1 /* 2 * lm3533-core.c -- LM3533 Core 3 * 4 * Copyright (C) 2011-2012 Texas Instruments 5 * 6 * Author: Johan Hovold <jhovold@gmail.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/init.h> 16 #include <linux/kernel.h> 17 #include <linux/err.h> 18 #include <linux/gpio.h> 19 #include <linux/i2c.h> 20 #include <linux/mfd/core.h> 21 #include <linux/regmap.h> 22 #include <linux/seq_file.h> 23 #include <linux/slab.h> 24 #include <linux/uaccess.h> 25 26 #include <linux/mfd/lm3533.h> 27 28 29 #define LM3533_BOOST_OVP_MASK 0x06 30 #define LM3533_BOOST_OVP_SHIFT 1 31 32 #define LM3533_BOOST_FREQ_MASK 0x01 33 #define LM3533_BOOST_FREQ_SHIFT 0 34 35 #define LM3533_BL_ID_MASK 1 36 #define LM3533_LED_ID_MASK 3 37 #define LM3533_BL_ID_MAX 1 38 #define LM3533_LED_ID_MAX 3 39 40 #define LM3533_HVLED_ID_MAX 2 41 #define LM3533_LVLED_ID_MAX 5 42 43 #define LM3533_REG_OUTPUT_CONF1 0x10 44 #define LM3533_REG_OUTPUT_CONF2 0x11 45 #define LM3533_REG_BOOST_PWM 0x2c 46 47 #define LM3533_REG_MAX 0xb2 48 49 50 static struct mfd_cell lm3533_als_devs[] = { 51 { 52 .name = "lm3533-als", 53 .id = -1, 54 }, 55 }; 56 57 static struct mfd_cell lm3533_bl_devs[] = { 58 { 59 .name = "lm3533-backlight", 60 .id = 0, 61 }, 62 { 63 .name = "lm3533-backlight", 64 .id = 1, 65 }, 66 }; 67 68 static struct mfd_cell lm3533_led_devs[] = { 69 { 70 .name = "lm3533-leds", 71 .id = 0, 72 }, 73 { 74 .name = "lm3533-leds", 75 .id = 1, 76 }, 77 { 78 .name = "lm3533-leds", 79 .id = 2, 80 }, 81 { 82 .name = "lm3533-leds", 83 .id = 3, 84 }, 85 }; 86 87 int lm3533_read(struct lm3533 *lm3533, u8 reg, u8 *val) 88 { 89 int tmp; 90 int ret; 91 92 ret = regmap_read(lm3533->regmap, reg, &tmp); 93 if (ret < 0) { 94 dev_err(lm3533->dev, "failed to read register %02x: %d\n", 95 reg, ret); 96 return ret; 97 } 98 99 *val = tmp; 100 101 dev_dbg(lm3533->dev, "read [%02x]: %02x\n", reg, *val); 102 103 return ret; 104 } 105 EXPORT_SYMBOL_GPL(lm3533_read); 106 107 int lm3533_write(struct lm3533 *lm3533, u8 reg, u8 val) 108 { 109 int ret; 110 111 dev_dbg(lm3533->dev, "write [%02x]: %02x\n", reg, val); 112 113 ret = regmap_write(lm3533->regmap, reg, val); 114 if (ret < 0) { 115 dev_err(lm3533->dev, "failed to write register %02x: %d\n", 116 reg, ret); 117 } 118 119 return ret; 120 } 121 EXPORT_SYMBOL_GPL(lm3533_write); 122 123 int lm3533_update(struct lm3533 *lm3533, u8 reg, u8 val, u8 mask) 124 { 125 int ret; 126 127 dev_dbg(lm3533->dev, "update [%02x]: %02x/%02x\n", reg, val, mask); 128 129 ret = regmap_update_bits(lm3533->regmap, reg, mask, val); 130 if (ret < 0) { 131 dev_err(lm3533->dev, "failed to update register %02x: %d\n", 132 reg, ret); 133 } 134 135 return ret; 136 } 137 EXPORT_SYMBOL_GPL(lm3533_update); 138 139 static int lm3533_set_boost_freq(struct lm3533 *lm3533, 140 enum lm3533_boost_freq freq) 141 { 142 int ret; 143 144 ret = lm3533_update(lm3533, LM3533_REG_BOOST_PWM, 145 freq << LM3533_BOOST_FREQ_SHIFT, 146 LM3533_BOOST_FREQ_MASK); 147 if (ret) 148 dev_err(lm3533->dev, "failed to set boost frequency\n"); 149 150 return ret; 151 } 152 153 154 static int lm3533_set_boost_ovp(struct lm3533 *lm3533, 155 enum lm3533_boost_ovp ovp) 156 { 157 int ret; 158 159 ret = lm3533_update(lm3533, LM3533_REG_BOOST_PWM, 160 ovp << LM3533_BOOST_OVP_SHIFT, 161 LM3533_BOOST_OVP_MASK); 162 if (ret) 163 dev_err(lm3533->dev, "failed to set boost ovp\n"); 164 165 return ret; 166 } 167 168 /* 169 * HVLED output config -- output hvled controlled by backlight bl 170 */ 171 static int lm3533_set_hvled_config(struct lm3533 *lm3533, u8 hvled, u8 bl) 172 { 173 u8 val; 174 u8 mask; 175 int shift; 176 int ret; 177 178 if (hvled == 0 || hvled > LM3533_HVLED_ID_MAX) 179 return -EINVAL; 180 181 if (bl > LM3533_BL_ID_MAX) 182 return -EINVAL; 183 184 shift = hvled - 1; 185 mask = LM3533_BL_ID_MASK << shift; 186 val = bl << shift; 187 188 ret = lm3533_update(lm3533, LM3533_REG_OUTPUT_CONF1, val, mask); 189 if (ret) 190 dev_err(lm3533->dev, "failed to set hvled config\n"); 191 192 return ret; 193 } 194 195 /* 196 * LVLED output config -- output lvled controlled by LED led 197 */ 198 static int lm3533_set_lvled_config(struct lm3533 *lm3533, u8 lvled, u8 led) 199 { 200 u8 reg; 201 u8 val; 202 u8 mask; 203 int shift; 204 int ret; 205 206 if (lvled == 0 || lvled > LM3533_LVLED_ID_MAX) 207 return -EINVAL; 208 209 if (led > LM3533_LED_ID_MAX) 210 return -EINVAL; 211 212 if (lvled < 4) { 213 reg = LM3533_REG_OUTPUT_CONF1; 214 shift = 2 * lvled; 215 } else { 216 reg = LM3533_REG_OUTPUT_CONF2; 217 shift = 2 * (lvled - 4); 218 } 219 220 mask = LM3533_LED_ID_MASK << shift; 221 val = led << shift; 222 223 ret = lm3533_update(lm3533, reg, val, mask); 224 if (ret) 225 dev_err(lm3533->dev, "failed to set lvled config\n"); 226 227 return ret; 228 } 229 230 static void lm3533_enable(struct lm3533 *lm3533) 231 { 232 if (gpio_is_valid(lm3533->gpio_hwen)) 233 gpio_set_value(lm3533->gpio_hwen, 1); 234 } 235 236 static void lm3533_disable(struct lm3533 *lm3533) 237 { 238 if (gpio_is_valid(lm3533->gpio_hwen)) 239 gpio_set_value(lm3533->gpio_hwen, 0); 240 } 241 242 enum lm3533_attribute_type { 243 LM3533_ATTR_TYPE_BACKLIGHT, 244 LM3533_ATTR_TYPE_LED, 245 }; 246 247 struct lm3533_device_attribute { 248 struct device_attribute dev_attr; 249 enum lm3533_attribute_type type; 250 union { 251 struct { 252 u8 id; 253 } output; 254 } u; 255 }; 256 257 #define to_lm3533_dev_attr(_attr) \ 258 container_of(_attr, struct lm3533_device_attribute, dev_attr) 259 260 static ssize_t show_output(struct device *dev, 261 struct device_attribute *attr, char *buf) 262 { 263 struct lm3533 *lm3533 = dev_get_drvdata(dev); 264 struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(attr); 265 int id = lattr->u.output.id; 266 u8 reg; 267 u8 val; 268 u8 mask; 269 int shift; 270 int ret; 271 272 if (lattr->type == LM3533_ATTR_TYPE_BACKLIGHT) { 273 reg = LM3533_REG_OUTPUT_CONF1; 274 shift = id - 1; 275 mask = LM3533_BL_ID_MASK << shift; 276 } else { 277 if (id < 4) { 278 reg = LM3533_REG_OUTPUT_CONF1; 279 shift = 2 * id; 280 } else { 281 reg = LM3533_REG_OUTPUT_CONF2; 282 shift = 2 * (id - 4); 283 } 284 mask = LM3533_LED_ID_MASK << shift; 285 } 286 287 ret = lm3533_read(lm3533, reg, &val); 288 if (ret) 289 return ret; 290 291 val = (val & mask) >> shift; 292 293 return scnprintf(buf, PAGE_SIZE, "%u\n", val); 294 } 295 296 static ssize_t