1 /* 2 * wm8350-core.c -- Device access for Wolfson WM8350 3 * 4 * Copyright 2007, 2008 Wolfson Microelectronics PLC. 5 * 6 * Author: Liam Girdwood, Mark Brown 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 * 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/slab.h> 18 #include <linux/bug.h> 19 #include <linux/device.h> 20 #include <linux/delay.h> 21 #include <linux/interrupt.h> 22 #include <linux/regmap.h> 23 #include <linux/workqueue.h> 24 25 #include <linux/mfd/wm8350/core.h> 26 #include <linux/mfd/wm8350/audio.h> 27 #include <linux/mfd/wm8350/comparator.h> 28 #include <linux/mfd/wm8350/gpio.h> 29 #include <linux/mfd/wm8350/pmic.h> 30 #include <linux/mfd/wm8350/rtc.h> 31 #include <linux/mfd/wm8350/supply.h> 32 #include <linux/mfd/wm8350/wdt.h> 33 34 #define WM8350_CLOCK_CONTROL_1 0x28 35 #define WM8350_AIF_TEST 0x74 36 37 /* debug */ 38 #define WM8350_BUS_DEBUG 0 39 #if WM8350_BUS_DEBUG 40 #define dump(regs, src) do { \ 41 int i_; \ 42 u16 *src_ = src; \ 43 printk(KERN_DEBUG); \ 44 for (i_ = 0; i_ < regs; i_++) \ 45 printk(" 0x%4.4x", *src_++); \ 46 printk("\n"); \ 47 } while (0); 48 #else 49 #define dump(bytes, src) 50 #endif 51 52 #define WM8350_LOCK_DEBUG 0 53 #if WM8350_LOCK_DEBUG 54 #define ldbg(format, arg...) printk(format, ## arg) 55 #else 56 #define ldbg(format, arg...) 57 #endif 58 59 /* 60 * WM8350 Device IO 61 */ 62 static DEFINE_MUTEX(reg_lock_mutex); 63 64 /* 65 * Safe read, modify, write methods 66 */ 67 int wm8350_clear_bits(struct wm8350 *wm8350, u16 reg, u16 mask) 68 { 69 return regmap_update_bits(wm8350->regmap, reg, mask, 0); 70 } 71 EXPORT_SYMBOL_GPL(wm8350_clear_bits); 72 73 int wm8350_set_bits(struct wm8350 *wm8350, u16 reg, u16 mask) 74 { 75 return regmap_update_bits(wm8350->regmap, reg, mask, mask); 76 } 77 EXPORT_SYMBOL_GPL(wm8350_set_bits); 78 79 u16 wm8350_reg_read(struct wm8350 *wm8350, int reg) 80 { 81 unsigned int data; 82 int err; 83 84 err = regmap_read(wm8350->regmap, reg, &data); 85 if (err) 86 dev_err(wm8350->dev, "read from reg R%d failed\n", reg); 87 88 return data; 89 } 90 EXPORT_SYMBOL_GPL(wm8350_reg_read); 91 92 int wm8350_reg_write(struct wm8350 *wm8350, int reg, u16 val) 93 { 94 int ret; 95 96 ret = regmap_write(wm8350->regmap, reg, val); 97 98 if (ret) 99 dev_err(wm8350->dev, "write to reg R%d failed\n", reg); 100 return ret; 101 } 102 EXPORT_SYMBOL_GPL(wm8350_reg_write); 103 104 int wm8350_block_read(struct wm8350 *wm8350, int start_reg, int regs, 105 u16 *dest) 106 { 107 int err = 0; 108 109 err = regmap_bulk_read(wm8350->regmap, start_reg, dest, regs); 110 if (err) 111 dev_err(wm8350->dev, "block read starting from R%d failed\n", 112 start_reg); 113 114 return err; 115 } 116 EXPORT_SYMBOL_GPL(wm8350_block_read); 117 118 int wm8350_block_write(struct wm8350 *wm8350, int start_reg, int regs, 119 u16 *src) 120 { 121 int ret = 0; 122 123 ret = regmap_bulk_write(wm8350->regmap, start_reg, src, regs); 124 if (ret) 125 dev_err(wm8350->dev, "block write starting at R%d failed\n", 126 start_reg); 127 128 return ret; 129 } 130 EXPORT_SYMBOL_GPL(wm8350_block_write); 131 132 /** 133 * wm8350_reg_lock() 