Tapas Dey | b5e6960 | 2019-05-07 11:33:00 +0530 | [diff] [blame] | 1 | /* Copyright (c) 2015-2019, The Linux Foundation. All rights reserved. |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 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; |
Gaurav Singhal | 7166110 | 2018-01-30 16:34:37 +0530 | [diff] [blame] | 39 | /* NFC_CLK pin voting state */ |
| 40 | bool clk_pin_voting; |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 41 | }; |
| 42 | |
| 43 | static const struct of_device_id msm_match_table[] = { |
| 44 | {.compatible = "qcom,nq-nci"}, |
| 45 | {} |
| 46 | }; |
| 47 | |
| 48 | MODULE_DEVICE_TABLE(of, msm_match_table); |
| 49 | |
| 50 | #define MAX_BUFFER_SIZE (320) |
| 51 | #define WAKEUP_SRC_TIMEOUT (2000) |
| 52 | #define MAX_RETRY_COUNT 3 |
| 53 | |
| 54 | struct nqx_dev { |
| 55 | wait_queue_head_t read_wq; |
| 56 | struct mutex read_mutex; |
| 57 | struct i2c_client *client; |
| 58 | struct miscdevice nqx_device; |
| 59 | union nqx_uinfo nqx_info; |
| 60 | /* NFC GPIO variables */ |
| 61 | unsigned int irq_gpio; |
| 62 | unsigned int en_gpio; |
| 63 | unsigned int firm_gpio; |
| 64 | unsigned int clkreq_gpio; |
| 65 | unsigned int ese_gpio; |
| 66 | /* NFC VEN pin state powered by Nfc */ |
| 67 | bool nfc_ven_enabled; |
| 68 | /* NFC_IRQ state */ |
| 69 | bool irq_enabled; |
| 70 | /* NFC_IRQ wake-up state */ |
| 71 | bool irq_wake_up; |
| 72 | spinlock_t irq_enabled_lock; |
| 73 | unsigned int count_irq; |
| 74 | /* Initial CORE RESET notification */ |
| 75 | unsigned int core_reset_ntf; |
| 76 | /* CLK control */ |
| 77 | bool clk_run; |
| 78 | struct clk *s_clk; |
| 79 | /* read buffer*/ |
| 80 | size_t kbuflen; |
| 81 | u8 *kbuf; |
| 82 | struct nqx_platform_data *pdata; |
| 83 | }; |
| 84 | |
| 85 | static int nfcc_reboot(struct notifier_block *notifier, unsigned long val, |
| 86 | void *v); |
| 87 | /*clock enable function*/ |
| 88 | static int nqx_clock_select(struct nqx_dev *nqx_dev); |
| 89 | /*clock disable function*/ |
| 90 | static int nqx_clock_deselect(struct nqx_dev *nqx_dev); |
| 91 | static struct notifier_block nfcc_notifier = { |
| 92 | .notifier_call = nfcc_reboot, |
| 93 | .next = NULL, |
| 94 | .priority = 0 |
| 95 | }; |
| 96 | |
| 97 | unsigned int disable_ctrl; |
| 98 | |
| 99 | static void nqx_init_stat(struct nqx_dev *nqx_dev) |
| 100 | { |
| 101 | nqx_dev->count_irq = 0; |
| 102 | } |
| 103 | |
| 104 | static void nqx_disable_irq(struct nqx_dev *nqx_dev) |
| 105 | { |
| 106 | unsigned long flags; |
| 107 | |
| 108 | spin_lock_irqsave(&nqx_dev->irq_enabled_lock, flags); |
| 109 | if (nqx_dev->irq_enabled) { |
| 110 | disable_irq_nosync(nqx_dev->client->irq); |
| 111 | nqx_dev->irq_enabled = false; |
| 112 | } |
| 113 | spin_unlock_irqrestore(&nqx_dev->irq_enabled_lock, flags); |
| 114 | } |
| 115 | |
| 116 | /** |
| 117 | * nqx_enable_irq() |
| 118 | * |
| 119 | * Check if interrupt is enabled or not |
| 120 | * and enable interrupt |
| 121 | * |
| 122 | * Return: void |
| 123 | */ |
| 124 | static void nqx_enable_irq(struct nqx_dev *nqx_dev) |
| 125 | { |
| 126 | unsigned long flags; |
| 127 | |
| 128 | spin_lock_irqsave(&nqx_dev->irq_enabled_lock, flags); |
| 129 | if (!nqx_dev->irq_enabled) { |
| 130 | nqx_dev->irq_enabled = true; |
| 131 | enable_irq(nqx_dev->client->irq); |
| 132 | } |
| 133 | spin_unlock_irqrestore(&nqx_dev->irq_enabled_lock, flags); |
| 134 | } |
| 135 | |
| 136 | static irqreturn_t nqx_dev_irq_handler(int irq, void *dev_id) |
| 137 | { |
| 138 | struct nqx_dev *nqx_dev = dev_id; |
| 139 | unsigned long flags; |
| 140 | |
| 141 | if (device_may_wakeup(&nqx_dev->client->dev)) |
| 142 | pm_wakeup_event(&nqx_dev->client->dev, WAKEUP_SRC_TIMEOUT); |
| 143 | |
| 144 | nqx_disable_irq(nqx_dev); |
| 145 | spin_lock_irqsave(&nqx_dev->irq_enabled_lock, flags); |
| 146 | nqx_dev->count_irq++; |
| 147 | spin_unlock_irqrestore(&nqx_dev->irq_enabled_lock, flags); |
| 148 | wake_up(&nqx_dev->read_wq); |
| 149 | |
| 150 | return IRQ_HANDLED; |
| 151 | } |
| 152 | |
Bhuvan Varshney | 8e2ca88 | 2019-09-09 19:20:37 +0530 | [diff] [blame] | 153 | static int is_data_available_for_read(struct nqx_dev *nqx_dev) |
| 154 | { |
| 155 | int ret; |
| 156 | |
| 157 | nqx_enable_irq(nqx_dev); |
| 158 | ret = wait_event_interruptible(nqx_dev->read_wq, !nqx_dev->irq_enabled); |
| 159 | return ret; |
| 160 | } |
| 161 | |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 162 | static ssize_t nfc_read(struct file *filp, char __user *buf, |
| 163 | size_t count, loff_t *offset) |
| 164 | { |
| 165 | struct nqx_dev *nqx_dev = filp->private_data; |
| 166 | unsigned char *tmp = NULL; |
| 167 | int ret; |
| 168 | int irq_gpio_val = 0; |
| 169 | |
| 170 | if (!nqx_dev) { |
| 171 | ret = -ENODEV; |
| 172 | goto out; |
| 173 | } |
| 174 | |
| 175 | if (count > nqx_dev->kbuflen) |
| 176 | count = nqx_dev->kbuflen; |
| 177 | |
| 178 | dev_dbg(&nqx_dev->client->dev, "%s : reading %zu bytes.\n", |
| 179 | __func__, count); |
| 180 | |
| 181 | mutex_lock(&nqx_dev->read_mutex); |
| 182 | |
| 183 | irq_gpio_val = gpio_get_value(nqx_dev->irq_gpio); |
| 184 | if (irq_gpio_val == 0) { |
| 185 | if (filp->f_flags & O_NONBLOCK) { |
| 186 | dev_err(&nqx_dev->client->dev, |
| 187 | ":f_falg has O_NONBLOCK. EAGAIN\n"); |
| 188 | ret = -EAGAIN; |
| 189 | goto err; |
| 190 | } |
| 191 | while (1) { |
| 192 | ret = 0; |
| 193 | if (!nqx_dev->irq_enabled) { |
| 194 | nqx_dev->irq_enabled = true; |
| 195 | enable_irq(nqx_dev->client->irq); |
| 196 | } |
| 197 | if (!gpio_get_value(nqx_dev->irq_gpio)) { |
| 198 | ret = wait_event_interruptible(nqx_dev->read_wq, |
| 199 | !nqx_dev->irq_enabled); |
| 200 | } |
| 201 | if (ret) |
| 202 | goto err; |
| 203 | nqx_disable_irq(nqx_dev); |
| 204 | |
| 205 | if (gpio_get_value(nqx_dev->irq_gpio)) |
| 206 | break; |
| 207 | dev_err_ratelimited(&nqx_dev->client->dev, |
| 208 | "gpio is low, no need to read data\n"); |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | tmp = nqx_dev->kbuf; |
| 213 | if (!tmp) { |
| 214 | dev_err(&nqx_dev->client->dev, |
| 215 | "%s: device doesn't exist anymore\n", __func__); |
| 216 | ret = -ENODEV; |
| 217 | goto err; |
| 218 | } |
