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/init.h>
 18 #include <linux/i2c.h>
 19 #include <linux/i2c/mcs.h>
 20 #include <linux/interrupt.h>
 21 #include <linux/input.h>
 22 #include <linux/irq.h>
 23 #include <linux/slab.h>
 24 
 25 /* Registers */
 26 #define MCS5000_TS_STATUS               0x00
 27 #define STATUS_OFFSET                   0
 28 #define STATUS_NO                       (0 << STATUS_OFFSET)
 29 #define STATUS_INIT                     (1 << STATUS_OFFSET)
 30 #define STATUS_SENSING                  (2 << STATUS_OFFSET)
 31 #define STATUS_COORD                    (3 << STATUS_OFFSET)
 32 #define STATUS_GESTURE                  (4 << STATUS_OFFSET)
 33 #define ERROR_OFFSET                    4
 34 #define ERROR_NO                        (0 << ERROR_OFFSET)
 35 #define ERROR_POWER_ON_RESET            (1 << ERROR_OFFSET)
 36 #define ERROR_INT_RESET                 (2 << ERROR_OFFSET)
 37 #define ERROR_EXT_RESET                 (3 << ERROR_OFFSET)
 38 #define ERROR_INVALID_REG_ADDRESS       (8 << ERROR_OFFSET)
 39 #define ERROR_INVALID_REG_VALUE         (9 << ERROR_OFFSET)
 40 
 41 #define MCS5000_TS_OP_MODE              0x01
 42 #define RESET_OFFSET                    0
 43 #define RESET_NO                        (0 << RESET_OFFSET)
 44 #define RESET_EXT_SOFT                  (1 << RESET_OFFSET)
 45 #define OP_MODE_OFFSET                  1
 46 #define OP_MODE_SLEEP                   (0 << OP_MODE_OFFSET)
 47 #define OP_MODE_ACTIVE                  (1 << OP_MODE_OFFSET)
 48 #define GESTURE_OFFSET                  4
 49 #define GESTURE_DISABLE                 (0 << GESTURE_OFFSET)
 50 #define GESTURE_ENABLE                  (1 << GESTURE_OFFSET)
 51 #define PROXIMITY_OFFSET                5
 52 #define PROXIMITY_DISABLE               (0 << PROXIMITY_OFFSET)
 53 #define PROXIMITY_ENABLE                (1 << PROXIMITY_OFFSET)
 54 #define SCAN_MODE_OFFSET                6
 55 #define SCAN_MODE_INTERRUPT             (0 << SCAN_MODE_OFFSET)
 56 #define SCAN_MODE_POLLING               (1 << SCAN_MODE_OFFSET)
 57 #define REPORT_RATE_OFFSET              7
 58 #define REPORT_RATE_40                  (0 << REPORT_RATE_OFFSET)
 59 #define REPORT_RATE_80                  (1 << REPORT_RATE_OFFSET)
 60 
 61 #define MCS5000_TS_SENS_CTL             0x02
 62 #define MCS5000_TS_FILTER_CTL           0x03
 63 #define PRI_FILTER_OFFSET               0
 64 #define SEC_FILTER_OFFSET               4
 65 
 66 #define MCS5000_TS_X_SIZE_UPPER         0x08
 67 #define MCS5000_TS_X_SIZE_LOWER         0x09
 68 #define MCS5000_TS_Y_SIZE_UPPER         0x0A
 69 #define MCS5000_TS_Y_SIZE_LOWER         0x0B
 70 
 71 #define MCS5000_TS_INPUT_INFO           0x10
 72 #define INPUT_TYPE_OFFSET               0
 73 #define INPUT_TYPE_NONTOUCH             (0 << INPUT_TYPE_OFFSET)
 74 #define INPUT_TYPE_SINGLE               (1 << INPUT_TYPE_OFFSET)
 75 #define INPUT_TYPE_DUAL                 (2 << INPUT_TYPE_OFFSET)
 76 #define INPUT_TYPE_PALM                 (3 << INPUT_TYPE_OFFSET)
 77 #define INPUT_TYPE_PROXIMITY            (7 << INPUT_TYPE_OFFSET)
 78 #define GESTURE_CODE_OFFSET             3
 79 #define GESTURE_CODE_NO                 (0 << GESTURE_CODE_OFFSET)
 80 
 81 #define MCS5000_TS_X_POS_UPPER          0x11
 82 #define MCS5000_TS_X_POS_LOWER          0x12
 83 #define MCS5000_TS_Y_POS_UPPER          0x13
 84 #define MCS5000_TS_Y_POS_LOWER          0x14
 85 #define MCS5000_TS_Z_POS                0x15
 86 #define MCS5000_TS_WIDTH                0x16
 87 #define MCS5000_TS_GESTURE_VAL          0x17
 88 #define MCS5000_TS_MODULE_REV           0x20
 89 #define MCS5000_TS_FIRMWARE_VER         0x21
 90 
 91 /* Touchscreen absolute values */
 92 #define MCS5000_MAX_XC                  0x3ff
 93 #define MCS5000_MAX_YC                  0x3ff
