2 * Touchkey driver for MELFAS MCS5000/5080 controller
4 * Copyright (C) 2010 Samsung Electronics Co.Ltd
5 * Author: HeungJun Kim <riverful.kim@samsung.com>
6 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
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.
14 #include <linux/module.h>
15 #include <linux/i2c.h>
16 #include <linux/i2c/mcs.h>
17 #include <linux/interrupt.h>
18 #include <linux/input.h>
19 #include <linux/irq.h>
20 #include <linux/slab.h>
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
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
35 enum mcs_touchkey_type {
40 struct mcs_touchkey_chip {
41 unsigned int status_reg;
42 unsigned int pressbit;
43 unsigned int press_invert;
47 struct mcs_touchkey_data {
48 void (*poweron)(bool);
50 struct i2c_client *client;
51 struct input_dev *input_dev;
52 struct mcs_touchkey_chip chip;
53 unsigned int key_code;
55 unsigned short keycodes[];
58 static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id)
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;
68 val = i2c_smbus_read_byte_data(client, chip->status_reg);
70 dev_err(&client->dev, "i2c read error [%d]\n", val);
74 pressed = (val & (1 << chip->pressbit)) >> chip->pressbit;
75 if (chip->press_invert)
76 pressed ^= chip->press_invert;
78 /* key_val is 0 when released, so we should use key_val of press. */
80 key_val = val & (0xff >> (8 - chip->pressbit));
83 key_val -= chip->baseval;
84 data->key_code = data->keycodes[key_val];
85 data->key_val = key_val;
88 input_event(input, EV_MSC, MSC_SCAN, data->key_val);
89 input_report_key(input, data->key_code, pressed);
92 dev_dbg(&client->dev, "key %d %d %s\n", data->key_val, data->key_code,
93 pressed ? "pressed" : "released");
99 static int mcs_touchkey_probe(struct i2c_client *client,
100 const struct i2c_device_id *id)
102 const struct mcs_platform_data *pdata;
103 struct mcs_touchkey_data *data;
104 struct input_dev *input_dev;
110 pdata = dev_get_platdata(&client->dev);
112 dev_err(&client->dev, "no platform data defined\n");
116 data = kzalloc(sizeof(struct mcs_touchkey_data) +
117 sizeof(data->keycodes[0]) * (pdata->key_maxval + 1),
119 input_dev = input_allocate_device();
120 if (!data || !input_dev) {
121 dev_err(&client->dev, "Failed to allocate memory\n");
126 data->client = client;
127 data->input_dev = input_dev;
129 if (id->driver_data == MCS5000_TOUCHKEY) {
130 data->chip.status_reg = MCS5000_TOUCHKEY_STATUS;
131 data->chip.pressbit = MCS5000_TOUCHKEY_STATUS_PRESS;
132 data->chip.baseval = MCS5000_TOUCHKEY_BASE_VAL;
133 fw_reg = MCS5000_TOUCHKEY_FW;
135 data->chip.status_reg = MCS5080_TOUCHKEY_STATUS;
136 data->chip.pressbit = MCS5080_TOUCHKEY_STATUS_PRESS;
137 data->chip.press_invert = 1;
138 data->chip.baseval = MCS5080_TOUCHKEY_BASE_VAL;
139 fw_reg = MCS5080_TOUCHKEY_FW;
142 fw_ver = i2c_smbus_read_byte_data(client, fw_reg);
145 dev_err(&client->dev, "i2c read error[%d]\n", error);
148 dev_info(&client->dev, "Firmware version: %d\n", fw_ver);
150 input_dev->name = "MELPAS MCS Touchkey";
151 input_dev->id.bustype = BUS_I2C;
152 input_dev->dev.parent = &client->dev;
153 input_dev->evbit[0] = BIT_MASK(EV_KEY);
154 if (!pdata->no_autorepeat)
155 input_dev->evbit[0] |= BIT_MASK(EV_REP);
156 input_dev->keycode = data->keycodes;
157 input_dev->keycodesize = sizeof(data->keycodes[0]);
158 input_dev->keycodemax = pdata->key_maxval + 1;
160 for (i = 0; i < pdata->keymap_size; i++) {
161 unsigned int val = MCS_KEY_VAL(pdata->keymap[i]);
162 unsigned int code = MCS_KEY_CODE(pdata->keymap[i]);
164 data->keycodes[val] = code;
165 __set_bit(code, input_dev->keybit);
168 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
169 input_set_drvdata(input_dev, data);
174 if (pdata->poweron) {
175 data->poweron = pdata->poweron;
179 error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt,
180 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
181 client->dev.driver->name, data);
183 dev_err(&client->dev, "Failed to register interrupt\n");
187 error = input_register_device(input_dev);
191 i2c_set_clientdata(client, data);
195 free_irq(client->irq, data);
197 input_free_device(input_dev);
202 static int mcs_touchkey_remove(struct i2c_client *client)
204 struct mcs_touchkey_data *data = i2c_get_clientdata(client);
206 free_irq(client->irq, data);
208 data->poweron(false);
209 input_unregister_device(data->input_dev);
215 static void mcs_touchkey_shutdown(struct i2c_client *client)
217 struct mcs_touchkey_data *data = i2c_get_clientdata(client);
220 data->poweron(false);
223 #ifdef CONFIG_PM_SLEEP
224 static int mcs_touchkey_suspend(struct device *dev)
226 struct mcs_touchkey_data *data = dev_get_drvdata(dev);
227 struct i2c_client *client = data->client;
229 /* Disable the work */
230 disable_irq(client->irq);
232 /* Finally turn off the power */
234 data->poweron(false);
239 static int mcs_touchkey_resume(struct device *dev)
241 struct mcs_touchkey_data *data = dev_get_drvdata(dev);
242 struct i2c_client *client = data->client;
244 /* Enable the device first */
248 /* Enable irq again */
249 enable_irq(client->irq);
255 static SIMPLE_DEV_PM_OPS(mcs_touchkey_pm_ops,
256 mcs_touchkey_suspend, mcs_touchkey_resume);
258 static const struct i2c_device_id mcs_touchkey_id[] = {
259 { "mcs5000_touchkey", MCS5000_TOUCHKEY },
260 { "mcs5080_touchkey", MCS5080_TOUCHKEY },
263 MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id);
265 static struct i2c_driver mcs_touchkey_driver = {
267 .name = "mcs_touchkey",
268 .owner = THIS_MODULE,
269 .pm = &mcs_touchkey_pm_ops,
271 .probe = mcs_touchkey_probe,
272 .remove = mcs_touchkey_remove,
273 .shutdown = mcs_touchkey_shutdown,
274 .id_table = mcs_touchkey_id,
277 module_i2c_driver(mcs_touchkey_driver);
279 /* Module information */
280 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
281 MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>");
282 MODULE_DESCRIPTION("Touchkey driver for MELFAS MCS5000/5080 controller");
283 MODULE_LICENSE("GPL");