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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
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 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
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(sizeof(struct mcs_touchkey_data) +
117 sizeof(data->keycodes[0]) * (pdata->key_maxval + 1),
118 GFP_KERNEL);
119 input_dev = input_allocate_device();
120 if (!data || !input_dev) {
121 dev_err(&client->dev, "Failed to allocate memory\n");
122 error = -ENOMEM;
123 goto err_free_mem;
124 }
125
126 data->client = client;
127 data->input_dev = input_dev;
128
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;
134 } else {
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;
140 }
141
142 fw_ver = i2c_smbus_read_byte_data(client, fw_reg);
143 if (fw_ver < 0) {
144 error = fw_ver;
145 dev_err(&client->dev, "i2c read error[%d]\n", error);
146 goto err_free_mem;
147 }
148 dev_info(&client->dev, "Firmware version: %d\n", fw_ver);
149
150 input_dev->name = "MELFAS 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;
159
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]);
163
164 data->keycodes[val] = code;
165 __set_bit(code, input_dev->keybit);
166 }
167
168 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
169 input_set_drvdata(input_dev, data);
170
171 if (pdata->cfg_pin)
172 pdata->cfg_pin();
173
174 if (pdata->poweron) {
175 data->poweron = pdata->poweron;
176 data->poweron(true);
177 }
178
179 error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt,
180 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
181 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
194err_free_irq:
195 free_irq(client->irq, data);
196err_free_mem:
197 input_free_device(input_dev);
198 kfree(data);
199 return error;
200}
201
202static int 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
215static 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
224static 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
230 disable_irq(client->irq);
231
232
233 if (data->poweron)
234 data->poweron(false);
235
236 return 0;
237}
238
239static 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
245 if (data->poweron)
246 data->poweron(true);
247
248
249 enable_irq(client->irq);
250
251 return 0;
252}
253#endif
254
255static SIMPLE_DEV_PM_OPS(mcs_touchkey_pm_ops,
256 mcs_touchkey_suspend, mcs_touchkey_resume);
257
258static const struct i2c_device_id mcs_touchkey_id[] = {
259 { "mcs5000_touchkey", MCS5000_TOUCHKEY },
260 { "mcs5080_touchkey", MCS5080_TOUCHKEY },
261 { }
262};
263MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id);
264
265static struct i2c_driver mcs_touchkey_driver = {
266 .driver = {
267 .name = "mcs_touchkey",
268 .pm = &mcs_touchkey_pm_ops,
269 },
270 .probe = mcs_touchkey_probe,
271 .remove = mcs_touchkey_remove,
272 .shutdown = mcs_touchkey_shutdown,
273 .id_table = mcs_touchkey_id,
274};
275
276module_i2c_driver(mcs_touchkey_driver);
277
278
279MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
280MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>");
281MODULE_DESCRIPTION("Touchkey driver for MELFAS MCS5000/5080 controller");
282MODULE_LICENSE("GPL");
283