| 219 | memset(tmp, 0x00, count); |
| 220 | |
| 221 | /* Read data */ |
| 222 | ret = i2c_master_recv(nqx_dev->client, tmp, count); |
| 223 | if (ret < 0) { |
| 224 | dev_err(&nqx_dev->client->dev, |
| 225 | "%s: i2c_master_recv returned %d\n", __func__, ret); |
| 226 | goto err; |
| 227 | } |
| 228 | if (ret > count) { |
| 229 | dev_err(&nqx_dev->client->dev, |
| 230 | "%s: received too many bytes from i2c (%d)\n", |
| 231 | __func__, ret); |
| 232 | ret = -EIO; |
| 233 | goto err; |
| 234 | } |
| 235 | #ifdef NFC_KERNEL_BU |
| 236 | dev_dbg(&nqx_dev->client->dev, "%s : NfcNciRx %x %x %x\n", |
| 237 | __func__, tmp[0], tmp[1], tmp[2]); |
| 238 | #endif |
| 239 | if (copy_to_user(buf, tmp, ret)) { |
| 240 | dev_warn(&nqx_dev->client->dev, |
| 241 | "%s : failed to copy to user space\n", __func__); |
| 242 | ret = -EFAULT; |
| 243 | goto err; |
| 244 | } |
| 245 | mutex_unlock(&nqx_dev->read_mutex); |
| 246 | return ret; |
| 247 | |
| 248 | err: |
| 249 | mutex_unlock(&nqx_dev->read_mutex); |
| 250 | out: |
| 251 | return ret; |
| 252 | } |
| 253 | |
| 254 | static ssize_t nfc_write(struct file *filp, const char __user *buf, |
| 255 | size_t count, loff_t *offset) |
| 256 | { |
| 257 | struct nqx_dev *nqx_dev = filp->private_data; |
| 258 | char *tmp = NULL; |
| 259 | int ret = 0; |
| 260 | |
| 261 | if (!nqx_dev) { |
| 262 | ret = -ENODEV; |
| 263 | goto out; |
| 264 | } |
| 265 | if (count > nqx_dev->kbuflen) { |
| 266 | dev_err(&nqx_dev->client->dev, "%s: out of memory\n", |
| 267 | __func__); |
| 268 | ret = -ENOMEM; |
| 269 | goto out; |
| 270 | } |
| 271 | |
| 272 | tmp = memdup_user(buf, count); |
| 273 | if (IS_ERR(tmp)) { |
| 274 | dev_err(&nqx_dev->client->dev, "%s: memdup_user failed\n", |
| 275 | __func__); |
| 276 | ret = PTR_ERR(tmp); |
| 277 | goto out; |
| 278 | } |
| 279 | |
| 280 | ret = i2c_master_send(nqx_dev->client, tmp, count); |
| 281 | if (ret != count) { |
| 282 | dev_err(&nqx_dev->client->dev, |
| 283 | "%s: failed to write %d\n", __func__, ret); |
| 284 | ret = -EIO; |
| 285 | goto out_free; |
| 286 | } |
| 287 | #ifdef NFC_KERNEL_BU |
| 288 | dev_dbg(&nqx_dev->client->dev, |
| 289 | "%s : i2c-%d: NfcNciTx %x %x %x\n", |
| 290 | __func__, iminor(file_inode(filp)), |
| 291 | tmp[0], tmp[1], tmp[2]); |
| 292 | #endif |
| 293 | usleep_range(1000, 1100); |
| 294 | out_free: |
| 295 | kfree(tmp); |
| 296 | out: |
| 297 | return ret; |
| 298 | } |
| 299 | |
| 300 | /** |
| 301 | * nqx_standby_write() |
| 302 | * @buf: pointer to data buffer |
| 303 | * @len: # of bytes need to transfer |
| 304 | * |
| 305 | * write data buffer over I2C and retry |
| 306 | * if NFCC is in stand by mode |
| 307 | * |
| 308 | * Return: # of bytes written or -ve value in case of error |
| 309 | */ |
| 310 | static int nqx_standby_write(struct nqx_dev *nqx_dev, |
| 311 | const unsigned char *buf, size_t len) |
| 312 | { |
| 313 | int ret = -EINVAL; |
| 314 | int retry_cnt; |
| 315 | |
| 316 | for (retry_cnt = 1; retry_cnt <= MAX_RETRY_COUNT; retry_cnt++) { |
| 317 | ret = i2c_master_send(nqx_dev->client, buf, len); |
| 318 | if (ret < 0) { |
| 319 | dev_err(&nqx_dev->client->dev, |
| 320 | "%s: write failed, Maybe in Standby Mode - Retry(%d)\n", |
| 321 | __func__, retry_cnt); |
| 322 | usleep_range(1000, 1100); |
| 323 | } else if (ret == len) |
| 324 | break; |
| 325 | } |
| 326 | return ret; |
| 327 | } |
| 328 | |
| 329 | /* |
| 330 | * Power management of the eSE |
| 331 | * NFC & eSE ON : NFC_EN high and eSE_pwr_req high. |
| 332 | * NFC OFF & eSE ON : NFC_EN high and eSE_pwr_req high. |
| 333 | * NFC OFF & eSE OFF : NFC_EN low and eSE_pwr_req low. |
| 334 | */ |
| 335 | static int nqx_ese_pwr(struct nqx_dev *nqx_dev, unsigned long int arg) |
| 336 | { |
| 337 | int r = -1; |
| 338 | const unsigned char svdd_off_cmd_warn[] = {0x2F, 0x31, 0x01, 0x01}; |
| 339 | const unsigned char svdd_off_cmd_done[] = {0x2F, 0x31, 0x01, 0x00}; |
| 340 | |
| 341 | if (!gpio_is_valid(nqx_dev->ese_gpio)) { |
| 342 | dev_err(&nqx_dev->client->dev, |
| 343 | "%s: ese_gpio is not valid\n", __func__); |
| 344 | return -EINVAL; |
| 345 | } |
| 346 | |
| 347 | if (arg == 0) { |
| 348 | /* |
| 349 | * We want to power on the eSE and to do so we need the |
| 350 | * eSE_pwr_req pin and the NFC_EN pin to be high |
| 351 | */ |
| 352 | if (gpio_get_value(nqx_dev->ese_gpio)) { |
| 353 | dev_dbg(&nqx_dev->client->dev, "ese_gpio is already high\n"); |
| 354 | r = 0; |
| 355 | } else { |
| 356 | /** |
| 357 | * Let's store the NFC_EN pin state |
| 358 | * only if the eSE is not yet on |
| 359 | */ |
| 360 | nqx_dev->nfc_ven_enabled = |
| 361 | gpio_get_value(nqx_dev->en_gpio); |
| 362 | if (!nqx_dev->nfc_ven_enabled) { |
| 363 | gpio_set_value(nqx_dev->en_gpio, 1); |
| 364 | /* hardware dependent delay */ |
| 365 | usleep_range(1000, 1100); |
| 366 | } |
| 367 | gpio_set_value(nqx_dev->ese_gpio, 1); |
Gaurav Singhal | cfb6480 | 2017-08-30 17:03:58 +0530 | [diff] [blame] | 368 | usleep_range(1000, 1100); |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 369 | if (gpio_get_value(nqx_dev->ese_gpio)) { |
| 370 | dev_dbg(&nqx_dev->client->dev, "ese_gpio is enabled\n"); |
| 371 | r = 0; |
| 372 | } |
| 373 | } |
| 374 | } else if (arg == 1) { |
| 375 | if (nqx_dev->nfc_ven_enabled && |
| 376 | ((nqx_dev->nqx_info.info.chip_type == NFCC_NQ_220) || |
| 377 | (nqx_dev->nqx_info.info.chip_type == NFCC_PN66T))) { |
| 378 | /** |
| 379 | * Let's inform the CLF we're |
| 380 | * powering off the eSE |
| 381 | */ |
| 382 | r = nqx_standby_write(nqx_dev, svdd_off_cmd_warn, |
| 383 | sizeof(svdd_off_cmd_warn)); |
| 384 | if (r < 0) { |
| 385 | dev_err(&nqx_dev->client->dev, |
| 386 | "%s: write failed after max retry\n", |
| 387 | __func__); |
| 388 | return -ENXIO; |
| 389 | } |
| 390 | dev_dbg(&nqx_dev->client->dev, |
| 391 | "%s: svdd_off_cmd_warn sent\n", __func__); |
| 392 | |
| 393 | /* let's power down the eSE */ |
| 394 | gpio_set_value(nqx_dev->ese_gpio, 0); |
| 395 | dev_dbg(&nqx_dev->client->dev, |
| 396 | "%s: nqx_dev->ese_gpio set to 0\n", __func__); |
| 397 | |
| 398 | /** |
| 399 | * Time needed for the SVDD capacitor |
| 400 | * to get discharged |
| 401 | */ |
| 402 | usleep_range(8000, 8100); |
