1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * This file is part of wlcore
4  *
5  * Copyright (C) 2013 Texas Instruments Inc.
6  */
7 
8 #include <linux/pm_runtime.h>
9 
10 #include "acx.h"
11 #include "wlcore.h"
12 #include "debug.h"
13 #include "sysfs.h"
14 
15 static ssize_t bt_coex_state_show(struct device *dev,
16 				  struct device_attribute *attr,
17 				  char *buf)
18 {
19 	struct wl1271 *wl = dev_get_drvdata(dev);
20 	ssize_t len;
21 
22 	len = PAGE_SIZE;
23 
24 	mutex_lock(&wl->mutex);
25 	len = snprintf(buf, len, "%d\n\n0 - off\n1 - on\n",
26 		       wl->sg_enabled);
27 	mutex_unlock(&wl->mutex);
28 
29 	return len;
30 
31 }
32 
33 static ssize_t bt_coex_state_store(struct device *dev,
34 				   struct device_attribute *attr,
35 				   const char *buf, size_t count)
36 {
37 	struct wl1271 *wl = dev_get_drvdata(dev);
38 	unsigned long res;
39 	int ret;
40 
41 	ret = kstrtoul(buf, 10, &res);
42 	if (ret < 0) {
43 		wl1271_warning("incorrect value written to bt_coex_mode");
44 		return count;
45 	}
46 
47 	mutex_lock(&wl->mutex);
48 
49 	res = !!res;
50 
51 	if (res == wl->sg_enabled)
52 		goto out;
53 
54 	wl->sg_enabled = res;
55 
56 	if (unlikely(wl->state != WLCORE_STATE_ON))
57 		goto out;
58 
59 	ret = pm_runtime_resume_and_get(wl->dev);
60 	if (ret < 0)
61 		goto out;
62 
63 	wl1271_acx_sg_enable(wl, wl->sg_enabled);
64 	pm_runtime_mark_last_busy(wl->dev);
65 	pm_runtime_put_autosuspend(wl->dev);
66 
67  out:
68 	mutex_unlock(&wl->mutex);
69 	return count;
70 }
71 
72 static DEVICE_ATTR_RW(bt_coex_state);
73 
74 static ssize_t hw_pg_ver_show(struct device *dev,
75 			      struct device_attribute *attr,
76 			      char *buf)
77 {
78 	struct wl1271 *wl = dev_get_drvdata(dev);
79 	ssize_t len;
80 
81 	len = PAGE_SIZE;
82 
83 	mutex_lock(&wl->mutex);
84 	if (wl->hw_pg_ver >= 0)
85 		len = snprintf(buf, len, "%d\n", wl->hw_pg_ver);
86 	else
87 		len = snprintf(buf, len, "n/a\n");
88 	mutex_unlock(&wl->mutex);
89 
90 	return len;
91 }
92 
93 static DEVICE_ATTR_RO(hw_pg_ver);
94 
95 static ssize_t wl1271_sysfs_read_fwlog(struct file *filp, struct kobject *kobj,
96 				       struct bin_attribute *bin_attr,
97 				       char *buffer, loff_t pos, size_t count)
98 {
99 	struct device *dev = kobj_to_dev(kobj);
100 	struct wl1271 *wl = dev_get_drvdata(dev);
101 	ssize_t len;
102 	int ret;
103 
104 	ret = mutex_lock_interruptible(&wl->mutex);
105 	if (ret < 0)
106 		return -ERESTARTSYS;
107 
108 	/* Check if the fwlog is still valid */
109 	if (wl->fwlog_size < 0) {
110 		mutex_unlock(&wl->mutex);
111 		return 0;
112 	}
113 
114 	/* Seeking is not supported - old logs are not kept. Disregard pos. */
115 	len = min_t(size_t, count, wl->fwlog_size);
116 	wl->fwlog_size -= len;
117 	memcpy(buffer, wl->fwlog, len);
118 
119 	/* Make room for new messages */
120 	memmove(wl->fwlog, wl->fwlog + len, wl->fwlog_size);
121 
122 	mutex_unlock(&wl->mutex);
123 
124 	return len;
125 }
126 
127 static const struct bin_attribute fwlog_attr = {
128 	.attr = { .name = "fwlog", .mode = 0400 },
129 	.read = wl1271_sysfs_read_fwlog,
130 };
131 
132 int wlcore_sysfs_init(struct wl1271 *wl)
133 {
134 	int ret;
135 
136 	/* Create sysfs file to control bt coex state */
137 	ret = device_create_file(wl->dev, &dev_attr_bt_coex_state);
138 	if (ret < 0) {
139 		wl1271_error("failed to create sysfs file bt_coex_state");
140 		goto out;
141 	}
142 
143 	/* Create sysfs file to get HW PG version */
144 	ret = device_create_file(wl->dev, &dev_attr_hw_pg_ver);
145 	if (ret < 0) {
146 		wl1271_error("failed to create sysfs file hw_pg_ver");
147 		goto out_bt_coex_state;
148 	}
149 
150 	/* Create sysfs file for the FW log */
151 	ret = device_create_bin_file(wl->dev, &fwlog_attr);
152 	if (ret < 0) {
153 		wl1271_error("failed to create sysfs file fwlog");
154 		goto out_hw_pg_ver;
155 	}
156 
157 	goto out;
158 
159 out_hw_pg_ver:
160 	device_remove_file(wl->dev, &dev_attr_hw_pg_ver);
161 
162 out_bt_coex_state:
163 	device_remove_file(wl->dev, &dev_attr_bt_coex_state);
164 
165 out:
166 	return ret;
167 }
168 
169 void wlcore_sysfs_free(struct wl1271 *wl)
170 {
171 	device_remove_bin_file(wl->dev, &fwlog_attr);
172 
173 	device_remove_file(wl->dev, &dev_attr_hw_pg_ver);
174 
175 	device_remove_file(wl->dev, &dev_attr_bt_coex_state);
176 }
177