drivers/pinctrl/pinctrl-sx150x.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2016, BayLibre, SAS. All rights reserved.
   4  * Author: Neil Armstrong <narmstrong@baylibre.com>
   5  *
   6  * Copyright (c) 2010, Code Aurora Forum. All rights reserved.
   7  *
   8  * Driver for Semtech SX150X I2C GPIO Expanders
   9  * The handling of the 4-bit chips (SX1501/SX1504/SX1507) is untested.
  10  *
  11  * Author: Gregory Bean <gbean@codeaurora.org>
  12  */
  13
  14 #include <linux/regmap.h>
  15 #include <linux/i2c.h>
  16 #include <linux/init.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/irq.h>
  19 #include <linux/mutex.h>
  20 #include <linux/slab.h>
  21 #include <linux/of.h>
  22 #include <linux/of_device.h>
  23 #include <linux/gpio/driver.h>
  24 #include <linux/pinctrl/pinconf.h>
  25 #include <linux/pinctrl/pinctrl.h>
  26 #include <linux/pinctrl/pinmux.h>
  27 #include <linux/pinctrl/pinconf-generic.h>
  28
  29 #include "core.h"
  30 #include "pinconf.h"
  31 #include "pinctrl-utils.h"
  32
  33 /* The chip models of sx150x */
  34 enum {
  35         SX150X_123 = 0,
  36         SX150X_456,
  37         SX150X_789,
  38 };
  39 enum {
  40         SX150X_789_REG_MISC_AUTOCLEAR_OFF = 1 << 0,
  41         SX150X_MAX_REGISTER = 0xad,
  42         SX150X_IRQ_TYPE_EDGE_RISING = 0x1,
  43         SX150X_IRQ_TYPE_EDGE_FALLING = 0x2,
  44         SX150X_789_RESET_KEY1 = 0x12,
  45         SX150X_789_RESET_KEY2 = 0x34,
  46 };
  47
  48 struct sx150x_123_pri {
  49         u8 reg_pld_mode;
  50         u8 reg_pld_table0;
  51         u8 reg_pld_table1;
  52         u8 reg_pld_table2;
  53         u8 reg_pld_table3;
  54         u8 reg_pld_table4;
  55         u8 reg_advanced;
  56 };
  57
  58 struct sx150x_456_pri {
  59         u8 reg_pld_mode;
  60         u8 reg_pld_table0;
  61         u8 reg_pld_table1;
  62         u8 reg_pld_table2;
  63         u8 reg_pld_table3;
  64         u8 reg_pld_table4;
  65         u8 reg_advanced;
  66 };
  67
  68 struct sx150x_789_pri {
  69         u8 reg_drain;
  70         u8 reg_polarity;
  71         u8 reg_clock;
  72         u8 reg_misc;
  73         u8 reg_reset;
  74         u8 ngpios;
  75 };
  76
  77 struct sx150x_device_data {
  78         u8 model;
  79         u8 reg_pullup;
  80         u8 reg_pulldn;
  81         u8 reg_dir;
  82         u8 reg_data;
  83         u8 reg_irq_mask;
  84         u8 reg_irq_src;
  85         u8 reg_sense;
  86         u8 ngpios;
  87         union {
  88                 struct sx150x_123_pri x123;
  89                 struct sx150x_456_pri x456;
  90                 struct sx150x_789_pri x789;
  91         } pri;
  92         const struct pinctrl_pin_desc *pins;
  93         unsigned int npins;
  94 };
  95
  96 struct sx150x_pinctrl {
  97         struct device *dev;
  98         struct i2c_client *client;
  99         struct pinctrl_dev *pctldev;
 100         struct pinctrl_desc pinctrl_desc;
 101         struct gpio_chip gpio;
 102         struct irq_chip irq_chip;
 103         struct regmap *regmap;
 104         struct {
 105                 u32 sense;
 106                 u32 masked;
 107         } irq;
 108         struct mutex lock;
 109         const struct sx150x_device_data *data;
 110 };
 111
 112 static const struct pinctrl_pin_desc sx150x_4_pins[] = {
 113         PINCTRL_PIN(0, "gpio0"),
 114         PINCTRL_PIN(1, "gpio1"),
 115         PINCTRL_PIN(2, "gpio2"),
 116         PINCTRL_PIN(3, "gpio3"),
 117         PINCTRL_PIN(4, "oscio"),
 118 };
 119
 120 static const struct pinctrl_pin_desc sx150x_8_pins[] = {
 121         PINCTRL_PIN(0, "gpio0"),
 122         PINCTRL_PIN(1, "gpio1"),
 123         PINCTRL_PIN(2, "gpio2"),
 124         PINCTRL_PIN(3, "gpio3"),
 125         PINCTRL_PIN(4, "gpio4"),
 126         PINCTRL_PIN(5, "gpio5"),
 127         PINCTRL_PIN(6, "gpio6"),
 128         PINCTRL_PIN(7, "gpio7"),
 129         PINCTRL_PIN(8, "oscio"),
 130 };
 131
 132 static const struct pinctrl_pin_desc sx150x_16_pins[] = {
 133         PINCTRL_PIN(0, "gpio0"),
 134         PINCTRL_PIN(1, "gpio1"),
 135         PINCTRL_PIN(2, "gpio2"),
 136         PINCTRL_PIN(3, "gpio3"),
 137         PINCTRL_PIN(4, "gpio4"),
 138         PINCTRL_PIN(5, "gpio5"),
 139         PINCTRL_PIN(6, "gpio6"),
 140         PINCTRL_PIN(7, "gpio7"),
 141         PINCTRL_PIN(8, "gpio8"),
 142         PINCTRL_PIN(9, "gpio9"),
 143         PINCTRL_PIN(10, "gpio10"),
 144         PINCTRL_PIN(11, "gpio11"),
 145         PINCTRL_PIN(12, "gpio12"),
 146         PINCTRL_PIN(13, "gpio13"),
 147         PINCTRL_PIN(14, "gpio14"),
 148         PINCTRL_PIN(15, "gpio15"),
 149         PINCTRL_PIN(16, "oscio"),
 150 };
 151
 152 static const struct sx150x_device_data sx1501q_device_data = {
 153         .model = SX150X_123,
 154         .reg_pullup     = 0x02,
 155         .reg_pulldn     = 0x03,
 156         .reg_dir        = 0x01,
 157         .reg_data       = 0x00,
 158         .reg_irq_mask   = 0x05,
 159         .reg_irq_src    = 0x08,
 160         .reg_sense      = 0x07,
 161         .pri.x123 = {
 162                 .reg_pld_mode   = 0x10,
 163                 .reg_pld_table0 = 0x11,
 164                 .reg_pld_table2 = 0x13,
 165                 .reg_advanced   = 0xad,
 166         },
 167         .ngpios = 4,
 168         .pins = sx150x_4_pins,
 169         .npins = 4, /* oscio not available */
 170 };
 171
 172 static const struct sx150x_device_data sx1502q_device_data = {
 173         .model = SX150X_123,
 174         .reg_pullup     = 0x02,
 175         .reg_pulldn     = 0x03,
 176         .reg_dir        = 0x01,
 177         .reg_data       = 0x00,
 178         .reg_irq_mask   = 0x05,
 179         .reg_irq_src    = 0x08,
 180         .reg_sense      = 0x06,
 181         .pri.x123 = {
 182                 .reg_pld_mode   = 0x10,
 183                 .reg_pld_table0 = 0x11,
 184                 .reg_pld_table1 = 0x12,
 185                 .reg_pld_table2 = 0x13,
 186                 .reg_pld_table3 = 0x14,
 187                 .reg_pld_table4 = 0x15,
 188                 .reg_advanced   = 0xad,
