1 /**
2 * Copyright (c) 2014 Redpine Signals Inc.
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18
19 #include <linux/module.h>
20 #include <linux/firmware.h>
21 #include "rsi_mgmt.h"
22 #include "rsi_common.h"
23
24 u32 rsi_zone_enabled = /* INFO_ZONE |
25 INIT_ZONE |
26 MGMT_TX_ZONE |
27 MGMT_RX_ZONE |
28 DATA_TX_ZONE |
29 DATA_RX_ZONE |
30 FSM_ZONE |
31 ISR_ZONE | */
32 ERR_ZONE |
33 0;
34 EXPORT_SYMBOL_GPL(rsi_zone_enabled);
35
36 /**
37 * rsi_dbg() - This function outputs informational messages.
38 * @zone: Zone of interest for output message.
39 * @fmt: printf-style format for output message.
40 *
41 * Return: none
42 */
rsi_dbg(u32 zone,const char * fmt,...)43 void rsi_dbg(u32 zone, const char *fmt, ...)
44 {
45 struct va_format vaf;
46 va_list args;
47
48 va_start(args, fmt);
49
50 vaf.fmt = fmt;
51 vaf.va = &args;
52
53 if (zone & rsi_zone_enabled)
54 pr_info("%pV", &vaf);
55 va_end(args);
56 }
57 EXPORT_SYMBOL_GPL(rsi_dbg);
58
59 /**
60 * rsi_prepare_skb() - This function prepares the skb.
61 * @common: Pointer to the driver private structure.
62 * @buffer: Pointer to the packet data.
63 * @pkt_len: Length of the packet.
64 * @extended_desc: Extended descriptor.
65 *
66 * Return: Successfully skb.
67 */
rsi_prepare_skb(struct rsi_common * common,u8 * buffer,u32 pkt_len,u8 extended_desc)68 static struct sk_buff *rsi_prepare_skb(struct rsi_common *common,
69 u8 *buffer,
70 u32 pkt_len,
71 u8 extended_desc)
72 {
73 struct ieee80211_tx_info *info;
74 struct skb_info *rx_params;
75 struct sk_buff *skb = NULL;
76 u8 payload_offset;
77
78 if (WARN(!pkt_len, "%s: Dummy pkt received", __func__))
79 return NULL;
80
81 if (pkt_len > (RSI_RCV_BUFFER_LEN * 4)) {
82 rsi_dbg(ERR_ZONE, "%s: Pkt size > max rx buf size %d\n",
83 __func__, pkt_len);
84 pkt_len = RSI_RCV_BUFFER_LEN * 4;
85 }
86
87 pkt_len -= extended_desc;
88 skb = dev_alloc_skb(pkt_len + FRAME_DESC_SZ);
89 if (skb == NULL)
90 return NULL;
91
92 payload_offset = (extended_desc + FRAME_DESC_SZ);
93 skb_put(skb, pkt_len);
94 memcpy((skb->data), (buffer + payload_offset), skb->len);
95
96 info = IEEE80211_SKB_CB(skb);
97 rx_params = (struct skb_info *)info->driver_data;
98 rx_params->rssi = rsi_get_rssi(buffer);
99 rx_params->channel = rsi_get_connected_channel(common->priv);
100
101 return skb;
102 }
103
104 /**
105 * rsi_read_pkt() - This function reads frames from the card.
106 * @common: Pointer to the driver private structure.
107 * @rcv_pkt_len: Received pkt length. In case of USB it is 0.
108 *
109 * Return: 0 on success, -1 on failure.
110 */
rsi_read_pkt(struct rsi_common * common,s32 rcv_pkt_len)111 int rsi_read_pkt(struct rsi_common *common, s32 rcv_pkt_len)
112 {
113 u8 *frame_desc = NULL, extended_desc = 0;
114 u32 index, length = 0, queueno = 0;
115 u16 actual_length = 0, offset;
116 struct sk_buff *skb = NULL;
117
118 index = 0;
119 do {
120 frame_desc = &common->rx_data_pkt[index];
121 actual_length = *(u16 *)&frame_desc[0];
122 offset = *(u16 *)&frame_desc[2];
123
124 queueno = rsi_get_queueno(frame_desc, offset);
125 length = rsi_get_length(frame_desc, offset);
126
127 /* Extended descriptor is valid for WLAN queues only */
128 if (queueno == RSI_WIFI_DATA_Q || queueno == RSI_WIFI_MGMT_Q)
129 extended_desc = rsi_get_extended_desc(frame_desc,
130 offset);
131
132 switch (queueno) {
133 case RSI_COEX_Q:
134 rsi_mgmt_pkt_recv(common, (frame_desc + offset));
135 break;
136 case RSI_WIFI_DATA_Q:
137 skb = rsi_prepare_skb(common,
138 (frame_desc + offset),
139 length,
140 extended_desc);
141 if (skb == NULL)
142 goto fail;
143
144 rsi_indicate_pkt_to_os(common, skb);
145 break;
146
147 case RSI_WIFI_MGMT_Q:
148 rsi_mgmt_pkt_recv(common, (frame_desc + offset));
149 break;
150
151 default:
152 rsi_dbg(ERR_ZONE, "%s: pkt from invalid queue: %d\n",
153 __func__, queueno);
154 goto fail;
155 }
156
157 index += actual_length;
158 rcv_pkt_len -= actual_length;
159 } while (rcv_pkt_len > 0);
160
161 return 0;
162 fail:
163 return -EINVAL;
164 }
165 EXPORT_SYMBOL_GPL(rsi_read_pkt);
166
167 /**
168 * rsi_tx_scheduler_thread() - This function is a kernel thread to send the
169 * packets to the device.
