drivers/pinctrl/pinctrl-sx150x.c

   1 /*
   2  * Copyright (c) 2016, BayLibre, SAS. All rights reserved.
   3  * Author: Neil Armstrong <narmstrong@baylibre.com>
   4  *
   5  * Copyright (c) 2010, Code Aurora Forum. All rights reserved.
   6  *
   7  * Driver for Semtech SX150X I2C GPIO Expanders
   8  *
   9  * Author: Gregory Bean <gbean@codeaurora.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 and
  13  * only version 2 as published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  */
  20
  21 #include <linux/regmap.h>
  22 #include <linux/i2c.h>
  23 #include <linux/init.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/irq.h>
  26 #include <linux/mutex.h>
  27 #include <linux/slab.h>
  28 #include <linux/of.h>
  29 #include <linux/of_device.h>
  30 #include <linux/gpio/driver.h>
  31 #include <linux/pinctrl/pinconf.h>
  32 #include <linux/pinctrl/pinctrl.h>
  33 #include <linux/pinctrl/pinmux.h>
  34 #include <linux/pinctrl/pinconf-generic.h>
  35
  36 #include "core.h"
  37 #include "pinconf.h"
  38 #include "pinctrl-utils.h"
  39
  40 /* The chip models of sx150x */
  41 enum {
  42         SX150X_123 = 0,
  43         SX150X_456,
  44         SX150X_789,
  45 };
  46 enum {
  47         SX150X_789_REG_MISC_AUTOCLEAR_OFF = 1 << 0,
  48         SX150X_MAX_REGISTER = 0xad,
  49         SX150X_IRQ_TYPE_EDGE_RISING = 0x1,
  50         SX150X_IRQ_TYPE_EDGE_FALLING = 0x2,
  51         SX150X_789_RESET_KEY1 = 0x12,
  52         SX150X_789_RESET_KEY2 = 0x34,
  53 };
  54
  55 struct sx150x_123_pri {
  56         u8 reg_pld_mode;
  57         u8 reg_pld_table0;
  58         u8 reg_pld_table1;
  59         u8 reg_pld_table2;
  60         u8 reg_pld_table3;
  61         u8 reg_pld_table4;
  62         u8 reg_advance;
  63 };
  64
  65 struct sx150x_456_pri {
  66         u8 reg_pld_mode;
  67         u8 reg_pld_table0;
  68         u8 reg_pld_table1;
  69         u8 reg_pld_table2;
  70         u8 reg_pld_table3;
  71         u8 reg_pld_table4;
  72         u8 reg_advance;
  73 };
  74
  75 struct sx150x_789_pri {
  76         u8 reg_drain;
  77         u8 reg_polarity;
  78         u8 reg_clock;
  79         u8 reg_misc;
  80         u8 reg_reset;
  81         u8 ngpios;
  82 };
  83
  84 struct sx150x_device_data {
  85         u8 model;
  86         u8 reg_pullup;
  87         u8 reg_pulldn;
  88         u8 reg_dir;
  89         u8 reg_data;
  90         u8 reg_irq_mask;
  91         u8 reg_irq_src;
  92         u8 reg_sense;
  93         u8 ngpios;
  94         union {
  95                 struct sx150x_123_pri x123;
  96                 struct sx150x_456_pri x456;
  97                 struct sx150x_789_pri x789;
  98         } pri;
  99         const struct pinctrl_pin_desc *pins;
 100         unsigned int npins;
 101 };
 102
 103 struct sx150x_pinctrl {
 104         struct device *dev;
 105         struct i2c_client *client;
 106         struct pinctrl_dev *pctldev;
 107         struct pinctrl_desc pinctrl_desc;
 108         struct gpio_chip gpio;
 109         struct irq_chip irq_chip;
 110         struct regmap *regmap;
 111         struct {
 112                 u32 sense;
 113                 u32 masked;
 114         } irq;
 115         struct mutex lock;
 116         const struct sx150x_device_data *data;
 117 };
 118
 119 static const struct pinctrl_pin_desc sx150x_8_pins[] = {
 120         PINCTRL_PIN(0, "gpio0"),
 121         PINCTRL_PIN(1, "gpio1"),
 122         PINCTRL_PIN(2, "gpio2"),
 123         PINCTRL_PIN(3, "gpio3"),
 124         PINCTRL_PIN(4, "gpio4"),
 125         PINCTRL_PIN(5, "gpio5"),
 126         PINCTRL_PIN(6, "gpio6"),
 127         PINCTRL_PIN(7, "gpio7"),
 128         PINCTRL_PIN(8, "oscio"),
 129 };
 130
 131 static const struct pinctrl_pin_desc sx150x_16_pins[] = {
 132         PINCTRL_PIN(0, "gpio0"),
 133         PINCTRL_PIN(1, "gpio1"),
 134         PINCTRL_PIN(2, "gpio2"),
 135         PINCTRL_PIN(3, "gpio3"),
 136         PINCTRL_PIN(4, "gpio4"),
 137         PINCTRL_PIN(5, "gpio5"),
 138         PINCTRL_PIN(6, "gpio6"),
 139         PINCTRL_PIN(7, "gpio7"),
 140         PINCTRL_PIN(8, "gpio8"),
 141         PINCTRL_PIN(9, "gpio9"),
 142         PINCTRL_PIN(10, "gpio10"),
 143         PINCTRL_PIN(11, "gpio11"),
 144         PINCTRL_PIN(12, "gpio12"),
 145         PINCTRL_PIN(13, "gpio13"),
 146         PINCTRL_PIN(14, "gpio14"),
 147         PINCTRL_PIN(15, "gpio15"),
 148         PINCTRL_PIN(16, "oscio"),
 149 };
 150
 151 static const struct sx150x_device_data sx1508q_device_data = {
 152         .model = SX150X_789,
 153         .reg_pullup     = 0x03,
 154         .reg_pulldn     = 0x04,
 155         .reg_dir        = 0x07,
 156         .reg_data       = 0x08,
 157         .reg_irq_mask   = 0x09,
 158         .reg_irq_src    = 0x0c,
 159         .reg_sense      = 0x0b,
 160         .pri.x789 = {
 161                 .reg_drain      = 0x05,
 162                 .reg_polarity   = 0x06,
 163                 .reg_clock      = 0x0f,
 164                 .reg_misc       = 0x10,
 165                 .reg_reset      = 0x7d,
 166         },
 167         .ngpios = 8,
 168         .pins = sx150x_8_pins,
 169         .npins = ARRAY_SIZE(sx150x_8_pins),
 170 };
 171
 172 static const struct sx150x_device_data sx1509q_device_data = {
 173         .model = SX150X_789,
 174         .reg_pullup     = 0x06,
 175         .reg_pulldn     = 0x08,
 176         .reg_dir        = 0x0e,
 177         .reg_data       = 0x10,
 178         .reg_irq_mask   = 0x12,
 179         .reg_irq_src    = 0x18,
 180         .reg_sense      = 0x14,
