Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * Copyright (c) 2015-2019, The Linux Foundation. All rights reserved. |
| 4 | */ |
| 5 | |
| 6 | #include <linux/kernel.h> |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/fs.h> |
| 9 | #include <linux/reboot.h> |
| 10 | #include <linux/slab.h> |
| 11 | #include <linux/irq.h> |
| 12 | #include <linux/delay.h> |
| 13 | #include <linux/interrupt.h> |
| 14 | #include <linux/gpio.h> |
| 15 | #include <linux/spinlock.h> |
| 16 | #include <linux/of_gpio.h> |
| 17 | #include <linux/of_device.h> |
| 18 | #include <linux/uaccess.h> |
| 19 | #include "nq-nci.h" |
| 20 | #include <linux/clk.h> |
| 21 | #ifdef CONFIG_COMPAT |
| 22 | #include <linux/compat.h> |
| 23 | #endif |
Karthik Poosa | 9681a3d | 2019-07-17 11:59:30 +0530 | [diff] [blame] | 24 | #include <linux/jiffies.h> |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 25 | |
| 26 | struct nqx_platform_data { |
| 27 | unsigned int irq_gpio; |
| 28 | unsigned int en_gpio; |
| 29 | unsigned int clkreq_gpio; |
| 30 | unsigned int firm_gpio; |
| 31 | unsigned int ese_gpio; |
| 32 | const char *clk_src_name; |
| 33 | /* NFC_CLK pin voting state */ |
| 34 | bool clk_pin_voting; |
| 35 | }; |
| 36 | |
| 37 | static const struct of_device_id msm_match_table[] = { |
| 38 | {.compatible = "qcom,nq-nci"}, |
| 39 | {} |
| 40 | }; |
| 41 | |
| 42 | MODULE_DEVICE_TABLE(of, msm_match_table); |
| 43 | |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 44 | struct nqx_dev { |
| 45 | wait_queue_head_t read_wq; |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 46 | wait_queue_head_t cold_reset_read_wq; |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 47 | struct mutex read_mutex; |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 48 | struct mutex dev_ref_mutex; |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 49 | struct i2c_client *client; |
| 50 | dev_t devno; |
| 51 | struct class *nqx_class; |
| 52 | struct device *nqx_device; |
| 53 | struct cdev c_dev; |
| 54 | union nqx_uinfo nqx_info; |
| 55 | /* NFC GPIO variables */ |
| 56 | unsigned int irq_gpio; |
| 57 | unsigned int en_gpio; |
| 58 | unsigned int firm_gpio; |
| 59 | unsigned int clkreq_gpio; |
| 60 | unsigned int ese_gpio; |
| 61 | /* NFC VEN pin state powered by Nfc */ |
| 62 | bool nfc_ven_enabled; |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 63 | /* NFC state reflected from MW */ |
| 64 | bool nfc_enabled; |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 65 | /* NFC_IRQ state */ |
| 66 | bool irq_enabled; |
| 67 | /* NFC_IRQ wake-up state */ |
| 68 | bool irq_wake_up; |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 69 | bool cold_reset_rsp_pending; |
| 70 | uint8_t cold_reset_status; |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 71 | spinlock_t irq_enabled_lock; |
| 72 | unsigned int count_irq; |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 73 | /* NFC_IRQ Count */ |
| 74 | unsigned int dev_ref_count; |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 75 | /* Initial CORE RESET notification */ |
| 76 | unsigned int core_reset_ntf; |
| 77 | /* CLK control */ |
| 78 | bool clk_run; |
| 79 | struct clk *s_clk; |
| 80 | /* read buffer*/ |
| 81 | size_t kbuflen; |
| 82 | u8 *kbuf; |
| 83 | struct nqx_platform_data *pdata; |
| 84 | }; |
| 85 | |
| 86 | static int nfcc_reboot(struct notifier_block *notifier, unsigned long val, |
| 87 | void *v); |
| 88 | /*clock enable function*/ |
| 89 | static int nqx_clock_select(struct nqx_dev *nqx_dev); |
| 90 | /*clock disable function*/ |
| 91 | static int nqx_clock_deselect(struct nqx_dev *nqx_dev); |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 92 | static int nqx_standby_write(struct nqx_dev *nqx_dev, |
| 93 | const unsigned char *buf, size_t len); |
| 94 | |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 95 | static struct notifier_block nfcc_notifier = { |
| 96 | .notifier_call = nfcc_reboot, |
| 97 | .next = NULL, |
| 98 | .priority = 0 |
| 99 | }; |
| 100 | |
| 101 | unsigned int disable_ctrl; |
| 102 | |
| 103 | static void nqx_init_stat(struct nqx_dev *nqx_dev) |
| 104 | { |
| 105 | nqx_dev->count_irq = 0; |
| 106 | } |
| 107 | |
| 108 | static void nqx_disable_irq(struct nqx_dev *nqx_dev) |
| 109 | { |
| 110 | unsigned long flags; |
| 111 | |
| 112 | spin_lock_irqsave(&nqx_dev->irq_enabled_lock, flags); |
| 113 | if (nqx_dev->irq_enabled) { |
| 114 | disable_irq_nosync(nqx_dev->client->irq); |
| 115 | nqx_dev->irq_enabled = false; |
| 116 | } |
| 117 | spin_unlock_irqrestore(&nqx_dev->irq_enabled_lock, flags); |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * nqx_enable_irq() |
| 122 | * |
| 123 | * Check if interrupt is enabled or not |
| 124 | * and enable interrupt |
| 125 | * |
| 126 | * Return: void |
| 127 | */ |
| 128 | static void nqx_enable_irq(struct nqx_dev *nqx_dev) |
| 129 | { |
| 130 | unsigned long flags; |
| 131 | |
| 132 | spin_lock_irqsave(&nqx_dev->irq_enabled_lock, flags); |
| 133 | if (!nqx_dev->irq_enabled) { |
| 134 | nqx_dev->irq_enabled = true; |
| 135 | enable_irq(nqx_dev->client->irq); |
| 136 | } |
| 137 | spin_unlock_irqrestore(&nqx_dev->irq_enabled_lock, flags); |
| 138 | } |
| 139 | |
| 140 | static irqreturn_t nqx_dev_irq_handler(int irq, void *dev_id) |
| 141 | { |
| 142 | struct nqx_dev *nqx_dev = dev_id; |
| 143 | unsigned long flags; |
| 144 | |
| 145 | if (device_may_wakeup(&nqx_dev->client->dev)) |
| 146 | pm_wakeup_event(&nqx_dev->client->dev, WAKEUP_SRC_TIMEOUT); |
| 147 | |
| 148 | nqx_disable_irq(nqx_dev); |
| 149 | spin_lock_irqsave(&nqx_dev->irq_enabled_lock, flags); |
| 150 | nqx_dev->count_irq++; |
| 151 | spin_unlock_irqrestore(&nqx_dev->irq_enabled_lock, flags); |
| 152 | wake_up(&nqx_dev->read_wq); |
| 153 | |
| 154 | return IRQ_HANDLED; |
| 155 | } |
| 156 | |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 157 | static int is_data_available_for_read(struct nqx_dev *nqx_dev) |
| 158 | { |
| 159 | int ret; |
| 160 | |
| 161 | nqx_enable_irq(nqx_dev); |
| 162 | ret = wait_event_interruptible_timeout(nqx_dev->read_wq, |
| 163 | !nqx_dev->irq_enabled, msecs_to_jiffies(MAX_IRQ_WAIT_TIME)); |
| 164 | return ret; |
| 165 | } |
| 166 | |
| 167 | static int send_cold_reset_cmd(struct nqx_dev *nqx_dev) |
| 168 | { |
| 169 | int ret; |
| 170 | char *cold_reset_cmd = NULL; |
| 171 | |
| 172 | if (gpio_get_value(nqx_dev->firm_gpio)) { |
| 173 | dev_err(&nqx_dev->client->dev, "FW download in-progress\n"); |
| 174 | return -EBUSY; |
| 175 | } |
| 176 | if (!gpio_get_value(nqx_dev->en_gpio)) { |
| 177 | dev_err(&nqx_dev->client->dev, "VEN LOW - NFCC powered off\n"); |
| 178 | return -ENODEV; |
| 179 | } |
| 180 | cold_reset_cmd = kzalloc(COLD_RESET_CMD_LEN, GFP_DMA | GFP_KERNEL); |
| 181 | if (!cold_reset_cmd) |
| 182 | return -ENOMEM; |
| 183 | |
| 184 | cold_reset_cmd[0] = COLD_RESET_CMD_GID; |
| 185 | cold_reset_cmd[1] = COLD_RESET_OID; |
| 186 | cold_reset_cmd[2] = COLD_RESET_CMD_PAYLOAD_LEN; |
| 187 | |
| 188 | ret = nqx_standby_write(nqx_dev, cold_reset_cmd, COLD_RESET_CMD_LEN); |
| 189 | if (ret < 0) { |
| 190 | dev_err(&nqx_dev->client->dev, |
| 191 | "%s: write failed after max retry\n", __func__); |
| 192 | } |
| 193 | kfree(cold_reset_cmd); |
| 194 | return ret; |
| 195 | } |
| 196 | |
| 197 | static void read_cold_reset_rsp(struct nqx_dev *nqx_dev, bool isNfcEnabled, |
| 198 | char *header) |
| 199 | { |
| 200 | int ret = -1; |
| 201 | char *cold_reset_rsp = NULL; |
| 202 | |
| 203 | cold_reset_rsp = kzalloc(COLD_RESET_RSP_LEN, GFP_DMA | GFP_KERNEL); |
| 204 | if (!cold_reset_rsp) |
| 205 | return; |
| 206 | |
| 207 | /* |
| 208 | * read header also if NFC is disabled |
| 209 | * for enable case, will be taken care by nfc_read thread |
| 210 | */ |
| 211 | if (!isNfcEnabled) { |
| 212 | ret = i2c_master_recv(nqx_dev->client, cold_reset_rsp, |
