Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 1 | /* |
| 2 | * HCI_SMD (HCI Shared Memory Driver) is Qualcomm's Shared memory driver |
| 3 | * for the BT HCI protocol. |
| 4 | * |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 5 | * Copyright (c) 2000-2001, 2011-2012 Code Aurora Forum. All rights reserved. |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 6 | * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com> |
| 7 | * Copyright (C) 2004-2006 Marcel Holtmann <marcel@holtmann.org> |
| 8 | * |
| 9 | * This file is based on drivers/bluetooth/hci_vhci.c |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License version 2 |
| 13 | * as published by the Free Software Foundation |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | */ |
| 20 | |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/errno.h> |
Sunny Kapdi | 2a39b80 | 2012-05-30 12:47:14 -0700 | [diff] [blame^] | 25 | #include <linux/semaphore.h> |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 26 | #include <linux/string.h> |
| 27 | #include <linux/skbuff.h> |
Ankur Nandwani | 8ffe4e7 | 2011-10-10 21:51:48 -0700 | [diff] [blame] | 28 | #include <linux/wakelock.h> |
Sunny Kapdi | 02eab14 | 2012-02-01 13:52:27 -0800 | [diff] [blame] | 29 | #include <linux/workqueue.h> |
Ankur Nandwani | 8ffe4e7 | 2011-10-10 21:51:48 -0700 | [diff] [blame] | 30 | #include <linux/uaccess.h> |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 31 | #include <net/bluetooth/bluetooth.h> |
| 32 | #include <net/bluetooth/hci_core.h> |
| 33 | #include <net/bluetooth/hci.h> |
| 34 | #include <mach/msm_smd.h> |
| 35 | |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 36 | #define EVENT_CHANNEL "APPS_RIVA_BT_CMD" |
| 37 | #define DATA_CHANNEL "APPS_RIVA_BT_ACL" |
Mallikarjuna GB | 215561d | 2012-01-23 13:20:38 +0530 | [diff] [blame] | 38 | /* release wakelock in 500ms, not immediately, because higher layers |
| 39 | * don't always take wakelocks when they should |
| 40 | * This is derived from the implementation for UART transport |
| 41 | */ |
| 42 | |
| 43 | #define RX_Q_MONITOR (500) /* 500 milli second */ |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 44 | |
Ankur Nandwani | 8ffe4e7 | 2011-10-10 21:51:48 -0700 | [diff] [blame] | 45 | |
Ankur Nandwani | 8ffe4e7 | 2011-10-10 21:51:48 -0700 | [diff] [blame] | 46 | static int hcismd_set; |
Sunny Kapdi | 2a39b80 | 2012-05-30 12:47:14 -0700 | [diff] [blame^] | 47 | static DEFINE_SEMAPHORE(hci_smd_enable); |
| 48 | |
| 49 | static int restart_in_progress; |
Ankur Nandwani | 8ffe4e7 | 2011-10-10 21:51:48 -0700 | [diff] [blame] | 50 | |
| 51 | static int hcismd_set_enable(const char *val, struct kernel_param *kp); |
| 52 | module_param_call(hcismd_set, hcismd_set_enable, NULL, &hcismd_set, 0644); |
| 53 | |
Sunny Kapdi | d71fbed | 2012-03-15 18:20:55 -0700 | [diff] [blame] | 54 | static void hci_dev_smd_open(struct work_struct *worker); |
Sunny Kapdi | 02eab14 | 2012-02-01 13:52:27 -0800 | [diff] [blame] | 55 | static void hci_dev_restart(struct work_struct *worker); |
Ankur Nandwani | 8ffe4e7 | 2011-10-10 21:51:48 -0700 | [diff] [blame] | 56 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 57 | struct hci_smd_data { |
| 58 | struct hci_dev *hdev; |
| 59 | |
| 60 | struct smd_channel *event_channel; |
| 61 | struct smd_channel *data_channel; |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 62 | struct wake_lock wake_lock_tx; |
| 63 | struct wake_lock wake_lock_rx; |