 189         },
 190         .ngpios = 8,
 191         .pins = sx150x_8_pins,
 192         .npins = 8, /* oscio not available */
 193 };
 194
 195 static const struct sx150x_device_data sx1503q_device_data = {
 196         .model = SX150X_123,
 197         .reg_pullup     = 0x04,
 198         .reg_pulldn     = 0x06,
 199         .reg_dir        = 0x02,
 200         .reg_data       = 0x00,
 201         .reg_irq_mask   = 0x08,
 202         .reg_irq_src    = 0x0e,
 203         .reg_sense      = 0x0a,
 204         .pri.x123 = {
 205                 .reg_pld_mode   = 0x20,
 206                 .reg_pld_table0 = 0x22,
 207                 .reg_pld_table1 = 0x24,
 208                 .reg_pld_table2 = 0x26,
 209                 .reg_pld_table3 = 0x28,
 210                 .reg_pld_table4 = 0x2a,
 211                 .reg_advanced   = 0xad,
 212         },
 213         .ngpios = 16,
 214         .pins = sx150x_16_pins,
 215         .npins  = 16, /* oscio not available */
 216 };
 217
 218 static const struct sx150x_device_data sx1504q_device_data = {
 219         .model = SX150X_456,
 220         .reg_pullup     = 0x02,
 221         .reg_pulldn     = 0x03,
 222         .reg_dir        = 0x01,
 223         .reg_data       = 0x00,
 224         .reg_irq_mask   = 0x05,
 225         .reg_irq_src    = 0x08,
 226         .reg_sense      = 0x07,
 227         .pri.x456 = {
 228                 .reg_pld_mode   = 0x10,
 229                 .reg_pld_table0 = 0x11,
 230                 .reg_pld_table2 = 0x13,
 231         },
 232         .ngpios = 4,
 233         .pins = sx150x_4_pins,
 234         .npins = 4, /* oscio not available */
 235 };
 236
 237 static const struct sx150x_device_data sx1505q_device_data = {
 238         .model = SX150X_456,
 239         .reg_pullup     = 0x02,
 240         .reg_pulldn     = 0x03,
 241         .reg_dir        = 0x01,
 242         .reg_data       = 0x00,
 243         .reg_irq_mask   = 0x05,
 244         .reg_irq_src    = 0x08,
 245         .reg_sense      = 0x06,
 246         .pri.x456 = {
 247                 .reg_pld_mode   = 0x10,
 248                 .reg_pld_table0 = 0x11,
 249                 .reg_pld_table1 = 0x12,
 250                 .reg_pld_table2 = 0x13,
 251                 .reg_pld_table3 = 0x14,
 252                 .reg_pld_table4 = 0x15,
 253         },
 254         .ngpios = 8,
 255         .pins = sx150x_8_pins,
 256         .npins = 8, /* oscio not available */
 257 };
 258
 259 static const struct sx150x_device_data sx1506q_device_data = {
 260         .model = SX150X_456,
 261         .reg_pullup     = 0x04,
 262         .reg_pulldn     = 0x06,
 263         .reg_dir        = 0x02,
 264         .reg_data       = 0x00,
 265         .reg_irq_mask   = 0x08,
 266         .reg_irq_src    = 0x0e,
 267         .reg_sense      = 0x0a,
 268         .pri.x456 = {
 269                 .reg_pld_mode   = 0x20,
 270                 .reg_pld_table0 = 0x22,
 271                 .reg_pld_table1 = 0x24,
 272                 .reg_pld_table2 = 0x26,
 273                 .reg_pld_table3 = 0x28,
 274                 .reg_pld_table4 = 0x2a,
 275                 .reg_advanced   = 0xad,
 276         },
 277         .ngpios = 16,
 278         .pins = sx150x_16_pins,
 279         .npins = 16, /* oscio not available */
 280 };
 281
 282 static const struct sx150x_device_data sx1507q_device_data = {
 283         .model = SX150X_789,
 284         .reg_pullup     = 0x03,
 285         .reg_pulldn     = 0x04,
 286         .reg_dir        = 0x07,
 287         .reg_data       = 0x08,
 288         .reg_irq_mask   = 0x09,
 289         .reg_irq_src    = 0x0b,
 290         .reg_sense      = 0x0a,
 291         .pri.x789 = {
 292                 .reg_drain      = 0x05,
 293                 .reg_polarity   = 0x06,
 294                 .reg_clock      = 0x0d,
 295                 .reg_misc       = 0x0e,
 296                 .reg_reset      = 0x7d,
 297         },
 298         .ngpios = 4,
 299         .pins = sx150x_4_pins,
 300         .npins = ARRAY_SIZE(sx150x_4_pins),
 301 };
 302
 303 static const struct sx150x_device_data sx1508q_device_data = {
 304         .model = SX150X_789,
 305         .reg_pullup     = 0x03,
 306         .reg_pulldn     = 0x04,
 307         .reg_dir        = 0x07,
 308         .reg_data       = 0x08,
 309         .reg_irq_mask   = 0x09,
 310         .reg_irq_src    = 0x0c,
 311         .reg_sense      = 0x0a,
 312         .pri.x789 = {
 313                 .reg_drain      = 0x05,
 314                 .reg_polarity   = 0x06,
 315                 .reg_clock      = 0x0f,
 316                 .reg_misc       = 0x10,
 317                 .reg_reset      = 0x7d,
 318         },
 319         .ngpios = 8,
 320         .pins = sx150x_8_pins,
 321         .npins = ARRAY_SIZE(sx150x_8_pins),
 322 };
 323
 324 static const struct sx150x_device_data sx1509q_device_data = {
 325         .model = SX150X_789,
 326         .reg_pullup     = 0x06,
 327         .reg_pulldn     = 0x08,
 328         .reg_dir        = 0x0e,
 329         .reg_data       = 0x10,
 330         .reg_irq_mask   = 0x12,
 331         .reg_irq_src    = 0x18,
 332         .reg_sense      = 0x14,
 333         .pri.x789 = {
 334                 .reg_drain      = 0x0a,
 335                 .reg_polarity   = 0x0c,
 336                 .reg_clock      = 0x1e,
 337                 .reg_misc       = 0x1f,
 338                 .reg_reset      = 0x7d,
 339         },
 340         .ngpios = 16,
 341         .pins = sx150x_16_pins,
 342         .npins = ARRAY_SIZE(sx150x_16_pins),
 343 };
 344
 345 static int sx150x_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
 346 {
 347         return 0;
 348 }
 349
 350 static const char *sx150x_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
 351                                                 unsigned int group)
 352 {
 353         return NULL;
 354 }
 355
 356 static int sx150x_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
 357                                         unsigned int group,
 358                                         const unsigned int **pins,