134 * 135 * The WM8350 has a hardware lock which can be used to prevent writes to 136 * some registers (generally those which can cause particularly serious 137 * problems if misused). This function enables that lock. 138 */ 139 int wm8350_reg_lock(struct wm8350 *wm8350) 140 { 141 int ret; 142 143 mutex_lock(®_lock_mutex); 144 145 ldbg(__func__); 146 147 ret = wm8350_reg_write(wm8350, WM8350_SECURITY, WM8350_LOCK_KEY); 148 if (ret) 149 dev_err(wm8350->dev, "lock failed\n"); 150 151 wm8350->unlocked = false; 152 153 mutex_unlock(®_lock_mutex); 154 155 return ret; 156 } 157 EXPORT_SYMBOL_GPL(wm8350_reg_lock); 158 159 /** 160 * wm8350_reg_unlock() 161 * 162 * The WM8350 has a hardware lock which can be used to prevent writes to 163 * some registers (generally those which can cause particularly serious 164 * problems if misused). This function disables that lock so updates 165 * can be performed. For maximum safety this should be done only when 166 * required. 167 */ 168 int wm8350_reg_unlock(struct wm8350 *wm8350) 169 { 170 int ret; 171 172 mutex_lock(®_lock_mutex); 173 174 ldbg(__func__); 175 176 ret = wm8350_reg_write(wm8350, WM8350_SECURITY, WM8350_UNLOCK_KEY); 177 if (ret) 178 dev_err(wm8350->dev, "unlock failed\n"); 179 180 wm8350->unlocked = true; 181 182 mutex_unlock(®_lock_mutex); 183 184 return ret; 185 } 186 EXPORT_SYMBOL_GPL(wm8350_reg_unlock); 187 188 int wm8350_read_auxadc(struct wm8350 *wm8350, int channel, int scale, int vref) 189 { 190 u16 reg, result = 0; 191 192 if (channel < WM8350_AUXADC_AUX1 || channel > WM8350_AUXADC_TEMP) 193 return -EINVAL; 194 if (channel >= WM8350_AUXADC_USB && channel <= WM8350_AUXADC_TEMP 195 && (scale != 0 || vref != 0)) 196 return -EINVAL; 197 198 mutex_lock(&wm8350->auxadc_mutex); 199 200 /* Turn on the ADC */ 201 reg = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5); 202 wm8350_reg_write(wm8350, WM8350_POWER_MGMT_5, reg | WM8350_AUXADC_ENA); 203 204 if (scale || vref) { 205 reg = scale << 13; 206 reg |= vref << 12; 207 wm8350_reg_write(wm8350, WM8350_AUX1_READBACK + channel, reg); 208 } 209 210 reg = wm8350_reg_read(wm8350, WM8350_DIGITISER_CONTROL_1); 211 reg |= 1 << channel | WM8350_AUXADC_POLL; 212 wm8350_reg_write(wm8350, WM8350_DIGITISER_CONTROL_1, reg); 213 214 /* If a late IRQ left the completion signalled then consume 215 * the completion. */ 216 try_wait_for_completion(&wm8350->auxadc_done); 217 218 /* We ignore the result of the completion and just check for a 219 * conversion result, allowing us to soldier on if the IRQ 220 * infrastructure is not set up for the chip. */ 221 wait_for_completion_timeout(&wm8350->auxadc_done, msecs_to_jiffies(5)); 222 223 reg = wm8350_reg_read(wm8350, WM8350_DIGITISER_CONTROL_1); 224 if (reg & WM8350_AUXADC_POLL) 225 dev_err(wm8350->dev, "adc chn %d read timeout\n", channel); 226 else 227 result = wm8350_reg_read(wm8350, 228 WM8350_AUX1_READBACK + channel); 229 230 /* Turn off the ADC */ 231 reg = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5); 232 wm8350_reg_write(wm8350, WM8350_POWER_MGMT_5, 233 reg & ~WM8350_AUXADC_ENA); 234 235 