if (ret < 0) { |
| 661 | dev_err(&client->dev, |
| 662 | "%s: - i2c_master_send Error\n", __func__); |
| 663 | goto err_nfcc_hw_check; |
| 664 | } |
| 665 | /* hardware dependent delay */ |
| 666 | msleep(30); |
| 667 | |
| 668 | /* Read Response of RESET command */ |
| 669 | ret = i2c_master_recv(client, nci_reset_rsp, |
| 670 | sizeof(nci_reset_rsp)); |
| 671 | dev_err(&client->dev, |
| 672 | "%s: - nq - reset cmd answer : NfcNciRx %x %x %x\n", |
| 673 | __func__, nci_reset_rsp[0], |
| 674 | nci_reset_rsp[1], nci_reset_rsp[2]); |
| 675 | if (ret < 0) { |
| 676 | dev_err(&client->dev, |
| 677 | "%s: - i2c_master_recv Error\n", __func__); |
| 678 | goto err_nfcc_hw_check; |
| 679 | } |
| 680 | ret = i2c_master_send(client, raw_nci_init_cmd, |
| 681 | sizeof(raw_nci_init_cmd)); |
| 682 | if (ret < 0) { |
| 683 | dev_err(&client->dev, |
| 684 | "%s: - i2c_master_send Error\n", __func__); |
| 685 | goto err_nfcc_hw_check; |
| 686 | } |
| 687 | /* hardware dependent delay */ |
| 688 | msleep(30); |
| 689 | /* Read Response of INIT command */ |
| 690 | ret = i2c_master_recv(client, nci_init_rsp, |
| 691 | sizeof(nci_init_rsp)); |
| 692 | if (ret < 0) { |
| 693 | dev_err(&client->dev, |
| 694 | "%s: - i2c_master_recv Error\n", __func__); |
| 695 | goto err_nfcc_hw_check; |
| 696 | } |
| 697 | init_rsp_len = 2 + nci_init_rsp[2]; /*payload + len*/ |
| 698 | if (init_rsp_len > PAYLOAD_HEADER_LENGTH) { |
| 699 | nqx_dev->nqx_info.info.chip_type = |
| 700 | nci_init_rsp[init_rsp_len - 3]; |
| 701 | nqx_dev->nqx_info.info.rom_version = |
| 702 | nci_init_rsp[init_rsp_len - 2]; |
| 703 | nqx_dev->nqx_info.info.fw_major = |
| 704 | nci_init_rsp[init_rsp_len - 1]; |
| 705 | nqx_dev->nqx_info.info.fw_minor = |
| 706 | nci_init_rsp[init_rsp_len]; |
| 707 | } |
| 708 | dev_dbg(&nqx_dev->client->dev, "NQ NFCC chip_type = %x\n", |
| 709 | nqx_dev->nqx_info.info.chip_type); |
| 710 | dev_dbg(&nqx_dev->client->dev, "NQ fw version = %x.%x.%x\n", |
| 711 | nqx_dev->nqx_info.info.rom_version, |
| 712 | nqx_dev->nqx_info.info.fw_major, |
| 713 | nqx_dev->nqx_info.info.fw_minor); |
| 714 | |
| 715 | switch (nqx_dev->nqx_info.info.chip_type) { |
| 716 | case NFCC_NQ_210: |
| 717 | dev_dbg(&client->dev, |
| 718 | "%s: ## NFCC == NQ210 ##\n", __func__); |
| 719 | break; |
| 720 | case NFCC_NQ_220: |
| 721 | dev_dbg(&client->dev, |
| 722 | "%s: ## NFCC == NQ220 ##\n", __func__); |
| 723 | break; |
| 724 | case NFCC_NQ_310: |
| 725 | dev_dbg(&client->dev, |
| 726 | "%s: ## NFCC == NQ310 ##\n", __func__); |
| 727 | break; |
| 728 | case NFCC_NQ_330: |
| 729 | dev_dbg(&client->dev, |
| 730 | "%s: ## NFCC == NQ330 ##\n", __func__); |
| 731 | break; |
| 732 | case NFCC_PN66T: |
| 733 | dev_dbg(&client->dev, |
| 734 | "%s: ## NFCC == PN66T ##\n", __func__); |
| 735 | break; |
| 736 | default: |
| 737 | dev_err(&client->dev, |
