1
2
3
4
5
6
7
8
9
10
11
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
23
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
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 struct i2c_client *client;
49 struct input_dev *input_dev;
50 struct mcs_touchkey_chip chip;
51 unsigned int key_code;
52 unsigned int key_val;
53 unsigned short keycodes[];
54};
55
56static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id)
57{
58 struct mcs_touchkey_data *data = dev_id;
59 struct mcs_touchkey_chip *chip = &data->chip;
60 struct i2c_client *client = data->client;
61 struct input_dev *input = data->input_dev;
62 unsigned int key_val;
63 unsigned int pressed;
64 int val;
65
66 val = i2c_smbus_read_byte_data(client, chip->status_reg);
67 if (val < 0) {
68 dev_err(&client->dev, "i2c read error [%d]\n", val);
69 goto out;
70 }
71
72 pressed = (val & (1 << chip->pressbit)) >> chip->pressbit;
73 if (chip->press_invert)
74 pressed ^= chip->press_invert;
75
76
77 if (pressed) {
78 key_val = val & (0xff >> (8 - chip->pressbit));
79 if (!key_val)
80 goto out;
81 key_val -= chip->baseval;
82 data->key_code = data->keycodes[key_val];
83 data->key_val = key_val;
84 }
85
86 input_event(input, EV_MSC, MSC_SCAN, data->key_val);
87 input_report_key(input, data->key_code, pressed);
88 input_sync(input);
89
90 dev_dbg(&client->dev, "key %d %d %s\n", data->key_val, data->key_code,
91 pressed ? "pressed" : "released");
92
93 out:
94 return IRQ_HANDLED;
95}
96
97static int __devinit mcs_touchkey_probe(struct i2c_client *client,
98 const struct i2c_device_id *id)
99{
100 const struct mcs_platform_data *pdata;
101 struct mcs_touchkey_data *data;
102 struct input_dev *input_dev;
103 unsigned int fw_reg;
104 int fw_ver;
105 int error;
106 int i;
107
108 pdata = client->dev.platform_data;
109 if (!pdata) {
110 dev_err(&client->dev, "no platform data defined\n");
111 return -EINVAL;
112 }
113
114 data = kzalloc(sizeof(struct mcs_touchkey_data) +
115 sizeof(data->keycodes[0]) * (pdata->key_maxval + 1),
116 GFP_KERNEL);
117 input_dev = input_allocate_device();
118 if (!data || !input_dev) {
119 dev_err(&client->dev, "Failed to allocate memory\n");
120 error = -ENOMEM;
121 goto err_free_mem;
122 }
123
124 data->client = client;
125 data->input_dev = input_dev;
126
127 if (id->driver_data == MCS5000_TOUCHKEY) {
128 data->chip.status_reg = MCS5000_TOUCHKEY_STATUS;
129 data->chip.pressbit = MCS5000_TOUCHKEY_STATUS_PRESS;
130 data->chip.baseval = MCS5000_TOUCHKEY_BASE_VAL;
131 fw_reg = MCS5000_TOUCHKEY_FW;
132 } else {
133 data->chip.status_reg = MCS5080_TOUCHKEY_STATUS;
134 data->chip.pressbit = MCS5080_TOUCHKEY_STATUS_PRESS;
135 data->chip.press_invert = 1;
136 data->chip.baseval = MCS5080_TOUCHKEY_BASE_VAL;
137 fw_reg = MCS5080_TOUCHKEY_FW;
138 }
139
140 fw_ver = i2c_smbus_read_byte_data(client, fw_reg);
141 if (fw_ver < 0) {
142 error = fw_ver;
143 dev_err(&client->dev, "i2c read error[%d]\n", error);
144 goto err_free_mem;
145 }
146 dev_info(&client->dev, "Firmware version: %d\n", fw_ver);
147
148 input_dev->name = "MELPAS MCS Touchkey";
149 input_dev->id.bustype = BUS_I2C;
150 input_dev->dev.parent = &client->dev;
151 input_dev->evbit[0] = BIT_MASK(EV_KEY);
152 if (!pdata->no_autorepeat)
153 input_dev->evbit[0] |= BIT_MASK(EV_REP);
154 input_dev->keycode = data->keycodes;
155 input_dev->keycodesize = sizeof(data->keycodes[0]);
156 input_dev->keycodemax = pdata->key_maxval + 1;
157
158 for (i = 0; i < pdata->keymap_size; i++) {
159 unsigned int val = MCS_KEY_VAL(pdata->keymap[i]);
160 unsigned int code = MCS_KEY_CODE(pdata->keymap[i]);
161
162 data->keycodes[val] = code;
163 __set_bit(code, input_dev->keybit);
164 }
165
166 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
167 input_set_drvdata(input_dev, data);
168
169 if (pdata->cfg_pin)
170 pdata->cfg_pin();
171
172 error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt,
173 IRQF_TRIGGER_FALLING, client->dev.driver->name, data);
174 if (error) {
175 dev_err(&client->dev, "Failed to register interrupt\n");
176 goto err_free_mem;
177 }
178
179 error = input_register_device(input_dev);
180 if (error)
181 goto err_free_irq;
182
183 i2c_set_clientdata(client, data);
184 return 0;
185
186err_free_irq:
187 free_irq(client->irq, data);
188err_free_mem:
189 input_free_device(input_dev);
190 kfree(data);
191 return error;
192}
193
194static int __devexit mcs_touchkey_remove(struct i2c_client *client)
195{
196 struct mcs_touchkey_data *data = i2c_get_clientdata(client);
197
198 free_irq(client->irq, data);
199 input_unregister_device(data->input_dev);
200 kfree(data);
201
202 return 0;
203}
204
205static const struct i2c_device_id mcs_touchkey_id[] = {
206 { "mcs5000_touchkey", MCS5000_TOUCHKEY },
207 { "mcs5080_touchkey", MCS5080_TOUCHKEY },
208 { }
209};
210MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id);
211
212static struct i2c_driver mcs_touchkey_driver = {
213 .driver = {
214 .name = "mcs_touchkey",
215 .owner = THIS_MODULE,
216 },
217 .probe = mcs_touchkey_probe,
218 .remove = __devexit_p(mcs_touchkey_remove),
219 .id_table = mcs_touchkey_id,
220};
221
222static int __init mcs_touchkey_init(void)
223{
224 return i2c_add_driver(&mcs_touchkey_driver);
225}
226
227static void __exit mcs_touchkey_exit(void)
228{
229 i2c_del_driver(&mcs_touchkey_driver);
230}
231
232module_init(mcs_touchkey_init);
233module_exit(mcs_touchkey_exit);
234
235
236MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
237MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>");
238MODULE_DESCRIPTION("Touchkey driver for MELFAS MCS5000/5080 controller");
239MODULE_LICENSE("GPL");
240