| 403 | |
| 404 | /* Let's inform the CLF the eSE is now off */ |
| 405 | r = nqx_standby_write(nqx_dev, svdd_off_cmd_done, |
| 406 | sizeof(svdd_off_cmd_done)); |
| 407 | if (r < 0) { |
| 408 | dev_err(&nqx_dev->client->dev, |
| 409 | "%s: write failed after max retry\n", |
| 410 | __func__); |
| 411 | return -ENXIO; |
| 412 | } |
| 413 | dev_dbg(&nqx_dev->client->dev, |
| 414 | "%s: svdd_off_cmd_done sent\n", __func__); |
| 415 | } else { |
| 416 | /** |
| 417 | * In case the NFC is off, |
| 418 | * there's no need to send the i2c commands |
| 419 | */ |
| 420 | gpio_set_value(nqx_dev->ese_gpio, 0); |
Gaurav Singhal | cfb6480 | 2017-08-30 17:03:58 +0530 | [diff] [blame] | 421 | usleep_range(1000, 1100); |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 422 | } |
| 423 | |
| 424 | if (!gpio_get_value(nqx_dev->ese_gpio)) { |
| 425 | dev_dbg(&nqx_dev->client->dev, "ese_gpio is disabled\n"); |
| 426 | r = 0; |
| 427 | } |
| 428 | |
| 429 | if (!nqx_dev->nfc_ven_enabled) { |
| 430 | /* hardware dependent delay */ |
| 431 | usleep_range(1000, 1100); |
| 432 | dev_dbg(&nqx_dev->client->dev, "disabling en_gpio\n"); |
| 433 | gpio_set_value(nqx_dev->en_gpio, 0); |
| 434 | } |
| 435 | } else if (arg == 3) { |
| 436 | r = gpio_get_value(nqx_dev->ese_gpio); |
| 437 | } |
| 438 | return r; |
| 439 | } |
| 440 | |
| 441 | static int nfc_open(struct inode *inode, struct file *filp) |
| 442 | { |
| 443 | int ret = 0; |
| 444 | struct nqx_dev *nqx_dev = container_of(filp->private_data, |
| 445 | struct nqx_dev, nqx_device); |
| 446 | |
| 447 | filp->private_data = nqx_dev; |
| 448 | nqx_init_stat(nqx_dev); |
| 449 | |
| 450 | dev_dbg(&nqx_dev->client->dev, |
| 451 | "%s: %d,%d\n", __func__, imajor(inode), iminor(inode)); |
| 452 | return ret; |
| 453 | } |
| 454 | |
| 455 | /* |
| 456 | * nfc_ioctl_power_states() - power control |
| 457 | * @filp: pointer to the file descriptor |
| 458 | * @arg: mode that we want to move to |
| 459 | * |
| 460 | * Device power control. Depending on the arg value, device moves to |
| 461 | * different states |
| 462 | * (arg = 0): NFC_ENABLE GPIO = 0, FW_DL GPIO = 0 |
| 463 | * (arg = 1): NFC_ENABLE GPIO = 1, FW_DL GPIO = 0 |
| 464 | * (arg = 2): FW_DL GPIO = 1 |
| 465 | * |
| 466 | * Return: -ENOIOCTLCMD if arg is not supported, 0 in any other case |
| 467 | */ |
| 468 | int nfc_ioctl_power_states(struct file *filp, unsigned long arg) |
| 469 | { |
| 470 | int r = 0; |
| 471 | struct nqx_dev *nqx_dev = filp->private_data; |
| 472 | |
| 473 | if (arg == 0) { |
| 474 | /* |
| 475 | * We are attempting a hardware reset so let us disable |
| 476 | * interrupts to avoid spurious notifications to upper |
| 477 | * layers. |
| 478 | */ |
| 479 | nqx_disable_irq(nqx_dev); |
| 480 | dev_dbg(&nqx_dev->client->dev, |
| 481 | "gpio_set_value disable: %s: info: %p\n", |
| 482 | __func__, nqx_dev); |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 483 | if (gpio_is_valid(nqx_dev->firm_gpio)) { |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 484 | gpio_set_value(nqx_dev->firm_gpio, 0); |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 485 | usleep_range(10000, 10100); |
| 486 | } |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 487 | |
| 488 | if (gpio_is_valid(nqx_dev->ese_gpio)) { |
| 489 | if (!gpio_get_value(nqx_dev->ese_gpio)) { |
| 490 | dev_dbg(&nqx_dev->client->dev, "disabling en_gpio\n"); |
| 491 | gpio_set_value(nqx_dev->en_gpio, 0); |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 492 | usleep_range(10000, 10100); |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 493 | } else { |
| 494 | dev_dbg(&nqx_dev->client->dev, "keeping en_gpio high\n"); |
| 495 | } |
| 496 | } else { |
| 497 | dev_dbg(&nqx_dev->client->dev, "ese_gpio invalid, set en_gpio to low\n"); |
| 498 | gpio_set_value(nqx_dev->en_gpio, 0); |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 499 | usleep_range(10000, 10100); |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 500 | } |
Gaurav Singhal | 7166110 | 2018-01-30 16:34:37 +0530 | [diff] [blame] | 501 | if (nqx_dev->pdata->clk_pin_voting) { |
| 502 | r = nqx_clock_deselect(nqx_dev); |
| 503 | if (r < 0) |
| 504 | dev_err(&nqx_dev->client->dev, "unable to disable clock\n"); |
| 505 | } |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 506 | nqx_dev->nfc_ven_enabled = false; |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 507 | } else if (arg == 1) { |
| 508 | nqx_enable_irq(nqx_dev); |
| 509 | dev_dbg(&nqx_dev->client->dev, |
| 510 | "gpio_set_value enable: %s: info: %p\n", |
| 511 | __func__, nqx_dev); |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 512 | if (gpio_is_valid(nqx_dev->firm_gpio)) { |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 513 | gpio_set_value(nqx_dev->firm_gpio, 0); |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 514 | usleep_range(10000, 10100); |
| 515 | } |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 516 | gpio_set_value(nqx_dev->en_gpio, 1); |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 517 | usleep_range(10000, 10100); |
Gaurav Singhal | 7166110 | 2018-01-30 16:34:37 +0530 | [diff] [blame] | 518 | if (nqx_dev->pdata->clk_pin_voting) { |
| 519 | r = nqx_clock_select(nqx_dev); |
| 520 | if (r < 0) |
| 521 | dev_err(&nqx_dev->client->dev, "unable to enable clock\n"); |
| 522 | } |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 523 | nqx_dev->nfc_ven_enabled = true; |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 524 | } else if (arg == 2) { |
| 525 | /* |
| 526 | * We are switching to Dowload Mode, toggle the enable pin |
| 527 | * in order to set the NFCC in the new mode |
| 528 | */ |
| 529 | if (gpio_is_valid(nqx_dev->ese_gpio)) { |
| 530 | if (gpio_get_value(nqx_dev->ese_gpio)) { |
| 531 | dev_err(&nqx_dev->client->dev, |
| 532 | "FW download forbidden while ese is on\n"); |
| 533 | return -EBUSY; /* Device or resource busy */ |
| 534 | } |
| 535 | } |
| 536 | gpio_set_value(nqx_dev->en_gpio, 1); |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 537 | usleep_range(10000, 10100); |
