drivers/input/touchscreen/goodix.c

   1 /*
   2  *  Driver for Goodix Touchscreens
   3  *
   4  *  Copyright (c) 2014 Red Hat Inc.
   5  *
   6  *  This code is based on gt9xx.c authored by andrew@goodix.com:
   7  *
   8  *  2010 - 2012 Goodix Technology.
   9  */
  10
  11 /*
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License as published by the Free
  14  * Software Foundation; version 2 of the License.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/dmi.h>
  19 #include <linux/i2c.h>
  20 #include <linux/input.h>
  21 #include <linux/input/mt.h>
  22 #include <linux/module.h>
  23 #include <linux/delay.h>
  24 #include <linux/irq.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/slab.h>
  27 #include <linux/acpi.h>
  28 #include <linux/of.h>
  29 #include <asm/unaligned.h>
  30
  31 struct goodix_ts_data {
  32         struct i2c_client *client;
  33         struct input_dev *input_dev;
  34         int abs_x_max;
  35         int abs_y_max;
  36         unsigned int max_touch_num;
  37         unsigned int int_trigger_type;
  38         bool rotated_screen;
  39 };
  40
  41 #define GOODIX_MAX_HEIGHT               4096
  42 #define GOODIX_MAX_WIDTH                4096
  43 #define GOODIX_INT_TRIGGER              1
  44 #define GOODIX_CONTACT_SIZE             8
  45 #define GOODIX_MAX_CONTACTS             10
  46
  47 #define GOODIX_CONFIG_MAX_LENGTH        240
  48
  49 /* Register defines */
  50 #define GOODIX_READ_COOR_ADDR           0x814E
  51 #define GOODIX_REG_CONFIG_DATA          0x8047
  52 #define GOODIX_REG_ID                   0x8140
  53
  54 #define RESOLUTION_LOC          1
  55 #define MAX_CONTACTS_LOC        5
  56 #define TRIGGER_LOC             6
  57
  58 static const unsigned long goodix_irq_flags[] = {
  59         IRQ_TYPE_EDGE_RISING,
  60         IRQ_TYPE_EDGE_FALLING,
  61         IRQ_TYPE_LEVEL_LOW,
  62         IRQ_TYPE_LEVEL_HIGH,
  63 };
  64
  65 /*
  66  * Those tablets have their coordinates origin at the bottom right
  67  * of the tablet, as if rotated 180 degrees
  68  */
  69 static const struct dmi_system_id rotated_screen[] = {
  70 #if defined(CONFIG_DMI) && defined(CONFIG_X86)
  71         {
  72                 .ident = "WinBook TW100",
  73                 .matches = {
  74                         DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
  75                         DMI_MATCH(DMI_PRODUCT_NAME, "TW100")
  76                 }
  77         },
  78         {
  79                 .ident = "WinBook TW700",
  80                 .matches = {
  81                         DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
  82                         DMI_MATCH(DMI_PRODUCT_NAME, "TW700")
  83                 },
  84         },
  85 #endif
  86         {}
  87 };
  88
  89 /**
  90  * goodix_i2c_read - read data from a register of the i2c slave device.
  91  *
  92  * @client: i2c device.
  93  * @reg: the register to read from.
  94  * @buf: raw write data buffer.