 94 
 95 enum mcs5000_ts_read_offset {
 96         READ_INPUT_INFO,
 97         READ_X_POS_UPPER,
 98         READ_X_POS_LOWER,
 99         READ_Y_POS_UPPER,
100         READ_Y_POS_LOWER,
101         READ_BLOCK_SIZE,
102 };
103 
104 /* Each client has this additional data */
105 struct mcs5000_ts_data {
106         struct i2c_client *client;
107         struct input_dev *input_dev;
108         const struct mcs_platform_data *platform_data;
109 };
110 
111 static irqreturn_t mcs5000_ts_interrupt(int irq, void *dev_id)
112 {
113         struct mcs5000_ts_data *data = dev_id;
114         struct i2c_client *client = data->client;
115         u8 buffer[READ_BLOCK_SIZE];
116         int err;
117         int x;
118         int y;
119 
120         err = i2c_smbus_read_i2c_block_data(client, MCS5000_TS_INPUT_INFO,
121                         READ_BLOCK_SIZE, buffer);
122         if (err < 0) {
123                 dev_err(&client->dev, "%s, err[%d]\n", __func__, err);
124                 goto out;
125         }
126 
127         switch (buffer[READ_INPUT_INFO]) {
128         case INPUT_TYPE_NONTOUCH:
129                 input_report_key(data->input_dev, BTN_TOUCH, 0);
130                 input_sync(data->input_dev);
131                 break;
132 
133         case INPUT_TYPE_SINGLE:
134                 x = (buffer[READ_X_POS_UPPER] << 8) | buffer[READ_X_POS_LOWER];
135                 y = (buffer[READ_Y_POS_UPPER] << 8) | buffer[READ_Y_POS_LOWER];
136 
137                 input_report_key(data->input_dev, BTN_TOUCH, 1);
138                 input_report_abs(data->input_dev, ABS_X, x);
139                 input_report_abs(data->input_dev, ABS_Y, y);
140                 input_sync(data->input_dev);
141                 break;
142 
143         case INPUT_TYPE_DUAL:
144                 /* TODO */
145                 break;
146 
147         case INPUT_TYPE_PALM:
148                 /* TODO */
149                 break;
150 
151         case INPUT_TYPE_PROXIMITY:
152                 /* TODO */
153                 break;
154 
155         default:
156                 dev_err(&client->dev, "Unknown ts input type %d\n",
157                                 buffer[READ_INPUT_INFO]);
158                 break;
159         }
160 
161  out:
162         return IRQ_HANDLED;
163 }
164 
165 static void mcs5000_ts_phys_init(struct mcs5000_ts_data *data)
166 {
167         const struct mcs_platform_data *platform_data =
168                 data->platform_data;
169         struct i2c_client *client = data->client;
170 
171         /* Touch reset & sleep mode */
172         i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE,
173                         RESET_EXT_SOFT | OP_MODE_SLEEP);
174 
175         /* Touch size */
176         i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_UPPER,
177                         platform_data->x_size >> 8);
178         i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_LOWER,
179                         platform_data->x_size & 0xff);
180         i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_UPPER,
181                         platform_data->y_size >> 8);
182         i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_LOWER,
183                         platform_data->y_size & 0xff);
184 
185         /* Touch active mode & 80 report rate */
186         i2c_smbus_write_byte_data(data->client, MCS5000_TS_OP_MODE,
187                         OP_MODE_ACTIVE | REPORT_RATE_80);
188 }
189 
190 static int mcs5000_ts_probe(struct i2c_client *client,
191                 const struct i2c_device_id *id)
192 {
193         struct mcs5000_ts_data *data;
194         struct input_dev *input_dev;
195         int ret;
196 
197         if (!client->dev.platform_data)
198                 return -EINVAL;
199 