| 538 | if (gpio_is_valid(nqx_dev->firm_gpio)) { |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 539 | gpio_set_value(nqx_dev->firm_gpio, 1); |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 540 | usleep_range(10000, 10100); |
| 541 | } |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 542 | gpio_set_value(nqx_dev->en_gpio, 0); |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 543 | usleep_range(10000, 10100); |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 544 | gpio_set_value(nqx_dev->en_gpio, 1); |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 545 | usleep_range(10000, 10100); |
Bhuvan Varshney | ae67c4e | 2018-11-23 15:15:27 +0530 | [diff] [blame] | 546 | } else if (arg == 4) { |
| 547 | /* |
| 548 | * Setting firmware download gpio to HIGH for SN100U |
| 549 | * before FW download start |
| 550 | */ |
| 551 | dev_dbg(&nqx_dev->client->dev, "SN100 fw gpio HIGH\n"); |
| 552 | if (gpio_is_valid(nqx_dev->firm_gpio)) { |
| 553 | gpio_set_value(nqx_dev->firm_gpio, 1); |
| 554 | usleep_range(10000, 10100); |
| 555 | } else { |
| 556 | dev_err(&nqx_dev->client->dev, |
| 557 | "firm_gpio is invalid\n"); |
| 558 | } |
| 559 | } else if (arg == 6) { |
| 560 | /* |
| 561 | * Setting firmware download gpio to LOW for SN100U |
| 562 | * FW download finished |
| 563 | */ |
| 564 | dev_dbg(&nqx_dev->client->dev, "SN100 fw gpio LOW\n"); |
| 565 | if (gpio_is_valid(nqx_dev->firm_gpio)) { |
| 566 | gpio_set_value(nqx_dev->firm_gpio, 0); |
| 567 | usleep_range(10000, 10100); |
| 568 | } else { |
| 569 | dev_err(&nqx_dev->client->dev, |
| 570 | "firm_gpio is invalid\n"); |
| 571 | } |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 572 | } else { |
| 573 | r = -ENOIOCTLCMD; |
| 574 | } |
| 575 | |
| 576 | return r; |
| 577 | } |
| 578 | |
| 579 | #ifdef CONFIG_COMPAT |
| 580 | static long nfc_compat_ioctl(struct file *pfile, unsigned int cmd, |
| 581 | unsigned long arg) |
| 582 | { |
| 583 | long r = 0; |
| 584 | |
| 585 | arg = (compat_u64)arg; |
| 586 | switch (cmd) { |
| 587 | case NFC_SET_PWR: |
| 588 | nfc_ioctl_power_states(pfile, arg); |
| 589 | break; |
| 590 | case ESE_SET_PWR: |
| 591 | nqx_ese_pwr(pfile->private_data, arg); |
| 592 | break; |
| 593 | case ESE_GET_PWR: |
| 594 | nqx_ese_pwr(pfile->private_data, 3); |
| 595 | break; |
| 596 | case SET_RX_BLOCK: |
| 597 | break; |
| 598 | case SET_EMULATOR_TEST_POINT: |
| 599 | break; |
| 600 | default: |
| 601 | r = -ENOTTY; |
| 602 | } |
| 603 | return r; |
| 604 | } |
| 605 | #endif |
| 606 | |
| 607 | /* |
| 608 | * nfc_ioctl_core_reset_ntf() |
| 609 | * @filp: pointer to the file descriptor |
| 610 | * |
| 611 | * Allows callers to determine if a CORE_RESET_NTF has arrived |
| 612 | * |
| 613 | * Return: the value of variable core_reset_ntf |
| 614 | */ |
| 615 | int nfc_ioctl_core_reset_ntf(struct file *filp) |
| 616 | { |
| 617 | struct nqx_dev *nqx_dev = filp->private_data; |
| 618 | |
| 619 | dev_dbg(&nqx_dev->client->dev, "%s: returning = %d\n", __func__, |
| 620 | nqx_dev->core_reset_ntf); |
| 621 | return nqx_dev->core_reset_ntf; |
| 622 | } |
| 623 | |
| 624 | /* |
| 625 | * Inside nfc_ioctl_nfcc_info |
| 626 | * |
| 627 | * @brief nfc_ioctl_nfcc_info |
| 628 | * |
| 629 | * Check the NQ Chipset and firmware version details |
| 630 | */ |
| 631 | unsigned int nfc_ioctl_nfcc_info(struct file *filp, unsigned long arg) |
| 632 | { |
| 633 | unsigned int r = 0; |
| 634 | struct nqx_dev *nqx_dev = filp->private_data; |
| 635 | |
| 636 | r = nqx_dev->nqx_info.i; |
| 637 | dev_dbg(&nqx_dev->client->dev, |
| 638 | "nqx nfc : nfc_ioctl_nfcc_info r = %d\n", r); |
| 639 | |
| 640 | return r; |
| 641 | } |
| 642 | |
| 643 | static long nfc_ioctl(struct file *pfile, unsigned int cmd, |
| 644 | unsigned long arg) |
| 645 | { |
| 646 | int r = 0; |
| 647 | |
| 648 | switch (cmd) { |
| 649 | case NFC_SET_PWR: |
| 650 | r = nfc_ioctl_power_states(pfile, arg); |
| 651 | break; |
| 652 | case ESE_SET_PWR: |
| 653 | r = nqx_ese_pwr(pfile->private_data, arg); |
| 654 | break; |
| 655 | case ESE_GET_PWR: |
| 656 | r = nqx_ese_pwr(pfile->private_data, 3); |
| 657 | break; |
| 658 | case SET_RX_BLOCK: |
| 659 | break; |
| 660 | case SET_EMULATOR_TEST_POINT: |
| 661 | break; |
| 662 | case NFCC_INITIAL_CORE_RESET_NTF: |
| 663 | r = nfc_ioctl_core_reset_ntf(pfile); |
| 664 | break; |
| 665 | case NFCC_GET_INFO: |
| 666 | r = nfc_ioctl_nfcc_info(pfile, arg); |
| 667 | break; |
| 668 | default: |
| 669 | r = -ENOIOCTLCMD; |
| 670 | } |
| 671 | return r; |
| 672 | } |
| 673 | |
| 674 | static const struct file_operations nfc_dev_fops = { |
| 675 | .owner = THIS_MODULE, |
| 676 | .llseek = no_llseek, |
| 677 | .read = nfc_read, |
| 678 | .write = nfc_write, |
| 679 | .open = nfc_open, |
| 680 | .unlocked_ioctl = nfc_ioctl, |
| 681 | #ifdef CONFIG_COMPAT |
| 682 | .compat_ioctl = nfc_compat_ioctl |
| 683 | #endif |
| 684 | }; |
| 685 | |
| 686 | /* Check for availability of NQ_ NFC controller hardware */ |
| 687 | static int nfcc_hw_check(struct i2c_client *client, struct nqx_dev *nqx_dev) |
| 688 | { |
| 689 | int ret = 0; |
| 690 | |
| 691 | unsigned char raw_nci_reset_cmd[] = {0x20, 0x00, 0x01, 0x00}; |
| 692 | unsigned char raw_nci_init_cmd[] = {0x20, 0x01, 0x00}; |
Tapas Dey | b5e6960 | 2019-05-07 11:33:00 +0530 | [diff] [blame] | 693 | unsigned char nci_get_version_cmd[] = {0x00, 0x04, 0xF1, |
| 694 | 0x00, 0x00, 0x00, 0x6E, 0xEF}; |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 695 | unsigned char nci_init_rsp[28]; |
| 696 | unsigned char nci_reset_rsp[6]; |
Tapas Dey | b5e6960 | 2019-05-07 11:33:00 +0530 | [diff] [blame] | 697 | unsigned char nci_get_version_rsp[12]; |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 698 | unsigned char init_rsp_len = 0; |
| 699 | unsigned int enable_gpio = nqx_dev->en_gpio; |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 700 | |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 701 | /* making sure that the NFCC starts in a clean state. */ |
| 702 | gpio_set_value(enable_gpio, 0);/* ULPM: Disable */ |
| 703 | /* hardware dependent delay */ |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 704 | usleep_range(10000, 10100); |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 705 | gpio_set_value(enable_gpio, 1);/* HPD : Enable*/ |