| 738 | "%s: - NFCC HW not Supported\n", __func__); |
| 739 | break; |
| 740 | } |
| 741 | |
| 742 | /*Disable NFC by default to save power on boot*/ |
| 743 | gpio_set_value(enable_gpio, 0);/* ULPM: Disable */ |
| 744 | ret = 0; |
| 745 | goto done; |
| 746 | |
| 747 | err_nfcc_hw_check: |
| 748 | ret = -ENXIO; |
| 749 | dev_err(&client->dev, |
| 750 | "%s: - NFCC HW not available\n", __func__); |
| 751 | done: |
| 752 | return ret; |
| 753 | } |
| 754 | |
| 755 | /* |
| 756 | * Routine to enable clock. |
| 757 | * this routine can be extended to select from multiple |
| 758 | * sources based on clk_src_name. |
| 759 | */ |
| 760 | static int nqx_clock_select(struct nqx_dev *nqx_dev) |
| 761 | { |
| 762 | int r = 0; |
| 763 | |
| 764 | nqx_dev->s_clk = clk_get(&nqx_dev->client->dev, "ref_clk"); |
| 765 | |
| 766 | if (nqx_dev->s_clk == NULL) |
| 767 | goto err_clk; |
| 768 | |
| 769 | if (nqx_dev->clk_run == false) |
| 770 | r = clk_prepare_enable(nqx_dev->s_clk); |
| 771 | |
| 772 | if (r) |
| 773 | goto err_clk; |
| 774 | |
| 775 | nqx_dev->clk_run = true; |
| 776 | |
| 777 | return r; |
| 778 | |
| 779 | err_clk: |
| 780 | r = -1; |
| 781 | return r; |
| 782 | } |
| 783 | |
| 784 | /* |
| 785 | * Routine to disable clocks |
| 786 | */ |
| 787 | static int nqx_clock_deselect(struct nqx_dev *nqx_dev) |
| 788 | { |
| 789 | int r = -1; |
| 790 | |
| 791 | if (nqx_dev->s_clk != NULL) { |
| 792 | if (nqx_dev->clk_run == true) { |
| 793 | clk_disable_unprepare(nqx_dev->s_clk); |
| 794 | nqx_dev->clk_run = false; |
| 795 | } |
| 796 | return 0; |
| 797 | } |
| 798 | return r; |
| 799 | } |
| 800 | |
| 801 | static int nfc_parse_dt(struct device *dev, struct nqx_platform_data *pdata) |
| 802 | { |
| 803 | int r = 0; |
| 804 | struct device_node *np = dev->of_node; |
| 805 | |
| 806 | pdata->en_gpio = of_get_named_gpio(np, "qcom,nq-ven", 0); |
| 807 | if ((!gpio_is_valid(pdata->en_gpio))) |
| 808 | return -EINVAL; |
| 809 | disable_ctrl = pdata->en_gpio; |
| 810 | |
| 811 | pdata->irq_gpio = of_get_named_gpio(np, "qcom,nq-irq", 0); |
| 812 | if ((!gpio_is_valid(pdata->irq_gpio))) |
| 813 | return -EINVAL; |
| 814 | |
| 815 | pdata->firm_gpio = of_get_named_gpio(np, "qcom,nq-firm", 0); |
| 816 | if (!gpio_is_valid(pdata->firm_gpio)) { |
| 817 | dev_warn(dev, |
| 818 | "FIRM GPIO <OPTIONAL> error getting from OF node\n"); |
| 819 | pdata->firm_gpio = -EINVAL; |
| 820 | } |
| 821 | |
| 822 | pdata->ese_gpio = of_get_named_gpio(np, "qcom,nq-esepwr", 0); |
| 823 | if (!gpio_is_valid(pdata->ese_gpio)) { |
| 824 | dev_warn(dev, |
| 825 | "ese GPIO <OPTIONAL> error getting from OF node\n"); |
| 826 | pdata->ese_gpio = -EINVAL; |
| 827 | } |
| 828 | |
| 829 | r = of_property_read_string(np, "qcom,clk-src", &pdata->clk_src_name); |
| 830 | |
| 831 | pdata->clkreq_gpio = of_get_named_gpio(np, "qcom,nq-clkreq", 0); |
