drivers/mfd/mc13xxx-core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2009-2010 Pengutronix
   4  * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
   5  *
   6  * loosely based on an earlier driver that has
   7  * Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/of.h>
  12 #include <linux/of_device.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/mfd/core.h>
  15
  16 #include "mc13xxx.h"
  17
  18 #define MC13XXX_IRQSTAT0        0
  19 #define MC13XXX_IRQMASK0        1
  20 #define MC13XXX_IRQSTAT1        3
  21 #define MC13XXX_IRQMASK1        4
  22
  23 #define MC13XXX_REVISION        7
  24 #define MC13XXX_REVISION_REVMETAL       (0x07 <<  0)
  25 #define MC13XXX_REVISION_REVFULL        (0x03 <<  3)
  26 #define MC13XXX_REVISION_ICID           (0x07 <<  6)
  27 #define MC13XXX_REVISION_FIN            (0x03 <<  9)
  28 #define MC13XXX_REVISION_FAB            (0x03 << 11)
  29 #define MC13XXX_REVISION_ICIDCODE       (0x3f << 13)
  30
  31 #define MC34708_REVISION_REVMETAL       (0x07 <<  0)
  32 #define MC34708_REVISION_REVFULL        (0x07 <<  3)
  33 #define MC34708_REVISION_FIN            (0x07 <<  6)
  34 #define MC34708_REVISION_FAB            (0x07 <<  9)
  35
  36 #define MC13XXX_PWRCTRL         15
  37 #define MC13XXX_PWRCTRL_WDIRESET        (1 << 12)
  38
  39 #define MC13XXX_ADC1            44
  40 #define MC13XXX_ADC1_ADEN               (1 << 0)
  41 #define MC13XXX_ADC1_RAND               (1 << 1)
  42 #define MC13XXX_ADC1_ADSEL              (1 << 3)
  43 #define MC13XXX_ADC1_ASC                (1 << 20)
  44 #define MC13XXX_ADC1_ADTRIGIGN          (1 << 21)
  45
  46 #define MC13XXX_ADC2            45
  47
  48 void mc13xxx_lock(struct mc13xxx *mc13xxx)
  49 {
  50         if (!mutex_trylock(&mc13xxx->lock)) {
  51                 dev_dbg(mc13xxx->dev, "wait for %s from %ps\n",
  52                                 __func__, __builtin_return_address(0));
  53
  54                 mutex_lock(&mc13xxx->lock);
  55         }
  56         dev_dbg(mc13xxx->dev, "%s from %ps\n",
  57                         __func__, __builtin_return_address(0));
  58 }
  59 EXPORT_SYMBOL(mc13xxx_lock);
  60
  61 void mc13xxx_unlock(struct mc13xxx *mc13xxx)
  62 {
  63         dev_dbg(mc13xxx->dev, "%s from %ps\n",
  64                         __func__, __builtin_return_address(0));
  65         mutex_unlock(&mc13xxx->lock);
  66 }
  67 EXPORT_SYMBOL(mc13xxx_unlock);
  68
  69 int mc13xxx_reg_read(struct mc13xxx *mc13xxx, unsigned int offset, u32 *val)
  70 {
  71         int ret;
  72
  73         ret = regmap_read(mc13xxx->regmap, offset, val);
  74         dev_vdbg(mc13xxx->dev, "[0x%02x] -> 0x%06x\n", offset, *val);
  75
  76         return ret;
  77 }
  78 EXPORT_SYMBOL(mc13xxx_reg_read);
  79
  80 int mc13xxx_reg_write(struct mc13xxx *mc13xxx, unsigned int offset, u32 val)
  81 {
  82         dev_vdbg(mc13xxx->dev, "[0x%02x] <- 0x%06x\n", offset, val);
  83
  84         if (val >= BIT(24))
  85                 return -EINVAL;
  86
  87         return regmap_write(mc13xxx->regmap, offset, val);
  88 }
  89 EXPORT_SYMBOL(mc13xxx_reg_write);
  90