| 64 | struct timer_list rx_q_timer; |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 65 | struct tasklet_struct rx_task; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 66 | }; |
Ankur Nandwani | 8ffe4e7 | 2011-10-10 21:51:48 -0700 | [diff] [blame] | 67 | static struct hci_smd_data hs; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 68 | |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 69 | /* Rx queue monitor timer function */ |
| 70 | static int is_rx_q_empty(unsigned long arg) |
| 71 | { |
| 72 | struct hci_dev *hdev = (struct hci_dev *) arg; |
| 73 | struct sk_buff_head *list_ = &hdev->rx_q; |
| 74 | struct sk_buff *list = ((struct sk_buff *)list_)->next; |
| 75 | BT_DBG("%s Rx timer triggered", hdev->name); |
| 76 | |
| 77 | if (list == (struct sk_buff *)list_) { |
| 78 | BT_DBG("%s RX queue empty", hdev->name); |
| 79 | return 1; |
| 80 | } else{ |
| 81 | BT_DBG("%s RX queue not empty", hdev->name); |
| 82 | return 0; |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | static void release_lock(void) |
| 87 | { |
| 88 | struct hci_smd_data *hsmd = &hs; |
| 89 | BT_DBG("Releasing Rx Lock"); |
| 90 | if (is_rx_q_empty((unsigned long)hsmd->hdev) && |
| 91 | wake_lock_active(&hs.wake_lock_rx)) |
| 92 | wake_unlock(&hs.wake_lock_rx); |
| 93 | } |
| 94 | |
| 95 | /* Rx timer callback function */ |
| 96 | static void schedule_timer(unsigned long arg) |
| 97 | { |
| 98 | struct hci_dev *hdev = (struct hci_dev *) arg; |
| 99 | struct hci_smd_data *hsmd = &hs; |
| 100 | BT_DBG("%s Schedule Rx timer", hdev->name); |
| 101 | |
| 102 | if (is_rx_q_empty(arg) && wake_lock_active(&hs.wake_lock_rx)) { |
| 103 | BT_DBG("%s RX queue empty", hdev->name); |
| 104 | /* |
| 105 | * Since the queue is empty, its ideal |
| 106 | * to release the wake lock on Rx |
| 107 | */ |
| 108 | wake_unlock(&hs.wake_lock_rx); |
| 109 | } else{ |
| 110 | BT_DBG("%s RX queue not empty", hdev->name); |
| 111 | /* |
| 112 | * Restart the timer to monitor whether the Rx queue is |
| 113 | * empty for releasing the Rx wake lock |
| 114 | */ |
| 115 | mod_timer(&hsmd->rx_q_timer, |
| 116 | jiffies + msecs_to_jiffies(RX_Q_MONITOR)); |
| 117 | } |
| 118 | } |
| 119 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 120 | static int hci_smd_open(struct hci_dev *hdev) |
| 121 | { |
| 122 | set_bit(HCI_RUNNING, &hdev->flags); |
| 123 | return 0; |
| 124 | } |
| 125 | |
| 126 | |
| 127 | static int hci_smd_close(struct hci_dev *hdev) |
| 128 | { |
| 129 | if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) |
| 130 | return 0; |
| 131 | else |
| 132 | return -EPERM; |
| 133 | } |
| 134 | |
| 135 | |
| 136 | static void hci_smd_destruct(struct hci_dev *hdev) |
| 137 | { |
Bhasker Neti | 60576c6 | 2011-12-07 18:45:51 -0800 | [diff] [blame] | 138 | if (NULL != hdev->driver_data) |
| 139 | kfree(hdev->driver_data); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 140 | } |
| 141 | |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 142 | static void hci_smd_recv_data(void) |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 143 | { |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 144 | int len = 0; |
| 145 | int rc = 0; |
| 146 | struct sk_buff *skb = NULL; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 147 | struct hci_smd_data *hsmd = &hs; |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 148 | wake_lock(&hs.wake_lock_rx); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 149 | |
| 150 | len = smd_read_avail(hsmd->data_channel); |
Bhasker Neti | 60734c0 | 2011-11-23 15:17:54 -0800 | [diff] [blame] | 151 | if (len > HCI_MAX_FRAME_SIZE) { |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 152 | BT_ERR("Frame larger than the allowed size, flushing frame"); |