| 832 | |
| 833 | if (r) |
| 834 | return -EINVAL; |
| 835 | return r; |
| 836 | } |
| 837 | |
| 838 | static inline int gpio_input_init(const struct device * const dev, |
| 839 | const int gpio, const char * const gpio_name) |
| 840 | { |
| 841 | int r = gpio_request(gpio, gpio_name); |
| 842 | |
| 843 | if (r) { |
| 844 | dev_err(dev, "unable to request gpio [%d]\n", gpio); |
| 845 | return r; |
| 846 | } |
| 847 | |
| 848 | r = gpio_direction_input(gpio); |
| 849 | if (r) |
| 850 | dev_err(dev, "unable to set direction for gpio [%d]\n", gpio); |
| 851 | |
| 852 | return r; |
| 853 | } |
| 854 | |
| 855 | static int nqx_probe(struct i2c_client *client, |
| 856 | const struct i2c_device_id *id) |
| 857 | { |
| 858 | int r = 0; |
| 859 | int irqn = 0; |
| 860 | struct nqx_platform_data *platform_data; |
| 861 | struct nqx_dev *nqx_dev; |
| 862 | |
| 863 | dev_dbg(&client->dev, "%s: enter\n", __func__); |
| 864 | if (client->dev.of_node) { |
| 865 | platform_data = devm_kzalloc(&client->dev, |
| 866 | sizeof(struct nqx_platform_data), GFP_KERNEL); |
| 867 | if (!platform_data) { |
| 868 | r = -ENOMEM; |
| 869 | goto err_platform_data; |
| 870 | } |
| 871 | r = nfc_parse_dt(&client->dev, platform_data); |
| 872 | if (r) |
| 873 | goto err_free_data; |
| 874 | } else |
| 875 | platform_data = client->dev.platform_data; |
| 876 | |
| 877 | dev_dbg(&client->dev, |
| 878 | "%s, inside nfc-nci flags = %x\n", |
| 879 | __func__, client->flags); |
| 880 | |
| 881 | if (platform_data == NULL) { |
| 882 | dev_err(&client->dev, "%s: failed\n", __func__); |
| 883 | r = -ENODEV; |
| 884 | goto err_platform_data; |
| 885 | } |
| 886 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
| 887 | dev_err(&client->dev, "%s: need I2C_FUNC_I2C\n", __func__); |
| 888 | r = -ENODEV; |
| 889 | goto err_free_data; |
| 890 | } |
| 891 | nqx_dev = kzalloc(sizeof(*nqx_dev), GFP_KERNEL); |
| 892 | if (nqx_dev == NULL) { |
| 893 | r = -ENOMEM; |
| 894 | goto err_free_data; |
| 895 | } |
| 896 | nqx_dev->client = client; |
| 897 | nqx_dev->kbuflen = MAX_BUFFER_SIZE; |
| 898 | nqx_dev->kbuf = kzalloc(MAX_BUFFER_SIZE, GFP_KERNEL); |
| 899 | if (!nqx_dev->kbuf) { |
| 900 | dev_err(&client->dev, |
| 901 | "failed to allocate memory for nqx_dev->kbuf\n"); |
| 902 | r = -ENOMEM; |
| 903 | goto err_free_dev; |
| 904 | } |
| 905 | |
| 906 | if (gpio_is_valid(platform_data->en_gpio)) { |
| 907 | r = gpio_request(platform_data->en_gpio, "nfc_reset_gpio"); |
| 908 | if (r) { |
| 909 | dev_err(&client->dev, |
| 910 | "%s: unable to request nfc reset gpio [%d]\n", |
| 911 | __func__, |
| 912 | platform_data->en_gpio); |
| 913 | goto err_mem; |
| 914 | } |
| 915 | r = gpio_direction_output(platform_data->en_gpio, 0); |
| 916 | if (r) { |
| 917 | dev_err(&client->dev, |
