summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/libertas/firmware.c
blob: 51b92b5df11956adfedadb5137f8f6b61342b0c4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
/*
 * Firmware loading and handling functions.
 */

#include <linux/sched.h>
#include <linux/firmware.h>
#include <linux/module.h>

#include "dev.h"
#include "decl.h"

static void load_next_firmware_from_table(struct lbs_private *private);

static void lbs_fw_loaded(struct lbs_private *priv, int ret,
	const struct firmware *helper, const struct firmware *mainfw)
{
	unsigned long flags;

	lbs_deb_fw("firmware load complete, code %d\n", ret);

	/* User must free helper/mainfw */
	priv->fw_callback(priv, ret, helper, mainfw);

	spin_lock_irqsave(&priv->driver_lock, flags);
	priv->fw_callback = NULL;
	wake_up(&priv->fw_waitq);
	spin_unlock_irqrestore(&priv->driver_lock, flags);
}

static void do_load_firmware(struct lbs_private *priv, const char *name,
	void (*cb)(const struct firmware *fw, void *context))
{
	int ret;

	lbs_deb_fw("Requesting %s\n", name);
	ret = request_firmware_nowait(THIS_MODULE, true, name,
			priv->fw_device, GFP_KERNEL, priv, cb);
	if (ret) {
		lbs_deb_fw("request_firmware_nowait error %d\n", ret);
		lbs_fw_loaded(priv, ret, NULL, NULL);
	}
}

static void main_firmware_cb(const struct firmware *firmware, void *context)
{
	struct lbs_private *priv = context;

	if (!firmware) {
		/* Failed to find firmware: try next table entry */
		load_next_firmware_from_table(priv);
		return;
	}

	/* Firmware found! */
	lbs_fw_loaded(priv, 0, priv->helper_fw, firmware);
	if (priv->helper_fw) {
		release_firmware (priv->helper_fw);
		priv->helper_fw = NULL;
	}
	release_firmware (firmware);
}

static void helper_firmware_cb(const struct firmware *firmware, void *context)
{
	struct lbs_private *priv = context;

	if (!firmware) {
		/* Failed to find firmware: try next table entry */
		load_next_firmware_from_table(priv);
		return;
	}

	/* Firmware found! */
	if (priv->fw_iter->fwname) {
		priv->helper_fw = firmware;
		do_load_firmware(priv, priv->fw_iter->fwname, main_firmware_cb);
	} else {
		/* No main firmware needed for this helper --> success! */
		lbs_fw_loaded(priv, 0, firmware, NULL);
	}
}

static void load_next_firmware_from_table(struct lbs_private *priv)
{
	const struct lbs_fw_table *iter;

	if (!priv->fw_iter)
		iter = priv->fw_table;
	else
		iter = ++priv->fw_iter;

	if (priv->helper_fw) {
		release_firmware(priv->helper_fw);
		priv->helper_fw = NULL;
	}

next:
	if (!iter->helper) {
		/* End of table hit. */
		lbs_fw_loaded(priv, -ENOENT, NULL, NULL);
		return;
	}

	if (iter->model != priv->fw_model) {
		iter++;
		goto next;
	}

	priv->fw_iter = iter;
	do_load_firmware(priv, iter->helper, helper_firmware_cb);
}

void lbs_wait_for_firmware_load(struct lbs_private *priv)
{
	wait_event(priv->fw_waitq, priv->fw_callback == NULL);
}

/**
 *  lbs_get_firmware_async - Retrieves firmware asynchronously. Can load
 *  either a helper firmware and a main firmware (2-stage), or just the helper.
 *
 *  @priv:      Pointer to lbs_private instance
 *  @dev:     	A pointer to &device structure
 *  @card_model: Bus-specific card model ID used to filter firmware table
 *		elements
 *  @fw_table:	Table of firmware file names and device model numbers
 *		terminated by an entry with a NULL helper name
 *	@callback: User callback to invoke when firmware load succeeds or fails.
 */
int lbs_get_firmware_async(struct lbs_private *priv, struct device *device,
			    u32 card_model, const struct lbs_fw_table *fw_table,
			    lbs_fw_cb callback)
{
	unsigned long flags;

	spin_lock_irqsave(&priv->driver_lock, flags);
	if (priv->fw_callback) {
		lbs_deb_fw("firmware load already in progress\n");
		spin_unlock_irqrestore(&priv->driver_lock, flags);
		return -EBUSY;
	}

	priv->fw_device = device;
	priv->fw_callback = callback;
	priv->fw_table = fw_table;
	priv->fw_iter = NULL;
	priv->fw_model = card_model;
	spin_unlock_irqrestore(&priv->driver_lock, flags);

	lbs_deb_fw("Starting async firmware load\n");
	load_next_firmware_from_table(priv);
	return 0;
}
EXPORT_SYMBOL_GPL(lbs_get_firmware_async);

/**
 *  lbs_get_firmware - Retrieves two-stage firmware
 *
 *  @dev:     	A pointer to &device structure
 *  @card_model: Bus-specific card model ID used to filter firmware table
 *		elements
 *  @fw_table:	Table of firmware file names and device model numbers
 *		terminated by an entry with a NULL helper name
 *  @helper:	On success, the helper firmware; caller must free
 *  @mainfw:	On success, the main firmware; caller must free
 *
 * Deprecated: use lbs_get_firmware_async() instead.
 *
 *  returns:		0 on success, non-zero on failure
 */
int lbs_get_firmware(struct device *dev, u32 card_model,
			const struct lbs_fw_table *fw_table,
			const struct firmware **helper,
			const struct firmware **mainfw)
{
	const struct lbs_fw_table *iter;
	int ret;

	BUG_ON(helper == NULL);
	BUG_ON(mainfw == NULL);

	/* Search for firmware to use from the table. */
	iter = fw_table;
	while (iter && iter->helper) {
		if (iter->model != card_model)
			goto next;

		if (*helper == NULL) {
			ret = request_firmware(helper, iter->helper, dev);
			if (ret)
				goto next;

			/* If the device has one-stage firmware (ie cf8305) and
			 * we've got it then we don't need to bother with the
			 * main firmware.
			 */
			if (iter->fwname == NULL)
				return 0;
		}

		if (*mainfw == NULL) {
			ret = request_firmware(mainfw, iter->fwname, dev);
			if (ret) {
				/* Clear the helper to ensure we don't have
				 * mismatched firmware pairs.
				 */
				release_firmware(*helper);
				*helper = NULL;
			}
		}

		if (*helper && *mainfw)
			return 0;

  next:
		iter++;
	}

	/* Failed */
	release_firmware(*helper);
	*helper = NULL;
	release_firmware(*mainfw);
	*mainfw = NULL;

	return -ENOENT;
}
EXPORT_SYMBOL_GPL(lbs_get_firmware);