| 153 | smd_read(hsmd->data_channel, NULL, len); |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 154 | goto out_data; |
| 155 | } |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 156 | |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 157 | if (len <= 0) |
| 158 | goto out_data; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 159 | |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 160 | skb = bt_skb_alloc(len, GFP_ATOMIC); |
| 161 | if (!skb) { |
| 162 | BT_ERR("Error in allocating socket buffer"); |
| 163 | smd_read(hsmd->data_channel, NULL, len); |
| 164 | goto out_data; |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 165 | } |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 166 | |
| 167 | rc = smd_read(hsmd->data_channel, skb_put(skb, len), len); |
| 168 | if (rc < len) { |
| 169 | BT_ERR("Error in reading from the channel"); |
| 170 | goto out_data; |
| 171 | } |
| 172 | |
| 173 | skb->dev = (void *)hsmd->hdev; |
| 174 | bt_cb(skb)->pkt_type = HCI_ACLDATA_PKT; |
| 175 | skb_orphan(skb); |
| 176 | |
| 177 | rc = hci_recv_frame(skb); |
| 178 | if (rc < 0) { |
| 179 | BT_ERR("Error in passing the packet to HCI Layer"); |
| 180 | /* |
| 181 | * skb is getting freed in hci_recv_frame, making it |
| 182 | * to null to avoid multiple access |
| 183 | */ |
| 184 | skb = NULL; |
| 185 | goto out_data; |
| 186 | } |
| 187 | |
| 188 | /* |
| 189 | * Start the timer to monitor whether the Rx queue is |
| 190 | * empty for releasing the Rx wake lock |
| 191 | */ |
| 192 | BT_DBG("Rx Timer is starting"); |
| 193 | mod_timer(&hsmd->rx_q_timer, |
| 194 | jiffies + msecs_to_jiffies(RX_Q_MONITOR)); |
| 195 | |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 196 | out_data: |
| 197 | release_lock(); |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 198 | if (rc) |
| 199 | kfree_skb(skb); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 200 | } |
| 201 | |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 202 | static void hci_smd_recv_event(void) |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 203 | { |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 204 | int len = 0; |
| 205 | int rc = 0; |
| 206 | struct sk_buff *skb = NULL; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 207 | struct hci_smd_data *hsmd = &hs; |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 208 | wake_lock(&hs.wake_lock_rx); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 209 | |
| 210 | len = smd_read_avail(hsmd->event_channel); |
| 211 | if (len > HCI_MAX_FRAME_SIZE) { |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 212 | BT_ERR("Frame larger than the allowed size, flushing frame"); |
| 213 | rc = smd_read(hsmd->event_channel, NULL, len); |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 214 | goto out_event; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 215 | } |
| 216 | |
| 217 | while (len > 0) { |
Ankur Nandwani | c815096 | 2011-08-24 13:06:23 -0700 | [diff] [blame] | 218 | skb = bt_skb_alloc(len, GFP_ATOMIC); |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 219 | if (!skb) { |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 220 | BT_ERR("Error in allocating socket buffer"); |
| 221 | smd_read(hsmd->event_channel, NULL, len); |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 222 | goto out_event; |
| 223 | } |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 224 | |