| 918 | "%s: unable to set direction for nfc reset gpio [%d]\n", |
| 919 | __func__, |
| 920 | platform_data->en_gpio); |
| 921 | goto err_en_gpio; |
| 922 | } |
| 923 | } else { |
| 924 | dev_err(&client->dev, |
| 925 | "%s: nfc reset gpio not provided\n", __func__); |
| 926 | goto err_mem; |
| 927 | } |
| 928 | |
| 929 | if (gpio_is_valid(platform_data->irq_gpio)) { |
| 930 | r = gpio_request(platform_data->irq_gpio, "nfc_irq_gpio"); |
| 931 | if (r) { |
| 932 | dev_err(&client->dev, "%s: unable to request nfc irq gpio [%d]\n", |
| 933 | __func__, platform_data->irq_gpio); |
| 934 | goto err_en_gpio; |
| 935 | } |
| 936 | r = gpio_direction_input(platform_data->irq_gpio); |
| 937 | if (r) { |
| 938 | dev_err(&client->dev, |
| 939 | "%s: unable to set direction for nfc irq gpio [%d]\n", |
| 940 | __func__, |
| 941 | platform_data->irq_gpio); |
| 942 | goto err_irq_gpio; |
| 943 | } |
| 944 | irqn = gpio_to_irq(platform_data->irq_gpio); |
| 945 | if (irqn < 0) { |
| 946 | r = irqn; |
| 947 | goto err_irq_gpio; |
| 948 | } |
| 949 | client->irq = irqn; |
| 950 | } else { |
| 951 | dev_err(&client->dev, "%s: irq gpio not provided\n", __func__); |
| 952 | goto err_en_gpio; |
| 953 | } |
| 954 | if (gpio_is_valid(platform_data->firm_gpio)) { |
| 955 | r = gpio_request(platform_data->firm_gpio, |
| 956 | "nfc_firm_gpio"); |
| 957 | if (r) { |
| 958 | dev_err(&client->dev, |
| 959 | "%s: unable to request nfc firmware gpio [%d]\n", |
| 960 | __func__, platform_data->firm_gpio); |
| 961 | goto err_irq_gpio; |
| 962 | } |
| 963 | r = gpio_direction_output(platform_data->firm_gpio, 0); |
| 964 | if (r) { |
| 965 | dev_err(&client->dev, |
| 966 | "%s: cannot set direction for nfc firmware gpio [%d]\n", |
| 967 | __func__, platform_data->firm_gpio); |
| 968 | goto err_firm_gpio; |
| 969 | } |
| 970 | } else { |
| 971 | dev_err(&client->dev, |
| 972 | "%s: firm gpio not provided\n", __func__); |
| 973 | goto err_irq_gpio; |
| 974 | } |
| 975 | if (gpio_is_valid(platform_data->ese_gpio)) { |
| 976 | r = gpio_request(platform_data->ese_gpio, |
| 977 | "nfc-ese_pwr"); |
| 978 | if (r) { |
| 979 | nqx_dev->ese_gpio = -EINVAL; |
| 980 | dev_err(&client->dev, |
| 981 | "%s: unable to request nfc ese gpio [%d]\n", |
| 982 | __func__, platform_data->ese_gpio); |
| 983 | /* ese gpio optional so we should continue */ |
| 984 | } else { |
| 985 | nqx_dev->ese_gpio = platform_data->ese_gpio; |
| 986 | r = gpio_direction_output(platform_data->ese_gpio, 0); |
| 987 | if (r) { |
| 988 | /* |
| 989 | * free ese gpio and set invalid |
| 990 | * to avoid further use |
| 991 | */ |
| 992 | gpio_free(platform_data->ese_gpio); |
| 993 | nqx_dev->ese_gpio = -EINVAL; |
| 994 | dev_err(&client->dev, |
| 995 | "%s: cannot set direction for nfc ese gpio [%d]\n", |
| 996 | __func__, platform_data->ese_gpio); |
