2 * mcs5000_ts.c - Touchscreen driver for MELFAS MCS-5000 controller
4 * Copyright (C) 2009 Samsung Electronics Co.Ltd
5 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
7 * Based on wm97xx-core.c
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.
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/i2c.h>
19 #include <linux/i2c/mcs5000_ts.h>
20 #include <linux/interrupt.h>
21 #include <linux/input.h>
22 #include <linux/irq.h>
23 #include <linux/slab.h>
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)
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)
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
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
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)
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
91 /* Touchscreen absolute values */
92 #define MCS5000_MAX_XC 0x3ff
93 #define MCS5000_MAX_YC 0x3ff
95 enum mcs5000_ts_read_offset {
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 mcs5000_ts_platform_data *platform_data;
111 static irqreturn_t mcs5000_ts_interrupt(int irq, void *dev_id)
113 struct mcs5000_ts_data *data = dev_id;
114 struct i2c_client *client = data->client;
115 u8 buffer[READ_BLOCK_SIZE];
120 err = i2c_smbus_read_i2c_block_data(client, MCS5000_TS_INPUT_INFO,
121 READ_BLOCK_SIZE, buffer);
123 dev_err(&client->dev, "%s, err[%d]\n", __func__, err);
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);
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];
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);
143 case INPUT_TYPE_DUAL:
147 case INPUT_TYPE_PALM:
151 case INPUT_TYPE_PROXIMITY:
156 dev_err(&client->dev, "Unknown ts input type %d\n",
157 buffer[READ_INPUT_INFO]);
165 static void mcs5000_ts_phys_init(struct mcs5000_ts_data *data)
167 const struct mcs5000_ts_platform_data *platform_data =
169 struct i2c_client *client = data->client;
171 /* Touch reset & sleep mode */
172 i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE,
173 RESET_EXT_SOFT | OP_MODE_SLEEP);
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);
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);
190 static int __devinit mcs5000_ts_probe(struct i2c_client *client,
191 const struct i2c_device_id *id)
193 struct mcs5000_ts_data *data;
194 struct input_dev *input_dev;
197 if (!client->dev.platform_data)
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");
208 data->client = client;
209 data->input_dev = input_dev;
210 data->platform_data = client->dev.platform_data;
212 input_dev->name = "MELPAS MCS-5000 Touchscreen";
213 input_dev->id.bustype = BUS_I2C;
214 input_dev->dev.parent = &client->dev;
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);
222 input_set_drvdata(input_dev, data);
224 if (data->platform_data->cfg_pin)
225 data->platform_data->cfg_pin();
227 ret = request_threaded_irq(client->irq, NULL, mcs5000_ts_interrupt,
228 IRQF_TRIGGER_LOW | IRQF_ONESHOT, "mcs5000_ts", data);
231 dev_err(&client->dev, "Failed to register interrupt\n");
235 ret = input_register_device(data->input_dev);
239 mcs5000_ts_phys_init(data);
240 i2c_set_clientdata(client, data);
245 free_irq(client->irq, data);
247 input_free_device(input_dev);
252 static int __devexit mcs5000_ts_remove(struct i2c_client *client)
254 struct mcs5000_ts_data *data = i2c_get_clientdata(client);
256 free_irq(client->irq, data);
257 input_unregister_device(data->input_dev);
259 i2c_set_clientdata(client, NULL);
265 static int mcs5000_ts_suspend(struct i2c_client *client, pm_message_t mesg)
267 /* Touch sleep mode */
268 i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, OP_MODE_SLEEP);
273 static int mcs5000_ts_resume(struct i2c_client *client)
275 struct mcs5000_ts_data *data = i2c_get_clientdata(client);
277 mcs5000_ts_phys_init(data);
282 #define mcs5000_ts_suspend NULL
283 #define mcs5000_ts_resume NULL
286 static const struct i2c_device_id mcs5000_ts_id[] = {
290 MODULE_DEVICE_TABLE(i2c, mcs5000_ts_id);
292 static struct i2c_driver mcs5000_ts_driver = {
293 .probe = mcs5000_ts_probe,
294 .remove = __devexit_p(mcs5000_ts_remove),
295 .suspend = mcs5000_ts_suspend,
296 .resume = mcs5000_ts_resume,
298 .name = "mcs5000_ts",
300 .id_table = mcs5000_ts_id,
303 static int __init mcs5000_ts_init(void)
305 return i2c_add_driver(&mcs5000_ts_driver);
308 static void __exit mcs5000_ts_exit(void)
310 i2c_del_driver(&mcs5000_ts_driver);
313 module_init(mcs5000_ts_init);
314 module_exit(mcs5000_ts_exit);
316 /* Module information */
317 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
318 MODULE_DESCRIPTION("Touchscreen driver for MELFAS MCS-5000 controller");
319 MODULE_LICENSE("GPL");