| 213 | NCI_HEADER_LEN); |
| 214 | if (ret != NCI_HEADER_LEN) { |
| 215 | dev_err(&nqx_dev->client->dev, |
| 216 | "%s: failure to read cold reset rsp header\n", |
| 217 | __func__); |
| 218 | goto error; |
| 219 | } |
| 220 | } else { |
| 221 | memcpy(cold_reset_rsp, header, NCI_HEADER_LEN); |
| 222 | } |
| 223 | |
| 224 | if ((NCI_HEADER_LEN + cold_reset_rsp[2]) > COLD_RESET_RSP_LEN) { |
| 225 | dev_err(&nqx_dev->client->dev, |
| 226 | "%s: - invalid response for cold_reset\n", __func__); |
| 227 | ret = -EINVAL; |
| 228 | goto error; |
| 229 | } |
| 230 | ret = i2c_master_recv(nqx_dev->client, &cold_reset_rsp[NCI_PAYLOAD_IDX], |
| 231 | cold_reset_rsp[2]); |
| 232 | if (ret != cold_reset_rsp[2]) { |
| 233 | dev_err(&nqx_dev->client->dev, |
| 234 | "%s: failure to read cold reset rsp status\n", |
| 235 | __func__); |
| 236 | goto error; |
| 237 | } |
| 238 | nqx_dev->cold_reset_status = cold_reset_rsp[NCI_PAYLOAD_IDX]; |
| 239 | error: |
| 240 | kfree(cold_reset_rsp); |
| 241 | } |
| 242 | |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 243 | static ssize_t nfc_read(struct file *filp, char __user *buf, |
| 244 | size_t count, loff_t *offset) |
| 245 | { |
| 246 | struct nqx_dev *nqx_dev = filp->private_data; |
| 247 | unsigned char *tmp = NULL; |
| 248 | int ret; |
| 249 | int irq_gpio_val = 0; |
| 250 | |
| 251 | if (!nqx_dev) { |
| 252 | ret = -ENODEV; |
| 253 | goto out; |
| 254 | } |
| 255 | |
| 256 | if (count > nqx_dev->kbuflen) |
| 257 | count = nqx_dev->kbuflen; |
| 258 | |
| 259 | dev_dbg(&nqx_dev->client->dev, "%s : reading %zu bytes.\n", |
| 260 | __func__, count); |
| 261 | |
| 262 | mutex_lock(&nqx_dev->read_mutex); |
| 263 | |
| 264 | irq_gpio_val = gpio_get_value(nqx_dev->irq_gpio); |
| 265 | if (irq_gpio_val == 0) { |
| 266 | if (filp->f_flags & O_NONBLOCK) { |
| 267 | dev_err(&nqx_dev->client->dev, |
| 268 | ":f_falg has O_NONBLOCK. EAGAIN\n"); |
| 269 | ret = -EAGAIN; |
| 270 | goto err; |
| 271 | } |
| 272 | while (1) { |
| 273 | ret = 0; |
| 274 | if (!nqx_dev->irq_enabled) { |
| 275 | nqx_dev->irq_enabled = true; |
| 276 | enable_irq(nqx_dev->client->irq); |
| 277 | } |
| 278 | if (!gpio_get_value(nqx_dev->irq_gpio)) { |
| 279 | ret = wait_event_interruptible(nqx_dev->read_wq, |
| 280 | !nqx_dev->irq_enabled); |
| 281 | } |
| 282 | if (ret) |
| 283 | goto err; |
| 284 | nqx_disable_irq(nqx_dev); |
| 285 | |
| 286 | if (gpio_get_value(nqx_dev->irq_gpio)) |
| 287 | break; |
| 288 | dev_err_ratelimited(&nqx_dev->client->dev, |
| 289 | "gpio is low, no need to read data\n"); |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | tmp = nqx_dev->kbuf; |
| 294 | if (!tmp) { |
| 295 | dev_err(&nqx_dev->client->dev, |
| 296 | "%s: device doesn't exist anymore\n", __func__); |
| 297 | ret = -ENODEV; |
| 298 | goto err; |
| 299 | } |
| 300 | memset(tmp, 0x00, count); |
| 301 | |
| 302 | /* Read data */ |
| 303 | ret = i2c_master_recv(nqx_dev->client, tmp, count); |
| 304 | if (ret < 0) { |
| 305 | dev_err(&nqx_dev->client->dev, |
| 306 | "%s: i2c_master_recv returned %d\n", __func__, ret); |
| 307 | goto err; |
| 308 | } |
| 309 | if (ret > count) { |
| 310 | dev_err(&nqx_dev->client->dev, |
| 311 | "%s: received too many bytes from i2c (%d)\n", |
| 312 | __func__, ret); |
| 313 | ret = -EIO; |
| 314 | goto err; |
| 315 | } |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 316 | /* check if it's response of cold reset command |
| 317 | * NFC HAL process shouldn't receive this data as |
| 318 | * command was sent by eSE HAL |
| 319 | */ |
| 320 | if (nqx_dev->cold_reset_rsp_pending |
| 321 | && (tmp[0] == COLD_RESET_RSP_GID) |
| 322 | && (tmp[1] == COLD_RESET_OID)) { |
| 323 | read_cold_reset_rsp(nqx_dev, true, tmp); |
| 324 | nqx_dev->cold_reset_rsp_pending = false; |
| 325 | wake_up_interruptible(&nqx_dev->cold_reset_read_wq); |
| 326 | mutex_unlock(&nqx_dev->read_mutex); |
| 327 | /* |
| 328 | * NFC process doesn't know about cold reset command |
| 329 | * being sent as it was initiated by eSE process |
| 330 | * we shouldn't return any data to NFC process |
| 331 | */ |
| 332 | return 0; |
| 333 | } |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 334 | #ifdef NFC_KERNEL_BU |
| 335 | dev_dbg(&nqx_dev->client->dev, "%s : NfcNciRx %x %x %x\n", |
| 336 | __func__, tmp[0], tmp[1], tmp[2]); |
| 337 | #endif |
| 338 | if (copy_to_user(buf, tmp, ret)) { |
| 339 | dev_warn(&nqx_dev->client->dev, |
| 340 | "%s : failed to copy to user space\n", __func__); |
| 341 | ret = -EFAULT; |
| 342 | goto err; |
| 343 | } |
| 344 | mutex_unlock(&nqx_dev->read_mutex); |
| 345 | return ret; |
| 346 | |
| 347 | err: |
| 348 | mutex_unlock(&nqx_dev->read_mutex); |
| 349 | out: |
| 350 | return ret; |
| 351 | } |
| 352 | |
| 353 | static ssize_t nfc_write(struct file *filp, const char __user *buf, |
| 354 | size_t count, loff_t *offset) |
| 355 | { |
| 356 | struct nqx_dev *nqx_dev = filp->private_data; |
| 357 | char *tmp = NULL; |
| 358 | int ret = 0; |
| 359 | |
| 360 | if (!nqx_dev) { |
| 361 | ret = -ENODEV; |
| 362 | goto out; |
| 363 | } |
| 364 | if (count > nqx_dev->kbuflen) { |
| 365 | dev_err(&nqx_dev->client->dev, "%s: out of memory\n", |
| 366 | __func__); |
| 367 | ret = -ENOMEM; |
| 368 | goto out; |
| 369 | } |
| 370 | |
| 371 | tmp = memdup_user(buf, count); |
| 372 | if (IS_ERR(tmp)) { |
| 373 | dev_err(&nqx_dev->client->dev, "%s: memdup_user failed\n", |
| 374 | __func__); |
| 375 | ret = PTR_ERR(tmp); |
| 376 | goto out; |
| 377 | } |
| 378 | |
| 379 | ret = i2c_master_send(nqx_dev->client, tmp, count); |
| 380 | if (ret != count) { |
| 381 | dev_err(&nqx_dev->client->dev, |
| 382 | "%s: failed to write %d\n", __func__, ret); |
| 383 | ret = -EIO; |
| 384 | goto out_free; |
| 385 | } |
| 386 | #ifdef NFC_KERNEL_BU |
| 387 | dev_dbg(&nqx_dev->client->dev, |
| 388 | "%s : i2c-%d: NfcNciTx %x %x %x\n", |
| 389 | __func__, iminor(file_inode(filp)), |
| 390 | tmp[0], tmp[1], tmp[2]); |
| 391 | #endif |
| 392 | usleep_range(1000, 1100); |
| 393 | out_free: |
| 394 | kfree(tmp); |
| 395 | out: |
| 396 | return ret; |
| 397 | } |
| 398 | |
| 399 | /** |
| 400 | * nqx_standby_write() |
| 401 | * @buf: pointer to data buffer |
| 402 | * @len: # of bytes need to transfer |
| 403 | * |
| 404 | * write data buffer over I2C and retry |
| 405 | * if NFCC is in stand by mode |
| 406 | * |
| 407 | * Return: # of bytes written or -ve value in case of error |
| 408 | */ |
| 409 | static int nqx_standby_write(struct nqx_dev *nqx_dev, |
| 410 | const unsigned char *buf, size_t len) |
| 411 | { |
| 412 | int ret = -EINVAL; |
| 413 | int retry_cnt; |
| 414 | |
| 415 | for (retry_cnt = 1; retry_cnt <= MAX_RETRY_COUNT; retry_cnt++) { |
| 416 | ret = i2c_master_send(nqx_dev->client, buf, len); |
| 417 | if (ret < 0) { |
| 418 | dev_err(&nqx_dev->client->dev, |
| 419 | "%s: write failed, Maybe in Standby Mode - Retry(%d)\n", |
| 420 | __func__, retry_cnt); |
| 421 | usleep_range(1000, 1100); |
| 422 | } else if (ret == len) |
| 423 | break; |
| 424 | } |
| 425 | return ret; |
| 426 | } |
| 427 | |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 428 | |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 429 | /* |
Bhuvan Varshney | f1684bb | 2019-01-03 21:17:45 +0530 | [diff] [blame] | 430 | * Power management of the SN100 eSE |
| 431 | * eSE and NFCC both are powered using VEN gpio in SN100, |
| 432 | * VEN HIGH - eSE and NFCC both are powered on |
| 433 | * VEN LOW - eSE and NFCC both are power down |
| 434 | */ |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 435 | |
Bhuvan Varshney | f1684bb | 2019-01-03 21:17:45 +0530 | [diff] [blame] | 436 | static int sn100_ese_pwr(struct nqx_dev *nqx_dev, unsigned long arg) |
| 437 | { |
| 438 | int r = -1; |
| 439 | |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 440 | if (arg == ESE_POWER_ON) { |
