1/* 2 * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 and 6 * only version 2 as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14#include <linux/gpio.h> 15#include <linux/module.h> 16#include <linux/of.h> 17#include <linux/pinctrl/pinconf-generic.h> 18#include <linux/pinctrl/pinconf.h> 19#include <linux/pinctrl/pinmux.h> 20#include <linux/platform_device.h> 21#include <linux/regmap.h> 22#include <linux/slab.h> 23#include <linux/types.h> 24 25#include <dt-bindings/pinctrl/qcom,pmic-gpio.h> 26 27#include "../core.h" 28#include "../pinctrl-utils.h" 29 30#define PMIC_GPIO_ADDRESS_RANGE 0x100 31 32/* type and subtype registers base address offsets */ 33#define PMIC_GPIO_REG_TYPE 0x4 34#define PMIC_GPIO_REG_SUBTYPE 0x5 35 36/* GPIO peripheral type and subtype out_values */ 37#define PMIC_GPIO_TYPE 0x10 38#define PMIC_GPIO_SUBTYPE_GPIO_4CH 0x1 39#define PMIC_GPIO_SUBTYPE_GPIOC_4CH 0x5 40#define PMIC_GPIO_SUBTYPE_GPIO_8CH 0x9 41#define PMIC_GPIO_SUBTYPE_GPIOC_8CH 0xd 42 43#define PMIC_MPP_REG_RT_STS 0x10 44#define PMIC_MPP_REG_RT_STS_VAL_MASK 0x1 45 46/* control register base address offsets */ 47#define PMIC_GPIO_REG_MODE_CTL 0x40 48#define PMIC_GPIO_REG_DIG_VIN_CTL 0x41 49#define PMIC_GPIO_REG_DIG_PULL_CTL 0x42 50#define PMIC_GPIO_REG_DIG_OUT_CTL 0x45 51#define PMIC_GPIO_REG_EN_CTL 0x46 52 53/* PMIC_GPIO_REG_MODE_CTL */ 54#define PMIC_GPIO_REG_MODE_VALUE_SHIFT 0x1 55#define PMIC_GPIO_REG_MODE_FUNCTION_SHIFT 1 56#define PMIC_GPIO_REG_MODE_FUNCTION_MASK 0x7 57#define PMIC_GPIO_REG_MODE_DIR_SHIFT 4 58#define PMIC_GPIO_REG_MODE_DIR_MASK 0x7 59 60/* PMIC_GPIO_REG_DIG_VIN_CTL */ 61#define PMIC_GPIO_REG_VIN_SHIFT 0 62#define PMIC_GPIO_REG_VIN_MASK 0x7 63 64/* PMIC_GPIO_REG_DIG_PULL_CTL */ 65#define PMIC_GPIO_REG_PULL_SHIFT 0 66#define PMIC_GPIO_REG_PULL_MASK 0x7 67 68#define PMIC_GPIO_PULL_DOWN 4 69#define PMIC_GPIO_PULL_DISABLE 5 70 71/* PMIC_GPIO_REG_DIG_OUT_CTL */ 72#define PMIC_GPIO_REG_OUT_STRENGTH_SHIFT 0 73#define PMIC_GPIO_REG_OUT_STRENGTH_MASK 0x3 74#define PMIC_GPIO_REG_OUT_TYPE_SHIFT 4 75#define PMIC_GPIO_REG_OUT_TYPE_MASK 0x3 76 77/* 78 * Output type - indicates pin should be configured as push-pull, 79 * open drain or open source. 80 */ 81#define PMIC_GPIO_OUT_BUF_CMOS 0 82#define PMIC_GPIO_OUT_BUF_OPEN_DRAIN_NMOS 1 83#define PMIC_GPIO_OUT_BUF_OPEN_DRAIN_PMOS 2 84 85/* PMIC_GPIO_REG_EN_CTL */ 86#define PMIC_GPIO_REG_MASTER_EN_SHIFT 7 87 88#define PMIC_GPIO_PHYSICAL_OFFSET 1 89 90/* Qualcomm specific pin configurations */ 91#define PMIC_GPIO_CONF_PULL_UP (PIN_CONFIG_END + 1) 92#define PMIC_GPIO_CONF_STRENGTH (PIN_CONFIG_END + 2) 93 94/** 95 * struct pmic_gpio_pad - keep current GPIO settings 96 * @base: Address base in SPMI device. 97 * @irq: IRQ number which this GPIO generate. 98 * @is_enabled: Set to false when GPIO should be put in high Z state. 99 * @out_value: Cached pin output value 100 * @have_buffer: Set to true if GPIO output could be configured in push-pull, 101 * open-drain or open-source mode. 102 * @output_enabled: Set to true if GPIO output logic is enabled. 