1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Touchkey driver for MELFAS MCS5000/5080 controller |
4 | * |
5 | * Copyright (C) 2010 Samsung Electronics Co.Ltd |
6 | * Author: HeungJun Kim <riverful.kim@samsung.com> |
7 | * Author: Joonyoung Shim <jy0922.shim@samsung.com> |
8 | */ |
9 | |
10 | #include <linux/module.h> |
11 | #include <linux/i2c.h> |
12 | #include <linux/interrupt.h> |
13 | #include <linux/input.h> |
14 | #include <linux/irq.h> |
15 | #include <linux/slab.h> |
16 | #include <linux/platform_data/mcs.h> |
17 | #include <linux/pm.h> |
18 | |
19 | /* MCS5000 Touchkey */ |
20 | #define MCS5000_TOUCHKEY_STATUS 0x04 |
21 | #define MCS5000_TOUCHKEY_STATUS_PRESS 7 |
22 | #define MCS5000_TOUCHKEY_FW 0x0a |
23 | #define MCS5000_TOUCHKEY_BASE_VAL 0x61 |
24 | |
25 | /* MCS5080 Touchkey */ |
26 | #define MCS5080_TOUCHKEY_STATUS 0x00 |
27 | #define MCS5080_TOUCHKEY_STATUS_PRESS 3 |
28 | #define MCS5080_TOUCHKEY_FW 0x01 |
29 | #define MCS5080_TOUCHKEY_BASE_VAL 0x1 |
30 | |
31 | enum mcs_touchkey_type { |
32 | MCS5000_TOUCHKEY, |
33 | MCS5080_TOUCHKEY, |
34 | }; |
35 | |
36 | struct mcs_touchkey_chip { |
37 | unsigned int status_reg; |
38 | unsigned int pressbit; |
39 | unsigned int press_invert; |
40 | unsigned int baseval; |
41 | }; |
42 | |
43 | struct mcs_touchkey_data { |
44 | void (*poweron)(bool); |
45 | |
46 | struct i2c_client *client; |
47 | struct input_dev *input_dev; |
48 | struct mcs_touchkey_chip chip; |
49 | unsigned int key_code; |
50 | unsigned int key_val; |
51 | unsigned short keycodes[]; |
52 | }; |
53 | |
54 | static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id) |
55 | { |
56 | struct mcs_touchkey_data *data = dev_id; |
57 | struct mcs_touchkey_chip *chip = &data->chip; |
58 | struct i2c_client *client = data->client; |
59 | struct input_dev *input = data->input_dev; |
60 | unsigned int key_val; |
61 | unsigned int pressed; |
62 | int val; |
63 | |
64 | val = i2c_smbus_read_byte_data(client, command: chip->status_reg); |
65 | if (val < 0) { |
66 | dev_err(&client->dev, "i2c read error [%d]\n" , val); |
67 | goto out; |
68 | } |
69 | |
70 | pressed = (val & (1 << chip->pressbit)) >> chip->pressbit; |
71 | if (chip->press_invert) |
72 | pressed ^= chip->press_invert; |
73 | |
74 | /* key_val is 0 when released, so we should use key_val of press. */ |
75 | if (pressed) { |
76 | key_val = val & (0xff >> (8 - chip->pressbit)); |
77 | if (!key_val) |
78 | goto out; |
79 | key_val -= chip->baseval; |
80 | data->key_code = data->keycodes[key_val]; |
81 | data->key_val = key_val; |
82 | } |
83 | |
84 | input_event(dev: input, EV_MSC, MSC_SCAN, value: data->key_val); |
85 | input_report_key(dev: input, code: data->key_code, value: pressed); |
86 | input_sync(dev: input); |
87 | |
88 | dev_dbg(&client->dev, "key %d %d %s\n" , data->key_val, data->key_code, |
89 | pressed ? "pressed" : "released" ); |
90 | |
91 | out: |
92 | return IRQ_HANDLED; |
93 | } |
94 | |
95 | static void mcs_touchkey_poweroff(void *data) |
96 | { |
97 | struct mcs_touchkey_data *touchkey = data; |
98 | |
99 | touchkey->poweron(false); |
100 | } |
101 | |
102 | static int mcs_touchkey_probe(struct i2c_client *client) |
103 | { |
104 | const struct i2c_device_id *id = i2c_client_get_device_id(client); |
105 | const struct mcs_platform_data *pdata; |
106 | struct mcs_touchkey_data *data; |
107 | struct input_dev *input_dev; |
108 | unsigned int fw_reg; |
109 | int fw_ver; |
110 | int error; |
111 | int i; |
112 | |
113 | pdata = dev_get_platdata(dev: &client->dev); |
114 | if (!pdata) { |
115 | dev_err(&client->dev, "no platform data defined\n" ); |
116 | return -EINVAL; |
117 | } |
118 | |
119 | data = devm_kzalloc(dev: &client->dev, |
120 | struct_size(data, keycodes, pdata->key_maxval + 1), |
121 | GFP_KERNEL); |
122 | if (!data) |
123 | return -ENOMEM; |
124 | |
125 | input_dev = devm_input_allocate_device(&client->dev); |
126 | if (!input_dev) { |
127 | dev_err(&client->dev, "Failed to allocate input device\n" ); |
128 | return -ENOMEM; |
129 | } |
130 | |
131 | data->client = client; |
132 | data->input_dev = input_dev; |
133 | |
134 | if (id->driver_data == MCS5000_TOUCHKEY) { |
135 | data->chip.status_reg = MCS5000_TOUCHKEY_STATUS; |
136 | data->chip.pressbit = MCS5000_TOUCHKEY_STATUS_PRESS; |
137 | data->chip.baseval = MCS5000_TOUCHKEY_BASE_VAL; |