 359                                         unsigned int *num_pins)
 360 {
 361         return -ENOTSUPP;
 362 }
 363
 364 static const struct pinctrl_ops sx150x_pinctrl_ops = {
 365         .get_groups_count = sx150x_pinctrl_get_groups_count,
 366         .get_group_name = sx150x_pinctrl_get_group_name,
 367         .get_group_pins = sx150x_pinctrl_get_group_pins,
 368 #ifdef CONFIG_OF
 369         .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
 370         .dt_free_map = pinctrl_utils_free_map,
 371 #endif
 372 };
 373
 374 static bool sx150x_pin_is_oscio(struct sx150x_pinctrl *pctl, unsigned int pin)
 375 {
 376         if (pin >= pctl->data->npins)
 377                 return false;
 378
 379         /* OSCIO pin is only present in 789 devices */
 380         if (pctl->data->model != SX150X_789)
 381                 return false;
 382
 383         return !strcmp(pctl->data->pins[pin].name, "oscio");
 384 }
 385
 386 static int sx150x_gpio_get_direction(struct gpio_chip *chip,
 387                                       unsigned int offset)
 388 {
 389         struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
 390         unsigned int value;
 391         int ret;
 392
 393         if (sx150x_pin_is_oscio(pctl, offset))
 394                 return false;
 395
 396         ret = regmap_read(pctl->regmap, pctl->data->reg_dir, &value);
 397         if (ret < 0)
 398                 return ret;
 399
 400         return !!(value & BIT(offset));
 401 }
 402
 403 static int sx150x_gpio_get(struct gpio_chip *chip, unsigned int offset)
 404 {
 405         struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
 406         unsigned int value;
 407         int ret;
 408
 409         if (sx150x_pin_is_oscio(pctl, offset))
 410                 return -EINVAL;
 411
 412         ret = regmap_read(pctl->regmap, pctl->data->reg_data, &value);
 413         if (ret < 0)
 414                 return ret;
 415
 416         return !!(value & BIT(offset));
 417 }
 418
 419 static int __sx150x_gpio_set(struct sx150x_pinctrl *pctl, unsigned int offset,
 420                              int value)
 421 {
 422         return regmap_write_bits(pctl->regmap, pctl->data->reg_data,
 423                                  BIT(offset), value ? BIT(offset) : 0);
 424 }
 425
 426 static int sx150x_gpio_oscio_set(struct sx150x_pinctrl *pctl,
 427                                  int value)
 428 {
 429         return regmap_write(pctl->regmap,
 430                             pctl->data->pri.x789.reg_clock,
 431                             (value ? 0x1f : 0x10));
 432 }
 433
 434 static void sx150x_gpio_set(struct gpio_chip *chip, unsigned int offset,
 435                             int value)
 436 {
 437         struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
 438
 439         if (sx150x_pin_is_oscio(pctl, offset))
 440                 sx150x_gpio_oscio_set(pctl, value);
 441         else
 442                 __sx150x_gpio_set(pctl, offset, value);
 443
 444 }
 445
 446 static void sx150x_gpio_set_multiple(struct gpio_chip *chip,
 447                                      unsigned long *mask,
 448                                      unsigned long *bits)
 449 {
 450         struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
 451
 452         regmap_write_bits(pctl->regmap, pctl->data->reg_data, *mask, *bits);
 453 }
 454
 455 static int sx150x_gpio_direction_input(struct gpio_chip *chip,
 456                                        unsigned int offset)
 457 {
 458         struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
 459
 460         if (sx150x_pin_is_oscio(pctl, offset))
 461                 return -EINVAL;
 462
 463         return regmap_write_bits(pctl->regmap,
 464                                  pctl->data->reg_dir,
 465                                  BIT(offset), BIT(offset));
 466 }
 467
 468 static int sx150x_gpio_direction_output(struct gpio_chip *chip,
 469                                         unsigned int offset, int value)
 470 {
 471         struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
 472         int ret;
 473
 474         if (sx150x_pin_is_oscio(pctl, offset))
 475                 return sx150x_gpio_oscio_set(pctl, value);
 476
 477         ret = __sx150x_gpio_set(pctl, offset, value);
 478         if (ret < 0)
 479                 return ret;
 480
 481         return regmap_write_bits(pctl->regmap,
 482                                  pctl->data->reg_dir,
 483                                  BIT(offset), 0);
 484 }
 485
 486 static void sx150x_irq_mask(struct irq_data *d)
 487 {
 488         struct sx150x_pinctrl *pctl =
 489                         gpiochip_get_data(irq_data_get_irq_chip_data(d));
 490         unsigned int n = d->hwirq;
 491
 492         pctl->irq.masked |= BIT(n);
 493 }
 494
 495 static void sx150x_irq_unmask(struct irq_data *d)
 496 {
 497         struct sx150x_pinctrl *pctl =
 498                         gpiochip_get_data(irq_data_get_irq_chip_data(d));
 499         unsigned int n = d->hwirq;
 500
 501         pctl->irq.masked &= ~BIT(n);
 502 }
 503
 504 static void sx150x_irq_set_sense(struct sx150x_pinctrl *pctl,
 505                                  unsigned int line, unsigned int sense)
 506 {
 507         /*
 508          * Every interrupt line is represented by two bits shifted
 509          * proportionally to the line number
 510          */
 511         const unsigned int n = line * 2;
 512         const unsigned int mask = ~((SX150X_IRQ_TYPE_EDGE_RISING |
 513                                      SX150X_IRQ_TYPE_EDGE_FALLING) << n);
 514
 515         pctl->irq.sense &= mask;
 516         pctl->irq.sense |= sense << n;
 517 }
 518
 519 static int sx150x_irq_set_type(struct irq_data *d, unsigned int flow_type)
 520 {
 521         struct sx150x_pinctrl *pctl =
 522                         gpiochip_get_data(irq_data_get_irq_chip_data(d));
 523         unsigned int n, val = 0;
 524
 525         if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
 526                 return -EINVAL;
