aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/rsi/rsi_91x_main.c
blob: 8810862ae82629eaf1a0bbb1fd5412a60ef1c32d (plain) (blame)
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
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
/**
 * Copyright (c) 2014 Redpine Signals Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/firmware.h>
#include "rsi_mgmt.h"
#include "rsi_common.h"

u32 rsi_zone_enabled = /* INFO_ZONE |
			INIT_ZONE |
			MGMT_TX_ZONE |
			MGMT_RX_ZONE |
			DATA_TX_ZONE |
			DATA_RX_ZONE |
			FSM_ZONE |
			ISR_ZONE | */
			ERR_ZONE |
			0;
EXPORT_SYMBOL_GPL(rsi_zone_enabled);

/**
 * rsi_dbg() - This function outputs informational messages.
 * @zone: Zone of interest for output message.
 * @fmt: printf-style format for output message.
 *
 * Return: none
 */
void rsi_dbg(u32 zone, const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;

	va_start(args, fmt);

	vaf.fmt = fmt;
	vaf.va = &args;

	if (zone & rsi_zone_enabled)
		pr_info("%pV", &vaf);
	va_end(args);
}
EXPORT_SYMBOL_GPL(rsi_dbg);

/**
 * rsi_prepare_skb() - This function prepares the skb.
 * @common: Pointer to the driver private structure.
 * @buffer: Pointer to the packet data.
 * @pkt_len: Length of the packet.
 * @extended_desc: Extended descriptor.
 *
 * Return: Successfully skb.
 */
static struct sk_buff *rsi_prepare_skb(struct rsi_common *common,
				       u8 *buffer,
				       u32 pkt_len,
				       u8 extended_desc)
{
	struct ieee80211_tx_info *info;
	struct skb_info *rx_params;
	struct sk_buff *skb = NULL;
	u8 payload_offset;

	if (WARN(!pkt_len, "%s: Dummy pkt received", __func__))
		return NULL;

	if (pkt_len > (RSI_RCV_BUFFER_LEN * 4)) {
		rsi_dbg(ERR_ZONE, "%s: Pkt size > max rx buf size %d\n",
			__func__, pkt_len);
		pkt_len = RSI_RCV_BUFFER_LEN * 4;
	}

	pkt_len -= extended_desc;
	skb = dev_alloc_skb(pkt_len + FRAME_DESC_SZ);
	if (skb == NULL)
		return NULL;

	payload_offset = (extended_desc + FRAME_DESC_SZ);
	skb_put(skb, pkt_len);
	memcpy((skb->data), (buffer + payload_offset), skb->len);

	info = IEEE80211_SKB_CB(skb);
	rx_params = (struct skb_info *)info->driver_data;
	rx_params->rssi = rsi_get_rssi(buffer);
	rx_params->channel = rsi_get_connected_channel(common->priv);

	return skb;
}

/**
 * rsi_read_pkt() - This function reads frames from the card.
 * @common: Pointer to the driver private structure.
 * @rcv_pkt_len: Received pkt length. In case of USB it is 0.
 *
 * Return: 0 on success, -1 on failure.
 */
int rsi_read_pkt(struct rsi_common *common, s32 rcv_pkt_len)
{
	u8 *frame_desc = NULL, extended_desc = 0;
	u32 index, length = 0, queueno = 0;
	u16 actual_length = 0, offset;
	struct sk_buff *skb = NULL;

	index = 0;
	do {
		frame_desc = &common->rx_data_pkt[index];
		actual_length = *(u16 *)&frame_desc[0];
		offset = *(u16 *)&frame_desc[2];

		queueno = rsi_get_queueno(frame_desc, offset);
		length = rsi_get_length(frame_desc, offset);
		extended_desc = rsi_get_extended_desc(frame_desc, offset);

		switch (queueno) {
		case RSI_WIFI_DATA_Q:
			skb = rsi_prepare_skb(common,
					      (frame_desc + offset),
					      length,
					      extended_desc);
			if (skb == NULL)
				goto fail;

			rsi_indicate_pkt_to_os(common, skb);
			break;

		case RSI_WIFI_MGMT_Q:
			rsi_mgmt_pkt_recv(common, (frame_desc + offset));
			break;

		default:
			rsi_dbg(ERR_ZONE, "%s: pkt from invalid queue: %d\n",
				__func__,   queueno);
			goto fail;
		}

		index  += actual_length;
		rcv_pkt_len -= actual_length;
	} while (rcv_pkt_len > 0);

	return 0;
fail:
	return -EINVAL;
}
EXPORT_SYMBOL_GPL(rsi_read_pkt);