store_output(struct device *dev, 297 struct device_attribute *attr, 298 const char *buf, size_t len) 299 { 300 struct lm3533 *lm3533 = dev_get_drvdata(dev); 301 struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(attr); 302 int id = lattr->u.output.id; 303 u8 val; 304 int ret; 305 306 if (kstrtou8(buf, 0, &val)) 307 return -EINVAL; 308 309 if (lattr->type == LM3533_ATTR_TYPE_BACKLIGHT) 310 ret = lm3533_set_hvled_config(lm3533, id, val); 311 else 312 ret = lm3533_set_lvled_config(lm3533, id, val); 313 314 if (ret) 315 return ret; 316 317 return len; 318 } 319 320 #define LM3533_OUTPUT_ATTR(_name, _mode, _show, _store, _type, _id) \ 321 struct lm3533_device_attribute lm3533_dev_attr_##_name = \ 322 { .dev_attr = __ATTR(_name, _mode, _show, _store), \ 323 .type = _type, \ 324 .u.output = { .id = _id }, } 325 326 #define LM3533_OUTPUT_ATTR_RW(_name, _type, _id) \ 327 LM3533_OUTPUT_ATTR(output_##_name, S_IRUGO | S_IWUSR, \ 328 show_output, store_output, _type, _id) 329 330 #define LM3533_OUTPUT_HVLED_ATTR_RW(_nr) \ 331 LM3533_OUTPUT_ATTR_RW(hvled##_nr, LM3533_ATTR_TYPE_BACKLIGHT, _nr) 332 #define LM3533_OUTPUT_LVLED_ATTR_RW(_nr) \ 333 LM3533_OUTPUT_ATTR_RW(lvled##_nr, LM3533_ATTR_TYPE_LED, _nr) 334 /* 335 * Output config: 336 * 337 * output_hvled<nr> 0-1 338 * output_lvled<nr> 0-3 339 */ 340 static LM3533_OUTPUT_HVLED_ATTR_RW(1); 341 static LM3533_OUTPUT_HVLED_ATTR_RW(2); 342 static LM3533_OUTPUT_LVLED_ATTR_RW(1); 343 static LM3533_OUTPUT_LVLED_ATTR_RW(2); 344 static LM3533_OUTPUT_LVLED_ATTR_RW(3); 345 static LM3533_OUTPUT_LVLED_ATTR_RW(4); 346 static LM3533_OUTPUT_LVLED_ATTR_RW(5); 347 348 static struct attribute *lm3533_attributes[] = { 349 &lm3533_dev_attr_output_hvled1.dev_attr.attr, 350 &lm3533_dev_attr_output_hvled2.dev_attr.attr, 351 &lm3533_dev_attr_output_lvled1.dev_attr.attr, 352 &lm3533_dev_attr_output_lvled2.dev_attr.attr, 353 &lm3533_dev_attr_output_lvled3.dev_attr.attr, 354 &lm3533_dev_attr_output_lvled4.dev_attr.attr, 355 &lm3533_dev_attr_output_lvled5.dev_attr.attr, 356 NULL, 357 }; 358 359 #define to_dev_attr(_attr) \ 360 container_of(_attr, struct device_attribute, attr) 361 362 static umode_t lm3533_attr_is_visible(struct kobject *kobj, 363 struct attribute *attr, int n) 364 { 365 struct device *dev = container_of(kobj, struct device, kobj); 366 struct lm3533 *lm3533 = dev_get_drvdata(dev); 367 struct device_attribute *dattr = to_dev_attr(attr); 368 struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(dattr); 369 enum lm3533_attribute_type type = lattr->type; 370 umode_t mode = attr->mode; 371 372 if (!lm3533->have_backlights && type == LM3533_ATTR_TYPE_BACKLIGHT) 373 mode = 0; 374 else if (!lm3533->have_leds && type == LM3533_ATTR_TYPE_LED) 375 mode = 0; 376 377 return mode; 378 }; 379 380 static struct attribute_group lm3533_attribute_group = { 381 .is_visible = lm3533_attr_is_visible, 382 .attrs = lm3533_attributes 383 }; 384 385 static int lm3533_device_als_init(struct lm3533 *lm3533) 386 { 387 struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev); 388 int ret; 389 390 if (!pdata->als) 391 return 0; 392 393 lm3533_als_devs[0].platform_data = pdata->als; 394 lm3533_als_devs[0].pdata_size = sizeof(*pdata->als); 395 396 ret = mfd_add_devices(lm3533->dev, 0, lm3533_als_devs, 1, NULL, 397 0, NULL); 398 if (ret) { 399 dev_err(lm3533->dev, "failed to add ALS device\n"); 400 return ret; 401 } 402 403 lm3533->have_als = 1; 404 405 return 0; 406 } 407 408 static int lm3533_device_bl_init(struct lm3533 *lm3533) 409 { 410 struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev); 411 int i; 412 int ret; 413 414 if (!pdata->backlights || pdata->num_backlights == 0) 415 return 0; 416 417 if (pdata->num_backlights > ARRAY_SIZE(lm3533_bl_devs)) 418 pdata->num_backlights = ARRAY_SIZE(lm3533_bl_devs); 419 420 for (i = 0; i < pdata->num_backlights; ++i) { 421 lm3533_bl_devs[i].platform_data = &pdata->backlights[i]; 422 lm3533_bl_devs[i].pdata_size = sizeof(pdata->backlights[i]); 423 } 424 425 ret = mfd_add_devices(lm3533->dev, 0, lm3533_bl_devs, 426 pdata->num_backlights, NULL, 0, NULL); 427 if (ret) { 428 dev_err(lm3533->dev, "failed to add backlight devices\n"); 429 return ret; 430 } 431 432 lm3533->have_backlights = 1; 433 434 return 0; 435 } 436 437 static int lm3533_device_led_init(struct lm3533 *lm3533) 438 { 439 struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev); 440 int i; 441 int ret; 442 443 if (!pdata->leds || pdata->num_leds == 0) 444 return 0; 445 446 if (pdata->num_leds > ARRAY_SIZE(lm3533_led_devs)) 447 pdata->num_leds = ARRAY_SIZE(lm3533_led_devs); 448 449 for (i = 0; i < pdata->num_leds; ++i) { 450 lm3533_led_devs[i].platform_data = &pdata->leds[i]; 451 lm3533_led_devs[i].pdata_size = sizeof(pdata->leds[i]); 452 } 453 454 ret = mfd_add_devices(lm3533->dev, 0, lm3533_led_devs, 455 pdata->num_leds, NULL, 0, NULL); 456 if (ret) { 457 dev_err(lm3533->dev, "failed to add LED devices\n"); 458 return ret; 459 } 460 461 lm3533->have_leds = 1; 462 463 return 0; 464 } 465 466 static int lm3533_device_setup(struct lm3533 *lm3533, 467 struct lm3533_platform_data *pdata) 468 { 469 int ret; 470 471 ret = lm3533_set_boost_freq(lm3533, pdata->boost_freq); 472 if (ret) 473 return ret; 474 475 return lm3533_set_boost_ovp(lm3533, pdata->boost_ovp); 476 } 477 478 static int lm3533_device_init(struct lm3533 *lm3533) 479 { 480 struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev); 481 int ret; 482 483 dev_dbg(lm3533->dev, "%s\n", __func__); 484 485 if (!pdata) { 486 dev_err(lm3533->dev, "no platform data\n"); 487 return -EINVAL; 488 } 489 490 lm3533->gpio_hwen = pdata->gpio_hwen; 491 492 dev_set_drvdata(lm3533->dev, lm3533); 493 494 if (gpio_is_valid(lm3533->gpio_hwen)) { 495 ret = devm_gpio_request_one(lm3533->dev, lm3533->gpio_hwen, 496 GPIOF_OUT_INIT_LOW, "lm3533-hwen"); 497 if (ret < 0) { 498 dev_err(lm3533->dev, 499 "failed to request HWEN GPIO %d\n", 500 lm3533->gpio_hwen); 501 return ret; 502 } 503 } 504 505 lm3533_enable(lm3533); 506 507 ret = lm3533_device_setup(lm3533, pdata); 508 if (ret) 509 goto err_disable; 510 511 lm3533_device_als_init(lm3533); 512 lm3533_device_bl_init(lm3533); 513 lm3533_device_led_init(lm3533); 514 515 ret = sysfs_create_group(&lm3533->dev->kobj, &lm3533_attribute_group); 516 if (ret < 0) { 517 dev_err(lm3533->dev, "failed to create sysfs