1/*
2 * Touchkey driver for MELFAS MCS5000/5080 controller
3 *
4 * Copyright (C) 2010 Samsung Electronics Co.Ltd
5 * Author: HeungJun Kim <riverful.kim@samsung.com>
6 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14#include <linux/module.h>
15#include <linux/i2c.h>
16#include <linux/interrupt.h>
17#include <linux/input.h>
18#include <linux/irq.h>
19#include <linux/slab.h>
20#include <linux/platform_data/mcs.h>
21#include <linux/pm.h>
22
23/* MCS5000 Touchkey */
24#define MCS5000_TOUCHKEY_STATUS 0x04
25#define MCS5000_TOUCHKEY_STATUS_PRESS 7
26#define MCS5000_TOUCHKEY_FW 0x0a
27#define MCS5000_TOUCHKEY_BASE_VAL 0x61
28
29/* MCS5080 Touchkey */
30#define MCS5080_TOUCHKEY_STATUS 0x00
31#define MCS5080_TOUCHKEY_STATUS_PRESS 3
32#define MCS5080_TOUCHKEY_FW 0x01
33#define MCS5080_TOUCHKEY_BASE_VAL 0x1
34
35enum mcs_touchkey_type {
36 MCS5000_TOUCHKEY,
37 MCS5080_TOUCHKEY,
38};
39
40struct mcs_touchkey_chip {
41 unsigned int status_reg;
42 unsigned int pressbit;
43 unsigned int press_invert;
44 unsigned int baseval;
45};
46
47struct mcs_touchkey_data {
48 void (*poweron)(bool);
49
50 struct i2c_client *client;
51 struct input_dev *input_dev;
52 struct mcs_touchkey_chip chip;
53 unsigned int key_code;
54 unsigned int key_val;
55 unsigned short keycodes[];
56};
57
58static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id)
59{
60 struct mcs_touchkey_data *data = dev_id;
61 struct mcs_touchkey_chip *chip = &data->chip;
62 struct i2c_client *client = data->client;
63 struct input_dev *input = data->input_dev;
64 unsigned int key_val;
65 unsigned int pressed;
66 int val;
67
68 val = i2c_smbus_read_byte_data(client, chip->status_reg);
69 if (val < 0) {
70 dev_err(&client->dev, "i2c read error [%d]\n", val);
71 goto out;
72 }
73
74 pressed = (val & (1 << chip->pressbit)) >> chip->pressbit;
75 if (chip->press_invert)
76 pressed ^= chip->press_invert;
77
78 /* key_val is 0 when released, so we should use key_val of press. */
79 if (pressed) {
80 key_val = val & (0xff >> (8 - chip->pressbit));
81 if (!key_val)
82 goto out;
83 key_val -= chip->baseval;
84 data->key_code = data->keycodes[key_val];
85 data->key_val = key_val;
86 }
87
88 input_event(input, EV_MSC, MSC_SCAN, data->key_val);
89 input_report_key(input, data->key_code, pressed);
90 input_sync(input);
91
92 dev_dbg(&client->dev, "key %d %d %s\n", data->key_val, data->key_code,
93 pressed ? "pressed" : "released");
94
95 out:
96 return IRQ_HANDLED;
97}
98
99static int mcs_touchkey_probe(struct i2c_client *client,
100 const struct i2c_device_id *id)
101{
102 const struct mcs_platform_data *pdata;
103 struct mcs_touchkey_data *data;
104 struct input_dev *input_dev;
105 unsigned int fw_reg;
106 int fw_ver;
107 int error;
108 int i;
109
110 pdata = dev_get_platdata(&client->dev);
111 if (!pdata) {
112 dev_err(&client->dev, "no platform data defined\n");
113 return -EINVAL;
114 }
115
116 data = kzalloc(struct_size(data, keycodes, pdata->key_maxval + 1),
117 GFP_KERNEL);
118 input_dev = input_allocate_device();
119 if (!data || !input_dev) {
120 dev_err(&client->dev, "Failed to allocate memory\n");
121 error = -ENOMEM;
122 goto err_free_mem;
123 }
124
125 data->client = client;
126 data->input_dev = input_dev;
127
128 if (id->driver_data == MCS5000_TOUCHKEY) {
129 data->chip.status_reg = MCS5000_TOUCHKEY_STATUS;
130 data->chip.pressbit = MCS5000_TOUCHKEY_STATUS_PRESS;
131 data->chip.baseval = MCS5000_TOUCHKEY_BASE_VAL;
132 fw_reg = MCS5000_TOUCHKEY_FW;
133 } else {
134 data->chip.status_reg = MCS5080_TOUCHKEY_STATUS;
135 data->chip.pressbit = MCS5080_TOUCHKEY_STATUS_PRESS;
136 data->chip.press_invert = 1;
137 data->chip.baseval = MCS5080_TOUCHKEY_BASE_VAL;
138 fw_reg = MCS5080_TOUCHKEY_FW;
139 }
140
141 fw_ver = i2c_smbus_read_byte_data(client, fw_reg);