138 | fw_reg = MCS5000_TOUCHKEY_FW; |
139 | } else { |
140 | data->chip.status_reg = MCS5080_TOUCHKEY_STATUS; |
141 | data->chip.pressbit = MCS5080_TOUCHKEY_STATUS_PRESS; |
142 | data->chip.press_invert = 1; |
143 | data->chip.baseval = MCS5080_TOUCHKEY_BASE_VAL; |
144 | fw_reg = MCS5080_TOUCHKEY_FW; |
145 | } |
146 | |
147 | fw_ver = i2c_smbus_read_byte_data(client, command: fw_reg); |
148 | if (fw_ver < 0) { |
149 | dev_err(&client->dev, "i2c read error[%d]\n" , fw_ver); |
150 | return fw_ver; |
151 | } |
152 | dev_info(&client->dev, "Firmware version: %d\n" , fw_ver); |
153 | |
154 | input_dev->name = "MELFAS MCS Touchkey" ; |
155 | input_dev->id.bustype = BUS_I2C; |
156 | input_dev->evbit[0] = BIT_MASK(EV_KEY); |
157 | if (!pdata->no_autorepeat) |
158 | input_dev->evbit[0] |= BIT_MASK(EV_REP); |
159 | input_dev->keycode = data->keycodes; |
160 | input_dev->keycodesize = sizeof(data->keycodes[0]); |
161 | input_dev->keycodemax = pdata->key_maxval + 1; |
162 | |
163 | for (i = 0; i < pdata->keymap_size; i++) { |
164 | unsigned int val = MCS_KEY_VAL(pdata->keymap[i]); |
165 | unsigned int code = MCS_KEY_CODE(pdata->keymap[i]); |
166 | |
167 | data->keycodes[val] = code; |
168 | __set_bit(code, input_dev->keybit); |
169 | } |
170 | |
171 | input_set_capability(dev: input_dev, EV_MSC, MSC_SCAN); |
172 | input_set_drvdata(dev: input_dev, data); |
173 | |
174 | if (pdata->cfg_pin) |
175 | pdata->cfg_pin(); |
176 | |
177 | if (pdata->poweron) { |
178 | data->poweron = pdata->poweron; |
179 | data->poweron(true); |
180 | |
181 | error = devm_add_action_or_reset(&client->dev, |
182 | mcs_touchkey_poweroff, data); |
183 | if (error) |
184 | return error; |
185 | } |
186 | |
187 | error = devm_request_threaded_irq(dev: &client->dev, irq: client->irq, |
188 | NULL, thread_fn: mcs_touchkey_interrupt, |
189 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
190 | devname: client->dev.driver->name, dev_id: data); |
191 | if (error) { |
192 | dev_err(&client->dev, "Failed to register interrupt\n" ); |
193 | return error; |
194 | } |
195 | |
196 | error = input_register_device(input_dev); |
197 | if (error) |
198 | return error; |
199 | |
200 | i2c_set_clientdata(client, data); |
201 | return 0; |
202 | } |
203 | |
204 | static void mcs_touchkey_shutdown(struct i2c_client *client) |
205 | { |
206 | struct mcs_touchkey_data *data = i2c_get_clientdata(client); |
207 | |
208 | if (data->poweron) |
209 | data->poweron(false); |
210 | } |
211 | |
212 | static int mcs_touchkey_suspend(struct device *dev) |
213 | { |
214 | struct mcs_touchkey_data *data = dev_get_drvdata(dev); |
215 | struct i2c_client *client = data->client; |
216 | |
217 | /* Disable the work */ |
218 | disable_irq(irq: client->irq); |
219 | |
220 | /* Finally turn off the power */ |
221 | if (data->poweron) |
222 | data->poweron(false); |
223 | |
224 | return 0; |
225 | } |
226 | |
227 | static int mcs_touchkey_resume(struct device *dev) |
228 | { |
229 | struct mcs_touchkey_data *data = dev_get_drvdata(dev); |
230 | struct i2c_client *client = data->client; |
231 | |
232 | /* Enable the device first */ |
233 | if (data->poweron) |
234 | data->poweron(true); |
235 | |
236 | /* Enable irq again */ |
237 | enable_irq(irq: client->irq); |
238 | |
239 | return 0; |
240 | } |
241 | |
242 | static DEFINE_SIMPLE_DEV_PM_OPS(mcs_touchkey_pm_ops, |
243 | mcs_touchkey_suspend, mcs_touchkey_resume); |
244 | |
245 | static const struct i2c_device_id mcs_touchkey_id[] = { |
246 | { "mcs5000_touchkey" , MCS5000_TOUCHKEY }, |
247 | { "mcs5080_touchkey" , MCS5080_TOUCHKEY }, |
248 | { } |
249 | }; |
250 | MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id); |
251 | |
252 | static struct i2c_driver mcs_touchkey_driver = { |
253 | .driver = { |
254 | .name = "mcs_touchkey" , |
255 | .pm = pm_sleep_ptr(&mcs_touchkey_pm_ops), |
256 | }, |
257 | .probe = mcs_touchkey_probe, |
258 | .shutdown = mcs_touchkey_shutdown, |
259 | .id_table = mcs_touchkey_id, |
260 | }; |
261 | |
262 | module_i2c_driver(mcs_touchkey_driver); |
263 | |
264 | /* Module information */ |
265 | MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>" ); |
266 | MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>" ); |
267 | MODULE_DESCRIPTION("Touchkey driver for MELFAS MCS5000/5080 controller" ); |
268 | MODULE_LICENSE("GPL" ); |
269 | |