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  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
 24u32 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;
 34EXPORT_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 */
 43void 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}
 57EXPORT_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 */
 68static 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 */
111int 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		extended_desc = rsi_get_extended_desc(frame_desc, offset);
127
128		switch (queueno) {
129		case RSI_WIFI_DATA_Q:
130			skb = rsi_prepare_skb(common,
131					      (frame_desc + offset),
132					      length,
133					      extended_desc);
134			if (skb == NULL)
135				goto fail;
136
137			rsi_indicate_pkt_to_os(common, skb);
138			break;
139
140		case RSI_WIFI_MGMT_Q:
141			rsi_mgmt_pkt_recv(common, (frame_desc + offset));
142			break;
143
144		default:
145			rsi_dbg(ERR_ZONE, "%s: pkt from invalid queue: %d\n",
146				__func__,   queueno);
147			goto fail;
148		}
149
150		index  += actual_length;
151		rcv_pkt_len -= actual_length;
152	} while (rcv_pkt_len > 0);
153
154	return 0;
155fail:
156	return -EINVAL;
157}
158EXPORT_SYMBOL_GPL(rsi_read_pkt);
159
160/**
161 * rsi_tx_scheduler_thread() - This function is a kernel thread to send the
162 *			       packets to the device.
163 * @common: Pointer to the driver private structure.
164 *
165 * Return: None.
166 */
167static void rsi_tx_scheduler_thread(struct rsi_common *common)
168{
169	struct rsi_hw *adapter = common->priv;
170	u32 timeout = EVENT_WAIT_FOREVER;
171
172	do {
173		if (adapter->determine_event_timeout)
174			timeout = adapter->determine_event_timeout(adapter);
175		rsi_wait_event(&common->tx_thread.event, timeout);
176		rsi_reset_event(&common->tx_thread.event);
177
178		if (common->init_done)
179			rsi_core_qos_processor(common);
180	} while (atomic_read(&common->tx_thread.thread_done) == 0);
181	complete_and_exit(&common->tx_thread.completion, 0);
182}
183
184/**
185 * rsi_91x_init() - This function initializes os interface operations.
186 * @void: Void.
187 *
188 * Return: Pointer to the adapter structure on success, NULL on failure .
189 */
190struct rsi_hw *rsi_91x_init(void)
191{
192	struct rsi_hw *adapter = NULL;
193	struct rsi_common *common = NULL;
194	u8 ii = 0;
195
196	adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
197	if (!adapter)
198		return NULL;
199
200	adapter->priv = kzalloc(sizeof(*common), GFP_KERNEL);
201	if (adapter->priv == NULL) {
202		rsi_dbg(ERR_ZONE, "%s: Failed in allocation of memory\n",
203			__func__);
204		kfree(adapter);
205		return NULL;
206	} else {
207		common = adapter->priv;
208		common->priv = adapter;
209	}
210
211	for (ii = 0; ii < NUM_SOFT_QUEUES; ii++)
212		skb_queue_head_init(&common->tx_queue[ii]);
213
214	rsi_init_event(&common->tx_thread.event);
215	mutex_init(&common->mutex);
216	mutex_init(&common->tx_rxlock);
217
218	if (rsi_create_kthread(common,
219			       &common->tx_thread,
220			       rsi_tx_scheduler_thread,
221			       "Tx-Thread")) {
222		rsi_dbg(ERR_ZONE, "%s: Unable to init tx thrd\n", __func__);
223		goto err;
224	}
225
226	common->init_done = true;
227	return adapter;
228
229err:
230	kfree(common);
231	kfree(adapter);
232	return NULL;
233}
234EXPORT_SYMBOL_GPL(rsi_91x_init);
235
236/**
237 * rsi_91x_deinit() - This function de-intializes os intf operations.
238 * @adapter: Pointer to the adapter structure.
239 *
240 * Return: None.
241 */
242void rsi_91x_deinit(struct rsi_hw *adapter)
243{
244	struct rsi_common *common = adapter->priv;
245	u8 ii;
246
247	rsi_dbg(INFO_ZONE, "%s: Performing deinit os ops\n", __func__);
248
249	rsi_kill_thread(&common->tx_thread);
250
251	for (ii = 0; ii < NUM_SOFT_QUEUES; ii++)
252		skb_queue_purge(&common->tx_queue[ii]);
253
254	common->init_done = false;
255
256	kfree(common);
257	kfree(adapter->rsi_dev);
258	kfree(adapter);
259}
260EXPORT_SYMBOL_GPL(rsi_91x_deinit);
261
262/**
263 * rsi_91x_hal_module_init() - This function is invoked when the module is
264 *			       loaded into the kernel.
265 *			       It registers the client driver.
266 * @void: Void.
267 *
268 * Return: 0 on success, -1 on failure.
269 */
270static int rsi_91x_hal_module_init(void)
271{
272	rsi_dbg(INIT_ZONE, "%s: Module init called\n", __func__);
273	return 0;
274}
275
276/**
277 * rsi_91x_hal_module_exit() - This function is called at the time of
278 *			       removing/unloading the module.
279 *			       It unregisters the client driver.
280 * @void: Void.
281 *
282 * Return: None.
283 */
284static void rsi_91x_hal_module_exit(void)
285{
286	rsi_dbg(INIT_ZONE, "%s: Module exit called\n", __func__);
287}
288
289module_init(rsi_91x_hal_module_init);
290module_exit(rsi_91x_hal_module_exit);
291MODULE_AUTHOR("Redpine Signals Inc");
292MODULE_DESCRIPTION("Station driver for RSI 91x devices");
293MODULE_SUPPORTED_DEVICE("RSI-91x");
294MODULE_VERSION("0.1");
295MODULE_LICENSE("Dual BSD/GPL");