 181         .pri.x789 = {
 182                 .reg_drain      = 0x0a,
 183                 .reg_polarity   = 0x0c,
 184                 .reg_clock      = 0x1e,
 185                 .reg_misc       = 0x1f,
 186                 .reg_reset      = 0x7d,
 187         },
 188         .ngpios = 16,
 189         .pins = sx150x_16_pins,
 190         .npins = ARRAY_SIZE(sx150x_16_pins),
 191 };
 192
 193 static const struct sx150x_device_data sx1506q_device_data = {
 194         .model = SX150X_456,
 195         .reg_pullup     = 0x04,
 196         .reg_pulldn     = 0x06,
 197         .reg_dir        = 0x02,
 198         .reg_data       = 0x00,
 199         .reg_irq_mask   = 0x08,
 200         .reg_irq_src    = 0x0e,
 201         .reg_sense      = 0x0a,
 202         .pri.x456 = {
 203                 .reg_pld_mode   = 0x20,
 204                 .reg_pld_table0 = 0x22,
 205                 .reg_pld_table1 = 0x24,
 206                 .reg_pld_table2 = 0x26,
 207                 .reg_pld_table3 = 0x28,
 208                 .reg_pld_table4 = 0x2a,
 209                 .reg_advance    = 0xad,
 210         },
 211         .ngpios = 16,
 212         .pins = sx150x_16_pins,
 213         .npins = 16, /* oscio not available */
 214 };
 215
 216 static const struct sx150x_device_data sx1502q_device_data = {
 217         .model = SX150X_123,
 218         .reg_pullup     = 0x02,
 219         .reg_pulldn     = 0x03,
 220         .reg_dir        = 0x01,
 221         .reg_data       = 0x00,
 222         .reg_irq_mask   = 0x05,
 223         .reg_irq_src    = 0x08,
 224         .reg_sense      = 0x07,
 225         .pri.x123 = {
 226                 .reg_pld_mode   = 0x10,
 227                 .reg_pld_table0 = 0x11,
 228                 .reg_pld_table1 = 0x12,
 229                 .reg_pld_table2 = 0x13,
 230                 .reg_pld_table3 = 0x14,
 231                 .reg_pld_table4 = 0x15,
 232                 .reg_advance    = 0xad,
 233         },
 234         .ngpios = 8,
 235         .pins = sx150x_8_pins,
 236         .npins = 8, /* oscio not available */
 237 };
 238
 239 static const struct sx150x_device_data sx1503q_device_data = {
 240         .model = SX150X_123,
 241         .reg_pullup     = 0x04,
 242         .reg_pulldn     = 0x06,
 243         .reg_dir        = 0x02,
 244         .reg_data       = 0x00,
 245         .reg_irq_mask   = 0x08,
 246         .reg_irq_src    = 0x0e,
 247         .reg_sense      = 0x0a,
 248         .pri.x123 = {
 249                 .reg_pld_mode   = 0x20,
 250                 .reg_pld_table0 = 0x22,
 251                 .reg_pld_table1 = 0x24,
 252                 .reg_pld_table2 = 0x26,
 253                 .reg_pld_table3 = 0x28,
 254                 .reg_pld_table4 = 0x2a,
 255                 .reg_advance    = 0xad,
 256         },
 257         .ngpios = 16,
 258         .pins = sx150x_16_pins,
 259         .npins  = 16, /* oscio not available */
 260 };
 261
 262 static int sx150x_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
 263 {
 264         return 0;
 265 }
 266
 267 static const char *sx150x_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
 268                                                 unsigned int group)
 269 {
 270         return NULL;
 271 }
 272
 273 static int sx150x_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
 274                                         unsigned int group,
 275                                         const unsigned int **pins,
 276                                         unsigned int *num_pins)
 277 {
 278         return -ENOTSUPP;
 279 }
 280
 281 static const struct pinctrl_ops sx150x_pinctrl_ops = {
 282         .get_groups_count = sx150x_pinctrl_get_groups_count,
 283         .get_group_name = sx150x_pinctrl_get_group_name,
 284         .get_group_pins = sx150x_pinctrl_get_group_pins,
 285 #ifdef CONFIG_OF
 286         .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
 287         .dt_free_map = pinctrl_utils_free_map,
 288 #endif
 289 };
 290
 291 static bool sx150x_pin_is_oscio(struct sx150x_pinctrl *pctl, unsigned int pin)
 292 {
 293         if (pin >= pctl->data->npins)
 294                 return false;
 295
 296         /* OSCIO pin is only present in 789 devices */
 297         if (pctl->data->model != SX150X_789)
 298                 return false;
 299
 300         return !strcmp(pctl->data->pins[pin].name, "oscio");
 301 }
 302
 303 static int sx150x_gpio_get_direction(struct gpio_chip *chip,
 304                                       unsigned int offset)
 305 {
 306         struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
 307         unsigned int value;
 308         int ret;
 309
 310         if (sx150x_pin_is_oscio(pctl, offset))
 311                 return false;
 312
 313         ret = regmap_read(pctl->regmap, pctl->data->reg_dir, &value);
 314         if (ret < 0)
 315                 return ret;
 316
 317         return !!(value & BIT(offset));
 318 }
 319
 320 static int sx150x_gpio_get(struct gpio_chip *chip, unsigned int offset)
 321 {
 322         struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
 323         unsigned int value;
 324         int ret;
 325
 326         if (sx150x_pin_is_oscio(pctl, offset))
 327                 return -EINVAL;
 328
 329         ret = regmap_read(pctl->regmap, pctl->data->reg_data, &value);
 330         if (ret < 0)
 331                 return ret;
 332
 333         return !!(value & BIT(offset));
 334 }
 335
 336 static int sx150x_gpio_set_single_ended(struct gpio_chip *chip,