Bhuvan Varshney | f1684bb | 2019-01-03 21:17:45 +0530 | [diff] [blame] | 441 | /** |
| 442 | * Let's store the NFC VEN pin state |
| 443 | * will check stored value in case of eSE power off request, |
| 444 | * to find out if NFC MW also sent request to set VEN HIGH |
| 445 | * VEN state will remain HIGH if NFC is enabled otherwise |
| 446 | * it will be set as LOW |
| 447 | */ |
| 448 | nqx_dev->nfc_ven_enabled = |
| 449 | gpio_get_value(nqx_dev->en_gpio); |
| 450 | if (!nqx_dev->nfc_ven_enabled) { |
| 451 | dev_dbg(&nqx_dev->client->dev, "eSE HAL service setting en_gpio HIGH\n"); |
| 452 | gpio_set_value(nqx_dev->en_gpio, 1); |
| 453 | /* hardware dependent delay */ |
| 454 | usleep_range(1000, 1100); |
| 455 | } else { |
| 456 | dev_dbg(&nqx_dev->client->dev, "en_gpio already HIGH\n"); |
| 457 | } |
| 458 | r = 0; |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 459 | } else if (arg == ESE_POWER_OFF) { |
Bhuvan Varshney | f1684bb | 2019-01-03 21:17:45 +0530 | [diff] [blame] | 460 | if (!nqx_dev->nfc_ven_enabled) { |
| 461 | dev_dbg(&nqx_dev->client->dev, "NFC not enabled, disabling en_gpio\n"); |
| 462 | gpio_set_value(nqx_dev->en_gpio, 0); |
| 463 | /* hardware dependent delay */ |
| 464 | usleep_range(1000, 1100); |
| 465 | } else { |
| 466 | dev_dbg(&nqx_dev->client->dev, "keep en_gpio high as NFC is enabled\n"); |
| 467 | } |
| 468 | r = 0; |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 469 | } else if (arg == ESE_COLD_RESET) { |
| 470 | // set default value for status as failure |
| 471 | nqx_dev->cold_reset_status = EIO; |
| 472 | |
| 473 | r = send_cold_reset_cmd(nqx_dev); |
| 474 | if (r <= 0) { |
| 475 | dev_err(&nqx_dev->client->dev, |
| 476 | "failed to send cold reset command\n"); |
| 477 | return nqx_dev->cold_reset_status; |
| 478 | } |
| 479 | nqx_dev->cold_reset_rsp_pending = true; |
| 480 | // check if NFC is enabled |
| 481 | if (nqx_dev->nfc_enabled) { |
| 482 | /* |
| 483 | * nfc_read thread will initiate cold reset response |
| 484 | * and it will signal for data available |
| 485 | */ |
| 486 | wait_event_interruptible(nqx_dev->cold_reset_read_wq, |
| 487 | !nqx_dev->cold_reset_rsp_pending); |
| 488 | } else { |
| 489 | /* |
| 490 | * Read data as NFC thread is not active |
| 491 | */ |
| 492 | r = is_data_available_for_read(nqx_dev); |
| 493 | if (r <= 0) { |
| 494 | nqx_disable_irq(nqx_dev); |
| 495 | nqx_dev->cold_reset_rsp_pending = false; |
| 496 | return nqx_dev->cold_reset_status; |
| 497 | } |
| 498 | read_cold_reset_rsp(nqx_dev, false, NULL); |
| 499 | nqx_dev->cold_reset_rsp_pending = false; |
| 500 | } |
| 501 | r = nqx_dev->cold_reset_status; |
| 502 | } else if (arg == ESE_POWER_STATE) { |
Bhuvan Varshney | f1684bb | 2019-01-03 21:17:45 +0530 | [diff] [blame] | 503 | // eSE power state |
| 504 | r = gpio_get_value(nqx_dev->en_gpio); |
| 505 | } |
| 506 | return r; |
| 507 | } |
| 508 | |
| 509 | /* |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 510 | * Power management of the eSE |
| 511 | * NFC & eSE ON : NFC_EN high and eSE_pwr_req high. |
| 512 | * NFC OFF & eSE ON : NFC_EN high and eSE_pwr_req high. |
| 513 | * NFC OFF & eSE OFF : NFC_EN low and eSE_pwr_req low. |
| 514 | */ |
| 515 | static int nqx_ese_pwr(struct nqx_dev *nqx_dev, unsigned long arg) |
| 516 | { |
| 517 | int r = -1; |
| 518 | const unsigned char svdd_off_cmd_warn[] = {0x2F, 0x31, 0x01, 0x01}; |
| 519 | const unsigned char svdd_off_cmd_done[] = {0x2F, 0x31, 0x01, 0x00}; |
| 520 | |
| 521 | if (!gpio_is_valid(nqx_dev->ese_gpio)) { |
| 522 | dev_err(&nqx_dev->client->dev, |
| 523 | "%s: ese_gpio is not valid\n", __func__); |
| 524 | return -EINVAL; |
| 525 | } |
| 526 | |
| 527 | if (arg == 0) { |
| 528 | /* |
| 529 | * We want to power on the eSE and to do so we need the |
| 530 | * eSE_pwr_req pin and the NFC_EN pin to be high |
| 531 | */ |
| 532 | if (gpio_get_value(nqx_dev->ese_gpio)) { |
| 533 | dev_dbg(&nqx_dev->client->dev, "ese_gpio is already high\n"); |
| 534 | r = 0; |
| 535 | } else { |
| 536 | /** |
| 537 | * Let's store the NFC_EN pin state |
| 538 | * only if the eSE is not yet on |
| 539 | */ |
| 540 | nqx_dev->nfc_ven_enabled = |
| 541 | gpio_get_value(nqx_dev->en_gpio); |
| 542 | if (!nqx_dev->nfc_ven_enabled) { |
| 543 | gpio_set_value(nqx_dev->en_gpio, 1); |
| 544 | /* hardware dependent delay */ |
| 545 | usleep_range(1000, 1100); |
| 546 | } |
| 547 | gpio_set_value(nqx_dev->ese_gpio, 1); |
| 548 | usleep_range(1000, 1100); |
| 549 | if (gpio_get_value(nqx_dev->ese_gpio)) { |
| 550 | dev_dbg(&nqx_dev->client->dev, "ese_gpio is enabled\n"); |
| 551 | r = 0; |
| 552 | } |
| 553 | } |
| 554 | } else if (arg == 1) { |
| 555 | if (nqx_dev->nfc_ven_enabled && |
| 556 | ((nqx_dev->nqx_info.info.chip_type == NFCC_NQ_220) || |
| 557 | (nqx_dev->nqx_info.info.chip_type == NFCC_PN66T))) { |
| 558 | /** |
| 559 | * Let's inform the CLF we're |
| 560 | * powering off the eSE |
| 561 | */ |
| 562 | r = nqx_standby_write(nqx_dev, svdd_off_cmd_warn, |
| 563 | sizeof(svdd_off_cmd_warn)); |
| 564 | if (r < 0) { |
| 565 | dev_err(&nqx_dev->client->dev, |
| 566 | "%s: write failed after max retry\n", |
| 567 | __func__); |
| 568 | return -ENXIO; |
| 569 | } |
| 570 | dev_dbg(&nqx_dev->client->dev, |
| 571 | "%s: svdd_off_cmd_warn sent\n", __func__); |
| 572 | |
| 573 | /* let's power down the eSE */ |
| 574 | gpio_set_value(nqx_dev->ese_gpio, 0); |
| 575 | dev_dbg(&nqx_dev->client->dev, |
| 576 | "%s: nqx_dev->ese_gpio set to 0\n", __func__); |
| 577 | |
| 578 | /** |
| 579 | * Time needed for the SVDD capacitor |
| 580 | * to get discharged |
| 581 | */ |
| 582 | usleep_range(8000, 8100); |
| 583 | |
| 584 | /* Let's inform the CLF the eSE is now off */ |
| 585 | r = nqx_standby_write(nqx_dev, svdd_off_cmd_done, |
| 586 | sizeof(svdd_off_cmd_done)); |
| 587 | if (r < 0) { |
| 588 | dev_err(&nqx_dev->client->dev, |
| 589 | "%s: write failed after max retry\n", |
| 590 | __func__); |
| 591 | return -ENXIO; |
| 592 | } |
| 593 | dev_dbg(&nqx_dev->client->dev, |
| 594 | "%s: svdd_off_cmd_done sent\n", __func__); |
| 595 | } else { |
| 596 | /** |
| 597 | * In case the NFC is off, |
| 598 | * there's no need to send the i2c commands |
| 599 | */ |
| 600 | gpio_set_value(nqx_dev->ese_gpio, 0); |
| 601 | usleep_range(1000, 1100); |
| 602 | } |
| 603 | |
| 604 | if (!gpio_get_value(nqx_dev->ese_gpio)) { |
| 605 | dev_dbg(&nqx_dev->client->dev, "ese_gpio is disabled\n"); |
| 606 | r = 0; |
| 607 | } |
| 608 | |
| 609 | if (!nqx_dev->nfc_ven_enabled) { |
| 610 | /* hardware dependent delay */ |
| 611 | usleep_range(1000, 1100); |
| 612 | dev_dbg(&nqx_dev->client->dev, "disabling en_gpio\n"); |
| 613 | gpio_set_value(nqx_dev->en_gpio, 0); |
| 614 | } |
| 615 | } else if (arg == 3) { |
| 616 | r = gpio_get_value(nqx_dev->ese_gpio); |
| 617 | } |
| 618 | return r; |
| 619 | } |
| 620 | |
| 621 | static int nfc_open(struct inode *inode, struct file *filp) |
| 622 | { |
| 623 | struct nqx_dev *nqx_dev = container_of(inode->i_cdev, |
| 624 | struct nqx_dev, c_dev); |
| 625 | |
| 626 | filp->private_data = nqx_dev; |
| 627 | nqx_init_stat(nqx_dev); |
| 628 | |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 629 | mutex_lock(&nqx_dev->dev_ref_mutex); |
| 630 | |
| 631 | if (nqx_dev->dev_ref_count == 0) { |
| 632 | nqx_enable_irq(nqx_dev); |
| 633 | |
| 634 | if (gpio_is_valid(nqx_dev->firm_gpio)) { |
| 635 | gpio_set_value(nqx_dev->firm_gpio, 0); |
| 636 | usleep_range(10000, 10100); |
| 637 | } |
| 638 | } |
| 639 | |
| 640 | nqx_dev->dev_ref_count = nqx_dev->dev_ref_count + 1; |
| 641 | |
| 642 | mutex_unlock(&nqx_dev->dev_ref_mutex); |
| 643 | |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 644 | dev_dbg(&nqx_dev->client->dev, |
| 645 | "%s: %d,%d\n", __func__, imajor(inode), iminor(inode)); |
| 646 | return 0; |
| 647 | } |
