This source file includes following definitions.
- tm2_touchkey_led_brightness_set
- tm2_touchkey_power_enable
- tm2_touchkey_power_disable
- tm2_touchkey_irq_handler
- tm2_touchkey_probe
- tm2_touchkey_suspend
- tm2_touchkey_resume
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12 #include <linux/bitops.h>
13 #include <linux/delay.h>
14 #include <linux/device.h>
15 #include <linux/i2c.h>
16 #include <linux/input.h>
17 #include <linux/interrupt.h>
18 #include <linux/irq.h>
19 #include <linux/leds.h>
20 #include <linux/module.h>
21 #include <linux/of.h>
22 #include <linux/of_device.h>
23 #include <linux/pm.h>
24 #include <linux/regulator/consumer.h>
25
26 #define TM2_TOUCHKEY_DEV_NAME "tm2-touchkey"
27
28 #define ARIES_TOUCHKEY_CMD_LED_ON 0x1
29 #define ARIES_TOUCHKEY_CMD_LED_OFF 0x2
30 #define TM2_TOUCHKEY_CMD_LED_ON 0x10
31 #define TM2_TOUCHKEY_CMD_LED_OFF 0x20
32 #define TM2_TOUCHKEY_BIT_PRESS_EV BIT(3)
33 #define TM2_TOUCHKEY_BIT_KEYCODE GENMASK(2, 0)
34 #define TM2_TOUCHKEY_LED_VOLTAGE_MIN 2500000
35 #define TM2_TOUCHKEY_LED_VOLTAGE_MAX 3300000
36
37 struct touchkey_variant {
38 u8 keycode_reg;
39 u8 base_reg;
40 u8 cmd_led_on;
41 u8 cmd_led_off;
42 bool no_reg;
43 bool fixed_regulator;
44 };
45
46 struct tm2_touchkey_data {
47 struct i2c_client *client;
48 struct input_dev *input_dev;
49 struct led_classdev led_dev;
50 struct regulator *vdd;
51 struct regulator_bulk_data regulators[2];
52 const struct touchkey_variant *variant;
53 u32 keycodes[4];
54 int num_keycodes;
55 };
56
57 static const struct touchkey_variant tm2_touchkey_variant = {
58 .keycode_reg = 0x03,
59 .base_reg = 0x00,
60 .cmd_led_on = TM2_TOUCHKEY_CMD_LED_ON,
61 .cmd_led_off = TM2_TOUCHKEY_CMD_LED_OFF,
62 };
63
64 static const struct touchkey_variant midas_touchkey_variant = {
65 .keycode_reg = 0x00,
66 .base_reg = 0x00,
67 .cmd_led_on = TM2_TOUCHKEY_CMD_LED_ON,
68 .cmd_led_off = TM2_TOUCHKEY_CMD_LED_OFF,
69 };
70
71 static struct touchkey_variant aries_touchkey_variant = {
72 .no_reg = true,
73 .fixed_regulator = true,
74 .cmd_led_on = ARIES_TOUCHKEY_CMD_LED_ON,
75 .cmd_led_off = ARIES_TOUCHKEY_CMD_LED_OFF,
76 };
77
78 static const struct touchkey_variant tc360_touchkey_variant = {
79 .keycode_reg = 0x00,
80 .base_reg = 0x00,
81 .fixed_regulator = true,
82 .cmd_led_on = TM2_TOUCHKEY_CMD_LED_ON,
83 .cmd_led_off = TM2_TOUCHKEY_CMD_LED_OFF,
84 };
85
86 static int tm2_touchkey_led_brightness_set(struct led_classdev *led_dev,
87 enum led_brightness brightness)
88 {
89 struct tm2_touchkey_data *touchkey =
90 container_of(led_dev, struct tm2_touchkey_data, led_dev);
91 u32 volt;
92 u8 data;
93
94 if (brightness == LED_OFF) {
95 volt = TM2_TOUCHKEY_LED_VOLTAGE_MIN;
96 data = touchkey->variant->cmd_led_off;
97 } else {
98 volt = TM2_TOUCHKEY_LED_VOLTAGE_MAX;
99 data = touchkey->variant->cmd_led_on;
100 }
101
102 if (!touchkey->variant->fixed_regulator)
103 regulator_set_voltage(touchkey->vdd, volt, volt);
104
105 return touchkey->variant->no_reg ?
