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/init.h>
16 #include <linux/i2c.h>
17 #include <linux/i2c/mcs.h>
18 #include <linux/interrupt.h>
19 #include <linux/input.h>
20 #include <linux/irq.h>
21 #include <linux/slab.h>
24 /* MCS5000 Touchkey */
25 #define MCS5000_TOUCHKEY_STATUS 0x04
26 #define MCS5000_TOUCHKEY_STATUS_PRESS 7
27 #define MCS5000_TOUCHKEY_FW 0x0a
28 #define MCS5000_TOUCHKEY_BASE_VAL 0x61
30 /* MCS5080 Touchkey */
31 #define MCS5080_TOUCHKEY_STATUS 0x00
32 #define MCS5080_TOUCHKEY_STATUS_PRESS 3
33 #define MCS5080_TOUCHKEY_FW 0x01
34 #define MCS5080_TOUCHKEY_BASE_VAL 0x1
36 enum mcs_touchkey_type {
41 struct mcs_touchkey_chip {
42 unsigned int status_reg;
43 unsigned int pressbit;
44 unsigned int press_invert;
48 struct mcs_touchkey_data {
49 void (*poweron)(bool);
51 struct i2c_client *client;
52 struct input_dev *input_dev;
53 struct mcs_touchkey_chip chip;
54 unsigned int key_code;
56 unsigned short keycodes[];
59 static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id)
61 struct mcs_touchkey_data *data = dev_id;
62 struct mcs_touchkey_chip *chip = &data->chip;
63 struct i2c_client *client = data->client;
64 struct input_dev *input = data->input_dev;
69 val = i2c_smbus_read_byte_data(client, chip->status_reg);
71 dev_err(&client->dev, "i2c read error [%d]\n", val);
75 pressed = (val & (1 << chip->pressbit)) >> chip->pressbit;
76 if (chip->press_invert)
77 pressed ^= chip->press_invert;
79 /* key_val is 0 when released, so we should use key_val of press. */
81 key_val = val & (0xff >> (8 - chip->pressbit));
84 key_val -= chip->baseval;
85 data->key_code = data->keycodes[key_val];
86 data->key_val = key_val;
89 input_event(input, EV_MSC, MSC_SCAN, data->key_val);
90 input_report_key(input, data->key_code, pressed);
93 dev_dbg(&client->dev, "key %d %d %s\n", data->key_val, data->key_code,
94 pressed ? "pressed" : "released");
100 static int __devinit mcs_touchkey_probe(struct i2c_client *client,
101 const struct i2c_device_id *id)
103 const struct mcs_platform_data *pdata;
104 struct mcs_touchkey_data *data;
105 struct input_dev *input_dev;
111 pdata = client->dev.platform_data;
113 dev_err(&client->dev, "no platform data defined\n");
117 data = kzalloc(sizeof(struct mcs_touchkey_data) +
118 sizeof(data->keycodes[0]) * (pdata->key_maxval + 1),
120 input_dev = input_allocate_device();
121 if (!data || !input_dev) {
122 dev_err(&client->dev, "Failed to allocate memory\n");
127 data->client = client;
128 data->input_dev = input_dev;
130 if (id->driver_data == MCS5000_TOUCHKEY) {
131 data->chip.status_reg = MCS5000_TOUCHKEY_STATUS;
132 data->chip.pressbit = MCS5000_TOUCHKEY_STATUS_PRESS;
133 data->chip.baseval = MCS5000_TOUCHKEY_BASE_VAL;
134 fw_reg = MCS5000_TOUCHKEY_FW;
136 data->chip.status_reg = MCS5080_TOUCHKEY_STATUS;
137 data->chip.pressbit = MCS5080_TOUCHKEY_STATUS_PRESS;
138 data->chip.press_invert = 1;
139 data->chip.baseval = MCS5080_TOUCHKEY_BASE_VAL;
140 fw_reg = MCS5080_TOUCHKEY_FW;
143 fw_ver = i2c_smbus_read_byte_data(client, fw_reg);
146 dev_err(&client->dev, "i2c read error[%d]\n", error);
149 dev_info(&client->dev, "Firmware version: %d\n", fw_ver);
151 input_dev->name = "MELPAS MCS Touchkey";
152 input_dev->id.bustype = BUS_I2C;
153 input_dev->dev.parent = &client->dev;
154 input_dev->evbit[0] = BIT_MASK(EV_KEY);
155 if (!pdata->no_autorepeat)
156 input_dev->evbit[0] |= BIT_MASK(EV_REP);
157 input_dev->keycode = data->keycodes;
158 input_dev->keycodesize = sizeof(data->keycodes[0]);
159 input_dev->keycodemax = pdata->key_maxval + 1;
161 for (i = 0; i < pdata->keymap_size; i++) {
162 unsigned int val = MCS_KEY_VAL(pdata->keymap[i]);
163 unsigned int code = MCS_KEY_CODE(pdata->keymap[i]);
165 data->keycodes[val] = code;
166 __set_bit(code, input_dev->keybit);
169 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
170 input_set_drvdata(input_dev, data);
175 if (pdata->poweron) {
176 data->poweron = pdata->poweron;
180 error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt,
181 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
182 client->dev.driver->name, data);
184 dev_err(&client->dev, "Failed to register interrupt\n");
188 error = input_register_device(input_dev);
192 i2c_set_clientdata(client, data);
196 free_irq(client->irq, data);
198 input_free_device(input_dev);
203 static int __devexit mcs_touchkey_remove(struct i2c_client *client)
205 struct mcs_touchkey_data *data = i2c_get_clientdata(client);
207 free_irq(client->irq, data);
209 data->poweron(false);
210 input_unregister_device(data->input_dev);
216 static void mcs_touchkey_shutdown(struct i2c_client *client)
218 struct mcs_touchkey_data *data = i2c_get_clientdata(client);
221 data->poweron(false);
224 #ifdef CONFIG_PM_SLEEP
225 static int mcs_touchkey_suspend(struct device *dev)
227 struct mcs_touchkey_data *data = dev_get_drvdata(dev);
228 struct i2c_client *client = data->client;
230 /* Disable the work */
231 disable_irq(client->irq);
233 /* Finally turn off the power */
235 data->poweron(false);
240 static int mcs_touchkey_resume(struct device *dev)
242 struct mcs_touchkey_data *data = dev_get_drvdata(dev);
243 struct i2c_client *client = data->client;
245 /* Enable the device first */
249 /* Enable irq again */
250 enable_irq(client->irq);
256 static SIMPLE_DEV_PM_OPS(mcs_touchkey_pm_ops,
257 mcs_touchkey_suspend, mcs_touchkey_resume);
259 static const struct i2c_device_id mcs_touchkey_id[] = {
260 { "mcs5000_touchkey", MCS5000_TOUCHKEY },
261 { "mcs5080_touchkey", MCS5080_TOUCHKEY },
264 MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id);
266 static struct i2c_driver mcs_touchkey_driver = {
268 .name = "mcs_touchkey",
269 .owner = THIS_MODULE,
270 .pm = &mcs_touchkey_pm_ops,
272 .probe = mcs_touchkey_probe,
273 .remove = mcs_touchkey_remove,
274 .shutdown = mcs_touchkey_shutdown,
275 .id_table = mcs_touchkey_id,
278 module_i2c_driver(mcs_touchkey_driver);
280 /* Module information */
281 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
282 MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>");
283 MODULE_DESCRIPTION("Touchkey driver for MELFAS MCS5000/5080 controller");
284 MODULE_LICENSE("GPL");