drivers/mfd/wm8350-core.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * wm8350-core.c  --  Device access for Wolfson WM8350
   4  *
   5  * Copyright 2007, 2008 Wolfson Microelectronics PLC.
   6  *
   7  * Author: Liam Girdwood, Mark Brown
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/export.h>
  13 #include <linux/slab.h>
  14 #include <linux/bug.h>
  15 #include <linux/device.h>
  16 #include <linux/delay.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/regmap.h>
  19 #include <linux/workqueue.h>
  20
  21 #include <linux/mfd/wm8350/core.h>
  22 #include <linux/mfd/wm8350/audio.h>
  23 #include <linux/mfd/wm8350/comparator.h>
  24 #include <linux/mfd/wm8350/gpio.h>
  25 #include <linux/mfd/wm8350/pmic.h>
  26 #include <linux/mfd/wm8350/rtc.h>
  27 #include <linux/mfd/wm8350/supply.h>
  28 #include <linux/mfd/wm8350/wdt.h>
  29
  30 #define WM8350_CLOCK_CONTROL_1          0x28
  31 #define WM8350_AIF_TEST                 0x74
  32
  33 /* debug */
  34 #define WM8350_BUS_DEBUG 0
  35 #if WM8350_BUS_DEBUG
  36 #define dump(regs, src) do { \
  37         int i_; \
  38         u16 *src_ = src; \
  39         printk(KERN_DEBUG); \
  40         for (i_ = 0; i_ < regs; i_++) \
  41                 printk(" 0x%4.4x", *src_++); \
  42         printk("\n"); \
  43 } while (0);
  44 #else
  45 #define dump(bytes, src)
  46 #endif
  47
  48 #define WM8350_LOCK_DEBUG 0
  49 #if WM8350_LOCK_DEBUG
  50 #define ldbg(format, arg...) printk(format, ## arg)
  51 #else
  52 #define ldbg(format, arg...)
  53 #endif
  54
  55 /*
  56  * WM8350 Device IO
  57  */
  58 static DEFINE_MUTEX(reg_lock_mutex);
  59
  60 /*
  61  * Safe read, modify, write methods
  62  */
  63 int wm8350_clear_bits(struct wm8350 *wm8350, u16 reg, u16 mask)
  64 {
  65         return regmap_update_bits(wm8350->regmap, reg, mask, 0);
  66 }
  67 EXPORT_SYMBOL_GPL(wm8350_clear_bits);
  68
  69 int wm8350_set_bits(struct wm8350 *wm8350, u16 reg, u16 mask)
  70 {
  71         return regmap_update_bits(wm8350->regmap, reg, mask, mask);
  72 }
  73 EXPORT_SYMBOL_GPL(wm8350_set_bits);
  74
  75 u16 wm8350_reg_read(struct wm8350 *wm8350, int reg)
  76 {
  77         unsigned int data;
  78         int err;
  79
  80         err = regmap_read(wm8350->regmap, reg, &data);
  81         if (err)
  82                 dev_err(wm8350->dev, "read from reg R%d failed\n", reg);
  83
  84         return data;
  85 }
  86 EXPORT_SYMBOL_GPL(wm8350_reg_read);
  87
  88 int wm8350_reg_write(struct wm8350 *wm8350, int reg, u16 val)
  89 {
  90         int ret;
  91
  92         ret = regmap_write(wm8350->regmap, reg, val);
  93
  94         if (ret)
  95                 dev_err(wm8350->dev, "write to reg R%d failed\n", reg);
  96         return ret;
  97 }
  98 EXPORT_SYMBOL_GPL(wm8350_reg_write);
  99
 100 int wm8350_block_read(struct wm8350 *wm8350, int start_reg, int regs,
 101                       u16 *dest)
 102 {
 103         int err = 0;
 104
 105         err = regmap_bulk_read(wm8350->regmap, start_reg, dest, regs);
 106         if (err)
 107                 dev_err(wm8350->dev, "block read starting from R%d failed\n",
 108                         start_reg);
 109
 110         return err;
 111 }
 112 EXPORT_SYMBOL_GPL(wm8350_block_read);
 113
 114 int wm8350_block_write(struct wm8350 *wm8350, int start_reg, int regs,
 115                        u16 *src)
 116 {
 117         int ret = 0;
 118
 119         ret = regmap_bulk_write(wm8350->regmap, start_reg, src, regs);
 120         if (ret)
 121                 dev_err(wm8350->dev, "block write starting at R%d failed\n",
 122                         start_reg);
 123
 124         return ret;
 125 }
 126 EXPORT_SYMBOL_GPL(wm8350_block_write);
 127
 128 /**
 129  * wm8350_reg_lock()
 130  *
 131  * The WM8350 has a hardware lock which can be used to prevent writes to
 132  * some registers (generally those which can cause particularly serious
 133  * problems if misused).  This function enables that lock.