170 * @common: Pointer to the driver private structure.
171 *
172 * Return: None.
173 */
rsi_tx_scheduler_thread(struct rsi_common * common)174 static void rsi_tx_scheduler_thread(struct rsi_common *common)
175 {
176 struct rsi_hw *adapter = common->priv;
177 u32 timeout = EVENT_WAIT_FOREVER;
178
179 do {
180 if (adapter->determine_event_timeout)
181 timeout = adapter->determine_event_timeout(adapter);
182 rsi_wait_event(&common->tx_thread.event, timeout);
183 rsi_reset_event(&common->tx_thread.event);
184
185 if (common->init_done)
186 rsi_core_qos_processor(common);
187 } while (atomic_read(&common->tx_thread.thread_done) == 0);
188 complete_and_exit(&common->tx_thread.completion, 0);
189 }
190
191 /**
192 * rsi_91x_init() - This function initializes os interface operations.
193 * @void: Void.
194 *
195 * Return: Pointer to the adapter structure on success, NULL on failure .
196 */
rsi_91x_init(void)197 struct rsi_hw *rsi_91x_init(void)
198 {
199 struct rsi_hw *adapter = NULL;
200 struct rsi_common *common = NULL;
201 u8 ii = 0;
202
203 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
204 if (!adapter)
205 return NULL;
206
207 adapter->priv = kzalloc(sizeof(*common), GFP_KERNEL);
208 if (adapter->priv == NULL) {
209 rsi_dbg(ERR_ZONE, "%s: Failed in allocation of memory\n",
210 __func__);
211 kfree(adapter);
212 return NULL;
213 } else {
214 common = adapter->priv;
215 common->priv = adapter;
216 }
217
218 for (ii = 0; ii < NUM_SOFT_QUEUES; ii++)
219 skb_queue_head_init(&common->tx_queue[ii]);
220
221 rsi_init_event(&common->tx_thread.event);
222 mutex_init(&common->mutex);
223 mutex_init(&common->tx_lock);
224 mutex_init(&common->rx_lock);
225
226 if (rsi_create_kthread(common,
227 &common->tx_thread,
228 rsi_tx_scheduler_thread,
229 "Tx-Thread")) {
230 rsi_dbg(ERR_ZONE, "%s: Unable to init tx thrd\n", __func__);
231 goto err;
232 }
233
234 rsi_default_ps_params(adapter);
235 spin_lock_init(&adapter->ps_lock);
236 common->init_done = true;
237 return adapter;
238
239 err:
240 kfree(common);
241 kfree(adapter);
242 return NULL;
243 }
244 EXPORT_SYMBOL_GPL(rsi_91x_init);
245
246 /**
247 * rsi_91x_deinit() - This function de-intializes os intf operations.
248 * @adapter: Pointer to the adapter structure.
249 *
250 * Return: None.
251 */
rsi_91x_deinit(struct rsi_hw * adapter)252 void rsi_91x_deinit(struct rsi_hw *adapter)
253 {
254 struct rsi_common *common = adapter->priv;
255 u8 ii;
256
257 rsi_dbg(INFO_ZONE, "%s: Performing deinit os ops\n", __func__);
258
259 rsi_kill_thread(&common->tx_thread);
260
261 for (ii = 0; ii < NUM_SOFT_QUEUES; ii++)
262 skb_queue_purge(&common->tx_queue[ii]);
263
264 common->init_done = false;
265
266 kfree(common);
267 kfree(adapter->rsi_dev);
268 kfree(adapter);
269 }
270 EXPORT_SYMBOL_GPL(rsi_91x_deinit);
271
272 /**
273 * rsi_91x_hal_module_init() - This function is invoked when the module is
274 * loaded into the kernel.
275 * It registers the client driver.
276 * @void: Void.
277 *
278 * Return: 0 on success, -1 on failure.
279 */
rsi_91x_hal_module_init(void)280 static int rsi_91x_hal_module_init(void)
281 {
282 rsi_dbg(INIT_ZONE, "%s: Module init called\n", __func__);
283 return 0;
284 }
285
286 /**
287 * rsi_91x_hal_module_exit() - This function is called at the time of
288 * removing/unloading the module.
289 * It unregisters the client driver.
290 * @void: Void.
291 *
292 * Return: None.
293 */
rsi_91x_hal_module_exit(void)294 static void rsi_91x_hal_module_exit(void)
295 {
296 rsi_dbg(INIT_ZONE, "%s: Module exit called\n", __func__);
297 }
298
299 module_init(rsi_91x_hal_module_init);
300 module_exit(rsi_91x_hal_module_exit);
301 MODULE_AUTHOR("Redpine Signals Inc");
302 MODULE_DESCRIPTION("Station driver for RSI 91x devices");
303 MODULE_SUPPORTED_DEVICE("RSI-91x");
304 MODULE_VERSION("0.1");
305 MODULE_LICENSE("Dual BSD/GPL");
306