 527
 528         n = d->hwirq;
 529
 530         if (flow_type & IRQ_TYPE_EDGE_RISING)
 531                 val |= SX150X_IRQ_TYPE_EDGE_RISING;
 532         if (flow_type & IRQ_TYPE_EDGE_FALLING)
 533                 val |= SX150X_IRQ_TYPE_EDGE_FALLING;
 534
 535         sx150x_irq_set_sense(pctl, n, val);
 536         return 0;
 537 }
 538
 539 static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
 540 {
 541         struct sx150x_pinctrl *pctl = (struct sx150x_pinctrl *)dev_id;
 542         unsigned long n, status;
 543         unsigned int val;
 544         int err;
 545
 546         err = regmap_read(pctl->regmap, pctl->data->reg_irq_src, &val);
 547         if (err < 0)
 548                 return IRQ_NONE;
 549
 550         err = regmap_write(pctl->regmap, pctl->data->reg_irq_src, val);
 551         if (err < 0)
 552                 return IRQ_NONE;
 553
 554         status = val;
 555         for_each_set_bit(n, &status, pctl->data->ngpios)
 556                 handle_nested_irq(irq_find_mapping(pctl->gpio.irq.domain, n));
 557
 558         return IRQ_HANDLED;
 559 }
 560
 561 static void sx150x_irq_bus_lock(struct irq_data *d)
 562 {
 563         struct sx150x_pinctrl *pctl =
 564                         gpiochip_get_data(irq_data_get_irq_chip_data(d));
 565
 566         mutex_lock(&pctl->lock);
 567 }
 568
 569 static void sx150x_irq_bus_sync_unlock(struct irq_data *d)
 570 {
 571         struct sx150x_pinctrl *pctl =
 572                         gpiochip_get_data(irq_data_get_irq_chip_data(d));
 573
 574         regmap_write(pctl->regmap, pctl->data->reg_irq_mask, pctl->irq.masked);
 575         regmap_write(pctl->regmap, pctl->data->reg_sense, pctl->irq.sense);
 576         mutex_unlock(&pctl->lock);
 577 }
 578
 579 static int sx150x_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
 580                               unsigned long *config)
 581 {
 582         struct sx150x_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 583         unsigned int param = pinconf_to_config_param(*config);
 584         int ret;
 585         u32 arg;
 586         unsigned int data;
 587
 588         if (sx150x_pin_is_oscio(pctl, pin)) {
 589                 switch (param) {
 590                 case PIN_CONFIG_DRIVE_PUSH_PULL:
 591                 case PIN_CONFIG_OUTPUT:
 592                         ret = regmap_read(pctl->regmap,
 593                                           pctl->data->pri.x789.reg_clock,
 594                                           &data);
 595                         if (ret < 0)
 596                                 return ret;
 597
 598                         if (param == PIN_CONFIG_DRIVE_PUSH_PULL)
 599                                 arg = (data & 0x1f) ? 1 : 0;
 600                         else {
 601                                 if ((data & 0x1f) == 0x1f)
 602                                         arg = 1;
 603                                 else if ((data & 0x1f) == 0x10)
 604                                         arg = 0;
 605                                 else
 606                                         return -EINVAL;
 607                         }
 608
 609                         break;
 610                 default:
 611                         return -ENOTSUPP;
 612                 }
 613
 614                 goto out;
 615         }
 616
 617         switch (param) {
 618         case PIN_CONFIG_BIAS_PULL_DOWN:
 619                 ret = regmap_read(pctl->regmap,
 620                                   pctl->data->reg_pulldn,
 621                                   &data);
 622                 data &= BIT(pin);
 623
 624                 if (ret < 0)
 625                         return ret;
 626
 627                 if (!ret)
 628                         return -EINVAL;
 629
 630                 arg = 1;
 631                 break;
 632
 633         case PIN_CONFIG_BIAS_PULL_UP:
 634                 ret = regmap_read(pctl->regmap,
 635                                   pctl->data->reg_pullup,
 636                                   &data);
 637                 data &= BIT(pin);
 638
 639                 if (ret < 0)
 640                         return ret;
 641
 642                 if (!ret)
 643                         return -EINVAL;
 644
 645                 arg = 1;
 646                 break;
 647
 648         case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 649                 if (pctl->data->model != SX150X_789)
 650                         return -ENOTSUPP;
 651
 652                 ret = regmap_read(pctl->regmap,
 653                                   pctl->data->pri.x789.reg_drain,
 654                                   &data);
 655                 data &= BIT(pin);
 656
 657                 if (ret < 0)
 658                         return ret;
 659
 660                 if (!data)
 661                         return -EINVAL;
 662
 663                 arg = 1;
 664                 break;
 665
 666         case PIN_CONFIG_DRIVE_PUSH_PULL:
 667                 if (pctl->data->model != SX150X_789)
 668                         arg = true;
 669                 else {
 670                         ret = regmap_read(pctl->regmap,
 671                                           pctl->data->pri.x789.reg_drain,
 672                                           &data);
 673                         data &= BIT(pin);
 674
 675                         if (ret < 0)
 676                                 return ret;
 677
 678                         if (data)
 679                                 return -EINVAL;
 680
 681                         arg = 1;
 682                 }
 683                 break;
 684
 685         case PIN_CONFIG_OUTPUT:
 686                 ret = sx150x_gpio_get_direction(&pctl->gpio, pin);
 687                 if (ret < 0)
 688                         return ret;
 689
 690                 if (ret)
 691                         return -EINVAL;
 692
 693                 ret = sx150x_gpio_get(&pctl->gpio, pin);
 694                 if (ret < 0)
 695                         return ret;
 696
 697                 arg = ret;