103 * @input_enabled: Set to true if GPIO input buffer logic is enabled. 104 * @num_sources: Number of power-sources supported by this GPIO. 105 * @power_source: Current power-source used. 106 * @buffer_type: Push-pull, open-drain or open-source. 107 * @pullup: Constant current which flow trough GPIO output buffer. 108 * @strength: No, Low, Medium, High 109 * @function: See pmic_gpio_functions[] 110 */ 111struct pmic_gpio_pad { 112 u16 base; 113 int irq; 114 bool is_enabled; 115 bool out_value; 116 bool have_buffer; 117 bool output_enabled; 118 bool input_enabled; 119 unsigned int num_sources; 120 unsigned int power_source; 121 unsigned int buffer_type; 122 unsigned int pullup; 123 unsigned int strength; 124 unsigned int function; 125}; 126 127struct pmic_gpio_state { 128 struct device *dev; 129 struct regmap *map; 130 struct pinctrl_dev *ctrl; 131 struct gpio_chip chip; 132}; 133 134static const struct pinconf_generic_params pmic_gpio_bindings[] = { 135 {"qcom,pull-up-strength", PMIC_GPIO_CONF_PULL_UP, 0}, 136 {"qcom,drive-strength", PMIC_GPIO_CONF_STRENGTH, 0}, 137}; 138 139#ifdef CONFIG_DEBUG_FS 140static const struct pin_config_item pmic_conf_items[ARRAY_SIZE(pmic_gpio_bindings)] = { 141 PCONFDUMP(PMIC_GPIO_CONF_PULL_UP, "pull up strength", NULL, true), 142 PCONFDUMP(PMIC_GPIO_CONF_STRENGTH, "drive-strength", NULL, true), 143}; 144#endif 145 146static const char *const pmic_gpio_groups[] = { 147 "gpio1", "gpio2", "gpio3", "gpio4", "gpio5", "gpio6", "gpio7", "gpio8", 148 "gpio9", "gpio10", "gpio11", "gpio12", "gpio13", "gpio14", "gpio15", 149 "gpio16", "gpio17", "gpio18", "gpio19", "gpio20", "gpio21", "gpio22", 150 "gpio23", "gpio24", "gpio25", "gpio26", "gpio27", "gpio28", "gpio29", 151 "gpio30", "gpio31", "gpio32", "gpio33", "gpio34", "gpio35", "gpio36", 152}; 153 154static const char *const pmic_gpio_functions[] = { 155 PMIC_GPIO_FUNC_NORMAL, PMIC_GPIO_FUNC_PAIRED, 156 PMIC_GPIO_FUNC_FUNC1, PMIC_GPIO_FUNC_FUNC2, 157 PMIC_GPIO_FUNC_DTEST1, PMIC_GPIO_FUNC_DTEST2, 158 PMIC_GPIO_FUNC_DTEST3, PMIC_GPIO_FUNC_DTEST4, 159}; 160 161static inline struct pmic_gpio_state *to_gpio_state(struct gpio_chip *chip) 162{ 163 return container_of(chip, struct pmic_gpio_state, chip); 164}; 165 166static int pmic_gpio_read(struct pmic_gpio_state *state, 167 struct pmic_gpio_pad *pad, unsigned int addr) 168{ 169 unsigned int val; 170 int ret; 171 172 ret = regmap_read(state->map, pad->base + addr, &val); 173 if (ret < 0) 174 dev_err(state->dev, "read 0x%x failed\n", addr); 175 else 176 ret = val; 177 178 return ret; 179} 180 181static int pmic_gpio_write(struct pmic_gpio_state *state, 182 struct pmic_gpio_pad *pad, unsigned int addr, 183 unsigned int val) 184{ 185 int ret; 186 187 ret = regmap_write(state->map, pad->base + addr, val); 188 if (ret < 0) 189 dev_err(state->dev, "write 0x%x failed\n", addr); 190 191 return ret; 192} 193 194static int pmic_gpio_get_groups_count(struct pinctrl_dev *pctldev) 