  91 int mc13xxx_reg_rmw(struct mc13xxx *mc13xxx, unsigned int offset,
  92                 u32 mask, u32 val)
  93 {
  94         BUG_ON(val & ~mask);
  95         dev_vdbg(mc13xxx->dev, "[0x%02x] <- 0x%06x (mask: 0x%06x)\n",
  96                         offset, val, mask);
  97
  98         return regmap_update_bits(mc13xxx->regmap, offset, mask, val);
  99 }
 100 EXPORT_SYMBOL(mc13xxx_reg_rmw);
 101
 102 int mc13xxx_irq_mask(struct mc13xxx *mc13xxx, int irq)
 103 {
 104         int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq);
 105
 106         disable_irq_nosync(virq);
 107
 108         return 0;
 109 }
 110 EXPORT_SYMBOL(mc13xxx_irq_mask);
 111
 112 int mc13xxx_irq_unmask(struct mc13xxx *mc13xxx, int irq)
 113 {
 114         int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq);
 115
 116         enable_irq(virq);
 117
 118         return 0;
 119 }
 120 EXPORT_SYMBOL(mc13xxx_irq_unmask);
 121
 122 int mc13xxx_irq_status(struct mc13xxx *mc13xxx, int irq,
 123                 int *enabled, int *pending)
 124 {
 125         int ret;
 126         unsigned int offmask = irq < 24 ? MC13XXX_IRQMASK0 : MC13XXX_IRQMASK1;
 127         unsigned int offstat = irq < 24 ? MC13XXX_IRQSTAT0 : MC13XXX_IRQSTAT1;
 128         u32 irqbit = 1 << (irq < 24 ? irq : irq - 24);
 129
 130         if (irq < 0 || irq >= ARRAY_SIZE(mc13xxx->irqs))
 131                 return -EINVAL;
 132
 133         if (enabled) {
 134                 u32 mask;
 135
 136                 ret = mc13xxx_reg_read(mc13xxx, offmask, &mask);
 137                 if (ret)
 138                         return ret;
 139
 140                 *enabled = mask & irqbit;
 141         }
 142
 143         if (pending) {
 144                 u32 stat;
 145
 146                 ret = mc13xxx_reg_read(mc13xxx, offstat, &stat);
 147                 if (ret)
 148                         return ret;
 149
 150                 *pending = stat & irqbit;
 151         }
 152
 153         return 0;
 154 }
 155 EXPORT_SYMBOL(mc13xxx_irq_status);
 156
 157 int mc13xxx_irq_request(struct mc13xxx *mc13xxx, int irq,
 158                 irq_handler_t handler, const char *name, void *dev)
 159 {
 160         int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq);
 161
 162         return devm_request_threaded_irq(mc13xxx->dev, virq, NULL, handler,
 163                                          IRQF_ONESHOT, name, dev);
 164 }
 165 EXPORT_SYMBOL(mc13xxx_irq_request);
 166
 167 int mc13xxx_irq_free(struct mc13xxx *mc13xxx, int irq, void *dev)
 168 {
 169         int virq = regmap_irq_get_virq(mc13xxx->irq_data, irq);
 170
 171         devm_free_irq(mc13xxx->dev, virq, dev);
 172
 173         return 0;
 174 }
 175 EXPORT_SYMBOL(mc13xxx_irq_free);
 176
 177 #define maskval(reg, mask)      (((reg) & (mask)) >> __ffs(mask))
 178 static void mc13xxx_print_revision(struct mc13xxx *mc13xxx, u32 revision)
 179 {
 180         dev_info(mc13xxx->dev, "%s: rev: %d.%d, "
 181                         "fin: %d, fab: %d, icid: %d/%d\n",
 182                         mc13xxx->variant->name,
 183                         maskval(revision, MC13XXX_REVISION_REVFULL),