| 225 | rc = smd_read(hsmd->event_channel, skb_put(skb, len), len); |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 226 | if (rc < len) { |
| 227 | BT_ERR("Error in reading from the event channel"); |
| 228 | goto out_event; |
| 229 | } |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 230 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 231 | skb->dev = (void *)hsmd->hdev; |
| 232 | bt_cb(skb)->pkt_type = HCI_EVENT_PKT; |
| 233 | |
| 234 | skb_orphan(skb); |
| 235 | |
| 236 | rc = hci_recv_frame(skb); |
| 237 | if (rc < 0) { |
| 238 | BT_ERR("Error in passing the packet to HCI Layer"); |
Bhasker Neti | 44a792b | 2011-10-11 19:25:22 +0530 | [diff] [blame] | 239 | /* |
| 240 | * skb is getting freed in hci_recv_frame, making it |
| 241 | * to null to avoid multiple access |
| 242 | */ |
| 243 | skb = NULL; |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 244 | goto out_event; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 245 | } |
| 246 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 247 | len = smd_read_avail(hsmd->event_channel); |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 248 | /* |
| 249 | * Start the timer to monitor whether the Rx queue is |
| 250 | * empty for releasing the Rx wake lock |
| 251 | */ |
Bhasker Neti | 60734c0 | 2011-11-23 15:17:54 -0800 | [diff] [blame] | 252 | BT_DBG("Rx Timer is starting"); |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 253 | mod_timer(&hsmd->rx_q_timer, |
| 254 | jiffies + msecs_to_jiffies(RX_Q_MONITOR)); |
| 255 | } |
| 256 | out_event: |
| 257 | release_lock(); |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 258 | if (rc) |
| 259 | kfree_skb(skb); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 260 | } |
| 261 | |
| 262 | static int hci_smd_send_frame(struct sk_buff *skb) |
| 263 | { |
| 264 | int len; |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 265 | int avail; |
| 266 | int ret = 0; |
| 267 | wake_lock(&hs.wake_lock_tx); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 268 | |
| 269 | switch (bt_cb(skb)->pkt_type) { |
| 270 | case HCI_COMMAND_PKT: |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 271 | avail = smd_write_avail(hs.event_channel); |
| 272 | if (!avail) { |
| 273 | BT_ERR("No space available for smd frame"); |
| 274 | ret = -ENOSPC; |
| 275 | } |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 276 | len = smd_write(hs.event_channel, skb->data, skb->len); |
| 277 | if (len < skb->len) { |
| 278 | BT_ERR("Failed to write Command %d", len); |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 279 | ret = -ENODEV; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 280 | } |
| 281 | break; |
| 282 | case HCI_ACLDATA_PKT: |
| 283 | case HCI_SCODATA_PKT: |
Ankur Nandwani | 23abeb2 | 2011-10-26 16:35:22 -0700 | [diff] [blame] | 284 | avail = smd_write_avail(hs.data_channel); |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 285 | if (!avail) { |
| 286 | BT_ERR("No space available for smd frame"); |
| 287 | ret = -ENOSPC; |
| 288 | } |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 289 | len = smd_write(hs.data_channel, skb->data, skb->len); |
| 290 | if (len < skb->len) { |
| 291 | BT_ERR("Failed to write Data %d", len); |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 292 | ret = -ENODEV; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 293 | } |
| 294 | break; |
| 295 | default: |
Bhasker Neti | 60734c0 | 2011-11-23 15:17:54 -0800 | [diff] [blame] | 296 | BT_ERR("Uknown packet type"); |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 297 | ret = -ENODEV; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 298 | break; |