142 if (fw_ver < 0) {
143 error = fw_ver;
144 dev_err(&client->dev, "i2c read error[%d]\n", error);
145 goto err_free_mem;
146 }
147 dev_info(&client->dev, "Firmware version: %d\n", fw_ver);
148
149 input_dev->name = "MELFAS MCS Touchkey";
150 input_dev->id.bustype = BUS_I2C;
151 input_dev->dev.parent = &client->dev;
152 input_dev->evbit[0] = BIT_MASK(EV_KEY);
153 if (!pdata->no_autorepeat)
154 input_dev->evbit[0] |= BIT_MASK(EV_REP);
155 input_dev->keycode = data->keycodes;
156 input_dev->keycodesize = sizeof(data->keycodes[0]);
157 input_dev->keycodemax = pdata->key_maxval + 1;
158
159 for (i = 0; i < pdata->keymap_size; i++) {
160 unsigned int val = MCS_KEY_VAL(pdata->keymap[i]);
161 unsigned int code = MCS_KEY_CODE(pdata->keymap[i]);
162
163 data->keycodes[val] = code;
164 __set_bit(code, input_dev->keybit);
165 }
166
167 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
168 input_set_drvdata(input_dev, data);
169
170 if (pdata->cfg_pin)
171 pdata->cfg_pin();
172
173 if (pdata->poweron) {
174 data->poweron = pdata->poweron;
175 data->poweron(true);
176 }
177
178 error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt,
179 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
180 client->dev.driver->name, data);
181 if (error) {
182 dev_err(&client->dev, "Failed to register interrupt\n");
183 goto err_free_mem;
184 }
185
186 error = input_register_device(input_dev);
187 if (error)
188 goto err_free_irq;
189
190 i2c_set_clientdata(client, data);
191 return 0;
192
193err_free_irq:
194 free_irq(client->irq, data);
195err_free_mem:
196 input_free_device(input_dev);
197 kfree(data);
198 return error;
199}
200
201static int mcs_touchkey_remove(struct i2c_client *client)
202{
203 struct mcs_touchkey_data *data = i2c_get_clientdata(client);
204
205 free_irq(client->irq, data);
206 if (data->poweron)
207 data->poweron(false);
208 input_unregister_device(data->input_dev);
209 kfree(data);
210
211 return 0;
212}
213
214static void mcs_touchkey_shutdown(struct i2c_client *client)
215{
216 struct mcs_touchkey_data *data = i2c_get_clientdata(client);
217
218 if (data->poweron)
219 data->poweron(false);
220}
221
222#ifdef CONFIG_PM_SLEEP
223static int mcs_touchkey_suspend(struct device *dev)
224{
225 struct mcs_touchkey_data *data = dev_get_drvdata(dev);
226 struct i2c_client *client = data->client;
227
228 /* Disable the work */
229 disable_irq(client->irq);
230
231 /* Finally turn off the power */
232 if (data->poweron)
233 data->poweron(false);
234
235 return 0;
236}
237
238static int mcs_touchkey_resume(struct device *dev)
239{
240 struct mcs_touchkey_data *data = dev_get_drvdata(dev);
241 struct i2c_client *client = data->client;
242
243 /* Enable the device first */
244 if (data->poweron)
245 data->poweron(true);
246
247 /* Enable irq again */
248 enable_irq(client->irq);
249
250 return 0;
251}
252#endif
253
254static SIMPLE_DEV_PM_OPS(mcs_touchkey_pm_ops,
255 mcs_touchkey_suspend, mcs_touchkey_resume);
256
257static const struct i2c_device_id mcs_touchkey_id[] = {
258 { "mcs5000_touchkey", MCS5000_TOUCHKEY },
259 { "mcs5080_touchkey", MCS5080_TOUCHKEY },
260 { }
261};
262MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id);
263
264static struct i2c_driver mcs_touchkey_driver = {
265 .driver = {
266 .name = "mcs_touchkey",
267 .pm = &mcs_touchkey_pm_ops,
268 },
269 .probe = mcs_touchkey_probe,
270 .remove = mcs_touchkey_remove,
271 .shutdown = mcs_touchkey_shutdown,
272 .id_table = mcs_touchkey_id,
273};
274
275module_i2c_driver(mcs_touchkey_driver);
276
277/* Module information */
278MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
279MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>");
280MODULE_DESCRIPTION("Touchkey driver for MELFAS MCS5000/5080 controller");
281MODULE_LICENSE("GPL");
282