106 i2c_smbus_write_byte(touchkey->client, data) :
107 i2c_smbus_write_byte_data(touchkey->client,
108 touchkey->variant->base_reg, data);
109 }
110
111 static int tm2_touchkey_power_enable(struct tm2_touchkey_data *touchkey)
112 {
113 int error;
114
115 error = regulator_bulk_enable(ARRAY_SIZE(touchkey->regulators),
116 touchkey->regulators);
117 if (error)
118 return error;
119
120
121 msleep(150);
122
123 return 0;
124 }
125
126 static void tm2_touchkey_power_disable(void *data)
127 {
128 struct tm2_touchkey_data *touchkey = data;
129
130 regulator_bulk_disable(ARRAY_SIZE(touchkey->regulators),
131 touchkey->regulators);
132 }
133
134 static irqreturn_t tm2_touchkey_irq_handler(int irq, void *devid)
135 {
136 struct tm2_touchkey_data *touchkey = devid;
137 int data;
138 int index;
139 int i;
140
141 if (touchkey->variant->no_reg)
142 data = i2c_smbus_read_byte(touchkey->client);
143 else
144 data = i2c_smbus_read_byte_data(touchkey->client,
145 touchkey->variant->keycode_reg);
146 if (data < 0) {
147 dev_err(&touchkey->client->dev,
148 "failed to read i2c data: %d\n", data);
149 goto out;
150 }
151
152 index = (data & TM2_TOUCHKEY_BIT_KEYCODE) - 1;
153 if (index < 0 || index >= touchkey->num_keycodes) {
154 dev_warn(&touchkey->client->dev,
155 "invalid keycode index %d\n", index);
156 goto out;
157 }
158
159 if (data & TM2_TOUCHKEY_BIT_PRESS_EV) {
160 for (i = 0; i < touchkey->num_keycodes; i++)
161 input_report_key(touchkey->input_dev,
162 touchkey->keycodes[i], 0);
163 } else {
164 input_report_key(touchkey->input_dev,
165 touchkey->keycodes[index], 1);
166 }
167
168 input_sync(touchkey->input_dev);
169
170 out:
171 if (touchkey->variant->fixed_regulator &&
172 data & TM2_TOUCHKEY_BIT_PRESS_EV) {
173
174 if (touchkey->led_dev.brightness == LED_OFF)
175 tm2_touchkey_led_brightness_set(&touchkey->led_dev,
176 LED_OFF);
177 }
178
179 return IRQ_HANDLED;
180 }
181
182 static int tm2_touchkey_probe(struct i2c_client *client,
183 const struct i2c_device_id *id)
184 {
185 struct device_node *np = client->dev.of_node;
186 struct tm2_touchkey_data *touchkey;
187 int error;
188 int i;
189
190 if (!i2c_check_functionality(client->adapter,
191 I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_BYTE_DATA)) {
192 dev_err(&client->dev, "incompatible I2C adapter\n");
193 return -EIO;
194 }
195
196 touchkey = devm_kzalloc(&client->dev, sizeof(*touchkey), GFP_KERNEL);
197 if (!touchkey)
198 return -ENOMEM;
199
200 touchkey->client = client;
201 i2c_set_clientdata(client, touchkey);
202
203 touchkey->variant = of_device_get_match_data(&client->dev);
204
205 touchkey->regulators[0].supply = "vcc";
206 touchkey->regulators[1].supply = "vdd";
207 error = devm_regulator_bulk_get(&client->dev,
208 ARRAY_SIZE(touchkey->regulators),
209 touchkey->regulators);
210 if (error) {
211 dev_err(&client->dev, "failed to get regulators: %d\n", error);
212 return error;
213 }
214
215
216 touchkey->vdd = touchkey->regulators[1].consumer;
217
218 touchkey->num_keycodes = of_property_read_variable_u32_array(np,
219 "linux,keycodes", touchkey->keycodes, 0,
220 ARRAY_SIZE(touchkey->keycodes));
221 if (touchkey->num_keycodes <= 0) {
222
223 touchkey->keycodes[0] = KEY_PHONE;
224 touchkey->keycodes[1] = KEY_BACK;
225 touchkey->num_keycodes = 2;
226 }
227
228 error = tm2_touchkey_power_enable(touchkey);
229 if (error) {
230 dev_err(&client->dev, "failed to power up device: %d\n", error);
231 return error;
232 }
233
234 error = devm_add_action_or_reset(&client->dev,
235 tm2_touchkey_power_disable, touchkey);
236 if (error) {