| 299 | } |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 300 | |
Anubhav Gupta | ddf48ec | 2011-10-03 14:24:13 +0530 | [diff] [blame] | 301 | kfree_skb(skb); |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 302 | wake_unlock(&hs.wake_lock_tx); |
| 303 | return ret; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 304 | } |
| 305 | |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 306 | static void hci_smd_rx(unsigned long arg) |
| 307 | { |
| 308 | struct hci_smd_data *hsmd = &hs; |
| 309 | |
| 310 | while ((smd_read_avail(hsmd->event_channel) > 0) || |
| 311 | (smd_read_avail(hsmd->data_channel) > 0)) { |
| 312 | hci_smd_recv_event(); |
| 313 | hci_smd_recv_data(); |
| 314 | } |
| 315 | } |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 316 | |
| 317 | static void hci_smd_notify_event(void *data, unsigned int event) |
| 318 | { |
| 319 | struct hci_dev *hdev = hs.hdev; |
Bhasker Neti | 60734c0 | 2011-11-23 15:17:54 -0800 | [diff] [blame] | 320 | struct hci_smd_data *hsmd = &hs; |
Sunny Kapdi | 02eab14 | 2012-02-01 13:52:27 -0800 | [diff] [blame] | 321 | struct work_struct *reset_worker; |
Sunny Kapdi | d71fbed | 2012-03-15 18:20:55 -0700 | [diff] [blame] | 322 | struct work_struct *open_worker; |
| 323 | |
Bhasker Neti | 60734c0 | 2011-11-23 15:17:54 -0800 | [diff] [blame] | 324 | int len = 0; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 325 | |
| 326 | if (!hdev) { |
| 327 | BT_ERR("Frame for unknown HCI device (hdev=NULL)"); |
| 328 | return; |
| 329 | } |
| 330 | |
| 331 | switch (event) { |
| 332 | case SMD_EVENT_DATA: |
Bhasker Neti | 60734c0 | 2011-11-23 15:17:54 -0800 | [diff] [blame] | 333 | len = smd_read_avail(hsmd->event_channel); |
| 334 | if (len > 0) |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 335 | tasklet_hi_schedule(&hs.rx_task); |
Bhasker Neti | 60734c0 | 2011-11-23 15:17:54 -0800 | [diff] [blame] | 336 | else if (len < 0) |
| 337 | BT_ERR("Failed to read event from smd %d", len); |
| 338 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 339 | break; |
| 340 | case SMD_EVENT_OPEN: |
Bhasker Neti | 60734c0 | 2011-11-23 15:17:54 -0800 | [diff] [blame] | 341 | BT_INFO("opening HCI-SMD channel :%s", EVENT_CHANNEL); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 342 | hci_smd_open(hdev); |
Sunny Kapdi | d71fbed | 2012-03-15 18:20:55 -0700 | [diff] [blame] | 343 | open_worker = kzalloc(sizeof(*open_worker), GFP_ATOMIC); |
| 344 | if (!open_worker) { |
| 345 | BT_ERR("Out of memory"); |
| 346 | break; |
| 347 | } |
| 348 | INIT_WORK(open_worker, hci_dev_smd_open); |
| 349 | schedule_work(open_worker); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 350 | break; |
| 351 | case SMD_EVENT_CLOSE: |
Bhasker Neti | 60734c0 | 2011-11-23 15:17:54 -0800 | [diff] [blame] | 352 | BT_INFO("Closing HCI-SMD channel :%s", EVENT_CHANNEL); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 353 | hci_smd_close(hdev); |
Sunny Kapdi | 02eab14 | 2012-02-01 13:52:27 -0800 | [diff] [blame] | 354 | reset_worker = kzalloc(sizeof(*reset_worker), GFP_ATOMIC); |
| 355 | if (!reset_worker) { |
| 356 | BT_ERR("Out of memory"); |
| 357 | break; |
| 358 | } |
| 359 | INIT_WORK(reset_worker, hci_dev_restart); |
| 360 | schedule_work(reset_worker); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 361 | break; |
| 362 | default: |
| 363 | break; |
| 364 | } |
| 365 | } |
| 366 | |
| 367 | static void hci_smd_notify_data(void *data, unsigned int event) |
| 368 | { |
| 369 | struct hci_dev *hdev = hs.hdev; |
