drivers/input/touchscreen/cy8ctmg110_ts.c

   1 /*
   2  * Driver for cypress touch screen controller
   3  *
   4  * Copyright (c) 2009 Aava Mobile
   5  *
   6  * Some cleanups by Alan Cox <alan@linux.intel.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/input.h>
  25 #include <linux/slab.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/io.h>
  28 #include <linux/i2c.h>
  29 #include <linux/gpio.h>
  30 #include <linux/input/cy8ctmg110_pdata.h>
  31
  32 #define CY8CTMG110_DRIVER_NAME      "cy8ctmg110"
  33
  34 /* Touch coordinates */
  35 #define CY8CTMG110_X_MIN                0
  36 #define CY8CTMG110_Y_MIN                0
  37 #define CY8CTMG110_X_MAX                759
  38 #define CY8CTMG110_Y_MAX                465
  39
  40
  41 /* cy8ctmg110 register definitions */
  42 #define CY8CTMG110_TOUCH_WAKEUP_TIME    0
  43 #define CY8CTMG110_TOUCH_SLEEP_TIME     2
  44 #define CY8CTMG110_TOUCH_X1             3
  45 #define CY8CTMG110_TOUCH_Y1             5
  46 #define CY8CTMG110_TOUCH_X2             7
  47 #define CY8CTMG110_TOUCH_Y2             9
  48 #define CY8CTMG110_FINGERS              11
  49 #define CY8CTMG110_GESTURE              12
  50 #define CY8CTMG110_REG_MAX              13
  51
  52
  53 /*
  54  * The touch driver structure.
  55  */
  56 struct cy8ctmg110 {
  57         struct input_dev *input;
  58         char phys[32];
  59         struct i2c_client *client;
  60         int reset_pin;
  61         int irq_pin;
  62 };
  63
  64 /*
  65  * cy8ctmg110_power is the routine that is called when touch hardware
  66  * will powered off or on.
  67  */
  68 static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron)
  69 {
  70         if (ts->reset_pin)
  71                 gpio_direction_output(ts->reset_pin, 1 - poweron);
  72 }
  73
  74 static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg,
  75                 unsigned char len, unsigned char *value)
  76 {
  77         struct i2c_client *client = tsc->client;
  78         int ret;
  79         unsigned char i2c_data[6];
  80
  81         BUG_ON(len > 5);
  82
  83         i2c_data[0] = reg;
  84         memcpy(i2c_data + 1, value, len);
  85
  86         ret = i2c_master_send(client, i2c_data, len + 1);
  87         if (ret != len + 1) {
  88                 dev_err(&client->dev, "i2c write data cmd failed\n");
  89                 return ret < 0 ? ret : -EIO;
  90         }
  91
  92         return 0;
  93 }
  94
  95 static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc,
  96                 unsigned char *data, unsigned char len, unsigned char cmd)
  97 {
  98         struct i2c_client *client = tsc->client;
  99         int ret;
 100         struct i2c_msg msg[2] = {
 101                 /* first write slave position to i2c devices */
 102                 {
 103                         .addr = client->addr,
 104                         .len = 1,
 105                         .buf = &cmd
 106                 },
 107                 /* Second read data from position */
 108                 {
 109                         .addr = client->addr,
 110                         .flags = I2C_M_RD,
 111                         .len = len,
 112                         .buf = data
 113                 }
 114         };
 115
 116         ret = i2c_transfer(client->adapter, msg, 2);
 117         if (ret < 0)
 118                 return ret;
 119
 120         return 0;
 121 }
 122
 123 static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
 124 {
 125         struct input_dev *input = tsc->input;
 126         unsigned char reg_p[CY8CTMG110_REG_MAX];
 127         int x, y;
 128
 129         memset(reg_p, 0, CY8CTMG110_REG_MAX);
 130
 131         /* Reading coordinates */
 132         if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
 133                 return -EIO;
 134
 135         y = reg_p[2] << 8 | reg_p[3];
 136         x = reg_p[0] << 8 | reg_p[1];
 137
 138         /* Number of touch */
