drivers/media/usb/au0828/au0828-core.c

   1 /*
   2  *  Driver for the Auvitek USB bridge
   3  *
   4  *  Copyright (c) 2008 Steven Toth <stoth@linuxtv.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/slab.h>
  24 #include <linux/videodev2.h>
  25 #include <media/v4l2-common.h>
  26 #include <linux/mutex.h>
  27
  28 #include "au0828.h"
  29
  30 /*
  31  * 1 = General debug messages
  32  * 2 = USB handling
  33  * 4 = I2C related
  34  * 8 = Bridge related
  35  */
  36 int au0828_debug;
  37 module_param_named(debug, au0828_debug, int, 0644);
  38 MODULE_PARM_DESC(debug, "enable debug messages");
  39
  40 static unsigned int disable_usb_speed_check;
  41 module_param(disable_usb_speed_check, int, 0444);
  42 MODULE_PARM_DESC(disable_usb_speed_check,
  43                  "override min bandwidth requirement of 480M bps");
  44
  45 #define _AU0828_BULKPIPE 0x03
  46 #define _BULKPIPESIZE 0xffff
  47
  48 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  49                             u16 index);
  50 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  51         u16 index, unsigned char *cp, u16 size);
  52
  53 /* USB Direction */
  54 #define CMD_REQUEST_IN          0x00
  55 #define CMD_REQUEST_OUT         0x01
  56
  57 u32 au0828_readreg(struct au0828_dev *dev, u16 reg)
  58 {
  59         u8 result = 0;
  60
  61         recv_control_msg(dev, CMD_REQUEST_IN, 0, reg, &result, 1);
  62         dprintk(8, "%s(0x%04x) = 0x%02x\n", __func__, reg, result);
  63
  64         return result;
  65 }
  66
  67 u32 au0828_writereg(struct au0828_dev *dev, u16 reg, u32 val)
  68 {
  69         dprintk(8, "%s(0x%04x, 0x%02x)\n", __func__, reg, val);
  70         return send_control_msg(dev, CMD_REQUEST_OUT, val, reg);
  71 }
  72
  73 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  74         u16 index)
  75 {
  76         int status = -ENODEV;
  77
  78         if (dev->usbdev) {
  79
  80                 /* cp must be memory that has been allocated by kmalloc */
  81                 status = usb_control_msg(dev->usbdev,
  82                                 usb_sndctrlpipe(dev->usbdev, 0),
  83                                 request,
  84                                 USB_DIR_OUT | USB_TYPE_VENDOR |
  85                                         USB_RECIP_DEVICE,
  86                                 value, index, NULL, 0, 1000);
  87
  88                 status = min(status, 0);
  89
  90                 if (status < 0) {
  91                         printk(KERN_ERR "%s() Failed sending control message, error %d.\n",
  92                                 __func__, status);
  93                 }
  94
  95         }
  96
  97         return status;
  98 }
  99
 100 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
 101         u16 index, unsigned char *cp, u16 size)
 102 {
 103         int status = -ENODEV;
 104         mutex_lock(&dev->mutex);
 105         if (dev->usbdev) {
 106                 status = usb_control_msg(dev->usbdev,
 107                                 usb_rcvctrlpipe(dev->usbdev, 0),
 108                                 request,
 109                                 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 110                                 value, index,
 111                                 dev->ctrlmsg, size, 1000);
 112
 113                 status = min(status, 0);
 114
 115                 if (status < 0) {
 116                         printk(KERN_ERR "%s() Failed receiving control message, error %d.\n",
 117                                 __func__, status);
 118                 }
 119
 120                 /* the host controller requires heap allocated memory, which
 121                    is why we didn't just pass "cp" into usb_control_msg */
 122                 memcpy(cp, dev->ctrlmsg, size);
 123         }
 124         mutex_unlock(&dev->mutex);
 125         return status;
 126 }
 127
 128 static void au0828_usb_release(struct au0828_dev *dev)
 129 {
 130         /* I2C */
 131         au0828_i2c_unregister(dev);
 132
 133         kfree(dev);
 134 }
 135
 136 #ifdef CONFIG_VIDEO_AU0828_V4L2
 137 static void au0828_usb_v4l2_release(struct v4l2_device *v4l2_dev)
 138 {
 139         struct au0828_dev *dev =
 140                 container_of(v4l2_dev, struct au0828_dev, v4l2_dev);
 141
 142         v4l2_ctrl_handler_free(&dev->v4l2_ctrl_hdl);
 143         v4l2_device_unregister(&dev->v4l2_dev);
 144         au0828_usb_release(dev);
 145 }
 146 #endif
 147
 148 static void au0828_usb_disconnect(struct usb_interface *interface)
 149 {
 150         struct au0828_dev *dev = usb_get_intfdata(interface);
 151
 152         dprintk(1, "%s()\n", __func__);
 153
 154         /* Digital TV */
 155         au0828_dvb_unregister(dev);
 156
 157         usb_set_intfdata(interface, NULL);
 158         mutex_lock(&dev->mutex);
 159         dev->usbdev = NULL;
 160         mutex_unlock(&dev->mutex);
 161 #ifdef CONFIG_VIDEO_AU0828_V4L2
 162         if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED) {
 163                 au0828_analog_unregister(dev);
 164                 v4l2_device_disconnect(&dev->v4l2_dev);
 165                 v4l2_device_put(&dev->v4l2_dev);
 166                 return;
 167         }
 168 #endif
 169         au0828_usb_release(dev);
 170 }
 171
 172 static int au0828_usb_probe(struct usb_interface *interface,
 173         const struct usb_device_id *id)
 174 {
 175         int ifnum;
 176 #ifdef CONFIG_VIDEO_AU0828_V4L2
 177         int retval;
 178 #endif
 179         struct au0828_dev *dev;
 180         struct usb_device *usbdev = interface_to_usbdev(interface);
 181
 182         ifnum = interface->altsetting->desc.bInterfaceNumber;
 183
 184         if (ifnum != 0)
 185                 return -ENODEV;
 186
 187         dprintk(1, "%s() vendor id 0x%x device id 0x%x ifnum:%d\n", __func__,
 188                 le16_to_cpu(usbdev->descriptor.idVendor),
 189                 le16_to_cpu(usbdev->descriptor.idProduct),
 190                 ifnum);
 191
 192         /*
 193          * Make sure we have 480 Mbps of bandwidth, otherwise things like
 194          * video stream wouldn't likely work, since 12 Mbps is generally
 195          * not enough even for most Digital TV streams.