Bhasker Neti | 60734c0 | 2011-11-23 15:17:54 -0800 | [diff] [blame] | 370 | struct hci_smd_data *hsmd = &hs; |
| 371 | int len = 0; |
| 372 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 373 | if (!hdev) { |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 374 | BT_ERR("Frame for unknown HCI device (hdev=NULL)"); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 375 | return; |
| 376 | } |
| 377 | |
| 378 | switch (event) { |
| 379 | case SMD_EVENT_DATA: |
Bhasker Neti | 60734c0 | 2011-11-23 15:17:54 -0800 | [diff] [blame] | 380 | len = smd_read_avail(hsmd->data_channel); |
| 381 | if (len > 0) |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 382 | tasklet_hi_schedule(&hs.rx_task); |
Bhasker Neti | 60734c0 | 2011-11-23 15:17:54 -0800 | [diff] [blame] | 383 | else if (len < 0) |
| 384 | BT_ERR("Failed to read data from smd %d", len); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 385 | break; |
| 386 | case SMD_EVENT_OPEN: |
Bhasker Neti | 60734c0 | 2011-11-23 15:17:54 -0800 | [diff] [blame] | 387 | BT_INFO("opening HCI-SMD channel :%s", DATA_CHANNEL); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 388 | hci_smd_open(hdev); |
| 389 | break; |
| 390 | case SMD_EVENT_CLOSE: |
Bhasker Neti | 60734c0 | 2011-11-23 15:17:54 -0800 | [diff] [blame] | 391 | BT_INFO("Closing HCI-SMD channel :%s", DATA_CHANNEL); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 392 | hci_smd_close(hdev); |
| 393 | break; |
| 394 | default: |
| 395 | break; |
| 396 | } |
| 397 | |
| 398 | } |
| 399 | |
Sunny Kapdi | d71fbed | 2012-03-15 18:20:55 -0700 | [diff] [blame] | 400 | static int hci_smd_hci_register_dev(struct hci_smd_data *hsmd) |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 401 | { |
Sunny Kapdi | d71fbed | 2012-03-15 18:20:55 -0700 | [diff] [blame] | 402 | struct hci_dev *hdev; |
| 403 | |
| 404 | hdev = hsmd->hdev; |
| 405 | |
| 406 | if (hci_register_dev(hdev) < 0) { |
| 407 | BT_ERR("Can't register HCI device"); |
| 408 | hci_free_dev(hdev); |
| 409 | hsmd->hdev = NULL; |
| 410 | return -ENODEV; |
| 411 | } |
| 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | static int hci_smd_register_smd(struct hci_smd_data *hsmd) |
| 416 | { |
| 417 | struct hci_dev *hdev; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 418 | int rc; |
| 419 | |
| 420 | /* Initialize and register HCI device */ |
Bhasker Neti | 60576c6 | 2011-12-07 18:45:51 -0800 | [diff] [blame] | 421 | hdev = hci_alloc_dev(); |
| 422 | if (!hdev) { |
| 423 | BT_ERR("Can't allocate HCI device"); |
| 424 | return -ENOMEM; |
Ankur Nandwani | 8ffe4e7 | 2011-10-10 21:51:48 -0700 | [diff] [blame] | 425 | } |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 426 | |
Bhasker Neti | 60576c6 | 2011-12-07 18:45:51 -0800 | [diff] [blame] | 427 | hsmd->hdev = hdev; |
| 428 | hdev->bus = HCI_SMD; |
| 429 | hdev->driver_data = NULL; |
| 430 | hdev->open = hci_smd_open; |
| 431 | hdev->close = hci_smd_close; |
| 432 | hdev->send = hci_smd_send_frame; |
| 433 | hdev->destruct = hci_smd_destruct; |
| 434 | hdev->owner = THIS_MODULE; |
| 435 | |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 436 | |
| 437 | tasklet_init(&hsmd->rx_task, |
| 438 | hci_smd_rx, (unsigned long) hsmd); |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 439 | /* |
| 440 | * Setup the timer to monitor whether the Rx queue is empty, |
| 441 | * to control the wake lock release |
| 442 | */ |
| 443 | setup_timer(&hsmd->rx_q_timer, schedule_timer, |
| 444 | (unsigned long) hsmd->hdev); |