 337                                         unsigned int offset,
 338                                         enum single_ended_mode mode)
 339 {
 340         struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
 341         int ret;
 342
 343         switch (mode) {
 344         case LINE_MODE_PUSH_PULL:
 345                 if (pctl->data->model != SX150X_789 ||
 346                     sx150x_pin_is_oscio(pctl, offset))
 347                         return 0;
 348
 349                 ret = regmap_write_bits(pctl->regmap,
 350                                         pctl->data->pri.x789.reg_drain,
 351                                         BIT(offset), 0);
 352                 break;
 353
 354         case LINE_MODE_OPEN_DRAIN:
 355                 if (pctl->data->model != SX150X_789 ||
 356                     sx150x_pin_is_oscio(pctl, offset))
 357                         return -ENOTSUPP;
 358
 359                 ret = regmap_write_bits(pctl->regmap,
 360                                         pctl->data->pri.x789.reg_drain,
 361                                         BIT(offset), BIT(offset));
 362                 break;
 363         default:
 364                 ret = -ENOTSUPP;
 365                 break;
 366         }
 367
 368         return ret;
 369 }
 370
 371 static int __sx150x_gpio_set(struct sx150x_pinctrl *pctl, unsigned int offset,
 372                              int value)
 373 {
 374         return regmap_write_bits(pctl->regmap, pctl->data->reg_data,
 375                                  BIT(offset), value ? BIT(offset) : 0);
 376 }
 377
 378 static int sx150x_gpio_oscio_set(struct sx150x_pinctrl *pctl,
 379                                  int value)
 380 {
 381         return regmap_write(pctl->regmap,
 382                             pctl->data->pri.x789.reg_clock,
 383                             (value ? 0x1f : 0x10));
 384 }
 385
 386 static void sx150x_gpio_set(struct gpio_chip *chip, unsigned int offset,
 387                             int value)
 388 {
 389         struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
 390
 391         if (sx150x_pin_is_oscio(pctl, offset))
 392                 sx150x_gpio_oscio_set(pctl, value);
 393         else
 394                 __sx150x_gpio_set(pctl, offset, value);
 395
 396 }
 397
 398 static int sx150x_gpio_direction_input(struct gpio_chip *chip,
 399                                        unsigned int offset)
 400 {
 401         struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
 402
 403         if (sx150x_pin_is_oscio(pctl, offset))
 404                 return -EINVAL;
 405
 406         return regmap_write_bits(pctl->regmap,
 407                                  pctl->data->reg_dir,
 408                                  BIT(offset), BIT(offset));
 409 }
 410
 411 static int sx150x_gpio_direction_output(struct gpio_chip *chip,
 412                                         unsigned int offset, int value)
 413 {
 414         struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
 415         int ret;
 416
 417         if (sx150x_pin_is_oscio(pctl, offset))
 418                 return sx150x_gpio_oscio_set(pctl, value);
 419
 420         ret = __sx150x_gpio_set(pctl, offset, value);
 421         if (ret < 0)
 422                 return ret;
 423
 424         return regmap_write_bits(pctl->regmap,
 425                                  pctl->data->reg_dir,
 426                                  BIT(offset), 0);
 427 }
 428
 429 static void sx150x_irq_mask(struct irq_data *d)
 430 {
 431         struct sx150x_pinctrl *pctl =
 432                         gpiochip_get_data(irq_data_get_irq_chip_data(d));
 433         unsigned int n = d->hwirq;
 434
 435         pctl->irq.masked |= BIT(n);
 436 }
 437
 438 static void sx150x_irq_unmask(struct irq_data *d)
 439 {
 440         struct sx150x_pinctrl *pctl =
 441                         gpiochip_get_data(irq_data_get_irq_chip_data(d));
 442         unsigned int n = d->hwirq;
 443
 444         pctl->irq.masked &= ~BIT(n);
 445 }
 446
 447 static void sx150x_irq_set_sense(struct sx150x_pinctrl *pctl,
 448                                  unsigned int line, unsigned int sense)
 449 {
 450         /*
 451          * Every interrupt line is represented by two bits shifted
 452          * proportionally to the line number
 453          */
 454         const unsigned int n = line * 2;
 455         const unsigned int mask = ~((SX150X_IRQ_TYPE_EDGE_RISING |
 456                                      SX150X_IRQ_TYPE_EDGE_FALLING) << n);
 457
 458         pctl->irq.sense &= mask;
 459         pctl->irq.sense |= sense << n;
 460 }
 461
 462 static int sx150x_irq_set_type(struct irq_data *d, unsigned int flow_type)
 463 {
 464         struct sx150x_pinctrl *pctl =
 465                         gpiochip_get_data(irq_data_get_irq_chip_data(d));
 466         unsigned int n, val = 0;
 467
 468         if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
 469                 return -EINVAL;
 470
 471         n = d->hwirq;
 472
 473         if (flow_type & IRQ_TYPE_EDGE_RISING)
 474                 val |= SX150X_IRQ_TYPE_EDGE_RISING;
 475         if (flow_type & IRQ_TYPE_EDGE_FALLING)
 476                 val |= SX150X_IRQ_TYPE_EDGE_FALLING;
 477
 478         sx150x_irq_set_sense(pctl, n, val);
 479         return 0;
 480 }
 481
 482 static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
 483 {
 484         struct sx150x_pinctrl *pctl = (struct sx150x_pinctrl *)dev_id;
 485         unsigned long n, status;
 486         unsigned int val;
 487         int err;
