add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/input/keyboard/qt2160.c
..
..
@@ -1,21 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
1
2
 /*
2
3
  *  qt2160.c - Atmel AT42QT2160 Touch Sense Controller
3
4
  *
4
5
  *  Copyright (C) 2009 Raphael Derosso Pereira <raphaelpereira@gmail.com>
5
- *
6
- *  This program is free software; you can redistribute it and/or modify
7
- *  it under the terms of the GNU General Public License as published by
8
- *  the Free Software Foundation; either version 2 of the License, or
9
- *  (at your option) any later version.
10
- *
11
- *  This program is distributed in the hope that it will be useful,
12
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14
- *  GNU General Public License for more details.
15
- *
16
- *  You should have received a copy of the GNU General Public License
17
- *  along with this program; if not, write to the Free Software
18
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19
6
  */
20
7
 
21
8
 #include <linux/kernel.h>
..
..
@@ -58,10 +45,9 @@
58
45
 struct qt2160_led {
59
46
 	struct qt2160_data *qt2160;
60
47
 	struct led_classdev cdev;
61
-	struct work_struct work;
62
48
 	char name[32];
63
49
 	int id;
64
-	enum led_brightness new_brightness;
50
+	enum led_brightness brightness;
65
51
 };
66
52
 #endif
67
53
 
..
..
@@ -69,12 +55,10 @@
69
55
 	struct i2c_client *client;
70
56
 	struct input_dev *input;
71
57
 	struct delayed_work dwork;
72
-	spinlock_t lock;        /* Protects canceling/rescheduling of dwork */
73
58
 	unsigned short keycodes[ARRAY_SIZE(qt2160_key2code)];
74
59
 	u16 key_matrix;
75
60
 #ifdef CONFIG_LEDS_CLASS
76
61
 	struct qt2160_led leds[QT2160_NUM_LEDS_X];
77
-	struct mutex led_lock;
78
62
 #endif
79
63
 };
80
64
 
..
..
@@ -83,46 +67,39 @@
83
67
 
84
68
 #ifdef CONFIG_LEDS_CLASS
85
69
 
86
-static void qt2160_led_work(struct work_struct *work)
87
-{
88
-	struct qt2160_led *led = container_of(work, struct qt2160_led, work);
89
-	struct qt2160_data *qt2160 = led->qt2160;
90
-	struct i2c_client *client = qt2160->client;
91
-	int value = led->new_brightness;
92
-	u32 drive, pwmen;
93
-
94
-	mutex_lock(&qt2160->led_lock);
95
-
96
-	drive = qt2160_read(client, QT2160_CMD_DRIVE_X);
97
-	pwmen = qt2160_read(client, QT2160_CMD_PWMEN_X);
98
-	if (value != LED_OFF) {
99
-		drive |= (1 << led->id);
100
-		pwmen |= (1 << led->id);
101
-
102
-	} else {
103
-		drive &= ~(1 << led->id);
104
-		pwmen &= ~(1 << led->id);
105
-	}
106
-	qt2160_write(client, QT2160_CMD_DRIVE_X, drive);
107
-	qt2160_write(client, QT2160_CMD_PWMEN_X, pwmen);
108
-
109
-	/*
110
-	 * Changing this register will change the brightness
111
-	 * of every LED in the qt2160. It's a HW limitation.
112
-	 */
113
-	if (value != LED_OFF)
114
-		qt2160_write(client, QT2160_CMD_PWM_DUTY, value);
115
-
116
-	mutex_unlock(&qt2160->led_lock);
117
-}
118
-
119
-static void qt2160_led_set(struct led_classdev *cdev,
120
-			   enum led_brightness value)
70
+static int qt2160_led_set(struct led_classdev *cdev,
71
+			  enum led_brightness value)
121
72
 {
122
73
 	struct qt2160_led *led = container_of(cdev, struct qt2160_led, cdev);
74
+	struct qt2160_data *qt2160 = led->qt2160;
75
+	struct i2c_client *client = qt2160->client;
76
+	u32 drive, pwmen;
123
77
 