| 706 | /* hardware dependent delay */ |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 707 | usleep_range(10000, 10100); |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 708 | |
| 709 | /* send NCI CORE RESET CMD with Keep Config parameters */ |
| 710 | ret = i2c_master_send(client, raw_nci_reset_cmd, |
| 711 | sizeof(raw_nci_reset_cmd)); |
| 712 | if (ret < 0) { |
| 713 | dev_err(&client->dev, |
Tapas Dey | b5e6960 | 2019-05-07 11:33:00 +0530 | [diff] [blame] | 714 | "%s: - i2c_master_send core reset Error\n", __func__); |
| 715 | |
| 716 | if (gpio_is_valid(nqx_dev->firm_gpio)) { |
| 717 | gpio_set_value(nqx_dev->firm_gpio, 1); |
| 718 | usleep_range(10000, 10100); |
| 719 | } |
| 720 | gpio_set_value(nqx_dev->en_gpio, 0); |
| 721 | usleep_range(10000, 10100); |
| 722 | gpio_set_value(nqx_dev->en_gpio, 1); |
| 723 | usleep_range(10000, 10100); |
| 724 | |
| 725 | ret = i2c_master_send(client, nci_get_version_cmd, |
| 726 | sizeof(nci_get_version_cmd)); |
| 727 | |
| 728 | if (ret < 0) { |
| 729 | dev_err(&client->dev, |
| 730 | "%s: - i2c_master_send get version cmd Error\n", |
| 731 | __func__); |
| 732 | goto err_nfcc_hw_check; |
| 733 | } |
| 734 | /* hardware dependent delay */ |
| 735 | usleep_range(10000, 10100); |
| 736 | |
| 737 | ret = i2c_master_recv(client, nci_get_version_rsp, |
| 738 | sizeof(nci_get_version_rsp)); |
| 739 | if (ret < 0) { |
| 740 | dev_err(&client->dev, |
| 741 | "%s: - i2c_master_recv get version rsp Error\n", |
| 742 | __func__); |
| 743 | goto err_nfcc_hw_check; |
| 744 | } else { |
| 745 | nqx_dev->nqx_info.info.chip_type = |
| 746 | nci_get_version_rsp[3]; |
| 747 | nqx_dev->nqx_info.info.rom_version = |
| 748 | nci_get_version_rsp[4]; |
Tapas Dey | 48613f8 | 2019-11-21 16:18:42 +0530 | [diff] [blame] | 749 | if ((nci_get_version_rsp[3] == NFCC_SN100_A) |
| 750 | || (nci_get_version_rsp[3] == NFCC_SN100_B)) { |
| 751 | nqx_dev->nqx_info.info.fw_minor = |
| 752 | nci_get_version_rsp[6]; |
| 753 | nqx_dev->nqx_info.info.fw_major = |
| 754 | nci_get_version_rsp[7]; |
| 755 | } else { |
| 756 | nqx_dev->nqx_info.info.fw_minor = |
| 757 | nci_get_version_rsp[10]; |
| 758 | nqx_dev->nqx_info.info.fw_major = |
| 759 | nci_get_version_rsp[11]; |
| 760 | } |
Tapas Dey | b5e6960 | 2019-05-07 11:33:00 +0530 | [diff] [blame] | 761 | } |
| 762 | goto err_nfcc_reset_failed; |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 763 | } |
Bhuvan Varshney | 8e2ca88 | 2019-09-09 19:20:37 +0530 | [diff] [blame] | 764 | ret = is_data_available_for_read(nqx_dev); |
| 765 | if (ret < 0) { |
| 766 | nqx_disable_irq(nqx_dev); |
| 767 | goto err_nfcc_hw_check; |
| 768 | } |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 769 | |
| 770 | /* Read Response of RESET command */ |
| 771 | ret = i2c_master_recv(client, nci_reset_rsp, |
| 772 | sizeof(nci_reset_rsp)); |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 773 | if (ret < 0) { |
| 774 | dev_err(&client->dev, |
| 775 | "%s: - i2c_master_recv Error\n", __func__); |
| 776 | goto err_nfcc_hw_check; |
| 777 | } |
Bhuvan Varshney | 8e2ca88 | 2019-09-09 19:20:37 +0530 | [diff] [blame] | 778 | |
| 779 | /* send NCI CORE INIT CMD */ |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 780 | ret = nqx_standby_write(nqx_dev, raw_nci_init_cmd, |
| 781 | sizeof(raw_nci_init_cmd)); |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 782 | if (ret < 0) { |
| 783 | dev_err(&client->dev, |
Tapas Dey | b5e6960 | 2019-05-07 11:33:00 +0530 | [diff] [blame] | 784 | "%s: - i2c_master_send failed for Core INIT\n", __func__); |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 785 | goto err_nfcc_core_init_fail; |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 786 | } |
Bhuvan Varshney | 8e2ca88 | 2019-09-09 19:20:37 +0530 | [diff] [blame] | 787 | ret = is_data_available_for_read(nqx_dev); |
| 788 | if (ret < 0) { |
| 789 | nqx_disable_irq(nqx_dev); |
| 790 | goto err_nfcc_hw_check; |
| 791 | } |
| 792 | |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 793 | /* Read Response of INIT command */ |
| 794 | ret = i2c_master_recv(client, nci_init_rsp, |
| 795 | sizeof(nci_init_rsp)); |
| 796 | if (ret < 0) { |
| 797 | dev_err(&client->dev, |
| 798 | "%s: - i2c_master_recv Error\n", __func__); |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 799 | goto err_nfcc_core_init_fail; |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 800 | } |
| 801 | init_rsp_len = 2 + nci_init_rsp[2]; /*payload + len*/ |
| 802 | if (init_rsp_len > PAYLOAD_HEADER_LENGTH) { |
| 803 | nqx_dev->nqx_info.info.chip_type = |
| 804 | nci_init_rsp[init_rsp_len - 3]; |
| 805 | nqx_dev->nqx_info.info.rom_version = |
| 806 | nci_init_rsp[init_rsp_len - 2]; |
| 807 | nqx_dev->nqx_info.info.fw_major = |
| 808 | nci_init_rsp[init_rsp_len - 1]; |
| 809 | nqx_dev->nqx_info.info.fw_minor = |
| 810 | nci_init_rsp[init_rsp_len]; |
| 811 | } |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 812 | dev_dbg(&client->dev, |
| 813 | "%s: - nq - reset cmd answer : NfcNciRx %x %x %x\n", |
| 814 | __func__, nci_reset_rsp[0], |
| 815 | nci_reset_rsp[1], nci_reset_rsp[2]); |
| 816 | |
Tapas Dey | b5e6960 | 2019-05-07 11:33:00 +0530 | [diff] [blame] | 817 | err_nfcc_reset_failed: |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 818 | dev_dbg(&nqx_dev->client->dev, "NQ NFCC chip_type = %x\n", |
| 819 | nqx_dev->nqx_info.info.chip_type); |
| 820 | dev_dbg(&nqx_dev->client->dev, "NQ fw version = %x.%x.%x\n", |
| 821 | nqx_dev->nqx_info.info.rom_version, |
| 822 | nqx_dev->nqx_info.info.fw_major, |
| 823 | nqx_dev->nqx_info.info.fw_minor); |
| 824 | |
| 825 | switch (nqx_dev->nqx_info.info.chip_type) { |
| 826 | case NFCC_NQ_210: |
| 827 | dev_dbg(&client->dev, |
| 828 | "%s: ## NFCC == NQ210 ##\n", __func__); |
| 829 | break; |
| 830 | case NFCC_NQ_220: |
| 831 | dev_dbg(&client->dev, |
| 832 | "%s: ## NFCC == NQ220 ##\n", __func__); |
| 833 | break; |
| 834 | case NFCC_NQ_310: |
| 835 | dev_dbg(&client->dev, |
| 836 | "%s: ## NFCC == NQ310 ##\n", __func__); |
| 837 | break; |
| 838 | case NFCC_NQ_330: |
| 839 | dev_dbg(&client->dev, |
| 840 | "%s: ## NFCC == NQ330 ##\n", __func__); |