 139         if (reg_p[8] == 0) {
 140                 input_report_key(input, BTN_TOUCH, 0);
 141         } else  {
 142                 input_report_key(input, BTN_TOUCH, 1);
 143                 input_report_abs(input, ABS_X, x);
 144                 input_report_abs(input, ABS_Y, y);
 145         }
 146
 147         input_sync(input);
 148
 149         return 0;
 150 }
 151
 152 static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep)
 153 {
 154         unsigned char reg_p[3];
 155
 156         if (sleep) {
 157                 reg_p[0] = 0x00;
 158                 reg_p[1] = 0xff;
 159                 reg_p[2] = 5;
 160         } else {
 161                 reg_p[0] = 0x10;
 162                 reg_p[1] = 0xff;
 163                 reg_p[2] = 0;
 164         }
 165
 166         return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p);
 167 }
 168
 169 static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id)
 170 {
 171         struct cy8ctmg110 *tsc = dev_id;
 172
 173         cy8ctmg110_touch_pos(tsc);
 174
 175         return IRQ_HANDLED;
 176 }
 177
 178 static int cy8ctmg110_probe(struct i2c_client *client,
 179                                         const struct i2c_device_id *id)
 180 {
 181         const struct cy8ctmg110_pdata *pdata = dev_get_platdata(&client->dev);
 182         struct cy8ctmg110 *ts;
 183         struct input_dev *input_dev;
 184         int err;
 185
 186         /* No pdata no way forward */
 187         if (pdata == NULL) {
 188                 dev_err(&client->dev, "no pdata\n");
 189                 return -ENODEV;
 190         }
 191
 192         if (!i2c_check_functionality(client->adapter,
 193                                         I2C_FUNC_SMBUS_READ_WORD_DATA))
 194                 return -EIO;
 195
 196         ts = kzalloc(sizeof(struct cy8ctmg110), GFP_KERNEL);
 197         input_dev = input_allocate_device();
 198         if (!ts || !input_dev) {
 199                 err = -ENOMEM;
 200                 goto err_free_mem;
 201         }
 202
 203         ts->client = client;
 204         ts->input = input_dev;
 205         ts->reset_pin = pdata->reset_pin;
 206         ts->irq_pin = pdata->irq_pin;
 207
 208         snprintf(ts->phys, sizeof(ts->phys),
 209                  "%s/input0", dev_name(&client->dev));
 210
 211         input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
 212         input_dev->phys = ts->phys;
 213         input_dev->id.bustype = BUS_I2C;
 214         input_dev->dev.parent = &client->dev;
 215
 216         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 217         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 218
 219         input_set_abs_params(input_dev, ABS_X,
 220                         CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0);
 221         input_set_abs_params(input_dev, ABS_Y,
 222                         CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0);
 223
 224         if (ts->reset_pin) {
 225                 err = gpio_request(ts->reset_pin, NULL);
 226                 if (err) {
 227                         dev_err(&client->dev,
 228                                 "Unable to request GPIO pin %d.\n",
 229                                 ts->reset_pin);
 230                         goto err_free_mem;
 231                 }
 232         }
 233
 234         cy8ctmg110_power(ts, true);
 235         cy8ctmg110_set_sleepmode(ts, false);
 236
 237         err = gpio_request(ts->irq_pin, "touch_irq_key");
 238         if (err < 0) {
 239                 dev_err(&client->dev,
 240                         "Failed to request GPIO %d, error %d\n",
 241                         ts->irq_pin, err);
 242                 goto err_shutoff_device;
 243         }
 244
 245         err = gpio_direction_input(ts->irq_pin);
 246         if (err < 0) {
 247                 dev_err(&client->dev,
 248                         "Failed to configure input direction for GPIO %d, error %d\n",