| 445 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 446 | /* Open the SMD Channel and device and register the callback function */ |
| 447 | rc = smd_named_open_on_edge(EVENT_CHANNEL, SMD_APPS_WCNSS, |
| 448 | &hsmd->event_channel, hdev, hci_smd_notify_event); |
| 449 | if (rc < 0) { |
| 450 | BT_ERR("Cannot open the command channel"); |
| 451 | hci_free_dev(hdev); |
Sunny Kapdi | d71fbed | 2012-03-15 18:20:55 -0700 | [diff] [blame] | 452 | hsmd->hdev = NULL; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 453 | return -ENODEV; |
| 454 | } |
| 455 | |
| 456 | rc = smd_named_open_on_edge(DATA_CHANNEL, SMD_APPS_WCNSS, |
| 457 | &hsmd->data_channel, hdev, hci_smd_notify_data); |
| 458 | if (rc < 0) { |
Bhasker Neti | 60734c0 | 2011-11-23 15:17:54 -0800 | [diff] [blame] | 459 | BT_ERR("Failed to open the Data channel"); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 460 | hci_free_dev(hdev); |
Sunny Kapdi | d71fbed | 2012-03-15 18:20:55 -0700 | [diff] [blame] | 461 | hsmd->hdev = NULL; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 462 | return -ENODEV; |
| 463 | } |
| 464 | |
| 465 | /* Disable the read interrupts on the channel */ |
| 466 | smd_disable_read_intr(hsmd->event_channel); |
| 467 | smd_disable_read_intr(hsmd->data_channel); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 468 | return 0; |
| 469 | } |
| 470 | |
Bhasker Neti | 60576c6 | 2011-12-07 18:45:51 -0800 | [diff] [blame] | 471 | static void hci_smd_deregister_dev(struct hci_smd_data *hsmd) |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 472 | { |
Bhasker Neti | aae6146 | 2012-01-12 19:14:25 +0530 | [diff] [blame] | 473 | tasklet_kill(&hs.rx_task); |
| 474 | |
Royston Rodrigues | eee6c96 | 2011-12-22 16:42:45 +0530 | [diff] [blame] | 475 | if (hsmd->hdev) { |
| 476 | if (hci_unregister_dev(hsmd->hdev) < 0) |
| 477 | BT_ERR("Can't unregister HCI device %s", |
| 478 | hsmd->hdev->name); |
| 479 | |
| 480 | hci_free_dev(hsmd->hdev); |
| 481 | hsmd->hdev = NULL; |
| 482 | } |
| 483 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 484 | smd_close(hs.event_channel); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 485 | smd_close(hs.data_channel); |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 486 | |
Ankur Nandwani | 327e050 | 2011-11-11 15:47:25 -0800 | [diff] [blame] | 487 | if (wake_lock_active(&hs.wake_lock_rx)) |
| 488 | wake_unlock(&hs.wake_lock_rx); |
Bhasker Neti | 60576c6 | 2011-12-07 18:45:51 -0800 | [diff] [blame] | 489 | if (wake_lock_active(&hs.wake_lock_tx)) |
| 490 | wake_unlock(&hs.wake_lock_tx); |
Ankur Nandwani | 327e050 | 2011-11-11 15:47:25 -0800 | [diff] [blame] | 491 | |
Bhasker Neti | d08d901 | 2011-09-05 19:37:54 +0530 | [diff] [blame] | 492 | /*Destroy the timer used to monitor the Rx queue for emptiness */ |
Royston Rodrigues | eee6c96 | 2011-12-22 16:42:45 +0530 | [diff] [blame] | 493 | if (hs.rx_q_timer.function) { |
| 494 | del_timer_sync(&hs.rx_q_timer); |
| 495 | hs.rx_q_timer.function = NULL; |
| 496 | hs.rx_q_timer.data = 0; |
| 497 | } |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 498 | } |
| 499 | |
Sunny Kapdi | 02eab14 | 2012-02-01 13:52:27 -0800 | [diff] [blame] | 500 | static void hci_dev_restart(struct work_struct *worker) |
| 501 | { |
Sunny Kapdi | 2a39b80 | 2012-05-30 12:47:14 -0700 | [diff] [blame^] | 502 | down(&hci_smd_enable); |
| 503 | restart_in_progress = 1; |
Sunny Kapdi | 02eab14 | 2012-02-01 13:52:27 -0800 | [diff] [blame] | 504 | hci_smd_deregister_dev(&hs); |
Sunny Kapdi | d71fbed | 2012-03-15 18:20:55 -0700 | [diff] [blame] | 505 | hci_smd_register_smd(&hs); |