| 648 | |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 649 | static int nfc_close(struct inode *inode, struct file *filp) |
| 650 | { |
| 651 | struct nqx_dev *nqx_dev = container_of(inode->i_cdev, |
| 652 | struct nqx_dev, c_dev); |
| 653 | |
| 654 | mutex_lock(&nqx_dev->dev_ref_mutex); |
| 655 | |
| 656 | if (nqx_dev->dev_ref_count == 1) { |
| 657 | nqx_disable_irq(nqx_dev); |
| 658 | |
| 659 | if (gpio_is_valid(nqx_dev->firm_gpio)) { |
| 660 | gpio_set_value(nqx_dev->firm_gpio, 0); |
| 661 | usleep_range(10000, 10100); |
| 662 | } |
| 663 | } |
| 664 | |
| 665 | if (nqx_dev->dev_ref_count > 0) |
| 666 | nqx_dev->dev_ref_count = nqx_dev->dev_ref_count - 1; |
| 667 | |
| 668 | mutex_unlock(&nqx_dev->dev_ref_mutex); |
| 669 | |
| 670 | filp->private_data = NULL; |
| 671 | |
| 672 | return 0; |
| 673 | } |
| 674 | |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 675 | /* |
| 676 | * nfc_ioctl_power_states() - power control |
| 677 | * @filp: pointer to the file descriptor |
| 678 | * @arg: mode that we want to move to |
| 679 | * |
| 680 | * Device power control. Depending on the arg value, device moves to |
| 681 | * different states |
| 682 | * (arg = 0): NFC_ENABLE GPIO = 0, FW_DL GPIO = 0 |
| 683 | * (arg = 1): NFC_ENABLE GPIO = 1, FW_DL GPIO = 0 |
| 684 | * (arg = 2): FW_DL GPIO = 1 |
| 685 | * |
| 686 | * Return: -ENOIOCTLCMD if arg is not supported, 0 in any other case |
| 687 | */ |
| 688 | int nfc_ioctl_power_states(struct file *filp, unsigned long arg) |
| 689 | { |
| 690 | int r = 0; |
| 691 | struct nqx_dev *nqx_dev = filp->private_data; |
| 692 | |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 693 | if (arg == NFC_POWER_OFF) { |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 694 | /* |
| 695 | * We are attempting a hardware reset so let us disable |
| 696 | * interrupts to avoid spurious notifications to upper |
| 697 | * layers. |
| 698 | */ |
| 699 | nqx_disable_irq(nqx_dev); |
| 700 | dev_dbg(&nqx_dev->client->dev, |
| 701 | "gpio_set_value disable: %s: info: %p\n", |
| 702 | __func__, nqx_dev); |
| 703 | if (gpio_is_valid(nqx_dev->firm_gpio)) { |
| 704 | gpio_set_value(nqx_dev->firm_gpio, 0); |
| 705 | usleep_range(10000, 10100); |
| 706 | } |
| 707 | |
| 708 | if (gpio_is_valid(nqx_dev->ese_gpio)) { |
| 709 | if (!gpio_get_value(nqx_dev->ese_gpio)) { |
| 710 | dev_dbg(&nqx_dev->client->dev, "disabling en_gpio\n"); |
| 711 | gpio_set_value(nqx_dev->en_gpio, 0); |
| 712 | usleep_range(10000, 10100); |
| 713 | } else { |
| 714 | dev_dbg(&nqx_dev->client->dev, "keeping en_gpio high\n"); |
| 715 | } |
| 716 | } else { |
| 717 | dev_dbg(&nqx_dev->client->dev, "ese_gpio invalid, set en_gpio to low\n"); |
| 718 | gpio_set_value(nqx_dev->en_gpio, 0); |
| 719 | usleep_range(10000, 10100); |
| 720 | } |
| 721 | if (nqx_dev->pdata->clk_pin_voting) { |
| 722 | r = nqx_clock_deselect(nqx_dev); |
| 723 | if (r < 0) |
| 724 | dev_err(&nqx_dev->client->dev, "unable to disable clock\n"); |
| 725 | } |
| 726 | nqx_dev->nfc_ven_enabled = false; |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 727 | } else if (arg == NFC_POWER_ON) { |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 728 | nqx_enable_irq(nqx_dev); |
| 729 | dev_dbg(&nqx_dev->client->dev, |
| 730 | "gpio_set_value enable: %s: info: %p\n", |
| 731 | __func__, nqx_dev); |
| 732 | if (gpio_is_valid(nqx_dev->firm_gpio)) { |
| 733 | gpio_set_value(nqx_dev->firm_gpio, 0); |
| 734 | usleep_range(10000, 10100); |
| 735 | } |
| 736 | gpio_set_value(nqx_dev->en_gpio, 1); |
| 737 | usleep_range(10000, 10100); |
| 738 | if (nqx_dev->pdata->clk_pin_voting) { |
| 739 | r = nqx_clock_select(nqx_dev); |
| 740 | if (r < 0) |
| 741 | dev_err(&nqx_dev->client->dev, "unable to enable clock\n"); |
| 742 | } |
| 743 | nqx_dev->nfc_ven_enabled = true; |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 744 | } else if (arg == NFC_FW_DWL_VEN_TOGGLE) { |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 745 | /* |
| 746 | * We are switching to Dowload Mode, toggle the enable pin |
| 747 | * in order to set the NFCC in the new mode |
| 748 | */ |
| 749 | if (gpio_is_valid(nqx_dev->ese_gpio)) { |
| 750 | if (gpio_get_value(nqx_dev->ese_gpio)) { |
| 751 | dev_err(&nqx_dev->client->dev, |
| 752 | "FW download forbidden while ese is on\n"); |
| 753 | return -EBUSY; /* Device or resource busy */ |
| 754 | } |
| 755 | } |
| 756 | gpio_set_value(nqx_dev->en_gpio, 1); |
| 757 | usleep_range(10000, 10100); |
| 758 | if (gpio_is_valid(nqx_dev->firm_gpio)) { |
| 759 | gpio_set_value(nqx_dev->firm_gpio, 1); |
| 760 | usleep_range(10000, 10100); |
| 761 | } |
| 762 | gpio_set_value(nqx_dev->en_gpio, 0); |
| 763 | usleep_range(10000, 10100); |
| 764 | gpio_set_value(nqx_dev->en_gpio, 1); |
| 765 | usleep_range(10000, 10100); |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 766 | } else if (arg == NFC_FW_DWL_HIGH) { |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 767 | /* |
| 768 | * Setting firmware download gpio to HIGH for SN100U |
| 769 | * before FW download start |
| 770 | */ |
| 771 | dev_dbg(&nqx_dev->client->dev, "SN100 fw gpio HIGH\n"); |
| 772 | if (gpio_is_valid(nqx_dev->firm_gpio)) { |
| 773 | gpio_set_value(nqx_dev->firm_gpio, 1); |
| 774 | usleep_range(10000, 10100); |
| 775 | } else |
| 776 | dev_err(&nqx_dev->client->dev, |
| 777 | "firm_gpio is invalid\n"); |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 778 | } else if (arg == NFC_FW_DWL_LOW) { |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 779 | /* |
| 780 | * Setting firmware download gpio to LOW for SN100U |
| 781 | * FW download finished |
| 782 | */ |
| 783 | dev_dbg(&nqx_dev->client->dev, "SN100 fw gpio LOW\n"); |
| 784 | if (gpio_is_valid(nqx_dev->firm_gpio)) { |
| 785 | gpio_set_value(nqx_dev->firm_gpio, 0); |
| 786 | usleep_range(10000, 10100); |
| 787 | } else { |
| 788 | dev_err(&nqx_dev->client->dev, |
| 789 | "firm_gpio is invalid\n"); |
| 790 | } |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 791 | } else if (arg == NFC_ENABLE) { |
| 792 | /* |
| 793 | * Setting flag true when NFC is enabled |
| 794 | */ |
| 795 | nqx_dev->nfc_enabled = true; |
| 796 | } else if (arg == NFC_DISABLE) { |
| 797 | /* |
| 798 | * Setting flag false when NFC is disabled |
| 799 | */ |
| 800 | nqx_dev->nfc_enabled = false; |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 801 | } else { |
| 802 | r = -ENOIOCTLCMD; |
| 803 | } |
| 804 | |
| 805 | return r; |
| 806 | } |
| 807 | |
| 808 | #ifdef CONFIG_COMPAT |
| 809 | static long nfc_compat_ioctl(struct file *pfile, unsigned int cmd, |
| 810 | unsigned long arg) |
| 811 | { |
| 812 | long r = 0; |
| 813 | |
| 814 | arg = (compat_u64)arg; |
| 815 | switch (cmd) { |
| 816 | case NFC_SET_PWR: |
| 817 | nfc_ioctl_power_states(pfile, arg); |
| 818 | break; |
| 819 | case ESE_SET_PWR: |
| 820 | nqx_ese_pwr(pfile->private_data, arg); |
| 821 | break; |
| 822 | case ESE_GET_PWR: |
| 823 | nqx_ese_pwr(pfile->private_data, 3); |
| 824 | break; |
| 825 | case SET_RX_BLOCK: |
| 826 | break; |
| 827 | case SET_EMULATOR_TEST_POINT: |
| 828 | break; |
| 829 | default: |
| 830 | r = -ENOTTY; |
| 831 | } |
| 832 | return r; |
| 833 | } |
| 834 | #endif |
| 835 | |
| 836 | /* |
| 837 | * nfc_ioctl_core_reset_ntf() |
| 838 | * @filp: pointer to the file descriptor |
| 839 | * |
| 840 | * Allows callers to determine if a CORE_RESET_NTF has arrived |
| 841 | * |
| 842 | * Return: the value of variable core_reset_ntf |
| 843 | */ |
| 844 | int nfc_ioctl_core_reset_ntf(struct file *filp) |
| 845 | { |
| 846 | struct nqx_dev *nqx_dev = filp->private_data; |
| 847 | |
| 848 | dev_dbg(&nqx_dev->client->dev, "%s: returning = %d\n", __func__, |
| 849 | nqx_dev->core_reset_ntf); |
| 850 | return nqx_dev->core_reset_ntf; |
| 851 | } |
| 852 | |
| 853 | /* |
| 854 | * Inside nfc_ioctl_nfcc_info |
