drivers/bluetooth/bcm203x.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *
   4  *  Broadcom Blutonium firmware driver
   5  *
   6  *  Copyright (C) 2003  Maxim Krasnyansky <maxk@qualcomm.com>
   7  *  Copyright (C) 2003  Marcel Holtmann <marcel@holtmann.org>
   8  */
   9
  10 #include <linux/module.h>
  11
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/slab.h>
  15 #include <linux/types.h>
  16 #include <linux/errno.h>
  17
  18 #include <linux/device.h>
  19 #include <linux/firmware.h>
  20
  21 #include <linux/usb.h>
  22
  23 #include <net/bluetooth/bluetooth.h>
  24
  25 #define VERSION "1.2"
  26
  27 static const struct usb_device_id bcm203x_table[] = {
  28         /* Broadcom Blutonium (BCM2033) */
  29         { USB_DEVICE(0x0a5c, 0x2033) },
  30
  31         { }     /* Terminating entry */
  32 };
  33
  34 MODULE_DEVICE_TABLE(usb, bcm203x_table);
  35
  36 #define BCM203X_ERROR           0
  37 #define BCM203X_RESET           1
  38 #define BCM203X_LOAD_MINIDRV    2
  39 #define BCM203X_SELECT_MEMORY   3
  40 #define BCM203X_CHECK_MEMORY    4
  41 #define BCM203X_LOAD_FIRMWARE   5
  42 #define BCM203X_CHECK_FIRMWARE  6
  43
  44 #define BCM203X_IN_EP           0x81
  45 #define BCM203X_OUT_EP          0x02
  46
  47 struct bcm203x_data {
  48         struct usb_device       *udev;
  49
  50         unsigned long           state;
  51
  52         struct work_struct      work;
  53         atomic_t                shutdown;
  54
  55         struct urb              *urb;
  56         unsigned char           *buffer;
  57
  58         unsigned char           *fw_data;
  59         unsigned int            fw_size;
  60         unsigned int            fw_sent;
  61 };
  62
  63 static void bcm203x_complete(struct urb *urb)
  64 {
  65         struct bcm203x_data *data = urb->context;
  66         struct usb_device *udev = urb->dev;
  67         int len;
  68
  69         BT_DBG("udev %p urb %p", udev, urb);
  70
  71         if (urb->status) {
  72                 BT_ERR("URB failed with status %d", urb->status);
  73                 data->state = BCM203X_ERROR;
  74                 return;
  75         }
  76
  77         switch (data->state) {
  78         case BCM203X_LOAD_MINIDRV:
  79                 memcpy(data->buffer, "#", 1);
  80
  81                 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, BCM203X_OUT_EP),
  82                                 data->buffer, 1, bcm203x_complete, data);
  83
  84                 data->state = BCM203X_SELECT_MEMORY;
  85
  86                 /* use workqueue to have a small delay */
  87                 schedule_work(&data->work);
  88                 break;
  89
  90         case BCM203X_SELECT_MEMORY:
  91                 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, BCM203X_IN_EP),
  92                                 data->buffer, 32, bcm203x_complete, data, 1);
  93
  94                 data->state = BCM203X_CHECK_MEMORY;
  95
  96                 if (usb_submit_urb(data->urb, GFP_ATOMIC) < 0)
  97                         BT_ERR("Can't submit URB");
  98                 break;
  99
 100         case BCM203X_CHECK_MEMORY:
 101                 if (data->buffer[0] != '#') {
 102                         BT_ERR("Memory select failed");
 103                         data->state = BCM203X_ERROR;
 104                         break;
 105                 }
 106
 107                 data->state = BCM203X_LOAD_FIRMWARE;
 108                 fallthrough;
 109         case BCM203X_LOAD_FIRMWARE:
 110                 if (data->fw_sent == data->fw_size) {
 111                         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, BCM203X_IN_EP),
 112                                 data->buffer, 32, bcm203x_complete, data, 1);
 113
 114                         data->state = BCM203X_CHECK_FIRMWARE;
 115                 } else {
 116                         len = min_t(uint, data->fw_size - data->fw_sent, 4096);
 117
 118                         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, BCM203X_OUT_EP),
 119                                 data->fw_data + data->fw_sent, len, bcm203x_complete, data);
 120
 121                         data->fw_sent += len;
 122                 }
 123
 124                 if (usb_submit_urb(data->urb, GFP_ATOMIC) < 0)
 125                         BT_ERR("Can't submit URB");
 126                 break;
 127
 128         case BCM203X_CHECK_FIRMWARE:
 129                 if (data->buffer[0] != '.') {
 130                         BT_ERR("Firmware loading failed");
