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Linux/drivers/input/touchscreen/mcs5000_ts.c

  1 /*
  2  * mcs5000_ts.c - Touchscreen driver for MELFAS MCS-5000 controller
  3  *
  4  * Copyright (C) 2009 Samsung Electronics Co.Ltd
  5  * Author: Joonyoung Shim <jy0922.shim@samsung.com>
  6  *
  7  * Based on wm97xx-core.c
  8  *
  9  *  This program is free software; you can redistribute  it and/or modify it
 10  *  under  the terms of  the GNU General  Public License as published by the
 11  *  Free Software Foundation;  either version 2 of the  License, or (at your
 12  *  option) any later version.
 13  *
 14  */
 15 
 16 #include <linux/module.h>
 17 #include <linux/i2c.h>
 18 #include <linux/i2c/mcs.h>
 19 #include <linux/interrupt.h>
 20 #include <linux/input.h>
 21 #include <linux/irq.h>
 22 #include <linux/slab.h>
 23 
 24 /* Registers */
 25 #define MCS5000_TS_STATUS               0x00
 26 #define STATUS_OFFSET                   0
 27 #define STATUS_NO                       (0 << STATUS_OFFSET)
 28 #define STATUS_INIT                     (1 << STATUS_OFFSET)
 29 #define STATUS_SENSING                  (2 << STATUS_OFFSET)
 30 #define STATUS_COORD                    (3 << STATUS_OFFSET)
 31 #define STATUS_GESTURE                  (4 << STATUS_OFFSET)
 32 #define ERROR_OFFSET                    4
 33 #define ERROR_NO                        (0 << ERROR_OFFSET)
 34 #define ERROR_POWER_ON_RESET            (1 << ERROR_OFFSET)
 35 #define ERROR_INT_RESET                 (2 << ERROR_OFFSET)
 36 #define ERROR_EXT_RESET                 (3 << ERROR_OFFSET)
 37 #define ERROR_INVALID_REG_ADDRESS       (8 << ERROR_OFFSET)
 38 #define ERROR_INVALID_REG_VALUE         (9 << ERROR_OFFSET)
 39 
 40 #define MCS5000_TS_OP_MODE              0x01
 41 #define RESET_OFFSET                    0
 42 #define RESET_NO                        (0 << RESET_OFFSET)
 43 #define RESET_EXT_SOFT                  (1 << RESET_OFFSET)
 44 #define OP_MODE_OFFSET                  1
 45 #define OP_MODE_SLEEP                   (0 << OP_MODE_OFFSET)
 46 #define OP_MODE_ACTIVE                  (1 << OP_MODE_OFFSET)
 47 #define GESTURE_OFFSET                  4
 48 #define GESTURE_DISABLE                 (0 << GESTURE_OFFSET)
 49 #define GESTURE_ENABLE                  (1 << GESTURE_OFFSET)
 50 #define PROXIMITY_OFFSET                5
 51 #define PROXIMITY_DISABLE               (0 << PROXIMITY_OFFSET)
 52 #define PROXIMITY_ENABLE                (1 << PROXIMITY_OFFSET)
 53 #define SCAN_MODE_OFFSET                6
 54 #define SCAN_MODE_INTERRUPT             (0 << SCAN_MODE_OFFSET)
 55 #define SCAN_MODE_POLLING               (1 << SCAN_MODE_OFFSET)
 56 #define REPORT_RATE_OFFSET              7
 57 #define REPORT_RATE_40                  (0 << REPORT_RATE_OFFSET)
 58 #define REPORT_RATE_80                  (1 << REPORT_RATE_OFFSET)
 59 
 60 #define MCS5000_TS_SENS_CTL             0x02
 61 #define MCS5000_TS_FILTER_CTL           0x03
 62 #define PRI_FILTER_OFFSET               0
 63 #define SEC_FILTER_OFFSET               4
 64 
 65 #define MCS5000_TS_X_SIZE_UPPER         0x08
 66 #define MCS5000_TS_X_SIZE_LOWER         0x09
 67 #define MCS5000_TS_Y_SIZE_UPPER         0x0A
 68 #define MCS5000_TS_Y_SIZE_LOWER         0x0B
 69 
 70 #define MCS5000_TS_INPUT_INFO           0x10
 71 #define INPUT_TYPE_OFFSET               0
 72 #define INPUT_TYPE_NONTOUCH             (0 << INPUT_TYPE_OFFSET)
 73 #define INPUT_TYPE_SINGLE               (1 << INPUT_TYPE_OFFSET)
 74 #define INPUT_TYPE_DUAL                 (2 << INPUT_TYPE_OFFSET)
 75 #define INPUT_TYPE_PALM                 (3 << INPUT_TYPE_OFFSET)
 76 #define INPUT_TYPE_PROXIMITY            (7 << INPUT_TYPE_OFFSET)
 77 #define GESTURE_CODE_OFFSET             3
 78 #define GESTURE_CODE_NO                 (0 << GESTURE_CODE_OFFSET)
 79 
 80 #define MCS5000_TS_X_POS_UPPER          0x11
 81 #define MCS5000_TS_X_POS_LOWER          0x12
 82 #define MCS5000_TS_Y_POS_UPPER          0x13