  95  * @len: length of the buffer to write
  96  */
  97 static int goodix_i2c_read(struct i2c_client *client,
  98                            u16 reg, u8 *buf, int len)
  99 {
 100         struct i2c_msg msgs[2];
 101         u16 wbuf = cpu_to_be16(reg);
 102         int ret;
 103
 104         msgs[0].flags = 0;
 105         msgs[0].addr  = client->addr;
 106         msgs[0].len   = 2;
 107         msgs[0].buf   = (u8 *)&wbuf;
 108
 109         msgs[1].flags = I2C_M_RD;
 110         msgs[1].addr  = client->addr;
 111         msgs[1].len   = len;
 112         msgs[1].buf   = buf;
 113
 114         ret = i2c_transfer(client->adapter, msgs, 2);
 115         return ret < 0 ? ret : (ret != ARRAY_SIZE(msgs) ? -EIO : 0);
 116 }
 117
 118 static int goodix_ts_read_input_report(struct goodix_ts_data *ts, u8 *data)
 119 {
 120         int touch_num;
 121         int error;
 122
 123         error = goodix_i2c_read(ts->client, GOODIX_READ_COOR_ADDR, data,
 124                                 GOODIX_CONTACT_SIZE + 1);
 125         if (error) {
 126                 dev_err(&ts->client->dev, "I2C transfer error: %d\n", error);
 127                 return error;
 128         }
 129
 130         if (!(data[0] & 0x80))
 131                 return -EAGAIN;
 132
 133         touch_num = data[0] & 0x0f;
 134         if (touch_num > ts->max_touch_num)
 135                 return -EPROTO;
 136
 137         if (touch_num > 1) {
 138                 data += 1 + GOODIX_CONTACT_SIZE;
 139                 error = goodix_i2c_read(ts->client,
 140                                         GOODIX_READ_COOR_ADDR +
 141                                                 1 + GOODIX_CONTACT_SIZE,
 142                                         data,
 143                                         GOODIX_CONTACT_SIZE * (touch_num - 1));
 144                 if (error)
 145                         return error;
 146         }
 147
 148         return touch_num;
 149 }
 150
 151 static void goodix_ts_report_touch(struct goodix_ts_data *ts, u8 *coor_data)
 152 {
 153         int id = coor_data[0] & 0x0F;
 154         int input_x = get_unaligned_le16(&coor_data[1]);
 155         int input_y = get_unaligned_le16(&coor_data[3]);
 156         int input_w = get_unaligned_le16(&coor_data[5]);
 157
 158         if (ts->rotated_screen) {
 159                 input_x = ts->abs_x_max - input_x;
 160                 input_y = ts->abs_y_max - input_y;
 161         }
 162
 163         input_mt_slot(ts->input_dev, id);
 164         input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true);
 165         input_report_abs(ts->input_dev, ABS_MT_POSITION_X, input_x);
 166         input_report_abs(ts->input_dev, ABS_MT_POSITION_Y, input_y);
 167         input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w);
 168         input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w);
 169 }
 170
 171 /**
 172  * goodix_process_events - Process incoming events
 173  *
 174  * @ts: our goodix_ts_data pointer
 175  *
 176  * Called when the IRQ is triggered. Read the current device state, and push
 177  * the input events to the user space.
 178  */
 179 static void goodix_process_events(struct goodix_ts_data *ts)
 180 {
 181         u8  point_data[1 + GOODIX_CONTACT_SIZE * GOODIX_MAX_CONTACTS];
 182         int touch_num;
 183         int i;
 184
 185         touch_num = goodix_ts_read_input_report(ts, point_data);
 186         if (touch_num < 0)
 187                 return;
 188
 189         for (i = 0; i < touch_num; i++)
 190                 goodix_ts_report_touch(ts,
 191                                 &point_data[1 + GOODIX_CONTACT_SIZE * i]);
 192
 193         input_mt_sync_frame(ts->input_dev);
 194         input_sync(ts->input_dev);
 195 }
 196
 197 /**
 198  * goodix_ts_irq_handler - The IRQ handler
 199  *
 200  * @irq: interrupt number.
 201  * @dev_id: private data pointer.