| 841 | break; |
| 842 | case NFCC_PN66T: |
| 843 | dev_dbg(&client->dev, |
| 844 | "%s: ## NFCC == PN66T ##\n", __func__); |
| 845 | break; |
Bhuvan Varshney | 8e2ca88 | 2019-09-09 19:20:37 +0530 | [diff] [blame] | 846 | case NFCC_SN100_A: |
| 847 | case NFCC_SN100_B: |
| 848 | dev_dbg(&client->dev, |
| 849 | "%s: ## NFCC == SN100x ##\n", __func__); |
| 850 | break; |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 851 | default: |
| 852 | dev_err(&client->dev, |
| 853 | "%s: - NFCC HW not Supported\n", __func__); |
| 854 | break; |
| 855 | } |
| 856 | |
| 857 | /*Disable NFC by default to save power on boot*/ |
| 858 | gpio_set_value(enable_gpio, 0);/* ULPM: Disable */ |
| 859 | ret = 0; |
| 860 | goto done; |
| 861 | |
Gaurav Singhal | 165add7 | 2017-10-13 17:17:58 +0530 | [diff] [blame] | 862 | err_nfcc_core_init_fail: |
| 863 | dev_err(&client->dev, |
| 864 | "%s: - nq - reset cmd answer : NfcNciRx %x %x %x\n", |
| 865 | __func__, nci_reset_rsp[0], |
| 866 | nci_reset_rsp[1], nci_reset_rsp[2]); |
| 867 | |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 868 | err_nfcc_hw_check: |
| 869 | ret = -ENXIO; |
| 870 | dev_err(&client->dev, |
| 871 | "%s: - NFCC HW not available\n", __func__); |
| 872 | done: |
| 873 | return ret; |
| 874 | } |
| 875 | |
| 876 | /* |
| 877 | * Routine to enable clock. |
| 878 | * this routine can be extended to select from multiple |
| 879 | * sources based on clk_src_name. |
| 880 | */ |
| 881 | static int nqx_clock_select(struct nqx_dev *nqx_dev) |
| 882 | { |
| 883 | int r = 0; |
| 884 | |
| 885 | nqx_dev->s_clk = clk_get(&nqx_dev->client->dev, "ref_clk"); |
| 886 | |
| 887 | if (nqx_dev->s_clk == NULL) |
| 888 | goto err_clk; |
| 889 | |
| 890 | if (nqx_dev->clk_run == false) |
| 891 | r = clk_prepare_enable(nqx_dev->s_clk); |
| 892 | |
| 893 | if (r) |
| 894 | goto err_clk; |
| 895 | |
| 896 | nqx_dev->clk_run = true; |
| 897 | |
| 898 | return r; |
| 899 | |
| 900 | err_clk: |
| 901 | r = -1; |
| 902 | return r; |
| 903 | } |
| 904 | |
| 905 | /* |
| 906 | * Routine to disable clocks |
| 907 | */ |
| 908 | static int nqx_clock_deselect(struct nqx_dev *nqx_dev) |
| 909 | { |
| 910 | int r = -1; |
| 911 | |
| 912 | if (nqx_dev->s_clk != NULL) { |
| 913 | if (nqx_dev->clk_run == true) { |
| 914 | clk_disable_unprepare(nqx_dev->s_clk); |
| 915 | nqx_dev->clk_run = false; |
| 916 | } |
| 917 | return 0; |
| 918 | } |
| 919 | return r; |
| 920 | } |
| 921 | |
| 922 | static int nfc_parse_dt(struct device *dev, struct nqx_platform_data *pdata) |
| 923 | { |
| 924 | int r = 0; |
| 925 | struct device_node *np = dev->of_node; |
| 926 | |
| 927 | pdata->en_gpio = of_get_named_gpio(np, "qcom,nq-ven", 0); |
| 928 | if ((!gpio_is_valid(pdata->en_gpio))) |
| 929 | return -EINVAL; |
| 930 | disable_ctrl = pdata->en_gpio; |
| 931 | |
| 932 | pdata->irq_gpio = of_get_named_gpio(np, "qcom,nq-irq", 0); |
| 933 | if ((!gpio_is_valid(pdata->irq_gpio))) |
| 934 | return -EINVAL; |
| 935 | |
| 936 | pdata->firm_gpio = of_get_named_gpio(np, "qcom,nq-firm", 0); |
| 937 | if (!gpio_is_valid(pdata->firm_gpio)) { |
| 938 | dev_warn(dev, |
| 939 | "FIRM GPIO <OPTIONAL> error getting from OF node\n"); |
| 940 | pdata->firm_gpio = -EINVAL; |
| 941 | } |
| 942 | |
| 943 | pdata->ese_gpio = of_get_named_gpio(np, "qcom,nq-esepwr", 0); |
| 944 | if (!gpio_is_valid(pdata->ese_gpio)) { |
| 945 | dev_warn(dev, |
| 946 | "ese GPIO <OPTIONAL> error getting from OF node\n"); |
| 947 | pdata->ese_gpio = -EINVAL; |
| 948 | } |
| 949 | |
Gaurav Singhal | 7166110 | 2018-01-30 16:34:37 +0530 | [diff] [blame] | 950 | if (of_property_read_string(np, "qcom,clk-src", &pdata->clk_src_name)) |
| 951 | pdata->clk_pin_voting = false; |
| 952 | else |
| 953 | pdata->clk_pin_voting = true; |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 954 | |
| 955 | pdata->clkreq_gpio = of_get_named_gpio(np, "qcom,nq-clkreq", 0); |
| 956 | |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 957 | return r; |
| 958 | } |
| 959 | |
| 960 | static inline int gpio_input_init(const struct device * const dev, |
| 961 | const int gpio, const char * const gpio_name) |
| 962 | { |
| 963 | int r = gpio_request(gpio, gpio_name); |
| 964 | |
| 965 | if (r) { |
| 966 | dev_err(dev, "unable to request gpio [%d]\n", gpio); |
| 967 | return r; |
| 968 | } |
| 969 | |
| 970 | r = gpio_direction_input(gpio); |
| 971 | if (r) |
| 972 | dev_err(dev, "unable to set direction for gpio [%d]\n", gpio); |
| 973 | |
| 974 | return r; |
| 975 | } |
| 976 | |
| 977 | static int nqx_probe(struct i2c_client *client, |
| 978 | const struct i2c_device_id *id) |
| 979 | { |
| 980 | int r = 0; |
| 981 | int irqn = 0; |
| 982 | struct nqx_platform_data *platform_data; |
| 983 | struct nqx_dev *nqx_dev; |
| 984 | |
| 985 | dev_dbg(&client->dev, "%s: enter\n", __func__); |
| 986 | if (client->dev.of_node) { |
| 987 | platform_data = devm_kzalloc(&client->dev, |
| 988 | sizeof(struct nqx_platform_data), GFP_KERNEL); |
| 989 | if (!platform_data) { |
| 990 | r = -ENOMEM; |
| 991 | goto err_platform_data; |
| 992 | } |
| 993 | r = nfc_parse_dt(&client->dev, platform_data); |
| 994 | if (r) |
| 995 | goto err_free_data; |
| 996 | } else |
| 997 | platform_data = client->dev.platform_data; |
| 998 | |
| 999 | dev_dbg(&client->dev, |
| 1000 | "%s, inside nfc-nci flags = %x\n", |
| 1001 | __func__, client->flags); |
| 1002 | |
| 1003 | if (platform_data == NULL) { |
| 1004 | dev_err(&client->dev, "%s: failed\n", __func__); |
| 1005 | r = -ENODEV; |
| 1006 | goto err_platform_data; |
| 1007 | } |
| 1008 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
| 1009 | dev_err(&client->dev, "%s: need I2C_FUNC_I2C\n", __func__); |
| 1010 | r = -ENODEV; |
| 1011 | goto err_free_data; |
| 1012 | } |
| 1013 | nqx_dev = kzalloc(sizeof(*nqx_dev), GFP_KERNEL); |
| 1014 | if (nqx_dev == NULL) { |
| 1015 | r = -ENOMEM; |
| 1016 | goto err_free_data; |
| 1017 | } |
| 1018 | nqx_dev->client = client; |
| 1019 | nqx_dev->kbuflen = MAX_BUFFER_SIZE; |
| 1020 | nqx_dev->kbuf = kzalloc(MAX_BUFFER_SIZE, GFP_KERNEL); |
| 1021 | if (!nqx_dev->kbuf) { |
| 1022 | dev_err(&client->dev, |