| 997 | /* ese gpio optional so we should continue */ |
| 998 | } |
| 999 | } |
| 1000 | } else { |
| 1001 | nqx_dev->ese_gpio = -EINVAL; |
| 1002 | dev_err(&client->dev, |
| 1003 | "%s: ese gpio not provided\n", __func__); |
| 1004 | /* ese gpio optional so we should continue */ |
| 1005 | } |
| 1006 | if (gpio_is_valid(platform_data->clkreq_gpio)) { |
| 1007 | r = gpio_request(platform_data->clkreq_gpio, |
| 1008 | "nfc_clkreq_gpio"); |
| 1009 | if (r) { |
| 1010 | dev_err(&client->dev, |
| 1011 | "%s: unable to request nfc clkreq gpio [%d]\n", |
| 1012 | __func__, platform_data->clkreq_gpio); |
| 1013 | goto err_ese_gpio; |
| 1014 | } |
| 1015 | r = gpio_direction_input(platform_data->clkreq_gpio); |
| 1016 | if (r) { |
| 1017 | dev_err(&client->dev, |
| 1018 | "%s: cannot set direction for nfc clkreq gpio [%d]\n", |
| 1019 | __func__, platform_data->clkreq_gpio); |
| 1020 | goto err_clkreq_gpio; |
| 1021 | } |
| 1022 | } else { |
| 1023 | dev_err(&client->dev, |
| 1024 | "%s: clkreq gpio not provided\n", __func__); |
| 1025 | goto err_ese_gpio; |
| 1026 | } |
| 1027 | |
| 1028 | nqx_dev->en_gpio = platform_data->en_gpio; |
| 1029 | nqx_dev->irq_gpio = platform_data->irq_gpio; |
| 1030 | nqx_dev->firm_gpio = platform_data->firm_gpio; |
| 1031 | nqx_dev->clkreq_gpio = platform_data->clkreq_gpio; |
| 1032 | nqx_dev->pdata = platform_data; |
| 1033 | |
| 1034 | /* init mutex and queues */ |
| 1035 | init_waitqueue_head(&nqx_dev->read_wq); |
| 1036 | mutex_init(&nqx_dev->read_mutex); |
| 1037 | spin_lock_init(&nqx_dev->irq_enabled_lock); |
| 1038 | |
| 1039 | nqx_dev->nqx_device.minor = MISC_DYNAMIC_MINOR; |
| 1040 | nqx_dev->nqx_device.name = "nq-nci"; |
| 1041 | nqx_dev->nqx_device.fops = &nfc_dev_fops; |
| 1042 | |
| 1043 | r = misc_register(&nqx_dev->nqx_device); |
| 1044 | if (r) { |
| 1045 | dev_err(&client->dev, "%s: misc_register failed\n", __func__); |
| 1046 | goto err_misc_register; |
| 1047 | } |
| 1048 | |
| 1049 | /* NFC_INT IRQ */ |
| 1050 | nqx_dev->irq_enabled = true; |
| 1051 | r = request_irq(client->irq, nqx_dev_irq_handler, |
| 1052 | IRQF_TRIGGER_HIGH, client->name, nqx_dev); |
| 1053 | if (r) { |
| 1054 | dev_err(&client->dev, "%s: request_irq failed\n", __func__); |
| 1055 | goto err_request_irq_failed; |
| 1056 | } |
| 1057 | nqx_disable_irq(nqx_dev); |
| 1058 | |
| 1059 | /* |
| 1060 | * To be efficient we need to test whether nfcc hardware is physically |
| 1061 | * present before attempting further hardware initialisation. |
| 1062 | * |
| 1063 | */ |
| 1064 | r = nfcc_hw_check(client, nqx_dev); |
| 1065 | if (r) { |
| 1066 | /* make sure NFCC is not enabled */ |
| 1067 | gpio_set_value(platform_data->en_gpio, 0); |
| 1068 | /* We don't think there is hardware switch NFC OFF */ |
| 1069 | goto err_request_hw_check_failed; |
| 1070 | } |
| 1071 | |
| 1072 | /* Register reboot notifier here */ |