 488
 489         err = regmap_read(pctl->regmap, pctl->data->reg_irq_src, &val);
 490         if (err < 0)
 491                 return IRQ_NONE;
 492
 493         err = regmap_write(pctl->regmap, pctl->data->reg_irq_src, val);
 494         if (err < 0)
 495                 return IRQ_NONE;
 496
 497         status = val;
 498         for_each_set_bit(n, &status, pctl->data->ngpios)
 499                 handle_nested_irq(irq_find_mapping(pctl->gpio.irqdomain, n));
 500
 501         return IRQ_HANDLED;
 502 }
 503
 504 static void sx150x_irq_bus_lock(struct irq_data *d)
 505 {
 506         struct sx150x_pinctrl *pctl =
 507                         gpiochip_get_data(irq_data_get_irq_chip_data(d));
 508
 509         mutex_lock(&pctl->lock);
 510 }
 511
 512 static void sx150x_irq_bus_sync_unlock(struct irq_data *d)
 513 {
 514         struct sx150x_pinctrl *pctl =
 515                         gpiochip_get_data(irq_data_get_irq_chip_data(d));
 516
 517         regmap_write(pctl->regmap, pctl->data->reg_irq_mask, pctl->irq.masked);
 518         regmap_write(pctl->regmap, pctl->data->reg_sense, pctl->irq.sense);
 519         mutex_unlock(&pctl->lock);
 520 }
 521
 522 static int sx150x_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
 523                               unsigned long *config)
 524 {
 525         struct sx150x_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 526         unsigned int param = pinconf_to_config_param(*config);
 527         int ret;
 528         u32 arg;
 529         unsigned int data;
 530
 531         if (sx150x_pin_is_oscio(pctl, pin)) {
 532                 switch (param) {
 533                 case PIN_CONFIG_DRIVE_PUSH_PULL:
 534                 case PIN_CONFIG_OUTPUT:
 535                         ret = regmap_read(pctl->regmap,
 536                                           pctl->data->pri.x789.reg_clock,
 537                                           &data);
 538                         if (ret < 0)
 539                                 return ret;
 540
 541                         if (param == PIN_CONFIG_DRIVE_PUSH_PULL)
 542                                 arg = (data & 0x1f) ? 1 : 0;
 543                         else {
 544                                 if ((data & 0x1f) == 0x1f)
 545                                         arg = 1;
 546                                 else if ((data & 0x1f) == 0x10)
 547                                         arg = 0;
 548                                 else
 549                                         return -EINVAL;
 550                         }
 551
 552                         break;
 553                 default:
 554                         return -ENOTSUPP;
 555                 }
 556
 557                 goto out;
 558         }
 559
 560         switch (param) {
 561         case PIN_CONFIG_BIAS_PULL_DOWN:
 562                 ret = regmap_read(pctl->regmap,
 563                                   pctl->data->reg_pulldn,
 564                                   &data);
 565                 data &= BIT(pin);
 566
 567                 if (ret < 0)
 568                         return ret;
 569
 570                 if (!ret)
 571                         return -EINVAL;
 572
 573                 arg = 1;
 574                 break;
 575
 576         case PIN_CONFIG_BIAS_PULL_UP:
 577                 ret = regmap_read(pctl->regmap,
 578                                   pctl->data->reg_pullup,
 579                                   &data);
 580                 data &= BIT(pin);
 581
 582                 if (ret < 0)
 583                         return ret;
 584
 585                 if (!ret)
 586                         return -EINVAL;
 587
 588                 arg = 1;
 589                 break;
 590
 591         case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 592                 if (pctl->data->model != SX150X_789)
 593                         return -ENOTSUPP;
 594
 595                 ret = regmap_read(pctl->regmap,
 596                                   pctl->data->pri.x789.reg_drain,
 597                                   &data);
 598                 data &= BIT(pin);
 599
 600                 if (ret < 0)
 601                         return ret;
 602
 603                 if (!data)
 604                         return -EINVAL;
 605
 606                 arg = 1;
 607                 break;
 608
 609         case PIN_CONFIG_DRIVE_PUSH_PULL:
 610                 if (pctl->data->model != SX150X_789)
 611                         arg = true;
 612                 else {
 613                         ret = regmap_read(pctl->regmap,
 614                                           pctl->data->pri.x789.reg_drain,
 615                                           &data);
 616                         data &= BIT(pin);
 617
 618                         if (ret < 0)
 619                                 return ret;
 620
 621                         if (data)
 622                                 return -EINVAL;
 623
 624                         arg = 1;
 625                 }
 626                 break;
 627
 628         case PIN_CONFIG_OUTPUT:
 629                 ret = sx150x_gpio_get_direction(&pctl->gpio, pin);
 630                 if (ret < 0)
 631                         return ret;
 632
 633                 if (ret)
 634                         return -EINVAL;
 635
 636                 ret = sx150x_gpio_get(&pctl->gpio, pin);
 637                 if (ret < 0)
 638                         return ret;
 639
 640                 arg = ret;
 641                 break;
 642
 643         default:
