1 /* 2 * Copyright (C) 2012 Samsung Electronics Co.Ltd 3 * Author: Joonyoung Shim <jy0922.shim@samsung.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 */ 9 10 #include <linux/module.h> 11 #include <linux/delay.h> 12 #include <linux/of.h> 13 #include <linux/i2c.h> 14 #include <linux/i2c/mms114.h> 15 #include <linux/input/mt.h> 16 #include <linux/interrupt.h> 17 #include <linux/regulator/consumer.h> 18 #include <linux/slab.h> 19 20 /* Write only registers */ 21 #define MMS114_MODE_CONTROL 0x01 22 #define MMS114_OPERATION_MODE_MASK 0xE 23 #define MMS114_ACTIVE (1 << 1) 24 25 #define MMS114_XY_RESOLUTION_H 0x02 26 #define MMS114_X_RESOLUTION 0x03 27 #define MMS114_Y_RESOLUTION 0x04 28 #define MMS114_CONTACT_THRESHOLD 0x05 29 #define MMS114_MOVING_THRESHOLD 0x06 30 31 /* Read only registers */ 32 #define MMS114_PACKET_SIZE 0x0F 33 #define MMS114_INFOMATION 0x10 34 #define MMS114_TSP_REV 0xF0 35 36 /* Minimum delay time is 50us between stop and start signal of i2c */ 37 #define MMS114_I2C_DELAY 50 38 39 /* 200ms needs after power on */ 40 #define MMS114_POWERON_DELAY 200 41 42 /* Touchscreen absolute values */ 43 #define MMS114_MAX_AREA 0xff 44 45 #define MMS114_MAX_TOUCH 10 46 #define MMS114_PACKET_NUM 8 47 48 /* Touch type */ 49 #define MMS114_TYPE_NONE 0 50 #define MMS114_TYPE_TOUCHSCREEN 1 51 #define MMS114_TYPE_TOUCHKEY 2 52 53 struct mms114_data { 54 struct i2c_client *client; 55 struct input_dev *input_dev; 56 struct regulator *core_reg; 57 struct regulator *io_reg; 58 const struct mms114_platform_data *pdata; 59 60 /* Use cache data for mode control register(write only) */ 61 u8 cache_mode_control; 62 }; 63 64 struct mms114_touch { 65 u8 id:4, reserved_bit4:1, type:2, pressed:1; 66 u8 x_hi:4, y_hi:4; 67 u8 x_lo; 68 u8 y_lo; 69 u8 width; 70 u8 strength; 71 u8 reserved[2]; 72 } __packed; 73 74 static int __mms114_read_reg(struct mms114_data *data, unsigned int reg, 75 unsigned int len, u8 *val) 76 { 77 struct i2c_client *client = data->client; 78 struct i2c_msg xfer[2]; 79 u8 buf = reg & 0xff; 80 int error; 81 82 if (reg <= MMS114_MODE_CONTROL && reg + len > MMS114_MODE_CONTROL) 83 BUG(); 84 85 /* Write register: use repeated start */ 86 xfer[0].addr = client->addr; 87 xfer[0].flags = I2C_M_TEN | I2C_M_NOSTART; 88 xfer[0].len = 1; 89 xfer[0].buf = &buf; 90 91 /* Read data */ 92 xfer[1].addr = client->addr; 93 xfer[1].flags = I2C_M_RD; 94 xfer[1].len = len; 95 xfer[1].buf = val; 96 97 error = i2c_transfer(client->adapter, xfer, 2); 98 if (error != 2) { 99 dev_err(&client->dev, 100 "%s: i2c transfer failed (%d)\n", __func__, error); 101 return error < 0 ? error : -EIO; 102 } 103 udelay(MMS114_I2C_DELAY); 104 105 return 0; 106 } 107 108 static int mms114_read_reg(struct mms114_data *data, unsigned int reg) 109 { 110 u8 val; 111 int error; 112 113 if (reg == MMS114_MODE_CONTROL) 114 return data->cache_mode_control; 115 116 error = __mms114_read_reg(data, reg, 1, &val); 117 return error < 0 ? error : val; 118 } 119 120 static int mms114_write_reg(struct mms114_data *data, unsigned int reg, 121 unsigned int val) 122 { 123 struct i2c_client *client = data->client; 124 u8 buf[2]; 125 