237 dev_err(&client->dev,
238 "failed to install poweroff handler: %d\n", error);
239 return error;
240 }
241
242
243 touchkey->input_dev = devm_input_allocate_device(&client->dev);
244 if (!touchkey->input_dev) {
245 dev_err(&client->dev, "failed to allocate input device\n");
246 return -ENOMEM;
247 }
248
249 touchkey->input_dev->name = TM2_TOUCHKEY_DEV_NAME;
250 touchkey->input_dev->id.bustype = BUS_I2C;
251
252 for (i = 0; i < touchkey->num_keycodes; i++)
253 input_set_capability(touchkey->input_dev, EV_KEY,
254 touchkey->keycodes[i]);
255
256 error = input_register_device(touchkey->input_dev);
257 if (error) {
258 dev_err(&client->dev,
259 "failed to register input device: %d\n", error);
260 return error;
261 }
262
263 error = devm_request_threaded_irq(&client->dev, client->irq,
264 NULL, tm2_touchkey_irq_handler,
265 IRQF_ONESHOT,
266 TM2_TOUCHKEY_DEV_NAME, touchkey);
267 if (error) {
268 dev_err(&client->dev,
269 "failed to request threaded irq: %d\n", error);
270 return error;
271 }
272
273
274 touchkey->led_dev.name = TM2_TOUCHKEY_DEV_NAME;
275 touchkey->led_dev.brightness = LED_ON;
276 touchkey->led_dev.max_brightness = LED_ON;
277 touchkey->led_dev.brightness_set_blocking =
278 tm2_touchkey_led_brightness_set;
279
280 error = devm_led_classdev_register(&client->dev, &touchkey->led_dev);
281 if (error) {
282 dev_err(&client->dev,
283 "failed to register touchkey led: %d\n", error);
284 return error;
285 }
286
287 if (touchkey->variant->fixed_regulator)
288 tm2_touchkey_led_brightness_set(&touchkey->led_dev, LED_ON);
289
290 return 0;
291 }
292
293 static int __maybe_unused tm2_touchkey_suspend(struct device *dev)
294 {
295 struct i2c_client *client = to_i2c_client(dev);
296 struct tm2_touchkey_data *touchkey = i2c_get_clientdata(client);
297
298 disable_irq(client->irq);
299 tm2_touchkey_power_disable(touchkey);
300
301 return 0;
302 }
303
304 static int __maybe_unused tm2_touchkey_resume(struct device *dev)
305 {
306 struct i2c_client *client = to_i2c_client(dev);
307 struct tm2_touchkey_data *touchkey = i2c_get_clientdata(client);
308 int ret;
309
310 enable_irq(client->irq);
311
312 ret = tm2_touchkey_power_enable(touchkey);
313 if (ret)
314 dev_err(dev, "failed to enable power: %d\n", ret);
315
316 return ret;
317 }
318
319 static SIMPLE_DEV_PM_OPS(tm2_touchkey_pm_ops,
320 tm2_touchkey_suspend, tm2_touchkey_resume);
321
322 static const struct i2c_device_id tm2_touchkey_id_table[] = {
323 { TM2_TOUCHKEY_DEV_NAME, 0 },
324 { },
325 };
326 MODULE_DEVICE_TABLE(i2c, tm2_touchkey_id_table);
327
328 static const struct of_device_id tm2_touchkey_of_match[] = {
329 {
330 .compatible = "cypress,tm2-touchkey",
331 .data = &tm2_touchkey_variant,
332 }, {
333 .compatible = "cypress,midas-touchkey",
334 .data = &midas_touchkey_variant,
335 }, {
336 .compatible = "cypress,aries-touchkey",
337 .data = &aries_touchkey_variant,
338 }, {
339 .compatible = "coreriver,tc360-touchkey",
340 .data = &tc360_touchkey_variant,
341 },
342 { },
343 };
344 MODULE_DEVICE_TABLE(of, tm2_touchkey_of_match);
345
346 static struct i2c_driver tm2_touchkey_driver = {
347 .driver = {
348 .name = TM2_TOUCHKEY_DEV_NAME,
349 .pm = &tm2_touchkey_pm_ops,
350 .of_match_table = of_match_ptr(tm2_touchkey_of_match),
351 },
352 .probe = tm2_touchkey_probe,
353 .id_table = tm2_touchkey_id_table,
354 };
355 module_i2c_driver(tm2_touchkey_driver);
356
357 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
358 MODULE_AUTHOR("Jaechul Lee <jcsing.lee@samsung.com>");
359 MODULE_DESCRIPTION("Samsung touchkey driver");
360 MODULE_LICENSE("GPL v2");