 644                 return -ENOTSUPP;
 645         }
 646
 647 out:
 648         *config = pinconf_to_config_packed(param, arg);
 649
 650         return 0;
 651 }
 652
 653 static int sx150x_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
 654                               unsigned long *configs, unsigned int num_configs)
 655 {
 656         struct sx150x_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 657         enum pin_config_param param;
 658         u32 arg;
 659         int i;
 660         int ret;
 661
 662         for (i = 0; i < num_configs; i++) {
 663                 param = pinconf_to_config_param(configs[i]);
 664                 arg = pinconf_to_config_argument(configs[i]);
 665
 666                 if (sx150x_pin_is_oscio(pctl, pin)) {
 667                         if (param == PIN_CONFIG_OUTPUT) {
 668                                 ret = sx150x_gpio_direction_output(&pctl->gpio,
 669                                                                    pin, arg);
 670                                 if (ret < 0)
 671                                         return ret;
 672
 673                                 continue;
 674                         } else
 675                                 return -ENOTSUPP;
 676                 }
 677
 678                 switch (param) {
 679                 case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
 680                 case PIN_CONFIG_BIAS_DISABLE:
 681                         ret = regmap_write_bits(pctl->regmap,
 682                                                 pctl->data->reg_pulldn,
 683                                                 BIT(pin), 0);
 684                         if (ret < 0)
 685                                 return ret;
 686
 687                         ret = regmap_write_bits(pctl->regmap,
 688                                                 pctl->data->reg_pullup,
 689                                                 BIT(pin), 0);
 690                         if (ret < 0)
 691                                 return ret;
 692
 693                         break;
 694
 695                 case PIN_CONFIG_BIAS_PULL_UP:
 696                         ret = regmap_write_bits(pctl->regmap,
 697                                                 pctl->data->reg_pullup,
 698                                                 BIT(pin), BIT(pin));
 699                         if (ret < 0)
 700                                 return ret;
 701
 702                         break;
 703
 704                 case PIN_CONFIG_BIAS_PULL_DOWN:
 705                         ret = regmap_write_bits(pctl->regmap,
 706                                                 pctl->data->reg_pulldn,
 707                                                 BIT(pin), BIT(pin));
 708                         if (ret < 0)
 709                                 return ret;
 710
 711                         break;
 712
 713                 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 714                         ret = sx150x_gpio_set_single_ended(&pctl->gpio,
 715                                                 pin, LINE_MODE_OPEN_DRAIN);
 716                         if (ret < 0)
 717                                 return ret;
 718
 719                         break;
 720
 721                 case PIN_CONFIG_DRIVE_PUSH_PULL:
 722                         ret = sx150x_gpio_set_single_ended(&pctl->gpio,
 723                                                 pin, LINE_MODE_PUSH_PULL);
 724                         if (ret < 0)
 725                                 return ret;
 726
 727                         break;
 728
 729                 case PIN_CONFIG_OUTPUT:
 730                         ret = sx150x_gpio_direction_output(&pctl->gpio,
 731                                                            pin, arg);
 732                         if (ret < 0)
 733                                 return ret;
 734
 735                         break;
 736
 737                 default:
 738                         return -ENOTSUPP;
 739                 }
 740         } /* for each config */
 741
 742         return 0;
 743 }
 744
 745 static const struct pinconf_ops sx150x_pinconf_ops = {
 746         .pin_config_get = sx150x_pinconf_get,
 747         .pin_config_set = sx150x_pinconf_set,
 748         .is_generic = true,
 749 };
 750
 751 static const struct i2c_device_id sx150x_id[] = {
 752         {"sx1508q", (kernel_ulong_t) &sx1508q_device_data },
 753         {"sx1509q", (kernel_ulong_t) &sx1509q_device_data },
 754         {"sx1506q", (kernel_ulong_t) &sx1506q_device_data },
 755         {"sx1502q", (kernel_ulong_t) &sx1502q_device_data },
 756         {"sx1503q", (kernel_ulong_t) &sx1503q_device_data },
 757         {}
 758 };
 759
 760 static const struct of_device_id sx150x_of_match[] = {
 761         { .compatible = "semtech,sx1508q", .data = &sx1508q_device_data },
 762         { .compatible = "semtech,sx1509q", .data = &sx1509q_device_data },
 763         { .compatible = "semtech,sx1506q", .data = &sx1506q_device_data },
 764         { .compatible = "semtech,sx1502q", .data = &sx1502q_device_data },
 765         { .compatible = "semtech,sx1503q", .data = &sx1503q_device_data },
 766         {},
 767 };
 768
 769 static int sx150x_reset(struct sx150x_pinctrl *pctl)
 770 {
 771         int err;
 772
 773         err = i2c_smbus_write_byte_data(pctl->client,
 774                                         pctl->data->pri.x789.reg_reset,
 775                                         SX150X_789_RESET_KEY1);