| 855 | * |
| 856 | * @brief nfc_ioctl_nfcc_info |
| 857 | * |
| 858 | * Check the NQ Chipset and firmware version details |
| 859 | */ |
| 860 | unsigned int nfc_ioctl_nfcc_info(struct file *filp, unsigned long arg) |
| 861 | { |
| 862 | unsigned int r = 0; |
| 863 | struct nqx_dev *nqx_dev = filp->private_data; |
| 864 | |
| 865 | r = nqx_dev->nqx_info.i; |
| 866 | dev_dbg(&nqx_dev->client->dev, |
| 867 | "nqx nfc : %s r = %d\n", __func__, r); |
| 868 | |
| 869 | return r; |
| 870 | } |
| 871 | |
| 872 | static long nfc_ioctl(struct file *pfile, unsigned int cmd, |
| 873 | unsigned long arg) |
| 874 | { |
| 875 | int r = 0; |
Bhuvan Varshney | f1684bb | 2019-01-03 21:17:45 +0530 | [diff] [blame] | 876 | struct nqx_dev *nqx_dev = pfile->private_data; |
| 877 | |
| 878 | if (!nqx_dev) |
| 879 | return -ENODEV; |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 880 | |
| 881 | switch (cmd) { |
| 882 | case NFC_SET_PWR: |
| 883 | r = nfc_ioctl_power_states(pfile, arg); |
| 884 | break; |
| 885 | case ESE_SET_PWR: |
Bhuvan Varshney | f1684bb | 2019-01-03 21:17:45 +0530 | [diff] [blame] | 886 | if ((nqx_dev->nqx_info.info.chip_type == NFCC_SN100_A) || |
| 887 | (nqx_dev->nqx_info.info.chip_type == NFCC_SN100_B)) |
| 888 | r = sn100_ese_pwr(nqx_dev, arg); |
| 889 | else |
| 890 | r = nqx_ese_pwr(nqx_dev, arg); |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 891 | break; |
| 892 | case ESE_GET_PWR: |
Bhuvan Varshney | f1684bb | 2019-01-03 21:17:45 +0530 | [diff] [blame] | 893 | if ((nqx_dev->nqx_info.info.chip_type == NFCC_SN100_A) || |
| 894 | (nqx_dev->nqx_info.info.chip_type == NFCC_SN100_B)) |
| 895 | r = sn100_ese_pwr(nqx_dev, 3); |
| 896 | else |
| 897 | r = nqx_ese_pwr(nqx_dev, 3); |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 898 | break; |
| 899 | case SET_RX_BLOCK: |
| 900 | break; |
| 901 | case SET_EMULATOR_TEST_POINT: |
| 902 | break; |
| 903 | case NFCC_INITIAL_CORE_RESET_NTF: |
| 904 | r = nfc_ioctl_core_reset_ntf(pfile); |
| 905 | break; |
| 906 | case NFCC_GET_INFO: |
| 907 | r = nfc_ioctl_nfcc_info(pfile, arg); |
| 908 | break; |
| 909 | default: |
| 910 | r = -ENOIOCTLCMD; |
| 911 | } |
| 912 | return r; |
| 913 | } |
| 914 | |
| 915 | static const struct file_operations nfc_dev_fops = { |
| 916 | .owner = THIS_MODULE, |
| 917 | .llseek = no_llseek, |
| 918 | .read = nfc_read, |
| 919 | .write = nfc_write, |
| 920 | .open = nfc_open, |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 921 | .release = nfc_close, |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 922 | .unlocked_ioctl = nfc_ioctl, |
| 923 | #ifdef CONFIG_COMPAT |
| 924 | .compat_ioctl = nfc_compat_ioctl |
| 925 | #endif |
| 926 | }; |
| 927 | |
| 928 | /* Check for availability of NQ_ NFC controller hardware */ |
| 929 | static int nfcc_hw_check(struct i2c_client *client, struct nqx_dev *nqx_dev) |
| 930 | { |
| 931 | int ret = 0; |
| 932 | |
| 933 | int gpio_retry_count = 0; |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 934 | unsigned char reset_ntf_len = 0; |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 935 | unsigned int enable_gpio = nqx_dev->en_gpio; |
| 936 | char *nci_reset_cmd = NULL; |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 937 | char *nci_reset_rsp = NULL; |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 938 | char *nci_reset_ntf = NULL; |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 939 | char *nci_get_version_cmd = NULL; |
| 940 | char *nci_get_version_rsp = NULL; |
| 941 | |
| 942 | nci_reset_cmd = kzalloc(NCI_RESET_CMD_LEN + 1, GFP_DMA | GFP_KERNEL); |
| 943 | if (!nci_reset_cmd) { |
| 944 | ret = -ENOMEM; |
| 945 | goto done; |
| 946 | } |
| 947 | |
| 948 | nci_reset_rsp = kzalloc(NCI_RESET_RSP_LEN + 1, GFP_DMA | GFP_KERNEL); |
| 949 | if (!nci_reset_rsp) { |
| 950 | ret = -ENOMEM; |
| 951 | goto done; |
| 952 | } |
| 953 | |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 954 | nci_reset_ntf = kzalloc(NCI_RESET_NTF_LEN + 1, GFP_DMA | GFP_KERNEL); |
Tapas Dey | 5a881e2 | 2019-08-26 12:48:53 +0530 | [diff] [blame] | 955 | if (!nci_reset_ntf) { |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 956 | ret = -ENOMEM; |
| 957 | goto done; |
| 958 | } |
| 959 | |
| 960 | nci_get_version_cmd = kzalloc(NCI_GET_VERSION_CMD_LEN + 1, |
| 961 | GFP_DMA | GFP_KERNEL); |
| 962 | if (!nci_get_version_cmd) { |
| 963 | ret = -ENOMEM; |
| 964 | goto done; |
| 965 | } |
| 966 | |
| 967 | nci_get_version_rsp = kzalloc(NCI_GET_VERSION_RSP_LEN + 1, |
| 968 | GFP_DMA | GFP_KERNEL); |
| 969 | if (!nci_get_version_rsp) { |
| 970 | ret = -ENOMEM; |
| 971 | goto done; |
| 972 | } |
| 973 | |
| 974 | reset_enable_gpio: |
| 975 | /* making sure that the NFCC starts in a clean state. */ |
Bhuvan Varshney | 0421fe11 | 2019-06-17 18:41:54 +0530 | [diff] [blame] | 976 | gpio_set_value(enable_gpio, 1);/* HPD : Enable*/ |
| 977 | /* hardware dependent delay */ |
| 978 | usleep_range(10000, 10100); |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 979 | gpio_set_value(enable_gpio, 0);/* ULPM: Disable */ |
| 980 | /* hardware dependent delay */ |
| 981 | usleep_range(10000, 10100); |
| 982 | gpio_set_value(enable_gpio, 1);/* HPD : Enable*/ |
| 983 | /* hardware dependent delay */ |
| 984 | usleep_range(10000, 10100); |
| 985 | |
| 986 | nci_reset_cmd[0] = 0x20; |
| 987 | nci_reset_cmd[1] = 0x00; |
| 988 | nci_reset_cmd[2] = 0x01; |
| 989 | nci_reset_cmd[3] = 0x00; |
| 990 | /* send NCI CORE RESET CMD with Keep Config parameters */ |
| 991 | ret = i2c_master_send(client, nci_reset_cmd, NCI_RESET_CMD_LEN); |
| 992 | if (ret < 0) { |
| 993 | dev_err(&client->dev, |
| 994 | "%s: - i2c_master_send core reset Error\n", __func__); |
| 995 | |
| 996 | if (gpio_is_valid(nqx_dev->firm_gpio)) { |
| 997 | gpio_set_value(nqx_dev->firm_gpio, 1); |
| 998 | usleep_range(10000, 10100); |
| 999 | } |
| 1000 | gpio_set_value(nqx_dev->en_gpio, 0); |
| 1001 | usleep_range(10000, 10100); |
| 1002 | gpio_set_value(nqx_dev->en_gpio, 1); |
| 1003 | usleep_range(10000, 10100); |
| 1004 | |
| 1005 | nci_get_version_cmd[0] = 0x00; |
| 1006 | nci_get_version_cmd[1] = 0x04; |
| 1007 | nci_get_version_cmd[2] = 0xF1; |
| 1008 | nci_get_version_cmd[3] = 0x00; |
| 1009 | nci_get_version_cmd[4] = 0x00; |
| 1010 | nci_get_version_cmd[5] = 0x00; |
| 1011 | nci_get_version_cmd[6] = 0x6E; |
| 1012 | nci_get_version_cmd[7] = 0xEF; |
| 1013 | ret = i2c_master_send(client, nci_get_version_cmd, |
| 1014 | NCI_GET_VERSION_CMD_LEN); |
| 1015 | |
| 1016 | if (ret < 0) { |
| 1017 | dev_err(&client->dev, |
| 1018 | "%s: - i2c_master_send get version cmd Error\n", |
| 1019 | __func__); |
| 1020 | goto err_nfcc_hw_check; |
| 1021 | } |
| 1022 | /* hardware dependent delay */ |
| 1023 | usleep_range(10000, 10100); |
| 1024 | |
| 1025 | ret = i2c_master_recv(client, nci_get_version_rsp, |
| 1026 | NCI_GET_VERSION_RSP_LEN); |
| 1027 | if (ret < 0) { |
| 1028 | dev_err(&client->dev, |
| 1029 | "%s: - i2c_master_recv get version rsp Error\n", |
| 1030 | __func__); |
| 1031 | goto err_nfcc_hw_check; |
| 1032 | } else { |
| 1033 | nqx_dev->nqx_info.info.chip_type = |
| 1034 | nci_get_version_rsp[3]; |
| 1035 | nqx_dev->nqx_info.info.rom_version = |
| 1036 | nci_get_version_rsp[4]; |
| 1037 | nqx_dev->nqx_info.info.fw_minor = |
| 1038 | nci_get_version_rsp[6]; |
| 1039 | nqx_dev->nqx_info.info.fw_major = |
| 1040 | nci_get_version_rsp[7]; |
| 1041 | } |
| 1042 | goto err_nfcc_reset_failed; |
| 1043 | } |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 1044 | |
| 1045 | ret = is_data_available_for_read(nqx_dev); |
Karthik Poosa | 9681a3d | 2019-07-17 11:59:30 +0530 | [diff] [blame] | 1046 | if (ret <= 0) { |
Bhuvan Varshney | 0421fe11 | 2019-06-17 18:41:54 +0530 | [diff] [blame] | 1047 | nqx_disable_irq(nqx_dev); |
| 1048 | goto err_nfcc_hw_check; |