| 1023 | "failed to allocate memory for nqx_dev->kbuf\n"); |
| 1024 | r = -ENOMEM; |
| 1025 | goto err_free_dev; |
| 1026 | } |
| 1027 | |
| 1028 | if (gpio_is_valid(platform_data->en_gpio)) { |
| 1029 | r = gpio_request(platform_data->en_gpio, "nfc_reset_gpio"); |
| 1030 | if (r) { |
| 1031 | dev_err(&client->dev, |
| 1032 | "%s: unable to request nfc reset gpio [%d]\n", |
| 1033 | __func__, |
| 1034 | platform_data->en_gpio); |
| 1035 | goto err_mem; |
| 1036 | } |
| 1037 | r = gpio_direction_output(platform_data->en_gpio, 0); |
| 1038 | if (r) { |
| 1039 | dev_err(&client->dev, |
| 1040 | "%s: unable to set direction for nfc reset gpio [%d]\n", |
| 1041 | __func__, |
| 1042 | platform_data->en_gpio); |
| 1043 | goto err_en_gpio; |
| 1044 | } |
| 1045 | } else { |
| 1046 | dev_err(&client->dev, |
| 1047 | "%s: nfc reset gpio not provided\n", __func__); |
| 1048 | goto err_mem; |
| 1049 | } |
| 1050 | |
| 1051 | if (gpio_is_valid(platform_data->irq_gpio)) { |
| 1052 | r = gpio_request(platform_data->irq_gpio, "nfc_irq_gpio"); |
| 1053 | if (r) { |
| 1054 | dev_err(&client->dev, "%s: unable to request nfc irq gpio [%d]\n", |
| 1055 | __func__, platform_data->irq_gpio); |
| 1056 | goto err_en_gpio; |
| 1057 | } |
| 1058 | r = gpio_direction_input(platform_data->irq_gpio); |
| 1059 | if (r) { |
| 1060 | dev_err(&client->dev, |
| 1061 | "%s: unable to set direction for nfc irq gpio [%d]\n", |
| 1062 | __func__, |
| 1063 | platform_data->irq_gpio); |
| 1064 | goto err_irq_gpio; |
| 1065 | } |
| 1066 | irqn = gpio_to_irq(platform_data->irq_gpio); |
| 1067 | if (irqn < 0) { |
| 1068 | r = irqn; |
| 1069 | goto err_irq_gpio; |
| 1070 | } |
| 1071 | client->irq = irqn; |
| 1072 | } else { |
| 1073 | dev_err(&client->dev, "%s: irq gpio not provided\n", __func__); |
| 1074 | goto err_en_gpio; |
| 1075 | } |
| 1076 | if (gpio_is_valid(platform_data->firm_gpio)) { |
| 1077 | r = gpio_request(platform_data->firm_gpio, |
| 1078 | "nfc_firm_gpio"); |
| 1079 | if (r) { |
| 1080 | dev_err(&client->dev, |
| 1081 | "%s: unable to request nfc firmware gpio [%d]\n", |
| 1082 | __func__, platform_data->firm_gpio); |
| 1083 | goto err_irq_gpio; |
| 1084 | } |
| 1085 | r = gpio_direction_output(platform_data->firm_gpio, 0); |
| 1086 | if (r) { |
| 1087 | dev_err(&client->dev, |
| 1088 | "%s: cannot set direction for nfc firmware gpio [%d]\n", |
| 1089 | __func__, platform_data->firm_gpio); |
| 1090 | goto err_firm_gpio; |
| 1091 | } |
| 1092 | } else { |
| 1093 | dev_err(&client->dev, |
| 1094 | "%s: firm gpio not provided\n", __func__); |
| 1095 | goto err_irq_gpio; |
| 1096 | } |
| 1097 | if (gpio_is_valid(platform_data->ese_gpio)) { |
| 1098 | r = gpio_request(platform_data->ese_gpio, |
| 1099 | "nfc-ese_pwr"); |
| 1100 | if (r) { |
| 1101 | nqx_dev->ese_gpio = -EINVAL; |
| 1102 | dev_err(&client->dev, |
| 1103 | "%s: unable to request nfc ese gpio [%d]\n", |
| 1104 | __func__, platform_data->ese_gpio); |
| 1105 | /* ese gpio optional so we should continue */ |
| 1106 | } else { |
| 1107 | nqx_dev->ese_gpio = platform_data->ese_gpio; |
| 1108 | r = gpio_direction_output(platform_data->ese_gpio, 0); |
| 1109 | if (r) { |
| 1110 | /* |
| 1111 | * free ese gpio and set invalid |
| 1112 | * to avoid further use |
| 1113 | */ |
| 1114 | gpio_free(platform_data->ese_gpio); |
| 1115 | nqx_dev->ese_gpio = -EINVAL; |
| 1116 | dev_err(&client->dev, |
| 1117 | "%s: cannot set direction for nfc ese gpio [%d]\n", |
| 1118 | __func__, platform_data->ese_gpio); |
| 1119 | /* ese gpio optional so we should continue */ |
| 1120 | } |
| 1121 | } |
| 1122 | } else { |
| 1123 | nqx_dev->ese_gpio = -EINVAL; |
| 1124 | dev_err(&client->dev, |
| 1125 | "%s: ese gpio not provided\n", __func__); |
| 1126 | /* ese gpio optional so we should continue */ |
| 1127 | } |
| 1128 | if (gpio_is_valid(platform_data->clkreq_gpio)) { |
| 1129 | r = gpio_request(platform_data->clkreq_gpio, |
| 1130 | "nfc_clkreq_gpio"); |
| 1131 | if (r) { |
| 1132 | dev_err(&client->dev, |
| 1133 | "%s: unable to request nfc clkreq gpio [%d]\n", |
| 1134 | __func__, platform_data->clkreq_gpio); |
| 1135 | goto err_ese_gpio; |
| 1136 | } |
| 1137 | r = gpio_direction_input(platform_data->clkreq_gpio); |
| 1138 | if (r) { |
| 1139 | dev_err(&client->dev, |
| 1140 | "%s: cannot set direction for nfc clkreq gpio [%d]\n", |
| 1141 | __func__, platform_data->clkreq_gpio); |
| 1142 | goto err_clkreq_gpio; |
| 1143 | } |
| 1144 | } else { |
| 1145 | dev_err(&client->dev, |
| 1146 | "%s: clkreq gpio not provided\n", __func__); |
| 1147 | goto err_ese_gpio; |
| 1148 | } |
| 1149 | |
| 1150 | nqx_dev->en_gpio = platform_data->en_gpio; |
| 1151 | nqx_dev->irq_gpio = platform_data->irq_gpio; |
| 1152 | nqx_dev->firm_gpio = platform_data->firm_gpio; |
| 1153 | nqx_dev->clkreq_gpio = platform_data->clkreq_gpio; |
| 1154 | nqx_dev->pdata = platform_data; |
| 1155 | |
| 1156 | /* init mutex and queues */ |
| 1157 | init_waitqueue_head(&nqx_dev->read_wq); |
| 1158 | mutex_init(&nqx_dev->read_mutex); |
| 1159 | spin_lock_init(&nqx_dev->irq_enabled_lock); |
| 1160 | |
| 1161 | nqx_dev->nqx_device.minor = MISC_DYNAMIC_MINOR; |
| 1162 | nqx_dev->nqx_device.name = "nq-nci"; |
| 1163 | nqx_dev->nqx_device.fops = &nfc_dev_fops; |
| 1164 | |
| 1165 | r = misc_register(&nqx_dev->nqx_device); |
| 1166 | if (r) { |
| 1167 | dev_err(&client->dev, "%s: misc_register failed\n", __func__); |
| 1168 | goto err_misc_register; |
| 1169 | } |
| 1170 | |
| 1171 | /* NFC_INT IRQ */ |
| 1172 | nqx_dev->irq_enabled = true; |
| 1173 | r = request_irq(client->irq, nqx_dev_irq_handler, |
| 1174 | IRQF_TRIGGER_HIGH, client->name, nqx_dev); |
| 1175 | if (r) { |
| 1176 | dev_err(&client->dev, "%s: request_irq failed\n", __func__); |
| 1177 | goto err_request_irq_failed; |
| 1178 | } |
| 1179 | nqx_disable_irq(nqx_dev); |
| 1180 | |
| 1181 | /* |
| 1182 | * To be efficient we need to test whether nfcc hardware is physically |
| 1183 | * present before attempting further hardware initialisation. |
| 1184 | * |
| 1185 | */ |
| 1186 | r = nfcc_hw_check(client, nqx_dev); |
| 1187 | if (r) { |
| 1188 | /* make sure NFCC is not enabled */ |
| 1189 | gpio_set_value(platform_data->en_gpio, 0); |