 83 #define MCS5000_TS_Y_POS_LOWER          0x14
 84 #define MCS5000_TS_Z_POS                0x15
 85 #define MCS5000_TS_WIDTH                0x16
 86 #define MCS5000_TS_GESTURE_VAL          0x17
 87 #define MCS5000_TS_MODULE_REV           0x20
 88 #define MCS5000_TS_FIRMWARE_VER         0x21
 89 
 90 /* Touchscreen absolute values */
 91 #define MCS5000_MAX_XC                  0x3ff
 92 #define MCS5000_MAX_YC                  0x3ff
 93 
 94 enum mcs5000_ts_read_offset {
 95         READ_INPUT_INFO,
 96         READ_X_POS_UPPER,
 97         READ_X_POS_LOWER,
 98         READ_Y_POS_UPPER,
 99         READ_Y_POS_LOWER,
100         READ_BLOCK_SIZE,
101 };
102 
103 /* Each client has this additional data */
104 struct mcs5000_ts_data {
105         struct i2c_client *client;
106         struct input_dev *input_dev;
107         const struct mcs_platform_data *platform_data;
108 };
109 
110 static irqreturn_t mcs5000_ts_interrupt(int irq, void *dev_id)
111 {
112         struct mcs5000_ts_data *data = dev_id;
113         struct i2c_client *client = data->client;
114         u8 buffer[READ_BLOCK_SIZE];
115         int err;
116         int x;
117         int y;
118 
119         err = i2c_smbus_read_i2c_block_data(client, MCS5000_TS_INPUT_INFO,
120                         READ_BLOCK_SIZE, buffer);
121         if (err < 0) {
122                 dev_err(&client->dev, "%s, err[%d]\n", __func__, err);
123                 goto out;
124         }
125 
126         switch (buffer[READ_INPUT_INFO]) {
127         case INPUT_TYPE_NONTOUCH:
128                 input_report_key(data->input_dev, BTN_TOUCH, 0);
129                 input_sync(data->input_dev);
130                 break;
131 
132         case INPUT_TYPE_SINGLE:
133                 x = (buffer[READ_X_POS_UPPER] << 8) | buffer[READ_X_POS_LOWER];
134                 y = (buffer[READ_Y_POS_UPPER] << 8) | buffer[READ_Y_POS_LOWER];
135 
136                 input_report_key(data->input_dev, BTN_TOUCH, 1);
137                 input_report_abs(data->input_dev, ABS_X, x);
138                 input_report_abs(data->input_dev, ABS_Y, y);
139                 input_sync(data->input_dev);
140                 break;
141 
142         case INPUT_TYPE_DUAL:
143                 /* TODO */
144                 break;
145 
146         case INPUT_TYPE_PALM:
147                 /* TODO */
148                 break;
149 
150         case INPUT_TYPE_PROXIMITY:
151                 /* TODO */
152                 break;
153 
154         default:
155                 dev_err(&client->dev, "Unknown ts input type %d\n",
156                                 buffer[READ_INPUT_INFO]);
157                 break;
158         }
159 
160  out:
161         return IRQ_HANDLED;
162 }
163 
164 static void mcs5000_ts_phys_init(struct mcs5000_ts_data *data)
165 {
166         const struct mcs_platform_data *platform_data =
167                 data->platform_data;
168         struct i2c_client *client = data->client;
169 
170         /* Touch reset & sleep mode */
171         i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE,
172                         RESET_EXT_SOFT | OP_MODE_SLEEP);
173 
174         /* Touch size */
175         i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_UPPER,
176                         platform_data->x_size >> 8);
177         i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_LOWER,
178                         platform_data->x_size & 0xff);
179         i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_UPPER,
180                         platform_data->y_size >> 8);
181         i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_LOWER,
182                         platform_data->y_size & 0xff);
183 
184         /* Touch active mode & 80 report rate */
185         i2c_smbus_write_byte_data(data->client, MCS5000_TS_OP_MODE,
186                         OP_MODE_ACTIVE | REPORT_RATE_80);
187 }
188 