 776         if (err < 0)
 777                 return err;
 778
 779         err = i2c_smbus_write_byte_data(pctl->client,
 780                                         pctl->data->pri.x789.reg_reset,
 781                                         SX150X_789_RESET_KEY2);
 782         return err;
 783 }
 784
 785 static int sx150x_init_misc(struct sx150x_pinctrl *pctl)
 786 {
 787         u8 reg, value;
 788
 789         switch (pctl->data->model) {
 790         case SX150X_789:
 791                 reg   = pctl->data->pri.x789.reg_misc;
 792                 value = SX150X_789_REG_MISC_AUTOCLEAR_OFF;
 793                 break;
 794         case SX150X_456:
 795                 reg   = pctl->data->pri.x456.reg_advance;
 796                 value = 0x00;
 797
 798                 /*
 799                  * Only SX1506 has RegAdvanced, SX1504/5 are expected
 800                  * to initialize this offset to zero
 801                  */
 802                 if (!reg)
 803                         return 0;
 804                 break;
 805         case SX150X_123:
 806                 reg   = pctl->data->pri.x123.reg_advance;
 807                 value = 0x00;
 808                 break;
 809         default:
 810                 WARN(1, "Unknown chip model %d\n", pctl->data->model);
 811                 return -EINVAL;
 812         }
 813
 814         return regmap_write(pctl->regmap, reg, value);
 815 }
 816
 817 static int sx150x_init_hw(struct sx150x_pinctrl *pctl)
 818 {
 819         const u8 reg[] = {
 820                 [SX150X_789] = pctl->data->pri.x789.reg_polarity,
 821                 [SX150X_456] = pctl->data->pri.x456.reg_pld_mode,
 822                 [SX150X_123] = pctl->data->pri.x123.reg_pld_mode,
 823         };
 824         int err;
 825
 826         if (pctl->data->model == SX150X_789 &&
 827             of_property_read_bool(pctl->dev->of_node, "semtech,probe-reset")) {
 828                 err = sx150x_reset(pctl);
 829                 if (err < 0)
 830                         return err;
 831         }
 832
 833         err = sx150x_init_misc(pctl);
 834         if (err < 0)
 835                 return err;
 836
 837         /* Set all pins to work in normal mode */
 838         return regmap_write(pctl->regmap, reg[pctl->data->model], 0);
 839 }
 840
 841 static int sx150x_regmap_reg_width(struct sx150x_pinctrl *pctl,
 842                                    unsigned int reg)
 843 {
 844         const struct sx150x_device_data *data = pctl->data;
 845
 846         if (reg == data->reg_sense) {
 847                 /*
 848                  * RegSense packs two bits of configuration per GPIO,
 849                  * so we'd need to read twice as many bits as there
 850                  * are GPIO in our chip
 851                  */
 852                 return 2 * data->ngpios;
 853         } else if ((data->model == SX150X_789 &&
 854                     (reg == data->pri.x789.reg_misc ||
 855                      reg == data->pri.x789.reg_clock ||
 856                      reg == data->pri.x789.reg_reset))
 857                    ||
 858                    (data->model == SX150X_123 &&
 859                     reg == data->pri.x123.reg_advance)
 860                    ||
 861                    (data->model == SX150X_456 &&
 862                     reg == data->pri.x456.reg_advance)) {
 863                 return 8;
 864         } else {
 865                 return data->ngpios;
 866         }
 867 }
 868
 869 static unsigned int sx150x_maybe_swizzle(struct sx150x_pinctrl *pctl,
 870                                          unsigned int reg, unsigned int val)
 871 {
 872         unsigned int a, b;
 873         const struct sx150x_device_data *data = pctl->data;
 874
 875         /*
 876          * Whereas SX1509 presents RegSense in a simple layout as such:
 877          *      reg     [ f f e e d d c c ]
 878          *      reg + 1 [ b b a a 9 9 8 8 ]
 879          *      reg + 2 [ 7 7 6 6 5 5 4 4 ]
 880          *      reg + 3 [ 3 3 2 2 1 1 0 0 ]
 881          *
 882          * SX1503 and SX1506 deviate from that data layout, instead storing
 883          * their contents as follows:
 884          *
 885          *      reg     [ f f e e d d c c ]
 886          *      reg + 1 [ 7 7 6 6 5 5 4 4 ]
 887          *      reg + 2 [ b b a a 9 9 8 8 ]
 888          *      reg + 3 [ 3 3 2 2 1 1 0 0 ]
 889          *
 890          * so, taking that into account, we swap two
 891          * inner bytes of a 4-byte result
 892          */
 893
 894         if (reg == data->reg_sense &&
 895             data->ngpios == 16 &&
 896             (data->model == SX150X_123 ||
 897              data->model == SX150X_456)) {
 898                 a = val & 0x00ff0000;
 899                 b = val & 0x0000ff00;
 900
 901                 val &= 0xff0000ff;
 902                 val |= b << 8;
 903                 val |= a >> 8;
 904         }
 905
 906         return val;
 907 }
 908
 909 /*
 910  * In order to mask the differences between 16 and 8 bit expander
 911  * devices we set up a sligthly ficticious regmap that pretends to be
 912  * a set of 32-bit (to accomodate RegSenseLow/RegSenseHigh
 913  * pair/quartet) registers and transparently reconstructs those
 914  * registers via multiple I2C/SMBus reads
 915  *
 916  * This way the rest of the driver code, interfacing with the chip via
 917  * regmap API, can work assuming that each GPIO pin is represented by
 918  * a group of bits at an offset proportional to GPIO number within a
 919  * given register.