attributes\n"); 518 goto err_unregister; 519 } 520 521 return 0; 522 523 err_unregister: 524 mfd_remove_devices(lm3533->dev); 525 err_disable: 526 lm3533_disable(lm3533); 527 528 return ret; 529 } 530 531 static void lm3533_device_exit(struct lm3533 *lm3533) 532 { 533 dev_dbg(lm3533->dev, "%s\n", __func__); 534 535 sysfs_remove_group(&lm3533->dev->kobj, &lm3533_attribute_group); 536 537 mfd_remove_devices(lm3533->dev); 538 lm3533_disable(lm3533); 539 } 540 541 static bool lm3533_readable_register(struct device *dev, unsigned int reg) 542 { 543 switch (reg) { 544 case 0x10 ... 0x2c: 545 case 0x30 ... 0x38: 546 case 0x40 ... 0x45: 547 case 0x50 ... 0x57: 548 case 0x60 ... 0x6e: 549 case 0x70 ... 0x75: 550 case 0x80 ... 0x85: 551 case 0x90 ... 0x95: 552 case 0xa0 ... 0xa5: 553 case 0xb0 ... 0xb2: 554 return true; 555 default: 556 return false; 557 } 558 } 559 560 static bool lm3533_volatile_register(struct device *dev, unsigned int reg) 561 { 562 switch (reg) { 563 case 0x34 ... 0x36: /* zone */ 564 case 0x37 ... 0x38: /* adc */ 565 case 0xb0 ... 0xb1: /* fault */ 566 return true; 567 default: 568 return false; 569 } 570 } 571 572 static bool lm3533_precious_register(struct device *dev, unsigned int reg) 573 { 574 switch (reg) { 575 case 0x34: /* zone */ 576 return true; 577 default: 578 return false; 579 } 580 } 581 582 static const struct regmap_config regmap_config = { 583 .reg_bits = 8, 584 .val_bits = 8, 585 .max_register = LM3533_REG_MAX, 586 .readable_reg = lm3533_readable_register, 587 .volatile_reg = lm3533_volatile_register, 588 .precious_reg = lm3533_precious_register, 589 }; 590 591 static int lm3533_i2c_probe(struct i2c_client *i2c, 592 const struct i2c_device_id *id) 593 { 594 struct lm3533 *lm3533; 595 596 dev_dbg(&i2c->dev, "%s\n", __func__); 597 598 lm3533 = devm_kzalloc(&i2c->dev, sizeof(*lm3533), GFP_KERNEL); 599 if (!lm3533) 600 return -ENOMEM; 601 602 i2c_set_clientdata(i2c, lm3533); 603 604 lm3533->regmap = devm_regmap_init_i2c(i2c, ®map_config); 605 if (IS_ERR(lm3533->regmap)) 606 return PTR_ERR(lm3533->regmap); 607 608 lm3533->dev = &i2c->dev; 609 lm3533->irq = i2c->irq; 610 611 return lm3533_device_init(lm3533); 612 } 613 614 static int lm3533_i2c_remove(struct i2c_client *i2c) 615 { 616 struct lm3533 *lm3533 = i2c_get_clientdata(i2c); 617 618 dev_dbg(&i2c->dev, "%s\n", __func__); 619 620 lm3533_device_exit(lm3533); 621 622 return 0; 623 } 624 625 static const struct i2c_device_id lm3533_i2c_ids[] = { 626 { "lm3533", 0 }, 627 { }, 628 }; 629 MODULE_DEVICE_TABLE(i2c, lm3533_i2c_ids); 630 631 static struct i2c_driver lm3533_i2c_driver = { 632 .driver = { 633 .name = "lm3533", 634 }, 635 .id_table = lm3533_i2c_ids, 636 .probe = lm3533_i2c_probe, 637 .remove = lm3533_i2c_remove, 638 }; 639 640 static int __init lm3533_i2c_init(void) 641 { 642 return i2c_add_driver(&lm3533_i2c_driver); 643 } 644 subsys_initcall(lm3533_i2c_init); 645 646 static void __exit lm3533_i2c_exit(void) 647 { 648 i2c_del_driver(&lm3533_i2c_driver); 649 } 650 module_exit(lm3533_i2c_exit); 651 652 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>"); 653 MODULE_DESCRIPTION("LM3533 Core"); 654 MODULE_LICENSE("GPL"); 655