124
-	led->new_brightness = value;
125
-	schedule_work(&led->work);
78
+	if (value != led->brightness) {
79
+		drive = qt2160_read(client, QT2160_CMD_DRIVE_X);
80
+		pwmen = qt2160_read(client, QT2160_CMD_PWMEN_X);
81
+		if (value != LED_OFF) {
82
+			drive |= BIT(led->id);
83
+			pwmen |= BIT(led->id);
84
+
85
+		} else {
86
+			drive &= ~BIT(led->id);
87
+			pwmen &= ~BIT(led->id);
88
+		}
89
+		qt2160_write(client, QT2160_CMD_DRIVE_X, drive);
90
+		qt2160_write(client, QT2160_CMD_PWMEN_X, pwmen);
91
+
92
+		/*
93
+		 * Changing this register will change the brightness
94
+		 * of every LED in the qt2160. It's a HW limitation.
95
+		 */
96
+		if (value != LED_OFF)
97
+			qt2160_write(client, QT2160_CMD_PWM_DUTY, value);
98
+
99
+		led->brightness = value;
100
+	}
101
+
102
+	return 0;
126
103
 }
127
104
 
128
105
 #endif /* CONFIG_LEDS_CLASS */
..
..
@@ -221,22 +198,15 @@
221
198
 static irqreturn_t qt2160_irq(int irq, void *_qt2160)
222
199
 {
223
200
 	struct qt2160_data *qt2160 = _qt2160;
224
-	unsigned long flags;
225
-
226
-	spin_lock_irqsave(&qt2160->lock, flags);
227
201
 
228
202
 	mod_delayed_work(system_wq, &qt2160->dwork, 0);
229
-
230
-	spin_unlock_irqrestore(&qt2160->lock, flags);
231
203
 
232
204
 	return IRQ_HANDLED;
233
205
 }
234
206
 
235
207
 static void qt2160_schedule_read(struct qt2160_data *qt2160)
236
208
 {
237
-	spin_lock_irq(&qt2160->lock);
238
209
 	schedule_delayed_work(&qt2160->dwork, QT2160_CYCLE_INTERVAL);
239
-	spin_unlock_irq(&qt2160->lock);
240
210
 }
241
211
 
242
212
 static void qt2160_worker(struct work_struct *work)
..
..
@@ -293,19 +263,15 @@
293
263
 	int ret;
294
264
 	int i;
295
265
 
296
-	mutex_init(&qt2160->led_lock);
297
-
298
266
 	for (i = 0; i < QT2160_NUM_LEDS_X; i++) {
299
267
 		struct qt2160_led *led = &qt2160->leds[i];
300
268
 
301
269
 		snprintf(led->name, sizeof(led->name), "qt2160:x%d", i);
302
270
 		led->cdev.name = led->name;
303
-		led->cdev.brightness_set = qt2160_led_set;
271
+		led->cdev.brightness_set_blocking = qt2160_led_set;
304
272
 		led->cdev.brightness = LED_OFF;
305
273
 		led->id = i;
306
274
 		led->qt2160 = qt2160;
307
-
308
-		INIT_WORK(&led->work, qt2160_led_work);
309
275
 
310
276
 		ret = led_classdev_register(&client->dev, &led->cdev);
311
277
 		if (ret < 0)
..
..
@@ -324,10 +290,8 @@
324
290
 {
325
291
 	int i;
326
292
 
327
-	for (i = 0; i < QT2160_NUM_LEDS_X; i++) {
293
+	for (i = 0; i < QT2160_NUM_LEDS_X; i++)
328
294
 		led_classdev_unregister(&qt2160->leds[i].cdev);
329
-		cancel_work_sync(&qt2160->leds[i].work);
330
-	}
331
295
 }
332
296
 
333
297
 #else
..
..
@@ -406,7 +370,6 @@
406
370
 	qt2160->client = client;
407
371
 	qt2160->input = input;
408
372
 	INIT_DELAYED_WORK(&qt2160->dwork, qt2160_worker);
409
-	spin_lock_init(&qt2160->lock);
410
373
 
411
374
 	input->name = "AT42QT2160 Touch Sense Keyboard";
412
375
 	input->id.bustype = BUS_I2C;