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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
37struct 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
46struct 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[3];
52 const struct touchkey_variant *variant;
53 u32 keycodes[4];
54 int num_keycodes;
55};
56
57static 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
64static 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
71static 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
78static 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
86static 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
111static 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
126static 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
134static 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
170out:
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
182static 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 touchkey->regulators[2].supply = "vddio";
208 error = devm_regulator_bulk_get(&client->dev,
209 ARRAY_SIZE(touchkey->regulators),
210 touchkey->regulators);
211 if (error) {
212 dev_err(&client->dev, "failed to get regulators: %d\n", error);
213 return error;
214 }
215
216
217 touchkey->vdd = touchkey->regulators[1].consumer;
218
219 touchkey->num_keycodes = of_property_read_variable_u32_array(np,
220 "linux,keycodes", touchkey->keycodes, 0,
221 ARRAY_SIZE(touchkey->keycodes));
222 if (touchkey->num_keycodes <= 0) {
223
224 touchkey->keycodes[0] = KEY_PHONE;
225 touchkey->keycodes[1] = KEY_BACK;
226 touchkey->num_keycodes = 2;
227 }
228
229 error = tm2_touchkey_power_enable(touchkey);
230 if (error) {
231 dev_err(&client->dev, "failed to power up device: %d\n", error);
232 return error;
233 }
234
235 error = devm_add_action_or_reset(&client->dev,
236 tm2_touchkey_power_disable, touchkey);
237 if (error) {
238 dev_err(&client->dev,
239 "failed to install poweroff handler: %d\n", error);
240 return error;
241 }
242
243
244 touchkey->input_dev = devm_input_allocate_device(&client->dev);
245 if (!touchkey->input_dev) {
246 dev_err(&client->dev, "failed to allocate input device\n");
247 return -ENOMEM;
248 }
249
250 touchkey->input_dev->name = TM2_TOUCHKEY_DEV_NAME;
251 touchkey->input_dev->id.bustype = BUS_I2C;
252
253 for (i = 0; i < touchkey->num_keycodes; i++)
254 input_set_capability(touchkey->input_dev, EV_KEY,
255 touchkey->keycodes[i]);
256
257 error = input_register_device(touchkey->input_dev);
258 if (error) {
259 dev_err(&client->dev,
260 "failed to register input device: %d\n", error);
261 return error;
262 }
263
264 error = devm_request_threaded_irq(&client->dev, client->irq,
265 NULL, tm2_touchkey_irq_handler,
266 IRQF_ONESHOT,
267 TM2_TOUCHKEY_DEV_NAME, touchkey);
268 if (error) {
269 dev_err(&client->dev,
270 "failed to request threaded irq: %d\n", error);
271 return error;
272 }
273
274
275 touchkey->led_dev.name = TM2_TOUCHKEY_DEV_NAME;
276 touchkey->led_dev.brightness = LED_ON;
277 touchkey->led_dev.max_brightness = LED_ON;
278 touchkey->led_dev.brightness_set_blocking =
279 tm2_touchkey_led_brightness_set;
280
281 error = devm_led_classdev_register(&client->dev, &touchkey->led_dev);
282 if (error) {
283 dev_err(&client->dev,
284 "failed to register touchkey led: %d\n", error);
285 return error;
286 }
287
288 if (touchkey->variant->fixed_regulator)
289 tm2_touchkey_led_brightness_set(&touchkey->led_dev, LED_ON);
290
291 return 0;
292}
293
294static int __maybe_unused tm2_touchkey_suspend(struct device *dev)
295{
296 struct i2c_client *client = to_i2c_client(dev);
297 struct tm2_touchkey_data *touchkey = i2c_get_clientdata(client);
298
299 disable_irq(client->irq);
300 tm2_touchkey_power_disable(touchkey);
301
302 return 0;
303}
304
305static int __maybe_unused tm2_touchkey_resume(struct device *dev)
306{
307 struct i2c_client *client = to_i2c_client(dev);
308 struct tm2_touchkey_data *touchkey = i2c_get_clientdata(client);
309 int ret;
310
311 enable_irq(client->irq);
312
313 ret = tm2_touchkey_power_enable(touchkey);
314 if (ret)
315 dev_err(dev, "failed to enable power: %d\n", ret);
316
317 return ret;
318}
319
320static SIMPLE_DEV_PM_OPS(tm2_touchkey_pm_ops,
321 tm2_touchkey_suspend, tm2_touchkey_resume);
322
323static const struct i2c_device_id tm2_touchkey_id_table[] = {
324 { TM2_TOUCHKEY_DEV_NAME, 0 },
325 { },
326};
327MODULE_DEVICE_TABLE(i2c, tm2_touchkey_id_table);
328
329static const struct of_device_id tm2_touchkey_of_match[] = {
330 {
331 .compatible = "cypress,tm2-touchkey",
332 .data = &tm2_touchkey_variant,
333 }, {
334 .compatible = "cypress,midas-touchkey",
335 .data = &midas_touchkey_variant,
336 }, {
337 .compatible = "cypress,aries-touchkey",
338 .data = &aries_touchkey_variant,
339 }, {
340 .compatible = "coreriver,tc360-touchkey",
341 .data = &tc360_touchkey_variant,
342 },
343 { },
344};
345MODULE_DEVICE_TABLE(of, tm2_touchkey_of_match);
346
347static struct i2c_driver tm2_touchkey_driver = {
348 .driver = {
349 .name = TM2_TOUCHKEY_DEV_NAME,
350 .pm = &tm2_touchkey_pm_ops,
351 .of_match_table = of_match_ptr(tm2_touchkey_of_match),
352 },
353 .probe = tm2_touchkey_probe,
354 .id_table = tm2_touchkey_id_table,
355};
356module_i2c_driver(tm2_touchkey_driver);
357
358MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
359MODULE_AUTHOR("Jaechul Lee <jcsing.lee@samsung.com>");
360MODULE_DESCRIPTION("Samsung touchkey driver");
361MODULE_LICENSE("GPL v2");
362