189 static int mcs5000_ts_probe(struct i2c_client *client,
190                 const struct i2c_device_id *id)
191 {
192         struct mcs5000_ts_data *data;
193         struct input_dev *input_dev;
194         int ret;
195 
196         if (!dev_get_platdata(&client->dev))
197                 return -EINVAL;
198 
199         data = kzalloc(sizeof(struct mcs5000_ts_data), GFP_KERNEL);
200         input_dev = input_allocate_device();
201         if (!data || !input_dev) {
202                 dev_err(&client->dev, "Failed to allocate memory\n");
203                 ret = -ENOMEM;
204                 goto err_free_mem;
205         }
206 
207         data->client = client;
208         data->input_dev = input_dev;
209         data->platform_data = dev_get_platdata(&client->dev);
210 
211         input_dev->name = "MELPAS MCS-5000 Touchscreen";
212         input_dev->id.bustype = BUS_I2C;
213         input_dev->dev.parent = &client->dev;
214 
215         __set_bit(EV_ABS, input_dev->evbit);
216         __set_bit(EV_KEY, input_dev->evbit);
217         __set_bit(BTN_TOUCH, input_dev->keybit);
218         input_set_abs_params(input_dev, ABS_X, 0, MCS5000_MAX_XC, 0, 0);
219         input_set_abs_params(input_dev, ABS_Y, 0, MCS5000_MAX_YC, 0, 0);
220 
221         input_set_drvdata(input_dev, data);
222 
223         if (data->platform_data->cfg_pin)
224                 data->platform_data->cfg_pin();
225 
226         ret = request_threaded_irq(client->irq, NULL, mcs5000_ts_interrupt,
227                         IRQF_TRIGGER_LOW | IRQF_ONESHOT, "mcs5000_ts", data);
228 
229         if (ret < 0) {
230                 dev_err(&client->dev, "Failed to register interrupt\n");
231                 goto err_free_mem;
232         }
233 
234         ret = input_register_device(data->input_dev);
235         if (ret < 0)
236                 goto err_free_irq;
237 
238         mcs5000_ts_phys_init(data);
239         i2c_set_clientdata(client, data);
240 
241         return 0;
242 
243 err_free_irq:
244         free_irq(client->irq, data);
245 err_free_mem:
246         input_free_device(input_dev);
247         kfree(data);
248         return ret;
249 }
250 
251 static int mcs5000_ts_remove(struct i2c_client *client)
252 {
253         struct mcs5000_ts_data *data = i2c_get_clientdata(client);
254 
255         free_irq(client->irq, data);
256         input_unregister_device(data->input_dev);
257         kfree(data);
258 
259         return 0;
260 }
261 
262 #ifdef CONFIG_PM
263 static int mcs5000_ts_suspend(struct device *dev)
264 {
265         struct i2c_client *client = to_i2c_client(dev);
266 
267         /* Touch sleep mode */
268         i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, OP_MODE_SLEEP);
269 
270         return 0;
271 }
272 
273 static int mcs5000_ts_resume(struct device *dev)
274 {
275         struct i2c_client *client = to_i2c_client(dev);
276         struct mcs5000_ts_data *data = i2c_get_clientdata(client);
277 
278         mcs5000_ts_phys_init(data);
279 
280         return 0;
281 }
282 
283 static SIMPLE_DEV_PM_OPS(mcs5000_ts_pm, mcs5000_ts_suspend, mcs5000_ts_resume);
284 #endif
285 
286 static const struct i2c_device_id mcs5000_ts_id[] = {
287         { "mcs5000_ts", 0 },
288         { }
289 };
290 MODULE_DEVICE_TABLE(i2c, mcs5000_ts_id);
291 
292 static struct i2c_driver mcs5000_ts_driver = {
293         .probe          = mcs5000_ts_probe,
294         .remove         = mcs5000_ts_remove,
295         .driver = {
296                 .name = "mcs5000_ts",
297 #ifdef CONFIG_PM
298                 .pm   = &mcs5000_ts_pm,
299 #endif
300         },
301         .id_table       = mcs5000_ts_id,
302 };
303 
304 module_i2c_driver(mcs5000_ts_driver);
305 
306 /* Module information */
307 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
308 MODULE_DESCRIPTION("Touchscreen driver for MELFAS MCS-5000 controller");
309 MODULE_LICENSE("GPL");
310 

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