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