195{ 196 /* Every PIN is a group */ 197 return pctldev->desc->npins; 198} 199 200static const char *pmic_gpio_get_group_name(struct pinctrl_dev *pctldev, 201 unsigned pin) 202{ 203 return pctldev->desc->pins[pin].name; 204} 205 206static int pmic_gpio_get_group_pins(struct pinctrl_dev *pctldev, unsigned pin, 207 const unsigned **pins, unsigned *num_pins) 208{ 209 *pins = &pctldev->desc->pins[pin].number; 210 *num_pins = 1; 211 return 0; 212} 213 214static const struct pinctrl_ops pmic_gpio_pinctrl_ops = { 215 .get_groups_count = pmic_gpio_get_groups_count, 216 .get_group_name = pmic_gpio_get_group_name, 217 .get_group_pins = pmic_gpio_get_group_pins, 218 .dt_node_to_map = pinconf_generic_dt_node_to_map_group, 219 .dt_free_map = pinctrl_utils_dt_free_map, 220}; 221 222static int pmic_gpio_get_functions_count(struct pinctrl_dev *pctldev) 223{ 224 return ARRAY_SIZE(pmic_gpio_functions); 225} 226 227static const char *pmic_gpio_get_function_name(struct pinctrl_dev *pctldev, 228 unsigned function) 229{ 230 return pmic_gpio_functions[function]; 231} 232 233static int pmic_gpio_get_function_groups(struct pinctrl_dev *pctldev, 234 unsigned function, 235 const char *const **groups, 236 unsigned *const num_qgroups) 237{ 238 *groups = pmic_gpio_groups; 239 *num_qgroups = pctldev->desc->npins; 240 return 0; 241} 242 243static int pmic_gpio_set_mux(struct pinctrl_dev *pctldev, unsigned function, 244 unsigned pin) 245{ 246 struct pmic_gpio_state *state = pinctrl_dev_get_drvdata(pctldev); 247 struct pmic_gpio_pad *pad; 248 unsigned int val; 249 int ret; 250 251 pad = pctldev->desc->pins[pin].drv_data; 252 253 pad->function = function; 254 255 val = 0; 256 if (pad->output_enabled) { 257 if (pad->input_enabled) 258 val = 2; 259 else 260 val = 1; 261 } 262 263 val = val << PMIC_GPIO_REG_MODE_DIR_SHIFT; 264 val |= pad->function << PMIC_GPIO_REG_MODE_FUNCTION_SHIFT; 265 val |= pad->out_value & PMIC_GPIO_REG_MODE_VALUE_SHIFT; 266 267 ret = pmic_gpio_write(state, pad, PMIC_GPIO_REG_MODE_CTL, val); 268 if (ret < 0) 269 return ret; 270 271 val = pad->is_enabled << PMIC_GPIO_REG_MASTER_EN_SHIFT; 272 273 return pmic_gpio_write(state, pad, PMIC_GPIO_REG_EN_CTL, val); 274} 275 276static const struct pinmux_ops pmic_gpio_pinmux_ops = { 277 .get_functions_count = pmic_gpio_get_functions_count, 278 .get_function_name = pmic_gpio_get_function_name, 279 .get_function_groups = pmic_gpio_get_function_groups, 280 .set_mux = pmic_gpio_set_mux, 281}; 282 283static int pmic_gpio_config_get(struct pinctrl_dev *pctldev, 284 unsigned int pin, unsigned long *config) 285{ 286 unsigned param = pinconf_to_config_param(*config); 287 struct pmic_gpio_pad *pad; 288 unsigned arg; 289 290 pad = pctldev->desc->pins[pin].drv_data; 291 292 switch (param) { 293 case PIN_CONFIG_DRIVE_PUSH_PULL: 294 arg = pad->buffer_type == PMIC_GPIO_OUT_BUF_CMOS; 295 break; 296 case PIN_CONFIG_DRIVE_OPEN_DRAIN: 297 arg = pad->buffer_type == PMIC_GPIO_OUT_BUF_OPEN_DRAIN_NMOS; 298 break; 299 case