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38e783b3 JS |
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> | |
312e8e8a | 19 | #include <linux/i2c/mcs.h> |
38e783b3 JS |
20 | #include <linux/interrupt.h> |
21 | #include <linux/input.h> | |
22 | #include <linux/irq.h> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
38e783b3 JS |
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; | |
312e8e8a | 108 | const struct mcs_platform_data *platform_data; |
38e783b3 JS |
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 | { | |
312e8e8a | 167 | const struct mcs_platform_data *platform_data = |
38e783b3 JS |
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 __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 | ||
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 __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); | |
38e783b3 JS |
259 | |
260 | return 0; | |
261 | } | |
262 | ||
263 | #ifdef CONFIG_PM | |
92b672e2 | 264 | static int mcs5000_ts_suspend(struct device *dev) |
38e783b3 | 265 | { |
92b672e2 MB |
266 | struct i2c_client *client = to_i2c_client(dev); |
267 | ||
38e783b3 JS |
268 | /* Touch sleep mode */ |
269 | i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, OP_MODE_SLEEP); | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
92b672e2 | 274 | static int mcs5000_ts_resume(struct device *dev) |
38e783b3 | 275 | { |
92b672e2 | 276 | struct i2c_client *client = to_i2c_client(dev); |
38e783b3 JS |
277 | struct mcs5000_ts_data *data = i2c_get_clientdata(client); |
278 | ||
279 | mcs5000_ts_phys_init(data); | |
280 | ||
281 | return 0; | |
282 | } | |
92b672e2 MB |
283 | |
284 | static SIMPLE_DEV_PM_OPS(mcs5000_ts_pm, mcs5000_ts_suspend, mcs5000_ts_resume); | |
38e783b3 JS |
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 = __devexit_p(mcs5000_ts_remove), | |
38e783b3 JS |
296 | .driver = { |
297 | .name = "mcs5000_ts", | |
92b672e2 MB |
298 | #ifdef CONFIG_PM |
299 | .pm = &mcs5000_ts_pm, | |
300 | #endif | |
38e783b3 JS |
301 | }, |
302 | .id_table = mcs5000_ts_id, | |
303 | }; | |
304 | ||
305 | static int __init mcs5000_ts_init(void) | |
306 | { | |
307 | return i2c_add_driver(&mcs5000_ts_driver); | |
308 | } | |
309 | ||
310 | static void __exit mcs5000_ts_exit(void) | |
311 | { | |
312 | i2c_del_driver(&mcs5000_ts_driver); | |
313 | } | |
314 | ||
315 | module_init(mcs5000_ts_init); | |
316 | module_exit(mcs5000_ts_exit); | |
317 | ||
318 | /* Module information */ | |
319 | MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); | |
320 | MODULE_DESCRIPTION("Touchscreen driver for MELFAS MCS-5000 controller"); | |
321 | MODULE_LICENSE("GPL"); |