 920  */
 921 static int sx150x_regmap_reg_read(void *context, unsigned int reg,
 922                                   unsigned int *result)
 923 {
 924         int ret, n;
 925         struct sx150x_pinctrl *pctl = context;
 926         struct i2c_client *i2c = pctl->client;
 927         const int width = sx150x_regmap_reg_width(pctl, reg);
 928         unsigned int idx, val;
 929
 930         /*
 931          * There are four potential cases covered by this function:
 932          *
 933          * 1) 8-pin chip, single configuration bit register
 934          *
 935          *      This is trivial the code below just needs to read:
 936          *              reg  [ 7 6 5 4 3 2 1 0 ]
 937          *
 938          * 2) 8-pin chip, double configuration bit register (RegSense)
 939          *
 940          *      The read will be done as follows:
 941          *              reg      [ 7 7 6 6 5 5 4 4 ]
 942          *              reg + 1  [ 3 3 2 2 1 1 0 0 ]
 943          *
 944          * 3) 16-pin chip, single configuration bit register
 945          *
 946          *      The read will be done as follows:
 947          *              reg     [ f e d c b a 9 8 ]
 948          *              reg + 1 [ 7 6 5 4 3 2 1 0 ]
 949          *
 950          * 4) 16-pin chip, double configuration bit register (RegSense)
 951          *
 952          *      The read will be done as follows:
 953          *              reg     [ f f e e d d c c ]
 954          *              reg + 1 [ b b a a 9 9 8 8 ]
 955          *              reg + 2 [ 7 7 6 6 5 5 4 4 ]
 956          *              reg + 3 [ 3 3 2 2 1 1 0 0 ]
 957          */
 958
 959         for (n = width, val = 0, idx = reg; n > 0; n -= 8, idx++) {
 960                 val <<= 8;
 961
 962                 ret = i2c_smbus_read_byte_data(i2c, idx);
 963                 if (ret < 0)
 964                         return ret;
 965
 966                 val |= ret;
 967         }
 968
 969         *result = sx150x_maybe_swizzle(pctl, reg, val);
 970
 971         return 0;
 972 }
 973
 974 static int sx150x_regmap_reg_write(void *context, unsigned int reg,
 975                                    unsigned int val)
 976 {
 977         int ret, n;
 978         struct sx150x_pinctrl *pctl = context;
 979         struct i2c_client *i2c = pctl->client;
 980         const int width = sx150x_regmap_reg_width(pctl, reg);
 981
 982         val = sx150x_maybe_swizzle(pctl, reg, val);
 983
 984         n = width - 8;
 985         do {
 986                 const u8 byte = (val >> n) & 0xff;
 987
 988                 ret = i2c_smbus_write_byte_data(i2c, reg, byte);
 989                 if (ret < 0)
 990                         return ret;
 991
 992                 reg++;
 993                 n -= 8;
 994         } while (n >= 0);
 995
 996         return 0;
 997 }
 998
 999 static bool sx150x_reg_volatile(struct device *dev, unsigned int reg)
1000 {
1001         struct sx150x_pinctrl *pctl = i2c_get_clientdata(to_i2c_client(dev));
1002
1003         return reg == pctl->data->reg_irq_src || reg == pctl->data->reg_data;
1004 }
1005
1006 const struct regmap_config sx150x_regmap_config = {
1007         .reg_bits = 8,
1008         .val_bits = 32,
1009
1010         .cache_type = REGCACHE_RBTREE,
1011
1012         .reg_read = sx150x_regmap_reg_read,
1013         .reg_write = sx150x_regmap_reg_write,
1014
1015         .max_register = SX150X_MAX_REGISTER,
1016         .volatile_reg = sx150x_reg_volatile,
1017 };
1018
1019 static int sx150x_probe(struct i2c_client *client,
1020                         const struct i2c_device_id *id)
1021 {
1022         static const u32 i2c_funcs = I2C_FUNC_SMBUS_BYTE_DATA |
1023                                      I2C_FUNC_SMBUS_WRITE_WORD_DATA;
1024         struct device *dev = &client->dev;
1025         struct sx150x_pinctrl *pctl;
1026         int ret;
1027
1028         if (!i2c_check_functionality(client->adapter, i2c_funcs))
1029                 return -ENOSYS;
1030
1031         pctl = devm_kzalloc(dev, sizeof(*pctl), GFP_KERNEL);
1032         if (!pctl)
1033                 return -ENOMEM;
1034
1035         i2c_set_clientdata(client, pctl);
1036
1037         pctl->dev = dev;
1038         pctl->client = client;
1039
1040         if (dev->of_node)
1041                 pctl->data = of_device_get_match_data(dev);
1042         else
1043                 pctl->data = (struct sx150x_device_data *)id->driver_data;
1044
1045         if (!pctl->data)
1046                 return -EINVAL;
1047
1048         pctl->regmap = devm_regmap_init(dev, NULL, pctl,
1049                                         &sx150x_regmap_config);