 131                         data->state = BCM203X_ERROR;
 132                         break;
 133                 }
 134
 135                 data->state = BCM203X_RESET;
 136                 break;
 137         }
 138 }
 139
 140 static void bcm203x_work(struct work_struct *work)
 141 {
 142         struct bcm203x_data *data =
 143                 container_of(work, struct bcm203x_data, work);
 144
 145         if (atomic_read(&data->shutdown))
 146                 return;
 147
 148         if (usb_submit_urb(data->urb, GFP_KERNEL) < 0)
 149                 BT_ERR("Can't submit URB");
 150 }
 151
 152 static int bcm203x_probe(struct usb_interface *intf, const struct usb_device_id *id)
 153 {
 154         const struct firmware *firmware;
 155         struct usb_device *udev = interface_to_usbdev(intf);
 156         struct bcm203x_data *data;
 157         int size;
 158
 159         BT_DBG("intf %p id %p", intf, id);
 160
 161         if (intf->cur_altsetting->desc.bInterfaceNumber != 0)
 162                 return -ENODEV;
 163
 164         data = devm_kzalloc(&intf->dev, sizeof(*data), GFP_KERNEL);
 165         if (!data)
 166                 return -ENOMEM;
 167
 168         data->udev  = udev;
 169         data->state = BCM203X_LOAD_MINIDRV;
 170
 171         data->urb = usb_alloc_urb(0, GFP_KERNEL);
 172         if (!data->urb)
 173                 return -ENOMEM;
 174
 175         if (request_firmware(&firmware, "BCM2033-MD.hex", &udev->dev) < 0) {
 176                 BT_ERR("Mini driver request failed");
 177                 usb_free_urb(data->urb);
 178                 return -EIO;
 179         }
 180
 181         BT_DBG("minidrv data %p size %zu", firmware->data, firmware->size);
 182
 183         size = max_t(uint, firmware->size, 4096);
 184
 185         data->buffer = kmalloc(size, GFP_KERNEL);
 186         if (!data->buffer) {
 187                 BT_ERR("Can't allocate memory for mini driver");
 188                 release_firmware(firmware);
 189                 usb_free_urb(data->urb);
 190                 return -ENOMEM;
 191         }
 192
 193         memcpy(data->buffer, firmware->data, firmware->size);
 194
 195         usb_fill_bulk_urb(data->urb, udev, usb_sndbulkpipe(udev, BCM203X_OUT_EP),
 196                         data->buffer, firmware->size, bcm203x_complete, data);
 197
 198         release_firmware(firmware);
 199
 200         if (request_firmware(&firmware, "BCM2033-FW.bin", &udev->dev) < 0) {
 201                 BT_ERR("Firmware request failed");
 202                 usb_free_urb(data->urb);
 203                 kfree(data->buffer);
 204                 return -EIO;
 205         }
 206
 207         BT_DBG("firmware data %p size %zu", firmware->data, firmware->size);
 208
 209         data->fw_data = kmemdup(firmware->data, firmware->size, GFP_KERNEL);
 210         if (!data->fw_data) {
 211                 BT_ERR("Can't allocate memory for firmware image");
 212                 release_firmware(firmware);
 213                 usb_free_urb(data->urb);
 214                 kfree(data->buffer);
 215                 return -ENOMEM;
 216         }
 217
 218         data->fw_size = firmware->size;
 219         data->fw_sent = 0;
 220
 221         release_firmware(firmware);
 222
 223         INIT_WORK(&data->work, bcm203x_work);
 224
 225         usb_set_intfdata(intf, data);
 226
 227         /* use workqueue to have a small delay */
 228         schedule_work(&data->work);
 229
 230         return 0;
 231 }
 232
 233 static void bcm203x_disconnect(struct usb_interface *intf)
 234 {
 235         struct bcm203x_data *data = usb_get_intfdata(intf);
 236
 237         BT_DBG("intf %p", intf);
 238
 239         atomic_inc(&data->shutdown);
 240         cancel_work_sync(&data->work);
 241
 242         usb_kill_urb(data->urb);
 243
 244         usb_set_intfdata(intf, NULL);
 245
 246         usb_free_urb(data->urb);
 247         kfree(data->fw_data);
 248         kfree(data->buffer);
 249 }
 250
 251 static struct usb_driver bcm203x_driver = {
 252         .name           = "bcm203x",
 253         .probe          = bcm203x_probe,
 254         .disconnect     = bcm203x_disconnect,
 255         .id_table       = bcm203x_table,
 256         .disable_hub_initiated_lpm = 1,
 257 };
 258
 259 module_usb_driver(bcm203x_driver);
 260
 261 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 262 MODULE_DESCRIPTION("Broadcom Blutonium firmware driver ver " VERSION);
 263 MODULE_VERSION(VERSION);
 264 MODULE_LICENSE("GPL");
 265 MODULE_FIRMWARE("BCM2033-MD.hex");
 266 MODULE_FIRMWARE("BCM2033-FW.bin");