 249                         ts->irq_pin, err);
 250                 goto err_free_irq_gpio;
 251         }
 252
 253         client->irq = gpio_to_irq(ts->irq_pin);
 254         if (client->irq < 0) {
 255                 err = client->irq;
 256                 dev_err(&client->dev,
 257                         "Unable to get irq number for GPIO %d, error %d\n",
 258                         ts->irq_pin, err);
 259                 goto err_free_irq_gpio;
 260         }
 261
 262         err = request_threaded_irq(client->irq, NULL, cy8ctmg110_irq_thread,
 263                                    IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 264                                    "touch_reset_key", ts);
 265         if (err < 0) {
 266                 dev_err(&client->dev,
 267                         "irq %d busy? error %d\n", client->irq, err);
 268                 goto err_free_irq_gpio;
 269         }
 270
 271         err = input_register_device(input_dev);
 272         if (err)
 273                 goto err_free_irq;
 274
 275         i2c_set_clientdata(client, ts);
 276         device_init_wakeup(&client->dev, 1);
 277         return 0;
 278
 279 err_free_irq:
 280         free_irq(client->irq, ts);
 281 err_free_irq_gpio:
 282         gpio_free(ts->irq_pin);
 283 err_shutoff_device:
 284         cy8ctmg110_set_sleepmode(ts, true);
 285         cy8ctmg110_power(ts, false);
 286         if (ts->reset_pin)
 287                 gpio_free(ts->reset_pin);
 288 err_free_mem:
 289         input_free_device(input_dev);
 290         kfree(ts);
 291         return err;
 292 }
 293
 294 static int __maybe_unused cy8ctmg110_suspend(struct device *dev)
 295 {
 296         struct i2c_client *client = to_i2c_client(dev);
 297         struct cy8ctmg110 *ts = i2c_get_clientdata(client);
 298
 299         if (device_may_wakeup(&client->dev))
 300                 enable_irq_wake(client->irq);
 301         else {
 302                 cy8ctmg110_set_sleepmode(ts, true);
 303                 cy8ctmg110_power(ts, false);
 304         }
 305         return 0;
 306 }
 307
 308 static int __maybe_unused cy8ctmg110_resume(struct device *dev)
 309 {
 310         struct i2c_client *client = to_i2c_client(dev);
 311         struct cy8ctmg110 *ts = i2c_get_clientdata(client);
 312
 313         if (device_may_wakeup(&client->dev))
 314                 disable_irq_wake(client->irq);
 315         else {
 316                 cy8ctmg110_power(ts, true);
 317                 cy8ctmg110_set_sleepmode(ts, false);
 318         }
 319         return 0;
 320 }
 321
 322 static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume);
 323
 324 static int cy8ctmg110_remove(struct i2c_client *client)
 325 {
 326         struct cy8ctmg110 *ts = i2c_get_clientdata(client);
 327
 328         cy8ctmg110_set_sleepmode(ts, true);
 329         cy8ctmg110_power(ts, false);
 330
 331         free_irq(client->irq, ts);
 332         input_unregister_device(ts->input);
 333         gpio_free(ts->irq_pin);
 334         if (ts->reset_pin)
 335                 gpio_free(ts->reset_pin);
 336         kfree(ts);
 337
 338         return 0;
 339 }
 340
 341 static const struct i2c_device_id cy8ctmg110_idtable[] = {
 342         { CY8CTMG110_DRIVER_NAME, 1 },
 343         { }
 344 };
 345
 346 MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);
 347
 348 static struct i2c_driver cy8ctmg110_driver = {
 349         .driver         = {
 350                 .name   = CY8CTMG110_DRIVER_NAME,
 351                 .pm     = &cy8ctmg110_pm,
 352         },
 353         .id_table       = cy8ctmg110_idtable,
 354         .probe          = cy8ctmg110_probe,
 355         .remove         = cy8ctmg110_remove,
 356 };
 357
 358 module_i2c_driver(cy8ctmg110_driver);
 359
 360 MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
 361 MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
 362 MODULE_LICENSE("GPL v2");