PIN_CONFIG_DRIVE_OPEN_SOURCE: 300 arg = pad->buffer_type == PMIC_GPIO_OUT_BUF_OPEN_DRAIN_PMOS; 301 break; 302 case PIN_CONFIG_BIAS_PULL_DOWN: 303 arg = pad->pullup == PMIC_GPIO_PULL_DOWN; 304 break; 305 case PIN_CONFIG_BIAS_DISABLE: 306 arg = pad->pullup = PMIC_GPIO_PULL_DISABLE; 307 break; 308 case PIN_CONFIG_BIAS_PULL_UP: 309 arg = pad->pullup == PMIC_GPIO_PULL_UP_30; 310 break; 311 case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: 312 arg = !pad->is_enabled; 313 break; 314 case PIN_CONFIG_POWER_SOURCE: 315 arg = pad->power_source; 316 break; 317 case PIN_CONFIG_INPUT_ENABLE: 318 arg = pad->input_enabled; 319 break; 320 case PIN_CONFIG_OUTPUT: 321 arg = pad->out_value; 322 break; 323 case PMIC_GPIO_CONF_PULL_UP: 324 arg = pad->pullup; 325 break; 326 case PMIC_GPIO_CONF_STRENGTH: 327 arg = pad->strength; 328 break; 329 default: 330 return -EINVAL; 331 } 332 333 *config = pinconf_to_config_packed(param, arg); 334 return 0; 335} 336 337static int pmic_gpio_config_set(struct pinctrl_dev *pctldev, unsigned int pin, 338 unsigned long *configs, unsigned nconfs) 339{ 340 struct pmic_gpio_state *state = pinctrl_dev_get_drvdata(pctldev); 341 struct pmic_gpio_pad *pad; 342 unsigned param, arg; 343 unsigned int val; 344 int i, ret; 345 346 pad = pctldev->desc->pins[pin].drv_data; 347 348 for (i = 0; i < nconfs; i++) { 349 param = pinconf_to_config_param(configs[i]); 350 arg = pinconf_to_config_argument(configs[i]); 351 352 switch (param) { 353 case PIN_CONFIG_DRIVE_PUSH_PULL: 354 pad->buffer_type = PMIC_GPIO_OUT_BUF_CMOS; 355 break; 356 case PIN_CONFIG_DRIVE_OPEN_DRAIN: 357 if (!pad->have_buffer) 358 return -EINVAL; 359 pad->buffer_type = PMIC_GPIO_OUT_BUF_OPEN_DRAIN_NMOS; 360 break; 361 case PIN_CONFIG_DRIVE_OPEN_SOURCE: 362 if (!pad->have_buffer) 363 return -EINVAL; 364 pad->buffer_type = PMIC_GPIO_OUT_BUF_OPEN_DRAIN_PMOS; 365 break; 366 case PIN_CONFIG_BIAS_DISABLE: 367 pad->pullup = PMIC_GPIO_PULL_DISABLE; 368 break; 369 case PIN_CONFIG_BIAS_PULL_UP: 370 pad->pullup = PMIC_GPIO_PULL_UP_30; 371 break; 372 case PIN_CONFIG_BIAS_PULL_DOWN: 373 if (arg) 374 pad->pullup = PMIC_GPIO_PULL_DOWN; 375 else 376 pad->pullup = PMIC_GPIO_PULL_DISABLE; 377 break; 378 case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: 379 pad->is_enabled = false; 380 break; 381 case PIN_CONFIG_POWER_SOURCE: 382 if (arg > pad->num_sources) 383 return -EINVAL; 384 pad->power_source = arg; 385 break; 386 case PIN_CONFIG_INPUT_ENABLE: 387 pad->input_enabled = arg ? true : false; 388 break; 389 case PIN_CONFIG_OUTPUT: 390 pad->output_enabled = true; 391 pad->out_value = arg; 392 break; 393 case PMIC_GPIO_CONF_PULL_UP: 394 if (arg > PMIC_GPIO_PULL_UP_1P5_30) 395 return -EINVAL; 396 pad->pullup = arg; 397 break; 398 case PMIC_GPIO_CONF_STRENGTH: 399 if (arg > PMIC_GPIO_STRENGTH_LOW) 400 return -EINVAL; 401 pad->strength = arg; 402 break; 403 default: 404 return -EINVAL; 405 } 406 } 407 408 val = pad->power_source << PMIC_GPIO_REG_VIN_SHIFT; 409 410 ret = pmic_gpio_write(state, pad, PMIC_GPIO_REG_DIG_VIN_CTL, val); 411 if (ret < 0) 412 return ret; 413 414 val = pad->pullup << PMIC_GPIO_REG_PULL_SHIFT; 415 416 ret = pmic_gpio_write(state, pad, PMIC_GPIO_REG_DIG_PULL_CTL, val); 417 if (ret < 0) 418 return ret; 419 420 val = pad->buffer_type << PMIC_GPIO_REG_OUT_TYPE_SHIFT; 421 val |= pad->strength << PMIC_GPIO_REG_OUT_STRENGTH_SHIFT; 422 423 ret = pmic_gpio_write(state, pad, PMIC_GPIO_REG_DIG_OUT_CTL, val); 424 if (ret < 0) 425 return ret; 426 427 val = 0; 428 if (pad->output_enabled) { 429 if (pad->input_enabled) 430 val = 2; 431 else 432 val = 1; 433 } 434 435 val = val << PMIC_GPIO_REG_MODE_DIR_SHIFT; 436 val |= pad->function << PMIC_GPIO_REG_MODE_FUNCTION_SHIFT; 437 val |= pad->out_value & PMIC_GPIO_REG_MODE_VALUE_SHIFT; 438 439 return pmic_gpio_write(state, pad, PMIC_GPIO_REG_MODE_CTL, val); 440} 441 442static void pmic_gpio_config_dbg_show(struct pinctrl_dev *pctldev, 443 struct seq_file *s, unsigned pin) 444{ 445 struct pmic_gpio_state *state = pinctrl_dev_get_drvdata(pctldev); 446 struct pmic_gpio_pad *pad; 447 int ret, val; 448 449 static const char *const biases[] = { 450 "pull-up 30uA", "pull-up 1.5uA", "pull-up 31.5uA", 451 "pull-up 1.5uA + 30uA boost", "pull-down 10uA", "no pull" 452 }; 453 static const char *const buffer_types[] = { 454 "push-pull", "open-drain", "open-source" 455 }; 456 static const char *const strengths[] = { 457 "no", "high", "medium", "low" 458 }; 459 460 pad = pctldev->desc->pins[pin].drv_data; 461 462 seq_printf(s, " gpio%-2d:", pin + PMIC_GPIO_PHYSICAL_OFFSET); 463 464 val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_EN_CTL); 465 466 if (val < 0 || !(val >> PMIC_GPIO_REG_MASTER_EN_SHIFT)) { 467 seq_puts(s, " ---"); 468 } else { 469 470 if (pad->input_enabled) { 471 ret = pmic_gpio_read(state, pad, PMIC_MPP_REG_RT_STS); 472 if (ret < 0) 473 return; 474 475 ret &= PMIC_MPP_REG_RT_STS_VAL_MASK; 476 pad->out_value = ret; 477 } 478 479 seq_printf(s, " %-4s", pad->output_enabled ? "out" : "in"); 480 seq_printf(s, " %-7s", pmic_gpio_functions[pad->function]); 481 seq_printf(s, " vin-%d", pad->power_source); 482 seq_printf(s, " %-27s", biases[pad->pullup]); 483 seq_printf(s, " %-10s", buffer_types[pad->buffer_type]); 484 seq_printf(s, " %-4s", pad->out_value ? "high" : "low"); 485 seq_printf(s, " %-7s", strengths[pad->strength]); 486 } 487} 488 489static const struct pinconf_ops pmic_gpio_pinconf_ops = { 490 .is_generic = true, 491 .pin_config_group_get = pmic_gpio_config_get, 492 .pin_config_group_set = pmic_gpio_config_set, 493 .pin_config_group_dbg_show = pmic_gpio_config_dbg_show, 494}; 495 496static int pmic_gpio_direction_input(struct gpio_chip *chip, unsigned pin) 497{ 498 struct pmic_gpio_state *state = to_gpio_state(chip); 499 unsigned long config; 500 501 config = pinconf_to_config_packed(PIN_CONFIG_INPUT_ENABLE, 1); 502 503 return pmic_gpio_config_set(state->ctrl, pin, &config, 1); 504} 505 506static int pmic_gpio_direction_output(struct gpio_chip *chip, 507 