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                 { client->addr, 0, 1, &cmd },
 103                 /* Second read data from position */
 104                 { client->addr, I2C_M_RD, len, data }
 105         };
 106
 107         ret = i2c_transfer(client->adapter, msg, 2);
 108         if (ret < 0)
 109                 return ret;
 110
 111         return 0;
 112 }
 113
 114 static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
 115 {
 116         struct input_dev *input = tsc->input;
 117         unsigned char reg_p[CY8CTMG110_REG_MAX];
 118         int x, y;
 119
 120         memset(reg_p, 0, CY8CTMG110_REG_MAX);
 121
 122         /* Reading coordinates */
 123         if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
 124                 return -EIO;
 125
 126         y = reg_p[2] << 8 | reg_p[3];
 127         x = reg_p[0] << 8 | reg_p[1];
 128
 129         /* Number of touch */
 130         if (reg_p[8] == 0) {
 131                 input_report_key(input, BTN_TOUCH, 0);
 132         } else  {
 133                 input_report_key(input, BTN_TOUCH, 1);
 134                 input_report_abs(input, ABS_X, x);
 135                 input_report_abs(input, ABS_Y, y);
 136         }
 137
 138         input_sync(input);
 139
 140         return 0;
 141 }
 142
 143 static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep)
 144 {
 145         unsigned char reg_p[3];
 146
 147         if (sleep) {
 148                 reg_p[0] = 0x00;
 149                 reg_p[1] = 0xff;
 150                 reg_p[2] = 5;
 151         } else {
 152                 reg_p[0] = 0x10;
 153                 reg_p[1] = 0xff;
 154                 reg_p[2] = 0;
 155         }
 156
 157         return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p);
 158 }
 159
 160 static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id)
 161 {
 162         struct cy8ctmg110 *tsc = dev_id;
 163
 164         cy8ctmg110_touch_pos(tsc);
 165
 166         return IRQ_HANDLED;
 167 }
 168
 169 static int __devinit cy8ctmg110_probe(struct i2c_client *client,
 170                                         const struct i2c_device_id *id)
 171 {
 172         const struct cy8ctmg110_pdata *pdata = client->dev.platform_data;
 173         struct cy8ctmg110 *ts;
 174         struct input_dev *input_dev;
 175         int err;
 176
 177         /* No pdata no way forward */
 178         if (pdata == NULL) {
 179                 dev_err(&client->dev, "no pdata\n");
 180                 return -ENODEV;
 181         }
 182
 183         if (!i2c_check_functionality(client->adapter,
 184                                         I2C_FUNC_SMBUS_READ_WORD_DATA))
 185                 return -EIO;
 186
 187         ts = kzalloc(sizeof(struct cy8ctmg110), GFP_KERNEL);
 188         input_dev = input_allocate_device();
 189         if (!ts || !input_dev) {
 190                 err = -ENOMEM;
 191                 goto err_free_mem;
 192         }
 193
 194         ts->client = client;
 195         ts->input = input_dev;
 196         ts->reset_pin = pdata->reset_pin;
 197         ts->irq_pin = pdata->irq_pin;
 198
 199         snprintf(ts->phys, sizeof(ts->phys),
 200                  "%s/input0", dev_name(&client->dev));
 201
 202         input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
 203         input_dev->phys = ts->phys;
 204         input_dev->id.bustype = BUS_I2C;
 205         input_dev->dev.parent = &client->dev;
 206
 207         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 208         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 209
 210         input_set_abs_params(input_dev, ABS_X,
 211                         CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0);
 212         input_set_abs_params(input_dev, ABS_Y,
 213                         CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0);
 214
 215         if (ts->reset_pin) {
 216                 err = gpio_request(ts->reset_pin, NULL);
 217                 if (err) {
 218                         dev_err(&client->dev,
 219                                 "Unable to request GPIO pin %d.\n",
 220                                 ts->reset_pin);
 221                         goto err_free_mem;
 222                 }
 223         }
 224
 225         cy8ctmg110_power(ts, true);
 226         cy8ctmg110_set_sleepmode(ts, false);
 227
 228         err = gpio_request(ts->irq_pin, "touch_irq_key");
 229         if (err < 0) {