 698                 break;
 699
 700         default:
 701                 return -ENOTSUPP;
 702         }
 703
 704 out:
 705         *config = pinconf_to_config_packed(param, arg);
 706
 707         return 0;
 708 }
 709
 710 static int sx150x_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
 711                               unsigned long *configs, unsigned int num_configs)
 712 {
 713         struct sx150x_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
 714         enum pin_config_param param;
 715         u32 arg;
 716         int i;
 717         int ret;
 718
 719         for (i = 0; i < num_configs; i++) {
 720                 param = pinconf_to_config_param(configs[i]);
 721                 arg = pinconf_to_config_argument(configs[i]);
 722
 723                 if (sx150x_pin_is_oscio(pctl, pin)) {
 724                         if (param == PIN_CONFIG_OUTPUT) {
 725                                 ret = sx150x_gpio_direction_output(&pctl->gpio,
 726                                                                    pin, arg);
 727                                 if (ret < 0)
 728                                         return ret;
 729
 730                                 continue;
 731                         } else
 732                                 return -ENOTSUPP;
 733                 }
 734
 735                 switch (param) {
 736                 case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
 737                 case PIN_CONFIG_BIAS_DISABLE:
 738                         ret = regmap_write_bits(pctl->regmap,
 739                                                 pctl->data->reg_pulldn,
 740                                                 BIT(pin), 0);
 741                         if (ret < 0)
 742                                 return ret;
 743
 744                         ret = regmap_write_bits(pctl->regmap,
 745                                                 pctl->data->reg_pullup,
 746                                                 BIT(pin), 0);
 747                         if (ret < 0)
 748                                 return ret;
 749
 750                         break;
 751
 752                 case PIN_CONFIG_BIAS_PULL_UP:
 753                         ret = regmap_write_bits(pctl->regmap,
 754                                                 pctl->data->reg_pullup,
 755                                                 BIT(pin), BIT(pin));
 756                         if (ret < 0)
 757                                 return ret;
 758
 759                         break;
 760
 761                 case PIN_CONFIG_BIAS_PULL_DOWN:
 762                         ret = regmap_write_bits(pctl->regmap,
 763                                                 pctl->data->reg_pulldn,
 764                                                 BIT(pin), BIT(pin));
 765                         if (ret < 0)
 766                                 return ret;
 767
 768                         break;
 769
 770                 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 771                         if (pctl->data->model != SX150X_789 ||
 772                             sx150x_pin_is_oscio(pctl, pin))
 773                                 return -ENOTSUPP;
 774
 775                         ret = regmap_write_bits(pctl->regmap,
 776                                                 pctl->data->pri.x789.reg_drain,
 777                                                 BIT(pin), BIT(pin));
 778                         if (ret < 0)
 779                                 return ret;
 780
 781                         break;
 782
 783                 case PIN_CONFIG_DRIVE_PUSH_PULL:
 784                         if (pctl->data->model != SX150X_789 ||
 785                             sx150x_pin_is_oscio(pctl, pin))
 786                                 return 0;
 787
 788                         ret = regmap_write_bits(pctl->regmap,
 789                                                 pctl->data->pri.x789.reg_drain,
 790                                                 BIT(pin), 0);
 791                         if (ret < 0)
 792                                 return ret;
 793
 794                         break;
 795
 796                 case PIN_CONFIG_OUTPUT:
 797                         ret = sx150x_gpio_direction_output(&pctl->gpio,
 798                                                            pin, arg);
 799                         if (ret < 0)
 800                                 return ret;
 801
 802                         break;
 803
 804                 default:
 805                         return -ENOTSUPP;
 806                 }
 807         } /* for each config */
 808
 809         return 0;
 810 }
 811
 812 static const struct pinconf_ops sx150x_pinconf_ops = {
 813         .pin_config_get = sx150x_pinconf_get,
 814         .pin_config_set = sx150x_pinconf_set,
 815         .is_generic = true,
 816 };
 817
 818 static const struct i2c_device_id sx150x_id[] = {
 819         {"sx1501q", (kernel_ulong_t) &sx1501q_device_data },
 820         {"sx1502q", (kernel_ulong_t) &sx1502q_device_data },
 821         {"sx1503q", (kernel_ulong_t) &sx1503q_device_data },
 822         {"sx1504q", (kernel_ulong_t) &sx1504q_device_data },
 823         {"sx1505q", (kernel_ulong_t) &sx1505q_device_data },
 824         {"sx1506q", (kernel_ulong_t) &sx1506q_device_data },
 825         {"sx1507q", (kernel_ulong_t) &sx1507q_device_data },
 826         {"sx1508q", (kernel_ulong_t) &sx1508q_device_data },
 827         {"sx1509q", (kernel_ulong_t) &sx1509q_device_data },
 828         {}
 829 };
 830
 831 static const struct of_device_id sx150x_of_match[] = {
 832         { .compatible = "semtech,sx1501q", .data = &sx1501q_device_data },
 833         { .compatible = "semtech,sx1502q", .data = &sx1502q_device_data },
 834         { .compatible = "semtech,sx1503q", .data = &sx1503q_device_data },
 835         { .compatible = "semtech,sx1504q", .data = &sx1504q_device_data },
 836         { .compatible = "semtech,sx1505q", .data = &sx1505q_device_data },