 184                         maskval(revision, MC13XXX_REVISION_REVMETAL),
 185                         maskval(revision, MC13XXX_REVISION_FIN),
 186                         maskval(revision, MC13XXX_REVISION_FAB),
 187                         maskval(revision, MC13XXX_REVISION_ICID),
 188                         maskval(revision, MC13XXX_REVISION_ICIDCODE));
 189 }
 190
 191 static void mc34708_print_revision(struct mc13xxx *mc13xxx, u32 revision)
 192 {
 193         dev_info(mc13xxx->dev, "%s: rev %d.%d, fin: %d, fab: %d\n",
 194                         mc13xxx->variant->name,
 195                         maskval(revision, MC34708_REVISION_REVFULL),
 196                         maskval(revision, MC34708_REVISION_REVMETAL),
 197                         maskval(revision, MC34708_REVISION_FIN),
 198                         maskval(revision, MC34708_REVISION_FAB));
 199 }
 200
 201 /* These are only exported for mc13xxx-i2c and mc13xxx-spi */
 202 struct mc13xxx_variant mc13xxx_variant_mc13783 = {
 203         .name = "mc13783",
 204         .print_revision = mc13xxx_print_revision,
 205 };
 206 EXPORT_SYMBOL_GPL(mc13xxx_variant_mc13783);
 207
 208 struct mc13xxx_variant mc13xxx_variant_mc13892 = {
 209         .name = "mc13892",
 210         .print_revision = mc13xxx_print_revision,
 211 };
 212 EXPORT_SYMBOL_GPL(mc13xxx_variant_mc13892);
 213
 214 struct mc13xxx_variant mc13xxx_variant_mc34708 = {
 215         .name = "mc34708",
 216         .print_revision = mc34708_print_revision,
 217 };
 218 EXPORT_SYMBOL_GPL(mc13xxx_variant_mc34708);
 219
 220 static const char *mc13xxx_get_chipname(struct mc13xxx *mc13xxx)
 221 {
 222         return mc13xxx->variant->name;
 223 }
 224
 225 int mc13xxx_get_flags(struct mc13xxx *mc13xxx)
 226 {
 227         return mc13xxx->flags;
 228 }
 229 EXPORT_SYMBOL(mc13xxx_get_flags);
 230
 231 #define MC13XXX_ADC1_CHAN0_SHIFT        5
 232 #define MC13XXX_ADC1_CHAN1_SHIFT        8
 233 #define MC13783_ADC1_ATO_SHIFT          11
 234 #define MC13783_ADC1_ATOX               (1 << 19)
 235
 236 struct mc13xxx_adcdone_data {
 237         struct mc13xxx *mc13xxx;
 238         struct completion done;
 239 };
 240
 241 static irqreturn_t mc13xxx_handler_adcdone(int irq, void *data)
 242 {
 243         struct mc13xxx_adcdone_data *adcdone_data = data;
 244
 245         complete_all(&adcdone_data->done);
 246
 247         return IRQ_HANDLED;
 248 }
 249
 250 #define MC13XXX_ADC_WORKING (1 << 0)
 251
 252 int mc13xxx_adc_do_conversion(struct mc13xxx *mc13xxx, unsigned int mode,
 253                 unsigned int channel, u8 ato, bool atox,
 254                 unsigned int *sample)
 255 {
 256         u32 adc0, adc1, old_adc0;
 257         int i, ret;
 258         struct mc13xxx_adcdone_data adcdone_data = {
 259                 .mc13xxx = mc13xxx,
 260         };
 261         init_completion(&adcdone_data.done);
 262
 263         dev_dbg(mc13xxx->dev, "%s\n", __func__);
 264
 265         mc13xxx_lock(mc13xxx);
 266
 267         if (mc13xxx->adcflags & MC13XXX_ADC_WORKING) {
 268                 ret = -EBUSY;
 269                 goto out;
 270         }
 271
 272         mc13xxx->adcflags |= MC13XXX_ADC_WORKING;