 230                 dev_err(&client->dev,
 231                         "Failed to request GPIO %d, error %d\n",
 232                         ts->irq_pin, err);
 233                 goto err_shutoff_device;
 234         }
 235
 236         err = gpio_direction_input(ts->irq_pin);
 237         if (err < 0) {
 238                 dev_err(&client->dev,
 239                         "Failed to configure input direction for GPIO %d, error %d\n",
 240                         ts->irq_pin, err);
 241                 goto err_free_irq_gpio;
 242         }
 243
 244         client->irq = gpio_to_irq(ts->irq_pin);
 245         if (client->irq < 0) {
 246                 err = client->irq;
 247                 dev_err(&client->dev,
 248                         "Unable to get irq number for GPIO %d, error %d\n",
 249                         ts->irq_pin, err);
 250                 goto err_free_irq_gpio;
 251         }
 252
 253         err = request_threaded_irq(client->irq, NULL, cy8ctmg110_irq_thread,
 254                                    IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 255                                    "touch_reset_key", ts);
 256         if (err < 0) {
 257                 dev_err(&client->dev,
 258                         "irq %d busy? error %d\n", client->irq, err);
 259                 goto err_free_irq_gpio;
 260         }
 261
 262         err = input_register_device(input_dev);
 263         if (err)
 264                 goto err_free_irq;
 265
 266         i2c_set_clientdata(client, ts);
 267         device_init_wakeup(&client->dev, 1);
 268         return 0;
 269
 270 err_free_irq:
 271         free_irq(client->irq, ts);
 272 err_free_irq_gpio:
 273         gpio_free(ts->irq_pin);
 274 err_shutoff_device:
 275         cy8ctmg110_set_sleepmode(ts, true);
 276         cy8ctmg110_power(ts, false);
 277         if (ts->reset_pin)
 278                 gpio_free(ts->reset_pin);
 279 err_free_mem:
 280         input_free_device(input_dev);
 281         kfree(ts);
 282         return err;
 283 }
 284
 285 #ifdef CONFIG_PM
 286 static int cy8ctmg110_suspend(struct device *dev)
 287 {
 288         struct i2c_client *client = to_i2c_client(dev);
 289         struct cy8ctmg110 *ts = i2c_get_clientdata(client);
 290
 291         if (device_may_wakeup(&client->dev))
 292                 enable_irq_wake(client->irq);
 293         else {
 294                 cy8ctmg110_set_sleepmode(ts, true);
 295                 cy8ctmg110_power(ts, false);
 296         }
 297         return 0;
 298 }
 299
 300 static int cy8ctmg110_resume(struct device *dev)
 301 {
 302         struct i2c_client *client = to_i2c_client(dev);
 303         struct cy8ctmg110 *ts = i2c_get_clientdata(client);
 304
 305         if (device_may_wakeup(&client->dev))
 306                 disable_irq_wake(client->irq);
 307         else {
 308                 cy8ctmg110_power(ts, true);
 309                 cy8ctmg110_set_sleepmode(ts, false);
 310         }
 311         return 0;
 312 }
 313
 314 static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume);
 315 #endif
 316
 317 static int __devexit cy8ctmg110_remove(struct i2c_client *client)
 318 {
 319         struct cy8ctmg110 *ts = i2c_get_clientdata(client);
 320
 321         cy8ctmg110_set_sleepmode(ts, true);
 322         cy8ctmg110_power(ts, false);
 323
 324         free_irq(client->irq, ts);
 325         input_unregister_device(ts->input);
 326         gpio_free(ts->irq_pin);
 327         if (ts->reset_pin)
 328                 gpio_free(ts->reset_pin);
 329         kfree(ts);
 330
 331         return 0;
 332 }
 333
 334 static const struct i2c_device_id cy8ctmg110_idtable[] = {
 335         { CY8CTMG110_DRIVER_NAME, 1 },
 336         { }
 337 };
 338
 339 MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);
 340
 341 static struct i2c_driver cy8ctmg110_driver = {
 342         .driver         = {
 343                 .owner  = THIS_MODULE,
 344                 .name   = CY8CTMG110_DRIVER_NAME,
 345 #ifdef CONFIG_PM
 346                 .pm     = &cy8ctmg110_pm,
 347 #endif
 348         },
 349         .id_table       = cy8ctmg110_idtable,
 350         .probe          = cy8ctmg110_probe,
 351         .remove         = __devexit_p(cy8ctmg110_remove),
 352 };
 353
 354 module_i2c_driver(cy8ctmg110_driver);
 355
 356 MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
 357 MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
 358 MODULE_LICENSE("GPL v2");