int error; 126 127 buf[0] = reg & 0xff; 128 buf[1] = val & 0xff; 129 130 error = i2c_master_send(client, buf, 2); 131 if (error != 2) { 132 dev_err(&client->dev, 133 "%s: i2c send failed (%d)\n", __func__, error); 134 return error < 0 ? error : -EIO; 135 } 136 udelay(MMS114_I2C_DELAY); 137 138 if (reg == MMS114_MODE_CONTROL) 139 data->cache_mode_control = val; 140 141 return 0; 142 } 143 144 static void mms114_process_mt(struct mms114_data *data, struct mms114_touch *touch) 145 { 146 const struct mms114_platform_data *pdata = data->pdata; 147 struct i2c_client *client = data->client; 148 struct input_dev *input_dev = data->input_dev; 149 unsigned int id; 150 unsigned int x; 151 unsigned int y; 152 153 if (touch->id > MMS114_MAX_TOUCH) { 154 dev_err(&client->dev, "Wrong touch id (%d)\n", touch->id); 155 return; 156 } 157 158 if (touch->type != MMS114_TYPE_TOUCHSCREEN) { 159 dev_err(&client->dev, "Wrong touch type (%d)\n", touch->type); 160 return; 161 } 162 163 id = touch->id - 1; 164 x = touch->x_lo | touch->x_hi << 8; 165 y = touch->y_lo | touch->y_hi << 8; 166 if (x > pdata->x_size || y > pdata->y_size) { 167 dev_dbg(&client->dev, 168 "Wrong touch coordinates (%d, %d)\n", x, y); 169 return; 170 } 171 172 if (pdata->x_invert) 173 x = pdata->x_size - x; 174 if (pdata->y_invert) 175 y = pdata->y_size - y; 176 177 dev_dbg(&client->dev, 178 "id: %d, type: %d, pressed: %d, x: %d, y: %d, width: %d, strength: %d\n", 179 id, touch->type, touch->pressed, 180 x, y, touch->width, touch->strength); 181 182 input_mt_slot(input_dev, id); 183 input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, touch->pressed); 184 185 if (touch->pressed) { 186 input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, touch->width); 187 input_report_abs(input_dev, ABS_MT_POSITION_X, x); 188 input_report_abs(input_dev, ABS_MT_POSITION_Y, y); 189 input_report_abs(input_dev, ABS_MT_PRESSURE, touch->strength); 190 } 191 } 192 193 static irqreturn_t mms114_interrupt(int irq, void *dev_id) 194 { 195 struct mms114_data *data = dev_id; 196 struct input_dev *input_dev = data->input_dev; 197 struct mms114_touch touch[MMS114_MAX_TOUCH]; 198 int packet_size; 199 int touch_size; 200 int index; 201 int error; 202 203 mutex_lock(&input_dev->mutex); 204 if (!input_dev->users) { 205 mutex_unlock(&input_dev->mutex); 206 goto out; 207 } 208 mutex_unlock(&input_dev->mutex); 209 210 packet_size = mms114_read_reg(data, MMS114_PACKET_SIZE); 211 if (packet_size <= 0) 212 goto out; 213 214 touch_size = packet_size / MMS114_PACKET_NUM; 215 216 error = __mms114_read_reg(data, MMS114_INFOMATION, packet_size, 217 (u8 *)touch); 218 if (error < 0) 219 goto out; 220 221 for (index = 0; index < touch_size; index++) 222 mms114_process_mt(data, touch + index); 223 224 input_mt_report_pointer_emulation(data->input_dev, true); 225 input_sync(data->input_dev); 226 227 out: 228 return IRQ_HANDLED; 229 } 230 231 static int mms114_set_active(struct mms114_data *data, bool active) 232 { 233 int val; 234 235 val = mms114_read_reg(data, MMS114_MODE_CONTROL); 236 if (val < 0) 237 return val; 238 239 val &= ~MMS114_OPERATION_MODE_MASK; 240 241 /* If