 273
 274         ret = mc13xxx_reg_read(mc13xxx, MC13XXX_ADC0, &old_adc0);
 275         if (ret)
 276                 goto out;
 277
 278         adc0 = MC13XXX_ADC0_ADINC1 | MC13XXX_ADC0_ADINC2 |
 279                MC13XXX_ADC0_CHRGRAWDIV;
 280         adc1 = MC13XXX_ADC1_ADEN | MC13XXX_ADC1_ADTRIGIGN | MC13XXX_ADC1_ASC;
 281
 282         /*
 283          * Channels mapped through ADIN7:
 284          * 7  - General purpose ADIN7
 285          * 16 - UID
 286          * 17 - Die temperature
 287          */
 288         if (channel > 7 && channel < 16) {
 289                 adc1 |= MC13XXX_ADC1_ADSEL;
 290         } else if (channel == 16) {
 291                 adc0 |= MC13XXX_ADC0_ADIN7SEL_UID;
 292                 channel = 7;
 293         } else if (channel == 17) {
 294                 adc0 |= MC13XXX_ADC0_ADIN7SEL_DIE;
 295                 channel = 7;
 296         }
 297
 298         switch (mode) {
 299         case MC13XXX_ADC_MODE_TS:
 300                 adc0 |= MC13XXX_ADC0_ADREFEN | MC13XXX_ADC0_TSMOD0 |
 301                         MC13XXX_ADC0_TSMOD1;
 302                 adc1 |= 4 << MC13XXX_ADC1_CHAN1_SHIFT;
 303                 break;
 304
 305         case MC13XXX_ADC_MODE_SINGLE_CHAN:
 306                 adc0 |= old_adc0 & MC13XXX_ADC0_CONFIG_MASK;
 307                 adc1 |= (channel & 0x7) << MC13XXX_ADC1_CHAN0_SHIFT;
 308                 adc1 |= MC13XXX_ADC1_RAND;
 309                 break;
 310
 311         case MC13XXX_ADC_MODE_MULT_CHAN:
 312                 adc0 |= old_adc0 & MC13XXX_ADC0_CONFIG_MASK;
 313                 adc1 |= 4 << MC13XXX_ADC1_CHAN1_SHIFT;
 314                 break;
 315
 316         default:
 317                 mc13xxx_unlock(mc13xxx);
 318                 return -EINVAL;
 319         }
 320
 321         adc1 |= ato << MC13783_ADC1_ATO_SHIFT;
 322         if (atox)
 323                 adc1 |= MC13783_ADC1_ATOX;
 324
 325         dev_dbg(mc13xxx->dev, "%s: request irq\n", __func__);
 326         mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_ADCDONE,
 327                         mc13xxx_handler_adcdone, __func__, &adcdone_data);
 328
 329         mc13xxx_reg_write(mc13xxx, MC13XXX_ADC0, adc0);
 330         mc13xxx_reg_write(mc13xxx, MC13XXX_ADC1, adc1);
 331
 332         mc13xxx_unlock(mc13xxx);
 333
 334         ret = wait_for_completion_interruptible_timeout(&adcdone_data.done, HZ);
 335
 336         if (!ret)
 337                 ret = -ETIMEDOUT;
 338
 339         mc13xxx_lock(mc13xxx);
 340
 341         mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_ADCDONE, &adcdone_data);
 342
 343         if (ret > 0)
 344                 for (i = 0; i < 4; ++i) {
 345                         ret = mc13xxx_reg_read(mc13xxx,
 346                                         MC13XXX_ADC2, &sample[i]);
 347                         if (ret)
 348                                 break;
 349                 }
 350
 351         if (mode == MC13XXX_ADC_MODE_TS)
 352                 /* restore TSMOD */
 353                 mc13xxx_reg_write(mc13xxx, MC13XXX_ADC0, old_adc0);
 354
 355         mc13xxx->adcflags &= ~MC13XXX_ADC_WORKING;
