drivers/mfd/wm8350-core.c

   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(&reg_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(&reg_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(&reg_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(&reg_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);