2 * Copyright (c) 2014 Redpine Signals Inc.
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.
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.
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19 #include <linux/module.h>
20 #include <linux/firmware.h>
22 #include "rsi_common.h"
24 u32 rsi_zone_enabled = /* INFO_ZONE |
34 EXPORT_SYMBOL_GPL(rsi_zone_enabled);
37 * rsi_dbg() - This function outputs informational messages.
38 * @zone: Zone of interest for output message.
39 * @fmt: printf-style format for output message.
43 void rsi_dbg(u32 zone, const char *fmt, ...)
53 if (zone & rsi_zone_enabled)
57 EXPORT_SYMBOL_GPL(rsi_dbg);
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.
66 * Return: Successfully skb.
68 static struct sk_buff *rsi_prepare_skb(struct rsi_common *common,
73 struct ieee80211_tx_info *info;
74 struct skb_info *rx_params;
75 struct sk_buff *skb = NULL;
78 if (WARN(!pkt_len, "%s: Dummy pkt received", __func__))
81 if (pkt_len > (RSI_RCV_BUFFER_LEN * 4)) {
82 rsi_dbg(ERR_ZONE, "%s: Pkt size > max rx buf size %d\n",
84 pkt_len = RSI_RCV_BUFFER_LEN * 4;
87 pkt_len -= extended_desc;
88 skb = dev_alloc_skb(pkt_len + FRAME_DESC_SZ);
92 payload_offset = (extended_desc + FRAME_DESC_SZ);
93 skb_put(skb, pkt_len);
94 memcpy((skb->data), (buffer + payload_offset), skb->len);
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);
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.
109 * Return: 0 on success, -1 on failure.
111 int rsi_read_pkt(struct rsi_common *common, s32 rcv_pkt_len)
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;
120 frame_desc = &common->rx_data_pkt[index];
121 actual_length = *(u16 *)&frame_desc[0];
122 offset = *(u16 *)&frame_desc[2];
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);
129 case RSI_WIFI_DATA_Q:
130 skb = rsi_prepare_skb(common,
131 (frame_desc + offset),
137 rsi_indicate_pkt_to_os(common, skb);
140 case RSI_WIFI_MGMT_Q:
141 rsi_mgmt_pkt_recv(common, (frame_desc + offset));
145 rsi_dbg(ERR_ZONE, "%s: pkt from invalid queue: %d\n",
150 index += actual_length;
151 rcv_pkt_len -= actual_length;
152 } while (rcv_pkt_len > 0);
158 EXPORT_SYMBOL_GPL(rsi_read_pkt);
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.
167 static void rsi_tx_scheduler_thread(struct rsi_common *common)
169 struct rsi_hw *adapter = common->priv;
170 u32 timeout = EVENT_WAIT_FOREVER;
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);
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);
185 * rsi_91x_init() - This function initializes os interface operations.
188 * Return: Pointer to the adapter structure on success, NULL on failure .
190 struct rsi_hw *rsi_91x_init(void)
192 struct rsi_hw *adapter = NULL;
193 struct rsi_common *common = NULL;
196 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
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",
207 common = adapter->priv;
208 common->priv = adapter;
211 for (ii = 0; ii < NUM_SOFT_QUEUES; ii++)
212 skb_queue_head_init(&common->tx_queue[ii]);
214 rsi_init_event(&common->tx_thread.event);
215 mutex_init(&common->mutex);
216 mutex_init(&common->tx_rxlock);
218 if (rsi_create_kthread(common,
220 rsi_tx_scheduler_thread,
222 rsi_dbg(ERR_ZONE, "%s: Unable to init tx thrd\n", __func__);
226 common->init_done = true;
234 EXPORT_SYMBOL_GPL(rsi_91x_init);
237 * rsi_91x_deinit() - This function de-intializes os intf operations.
238 * @adapter: Pointer to the adapter structure.
242 void rsi_91x_deinit(struct rsi_hw *adapter)
244 struct rsi_common *common = adapter->priv;
247 rsi_dbg(INFO_ZONE, "%s: Performing deinit os ops\n", __func__);
249 rsi_kill_thread(&common->tx_thread);
251 for (ii = 0; ii < NUM_SOFT_QUEUES; ii++)
252 skb_queue_purge(&common->tx_queue[ii]);
254 common->init_done = false;
257 kfree(adapter->rsi_dev);
260 EXPORT_SYMBOL_GPL(rsi_91x_deinit);
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.
268 * Return: 0 on success, -1 on failure.
270 static int rsi_91x_hal_module_init(void)
272 rsi_dbg(INIT_ZONE, "%s: Module init called\n", __func__);
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.
284 static void rsi_91x_hal_module_exit(void)
286 rsi_dbg(INIT_ZONE, "%s: Module exit called\n", __func__);
289 module_init(rsi_91x_hal_module_init);
290 module_exit(rsi_91x_hal_module_exit);
291 MODULE_AUTHOR("Redpine Signals Inc");
292 MODULE_DESCRIPTION("Station driver for RSI 91x devices");
293 MODULE_SUPPORTED_DEVICE("RSI-91x");
294 MODULE_VERSION("0.1");
295 MODULE_LICENSE("Dual BSD/GPL");