1050         if (IS_ERR(pctl->regmap)) {
1051                 ret = PTR_ERR(pctl->regmap);
1052                 dev_err(dev, "Failed to allocate register map: %d\n",
1053                         ret);
1054                 return ret;
1055         }
1056
1057         mutex_init(&pctl->lock);
1058
1059         ret = sx150x_init_hw(pctl);
1060         if (ret)
1061                 return ret;
1062
1063         /* Register GPIO controller */
1064         pctl->gpio.label = devm_kstrdup(dev, client->name, GFP_KERNEL);
1065         pctl->gpio.base = -1;
1066         pctl->gpio.ngpio = pctl->data->npins;
1067         pctl->gpio.get_direction = sx150x_gpio_get_direction;
1068         pctl->gpio.direction_input = sx150x_gpio_direction_input;
1069         pctl->gpio.direction_output = sx150x_gpio_direction_output;
1070         pctl->gpio.get = sx150x_gpio_get;
1071         pctl->gpio.set = sx150x_gpio_set;
1072         pctl->gpio.set_single_ended = sx150x_gpio_set_single_ended;
1073         pctl->gpio.parent = dev;
1074 #ifdef CONFIG_OF_GPIO
1075         pctl->gpio.of_node = dev->of_node;
1076 #endif
1077         pctl->gpio.can_sleep = true;
1078
1079         ret = devm_gpiochip_add_data(dev, &pctl->gpio, pctl);
1080         if (ret)
1081                 return ret;
1082
1083         /* Add Interrupt support if an irq is specified */
1084         if (client->irq > 0) {
1085                 pctl->irq_chip.name = devm_kstrdup(dev, client->name,
1086                                                    GFP_KERNEL);
1087                 pctl->irq_chip.irq_mask = sx150x_irq_mask;
1088                 pctl->irq_chip.irq_unmask = sx150x_irq_unmask;
1089                 pctl->irq_chip.irq_set_type = sx150x_irq_set_type;
1090                 pctl->irq_chip.irq_bus_lock = sx150x_irq_bus_lock;
1091                 pctl->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock;
1092
1093                 pctl->irq.masked = ~0;
1094                 pctl->irq.sense = 0;
1095
1096                 /*
1097                  * Because sx150x_irq_threaded_fn invokes all of the
1098                  * nested interrrupt handlers via handle_nested_irq,
1099                  * any "handler" passed to gpiochip_irqchip_add()
1100                  * below is going to be ignored, so the choice of the
1101                  * function does not matter that much.
1102                  *
1103                  * We set it to handle_bad_irq to avoid confusion,
1104                  * plus it will be instantly noticeable if it is ever
1105                  * called (should not happen)
1106                  */
1107                 ret = gpiochip_irqchip_add(&pctl->gpio,
1108                                            &pctl->irq_chip, 0,
1109                                            handle_bad_irq, IRQ_TYPE_NONE);
1110                 if (ret) {
1111                         dev_err(dev, "could not connect irqchip to gpiochip\n");
1112                         return ret;
1113                 }
1114
1115                 ret = devm_request_threaded_irq(dev, client->irq, NULL,
1116                                                 sx150x_irq_thread_fn,
1117                                                 IRQF_ONESHOT | IRQF_SHARED |
1118                                                 IRQF_TRIGGER_FALLING,
1119                                                 pctl->irq_chip.name, pctl);
1120                 if (ret < 0)
1121                         return ret;
1122         }
1123
1124         /* Pinctrl_desc */
1125         pctl->pinctrl_desc.name = "sx150x-pinctrl";
1126         pctl->pinctrl_desc.pctlops = &sx150x_pinctrl_ops;
1127         pctl->pinctrl_desc.confops = &sx150x_pinconf_ops;
1128         pctl->pinctrl_desc.pins = pctl->data->pins;
1129         pctl->pinctrl_desc.npins = pctl->data->npins;
1130         pctl->pinctrl_desc.owner = THIS_MODULE;
1131
1132         pctl->pctldev = pinctrl_register(&pctl->pinctrl_desc, dev, pctl);
1133         if (IS_ERR(pctl->pctldev)) {
1134                 dev_err(dev, "Failed to register pinctrl device\n");
1135                 return PTR_ERR(pctl->pctldev);
1136         }
1137
1138         return 0;
1139 }
1140
1141 static struct i2c_driver sx150x_driver = {
1142         .driver = {
1143                 .name = "sx150x-pinctrl",
1144                 .of_match_table = of_match_ptr(sx150x_of_match),
1145         },
1146         .probe    = sx150x_probe,
1147         .id_table = sx150x_id,
1148 };
1149
1150 static int __init sx150x_init(void)
1151 {
1152         return i2c_add_driver(&sx150x_driver);
1153 }
1154 subsys_initcall(sx150x_init);