| 1049 | } |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1050 | |
| 1051 | /* Read Response of RESET command */ |
| 1052 | ret = i2c_master_recv(client, nci_reset_rsp, NCI_RESET_RSP_LEN); |
| 1053 | if (ret < 0) { |
| 1054 | dev_err(&client->dev, |
| 1055 | "%s: - i2c_master_recv Error\n", __func__); |
| 1056 | gpio_retry_count = gpio_retry_count + 1; |
| 1057 | if (gpio_retry_count < MAX_RETRY_COUNT) |
| 1058 | goto reset_enable_gpio; |
| 1059 | goto err_nfcc_hw_check; |
| 1060 | } |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 1061 | |
| 1062 | ret = is_data_available_for_read(nqx_dev); |
Karthik Poosa | 9681a3d | 2019-07-17 11:59:30 +0530 | [diff] [blame] | 1063 | if (ret <= 0) { |
Bhuvan Varshney | 0421fe11 | 2019-06-17 18:41:54 +0530 | [diff] [blame] | 1064 | nqx_disable_irq(nqx_dev); |
| 1065 | goto err_nfcc_hw_check; |
| 1066 | } |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 1067 | |
| 1068 | /* Read Notification of RESET command */ |
| 1069 | ret = i2c_master_recv(client, nci_reset_ntf, NCI_RESET_NTF_LEN); |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1070 | if (ret < 0) { |
| 1071 | dev_err(&client->dev, |
| 1072 | "%s: - i2c_master_recv Error\n", __func__); |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 1073 | goto err_nfcc_hw_check; |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1074 | } |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 1075 | |
| 1076 | reset_ntf_len = 2 + nci_reset_ntf[2]; /*payload + len*/ |
| 1077 | if (reset_ntf_len > PAYLOAD_HEADER_LENGTH) { |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1078 | nqx_dev->nqx_info.info.chip_type = |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 1079 | nci_reset_ntf[reset_ntf_len - 3]; |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1080 | nqx_dev->nqx_info.info.rom_version = |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 1081 | nci_reset_ntf[reset_ntf_len - 2]; |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1082 | nqx_dev->nqx_info.info.fw_major = |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 1083 | nci_reset_ntf[reset_ntf_len - 1]; |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1084 | nqx_dev->nqx_info.info.fw_minor = |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 1085 | nci_reset_ntf[reset_ntf_len]; |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1086 | } |
| 1087 | dev_dbg(&client->dev, |
| 1088 | "%s: - nq - reset cmd answer : NfcNciRx %x %x %x\n", |
| 1089 | __func__, nci_reset_rsp[0], |
| 1090 | nci_reset_rsp[1], nci_reset_rsp[2]); |
| 1091 | |
| 1092 | err_nfcc_reset_failed: |
| 1093 | dev_dbg(&nqx_dev->client->dev, "NQ NFCC chip_type = %x\n", |
| 1094 | nqx_dev->nqx_info.info.chip_type); |
| 1095 | dev_dbg(&nqx_dev->client->dev, "NQ fw version = %x.%x.%x\n", |
| 1096 | nqx_dev->nqx_info.info.rom_version, |
| 1097 | nqx_dev->nqx_info.info.fw_major, |
| 1098 | nqx_dev->nqx_info.info.fw_minor); |
| 1099 | |
| 1100 | switch (nqx_dev->nqx_info.info.chip_type) { |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1101 | case NFCC_NQ_310: |
| 1102 | dev_dbg(&client->dev, |
| 1103 | "%s: ## NFCC == NQ310 ##\n", __func__); |
| 1104 | break; |
| 1105 | case NFCC_NQ_330: |
| 1106 | dev_dbg(&client->dev, |
| 1107 | "%s: ## NFCC == NQ330 ##\n", __func__); |
| 1108 | break; |
| 1109 | case NFCC_PN66T: |
| 1110 | dev_dbg(&client->dev, |
| 1111 | "%s: ## NFCC == PN66T ##\n", __func__); |
| 1112 | break; |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 1113 | case NFCC_SN100_A: |
| 1114 | case NFCC_SN100_B: |
| 1115 | dev_dbg(&client->dev, |
| 1116 | "%s: ## NFCC == SN100x ##\n", __func__); |
| 1117 | break; |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1118 | default: |
| 1119 | dev_err(&client->dev, |
| 1120 | "%s: - NFCC HW not Supported\n", __func__); |
| 1121 | break; |
| 1122 | } |
| 1123 | |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1124 | ret = 0; |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 1125 | nqx_dev->nfc_ven_enabled = true; |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1126 | goto done; |
| 1127 | |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1128 | err_nfcc_hw_check: |
| 1129 | ret = -ENXIO; |
| 1130 | dev_err(&client->dev, |
| 1131 | "%s: - NFCC HW not available\n", __func__); |
| 1132 | |
| 1133 | done: |
| 1134 | kfree(nci_reset_rsp); |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 1135 | kfree(nci_reset_ntf); |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1136 | kfree(nci_reset_cmd); |
| 1137 | kfree(nci_get_version_cmd); |
| 1138 | kfree(nci_get_version_rsp); |
| 1139 | |
| 1140 | return ret; |
| 1141 | } |
| 1142 | |
| 1143 | /* |
| 1144 | * Routine to enable clock. |
| 1145 | * this routine can be extended to select from multiple |
| 1146 | * sources based on clk_src_name. |
| 1147 | */ |
| 1148 | static int nqx_clock_select(struct nqx_dev *nqx_dev) |
| 1149 | { |
| 1150 | int r = 0; |
| 1151 | |
| 1152 | nqx_dev->s_clk = clk_get(&nqx_dev->client->dev, "ref_clk"); |
| 1153 | |
| 1154 | if (nqx_dev->s_clk == NULL) |
| 1155 | goto err_clk; |
| 1156 | |
| 1157 | if (!nqx_dev->clk_run) |
| 1158 | r = clk_prepare_enable(nqx_dev->s_clk); |
| 1159 | |
| 1160 | if (r) |
| 1161 | goto err_clk; |
| 1162 | |
| 1163 | nqx_dev->clk_run = true; |
| 1164 | |
| 1165 | return r; |
| 1166 | |
| 1167 | err_clk: |
| 1168 | r = -1; |
| 1169 | return r; |
| 1170 | } |
| 1171 | |
| 1172 | /* |
| 1173 | * Routine to disable clocks |
| 1174 | */ |
| 1175 | static int nqx_clock_deselect(struct nqx_dev *nqx_dev) |
| 1176 | { |
| 1177 | int r = -1; |
| 1178 | |
| 1179 | if (nqx_dev->s_clk != NULL) { |
| 1180 | if (nqx_dev->clk_run) { |
| 1181 | clk_disable_unprepare(nqx_dev->s_clk); |
| 1182 | nqx_dev->clk_run = false; |
| 1183 | } |
| 1184 | return 0; |
| 1185 | } |
| 1186 | return r; |
| 1187 | } |
| 1188 | |
| 1189 | static int nfc_parse_dt(struct device *dev, struct nqx_platform_data *pdata) |
| 1190 | { |
| 1191 | int r = 0; |
| 1192 | struct device_node *np = dev->of_node; |
| 1193 | |
| 1194 | pdata->en_gpio = of_get_named_gpio(np, "qcom,nq-ven", 0); |
| 1195 | if ((!gpio_is_valid(pdata->en_gpio))) |
| 1196 | return -EINVAL; |
| 1197 | disable_ctrl = pdata->en_gpio; |
| 1198 | |
| 1199 | pdata->irq_gpio = of_get_named_gpio(np, "qcom,nq-irq", 0); |
| 1200 | if ((!gpio_is_valid(pdata->irq_gpio))) |
| 1201 | return -EINVAL; |
| 1202 | |
| 1203 | pdata->firm_gpio = of_get_named_gpio(np, "qcom,nq-firm", 0); |
| 1204 | if (!gpio_is_valid(pdata->firm_gpio)) { |
| 1205 | dev_warn(dev, |
| 1206 | "FIRM GPIO <OPTIONAL> error getting from OF node\n"); |
| 1207 | pdata->firm_gpio = -EINVAL; |
| 1208 | } |
| 1209 | |
| 1210 | pdata->ese_gpio = of_get_named_gpio(np, "qcom,nq-esepwr", 0); |
| 1211 | if (!gpio_is_valid(pdata->ese_gpio)) { |
| 1212 | dev_warn(dev, |
| 1213 | "ese GPIO <OPTIONAL> error getting from OF node\n"); |
| 1214 | pdata->ese_gpio = -EINVAL; |
| 1215 | } |
| 1216 | |
| 1217 | if (of_property_read_string(np, "qcom,clk-src", &pdata->clk_src_name)) |
| 1218 | pdata->clk_pin_voting = false; |
| 1219 | else |
| 1220 | pdata->clk_pin_voting = true; |
| 1221 | |
| 1222 | pdata->clkreq_gpio = of_get_named_gpio(np, "qcom,nq-clkreq", 0); |
| 1223 | |
| 1224 | return r; |
| 1225 | } |
| 1226 | |
| 1227 | static inline int gpio_input_init(const struct device * const dev, |
| 1228 | const int gpio, const char * const gpio_name) |
| 1229 | { |
| 1230 | int r = gpio_request(gpio, gpio_name); |
| 1231 | |
| 1232 | if (r) { |
| 1233 | dev_err(dev, "unable to request gpio [%d]\n", gpio); |
| 1234 | return r; |
| 1235 | } |
| 1236 | |
| 1237 | r = gpio_direction_input(gpio); |
| 1238 | if (r) |
| 1239 | dev_err(dev, "unable to set direction for gpio [%d]\n", gpio); |
| 1240 | |
| 1241 | return r; |
| 1242 | } |
| 1243 | |
| 1244 | static int nqx_probe(struct i2c_client *client, |