 202  */
 203 static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id)
 204 {
 205         static const u8 end_cmd[] = {
 206                 GOODIX_READ_COOR_ADDR >> 8,
 207                 GOODIX_READ_COOR_ADDR & 0xff,
 208                 0
 209         };
 210         struct goodix_ts_data *ts = dev_id;
 211
 212         goodix_process_events(ts);
 213
 214         if (i2c_master_send(ts->client, end_cmd, sizeof(end_cmd)) < 0)
 215                 dev_err(&ts->client->dev, "I2C write end_cmd error\n");
 216
 217         return IRQ_HANDLED;
 218 }
 219
 220 /**
 221  * goodix_read_config - Read the embedded configuration of the panel
 222  *
 223  * @ts: our goodix_ts_data pointer
 224  *
 225  * Must be called during probe
 226  */
 227 static void goodix_read_config(struct goodix_ts_data *ts)
 228 {
 229         u8 config[GOODIX_CONFIG_MAX_LENGTH];
 230         int error;
 231
 232         error = goodix_i2c_read(ts->client, GOODIX_REG_CONFIG_DATA,
 233                                 config,
 234                                 GOODIX_CONFIG_MAX_LENGTH);
 235         if (error) {
 236                 dev_warn(&ts->client->dev,
 237                          "Error reading config (%d), using defaults\n",
 238                          error);
 239                 ts->abs_x_max = GOODIX_MAX_WIDTH;
 240                 ts->abs_y_max = GOODIX_MAX_HEIGHT;
 241                 ts->int_trigger_type = GOODIX_INT_TRIGGER;
 242                 ts->max_touch_num = GOODIX_MAX_CONTACTS;
 243                 return;
 244         }
 245
 246         ts->abs_x_max = get_unaligned_le16(&config[RESOLUTION_LOC]);
 247         ts->abs_y_max = get_unaligned_le16(&config[RESOLUTION_LOC + 2]);
 248         ts->int_trigger_type = config[TRIGGER_LOC] & 0x03;
 249         ts->max_touch_num = config[MAX_CONTACTS_LOC] & 0x0f;
 250         if (!ts->abs_x_max || !ts->abs_y_max || !ts->max_touch_num) {
 251                 dev_err(&ts->client->dev,
 252                         "Invalid config, using defaults\n");
 253                 ts->abs_x_max = GOODIX_MAX_WIDTH;
 254                 ts->abs_y_max = GOODIX_MAX_HEIGHT;
 255                 ts->max_touch_num = GOODIX_MAX_CONTACTS;
 256         }
 257
 258         ts->rotated_screen = dmi_check_system(rotated_screen);
 259         if (ts->rotated_screen)
 260                 dev_dbg(&ts->client->dev,
 261                          "Applying '180 degrees rotated screen' quirk\n");
 262 }
 263
 264 /**
 265  * goodix_read_version - Read goodix touchscreen version
 266  *
 267  * @client: the i2c client
 268  * @version: output buffer containing the version on success
 269  * @id: output buffer containing the id on success
 270  */
 271 static int goodix_read_version(struct i2c_client *client, u16 *version, u16 *id)
 272 {
 273         int error;
 274         u8 buf[6];
 275         char id_str[5];
 276
 277         error = goodix_i2c_read(client, GOODIX_REG_ID, buf, sizeof(buf));
 278         if (error) {
 279                 dev_err(&client->dev, "read version failed: %d\n", error);
 280                 return error;
 281         }
 282
 283         memcpy(id_str, buf, 4);
 284         id_str[4] = 0;
 285         if (kstrtou16(id_str, 10, id))
 286                 *id = 0x1001;
 287
 288         *version = get_unaligned_le16(&buf[4]);
 289
 290         dev_info(&client->dev, "ID %d, version: %04x\n", *id, *version);
 291
 292         return 0;
 293 }
 294
 295 /**
 296  * goodix_i2c_test - I2C test function to check if the device answers.
 297  *
 298  * @client: the i2c client
 299  */
 300 static int goodix_i2c_test(struct i2c_client *client)
 301 {
 302         int retry = 0;
 303         int error;
 304         u8 test;
 305
 306         while (retry++ < 2) {
 307                 error = goodix_i2c_read(client, GOODIX_REG_CONFIG_DATA,
 308                                         &test, 1);
 309                 if (!error)
 310                         return 0;
 311
 312                 dev_err(&client->dev, "i2c test failed attempt %d: %d\n",
 313                         retry, error);
 314                 msleep(20);
 315         }
 316
 317         return error;
 318 }
 319
 320 /**
 321  * goodix_request_input_dev - Allocate, populate and register the input device
 322  *
 323  * @ts: our goodix_ts_data pointer
 324  * @version: device firmware version
 325  * @id: device ID
 326  *
 327  * Must be called during probe
 328  */
 329 static int goodix_request_input_dev(struct goodix_ts_data *ts, u16 version,
 330                                     u16 id)
 331 {
 332         int error;
 333
 334         ts->input_dev = devm_input_allocate_device(&ts->client->dev);
 335         if (!ts->input_dev) {
