modify sin led gpio

hc

2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e

 kernel/drivers/platform/x86/intel_scu_ipcutil.c
..
..
@@ -1,32 +1,31 @@
1
+// SPDX-License-Identifier: GPL-2.0
1
2
 /*
2
- * intel_scu_ipc.c: Driver for the Intel SCU IPC mechanism
3
+ * Driver for the Intel SCU IPC mechanism
3
4
  *
4
5
  * (C) Copyright 2008-2010 Intel Corporation
5
6
  * Author: Sreedhara DS (sreedhara.ds@intel.com)
6
7
  *
7
- * This program is free software; you can redistribute it and/or
8
- * modify it under the terms of the GNU General Public License
9
- * as published by the Free Software Foundation; version 2
10
- * of the License.
11
- *
12
- * This driver provides ioctl interfaces to call intel scu ipc driver api
8
+ * This driver provides IOCTL interfaces to call Intel SCU IPC driver API.
13
9
  */
14
10
 
15
-#include <linux/module.h>
16
-#include <linux/kernel.h>
17
11
 #include <linux/errno.h>
18
-#include <linux/types.h>
19
-#include <linux/fs.h>
20
12
 #include <linux/fcntl.h>
13
+#include <linux/fs.h>
14
+#include <linux/kernel.h>
15
+#include <linux/module.h>
21
16
 #include <linux/sched.h>
22
-#include <linux/uaccess.h>
23
17
 #include <linux/slab.h>
24
-#include <linux/init.h>
18
+#include <linux/types.h>
19
+#include <linux/uaccess.h>
20
+
25
21
 #include <asm/intel_scu_ipc.h>
26
22
 
27
23
 static int major;
28
24
 
29
-/* ioctl commnds */
25
+struct intel_scu_ipc_dev *scu;
26
+static DEFINE_MUTEX(scu_lock);
27
+
28
+/* IOCTL commands */
30
29
 #define	INTE_SCU_IPC_REGISTER_READ	0
31
30
 #define INTE_SCU_IPC_REGISTER_WRITE	1
32
31
 #define INTE_SCU_IPC_REGISTER_UPDATE	2
..
..
@@ -56,12 +55,12 @@
56
55
 
57
56
 	switch (cmd) {
58
57
 	case INTE_SCU_IPC_REGISTER_READ:
59
-		return intel_scu_ipc_readv(data->addr, data->data, count);
58
+		return intel_scu_ipc_dev_readv(scu, data->addr, data->data, count);
60
59
 	case INTE_SCU_IPC_REGISTER_WRITE:
61
-		return intel_scu_ipc_writev(data->addr, data->data, count);
60
+		return intel_scu_ipc_dev_writev(scu, data->addr, data->data, count);
62
61
 	case INTE_SCU_IPC_REGISTER_UPDATE:
63
-		return intel_scu_ipc_update_register(data->addr[0],
64
-						    data->data[0], data->mask);
62
+		return intel_scu_ipc_dev_update(scu, data->addr[0], data->data[0],
63
+						data->mask);
65
64
 	default:
66
65
 		return -ENOTTY;
67
66
 	}
..
..
@@ -95,8 +94,40 @@
95
94
 	return 0;
96
95
 }
97
96
 
97
+static int scu_ipc_open(struct inode *inode, struct file *file)
98
+{
99
+	int ret = 0;
100
+
101
+	/* Only single open at the time */
102
+	mutex_lock(&scu_lock);
103
+	if (scu) {
104
+		ret = -EBUSY;
105
+		goto unlock;
106
+	}
107
+
108
+	scu = intel_scu_ipc_dev_get();
109
+	if (!scu)
110
+		ret = -ENODEV;
111
+
112
+unlock:
113
+	mutex_unlock(&scu_lock);
114
+	return ret;
115
+}
116
+
117
+static int scu_ipc_release(struct inode *inode, struct file *file)
118
+{
119
+	mutex_lock(&scu_lock);
120
+	intel_scu_ipc_dev_put(scu);
121
+	scu = NULL;
122
+	mutex_unlock(&scu_lock);
123
+
124
+	return 0;
125
+}
126
+
98
127
 static const struct file_operations scu_ipc_fops = {
99
128
 	.unlocked_ioctl = scu_ipc_ioctl,
129
+	.open = scu_ipc_open,
130
+	.release = scu_ipc_release,
100
131
 };
101
132
 
102
133
 static int __init ipc_module_init(void)