 356 out:
 357         mc13xxx_unlock(mc13xxx);
 358
 359         return ret;
 360 }
 361 EXPORT_SYMBOL_GPL(mc13xxx_adc_do_conversion);
 362
 363 static int mc13xxx_add_subdevice_pdata(struct mc13xxx *mc13xxx,
 364                 const char *format, void *pdata, size_t pdata_size)
 365 {
 366         char buf[30];
 367         const char *name = mc13xxx_get_chipname(mc13xxx);
 368
 369         struct mfd_cell cell = {
 370                 .platform_data = pdata,
 371                 .pdata_size = pdata_size,
 372         };
 373
 374         /* there is no asnprintf in the kernel :-( */
 375         if (snprintf(buf, sizeof(buf), format, name) > sizeof(buf))
 376                 return -E2BIG;
 377
 378         cell.name = kmemdup(buf, strlen(buf) + 1, GFP_KERNEL);
 379         if (!cell.name)
 380                 return -ENOMEM;
 381
 382         return mfd_add_devices(mc13xxx->dev, -1, &cell, 1, NULL, 0,
 383                                regmap_irq_get_domain(mc13xxx->irq_data));
 384 }
 385
 386 static int mc13xxx_add_subdevice(struct mc13xxx *mc13xxx, const char *format)
 387 {
 388         return mc13xxx_add_subdevice_pdata(mc13xxx, format, NULL, 0);
 389 }
 390
 391 #ifdef CONFIG_OF
 392 static int mc13xxx_probe_flags_dt(struct mc13xxx *mc13xxx)
 393 {
 394         struct device_node *np = mc13xxx->dev->of_node;
 395
 396         if (!np)
 397                 return -ENODEV;
 398
 399         if (of_property_read_bool(np, "fsl,mc13xxx-uses-adc"))
 400                 mc13xxx->flags |= MC13XXX_USE_ADC;
 401
 402         if (of_property_read_bool(np, "fsl,mc13xxx-uses-codec"))
 403                 mc13xxx->flags |= MC13XXX_USE_CODEC;
 404
 405         if (of_property_read_bool(np, "fsl,mc13xxx-uses-rtc"))
 406                 mc13xxx->flags |= MC13XXX_USE_RTC;
 407
 408         if (of_property_read_bool(np, "fsl,mc13xxx-uses-touch"))
 409                 mc13xxx->flags |= MC13XXX_USE_TOUCHSCREEN;
 410
 411         return 0;
 412 }
 413 #else
 414 static inline int mc13xxx_probe_flags_dt(struct mc13xxx *mc13xxx)
 415 {
 416         return -ENODEV;
 417 }
 418 #endif
 419
 420 int mc13xxx_common_init(struct device *dev)
 421 {
 422         struct mc13xxx_platform_data *pdata = dev_get_platdata(dev);
 423         struct mc13xxx *mc13xxx = dev_get_drvdata(dev);
 424         u32 revision;
 425         int i, ret;
 426
 427         mc13xxx->dev = dev;
 428
 429         ret = mc13xxx_reg_read(mc13xxx, MC13XXX_REVISION, &revision);
 430         if (ret)
 431                 return ret;
 432
 433         mc13xxx->variant->print_revision(mc13xxx, revision);
 434
 435         ret = mc13xxx_reg_rmw(mc13xxx, MC13XXX_PWRCTRL,
 436                         MC13XXX_PWRCTRL_WDIRESET, MC13XXX_PWRCTRL_WDIRESET);
 437         if (ret)
 438                 return ret;
 439
 440         for (i = 0; i < ARRAY_SIZE(mc13xxx->irqs); i++) {
 441                 mc13xxx->irqs[i].reg_offset = i / MC13XXX_IRQ_PER_REG;
 442                 mc13xxx->irqs[i].mask = BIT(i % MC13XXX_IRQ_PER_REG);
 443         }
 444
 445         mc13xxx->irq_chip.name = dev_name(dev);
 446         mc13xxx->irq_chip.status_base = MC13XXX_IRQSTAT0;
