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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb 
 kernel/drivers/input/keyboard/tm2-touchkey.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * TM2 touchkey device driver
34  *
....@@ -6,10 +7,6 @@
67  *
78  * Author: Beomho Seo <beomho.seo@samsung.com>
89  * Author: Jaechul Lee <jcsing.lee@samsung.com>
9
- *
10
- * This program is free software; you can redistribute it and/or modify
11
- * it under the terms of the GNU General Public License version 2 as
12
- * published by the Free Software Foundation.
1310  */
1411 
1512 #include <linux/bitops.h>
....@@ -22,12 +19,14 @@
2219 #include <linux/leds.h>
2320 #include <linux/module.h>
2421 #include <linux/of.h>
22
+#include <linux/of_device.h>
2523 #include <linux/pm.h>
2624 #include <linux/regulator/consumer.h>
2725 
2826 #define TM2_TOUCHKEY_DEV_NAME		"tm2-touchkey"
29
-#define TM2_TOUCHKEY_KEYCODE_REG	0x03
30
-#define TM2_TOUCHKEY_BASE_REG		0x00
27
+
28
+#define ARIES_TOUCHKEY_CMD_LED_ON	0x1
29
+#define ARIES_TOUCHKEY_CMD_LED_OFF	0x2
3130 #define TM2_TOUCHKEY_CMD_LED_ON		0x10
3231 #define TM2_TOUCHKEY_CMD_LED_OFF	0x20
3332 #define TM2_TOUCHKEY_BIT_PRESS_EV	BIT(3)
....@@ -35,9 +34,13 @@
3534 #define TM2_TOUCHKEY_LED_VOLTAGE_MIN	2500000
3635 #define TM2_TOUCHKEY_LED_VOLTAGE_MAX	3300000
3736 
38
-enum {
39
-	TM2_TOUCHKEY_KEY_MENU = 0x1,
40
-	TM2_TOUCHKEY_KEY_BACK,
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;
4144 };
4245 
4346 struct tm2_touchkey_data {
....@@ -46,9 +49,41 @@
4649 	struct led_classdev led_dev;
4750 	struct regulator *vdd;
4851 	struct regulator_bulk_data regulators[2];
52
+	const struct touchkey_variant *variant;
53
+	u32 keycodes[4];
54
+	int num_keycodes;
4955 };
5056 
51
-static void tm2_touchkey_led_brightness_set(struct led_classdev *led_dev,
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,
5287 					    enum led_brightness brightness)
5388 {
5489 	struct tm2_touchkey_data *touchkey =
....@@ -58,15 +93,19 @@
5893 
5994 	if (brightness == LED_OFF) {
6095 		volt = TM2_TOUCHKEY_LED_VOLTAGE_MIN;
61
-		data = TM2_TOUCHKEY_CMD_LED_OFF;
96
+		data = touchkey->variant->cmd_led_off;
6297 	} else {
6398 		volt = TM2_TOUCHKEY_LED_VOLTAGE_MAX;
64
-		data = TM2_TOUCHKEY_CMD_LED_ON;
99
+		data = touchkey->variant->cmd_led_on;
65100 	}
66101 
67
-	regulator_set_voltage(touchkey->vdd, volt, volt);
68
-	i2c_smbus_write_byte_data(touchkey->client,
69
-				  TM2_TOUCHKEY_BASE_REG, data);
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);
70109 }
71110 
72111 static int tm2_touchkey_power_enable(struct tm2_touchkey_data *touchkey)
....@@ -96,49 +135,57 @@
96135 {
97136 	struct tm2_touchkey_data *touchkey = devid;
98137 	int data;
99
-	int key;
138
+	int index;
139
+	int i;
100140 
101
-	data = i2c_smbus_read_byte_data(touchkey->client,
102
-					TM2_TOUCHKEY_KEYCODE_REG);
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);
103146 	if (data < 0) {
104147 		dev_err(&touchkey->client->dev,
105148 			"failed to read i2c data: %d\n", data);
106149 		goto out;
107150 	}
108151 
109
-	switch (data & TM2_TOUCHKEY_BIT_KEYCODE) {
110
-	case TM2_TOUCHKEY_KEY_MENU:
111
-		key = KEY_PHONE;
112
-		break;
113
-
114
-	case TM2_TOUCHKEY_KEY_BACK:
115
-		key = KEY_BACK;
116
-		break;
117
-
118
-	default:
152
+	index = (data & TM2_TOUCHKEY_BIT_KEYCODE) - 1;
153
+	if (index < 0 || index >= touchkey->num_keycodes) {
119154 		dev_warn(&touchkey->client->dev,
120
-			 "unhandled keycode, data %#02x\n", data);
155
+			 "invalid keycode index %d\n", index);
121156 		goto out;
122157 	}
123158 
124159 	if (data & TM2_TOUCHKEY_BIT_PRESS_EV) {