active is false, sleep mode */ 242 if (active) 243 val |= MMS114_ACTIVE; 244 245 return mms114_write_reg(data, MMS114_MODE_CONTROL, val); 246 } 247 248 static int mms114_get_version(struct mms114_data *data) 249 { 250 struct device *dev = &data->client->dev; 251 u8 buf[6]; 252 int error; 253 254 error = __mms114_read_reg(data, MMS114_TSP_REV, 6, buf); 255 if (error < 0) 256 return error; 257 258 dev_info(dev, "TSP Rev: 0x%x, HW Rev: 0x%x, Firmware Ver: 0x%x\n", 259 buf[0], buf[1], buf[3]); 260 261 return 0; 262 } 263 264 static int mms114_setup_regs(struct mms114_data *data) 265 { 266 const struct mms114_platform_data *pdata = data->pdata; 267 int val; 268 int error; 269 270 error = mms114_get_version(data); 271 if (error < 0) 272 return error; 273 274 error = mms114_set_active(data, true); 275 if (error < 0) 276 return error; 277 278 val = (pdata->x_size >> 8) & 0xf; 279 val |= ((pdata->y_size >> 8) & 0xf) << 4; 280 error = mms114_write_reg(data, MMS114_XY_RESOLUTION_H, val); 281 if (error < 0) 282 return error; 283 284 val = pdata->x_size & 0xff; 285 error = mms114_write_reg(data, MMS114_X_RESOLUTION, val); 286 if (error < 0) 287 return error; 288 289 val = pdata->y_size & 0xff; 290 error = mms114_write_reg(data, MMS114_Y_RESOLUTION, val); 291 if (error < 0) 292 return error; 293 294 if (pdata->contact_threshold) { 295 error = mms114_write_reg(data, MMS114_CONTACT_THRESHOLD, 296 pdata->contact_threshold); 297 if (error < 0) 298 return error; 299 } 300 301 if (pdata->moving_threshold) { 302 error = mms114_write_reg(data, MMS114_MOVING_THRESHOLD, 303 pdata->moving_threshold); 304 if (error < 0) 305 return error; 306 } 307 308 return 0; 309 } 310 311 static int mms114_start(struct mms114_data *data) 312 { 313 struct i2c_client *client = data->client; 314 int error; 315 316 error = regulator_enable(data->core_reg); 317 if (error) { 318 dev_err(&client->dev, "Failed to enable avdd: %d\n", error); 319 return error; 320 } 321 322 error = regulator_enable(data->io_reg); 323 if (error) { 324 dev_err(&client->dev, "Failed to enable vdd: %d\n", error); 325 regulator_disable(data->core_reg); 326 return error; 327 } 328 329 mdelay(MMS114_POWERON_DELAY); 330 331 error = mms114_setup_regs(data); 332 if (error < 0) { 333 regulator_disable(data->io_reg); 334 regulator_disable(data->core_reg); 335 return error; 336 } 337 338 if (data->pdata->cfg_pin) 339 data->pdata->cfg_pin(true); 340 341 enable_irq(client->irq); 342 343 return 0; 344 } 345 346 static void mms114_stop(struct mms114_data *data) 347 { 348 struct i2c_client *client = data->client; 349 int error; 350 351 disable_irq(client->irq); 352 353 if (data->pdata->cfg_pin) 354 data->pdata->cfg_pin(false); 355 356 error = regulator_disable(data->io_reg); 357 if (error) 358 dev_warn(&client->dev, "Failed to disable vdd: %d\n", error); 359 360 error = regulator_disable(data->core_reg); 361 if (error) 362 dev_warn(&client->dev, "Failed to disable avdd: %d\n", error); 363 } 364 365 static int mms114_input_open(struct input_dev *dev) 366 { 367 struct mms114_data *data = input_get_drvdata(dev); 368 369 return mms114_start(data); 370 } 371 372 static void