mutex_unlock(&wm8350->auxadc_mutex); 236 237 return result & WM8350_AUXADC_DATA1_MASK; 238 } 239 EXPORT_SYMBOL_GPL(wm8350_read_auxadc); 240 241 static irqreturn_t wm8350_auxadc_irq(int irq, void *irq_data) 242 { 243 struct wm8350 *wm8350 = irq_data; 244 245 complete(&wm8350->auxadc_done); 246 247 return IRQ_HANDLED; 248 } 249 250 /* 251 * Register a client device. This is non-fatal since there is no need to 252 * fail the entire device init due to a single platform device failing. 253 */ 254 static void wm8350_client_dev_register(struct wm8350 *wm8350, 255 const char *name, 256 struct platform_device **pdev) 257 { 258 int ret; 259 260 *pdev = platform_device_alloc(name, -1); 261 if (*pdev == NULL) { 262 dev_err(wm8350->dev, "Failed to allocate %s\n", name); 263 return; 264 } 265 266 (*pdev)->dev.parent = wm8350->dev; 267 platform_set_drvdata(*pdev, wm8350); 268 ret = platform_device_add(*pdev); 269 if (ret != 0) { 270 dev_err(wm8350->dev, "Failed to register %s: %d\n", name, ret); 271 platform_device_put(*pdev); 272 *pdev = NULL; 273 } 274 } 275 276 int wm8350_device_init(struct wm8350 *wm8350, int irq, 277 struct wm8350_platform_data *pdata) 278 { 279 int ret; 280 unsigned int id1, id2, mask_rev; 281 unsigned int cust_id, mode, chip_rev; 282 283 dev_set_drvdata(wm8350->dev, wm8350); 284 285 /* get WM8350 revision and config mode */ 286 ret = regmap_read(wm8350->regmap, WM8350_RESET_ID, &id1); 287 if (ret != 0) { 288 dev_err(wm8350->dev, "Failed to read ID: %d\n", ret); 289 goto err; 290 } 291 292 ret = regmap_read(wm8350->regmap, WM8350_ID, &id2); 293 if (ret != 0) { 294 dev_err(wm8350->dev, "Failed to read ID: %d\n", ret); 295 goto err; 296 } 297 298 ret = regmap_read(wm8350->regmap, WM8350_REVISION, &mask_rev); 299 if (ret != 0) { 300 dev_err(wm8350->dev, "Failed to read revision: %d\n", ret); 301 goto err; 302 } 303 304 if (id1 != 0x6143) { 305 dev_err(wm8350->dev, 306 "Device with ID %x is not a WM8350\n", id1); 307 ret = -ENODEV; 308 goto err; 309 } 310 311 mode = (id2 & WM8350_CONF_STS_MASK) >> 10; 312 cust_id = id2 & WM8350_CUST_ID_MASK; 313 chip_rev = (id2 & WM8350_CHIP_REV_MASK) >> 12; 314 dev_info(wm8350->dev, 315 "CONF_STS %d, CUST_ID %d, MASK_REV %d, CHIP_REV %d\n", 316 mode, cust_id, mask_rev, chip_rev); 317 318 if (cust_id != 0) { 319 dev_err(wm8350->dev, "Unsupported CUST_ID\n"); 320 ret = -ENODEV; 321 goto err; 322 } 323 324 switch (mask_rev) { 325 case 0: 326 wm8350->pmic.max_dcdc = WM8350_DCDC_6; 327 wm8350->pmic.max_isink = WM8350_ISINK_B; 328 329 switch (chip_rev) { 330 case WM8350_REV_E: 331 dev_info(wm8350->dev, "WM8350 Rev E\n"); 332 break; 333 case WM8350_REV_F: 334 dev_info(wm8350->dev, "WM8350 Rev F\n"); 335 break; 336 case WM8350_REV_G: 337 dev_info(wm8350->dev, "WM8350 Rev G\n"); 338 wm8350->power.rev_g_coeff = 1; 339 break; 340 case WM8350_REV_H: 341 dev_info(wm8350->dev, "WM8350 Rev H\n"); 342 wm8350->power.rev_g_coeff = 1; 343 break; 344 default: 345 /* For safety we refuse to run on unknown hardware */ 346 dev_err(wm8350->dev, "Unknown WM8350 CHIP_REV\n"); 347 ret = -ENODEV; 348 goto err; 349 } 350 break; 351 352 case 1: 