 196          */
 197         if (usbdev->speed != USB_SPEED_HIGH && disable_usb_speed_check == 0) {
 198                 printk(KERN_ERR "au0828: Device initialization failed.\n");
 199                 printk(KERN_ERR "au0828: Device must be connected to a "
 200                        "high-speed USB 2.0 port.\n");
 201                 return -ENODEV;
 202         }
 203
 204         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 205         if (dev == NULL) {
 206                 printk(KERN_ERR "%s() Unable to allocate memory\n", __func__);
 207                 return -ENOMEM;
 208         }
 209
 210         mutex_init(&dev->lock);
 211         mutex_lock(&dev->lock);
 212         mutex_init(&dev->mutex);
 213         mutex_init(&dev->dvb.lock);
 214         dev->usbdev = usbdev;
 215         dev->boardnr = id->driver_info;
 216
 217 #ifdef CONFIG_VIDEO_AU0828_V4L2
 218         dev->v4l2_dev.release = au0828_usb_v4l2_release;
 219
 220         /* Create the v4l2_device */
 221         retval = v4l2_device_register(&interface->dev, &dev->v4l2_dev);
 222         if (retval) {
 223                 pr_err("%s() v4l2_device_register failed\n",
 224                        __func__);
 225                 mutex_unlock(&dev->lock);
 226                 kfree(dev);
 227                 return retval;
 228         }
 229         /* This control handler will inherit the controls from au8522 */
 230         retval = v4l2_ctrl_handler_init(&dev->v4l2_ctrl_hdl, 4);
 231         if (retval) {
 232                 pr_err("%s() v4l2_ctrl_handler_init failed\n",
 233                        __func__);
 234                 mutex_unlock(&dev->lock);
 235                 kfree(dev);
 236                 return retval;
 237         }
 238         dev->v4l2_dev.ctrl_handler = &dev->v4l2_ctrl_hdl;
 239 #endif
 240
 241         /* Power Up the bridge */
 242         au0828_write(dev, REG_600, 1 << 4);
 243
 244         /* Bring up the GPIO's and supporting devices */
 245         au0828_gpio_setup(dev);
 246
 247         /* I2C */
 248         au0828_i2c_register(dev);
 249
 250         /* Setup */
 251         au0828_card_setup(dev);
 252
 253 #ifdef CONFIG_VIDEO_AU0828_V4L2
 254         /* Analog TV */
 255         if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED)
 256                 au0828_analog_register(dev, interface);
 257 #endif
 258
 259         /* Digital TV */
 260         au0828_dvb_register(dev);
 261
 262         /* Store the pointer to the au0828_dev so it can be accessed in
 263            au0828_usb_disconnect */
 264         usb_set_intfdata(interface, dev);
 265
 266         printk(KERN_INFO "Registered device AU0828 [%s]\n",
 267                 dev->board.name == NULL ? "Unset" : dev->board.name);
 268
 269         mutex_unlock(&dev->lock);
 270
 271         return 0;
 272 }
 273
 274 static struct usb_driver au0828_usb_driver = {
 275         .name           = DRIVER_NAME,
 276         .probe          = au0828_usb_probe,
 277         .disconnect     = au0828_usb_disconnect,
 278         .id_table       = au0828_usb_id_table,
 279 };
 280
 281 static int __init au0828_init(void)
 282 {
 283         int ret;
 284
 285         if (au0828_debug & 1)
 286                 printk(KERN_INFO "%s() Debugging is enabled\n", __func__);
 287
 288         if (au0828_debug & 2)
 289                 printk(KERN_INFO "%s() USB Debugging is enabled\n", __func__);
 290
 291         if (au0828_debug & 4)
 292                 printk(KERN_INFO "%s() I2C Debugging is enabled\n", __func__);
 293
 294         if (au0828_debug & 8)
 295                 printk(KERN_INFO "%s() Bridge Debugging is enabled\n",
 296                        __func__);
 297
 298         printk(KERN_INFO "au0828 driver loaded\n");
 299
 300         ret = usb_register(&au0828_usb_driver);
 301         if (ret)
 302                 printk(KERN_ERR "usb_register failed, error = %d\n", ret);
 303
 304         return ret;
 305 }
 306
 307 static void __exit au0828_exit(void)
 308 {
 309         usb_deregister(&au0828_usb_driver);
 310 }
 311
 312 module_init(au0828_init);
 313 module_exit(au0828_exit);
 314
 315 MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products");
 316 MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");
 317 MODULE_LICENSE("GPL");
 318 MODULE_VERSION("0.0.2");