add wifi6 8852be driver

hc

2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da

 kernel/drivers/input/touchscreen/eeti_ts.c
..
..
@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
1
2
 /*
2
3
  * Touch Screen driver for EETI's I2C connected touch screen panels
3
4
  *   Copyright (c) 2009,2018 Daniel Mack <daniel@zonque.org>
..
..
@@ -8,20 +9,6 @@
8
9
  * Based on migor_ts.c
9
10
  *   Copyright (c) 2008 Magnus Damm
10
11
  *   Copyright (c) 2007 Ujjwal Pande <ujjwal@kenati.com>
11
- *
12
- * This file is free software; you can redistribute it and/or
13
- * modify it under the terms of the GNU  General Public
14
- * License as published by the Free Software Foundation; either
15
- * version 2 of the License, or (at your option) any later version.
16
- *
17
- * This file is distributed in the hope that it will be useful,
18
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
19
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
20
- *  General Public License for more details.
21
- *
22
- * You should have received a copy of the GNU General Public
23
- * License along with this library; if not, write to the Free Software
24
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
25
12
  */
26
13
 
27
14
 #include <linux/module.h>
..
..
@@ -41,6 +28,7 @@
41
28
 	struct input_dev *input;
42
29
 	struct gpio_desc *attn_gpio;
43
30
 	struct touchscreen_properties props;
31
+	struct mutex mutex;
44
32
 	bool running;
45
33
 };
46
34
 
..
..
@@ -75,42 +63,80 @@
75
63
 	input_sync(eeti->input);
76
64
 }
77
65
 
66
+static int eeti_ts_read(struct eeti_ts *eeti)
67
+{
68
+	int len, error;
69
+	char buf[6];
70
+
71
+	len = i2c_master_recv(eeti->client, buf, sizeof(buf));
72
+	if (len != sizeof(buf)) {
73
+		error = len < 0 ? len : -EIO;
74
+		dev_err(&eeti->client->dev,
75
+			"failed to read touchscreen data: %d\n",
76
+			error);
77
+		return error;
78
+	}
79
+
80
+	/* Motion packet */
81
+	if (buf[0] & 0x80)
82
+		eeti_ts_report_event(eeti, buf);
83
+
84
+	return 0;
85
+}
86
+
78
87
 static irqreturn_t eeti_ts_isr(int irq, void *dev_id)
79
88
 {
80
89
 	struct eeti_ts *eeti = dev_id;
81
-	int len;
82
90
 	int error;
83
-	char buf[6];
91
+
92
+	mutex_lock(&eeti->mutex);
84
93
 
85
94
 	do {
86
-		len = i2c_master_recv(eeti->client, buf, sizeof(buf));
87
-		if (len != sizeof(buf)) {
88
-			error = len < 0 ? len : -EIO;
89
-			dev_err(&eeti->client->dev,
90
-				"failed to read touchscreen data: %d\n",
91
-				error);
95
+		/*
96
+		 * If we have attention GPIO, trust it. Otherwise we'll read
97
+		 * once and exit. We assume that in this case we are using
98
+		 * level triggered interrupt and it will get raised again
99
+		 * if/when there is more data.
100
+		 */
101
+		if (eeti->attn_gpio &&
102
+		    !gpiod_get_value_cansleep(eeti->attn_gpio)) {
92
103
 			break;
93
104
 		}
94
105
 
95
-		if (buf[0] & 0x80) {
96
-			/* Motion packet */
97
-			eeti_ts_report_event(eeti, buf);
98
-		}
99
-	} while (eeti->running &&
100
-		 eeti->attn_gpio && gpiod_get_value_cansleep(eeti->attn_gpio));
106
+		error = eeti_ts_read(eeti);
107
+		if (error)
108
+			break;
101
109
 
110
+	} while (eeti->running && eeti->attn_gpio);
111
+
112
+	mutex_unlock(&eeti->mutex);
102
113
 	return IRQ_HANDLED;
103
114
 }
104
115
 
105
116
 static void eeti_ts_start(struct eeti_ts *eeti)
106
117
 {
118
+	mutex_lock(&eeti->mutex);
119
+
107
120
 	eeti->running = true;
108
-	wmb();
109
121
 	enable_irq(eeti->client->irq);
122
+
123
+	/*
124
+	 * Kick the controller in case we are using edge interrupt and
125
+	 * we missed our edge while interrupt was disabled. We expect
126
+	 * the attention GPIO to be wired in this case.
127
+	 */
128
+	if (eeti->attn_gpio && gpiod_get_value_cansleep(eeti->attn_gpio))
129
+		eeti_ts_read(eeti);
130
+
131
+	mutex_unlock(&eeti->mutex);
110
132
 }
111
133
 
112
134
 static void eeti_ts_stop(struct eeti_ts *eeti)
113
135
 {
136
+	/*
137
+	 * Not locking here, just setting a flag and expect that the
138
+	 * interrupt thread will notice the flag eventually.
139
+	 */
114
140
 	eeti->running = false;
115
141
 	wmb();
116
142
 	disable_irq(eeti->client->irq);
..
..
@@ -153,6 +179,8 @@
153
179
 		return -ENOMEM;
154
180
 	}
155
181
 
182
+	mutex_init(&eeti->mutex);
183
+
156
184
 	input = devm_input_allocate_device(dev);
157
185
 	if (!input) {
158
186
 		dev_err(dev, "Failed to allocate input device.\n");