| 1073 | r = register_reboot_notifier(&nfcc_notifier); |
| 1074 | if (r) { |
| 1075 | dev_err(&client->dev, |
| 1076 | "%s: cannot register reboot notifier(err = %d)\n", |
| 1077 | __func__, r); |
| 1078 | /* |
| 1079 | * nfcc_hw_check function not doing memory |
| 1080 | * allocation so using same goto target here |
| 1081 | */ |
| 1082 | goto err_request_hw_check_failed; |
| 1083 | } |
| 1084 | |
| 1085 | #ifdef NFC_KERNEL_BU |
| 1086 | r = nqx_clock_select(nqx_dev); |
| 1087 | if (r < 0) { |
| 1088 | dev_err(&client->dev, |
| 1089 | "%s: nqx_clock_select failed\n", __func__); |
| 1090 | goto err_clock_en_failed; |
| 1091 | } |
| 1092 | gpio_set_value(platform_data->en_gpio, 1); |
| 1093 | #endif |
| 1094 | device_init_wakeup(&client->dev, true); |
| 1095 | device_set_wakeup_capable(&client->dev, true); |
| 1096 | i2c_set_clientdata(client, nqx_dev); |
| 1097 | nqx_dev->irq_wake_up = false; |
| 1098 | |
| 1099 | dev_err(&client->dev, |
| 1100 | "%s: probing NFCC NQxxx exited successfully\n", |
| 1101 | __func__); |
| 1102 | return 0; |
| 1103 | |
| 1104 | #ifdef NFC_KERNEL_BU |
| 1105 | err_clock_en_failed: |
| 1106 | unregister_reboot_notifier(&nfcc_notifier); |
| 1107 | #endif |
| 1108 | err_request_hw_check_failed: |
| 1109 | free_irq(client->irq, nqx_dev); |
| 1110 | err_request_irq_failed: |
| 1111 | misc_deregister(&nqx_dev->nqx_device); |
| 1112 | err_misc_register: |
| 1113 | mutex_destroy(&nqx_dev->read_mutex); |
| 1114 | err_clkreq_gpio: |
| 1115 | gpio_free(platform_data->clkreq_gpio); |
| 1116 | err_ese_gpio: |
| 1117 | /* optional gpio, not sure was configured in probe */ |
| 1118 | if (nqx_dev->ese_gpio > 0) |
| 1119 | gpio_free(platform_data->ese_gpio); |
| 1120 | err_firm_gpio: |
| 1121 | gpio_free(platform_data->firm_gpio); |
| 1122 | err_irq_gpio: |
| 1123 | gpio_free(platform_data->irq_gpio); |
| 1124 | err_en_gpio: |
| 1125 | gpio_free(platform_data->en_gpio); |
| 1126 | err_mem: |
| 1127 | kfree(nqx_dev->kbuf); |
| 1128 | err_free_dev: |
| 1129 | kfree(nqx_dev); |
| 1130 | err_free_data: |
| 1131 | if (client->dev.of_node) |
| 1132 | devm_kfree(&client->dev, platform_data); |
| 1133 | err_platform_data: |
| 1134 | dev_err(&client->dev, |
| 1135 | "%s: probing nqxx failed, check hardware\n", |
| 1136 | __func__); |
| 1137 | return r; |
| 1138 | } |
| 1139 | |
| 1140 | static int nqx_remove(struct i2c_client *client) |
| 1141 | { |
| 1142 | int ret = 0; |
| 1143 | struct nqx_dev *nqx_dev; |
| 1144 | |
| 1145 | nqx_dev = i2c_get_clientdata(client); |
| 1146 | if (!nqx_dev) { |
| 1147 | dev_err(&client->dev, |
| 1148 | "%s: device doesn't exist anymore\n", __func__); |
| 1149 | ret = -ENODEV; |
| 1150 | goto err; |
| 1151 | } |
| 1152 | |
| 1153 | unregister_reboot_notifier(&nfcc_notifier); |
| 1154 | free_irq(client->irq, nqx_dev); |
