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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
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
92#define MCS5000_MAX_XC 0x3ff
93#define MCS5000_MAX_YC 0x3ff
94
95enum 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
105struct mcs5000_ts_data {
106 struct i2c_client *client;
107 struct input_dev *input_dev;
108 const struct mcs_platform_data *platform_data;
109};
110
111static 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
145 break;
146
147 case INPUT_TYPE_PALM:
148
149 break;
150
151 case INPUT_TYPE_PROXIMITY:
152
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
165static 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
172 i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE,
173 RESET_EXT_SOFT | OP_MODE_SLEEP);
174
175
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
186 i2c_smbus_write_byte_data(data->client, MCS5000_TS_OP_MODE,
187 OP_MODE_ACTIVE | REPORT_RATE_80);
188}
189
190static int __devinit 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
244err_free_irq:
245 free_irq(client->irq, data);
246err_free_mem:
247 input_free_device(input_dev);
248 kfree(data);
249 return ret;
250}
251
252static int __devexit 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
264static int mcs5000_ts_suspend(struct device *dev)
265{
266 struct i2c_client *client = to_i2c_client(dev);
267
268
269 i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, OP_MODE_SLEEP);
270
271 return 0;
272}
273
274static 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
284static SIMPLE_DEV_PM_OPS(mcs5000_ts_pm, mcs5000_ts_suspend, mcs5000_ts_resume);
285#endif
286
287static const struct i2c_device_id mcs5000_ts_id[] = {
288 { "mcs5000_ts", 0 },
289 { }
290};
291MODULE_DEVICE_TABLE(i2c, mcs5000_ts_id);
292
293static struct i2c_driver mcs5000_ts_driver = {
294 .probe = mcs5000_ts_probe,
295 .remove = __devexit_p(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
305static int __init mcs5000_ts_init(void)
306{
307 return i2c_add_driver(&mcs5000_ts_driver);
308}
309
310static void __exit mcs5000_ts_exit(void)
311{
312 i2c_del_driver(&mcs5000_ts_driver);
313}
314
315module_init(mcs5000_ts_init);
316module_exit(mcs5000_ts_exit);
317
318
319MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
320MODULE_DESCRIPTION("Touchscreen driver for MELFAS MCS-5000 controller");
321MODULE_LICENSE("GPL");
322