 837         { .compatible = "semtech,sx1506q", .data = &sx1506q_device_data },
 838         { .compatible = "semtech,sx1507q", .data = &sx1507q_device_data },
 839         { .compatible = "semtech,sx1508q", .data = &sx1508q_device_data },
 840         { .compatible = "semtech,sx1509q", .data = &sx1509q_device_data },
 841         {},
 842 };
 843
 844 static int sx150x_reset(struct sx150x_pinctrl *pctl)
 845 {
 846         int err;
 847
 848         err = i2c_smbus_write_byte_data(pctl->client,
 849                                         pctl->data->pri.x789.reg_reset,
 850                                         SX150X_789_RESET_KEY1);
 851         if (err < 0)
 852                 return err;
 853
 854         err = i2c_smbus_write_byte_data(pctl->client,
 855                                         pctl->data->pri.x789.reg_reset,
 856                                         SX150X_789_RESET_KEY2);
 857         return err;
 858 }
 859
 860 static int sx150x_init_misc(struct sx150x_pinctrl *pctl)
 861 {
 862         u8 reg, value;
 863
 864         switch (pctl->data->model) {
 865         case SX150X_789:
 866                 reg   = pctl->data->pri.x789.reg_misc;
 867                 value = SX150X_789_REG_MISC_AUTOCLEAR_OFF;
 868                 break;
 869         case SX150X_456:
 870                 reg   = pctl->data->pri.x456.reg_advanced;
 871                 value = 0x00;
 872
 873                 /*
 874                  * Only SX1506 has RegAdvanced, SX1504/5 are expected
 875                  * to initialize this offset to zero
 876                  */
 877                 if (!reg)
 878                         return 0;
 879                 break;
 880         case SX150X_123:
 881                 reg   = pctl->data->pri.x123.reg_advanced;
 882                 value = 0x00;
 883                 break;
 884         default:
 885                 WARN(1, "Unknown chip model %d\n", pctl->data->model);
 886                 return -EINVAL;
 887         }
 888
 889         return regmap_write(pctl->regmap, reg, value);
 890 }
 891
 892 static int sx150x_init_hw(struct sx150x_pinctrl *pctl)
 893 {
 894         const u8 reg[] = {
 895                 [SX150X_789] = pctl->data->pri.x789.reg_polarity,
 896                 [SX150X_456] = pctl->data->pri.x456.reg_pld_mode,
 897                 [SX150X_123] = pctl->data->pri.x123.reg_pld_mode,
 898         };
 899         int err;
 900
 901         if (pctl->data->model == SX150X_789 &&
 902             of_property_read_bool(pctl->dev->of_node, "semtech,probe-reset")) {
 903                 err = sx150x_reset(pctl);
 904                 if (err < 0)
 905                         return err;
 906         }
 907
 908         err = sx150x_init_misc(pctl);
 909         if (err < 0)
 910                 return err;
 911
 912         /* Set all pins to work in normal mode */
 913         return regmap_write(pctl->regmap, reg[pctl->data->model], 0);
 914 }
 915
 916 static int sx150x_regmap_reg_width(struct sx150x_pinctrl *pctl,
 917                                    unsigned int reg)
 918 {
 919         const struct sx150x_device_data *data = pctl->data;
 920
 921         if (reg == data->reg_sense) {
 922                 /*
 923                  * RegSense packs two bits of configuration per GPIO,
 924                  * so we'd need to read twice as many bits as there
 925                  * are GPIO in our chip
 926                  */
 927                 return 2 * data->ngpios;
 928         } else if ((data->model == SX150X_789 &&
 929                     (reg == data->pri.x789.reg_misc ||
 930                      reg == data->pri.x789.reg_clock ||
 931                      reg == data->pri.x789.reg_reset))
 932                    ||
 933                    (data->model == SX150X_123 &&
 934                     reg == data->pri.x123.reg_advanced)
 935                    ||
 936                    (data->model == SX150X_456 &&
 937                     data->pri.x456.reg_advanced &&
 938                     reg == data->pri.x456.reg_advanced)) {
 939                 return 8;
 940         } else {
 941                 return data->ngpios;
 942         }
 943 }
 944
 945 static unsigned int sx150x_maybe_swizzle(struct sx150x_pinctrl *pctl,
 946                                          unsigned int reg, unsigned int val)
 947 {
 948         unsigned int a, b;
 949         const struct sx150x_device_data *data = pctl->data;
 950
 951         /*
 952          * Whereas SX1509 presents RegSense in a simple layout as such:
 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          * SX1503 and SX1506 deviate from that data layout, instead storing
 959          * their contents as follows:
 960          *
 961          *      reg     [ f f e e d d c c ]
 962          *      reg + 1 [ 7 7 6 6 5 5 4 4 ]
 963          *      reg + 2 [ b b a a 9 9 8 8 ]
 964          *      reg + 3 [ 3 3 2 2 1 1 0 0 ]
 965          *
 966          * so, taking that into account, we swap two
 967          * inner bytes of a 4-byte result
 968          */
 969
 970         if (reg == data->reg_sense &&
 971             data->ngpios == 16 &&
 972             (data->model == SX150X_123 ||
 973              data->model == SX150X_456)) {
 974                 a = val & 0x00ff0000;
 975                 b = val & 0x0000ff00;
 976
 977                 val &= 0xff0000ff;
 978                 val |= b << 8;
 979                 val |= a >> 8;
 980         }
 981
 982         return val;
 983 }
 984
 985 /*
 986  * In order to mask the differences between 16 and 8 bit expander
 987  * devices we set up a sligthly ficticious regmap that pretends to be
 988  * a set of 32-bit (to accomodate RegSenseLow/RegSenseHigh
 989  * pair/quartet) registers and transparently reconstructs those
 990  * registers via multiple I2C/SMBus reads
 991  *
 992  * This way the rest of the driver code, interfacing with the chip via
 993  * regmap API, can work assuming that each GPIO pin is represented by
 994  * a group of bits at an offset proportional to GPIO number within a
 995  * given register.