| 1155 | misc_deregister(&nqx_dev->nqx_device); |
| 1156 | mutex_destroy(&nqx_dev->read_mutex); |
| 1157 | gpio_free(nqx_dev->clkreq_gpio); |
| 1158 | /* optional gpio, not sure was configured in probe */ |
| 1159 | if (nqx_dev->ese_gpio > 0) |
| 1160 | gpio_free(nqx_dev->ese_gpio); |
| 1161 | gpio_free(nqx_dev->firm_gpio); |
| 1162 | gpio_free(nqx_dev->irq_gpio); |
| 1163 | gpio_free(nqx_dev->en_gpio); |
| 1164 | kfree(nqx_dev->kbuf); |
| 1165 | if (client->dev.of_node) |
| 1166 | devm_kfree(&client->dev, nqx_dev->pdata); |
| 1167 | |
| 1168 | kfree(nqx_dev); |
| 1169 | err: |
| 1170 | return ret; |
| 1171 | } |
| 1172 | |
| 1173 | static int nqx_suspend(struct device *device) |
| 1174 | { |
| 1175 | struct i2c_client *client = to_i2c_client(device); |
| 1176 | struct nqx_dev *nqx_dev = i2c_get_clientdata(client); |
| 1177 | |
| 1178 | if (device_may_wakeup(&client->dev) && nqx_dev->irq_enabled) { |
| 1179 | if (!enable_irq_wake(client->irq)) |
| 1180 | nqx_dev->irq_wake_up = true; |
| 1181 | } |
| 1182 | return 0; |
| 1183 | } |
| 1184 | |
| 1185 | static int nqx_resume(struct device *device) |
| 1186 | { |
| 1187 | struct i2c_client *client = to_i2c_client(device); |
| 1188 | struct nqx_dev *nqx_dev = i2c_get_clientdata(client); |
| 1189 | |
| 1190 | if (device_may_wakeup(&client->dev) && nqx_dev->irq_wake_up) { |
| 1191 | if (!disable_irq_wake(client->irq)) |
| 1192 | nqx_dev->irq_wake_up = false; |
| 1193 | } |
| 1194 | return 0; |
| 1195 | } |
| 1196 | |
| 1197 | static const struct i2c_device_id nqx_id[] = { |
| 1198 | {"nqx-i2c", 0}, |
| 1199 | {} |
| 1200 | }; |
| 1201 | |
| 1202 | static const struct dev_pm_ops nfc_pm_ops = { |
| 1203 | SET_SYSTEM_SLEEP_PM_OPS(nqx_suspend, nqx_resume) |
| 1204 | }; |
| 1205 | |
| 1206 | static struct i2c_driver nqx = { |
| 1207 | .id_table = nqx_id, |
| 1208 | .probe = nqx_probe, |
| 1209 | .remove = nqx_remove, |
| 1210 | .driver = { |
| 1211 | .owner = THIS_MODULE, |
| 1212 | .name = "nq-nci", |
| 1213 | .of_match_table = msm_match_table, |
| 1214 | .pm = &nfc_pm_ops, |
| 1215 | }, |
| 1216 | }; |
| 1217 | |
| 1218 | static int nfcc_reboot(struct notifier_block *notifier, unsigned long val, |
| 1219 | void *v) |
| 1220 | { |
| 1221 | gpio_set_value(disable_ctrl, 1); |
| 1222 | return NOTIFY_OK; |
| 1223 | } |
| 1224 | |
| 1225 | /* |
| 1226 | * module load/unload record keeping |
| 1227 | */ |
| 1228 | static int __init nqx_dev_init(void) |
| 1229 | { |
| 1230 | return i2c_add_driver(&nqx); |
| 1231 | } |
| 1232 | module_init(nqx_dev_init); |
| 1233 | |
| 1234 | static void __exit nqx_dev_exit(void) |
| 1235 | { |
| 1236 | unregister_reboot_notifier(&nfcc_notifier); |
| 1237 | i2c_del_driver(&nqx); |
| 1238 | } |
| 1239 | module_exit(nqx_dev_exit); |
| 1240 | |
| 1241 | MODULE_DESCRIPTION("NFC nqx"); |
| 1242 | MODULE_LICENSE("GPL v2"); |