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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 | |
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 | |
100 | static int 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 | IRQF_ONESHOT, |
182 | client->dev.driver->name, data); |
183 | if (error) { |
184 | dev_err(&client->dev, "Failed to register interrupt\n"); |
185 | goto err_free_mem; |
186 | } |
187 | |
188 | error = input_register_device(input_dev); |
189 | if (error) |
190 | goto err_free_irq; |
191 | |
192 | i2c_set_clientdata(client, data); |
193 | return 0; |
194 | |
195 | err_free_irq: |
196 | free_irq(client->irq, data); |
197 | err_free_mem: |
198 | input_free_device(input_dev); |
199 | kfree(data); |
200 | return error; |
201 | } |
202 | |
203 | static int mcs_touchkey_remove(struct i2c_client *client) |
204 | { |
205 | struct mcs_touchkey_data *data = i2c_get_clientdata(client); |
206 | |
207 | free_irq(client->irq, data); |
208 | if (data->poweron) |
209 | data->poweron(false); |
210 | input_unregister_device(data->input_dev); |
211 | kfree(data); |
212 | |
213 | return 0; |
214 | } |
215 | |
216 | static void mcs_touchkey_shutdown(struct i2c_client *client) |
217 | { |
218 | struct mcs_touchkey_data *data = i2c_get_clientdata(client); |
219 | |
220 | if (data->poweron) |
221 | data->poweron(false); |
222 | } |
223 | |
224 | #ifdef CONFIG_PM_SLEEP |
225 | static int mcs_touchkey_suspend(struct device *dev) |
226 | { |
227 | struct mcs_touchkey_data *data = dev_get_drvdata(dev); |
228 | struct i2c_client *client = data->client; |
229 | |
230 | /* Disable the work */ |
231 | disable_irq(client->irq); |
232 | |
233 | /* Finally turn off the power */ |
234 | if (data->poweron) |
235 | data->poweron(false); |
236 | |
237 | return 0; |
238 | } |
239 | |
240 | static int mcs_touchkey_resume(struct device *dev) |
241 | { |
242 | struct mcs_touchkey_data *data = dev_get_drvdata(dev); |
243 | struct i2c_client *client = data->client; |
244 | |
245 | /* Enable the device first */ |
246 | if (data->poweron) |
247 | data->poweron(true); |
248 | |
249 | /* Enable irq again */ |
250 | enable_irq(client->irq); |
251 | |
252 | return 0; |
253 | } |
254 | #endif |
255 | |
256 | static SIMPLE_DEV_PM_OPS(mcs_touchkey_pm_ops, |
257 | mcs_touchkey_suspend, mcs_touchkey_resume); |
258 | |
259 | static const struct i2c_device_id mcs_touchkey_id[] = { |
260 | { "mcs5000_touchkey", MCS5000_TOUCHKEY }, |
261 | { "mcs5080_touchkey", MCS5080_TOUCHKEY }, |
262 | { } |
263 | }; |
264 | MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id); |
265 | |
266 | static struct i2c_driver mcs_touchkey_driver = { |
267 | .driver = { |
268 | .name = "mcs_touchkey", |
269 | .owner = THIS_MODULE, |
270 | .pm = &mcs_touchkey_pm_ops, |
271 | }, |
272 | .probe = mcs_touchkey_probe, |
273 | .remove = mcs_touchkey_remove, |
274 | .shutdown = mcs_touchkey_shutdown, |
275 | .id_table = mcs_touchkey_id, |
276 | }; |
277 | |
278 | module_i2c_driver(mcs_touchkey_driver); |
279 | |
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"); |
285 |
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