353 wm8350->pmic.max_dcdc = WM8350_DCDC_4; 354 wm8350->pmic.max_isink = WM8350_ISINK_A; 355 356 switch (chip_rev) { 357 case 0: 358 dev_info(wm8350->dev, "WM8351 Rev A\n"); 359 wm8350->power.rev_g_coeff = 1; 360 break; 361 362 case 1: 363 dev_info(wm8350->dev, "WM8351 Rev B\n"); 364 wm8350->power.rev_g_coeff = 1; 365 break; 366 367 default: 368 dev_err(wm8350->dev, "Unknown WM8351 CHIP_REV\n"); 369 ret = -ENODEV; 370 goto err; 371 } 372 break; 373 374 case 2: 375 wm8350->pmic.max_dcdc = WM8350_DCDC_6; 376 wm8350->pmic.max_isink = WM8350_ISINK_B; 377 378 switch (chip_rev) { 379 case 0: 380 dev_info(wm8350->dev, "WM8352 Rev A\n"); 381 wm8350->power.rev_g_coeff = 1; 382 break; 383 384 default: 385 dev_err(wm8350->dev, "Unknown WM8352 CHIP_REV\n"); 386 ret = -ENODEV; 387 goto err; 388 } 389 break; 390 391 default: 392 dev_err(wm8350->dev, "Unknown MASK_REV\n"); 393 ret = -ENODEV; 394 goto err; 395 } 396 397 mutex_init(&wm8350->auxadc_mutex); 398 init_completion(&wm8350->auxadc_done); 399 400 ret = wm8350_irq_init(wm8350, irq, pdata); 401 if (ret < 0) 402 goto err; 403 404 if (wm8350->irq_base) { 405 ret = request_threaded_irq(wm8350->irq_base + 406 WM8350_IRQ_AUXADC_DATARDY, 407 NULL, wm8350_auxadc_irq, 0, 408 "auxadc", wm8350); 409 if (ret < 0) 410 dev_warn(wm8350->dev, 411 "Failed to request AUXADC IRQ: %d\n", ret); 412 } 413 414 if (pdata && pdata->init) { 415 ret = pdata->init(wm8350); 416 if (ret != 0) { 417 dev_err(wm8350->dev, "Platform init() failed: %d\n", 418 ret); 419 goto err_irq; 420 } 421 } 422 423 wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0x0); 424 425 wm8350_client_dev_register(wm8350, "wm8350-codec", 426 &(wm8350->codec.pdev)); 427 wm8350_client_dev_register(wm8350, "wm8350-gpio", 428 &(wm8350->gpio.pdev)); 429 wm8350_client_dev_register(wm8350, "wm8350-hwmon", 430 &(wm8350->hwmon.pdev)); 431 wm8350_client_dev_register(wm8350, "wm8350-power", 432 &(wm8350->power.pdev)); 433 wm8350_client_dev_register(wm8350, "wm8350-rtc", &(wm8350->rtc.pdev)); 434 wm8350_client_dev_register(wm8350, "wm8350-wdt", &(wm8350->wdt.pdev)); 435 436 return 0; 437 438 err_irq: 439 wm8350_irq_exit(wm8350); 440 err: 441 return ret; 442 } 443 EXPORT_SYMBOL_GPL(wm8350_device_init); 444 445 void wm8350_device_exit(struct wm8350 *wm8350) 446 { 447 int i; 448 449 for (i = 0; i < ARRAY_SIZE(wm8350->pmic.led); i++) 450 platform_device_unregister(wm8350->pmic.led[i].pdev); 451 452 for (i = 0; i < ARRAY_SIZE(wm8350->pmic.pdev); i++) 453 platform_device_unregister(wm8350->pmic.pdev[i]); 454 455 platform_device_unregister(wm8350->wdt.pdev); 456 platform_device_unregister(wm8350->rtc.pdev); 457 platform_device_unregister(wm8350->power.pdev); 458 platform_device_unregister(wm8350->hwmon.pdev); 459 platform_device_unregister(wm8350->gpio.pdev); 460 platform_device_unregister(wm8350->codec.pdev); 461 462 if (wm8350->irq_base) 463 free_irq(wm8350->irq_base + WM8350_IRQ_AUXADC_DATARDY, wm8350); 464 465 wm8350_irq_exit(wm8350); 466 } 467 EXPORT_SYMBOL_GPL(wm8350_device_exit); 468 469 MODULE_DESCRIPTION("WM8350 AudioPlus PMIC core driver"); 470 MODULE_LICENSE("GPL"); 471