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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> | |
38e783b3 | 17 | #include <linux/i2c.h> |
312e8e8a | 18 | #include <linux/i2c/mcs.h> |
38e783b3 JS |
19 | #include <linux/interrupt.h> |
20 | #include <linux/input.h> | |
21 | #include <linux/irq.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
38e783b3 JS |
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; | |
312e8e8a | 107 | const struct mcs_platform_data *platform_data; |
38e783b3 JS |
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 | ||
f5189d07 BS |
164 | static void mcs5000_ts_phys_init(struct mcs5000_ts_data *data, |
165 | const struct mcs_platform_data *platform_data) | |
38e783b3 | 166 | { |
38e783b3 JS |
167 | struct i2c_client *client = data->client; |
168 | ||
169 | /* Touch reset & sleep mode */ | |
170 | i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, | |
171 | RESET_EXT_SOFT | OP_MODE_SLEEP); | |
172 | ||
173 | /* Touch size */ | |
174 | i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_UPPER, | |
175 | platform_data->x_size >> 8); | |
176 | i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_LOWER, | |
177 | platform_data->x_size & 0xff); | |
178 | i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_UPPER, | |
179 | platform_data->y_size >> 8); | |
180 | i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_LOWER, | |
181 | platform_data->y_size & 0xff); | |
182 | ||
183 | /* Touch active mode & 80 report rate */ | |
184 | i2c_smbus_write_byte_data(data->client, MCS5000_TS_OP_MODE, | |
185 | OP_MODE_ACTIVE | REPORT_RATE_80); | |
186 | } | |
187 | ||
5298cc4c | 188 | static int mcs5000_ts_probe(struct i2c_client *client, |
f5189d07 | 189 | const struct i2c_device_id *id) |
38e783b3 | 190 | { |
f5189d07 | 191 | const struct mcs_platform_data *pdata; |
38e783b3 JS |
192 | struct mcs5000_ts_data *data; |
193 | struct input_dev *input_dev; | |
f5189d07 | 194 | int error; |
38e783b3 | 195 | |
f5189d07 BS |
196 | pdata = dev_get_platdata(&client->dev); |
197 | if (!pdata) | |
38e783b3 JS |
198 | return -EINVAL; |
199 | ||
f5189d07 BS |
200 | data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); |
201 | if (!data) { | |
38e783b3 | 202 | dev_err(&client->dev, "Failed to allocate memory\n"); |
f5189d07 | 203 | return -ENOMEM; |
38e783b3 JS |
204 | } |
205 | ||
206 | data->client = client; | |
f5189d07 BS |
207 | |
208 | input_dev = devm_input_allocate_device(&client->dev); | |
209 | if (!input_dev) { | |
210 | dev_err(&client->dev, "Failed to allocate input device\n"); | |
211 | return -ENOMEM; | |
212 | } | |
38e783b3 | 213 | |
21d128a7 | 214 | input_dev->name = "MELFAS MCS-5000 Touchscreen"; |
38e783b3 JS |
215 | input_dev->id.bustype = BUS_I2C; |
216 | input_dev->dev.parent = &client->dev; | |
217 | ||
218 | __set_bit(EV_ABS, input_dev->evbit); | |
219 | __set_bit(EV_KEY, input_dev->evbit); | |
220 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
221 | input_set_abs_params(input_dev, ABS_X, 0, MCS5000_MAX_XC, 0, 0); | |
222 | input_set_abs_params(input_dev, ABS_Y, 0, MCS5000_MAX_YC, 0, 0); | |
223 | ||
224 | input_set_drvdata(input_dev, data); | |
f5189d07 | 225 | data->input_dev = input_dev; |
38e783b3 | 226 | |
f5189d07 BS |
227 | if (pdata->cfg_pin) |
228 | pdata->cfg_pin(); | |
38e783b3 | 229 | |
f5189d07 BS |
230 | error = devm_request_threaded_irq(&client->dev, client->irq, |
231 | NULL, mcs5000_ts_interrupt, | |
232 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
233 | "mcs5000_ts", data); | |
234 | if (error) { | |
38e783b3 | 235 | dev_err(&client->dev, "Failed to register interrupt\n"); |
f5189d07 | 236 | return error; |
38e783b3 JS |
237 | } |
238 | ||
f5189d07 BS |
239 | error = input_register_device(data->input_dev); |
240 | if (error) { | |
241 | dev_err(&client->dev, "Failed to register input device\n"); | |
242 | return error; | |
243 | } | |
38e783b3 | 244 | |
f5189d07 | 245 | mcs5000_ts_phys_init(data, pdata); |
38e783b3 JS |
246 | i2c_set_clientdata(client, data); |
247 | ||
38e783b3 JS |
248 | return 0; |
249 | } | |
250 | ||
9634c152 | 251 | static int __maybe_unused mcs5000_ts_suspend(struct device *dev) |
38e783b3 | 252 | { |
92b672e2 MB |
253 | struct i2c_client *client = to_i2c_client(dev); |
254 | ||
38e783b3 JS |
255 | /* Touch sleep mode */ |
256 | i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, OP_MODE_SLEEP); | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
9634c152 | 261 | static int __maybe_unused mcs5000_ts_resume(struct device *dev) |
38e783b3 | 262 | { |
92b672e2 | 263 | struct i2c_client *client = to_i2c_client(dev); |
38e783b3 | 264 | struct mcs5000_ts_data *data = i2c_get_clientdata(client); |
f5189d07 | 265 | const struct mcs_platform_data *pdata = dev_get_platdata(dev); |
38e783b3 | 266 | |
f5189d07 | 267 | mcs5000_ts_phys_init(data, pdata); |
38e783b3 JS |
268 | |
269 | return 0; | |
270 | } | |
92b672e2 MB |
271 | |
272 | static SIMPLE_DEV_PM_OPS(mcs5000_ts_pm, mcs5000_ts_suspend, mcs5000_ts_resume); | |
38e783b3 JS |
273 | |
274 | static const struct i2c_device_id mcs5000_ts_id[] = { | |
275 | { "mcs5000_ts", 0 }, | |
276 | { } | |
277 | }; | |
278 | MODULE_DEVICE_TABLE(i2c, mcs5000_ts_id); | |
279 | ||
280 | static struct i2c_driver mcs5000_ts_driver = { | |
281 | .probe = mcs5000_ts_probe, | |
38e783b3 JS |
282 | .driver = { |
283 | .name = "mcs5000_ts", | |
92b672e2 | 284 | .pm = &mcs5000_ts_pm, |
38e783b3 JS |
285 | }, |
286 | .id_table = mcs5000_ts_id, | |
287 | }; | |
288 | ||
1b92c1cf | 289 | module_i2c_driver(mcs5000_ts_driver); |
38e783b3 JS |
290 | |
291 | /* Module information */ | |
292 | MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); | |
293 | MODULE_DESCRIPTION("Touchscreen driver for MELFAS MCS-5000 controller"); | |
294 | MODULE_LICENSE("GPL"); |