unsigned pin, int val) 508{ 509 struct pmic_gpio_state *state = to_gpio_state(chip); 510 unsigned long config; 511 512 config = pinconf_to_config_packed(PIN_CONFIG_OUTPUT, val); 513 514 return pmic_gpio_config_set(state->ctrl, pin, &config, 1); 515} 516 517static int pmic_gpio_get(struct gpio_chip *chip, unsigned pin) 518{ 519 struct pmic_gpio_state *state = to_gpio_state(chip); 520 struct pmic_gpio_pad *pad; 521 int ret; 522 523 pad = state->ctrl->desc->pins[pin].drv_data; 524 525 if (!pad->is_enabled) 526 return -EINVAL; 527 528 if (pad->input_enabled) { 529 ret = pmic_gpio_read(state, pad, PMIC_MPP_REG_RT_STS); 530 if (ret < 0) 531 return ret; 532 533 pad->out_value = ret & PMIC_MPP_REG_RT_STS_VAL_MASK; 534 } 535 536 return pad->out_value; 537} 538 539static void pmic_gpio_set(struct gpio_chip *chip, unsigned pin, int value) 540{ 541 struct pmic_gpio_state *state = to_gpio_state(chip); 542 unsigned long config; 543 544 config = pinconf_to_config_packed(PIN_CONFIG_OUTPUT, value); 545 546 pmic_gpio_config_set(state->ctrl, pin, &config, 1); 547} 548 549static int pmic_gpio_request(struct gpio_chip *chip, unsigned base) 550{ 551 return pinctrl_request_gpio(chip->base + base); 552} 553 554static void pmic_gpio_free(struct gpio_chip *chip, unsigned base) 555{ 556 pinctrl_free_gpio(chip->base + base); 557} 558 559static int pmic_gpio_of_xlate(struct gpio_chip *chip, 560 const struct of_phandle_args *gpio_desc, 561 u32 *flags) 562{ 563 if (chip->of_gpio_n_cells < 2) 564 return -EINVAL; 565 566 if (flags) 567 *flags = gpio_desc->args[1]; 568 569 return gpio_desc->args[0] - PMIC_GPIO_PHYSICAL_OFFSET; 570} 571 572static int pmic_gpio_to_irq(struct gpio_chip *chip, unsigned pin) 573{ 574 struct pmic_gpio_state *state = to_gpio_state(chip); 575 struct pmic_gpio_pad *pad; 576 577 pad = state->ctrl->desc->pins[pin].drv_data; 578 579 return pad->irq; 580} 581 582static void pmic_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) 583{ 584 struct pmic_gpio_state *state = to_gpio_state(chip); 585 unsigned i; 586 587 for (i = 0; i < chip->ngpio; i++) { 588 pmic_gpio_config_dbg_show(state->ctrl, s, i); 589 seq_puts(s, "\n"); 590 } 591} 592 593static const struct gpio_chip pmic_gpio_gpio_template = { 594 .direction_input = pmic_gpio_direction_input, 595 .direction_output = pmic_gpio_direction_output, 596 .get = pmic_gpio_get, 597 .set = pmic_gpio_set, 598 .request = pmic_gpio_request, 599 .free = pmic_gpio_free, 600 .of_xlate = pmic_gpio_of_xlate, 601 .to_irq = pmic_gpio_to_irq, 602 .dbg_show = pmic_gpio_dbg_show, 603}; 604 605static int pmic_gpio_populate(struct pmic_gpio_state *state, 606 struct pmic_gpio_pad *pad) 607{ 608 int type, subtype, val, dir; 609 610 type = pmic_gpio_read(state, pad, PMIC_GPIO_REG_TYPE); 611 if (type < 0) 612 return type; 613 614 if (type != PMIC_GPIO_TYPE) { 615 dev_err(state->dev, "incorrect block type 0x%x at 0x%x\n", 616 type, pad->base); 617 return -ENODEV; 618 } 619 620 subtype = pmic_gpio_read(state, pad, PMIC_GPIO_REG_SUBTYPE); 