 134  */
 135 int wm8350_reg_lock(struct wm8350 *wm8350)
 136 {
 137         int ret;
 138
 139         mutex_lock(&reg_lock_mutex);
 140
 141         ldbg(__func__);
 142
 143         ret = wm8350_reg_write(wm8350, WM8350_SECURITY, WM8350_LOCK_KEY);
 144         if (ret)
 145                 dev_err(wm8350->dev, "lock failed\n");
 146
 147         wm8350->unlocked = false;
 148
 149         mutex_unlock(&reg_lock_mutex);
 150
 151         return ret;
 152 }
 153 EXPORT_SYMBOL_GPL(wm8350_reg_lock);
 154
 155 /**
 156  * wm8350_reg_unlock()
 157  *
 158  * The WM8350 has a hardware lock which can be used to prevent writes to
 159  * some registers (generally those which can cause particularly serious
 160  * problems if misused).  This function disables that lock so updates
 161  * can be performed.  For maximum safety this should be done only when
 162  * required.
 163  */
 164 int wm8350_reg_unlock(struct wm8350 *wm8350)
 165 {
 166         int ret;
 167
 168         mutex_lock(&reg_lock_mutex);
 169
 170         ldbg(__func__);
 171
 172         ret = wm8350_reg_write(wm8350, WM8350_SECURITY, WM8350_UNLOCK_KEY);
 173         if (ret)
 174                 dev_err(wm8350->dev, "unlock failed\n");
 175
 176         wm8350->unlocked = true;
 177
 178         mutex_unlock(&reg_lock_mutex);
 179
 180         return ret;
 181 }
 182 EXPORT_SYMBOL_GPL(wm8350_reg_unlock);
 183
 184 int wm8350_read_auxadc(struct wm8350 *wm8350, int channel, int scale, int vref)
 185 {
 186         u16 reg, result = 0;
 187
 188         if (channel < WM8350_AUXADC_AUX1 || channel > WM8350_AUXADC_TEMP)
 189                 return -EINVAL;
 190         if (channel >= WM8350_AUXADC_USB && channel <= WM8350_AUXADC_TEMP
 191             && (scale != 0 || vref != 0))
 192                 return -EINVAL;
 193
 194         mutex_lock(&wm8350->auxadc_mutex);
 195
 196         /* Turn on the ADC */
 197         reg = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5);
 198         wm8350_reg_write(wm8350, WM8350_POWER_MGMT_5, reg | WM8350_AUXADC_ENA);
 199
 200         if (scale || vref) {
 201                 reg = scale << 13;
 202                 reg |= vref << 12;
 203                 wm8350_reg_write(wm8350, WM8350_AUX1_READBACK + channel, reg);
 204         }
 205
 206         reg = wm8350_reg_read(wm8350, WM8350_DIGITISER_CONTROL_1);
 207         reg |= 1 << channel | WM8350_AUXADC_POLL;
 208         wm8350_reg_write(wm8350, WM8350_DIGITISER_CONTROL_1, reg);
 209
 210         /* If a late IRQ left the completion signalled then consume
 211          * the completion. */
 212         try_wait_for_completion(&wm8350->auxadc_done);
 213
 214         /* We ignore the result of the completion and just check for a
 215          * conversion result, allowing us to soldier on if the IRQ
 216          * infrastructure is not set up for the chip. */
 217         wait_for_completion_timeout(&wm8350->auxadc_done, msecs_to_jiffies(5));
 218
 219         reg = wm8350_reg_read(wm8350, WM8350_DIGITISER_CONTROL_1);
 220         if (reg & WM8350_AUXADC_POLL)
 221                 dev_err(wm8350->dev, "adc chn %d read timeout\n", channel);
 222         else
 223                 result = wm8350_reg_read(wm8350,
 224                                          WM8350_AUX1_READBACK + channel);
 225
 226         /* Turn off the ADC */
 227         reg = wm8350_reg_read(wm8350, WM8350_POWER_MGMT_5);
 228         wm8350_reg_write(wm8350, WM8350_POWER_MGMT_5,
 229                          reg & ~WM8350_AUXADC_ENA);
 230
 231         mutex_unlock(&wm8350->auxadc_mutex);
 232
 233         return result & WM8350_AUXADC_DATA1_MASK;
 234 }
 235 EXPORT_SYMBOL_GPL(wm8350_read_auxadc);
 236
 237 static irqreturn_t wm8350_auxadc_irq(int irq, void *irq_data)
 238 {
 239         struct wm8350 *wm8350 = irq_data;
 240
 241         complete(&wm8350->auxadc_done);
 242
 243         return IRQ_HANDLED;
 244 }
 245
 246 /*
 247  * Register a client device.  This is non-fatal since there is no need to
 248  * fail the entire device init due to a single platform device failing.