mms114_input_close(struct input_dev *dev) 373 { 374 struct mms114_data *data = input_get_drvdata(dev); 375 376 mms114_stop(data); 377 } 378 379 #ifdef CONFIG_OF 380 static struct mms114_platform_data *mms114_parse_dt(struct device *dev) 381 { 382 struct mms114_platform_data *pdata; 383 struct device_node *np = dev->of_node; 384 385 if (!np) 386 return NULL; 387 388 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 389 if (!pdata) { 390 dev_err(dev, "failed to allocate platform data\n"); 391 return NULL; 392 } 393 394 if (of_property_read_u32(np, "x-size", &pdata->x_size)) { 395 dev_err(dev, "failed to get x-size property\n"); 396 return NULL; 397 }; 398 399 if (of_property_read_u32(np, "y-size", &pdata->y_size)) { 400 dev_err(dev, "failed to get y-size property\n"); 401 return NULL; 402 }; 403 404 of_property_read_u32(np, "contact-threshold", 405 &pdata->contact_threshold); 406 of_property_read_u32(np, "moving-threshold", 407 &pdata->moving_threshold); 408 409 if (of_find_property(np, "x-invert", NULL)) 410 pdata->x_invert = true; 411 if (of_find_property(np, "y-invert", NULL)) 412 pdata->y_invert = true; 413 414 return pdata; 415 } 416 #else 417 static inline struct mms114_platform_data *mms114_parse_dt(struct device *dev) 418 { 419 return NULL; 420 } 421 #endif 422 423 static int mms114_probe(struct i2c_client *client, 424 const struct i2c_device_id *id) 425 { 426 const struct mms114_platform_data *pdata; 427 struct mms114_data *data; 428 struct input_dev *input_dev; 429 int error; 430 431 pdata = dev_get_platdata(&client->dev); 432 if (!pdata) 433 pdata = mms114_parse_dt(&client->dev); 434 435 if (!pdata) { 436 dev_err(&client->dev, "Need platform data\n"); 437 return -EINVAL; 438 } 439 440 if (!i2c_check_functionality(client->adapter, 441 I2C_FUNC_PROTOCOL_MANGLING)) { 442 dev_err(&client->dev, 443 "Need i2c bus that supports protocol mangling\n"); 444 return -ENODEV; 445 } 446 447 data = devm_kzalloc(&client->dev, sizeof(struct mms114_data), 448 GFP_KERNEL); 449 input_dev = devm_input_allocate_device(&client->dev); 450 if (!data || !input_dev) { 451 dev_err(&client->dev, "Failed to allocate memory\n"); 452 return -ENOMEM; 453 } 454 455 data->client = client; 456 data->input_dev = input_dev; 457 data->pdata = pdata; 458 459 input_dev->name = "MELFAS MMS114 Touchscreen"; 460 input_dev->id.bustype = BUS_I2C; 461 input_dev->dev.parent = &client->dev; 462 input_dev->open = mms114_input_open; 463 input_dev->close = mms114_input_close; 464 465 __set_bit(EV_ABS, input_dev->evbit); 466 __set_bit(EV_KEY, input_dev->evbit); 467 __set_bit(BTN_TOUCH, input_dev->keybit); 468 input_set_abs_params(input_dev, ABS_X, 0, data->pdata->x_size, 0, 0); 469 input_set_abs_params(input_dev, ABS_Y, 0, data->pdata->y_size, 0, 0); 470 471 /* For multi touch */ 472 input_mt_init_slots(input_dev, MMS114_MAX_TOUCH, 0); 473 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 474 0, MMS114_MAX_AREA, 0, 0); 475 input_set_abs_params(input_dev, ABS_MT_POSITION_X, 476 0, data->pdata->x_size, 0, 0); 477 input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 478 0, data->pdata->y_size, 0, 0); 479 