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/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>
22 #include <linux/pm.h>
23
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
29
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
35
36 enum mcs_touchkey_type {
37 MCS5000_TOUCHKEY,
38 MCS5080_TOUCHKEY,
39 };
40
41 struct mcs_touchkey_chip {
42 unsigned int status_reg;
43 unsigned int pressbit;
44 unsigned int press_invert;
45 unsigned int baseval;
46 };
47
48 struct mcs_touchkey_data {
49 void (*poweron)(bool);
50
51 struct i2c_client *client;
52 struct input_dev *input_dev;
53 struct mcs_touchkey_chip chip;
54 unsigned int key_code;
55 unsigned int key_val;
56 unsigned short keycodes[];
57 };
58
mcs_touchkey_interrupt(int irq,void * dev_id)59 static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id)
60 {
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;
65 unsigned int key_val;
66 unsigned int pressed;
67 int val;
68
69 val = i2c_smbus_read_byte_data(client, chip->status_reg);
70 if (val < 0) {
71 dev_err(&client->dev, "i2c read error [%d]\n", val);
72 goto out;
73 }
74
75 pressed = (val & (1 << chip->pressbit)) >> chip->pressbit;
76 if (chip->press_invert)
77 pressed ^= chip->press_invert;
78
79 /* key_val is 0 when released, so we should use key_val of press. */
80 if (pressed) {
81 key_val = val & (0xff >> (8 - chip->pressbit));
82 if (!key_val)
83 goto out;
84 key_val -= chip->baseval;
85 data->key_code = data->keycodes[key_val];
86 data->key_val = key_val;
87 }
88
89 input_event(input, EV_MSC, MSC_SCAN, data->key_val);
90 input_report_key(input, data->key_code, pressed);
91 input_sync(input);
92
93 dev_dbg(&client->dev, "key %d %d %s\n", data->key_val, data->key_code,
94 pressed ? "pressed" : "released");
95
96 out:
97 return IRQ_HANDLED;
98 }
99
mcs_touchkey_probe(struct i2c_client * client,const struct i2c_device_id * id)100 static int __devinit mcs_touchkey_probe(struct i2c_client *client,
101 const struct i2c_device_id *id)
102 {
103 const struct mcs_platform_data *pdata;
104 struct mcs_touchkey_data *data;
105 struct input_dev *input_dev;
106 unsigned int fw_reg;
107 int fw_ver;
108 int error;
109 int i;
110
111 pdata = client->dev.platform_data;
112 if (!pdata) {
113 dev_err(&client->dev, "no platform data defined\n");
114 return -EINVAL;
115 }
116
117 data = kzalloc(sizeof(struct mcs_touchkey_data) +
118 sizeof(data->keycodes[0]) * (pdata->key_maxval + 1),
119 GFP_KERNEL);
120 input_dev = input_allocate_device();
121 if (!data || !input_dev) {
122 dev_err(&client->dev, "Failed to allocate memory\n");
123 error = -ENOMEM;
124 goto err_free_mem;
125 }
126
127 data->client = client;
128 data->input_dev = input_dev;
129
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;
135 } else {
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;
141 }
142
143 fw_ver = i2c_smbus_read_byte_data(client, fw_reg);
144 if (fw_ver < 0) {
145 error = fw_ver;
146 dev_err(&client->dev, "i2c read error[%d]\n", error);
147 goto err_free_mem;
148 }
149 dev_info(&client->dev, "Firmware version: %d\n", fw_ver);
150
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;
160
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]);
164
165 data->keycodes[val] = code;
166 __set_bit(code, input_dev->keybit);
167 }
168
169 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
170 input_set_drvdata(input_dev, data);
171
172 if (pdata->cfg_pin)
173 pdata->cfg_pin();
174
175 if (pdata->poweron) {
176 data->poweron = pdata->poweron;
177 data->poweron(true);
178 }
179
180 error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt,
181 IRQF_TRIGGER_FALLING, client->dev.driver->name, data);
182 if (error) {
183 dev_err(&client->dev, "Failed to register interrupt\n");
184 goto err_free_mem;
185 }
186
187 error = input_register_device(input_dev);
188 if (error)
189 goto err_free_irq;
190
191 i2c_set_clientdata(client, data);
192 return 0;
193
194 err_free_irq:
195 free_irq(client->irq, data);
196 err_free_mem:
197 input_free_device(input_dev);
198 kfree(data);
199 return error;
200 }
201
mcs_touchkey_remove(struct i2c_client * client)202 static int __devexit mcs_touchkey_remove(struct i2c_client *client)
203 {
204 struct mcs_touchkey_data *data = i2c_get_clientdata(client);
205
206 free_irq(client->irq, data);
207 if (data->poweron)
208 data->poweron(false);
209 input_unregister_device(data->input_dev);
210 kfree(data);
211
212 return 0;
213 }
214
mcs_touchkey_shutdown(struct i2c_client * client)215 static void mcs_touchkey_shutdown(struct i2c_client *client)
216 {
217 struct mcs_touchkey_data *data = i2c_get_clientdata(client);
218
219 if (data->poweron)
220 data->poweron(false);
221 }
222
223 #ifdef CONFIG_PM_SLEEP
mcs_touchkey_suspend(struct device * dev)224 static int mcs_touchkey_suspend(struct device *dev)
225 {
226 struct mcs_touchkey_data *data = dev_get_drvdata(dev);
227 struct i2c_client *client = data->client;
228
229 /* Disable the work */
230 disable_irq(client->irq);
231
232 /* Finally turn off the power */
233 if (data->poweron)
234 data->poweron(false);
235
236 return 0;
237 }
238
mcs_touchkey_resume(struct device * dev)239 static int mcs_touchkey_resume(struct device *dev)
240 {
241 struct mcs_touchkey_data *data = dev_get_drvdata(dev);
242 struct i2c_client *client = data->client;
243
244 /* Enable the device first */
245 if (data->poweron)
246 data->poweron(true);
247
248 /* Enable irq again */
249 enable_irq(client->irq);
250
251 return 0;
252 }
253 #endif
254
255 static SIMPLE_DEV_PM_OPS(mcs_touchkey_pm_ops,
256 mcs_touchkey_suspend, mcs_touchkey_resume);
257
258 static const struct i2c_device_id mcs_touchkey_id[] = {
259 { "mcs5000_touchkey", MCS5000_TOUCHKEY },
260 { "mcs5080_touchkey", MCS5080_TOUCHKEY },
261 { }
262 };
263 MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id);
264
265 static struct i2c_driver mcs_touchkey_driver = {
266 .driver = {
267 .name = "mcs_touchkey",
268 .owner = THIS_MODULE,
269 .pm = &mcs_touchkey_pm_ops,
270 },
271 .probe = mcs_touchkey_probe,
272 .remove = __devexit_p(mcs_touchkey_remove),
273 .shutdown = mcs_touchkey_shutdown,
274 .id_table = mcs_touchkey_id,
275 };
276
277 module_i2c_driver(mcs_touchkey_driver);
278
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");
284