 336                 dev_err(&ts->client->dev, "Failed to allocate input device.");
 337                 return -ENOMEM;
 338         }
 339
 340         input_set_abs_params(ts->input_dev, ABS_MT_POSITION_X,
 341                              0, ts->abs_x_max, 0, 0);
 342         input_set_abs_params(ts->input_dev, ABS_MT_POSITION_Y,
 343                              0, ts->abs_y_max, 0, 0);
 344         input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
 345         input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
 346
 347         input_mt_init_slots(ts->input_dev, ts->max_touch_num,
 348                             INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
 349
 350         ts->input_dev->name = "Goodix Capacitive TouchScreen";
 351         ts->input_dev->phys = "input/ts";
 352         ts->input_dev->id.bustype = BUS_I2C;
 353         ts->input_dev->id.vendor = 0x0416;
 354         ts->input_dev->id.product = id;
 355         ts->input_dev->id.version = version;
 356
 357         error = input_register_device(ts->input_dev);
 358         if (error) {
 359                 dev_err(&ts->client->dev,
 360                         "Failed to register input device: %d", error);
 361                 return error;
 362         }
 363
 364         return 0;
 365 }
 366
 367 static int goodix_ts_probe(struct i2c_client *client,
 368                            const struct i2c_device_id *id)
 369 {
 370         struct goodix_ts_data *ts;
 371         unsigned long irq_flags;
 372         int error;
 373         u16 version_info, id_info;
 374
 375         dev_dbg(&client->dev, "I2C Address: 0x%02x\n", client->addr);
 376
 377         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 378                 dev_err(&client->dev, "I2C check functionality failed.\n");
 379                 return -ENXIO;
 380         }
 381
 382         ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
 383         if (!ts)
 384                 return -ENOMEM;
 385
 386         ts->client = client;
 387         i2c_set_clientdata(client, ts);
 388
 389         error = goodix_i2c_test(client);
 390         if (error) {
 391                 dev_err(&client->dev, "I2C communication failure: %d\n", error);
 392                 return error;
 393         }
 394
 395         error = goodix_read_version(client, &version_info, &id_info);
 396         if (error) {
 397                 dev_err(&client->dev, "Read version failed.\n");
 398                 return error;
 399         }
 400
 401         goodix_read_config(ts);
 402
 403         error = goodix_request_input_dev(ts, version_info, id_info);
 404         if (error)
 405                 return error;
 406
 407         irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT;
 408         error = devm_request_threaded_irq(&ts->client->dev, client->irq,
 409                                           NULL, goodix_ts_irq_handler,
 410                                           irq_flags, client->name, ts);
 411         if (error) {
 412                 dev_err(&client->dev, "request IRQ failed: %d\n", error);
 413                 return error;
 414         }
 415
 416         return 0;
 417 }
 418
 419 static const struct i2c_device_id goodix_ts_id[] = {
 420         { "GDIX1001:00", 0 },
 421         { }
 422 };
 423 MODULE_DEVICE_TABLE(i2c, goodix_ts_id);
 424
 425 #ifdef CONFIG_ACPI
 426 static const struct acpi_device_id goodix_acpi_match[] = {
 427         { "GDIX1001", 0 },
 428         { }
 429 };
 430 MODULE_DEVICE_TABLE(acpi, goodix_acpi_match);
 431 #endif
 432
 433 #ifdef CONFIG_OF
 434 static const struct of_device_id goodix_of_match[] = {
 435         { .compatible = "goodix,gt911" },
 436         { .compatible = "goodix,gt9110" },
 437         { .compatible = "goodix,gt912" },
 438         { .compatible = "goodix,gt927" },
 439         { .compatible = "goodix,gt9271" },
 440         { .compatible = "goodix,gt928" },
 441         { .compatible = "goodix,gt967" },
 442         { }
 443 };
 444 MODULE_DEVICE_TABLE(of, goodix_of_match);
 445 #endif
 446
 447 static struct i2c_driver goodix_ts_driver = {
 448         .probe = goodix_ts_probe,
 449         .id_table = goodix_ts_id,
 450         .driver = {
 451                 .name = "Goodix-TS",
 452                 .acpi_match_table = ACPI_PTR(goodix_acpi_match),
 453                 .of_match_table = of_match_ptr(goodix_of_match),
 454         },
 455 };
 456 module_i2c_driver(goodix_ts_driver);
 457
 458 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
 459 MODULE_AUTHOR("Bastien Nocera <hadess@hadess.net>");
 460 MODULE_DESCRIPTION("Goodix touchscreen driver");
 461 MODULE_LICENSE("GPL v2");