input_set_abs_params(input_dev, ABS_MT_PRESSURE, 0, 255, 0, 0); 480 481 input_set_drvdata(input_dev, data); 482 i2c_set_clientdata(client, data); 483 484 data->core_reg = devm_regulator_get(&client->dev, "avdd"); 485 if (IS_ERR(data->core_reg)) { 486 error = PTR_ERR(data->core_reg); 487 dev_err(&client->dev, 488 "Unable to get the Core regulator (%d)\n", error); 489 return error; 490 } 491 492 data->io_reg = devm_regulator_get(&client->dev, "vdd"); 493 if (IS_ERR(data->io_reg)) { 494 error = PTR_ERR(data->io_reg); 495 dev_err(&client->dev, 496 "Unable to get the IO regulator (%d)\n", error); 497 return error; 498 } 499 500 error = devm_request_threaded_irq(&client->dev, client->irq, NULL, 501 mms114_interrupt, IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 502 dev_name(&client->dev), data); 503 if (error) { 504 dev_err(&client->dev, "Failed to register interrupt\n"); 505 return error; 506 } 507 disable_irq(client->irq); 508 509 error = input_register_device(data->input_dev); 510 if (error) { 511 dev_err(&client->dev, "Failed to register input device\n"); 512 return error; 513 } 514 515 return 0; 516 } 517 518 static int __maybe_unused mms114_suspend(struct device *dev) 519 { 520 struct i2c_client *client = to_i2c_client(dev); 521 struct mms114_data *data = i2c_get_clientdata(client); 522 struct input_dev *input_dev = data->input_dev; 523 int id; 524 525 /* Release all touch */ 526 for (id = 0; id < MMS114_MAX_TOUCH; id++) { 527 input_mt_slot(input_dev, id); 528 input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, false); 529 } 530 531 input_mt_report_pointer_emulation(input_dev, true); 532 input_sync(input_dev); 533 534 mutex_lock(&input_dev->mutex); 535 if (input_dev->users) 536 mms114_stop(data); 537 mutex_unlock(&input_dev->mutex); 538 539 return 0; 540 } 541 542 static int __maybe_unused mms114_resume(struct device *dev) 543 { 544 struct i2c_client *client = to_i2c_client(dev); 545 struct mms114_data *data = i2c_get_clientdata(client); 546 struct input_dev *input_dev = data->input_dev; 547 int error; 548 549 mutex_lock(&input_dev->mutex); 550 if (input_dev->users) { 551 error = mms114_start(data); 552 if (error < 0) { 553 mutex_unlock(&input_dev->mutex); 554 return error; 555 } 556 } 557 mutex_unlock(&input_dev->mutex); 558 559 return 0; 560 } 561 562 static SIMPLE_DEV_PM_OPS(mms114_pm_ops, mms114_suspend, mms114_resume); 563 564 static const struct i2c_device_id mms114_id[] = { 565 { "mms114", 0 }, 566 { } 567 }; 568 MODULE_DEVICE_TABLE(i2c, mms114_id); 569 570 #ifdef CONFIG_OF 571 static const struct of_device_id mms114_dt_match[] = { 572 { .compatible = "melfas,mms114" }, 573 { } 574 }; 575 #endif 576 577 static struct i2c_driver mms114_driver = { 578 .driver = { 579 .name = "mms114", 580 .owner = THIS_MODULE, 581 .pm = &mms114_pm_ops, 582 .of_match_table = of_match_ptr(mms114_dt_match), 583 }, 584 .probe = mms114_probe, 585 .id_table = mms114_id, 586 }; 587 588 module_i2c_driver(mms114_driver); 589 590 /* Module information */ 591 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); 592 MODULE_DESCRIPTION("MELFAS mms114 Touchscreen driver"); 593 MODULE_LICENSE("GPL"); 594