/**
 * rsi_tx_scheduler_thread() - This function is a kernel thread to send the
 *			       packets to the device.
 * @common: Pointer to the driver private structure.
 *
 * Return: None.
 */
static void rsi_tx_scheduler_thread(struct rsi_common *common)
{
	struct rsi_hw *adapter = common->priv;
	u32 timeout = EVENT_WAIT_FOREVER;

	do {
		if (adapter->determine_event_timeout)
			timeout = adapter->determine_event_timeout(adapter);
		rsi_wait_event(&common->tx_thread.event, timeout);
		rsi_reset_event(&common->tx_thread.event);

		if (common->init_done)
			rsi_core_qos_processor(common);
	} while (atomic_read(&common->tx_thread.thread_done) == 0);
	complete_and_exit(&common->tx_thread.completion, 0);
}

/**
 * rsi_91x_init() - This function initializes os interface operations.
 * @void: Void.
 *
 * Return: Pointer to the adapter structure on success, NULL on failure .
 */
struct rsi_hw *rsi_91x_init(void)
{
	struct rsi_hw *adapter = NULL;
	struct rsi_common *common = NULL;
	u8 ii = 0;

	adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
	if (!adapter)
		return NULL;

	adapter->priv = kzalloc(sizeof(*common), GFP_KERNEL);
	if (adapter->priv == NULL) {
		rsi_dbg(ERR_ZONE, "%s: Failed in allocation of memory\n",
			__func__);
		kfree(adapter);
		return NULL;
	} else {
		common = adapter->priv;
		common->priv = adapter;
	}

	for (ii = 0; ii < NUM_SOFT_QUEUES; ii++)
		skb_queue_head_init(&common->tx_queue[ii]);

	rsi_init_event(&common->tx_thread.event);
	mutex_init(&common->mutex);
	mutex_init(&common->tx_rxlock);

	if (rsi_create_kthread(common,
			       &common->tx_thread,
			       rsi_tx_scheduler_thread,
			       "Tx-Thread")) {
		rsi_dbg(ERR_ZONE, "%s: Unable to init tx thrd\n", __func__);
		goto err;
	}

	common->init_done = true;
	return adapter;

err:
	kfree(common);
	kfree(adapter);
	return NULL;
}
EXPORT_SYMBOL_GPL(rsi_91x_init);

/**
 * rsi_91x_deinit() - This function de-intializes os intf operations.
 * @adapter: Pointer to the adapter structure.
 *
 * Return: None.
 */
void rsi_91x_deinit(struct rsi_hw *adapter)
{
	struct rsi_common *common = adapter->priv;
	u8 ii;

	rsi_dbg(INFO_ZONE, "%s: Performing deinit os ops\n", __func__);

	rsi_kill_thread(&common->tx_thread);

	for (ii = 0; ii < NUM_SOFT_QUEUES; ii++)
		skb_queue_purge(&common->tx_queue[ii]);

	common->init_done = false;

	kfree(common);
	kfree(adapter->rsi_dev);
	kfree(adapter);
}
EXPORT_SYMBOL_GPL(rsi_91x_deinit);

/**
 * rsi_91x_hal_module_init() - This function is invoked when the module is
 *			       loaded into the kernel.
 *			       It registers the client driver.
 * @void: Void.
 *
 * Return: 0 on success, -1 on failure.
 */
static int rsi_91x_hal_module_init(void)
{
	rsi_dbg(INIT_ZONE, "%s: Module init called\n", __func__);
	return 0;
}

/**
 * rsi_91x_hal_module_exit() - This function is called at the time of
 *			       removing/unloading the module.
 *			       It unregisters the client driver.
 * @void: Void.
 *
 * Return: None.
 */
static void rsi_91x_hal_module_exit(void)
{
	rsi_dbg(INIT_ZONE, "%s: Module exit called\n", __func__);
}

module_init(rsi_91x_hal_module_init);
module_exit(rsi_91x_hal_module_exit);
MODULE_AUTHOR("Redpine Signals Inc");
MODULE_DESCRIPTION("Station driver for RSI 91x devices");
MODULE_SUPPORTED_DEVICE("RSI-91x");
MODULE_VERSION("0.1");
MODULE_LICENSE("Dual BSD/GPL");