Sunny Kapdi | 2a39b80 | 2012-05-30 12:47:14 -0700 | [diff] [blame^] | 506 | up(&hci_smd_enable); |
Sunny Kapdi | d71fbed | 2012-03-15 18:20:55 -0700 | [diff] [blame] | 507 | kfree(worker); |
| 508 | } |
| 509 | |
| 510 | static void hci_dev_smd_open(struct work_struct *worker) |
| 511 | { |
Sunny Kapdi | 2a39b80 | 2012-05-30 12:47:14 -0700 | [diff] [blame^] | 512 | down(&hci_smd_enable); |
| 513 | if (restart_in_progress == 1) { |
| 514 | /* Allow wcnss to initialize */ |
| 515 | restart_in_progress = 0; |
| 516 | msleep(10000); |
| 517 | } |
Sunny Kapdi | d71fbed | 2012-03-15 18:20:55 -0700 | [diff] [blame] | 518 | hci_smd_hci_register_dev(&hs); |
Sunny Kapdi | 2a39b80 | 2012-05-30 12:47:14 -0700 | [diff] [blame^] | 519 | up(&hci_smd_enable); |
Sunny Kapdi | 02eab14 | 2012-02-01 13:52:27 -0800 | [diff] [blame] | 520 | kfree(worker); |
| 521 | } |
| 522 | |
Ankur Nandwani | 8ffe4e7 | 2011-10-10 21:51:48 -0700 | [diff] [blame] | 523 | static int hcismd_set_enable(const char *val, struct kernel_param *kp) |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 524 | { |
Ankur Nandwani | 8ffe4e7 | 2011-10-10 21:51:48 -0700 | [diff] [blame] | 525 | int ret = 0; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 526 | |
Sunny Kapdi | 2a39b80 | 2012-05-30 12:47:14 -0700 | [diff] [blame^] | 527 | pr_err("hcismd_set_enable %d", hcismd_set); |
| 528 | |
| 529 | down(&hci_smd_enable); |
Ankur Nandwani | 8ffe4e7 | 2011-10-10 21:51:48 -0700 | [diff] [blame] | 530 | |
| 531 | ret = param_set_int(val, kp); |
| 532 | |
| 533 | if (ret) |
| 534 | goto done; |
| 535 | |
| 536 | switch (hcismd_set) { |
| 537 | |
| 538 | case 1: |
Sunny Kapdi | 2a39b80 | 2012-05-30 12:47:14 -0700 | [diff] [blame^] | 539 | if (hs.hdev == NULL) |
| 540 | hci_smd_register_smd(&hs); |
Ankur Nandwani | 8ffe4e7 | 2011-10-10 21:51:48 -0700 | [diff] [blame] | 541 | break; |
| 542 | case 0: |
Bhasker Neti | 60576c6 | 2011-12-07 18:45:51 -0800 | [diff] [blame] | 543 | hci_smd_deregister_dev(&hs); |
Ankur Nandwani | 8ffe4e7 | 2011-10-10 21:51:48 -0700 | [diff] [blame] | 544 | break; |
| 545 | default: |
| 546 | ret = -EFAULT; |
| 547 | } |
| 548 | |
| 549 | done: |
Sunny Kapdi | 2a39b80 | 2012-05-30 12:47:14 -0700 | [diff] [blame^] | 550 | up(&hci_smd_enable); |
Ankur Nandwani | 8ffe4e7 | 2011-10-10 21:51:48 -0700 | [diff] [blame] | 551 | return ret; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 552 | } |
Bhasker Neti | 60576c6 | 2011-12-07 18:45:51 -0800 | [diff] [blame] | 553 | static int __init hci_smd_init(void) |
| 554 | { |
| 555 | wake_lock_init(&hs.wake_lock_rx, WAKE_LOCK_SUSPEND, |
| 556 | "msm_smd_Rx"); |
| 557 | wake_lock_init(&hs.wake_lock_tx, WAKE_LOCK_SUSPEND, |
| 558 | "msm_smd_Tx"); |
Sunny Kapdi | 2a39b80 | 2012-05-30 12:47:14 -0700 | [diff] [blame^] | 559 | restart_in_progress = 0; |
| 560 | hs.hdev = NULL; |
Bhasker Neti | 60576c6 | 2011-12-07 18:45:51 -0800 | [diff] [blame] | 561 | return 0; |
| 562 | } |
| 563 | module_init(hci_smd_init); |
Ankur Nandwani | 8ffe4e7 | 2011-10-10 21:51:48 -0700 | [diff] [blame] | 564 | |
Bhasker Neti | 60576c6 | 2011-12-07 18:45:51 -0800 | [diff] [blame] | 565 | static void __exit hci_smd_exit(void) |
| 566 | { |
| 567 | wake_lock_destroy(&hs.wake_lock_rx); |
| 568 | wake_lock_destroy(&hs.wake_lock_tx); |
| 569 | } |
| 570 | module_exit(hci_smd_exit); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 571 | |
| 572 | MODULE_AUTHOR("Ankur Nandwani <ankurn@codeaurora.org>"); |
| 573 | MODULE_DESCRIPTION("Bluetooth SMD driver"); |
| 574 | MODULE_LICENSE("GPL v2"); |