| 1245 | const struct i2c_device_id *id) |
| 1246 | { |
| 1247 | int r = 0; |
| 1248 | int irqn = 0; |
| 1249 | struct nqx_platform_data *platform_data; |
| 1250 | struct nqx_dev *nqx_dev; |
| 1251 | |
| 1252 | dev_dbg(&client->dev, "%s: enter\n", __func__); |
| 1253 | if (client->dev.of_node) { |
| 1254 | platform_data = devm_kzalloc(&client->dev, |
| 1255 | sizeof(struct nqx_platform_data), GFP_KERNEL); |
| 1256 | if (!platform_data) { |
| 1257 | r = -ENOMEM; |
| 1258 | goto err_platform_data; |
| 1259 | } |
| 1260 | r = nfc_parse_dt(&client->dev, platform_data); |
| 1261 | if (r) |
| 1262 | goto err_free_data; |
| 1263 | } else |
| 1264 | platform_data = client->dev.platform_data; |
| 1265 | |
| 1266 | dev_dbg(&client->dev, |
| 1267 | "%s, inside nfc-nci flags = %x\n", |
| 1268 | __func__, client->flags); |
| 1269 | |
| 1270 | if (platform_data == NULL) { |
| 1271 | dev_err(&client->dev, "%s: failed\n", __func__); |
| 1272 | r = -ENODEV; |
| 1273 | goto err_platform_data; |
| 1274 | } |
| 1275 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
| 1276 | dev_err(&client->dev, "%s: need I2C_FUNC_I2C\n", __func__); |
| 1277 | r = -ENODEV; |
| 1278 | goto err_free_data; |
| 1279 | } |
| 1280 | nqx_dev = kzalloc(sizeof(*nqx_dev), GFP_KERNEL); |
| 1281 | if (nqx_dev == NULL) { |
| 1282 | r = -ENOMEM; |
| 1283 | goto err_free_data; |
| 1284 | } |
| 1285 | nqx_dev->client = client; |
| 1286 | nqx_dev->kbuflen = MAX_BUFFER_SIZE; |
| 1287 | nqx_dev->kbuf = kzalloc(MAX_BUFFER_SIZE, GFP_KERNEL); |
| 1288 | if (!nqx_dev->kbuf) { |
| 1289 | dev_err(&client->dev, |
| 1290 | "failed to allocate memory for nqx_dev->kbuf\n"); |
| 1291 | r = -ENOMEM; |
| 1292 | goto err_free_dev; |
| 1293 | } |
| 1294 | |
| 1295 | if (gpio_is_valid(platform_data->en_gpio)) { |
| 1296 | r = gpio_request(platform_data->en_gpio, "nfc_reset_gpio"); |
| 1297 | if (r) { |
| 1298 | dev_err(&client->dev, |
| 1299 | "%s: unable to request nfc reset gpio [%d]\n", |
| 1300 | __func__, |
| 1301 | platform_data->en_gpio); |
| 1302 | goto err_mem; |
| 1303 | } |
| 1304 | r = gpio_direction_output(platform_data->en_gpio, 0); |
| 1305 | if (r) { |
| 1306 | dev_err(&client->dev, |
| 1307 | "%s: unable to set direction for nfc reset gpio [%d]\n", |
| 1308 | __func__, |
| 1309 | platform_data->en_gpio); |
| 1310 | goto err_en_gpio; |
| 1311 | } |
| 1312 | } else { |
| 1313 | dev_err(&client->dev, |
| 1314 | "%s: nfc reset gpio not provided\n", __func__); |
| 1315 | goto err_mem; |
| 1316 | } |
| 1317 | |
| 1318 | if (gpio_is_valid(platform_data->irq_gpio)) { |
| 1319 | r = gpio_request(platform_data->irq_gpio, "nfc_irq_gpio"); |
| 1320 | if (r) { |
| 1321 | dev_err(&client->dev, "%s: unable to request nfc irq gpio [%d]\n", |
| 1322 | __func__, platform_data->irq_gpio); |
| 1323 | goto err_en_gpio; |
| 1324 | } |
| 1325 | r = gpio_direction_input(platform_data->irq_gpio); |
| 1326 | if (r) { |
| 1327 | dev_err(&client->dev, |
| 1328 | "%s: unable to set direction for nfc irq gpio [%d]\n", |
| 1329 | __func__, |
| 1330 | platform_data->irq_gpio); |
| 1331 | goto err_irq_gpio; |
| 1332 | } |
| 1333 | irqn = gpio_to_irq(platform_data->irq_gpio); |
| 1334 | if (irqn < 0) { |
| 1335 | r = irqn; |
| 1336 | goto err_irq_gpio; |
| 1337 | } |
| 1338 | client->irq = irqn; |
| 1339 | } else { |
| 1340 | dev_err(&client->dev, "%s: irq gpio not provided\n", __func__); |
| 1341 | goto err_en_gpio; |
| 1342 | } |
| 1343 | if (gpio_is_valid(platform_data->firm_gpio)) { |
| 1344 | r = gpio_request(platform_data->firm_gpio, |
| 1345 | "nfc_firm_gpio"); |
| 1346 | if (r) { |
| 1347 | dev_err(&client->dev, |
| 1348 | "%s: unable to request nfc firmware gpio [%d]\n", |
| 1349 | __func__, platform_data->firm_gpio); |
| 1350 | goto err_irq_gpio; |
| 1351 | } |
| 1352 | r = gpio_direction_output(platform_data->firm_gpio, 0); |
| 1353 | if (r) { |
| 1354 | dev_err(&client->dev, |
| 1355 | "%s: cannot set direction for nfc firmware gpio [%d]\n", |
| 1356 | __func__, platform_data->firm_gpio); |
| 1357 | goto err_firm_gpio; |
| 1358 | } |
| 1359 | } else { |
| 1360 | dev_err(&client->dev, |
| 1361 | "%s: firm gpio not provided\n", __func__); |
| 1362 | goto err_irq_gpio; |
| 1363 | } |
| 1364 | if (gpio_is_valid(platform_data->ese_gpio)) { |
| 1365 | r = gpio_request(platform_data->ese_gpio, |
| 1366 | "nfc-ese_pwr"); |
| 1367 | if (r) { |
| 1368 | nqx_dev->ese_gpio = -EINVAL; |
| 1369 | dev_err(&client->dev, |
| 1370 | "%s: unable to request nfc ese gpio [%d]\n", |
| 1371 | __func__, platform_data->ese_gpio); |
| 1372 | /* ese gpio optional so we should continue */ |
| 1373 | } else { |
| 1374 | nqx_dev->ese_gpio = platform_data->ese_gpio; |
| 1375 | r = gpio_direction_output(platform_data->ese_gpio, 0); |
| 1376 | if (r) { |
| 1377 | /* |
| 1378 | * free ese gpio and set invalid |
| 1379 | * to avoid further use |
| 1380 | */ |
| 1381 | gpio_free(platform_data->ese_gpio); |
| 1382 | nqx_dev->ese_gpio = -EINVAL; |
| 1383 | dev_err(&client->dev, |
| 1384 | "%s: cannot set direction for nfc ese gpio [%d]\n", |
| 1385 | __func__, platform_data->ese_gpio); |
| 1386 | /* ese gpio optional so we should continue */ |
| 1387 | } |
| 1388 | } |
| 1389 | } else { |
| 1390 | nqx_dev->ese_gpio = -EINVAL; |
| 1391 | dev_err(&client->dev, |
| 1392 | "%s: ese gpio not provided\n", __func__); |
| 1393 | /* ese gpio optional so we should continue */ |
| 1394 | } |
| 1395 | if (gpio_is_valid(platform_data->clkreq_gpio)) { |
| 1396 | r = gpio_request(platform_data->clkreq_gpio, |
| 1397 | "nfc_clkreq_gpio"); |
| 1398 | if (r) { |
| 1399 | dev_err(&client->dev, |
| 1400 | "%s: unable to request nfc clkreq gpio [%d]\n", |
| 1401 | __func__, platform_data->clkreq_gpio); |
| 1402 | goto err_ese_gpio; |
| 1403 | } |
| 1404 | r = gpio_direction_input(platform_data->clkreq_gpio); |
| 1405 | if (r) { |
| 1406 | dev_err(&client->dev, |
| 1407 | "%s: cannot set direction for nfc clkreq gpio [%d]\n", |
| 1408 | __func__, platform_data->clkreq_gpio); |
| 1409 | goto err_clkreq_gpio; |
| 1410 | } |
| 1411 | } else { |
| 1412 | dev_err(&client->dev, |
| 1413 | "%s: clkreq gpio not provided\n", __func__); |
| 1414 | goto err_ese_gpio; |
| 1415 | } |
| 1416 | |
| 1417 | nqx_dev->en_gpio = platform_data->en_gpio; |
| 1418 | nqx_dev->irq_gpio = platform_data->irq_gpio; |
| 1419 | nqx_dev->firm_gpio = platform_data->firm_gpio; |
| 1420 | nqx_dev->clkreq_gpio = platform_data->clkreq_gpio; |
| 1421 | nqx_dev->pdata = platform_data; |
| 1422 | |
| 1423 | /* init mutex and queues */ |
| 1424 | init_waitqueue_head(&nqx_dev->read_wq); |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 1425 | init_waitqueue_head(&nqx_dev->cold_reset_read_wq); |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1426 | mutex_init(&nqx_dev->read_mutex); |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 1427 | mutex_init(&nqx_dev->dev_ref_mutex); |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1428 | spin_lock_init(&nqx_dev->irq_enabled_lock); |
| 1429 | |
| 1430 | r = alloc_chrdev_region(&nqx_dev->devno, 0, DEV_COUNT, DEVICE_NAME); |
| 1431 | if (r < 0) { |
| 1432 | dev_err(&client->dev, |
| 1433 | "%s: failed to alloc chrdev region\n", __func__); |
| 1434 | goto err_char_dev_register; |
| 1435 | } |
| 1436 | |
| 1437 | nqx_dev->nqx_class = class_create(THIS_MODULE, CLASS_NAME); |
| 1438 | if (IS_ERR(nqx_dev->nqx_class)) { |
| 1439 | dev_err(&client->dev, |
| 1440 | "%s: failed to register device class\n", __func__); |
| 1441 | goto err_class_create; |
| 1442 | } |
| 1443 | |
| 1444 | cdev_init(&nqx_dev->c_dev, &nfc_dev_fops); |
| 1445 | r = cdev_add(&nqx_dev->c_dev, nqx_dev->devno, DEV_COUNT); |
| 1446 | if (r < 0) { |
| 1447 | dev_err(&client->dev, "%s: failed to add cdev\n", __func__); |
| 1448 | goto err_cdev_add; |
| 1449 | } |
| 1450 | |
| 1451 | nqx_dev->nqx_device = device_create(nqx_dev->nqx_class, NULL, |