| 1190 | /* We don't think there is hardware switch NFC OFF */ |
| 1191 | goto err_request_hw_check_failed; |
| 1192 | } |
| 1193 | |
| 1194 | /* Register reboot notifier here */ |
| 1195 | r = register_reboot_notifier(&nfcc_notifier); |
| 1196 | if (r) { |
| 1197 | dev_err(&client->dev, |
| 1198 | "%s: cannot register reboot notifier(err = %d)\n", |
| 1199 | __func__, r); |
| 1200 | /* |
| 1201 | * nfcc_hw_check function not doing memory |
| 1202 | * allocation so using same goto target here |
| 1203 | */ |
| 1204 | goto err_request_hw_check_failed; |
| 1205 | } |
| 1206 | |
| 1207 | #ifdef NFC_KERNEL_BU |
| 1208 | r = nqx_clock_select(nqx_dev); |
| 1209 | if (r < 0) { |
| 1210 | dev_err(&client->dev, |
| 1211 | "%s: nqx_clock_select failed\n", __func__); |
| 1212 | goto err_clock_en_failed; |
| 1213 | } |
| 1214 | gpio_set_value(platform_data->en_gpio, 1); |
| 1215 | #endif |
| 1216 | device_init_wakeup(&client->dev, true); |
| 1217 | device_set_wakeup_capable(&client->dev, true); |
| 1218 | i2c_set_clientdata(client, nqx_dev); |
| 1219 | nqx_dev->irq_wake_up = false; |
| 1220 | |
| 1221 | dev_err(&client->dev, |
| 1222 | "%s: probing NFCC NQxxx exited successfully\n", |
| 1223 | __func__); |
| 1224 | return 0; |
| 1225 | |
| 1226 | #ifdef NFC_KERNEL_BU |
| 1227 | err_clock_en_failed: |
| 1228 | unregister_reboot_notifier(&nfcc_notifier); |
| 1229 | #endif |
| 1230 | err_request_hw_check_failed: |
| 1231 | free_irq(client->irq, nqx_dev); |
| 1232 | err_request_irq_failed: |
| 1233 | misc_deregister(&nqx_dev->nqx_device); |
| 1234 | err_misc_register: |
| 1235 | mutex_destroy(&nqx_dev->read_mutex); |
| 1236 | err_clkreq_gpio: |
| 1237 | gpio_free(platform_data->clkreq_gpio); |
| 1238 | err_ese_gpio: |
| 1239 | /* optional gpio, not sure was configured in probe */ |
Bhuvan Varshney | bf32b4a | 2019-03-20 13:26:27 +0530 | [diff] [blame] | 1240 | if (gpio_is_valid(platform_data->ese_gpio)) |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 1241 | gpio_free(platform_data->ese_gpio); |
| 1242 | err_firm_gpio: |
| 1243 | gpio_free(platform_data->firm_gpio); |
| 1244 | err_irq_gpio: |
| 1245 | gpio_free(platform_data->irq_gpio); |
| 1246 | err_en_gpio: |
| 1247 | gpio_free(platform_data->en_gpio); |
| 1248 | err_mem: |
| 1249 | kfree(nqx_dev->kbuf); |
| 1250 | err_free_dev: |
| 1251 | kfree(nqx_dev); |
| 1252 | err_free_data: |
| 1253 | if (client->dev.of_node) |
| 1254 | devm_kfree(&client->dev, platform_data); |
| 1255 | err_platform_data: |
| 1256 | dev_err(&client->dev, |
| 1257 | "%s: probing nqxx failed, check hardware\n", |
| 1258 | __func__); |
| 1259 | return r; |
| 1260 | } |
| 1261 | |
| 1262 | static int nqx_remove(struct i2c_client *client) |
| 1263 | { |
| 1264 | int ret = 0; |
| 1265 | struct nqx_dev *nqx_dev; |
| 1266 | |
| 1267 | nqx_dev = i2c_get_clientdata(client); |
| 1268 | if (!nqx_dev) { |
| 1269 | dev_err(&client->dev, |
| 1270 | "%s: device doesn't exist anymore\n", __func__); |
| 1271 | ret = -ENODEV; |
| 1272 | goto err; |
| 1273 | } |
| 1274 | |
| 1275 | unregister_reboot_notifier(&nfcc_notifier); |
| 1276 | free_irq(client->irq, nqx_dev); |
| 1277 | misc_deregister(&nqx_dev->nqx_device); |
| 1278 | mutex_destroy(&nqx_dev->read_mutex); |
| 1279 | gpio_free(nqx_dev->clkreq_gpio); |
| 1280 | /* optional gpio, not sure was configured in probe */ |
| 1281 | if (nqx_dev->ese_gpio > 0) |
| 1282 | gpio_free(nqx_dev->ese_gpio); |
| 1283 | gpio_free(nqx_dev->firm_gpio); |
| 1284 | gpio_free(nqx_dev->irq_gpio); |
| 1285 | gpio_free(nqx_dev->en_gpio); |
| 1286 | kfree(nqx_dev->kbuf); |
| 1287 | if (client->dev.of_node) |
| 1288 | devm_kfree(&client->dev, nqx_dev->pdata); |
| 1289 | |
| 1290 | kfree(nqx_dev); |
| 1291 | err: |
| 1292 | return ret; |
| 1293 | } |
| 1294 | |
| 1295 | static int nqx_suspend(struct device *device) |
| 1296 | { |
| 1297 | struct i2c_client *client = to_i2c_client(device); |
| 1298 | struct nqx_dev *nqx_dev = i2c_get_clientdata(client); |
| 1299 | |
| 1300 | if (device_may_wakeup(&client->dev) && nqx_dev->irq_enabled) { |
| 1301 | if (!enable_irq_wake(client->irq)) |
| 1302 | nqx_dev->irq_wake_up = true; |
| 1303 | } |
| 1304 | return 0; |
| 1305 | } |
| 1306 | |
| 1307 | static int nqx_resume(struct device *device) |
| 1308 | { |
| 1309 | struct i2c_client *client = to_i2c_client(device); |
| 1310 | struct nqx_dev *nqx_dev = i2c_get_clientdata(client); |
| 1311 | |
| 1312 | if (device_may_wakeup(&client->dev) && nqx_dev->irq_wake_up) { |
| 1313 | if (!disable_irq_wake(client->irq)) |
| 1314 | nqx_dev->irq_wake_up = false; |
| 1315 | } |
| 1316 | return 0; |
| 1317 | } |
| 1318 | |
| 1319 | static const struct i2c_device_id nqx_id[] = { |
| 1320 | {"nqx-i2c", 0}, |
| 1321 | {} |
| 1322 | }; |
| 1323 | |
| 1324 | static const struct dev_pm_ops nfc_pm_ops = { |
| 1325 | SET_SYSTEM_SLEEP_PM_OPS(nqx_suspend, nqx_resume) |
| 1326 | }; |
| 1327 | |
| 1328 | static struct i2c_driver nqx = { |
| 1329 | .id_table = nqx_id, |
| 1330 | .probe = nqx_probe, |
| 1331 | .remove = nqx_remove, |
| 1332 | .driver = { |
| 1333 | .owner = THIS_MODULE, |
| 1334 | .name = "nq-nci", |
| 1335 | .of_match_table = msm_match_table, |
Lingutla Chandrasekhar | 788cb1c | 2016-09-12 11:10:27 +0530 | [diff] [blame] | 1336 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
Gaurav Singhal | c53bc29 | 2017-02-16 16:35:39 +0530 | [diff] [blame] | 1337 | .pm = &nfc_pm_ops, |
| 1338 | }, |
| 1339 | }; |
| 1340 | |
| 1341 | static int nfcc_reboot(struct notifier_block *notifier, unsigned long val, |
| 1342 | void *v) |
| 1343 | { |
| 1344 | gpio_set_value(disable_ctrl, 1); |
| 1345 | return NOTIFY_OK; |
| 1346 | } |
| 1347 | |
| 1348 | /* |
| 1349 | * module load/unload record keeping |
| 1350 | */ |
| 1351 | static int __init nqx_dev_init(void) |
| 1352 | { |
| 1353 | return i2c_add_driver(&nqx); |
| 1354 | } |
| 1355 | module_init(nqx_dev_init); |
| 1356 | |
| 1357 | static void __exit nqx_dev_exit(void) |
| 1358 | { |
| 1359 | unregister_reboot_notifier(&nfcc_notifier); |
| 1360 | i2c_del_driver(&nqx); |
| 1361 | } |
| 1362 | module_exit(nqx_dev_exit); |
| 1363 | |
| 1364 | MODULE_DESCRIPTION("NFC nqx"); |
| 1365 | MODULE_LICENSE("GPL v2"); |