 996  */
 997 static int sx150x_regmap_reg_read(void *context, unsigned int reg,
 998                                   unsigned int *result)
 999 {
1000         int ret, n;
1001         struct sx150x_pinctrl *pctl = context;
1002         struct i2c_client *i2c = pctl->client;
1003         const int width = sx150x_regmap_reg_width(pctl, reg);
1004         unsigned int idx, val;
1005
1006         /*
1007          * There are four potential cases covered by this function:
1008          *
1009          * 1) 8-pin chip, single configuration bit register
1010          *
1011          *      This is trivial the code below just needs to read:
1012          *              reg  [ 7 6 5 4 3 2 1 0 ]
1013          *
1014          * 2) 8-pin chip, double configuration bit register (RegSense)
1015          *
1016          *      The read will be done as follows:
1017          *              reg      [ 7 7 6 6 5 5 4 4 ]
1018          *              reg + 1  [ 3 3 2 2 1 1 0 0 ]
1019          *
1020          * 3) 16-pin chip, single configuration bit register
1021          *
1022          *      The read will be done as follows:
1023          *              reg     [ f e d c b a 9 8 ]
1024          *              reg + 1 [ 7 6 5 4 3 2 1 0 ]
1025          *
1026          * 4) 16-pin chip, double configuration bit register (RegSense)
1027          *
1028          *      The read will be done as follows:
1029          *              reg     [ f f e e d d c c ]
1030          *              reg + 1 [ b b a a 9 9 8 8 ]
1031          *              reg + 2 [ 7 7 6 6 5 5 4 4 ]
1032          *              reg + 3 [ 3 3 2 2 1 1 0 0 ]
1033          */
1034
1035         for (n = width, val = 0, idx = reg; n > 0; n -= 8, idx++) {
1036                 val <<= 8;
1037
1038                 ret = i2c_smbus_read_byte_data(i2c, idx);
1039                 if (ret < 0)
1040                         return ret;
1041
1042                 val |= ret;
1043         }
1044
1045         *result = sx150x_maybe_swizzle(pctl, reg, val);
1046
1047         return 0;
1048 }
1049
1050 static int sx150x_regmap_reg_write(void *context, unsigned int reg,
1051                                    unsigned int val)
1052 {
1053         int ret, n;
1054         struct sx150x_pinctrl *pctl = context;
1055         struct i2c_client *i2c = pctl->client;
1056         const int width = sx150x_regmap_reg_width(pctl, reg);
1057
1058         val = sx150x_maybe_swizzle(pctl, reg, val);
1059
1060         n = (width - 1) & ~7;
1061         do {
1062                 const u8 byte = (val >> n) & 0xff;
1063
1064                 ret = i2c_smbus_write_byte_data(i2c, reg, byte);
1065                 if (ret < 0)
1066                         return ret;
1067
1068                 reg++;
1069                 n -= 8;
1070         } while (n >= 0);
1071
1072         return 0;
1073 }
1074
1075 static bool sx150x_reg_volatile(struct device *dev, unsigned int reg)
1076 {
1077         struct sx150x_pinctrl *pctl = i2c_get_clientdata(to_i2c_client(dev));
1078
1079         return reg == pctl->data->reg_irq_src || reg == pctl->data->reg_data;
1080 }
1081
1082 static const struct regmap_config sx150x_regmap_config = {
1083         .reg_bits = 8,
1084         .val_bits = 32,
1085
1086         .cache_type = REGCACHE_RBTREE,
1087
1088         .reg_read = sx150x_regmap_reg_read,
1089         .reg_write = sx150x_regmap_reg_write,
1090
1091         .max_register = SX150X_MAX_REGISTER,
1092         .volatile_reg = sx150x_reg_volatile,
1093 };
1094
1095 static int sx150x_probe(struct i2c_client *client,
1096                         const struct i2c_device_id *id)
1097 {
1098         static const u32 i2c_funcs = I2C_FUNC_SMBUS_BYTE_DATA |
1099                                      I2C_FUNC_SMBUS_WRITE_WORD_DATA;
1100         struct device *dev = &client->dev;
1101         struct sx150x_pinctrl *pctl;
1102         int ret;
1103
1104         if (!i2c_check_functionality(client->adapter, i2c_funcs))
1105                 return -ENOSYS;
1106
1107         pctl = devm_kzalloc(dev, sizeof(*pctl), GFP_KERNEL);
1108         if (!pctl)
1109                 return -ENOMEM;
1110
1111         i2c_set_clientdata(client, pctl);
1112
1113         pctl->dev = dev;
1114         pctl->client = client;
1115
1116         if (dev->of_node)
1117                 pctl->data = of_device_get_match_data(dev);
1118         else
1119                 pctl->data = (struct sx150x_device_data *)id->driver_data;
1120
1121         if (!pctl->data)
1122                 return -EINVAL;
1123
1124         pctl->regmap = devm_regmap_init(dev, NULL, pctl,
1125                                         &sx150x_regmap_config);
1126         if (IS_ERR(pctl->regmap)) {
1127                 ret = PTR_ERR(pctl->regmap);
1128                 dev_err(dev, "Failed to allocate register map: %d\n",
1129                         ret);
1130                 return ret;
1131         }
1132
1133         mutex_init(&pctl->lock);
1134
1135         ret = sx150x_init_hw(pctl);
1136         if (ret)
1137                 return ret;
1138
1139         /* Pinctrl_desc */
1140         pctl->pinctrl_desc.name = "sx150x-pinctrl";
1141         pctl->pinctrl_desc.pctlops = &sx150x_pinctrl_ops;
1142         pctl->pinctrl_desc.confops = &sx150x_pinconf_ops;