125
-		input_report_key(touchkey->input_dev, KEY_PHONE, 0);
126
-		input_report_key(touchkey->input_dev, KEY_BACK, 0);
160
+		for (i = 0; i < touchkey->num_keycodes; i++)
161
+			input_report_key(touchkey->input_dev,
162
+					 touchkey->keycodes[i], 0);
127163 	} else {
128
-		input_report_key(touchkey->input_dev, key, 1);
164
+		input_report_key(touchkey->input_dev,
165
+				 touchkey->keycodes[index], 1);
129166 	}
130167 
131168 	input_sync(touchkey->input_dev);
132169 
133170 out:
171
+	if (touchkey->variant->fixed_regulator &&
172
+				data & TM2_TOUCHKEY_BIT_PRESS_EV) {
173
+		/* touch turns backlight on, so make sure we're in sync */
174
+		if (touchkey->led_dev.brightness == LED_OFF)
175
+			tm2_touchkey_led_brightness_set(&touchkey->led_dev,
176
+							LED_OFF);
177
+	}
178
+
134179 	return IRQ_HANDLED;
135180 }
136181 
137182 static int tm2_touchkey_probe(struct i2c_client *client,
138183 			      const struct i2c_device_id *id)
139184 {
185
+	struct device_node *np = client->dev.of_node;
140186 	struct tm2_touchkey_data *touchkey;
141187 	int error;
188
+	int i;
142189 
143190 	if (!i2c_check_functionality(client->adapter,
144191 			I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_BYTE_DATA)) {
....@@ -153,6 +200,8 @@
153200 	touchkey->client = client;
154201 	i2c_set_clientdata(client, touchkey);
155202 
203
+	touchkey->variant = of_device_get_match_data(&client->dev);
204
+
156205 	touchkey->regulators[0].supply = "vcc";
157206 	touchkey->regulators[1].supply = "vdd";
158207 	error = devm_regulator_bulk_get(&client->dev,
....@@ -165,6 +214,16 @@
165214 
166215 	/* Save VDD for easy access */
167216 	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
+		/* default keycodes */
223
+		touchkey->keycodes[0] = KEY_PHONE;
224
+		touchkey->keycodes[1] = KEY_BACK;
225
+		touchkey->num_keycodes = 2;
226
+	}
168227 
169228 	error = tm2_touchkey_power_enable(touchkey);
170229 	if (error) {
....@@ -190,8 +249,9 @@
190249 	touchkey->input_dev->name = TM2_TOUCHKEY_DEV_NAME;
191250 	touchkey->input_dev->id.bustype = BUS_I2C;
192251 
193
-	input_set_capability(touchkey->input_dev, EV_KEY, KEY_PHONE);
194
-	input_set_capability(touchkey->input_dev, EV_KEY, KEY_BACK);
252
+	for (i = 0; i < touchkey->num_keycodes; i++)
253
+		input_set_capability(touchkey->input_dev, EV_KEY,
254
+				     touchkey->keycodes[i]);
195255 
196256 	error = input_register_device(touchkey->input_dev);
197257 	if (error) {
....@@ -212,9 +272,10 @@
212272 
213273 	/* led device */
214274 	touchkey->led_dev.name = TM2_TOUCHKEY_DEV_NAME;
215
-	touchkey->led_dev.brightness = LED_FULL;
275
+	touchkey->led_dev.brightness = LED_ON;
216276 	touchkey->led_dev.max_brightness = LED_ON;
217
-	touchkey->led_dev.brightness_set = tm2_touchkey_led_brightness_set;
277
+	touchkey->led_dev.brightness_set_blocking =
278
+					tm2_touchkey_led_brightness_set;
218279 
219280 	error = devm_led_classdev_register(&client->dev, &touchkey->led_dev);
220281 	if (error) {
....@@ -222,6 +283,9 @@
222283 			"failed to register touchkey led: %d\n", error);
223284 		return error;
224285 	}
286
+
287
+	if (touchkey->variant->fixed_regulator)
288
+		tm2_touchkey_led_brightness_set(&touchkey->led_dev, LED_ON);
225289 
226290 	return 0;
227291 }
....@@ -262,7 +326,19 @@
262326 MODULE_DEVICE_TABLE(i2c, tm2_touchkey_id_table);
263327 
264328 static const struct of_device_id tm2_touchkey_of_match[] = {
265
-	{ .compatible = "cypress,tm2-touchkey", },
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
+	},
266342 	{ },
267343 };
268344 MODULE_DEVICE_TABLE(of, tm2_touchkey_of_match);