200         data = kzalloc(sizeof(struct mcs5000_ts_data), GFP_KERNEL);
201         input_dev = input_allocate_device();
202         if (!data || !input_dev) {
203                 dev_err(&client->dev, "Failed to allocate memory\n");
204                 ret = -ENOMEM;
205                 goto err_free_mem;
206         }
207 
208         data->client = client;
209         data->input_dev = input_dev;
210         data->platform_data = client->dev.platform_data;
211 
212         input_dev->name = "MELPAS MCS-5000 Touchscreen";
213         input_dev->id.bustype = BUS_I2C;
214         input_dev->dev.parent = &client->dev;
215 
216         __set_bit(EV_ABS, input_dev->evbit);
217         __set_bit(EV_KEY, input_dev->evbit);
218         __set_bit(BTN_TOUCH, input_dev->keybit);
219         input_set_abs_params(input_dev, ABS_X, 0, MCS5000_MAX_XC, 0, 0);
220         input_set_abs_params(input_dev, ABS_Y, 0, MCS5000_MAX_YC, 0, 0);
221 
222         input_set_drvdata(input_dev, data);
223 
224         if (data->platform_data->cfg_pin)
225                 data->platform_data->cfg_pin();
226 
227         ret = request_threaded_irq(client->irq, NULL, mcs5000_ts_interrupt,
228                         IRQF_TRIGGER_LOW | IRQF_ONESHOT, "mcs5000_ts", data);
229 
230         if (ret < 0) {
231                 dev_err(&client->dev, "Failed to register interrupt\n");
232                 goto err_free_mem;
233         }
234 
235         ret = input_register_device(data->input_dev);
236         if (ret < 0)
237                 goto err_free_irq;
238 
239         mcs5000_ts_phys_init(data);
240         i2c_set_clientdata(client, data);
241 
242         return 0;
243 
244 err_free_irq:
245         free_irq(client->irq, data);
246 err_free_mem:
247         input_free_device(input_dev);
248         kfree(data);
249         return ret;
250 }
251 
252 static int mcs5000_ts_remove(struct i2c_client *client)
253 {
254         struct mcs5000_ts_data *data = i2c_get_clientdata(client);
255 
256         free_irq(client->irq, data);
257         input_unregister_device(data->input_dev);
258         kfree(data);
259 
260         return 0;
261 }
262 
263 #ifdef CONFIG_PM
264 static int mcs5000_ts_suspend(struct device *dev)
265 {
266         struct i2c_client *client = to_i2c_client(dev);
267 
268         /* Touch sleep mode */
269         i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, OP_MODE_SLEEP);
270 
271         return 0;
272 }
273 
274 static int mcs5000_ts_resume(struct device *dev)
275 {
276         struct i2c_client *client = to_i2c_client(dev);
277         struct mcs5000_ts_data *data = i2c_get_clientdata(client);
278 
279         mcs5000_ts_phys_init(data);
280 
281         return 0;
282 }
283 
284 static SIMPLE_DEV_PM_OPS(mcs5000_ts_pm, mcs5000_ts_suspend, mcs5000_ts_resume);
285 #endif
286 
287 static const struct i2c_device_id mcs5000_ts_id[] = {
288         { "mcs5000_ts", 0 },
289         { }
290 };
291 MODULE_DEVICE_TABLE(i2c, mcs5000_ts_id);
292 
293 static struct i2c_driver mcs5000_ts_driver = {
294         .probe          = mcs5000_ts_probe,
295         .remove         = mcs5000_ts_remove,
296         .driver = {
297                 .name = "mcs5000_ts",
298 #ifdef CONFIG_PM
299                 .pm   = &mcs5000_ts_pm,
300 #endif
301         },
302         .id_table       = mcs5000_ts_id,
303 };
304 
305 module_i2c_driver(mcs5000_ts_driver);
306 
307 /* Module information */
308 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
309 MODULE_DESCRIPTION("Touchscreen driver for MELFAS MCS-5000 controller");
310 MODULE_LICENSE("GPL");
311
This page was automatically generated by LXR 0.3.1 (source). • Linux is a registered trademark of Linus Torvalds
Linux Cross Reference

Free Electrons

Embedded Linux Experts

Linux/drivers/input/touchscreen/mcs5000_ts.c