| 1452 | nqx_dev->devno, nqx_dev, DEVICE_NAME); |
| 1453 | if (IS_ERR(nqx_dev->nqx_device)) { |
| 1454 | dev_err(&client->dev, |
| 1455 | "%s: failed to create the device\n", __func__); |
| 1456 | goto err_device_create; |
| 1457 | } |
| 1458 | |
| 1459 | /* NFC_INT IRQ */ |
| 1460 | nqx_dev->irq_enabled = true; |
| 1461 | r = request_irq(client->irq, nqx_dev_irq_handler, |
| 1462 | IRQF_TRIGGER_HIGH, client->name, nqx_dev); |
| 1463 | if (r) { |
| 1464 | dev_err(&client->dev, "%s: request_irq failed\n", __func__); |
| 1465 | goto err_request_irq_failed; |
| 1466 | } |
| 1467 | nqx_disable_irq(nqx_dev); |
| 1468 | |
| 1469 | /* |
| 1470 | * To be efficient we need to test whether nfcc hardware is physically |
| 1471 | * present before attempting further hardware initialisation. |
| 1472 | * |
| 1473 | */ |
| 1474 | r = nfcc_hw_check(client, nqx_dev); |
| 1475 | if (r) { |
| 1476 | /* make sure NFCC is not enabled */ |
| 1477 | gpio_set_value(platform_data->en_gpio, 0); |
| 1478 | /* We don't think there is hardware switch NFC OFF */ |
| 1479 | goto err_request_hw_check_failed; |
| 1480 | } |
| 1481 | |
| 1482 | /* Register reboot notifier here */ |
| 1483 | r = register_reboot_notifier(&nfcc_notifier); |
| 1484 | if (r) { |
| 1485 | dev_err(&client->dev, |
| 1486 | "%s: cannot register reboot notifier(err = %d)\n", |
| 1487 | __func__, r); |
| 1488 | /* |
| 1489 | * nfcc_hw_check function not doing memory |
| 1490 | * allocation so using same goto target here |
| 1491 | */ |
| 1492 | goto err_request_hw_check_failed; |
| 1493 | } |
| 1494 | |
| 1495 | #ifdef NFC_KERNEL_BU |
| 1496 | r = nqx_clock_select(nqx_dev); |
| 1497 | if (r < 0) { |
| 1498 | dev_err(&client->dev, |
| 1499 | "%s: nqx_clock_select failed\n", __func__); |
| 1500 | goto err_clock_en_failed; |
| 1501 | } |
| 1502 | gpio_set_value(platform_data->en_gpio, 1); |
| 1503 | #endif |
| 1504 | device_init_wakeup(&client->dev, true); |
| 1505 | device_set_wakeup_capable(&client->dev, true); |
| 1506 | i2c_set_clientdata(client, nqx_dev); |
| 1507 | nqx_dev->irq_wake_up = false; |
Bhuvan Varshney | dea45e3 | 2019-09-03 11:15:22 +0530 | [diff] [blame] | 1508 | nqx_dev->cold_reset_rsp_pending = false; |
| 1509 | nqx_dev->nfc_enabled = false; |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1510 | |
| 1511 | dev_err(&client->dev, |
| 1512 | "%s: probing NFCC NQxxx exited successfully\n", |
| 1513 | __func__); |
| 1514 | return 0; |
| 1515 | |
| 1516 | #ifdef NFC_KERNEL_BU |
| 1517 | err_clock_en_failed: |
| 1518 | unregister_reboot_notifier(&nfcc_notifier); |
| 1519 | #endif |
| 1520 | err_request_hw_check_failed: |
| 1521 | free_irq(client->irq, nqx_dev); |
| 1522 | err_request_irq_failed: |
| 1523 | device_destroy(nqx_dev->nqx_class, nqx_dev->devno); |
| 1524 | err_device_create: |
| 1525 | cdev_del(&nqx_dev->c_dev); |
| 1526 | err_cdev_add: |
| 1527 | class_destroy(nqx_dev->nqx_class); |
| 1528 | err_class_create: |
| 1529 | unregister_chrdev_region(nqx_dev->devno, DEV_COUNT); |
| 1530 | err_char_dev_register: |
| 1531 | mutex_destroy(&nqx_dev->read_mutex); |
| 1532 | err_clkreq_gpio: |
| 1533 | gpio_free(platform_data->clkreq_gpio); |
| 1534 | err_ese_gpio: |
| 1535 | /* optional gpio, not sure was configured in probe */ |
Bhuvan Varshney | 0bf56a4 | 2019-03-20 13:26:27 +0530 | [diff] [blame] | 1536 | if (gpio_is_valid(platform_data->ese_gpio)) |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1537 | gpio_free(platform_data->ese_gpio); |
| 1538 | err_firm_gpio: |
| 1539 | gpio_free(platform_data->firm_gpio); |
| 1540 | err_irq_gpio: |
| 1541 | gpio_free(platform_data->irq_gpio); |
| 1542 | err_en_gpio: |
| 1543 | gpio_free(platform_data->en_gpio); |
| 1544 | err_mem: |
| 1545 | kfree(nqx_dev->kbuf); |
| 1546 | err_free_dev: |
| 1547 | kfree(nqx_dev); |
| 1548 | err_free_data: |
| 1549 | if (client->dev.of_node) |
| 1550 | devm_kfree(&client->dev, platform_data); |
| 1551 | err_platform_data: |
| 1552 | dev_err(&client->dev, |
| 1553 | "%s: probing nqxx failed, check hardware\n", |
| 1554 | __func__); |
| 1555 | return r; |
| 1556 | } |
| 1557 | |
| 1558 | static int nqx_remove(struct i2c_client *client) |
| 1559 | { |
| 1560 | int ret = 0; |
| 1561 | struct nqx_dev *nqx_dev; |
| 1562 | |
| 1563 | nqx_dev = i2c_get_clientdata(client); |
| 1564 | if (!nqx_dev) { |
| 1565 | dev_err(&client->dev, |
| 1566 | "%s: device doesn't exist anymore\n", __func__); |
| 1567 | ret = -ENODEV; |
| 1568 | goto err; |
| 1569 | } |
| 1570 | |
| 1571 | unregister_reboot_notifier(&nfcc_notifier); |
| 1572 | free_irq(client->irq, nqx_dev); |
| 1573 | cdev_del(&nqx_dev->c_dev); |
| 1574 | device_destroy(nqx_dev->nqx_class, nqx_dev->devno); |
| 1575 | class_destroy(nqx_dev->nqx_class); |
| 1576 | unregister_chrdev_region(nqx_dev->devno, DEV_COUNT); |
| 1577 | mutex_destroy(&nqx_dev->read_mutex); |
Bhuvan Varshney | 31df1f5 | 2019-05-20 15:57:08 +0530 | [diff] [blame] | 1578 | mutex_destroy(&nqx_dev->dev_ref_mutex); |
Tapas Dey | 367bf99 | 2019-01-17 16:54:23 +0530 | [diff] [blame] | 1579 | gpio_free(nqx_dev->clkreq_gpio); |
| 1580 | /* optional gpio, not sure was configured in probe */ |
| 1581 | if (nqx_dev->ese_gpio > 0) |
| 1582 | gpio_free(nqx_dev->ese_gpio); |
| 1583 | gpio_free(nqx_dev->firm_gpio); |
| 1584 | gpio_free(nqx_dev->irq_gpio); |
| 1585 | gpio_free(nqx_dev->en_gpio); |
| 1586 | kfree(nqx_dev->kbuf); |
| 1587 | if (client->dev.of_node) |
| 1588 | devm_kfree(&client->dev, nqx_dev->pdata); |
| 1589 | |
| 1590 | kfree(nqx_dev); |
| 1591 | err: |
| 1592 | return ret; |
| 1593 | } |
| 1594 | |
| 1595 | static int nqx_suspend(struct device *device) |
| 1596 | { |
| 1597 | struct i2c_client *client = to_i2c_client(device); |
| 1598 | struct nqx_dev *nqx_dev = i2c_get_clientdata(client); |
| 1599 | |
| 1600 | if (device_may_wakeup(&client->dev) && nqx_dev->irq_enabled) { |
| 1601 | if (!enable_irq_wake(client->irq)) |
| 1602 | nqx_dev->irq_wake_up = true; |
| 1603 | } |
| 1604 | return 0; |
| 1605 | } |
| 1606 | |
| 1607 | static int nqx_resume(struct device *device) |
| 1608 | { |
| 1609 | struct i2c_client *client = to_i2c_client(device); |
| 1610 | struct nqx_dev *nqx_dev = i2c_get_clientdata(client); |
| 1611 | |
| 1612 | if (device_may_wakeup(&client->dev) && nqx_dev->irq_wake_up) { |
| 1613 | if (!disable_irq_wake(client->irq)) |
| 1614 | nqx_dev->irq_wake_up = false; |
| 1615 | } |
| 1616 | return 0; |
| 1617 | } |
| 1618 | |
| 1619 | static const struct i2c_device_id nqx_id[] = { |
| 1620 | {"nqx-i2c", 0}, |
| 1621 | {} |
| 1622 | }; |
| 1623 | |
| 1624 | static const struct dev_pm_ops nfc_pm_ops = { |
| 1625 | SET_SYSTEM_SLEEP_PM_OPS(nqx_suspend, nqx_resume) |
| 1626 | }; |
| 1627 | |
| 1628 | static struct i2c_driver nqx = { |
| 1629 | .id_table = nqx_id, |
| 1630 | .probe = nqx_probe, |
| 1631 | .remove = nqx_remove, |
| 1632 | .driver = { |
| 1633 | .name = "nq-nci", |
| 1634 | .of_match_table = msm_match_table, |
| 1635 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
| 1636 | .pm = &nfc_pm_ops, |
| 1637 | }, |
| 1638 | }; |
| 1639 | |
| 1640 | static int nfcc_reboot(struct notifier_block *notifier, unsigned long val, |
| 1641 | void *v) |
| 1642 | { |
| 1643 | gpio_set_value(disable_ctrl, 1); |
| 1644 | return NOTIFY_OK; |
| 1645 | } |
| 1646 | |
| 1647 | /* |
| 1648 | * module load/unload record keeping |
| 1649 | */ |
| 1650 | static int __init nqx_dev_init(void) |
| 1651 | { |
| 1652 | return i2c_add_driver(&nqx); |
| 1653 | } |
| 1654 | module_init(nqx_dev_init); |
| 1655 | |
| 1656 | static void __exit nqx_dev_exit(void) |
| 1657 | { |
| 1658 | unregister_reboot_notifier(&nfcc_notifier); |
| 1659 | i2c_del_driver(&nqx); |
| 1660 | } |
| 1661 | module_exit(nqx_dev_exit); |
| 1662 | |
| 1663 | MODULE_DESCRIPTION("NFC nqx"); |
| 1664 | MODULE_LICENSE("GPL v2"); |