Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 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; |
Dan Carpenter | f1b5076 | 2010-08-09 10:06:47 -0700 | [diff] [blame] | 78 | int ret; |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 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); |
Axel Lin | 21184c4 | 2011-07-13 00:03:36 -0700 | [diff] [blame] | 87 | if (ret != len + 1) { |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 88 | dev_err(&client->dev, "i2c write data cmd failed\n"); |
Axel Lin | 21184c4 | 2011-07-13 00:03:36 -0700 | [diff] [blame] | 89 | return ret < 0 ? ret : -EIO; |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 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; |
Dan Carpenter | f1b5076 | 2010-08-09 10:06:47 -0700 | [diff] [blame] | 99 | int ret; |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 100 | struct i2c_msg msg[2] = { |
| 101 | /* first write slave position to i2c devices */ |
Shubhrajyoti Datta | 9493d97 | 2012-10-10 09:34:00 -0700 | [diff] [blame^] | 102 | { |
| 103 | .addr = client->addr, |
| 104 | .len = 1, |
| 105 | .buf = &cmd |
| 106 | }, |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 107 | /* Second read data from position */ |
Shubhrajyoti Datta | 9493d97 | 2012-10-10 09:34:00 -0700 | [diff] [blame^] | 108 | { |
| 109 | .addr = client->addr, |
| 110 | .flags = I2C_M_RD, |
| 111 | .len = len, |
| 112 | .buf = data |
| 113 | } |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 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 __devinit cy8ctmg110_probe(struct i2c_client *client, |
| 179 | const struct i2c_device_id *id) |
| 180 | { |
| 181 | const struct cy8ctmg110_pdata *pdata = client->dev.platform_data; |
| 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; |
Axel Lin | 2c20410 | 2011-07-18 17:09:37 -0700 | [diff] [blame] | 205 | ts->reset_pin = pdata->reset_pin; |
| 206 | ts->irq_pin = pdata->irq_pin; |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 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, |
James Ketrenos | a4e6aad | 2010-09-06 12:49:33 -0700 | [diff] [blame] | 220 | CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0); |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 221 | input_set_abs_params(input_dev, ABS_Y, |
James Ketrenos | a4e6aad | 2010-09-06 12:49:33 -0700 | [diff] [blame] | 222 | CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0); |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 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, |
Lars-Peter Clausen | 9b7e31b | 2012-07-04 13:02:56 -0700 | [diff] [blame] | 263 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, |
| 264 | "touch_reset_key", ts); |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 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 | #ifdef CONFIG_PM |
Mark Brown | 93f38e9 | 2011-01-06 23:01:03 -0800 | [diff] [blame] | 295 | static int cy8ctmg110_suspend(struct device *dev) |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 296 | { |
Mark Brown | 93f38e9 | 2011-01-06 23:01:03 -0800 | [diff] [blame] | 297 | struct i2c_client *client = to_i2c_client(dev); |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 298 | struct cy8ctmg110 *ts = i2c_get_clientdata(client); |
| 299 | |
| 300 | if (device_may_wakeup(&client->dev)) |
| 301 | enable_irq_wake(client->irq); |
| 302 | else { |
| 303 | cy8ctmg110_set_sleepmode(ts, true); |
| 304 | cy8ctmg110_power(ts, false); |
| 305 | } |
| 306 | return 0; |
| 307 | } |
| 308 | |
Mark Brown | 93f38e9 | 2011-01-06 23:01:03 -0800 | [diff] [blame] | 309 | static int cy8ctmg110_resume(struct device *dev) |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 310 | { |
Mark Brown | 93f38e9 | 2011-01-06 23:01:03 -0800 | [diff] [blame] | 311 | struct i2c_client *client = to_i2c_client(dev); |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 312 | struct cy8ctmg110 *ts = i2c_get_clientdata(client); |
| 313 | |
| 314 | if (device_may_wakeup(&client->dev)) |
| 315 | disable_irq_wake(client->irq); |
| 316 | else { |
| 317 | cy8ctmg110_power(ts, true); |
| 318 | cy8ctmg110_set_sleepmode(ts, false); |
| 319 | } |
| 320 | return 0; |
| 321 | } |
Mark Brown | 93f38e9 | 2011-01-06 23:01:03 -0800 | [diff] [blame] | 322 | |
| 323 | static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume); |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 324 | #endif |
| 325 | |
| 326 | static int __devexit cy8ctmg110_remove(struct i2c_client *client) |
| 327 | { |
| 328 | struct cy8ctmg110 *ts = i2c_get_clientdata(client); |
| 329 | |
| 330 | cy8ctmg110_set_sleepmode(ts, true); |
| 331 | cy8ctmg110_power(ts, false); |
| 332 | |
| 333 | free_irq(client->irq, ts); |
| 334 | input_unregister_device(ts->input); |
| 335 | gpio_free(ts->irq_pin); |
| 336 | if (ts->reset_pin) |
| 337 | gpio_free(ts->reset_pin); |
| 338 | kfree(ts); |
| 339 | |
| 340 | return 0; |
| 341 | } |
| 342 | |
Axel Lin | d448303 | 2011-07-13 00:04:36 -0700 | [diff] [blame] | 343 | static const struct i2c_device_id cy8ctmg110_idtable[] = { |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 344 | { CY8CTMG110_DRIVER_NAME, 1 }, |
| 345 | { } |
| 346 | }; |
| 347 | |
| 348 | MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable); |
| 349 | |
| 350 | static struct i2c_driver cy8ctmg110_driver = { |
| 351 | .driver = { |
| 352 | .owner = THIS_MODULE, |
| 353 | .name = CY8CTMG110_DRIVER_NAME, |
Mark Brown | 93f38e9 | 2011-01-06 23:01:03 -0800 | [diff] [blame] | 354 | #ifdef CONFIG_PM |
| 355 | .pm = &cy8ctmg110_pm, |
| 356 | #endif |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 357 | }, |
| 358 | .id_table = cy8ctmg110_idtable, |
| 359 | .probe = cy8ctmg110_probe, |
| 360 | .remove = __devexit_p(cy8ctmg110_remove), |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 361 | }; |
| 362 | |
Axel Lin | 1b92c1c | 2012-03-16 23:05:41 -0700 | [diff] [blame] | 363 | module_i2c_driver(cy8ctmg110_driver); |
Samuli Konttila | 60347c1 | 2010-07-30 09:02:43 -0700 | [diff] [blame] | 364 | |
| 365 | MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>"); |
| 366 | MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver"); |
| 367 | MODULE_LICENSE("GPL v2"); |