 447         mc13xxx->irq_chip.mask_base = MC13XXX_IRQMASK0;
 448         mc13xxx->irq_chip.ack_base = MC13XXX_IRQSTAT0;
 449         mc13xxx->irq_chip.irq_reg_stride = MC13XXX_IRQSTAT1 - MC13XXX_IRQSTAT0;
 450         mc13xxx->irq_chip.init_ack_masked = true;
 451         mc13xxx->irq_chip.use_ack = true;
 452         mc13xxx->irq_chip.num_regs = MC13XXX_IRQ_REG_CNT;
 453         mc13xxx->irq_chip.irqs = mc13xxx->irqs;
 454         mc13xxx->irq_chip.num_irqs = ARRAY_SIZE(mc13xxx->irqs);
 455
 456         ret = regmap_add_irq_chip(mc13xxx->regmap, mc13xxx->irq, IRQF_ONESHOT,
 457                                   0, &mc13xxx->irq_chip, &mc13xxx->irq_data);
 458         if (ret)
 459                 return ret;
 460
 461         mutex_init(&mc13xxx->lock);
 462
 463         if (mc13xxx_probe_flags_dt(mc13xxx) < 0 && pdata)
 464                 mc13xxx->flags = pdata->flags;
 465
 466         if (pdata) {
 467                 mc13xxx_add_subdevice_pdata(mc13xxx, "%s-regulator",
 468                         &pdata->regulators, sizeof(pdata->regulators));
 469                 mc13xxx_add_subdevice_pdata(mc13xxx, "%s-led",
 470                                 pdata->leds, sizeof(*pdata->leds));
 471                 mc13xxx_add_subdevice_pdata(mc13xxx, "%s-pwrbutton",
 472                                 pdata->buttons, sizeof(*pdata->buttons));
 473                 if (mc13xxx->flags & MC13XXX_USE_CODEC)
 474                         mc13xxx_add_subdevice_pdata(mc13xxx, "%s-codec",
 475                                 pdata->codec, sizeof(*pdata->codec));
 476                 if (mc13xxx->flags & MC13XXX_USE_TOUCHSCREEN)
 477                         mc13xxx_add_subdevice_pdata(mc13xxx, "%s-ts",
 478                                 &pdata->touch, sizeof(pdata->touch));
 479         } else {
 480                 mc13xxx_add_subdevice(mc13xxx, "%s-regulator");
 481                 mc13xxx_add_subdevice(mc13xxx, "%s-led");
 482                 mc13xxx_add_subdevice(mc13xxx, "%s-pwrbutton");
 483                 if (mc13xxx->flags & MC13XXX_USE_CODEC)
 484                         mc13xxx_add_subdevice(mc13xxx, "%s-codec");
 485                 if (mc13xxx->flags & MC13XXX_USE_TOUCHSCREEN)
 486                         mc13xxx_add_subdevice(mc13xxx, "%s-ts");
 487         }
 488
 489         if (mc13xxx->flags & MC13XXX_USE_ADC)
 490                 mc13xxx_add_subdevice(mc13xxx, "%s-adc");
 491
 492         if (mc13xxx->flags & MC13XXX_USE_RTC)
 493                 mc13xxx_add_subdevice(mc13xxx, "%s-rtc");
 494
 495         return 0;
 496 }
 497 EXPORT_SYMBOL_GPL(mc13xxx_common_init);
 498
 499 int mc13xxx_common_exit(struct device *dev)
 500 {
 501         struct mc13xxx *mc13xxx = dev_get_drvdata(dev);
 502
 503         mfd_remove_devices(dev);
 504         regmap_del_irq_chip(mc13xxx->irq, mc13xxx->irq_data);
 505         mutex_destroy(&mc13xxx->lock);
 506
 507         return 0;
 508 }
 509 EXPORT_SYMBOL_GPL(mc13xxx_common_exit);
 510
 511 MODULE_DESCRIPTION("Core driver for Freescale MC13XXX PMIC");
 512 MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
 513 MODULE_LICENSE("GPL v2");