 249  */
 250 static void wm8350_client_dev_register(struct wm8350 *wm8350,
 251                                        const char *name,
 252                                        struct platform_device **pdev)
 253 {
 254         int ret;
 255
 256         *pdev = platform_device_alloc(name, -1);
 257         if (*pdev == NULL) {
 258                 dev_err(wm8350->dev, "Failed to allocate %s\n", name);
 259                 return;
 260         }
 261
 262         (*pdev)->dev.parent = wm8350->dev;
 263         platform_set_drvdata(*pdev, wm8350);
 264         ret = platform_device_add(*pdev);
 265         if (ret != 0) {
 266                 dev_err(wm8350->dev, "Failed to register %s: %d\n", name, ret);
 267                 platform_device_put(*pdev);
 268                 *pdev = NULL;
 269         }
 270 }
 271
 272 int wm8350_device_init(struct wm8350 *wm8350, int irq,
 273                        struct wm8350_platform_data *pdata)
 274 {
 275         int ret;
 276         unsigned int id1, id2, mask_rev;
 277         unsigned int cust_id, mode, chip_rev;
 278
 279         dev_set_drvdata(wm8350->dev, wm8350);
 280
 281         /* get WM8350 revision and config mode */
 282         ret = regmap_read(wm8350->regmap, WM8350_RESET_ID, &id1);
 283         if (ret != 0) {
 284                 dev_err(wm8350->dev, "Failed to read ID: %d\n", ret);
 285                 goto err;
 286         }
 287
 288         ret = regmap_read(wm8350->regmap, WM8350_ID, &id2);
 289         if (ret != 0) {
 290                 dev_err(wm8350->dev, "Failed to read ID: %d\n", ret);
 291                 goto err;
 292         }
 293
 294         ret = regmap_read(wm8350->regmap, WM8350_REVISION, &mask_rev);
 295         if (ret != 0) {
 296                 dev_err(wm8350->dev, "Failed to read revision: %d\n", ret);
 297                 goto err;
 298         }
 299
 300         if (id1 != 0x6143) {
 301                 dev_err(wm8350->dev,
 302                         "Device with ID %x is not a WM8350\n", id1);
 303                 ret = -ENODEV;
 304                 goto err;
 305         }
 306
 307         mode = (id2 & WM8350_CONF_STS_MASK) >> 10;
 308         cust_id = id2 & WM8350_CUST_ID_MASK;
 309         chip_rev = (id2 & WM8350_CHIP_REV_MASK) >> 12;
 310         dev_info(wm8350->dev,
 311                  "CONF_STS %d, CUST_ID %d, MASK_REV %d, CHIP_REV %d\n",
 312                  mode, cust_id, mask_rev, chip_rev);
 313
 314         if (cust_id != 0) {
 315                 dev_err(wm8350->dev, "Unsupported CUST_ID\n");
 316                 ret = -ENODEV;
 317                 goto err;
 318         }
 319
 320         switch (mask_rev) {
 321         case 0:
 322                 wm8350->pmic.max_dcdc = WM8350_DCDC_6;
 323                 wm8350->pmic.max_isink = WM8350_ISINK_B;
 324
 325                 switch (chip_rev) {
 326                 case WM8350_REV_E:
 327                         dev_info(wm8350->dev, "WM8350 Rev E\n");
 328                         break;
 329                 case WM8350_REV_F:
 330                         dev_info(wm8350->dev, "WM8350 Rev F\n");
 331                         break;
 332                 case WM8350_REV_G:
 333                         dev_info(wm8350->dev, "WM8350 Rev G\n");
 334                         wm8350->power.rev_g_coeff = 1;
 335                         break;
 336                 case WM8350_REV_H:
 337                         dev_info(wm8350->dev, "WM8350 Rev H\n");
 338                         wm8350->power.rev_g_coeff = 1;
 339                         break;
 340                 default:
 341                         /* For safety we refuse to run on unknown hardware */
 342                         dev_err(wm8350->dev, "Unknown WM8350 CHIP_REV\n");
 343                         ret = -ENODEV;