621 if (subtype < 0) 622 return subtype; 623 624 switch (subtype) { 625 case PMIC_GPIO_SUBTYPE_GPIO_4CH: 626 pad->have_buffer = true; 627 case PMIC_GPIO_SUBTYPE_GPIOC_4CH: 628 pad->num_sources = 4; 629 break; 630 case PMIC_GPIO_SUBTYPE_GPIO_8CH: 631 pad->have_buffer = true; 632 case PMIC_GPIO_SUBTYPE_GPIOC_8CH: 633 pad->num_sources = 8; 634 break; 635 default: 636 dev_err(state->dev, "unknown GPIO type 0x%x\n", subtype); 637 return -ENODEV; 638 } 639 640 val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_MODE_CTL); 641 if (val < 0) 642 return val; 643 644 pad->out_value = val & PMIC_GPIO_REG_MODE_VALUE_SHIFT; 645 646 dir = val >> PMIC_GPIO_REG_MODE_DIR_SHIFT; 647 dir &= PMIC_GPIO_REG_MODE_DIR_MASK; 648 switch (dir) { 649 case 0: 650 pad->input_enabled = true; 651 pad->output_enabled = false; 652 break; 653 case 1: 654 pad->input_enabled = false; 655 pad->output_enabled = true; 656 break; 657 case 2: 658 pad->input_enabled = true; 659 pad->output_enabled = true; 660 break; 661 default: 662 dev_err(state->dev, "unknown GPIO direction\n"); 663 return -ENODEV; 664 } 665 666 pad->function = val >> PMIC_GPIO_REG_MODE_FUNCTION_SHIFT; 667 pad->function &= PMIC_GPIO_REG_MODE_FUNCTION_MASK; 668 669 val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_DIG_VIN_CTL); 670 if (val < 0) 671 return val; 672 673 pad->power_source = val >> PMIC_GPIO_REG_VIN_SHIFT; 674 pad->power_source &= PMIC_GPIO_REG_VIN_MASK; 675 676 val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_DIG_PULL_CTL); 677 if (val < 0) 678 return val; 679 680 pad->pullup = val >> PMIC_GPIO_REG_PULL_SHIFT; 681 pad->pullup &= PMIC_GPIO_REG_PULL_MASK; 682 683 val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_DIG_OUT_CTL); 684 if (val < 0) 685 return val; 686 687 pad->strength = val >> PMIC_GPIO_REG_OUT_STRENGTH_SHIFT; 688 pad->strength &= PMIC_GPIO_REG_OUT_STRENGTH_MASK; 689 690 pad->buffer_type = val >> PMIC_GPIO_REG_OUT_TYPE_SHIFT; 691 pad->buffer_type &= PMIC_GPIO_REG_OUT_TYPE_MASK; 692 693 /* Pin could be disabled with PIN_CONFIG_BIAS_HIGH_IMPEDANCE */ 694 pad->is_enabled = true; 695 return 0; 696} 697 698static int pmic_gpio_probe(struct platform_device *pdev) 699{ 700 struct device *dev = &pdev->dev; 701 struct pinctrl_pin_desc *pindesc; 702 struct pinctrl_desc *pctrldesc; 703 struct pmic_gpio_pad *pad, *pads; 704 struct pmic_gpio_state *state; 705 int ret, npins, i; 706 u32 res[2]; 707 708 ret = of_property_read_u32_array(dev->of_node, "reg", res, 2); 709 if (ret < 0) { 710 dev_err(dev, "missing base address and/or range"); 711 return ret; 712 } 713 714 npins = res[1] / PMIC_GPIO_ADDRESS_RANGE; 715 716 if (!npins) 717 return -EINVAL; 718 719 BUG_ON(npins > ARRAY_SIZE(pmic_gpio_groups)); 720 721 state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL); 722 if (!state) 723 return -ENOMEM; 724 725 platform_set_drvdata(pdev, state); 726 727 state->dev = &pdev->dev; 728 state->map = dev_get_regmap(dev->parent, NULL); 729 730 pindesc = devm_kcalloc(dev, npins, sizeof(*pindesc), GFP_KERNEL); 731 if (!pindesc) 732 return -ENOMEM; 733 734 pads = devm_kcalloc(dev, npins, sizeof(*pads), GFP_KERNEL); 735 if (!pads) 736 return -ENOMEM; 737 738 pctrldesc = devm_kzalloc(dev, sizeof(*pctrldesc), GFP_KERNEL); 739 if (!pctrldesc) 740 return -ENOMEM; 741 742 pctrldesc->pctlops = &pmic_gpio_pinctrl_ops; 743 pctrldesc->pmxops = &pmic_gpio_pinmux_ops; 744 pctrldesc->confops = &pmic_gpio_pinconf_ops; 745 pctrldesc->owner = THIS_MODULE; 746 pctrldesc->name = dev_name(dev); 747 pctrldesc->pins = pindesc; 748 pctrldesc->npins = npins; 749 pctrldesc->num_custom_params = ARRAY_SIZE(pmic_gpio_bindings); 750 pctrldesc->custom_params = pmic_gpio_bindings; 751#ifdef CONFIG_DEBUG_FS 752 pctrldesc->custom_conf_items = pmic_conf_items; 753#endif 754 755 for (i = 0; i < npins; i++, pindesc++) { 756 pad = &pads[i]; 757 pindesc->drv_data = pad; 758 pindesc->number = i; 759 pindesc->name = pmic_gpio_groups[i]; 760 761 pad->irq = platform_get_irq(pdev, i); 762 if (pad->irq < 0) 763 return pad->irq; 764 765 pad->base = res[0] + i * PMIC_GPIO_ADDRESS_RANGE; 766 767 ret = pmic_gpio_populate(state, pad); 768 if (ret < 0) 769 return ret; 770 } 771 772 state->chip = pmic_gpio_gpio_template; 773 state->chip.dev = dev; 774 state->chip.base = -1; 775 state->chip.ngpio = npins; 776 state->chip.label = dev_name(dev); 777 state->chip.of_gpio_n_cells = 2; 778 state->chip.can_sleep = false; 779 780 state->ctrl = pinctrl_register(pctrldesc, dev, state); 781 if (!state->ctrl) 782 return -ENODEV; 783 784 ret = gpiochip_add(&state->chip); 785 if (ret) { 786 dev_err(state->dev, "can't add gpio chip\n"); 787 goto err_chip; 788 } 789 790 ret = gpiochip_add_pin_range(&state->chip, dev_name(dev), 0, 0, npins); 791 if (ret) { 792 dev_err(dev, "failed to add pin range\n"); 793 goto err_range; 794 } 795 796 return 0; 797 798err_range: 799 gpiochip_remove(&state->chip); 800err_chip: 801 pinctrl_unregister(state->ctrl); 802 return ret; 803} 804 805static int pmic_gpio_remove(struct platform_device *pdev) 806{ 807 struct pmic_gpio_state *state = platform_get_drvdata(pdev); 808 809 gpiochip_remove(&state->chip); 810 pinctrl_unregister(state->ctrl); 811 return 0; 812} 813 814static const struct of_device_id pmic_gpio_of_match[] = { 815 { .compatible = "qcom,pm8916-gpio" }, /* 4 GPIO's */ 816 { .compatible = "qcom,pm8941-gpio" }, /* 36 GPIO's */ 817 { .compatible = "qcom,pma8084-gpio" }, /* 22 GPIO's */ 818 { }, 819}; 820 821MODULE_DEVICE_TABLE(of, pmic_gpio_of_match); 822 823static struct platform_driver pmic_gpio_driver = { 824 .driver = { 825 .name = "qcom-spmi-gpio", 826 .of_match_table = pmic_gpio_of_match, 827 }, 828 .probe = pmic_gpio_probe, 829 .remove = pmic_gpio_remove, 830}; 831 832module_platform_driver(pmic_gpio_driver); 833 834MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>"); 835MODULE_DESCRIPTION("Qualcomm SPMI PMIC GPIO pin control driver"); 836MODULE_ALIAS("platform:qcom-spmi-gpio"); 837MODULE_LICENSE("GPL v2"); 838