1143         pctl->pinctrl_desc.pins = pctl->data->pins;
1144         pctl->pinctrl_desc.npins = pctl->data->npins;
1145         pctl->pinctrl_desc.owner = THIS_MODULE;
1146
1147         ret = devm_pinctrl_register_and_init(dev, &pctl->pinctrl_desc,
1148                                              pctl, &pctl->pctldev);
1149         if (ret) {
1150                 dev_err(dev, "Failed to register pinctrl device\n");
1151                 return ret;
1152         }
1153
1154         ret = pinctrl_enable(pctl->pctldev);
1155         if (ret) {
1156                 dev_err(dev, "Failed to enable pinctrl device\n");
1157                 return ret;
1158         }
1159
1160         /* Register GPIO controller */
1161         pctl->gpio.base = -1;
1162         pctl->gpio.ngpio = pctl->data->npins;
1163         pctl->gpio.get_direction = sx150x_gpio_get_direction;
1164         pctl->gpio.direction_input = sx150x_gpio_direction_input;
1165         pctl->gpio.direction_output = sx150x_gpio_direction_output;
1166         pctl->gpio.get = sx150x_gpio_get;
1167         pctl->gpio.set = sx150x_gpio_set;
1168         pctl->gpio.set_config = gpiochip_generic_config;
1169         pctl->gpio.parent = dev;
1170 #ifdef CONFIG_OF_GPIO
1171         pctl->gpio.of_node = dev->of_node;
1172 #endif
1173         pctl->gpio.can_sleep = true;
1174         pctl->gpio.label = devm_kstrdup(dev, client->name, GFP_KERNEL);
1175         if (!pctl->gpio.label)
1176                 return -ENOMEM;
1177
1178         /*
1179          * Setting multiple pins is not safe when all pins are not
1180          * handled by the same regmap register. The oscio pin (present
1181          * on the SX150X_789 chips) lives in its own register, so
1182          * would require locking that is not in place at this time.
1183          */
1184         if (pctl->data->model != SX150X_789)
1185                 pctl->gpio.set_multiple = sx150x_gpio_set_multiple;
1186
1187         ret = devm_gpiochip_add_data(dev, &pctl->gpio, pctl);
1188         if (ret)
1189                 return ret;
1190
1191         ret = gpiochip_add_pin_range(&pctl->gpio, dev_name(dev),
1192                                      0, 0, pctl->data->npins);
1193         if (ret)
1194                 return ret;
1195
1196         /* Add Interrupt support if an irq is specified */
1197         if (client->irq > 0) {
1198                 pctl->irq_chip.irq_mask = sx150x_irq_mask;
1199                 pctl->irq_chip.irq_unmask = sx150x_irq_unmask;
1200                 pctl->irq_chip.irq_set_type = sx150x_irq_set_type;
1201                 pctl->irq_chip.irq_bus_lock = sx150x_irq_bus_lock;
1202                 pctl->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock;
1203                 pctl->irq_chip.name = devm_kstrdup(dev, client->name,
1204                                                    GFP_KERNEL);
1205                 if (!pctl->irq_chip.name)
1206                         return -ENOMEM;
1207
1208                 pctl->irq.masked = ~0;
1209                 pctl->irq.sense = 0;
1210
1211                 /*
1212                  * Because sx150x_irq_threaded_fn invokes all of the
1213                  * nested interrrupt handlers via handle_nested_irq,
1214                  * any "handler" passed to gpiochip_irqchip_add()
1215                  * below is going to be ignored, so the choice of the
1216                  * function does not matter that much.
1217                  *
1218                  * We set it to handle_bad_irq to avoid confusion,
1219                  * plus it will be instantly noticeable if it is ever
1220                  * called (should not happen)
1221                  */
1222                 ret = gpiochip_irqchip_add_nested(&pctl->gpio,
1223                                         &pctl->irq_chip, 0,
1224                                         handle_bad_irq, IRQ_TYPE_NONE);
1225                 if (ret) {
1226                         dev_err(dev, "could not connect irqchip to gpiochip\n");
1227                         return ret;
1228                 }
1229
1230                 ret = devm_request_threaded_irq(dev, client->irq, NULL,
1231                                                 sx150x_irq_thread_fn,
1232                                                 IRQF_ONESHOT | IRQF_SHARED |
1233                                                 IRQF_TRIGGER_FALLING,
1234                                                 pctl->irq_chip.name, pctl);
1235                 if (ret < 0)
1236                         return ret;
1237
1238                 gpiochip_set_nested_irqchip(&pctl->gpio,
1239                                             &pctl->irq_chip,
1240                                             client->irq);
1241         }
1242
1243         return 0;
1244 }
1245
1246 static struct i2c_driver sx150x_driver = {
1247         .driver = {
1248                 .name = "sx150x-pinctrl",
1249                 .of_match_table = of_match_ptr(sx150x_of_match),
1250         },
1251         .probe    = sx150x_probe,
1252         .id_table = sx150x_id,
1253 };
1254
1255 static int __init sx150x_init(void)
1256 {
1257         return i2c_add_driver(&sx150x_driver);
1258 }
1259 subsys_initcall(sx150x_init);