 344                         goto err;
 345                 }
 346                 break;
 347
 348         case 1:
 349                 wm8350->pmic.max_dcdc = WM8350_DCDC_4;
 350                 wm8350->pmic.max_isink = WM8350_ISINK_A;
 351
 352                 switch (chip_rev) {
 353                 case 0:
 354                         dev_info(wm8350->dev, "WM8351 Rev A\n");
 355                         wm8350->power.rev_g_coeff = 1;
 356                         break;
 357
 358                 case 1:
 359                         dev_info(wm8350->dev, "WM8351 Rev B\n");
 360                         wm8350->power.rev_g_coeff = 1;
 361                         break;
 362
 363                 default:
 364                         dev_err(wm8350->dev, "Unknown WM8351 CHIP_REV\n");
 365                         ret = -ENODEV;
 366                         goto err;
 367                 }
 368                 break;
 369
 370         case 2:
 371                 wm8350->pmic.max_dcdc = WM8350_DCDC_6;
 372                 wm8350->pmic.max_isink = WM8350_ISINK_B;
 373
 374                 switch (chip_rev) {
 375                 case 0:
 376                         dev_info(wm8350->dev, "WM8352 Rev A\n");
 377                         wm8350->power.rev_g_coeff = 1;
 378                         break;
 379
 380                 default:
 381                         dev_err(wm8350->dev, "Unknown WM8352 CHIP_REV\n");
 382                         ret = -ENODEV;
 383                         goto err;
 384                 }
 385                 break;
 386
 387         default:
 388                 dev_err(wm8350->dev, "Unknown MASK_REV\n");
 389                 ret = -ENODEV;
 390                 goto err;
 391         }
 392
 393         mutex_init(&wm8350->auxadc_mutex);
 394         init_completion(&wm8350->auxadc_done);
 395
 396         ret = wm8350_irq_init(wm8350, irq, pdata);
 397         if (ret < 0)
 398                 goto err;
 399
 400         if (wm8350->irq_base) {
 401                 ret = request_threaded_irq(wm8350->irq_base +
 402                                            WM8350_IRQ_AUXADC_DATARDY,
 403                                            NULL, wm8350_auxadc_irq,
 404                                            IRQF_ONESHOT,
 405                                            "auxadc", wm8350);
 406                 if (ret < 0)
 407                         dev_warn(wm8350->dev,
 408                                  "Failed to request AUXADC IRQ: %d\n", ret);
 409         }
 410
 411         if (pdata && pdata->init) {
 412                 ret = pdata->init(wm8350);
 413                 if (ret != 0) {
 414                         dev_err(wm8350->dev, "Platform init() failed: %d\n",
 415                                 ret);
 416                         goto err_irq;
 417                 }
 418         }
 419
 420         wm8350_reg_write(wm8350, WM8350_SYSTEM_INTERRUPTS_MASK, 0x0);
 421
 422         wm8350_client_dev_register(wm8350, "wm8350-codec",
 423                                    &(wm8350->codec.pdev));
 424         wm8350_client_dev_register(wm8350, "wm8350-gpio",
 425                                    &(wm8350->gpio.pdev));
 426         wm8350_client_dev_register(wm8350, "wm8350-hwmon",
 427                                    &(wm8350->hwmon.pdev));
 428         wm8350_client_dev_register(wm8350, "wm8350-power",
 429                                    &(wm8350->power.pdev));
 430         wm8350_client_dev_register(wm8350, "wm8350-rtc", &(wm8350->rtc.pdev));
 431         wm8350_client_dev_register(wm8350, "wm8350-wdt", &(wm8350->wdt.pdev));
 432
 433         return 0;
 434
 435 err_irq:
 436         wm8350_irq_exit(wm8350);
 437 err:
 438         return ret;
 439 }
 440 EXPORT_SYMBOL_GPL(wm8350_device_init);