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  * 16 = IR related
  36  */
  37 int au0828_debug;
  38 module_param_named(debug, au0828_debug, int, 0644);
  39 MODULE_PARM_DESC(debug,
  40                  "set debug bitmask: 1=general, 2=USB, 4=I2C, 8=bridge, 16=IR");
  41
  42 static unsigned int disable_usb_speed_check;
  43 module_param(disable_usb_speed_check, int, 0444);
  44 MODULE_PARM_DESC(disable_usb_speed_check,
  45                  "override min bandwidth requirement of 480M bps");
  46
  47 #define _AU0828_BULKPIPE 0x03
  48 #define _BULKPIPESIZE 0xffff
  49
  50 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  51                             u16 index);
  52 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  53         u16 index, unsigned char *cp, u16 size);
  54
  55 /* USB Direction */
  56 #define CMD_REQUEST_IN          0x00
  57 #define CMD_REQUEST_OUT         0x01
  58
  59 u32 au0828_readreg(struct au0828_dev *dev, u16 reg)
  60 {
  61         u8 result = 0;
  62
  63         recv_control_msg(dev, CMD_REQUEST_IN, 0, reg, &result, 1);
  64         dprintk(8, "%s(0x%04x) = 0x%02x\n", __func__, reg, result);
  65
  66         return result;
  67 }
  68
  69 u32 au0828_writereg(struct au0828_dev *dev, u16 reg, u32 val)
  70 {
  71         dprintk(8, "%s(0x%04x, 0x%02x)\n", __func__, reg, val);
  72         return send_control_msg(dev, CMD_REQUEST_OUT, val, reg);
  73 }
  74
  75 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  76         u16 index)
  77 {
  78         int status = -ENODEV;
  79
  80         if (dev->usbdev) {
  81
  82                 /* cp must be memory that has been allocated by kmalloc */
  83                 status = usb_control_msg(dev->usbdev,
  84                                 usb_sndctrlpipe(dev->usbdev, 0),
  85                                 request,
  86                                 USB_DIR_OUT | USB_TYPE_VENDOR |
  87                                         USB_RECIP_DEVICE,
  88                                 value, index, NULL, 0, 1000);
  89
  90                 status = min(status, 0);
  91
  92                 if (status < 0) {
  93                         printk(KERN_ERR "%s() Failed sending control message, error %d.\n",
  94                                 __func__, status);
  95                 }
  96
  97         }
  98
  99         return status;
 100 }
 101
 102 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
 103         u16 index, unsigned char *cp, u16 size)
 104 {
 105         int status = -ENODEV;
 106         mutex_lock(&dev->mutex);
 107         if (dev->usbdev) {
 108                 status = usb_control_msg(dev->usbdev,
 109                                 usb_rcvctrlpipe(dev->usbdev, 0),
 110                                 request,
 111                                 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 112                                 value, index,
 113                                 dev->ctrlmsg, size, 1000);
 114
 115                 status = min(status, 0);
 116
 117                 if (status < 0) {
 118                         printk(KERN_ERR "%s() Failed receiving control message, error %d.\n",
 119                                 __func__, status);
 120                 }
 121
 122                 /* the host controller requires heap allocated memory, which
 123                    is why we didn't just pass "cp" into usb_control_msg */
 124                 memcpy(cp, dev->ctrlmsg, size);
 125         }
 126         mutex_unlock(&dev->mutex);
 127         return status;
 128 }
 129
 130 static void au0828_usb_release(struct au0828_dev *dev)
 131 {
 132         /* I2C */
 133         au0828_i2c_unregister(dev);
 134
 135         kfree(dev);
 136 }
 137
 138 #ifdef CONFIG_VIDEO_AU0828_V4L2
 139 static void au0828_usb_v4l2_release(struct v4l2_device *v4l2_dev)
 140 {
 141         struct au0828_dev *dev =
 142                 container_of(v4l2_dev, struct au0828_dev, v4l2_dev);
 143
 144         v4l2_ctrl_handler_free(&dev->v4l2_ctrl_hdl);
 145         v4l2_device_unregister(&dev->v4l2_dev);
 146         au0828_usb_release(dev);
 147 }
 148 #endif
 149
 150 static void au0828_usb_disconnect(struct usb_interface *interface)
 151 {
 152         struct au0828_dev *dev = usb_get_intfdata(interface);
 153
 154         dprintk(1, "%s()\n", __func__);
 155
 156 #ifdef CONFIG_VIDEO_AU0828_RC
 157         au0828_rc_unregister(dev);
 158 #endif
 159         /* Digital TV */
 160         au0828_dvb_unregister(dev);
 161
 162         usb_set_intfdata(interface, NULL);
 163         mutex_lock(&dev->mutex);
 164         dev->usbdev = NULL;
 165         mutex_unlock(&dev->mutex);
 166 #ifdef CONFIG_VIDEO_AU0828_V4L2
 167         if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED) {
 168                 au0828_analog_unregister(dev);
 169                 v4l2_device_disconnect(&dev->v4l2_dev);
 170                 v4l2_device_put(&dev->v4l2_dev);
 171                 return;
 172         }
 173 #endif
 174         au0828_usb_release(dev);
 175 }
 176
 177 static int au0828_usb_probe(struct usb_interface *interface,
 178         const struct usb_device_id *id)
 179 {
 180         int ifnum;
 181         int retval = 0;
 182
 183         struct au0828_dev *dev;
 184         struct usb_device *usbdev = interface_to_usbdev(interface);
 185
 186         ifnum = interface->altsetting->desc.bInterfaceNumber;
 187
 188         if (ifnum != 0)
 189                 return -ENODEV;
 190
 191         dprintk(1, "%s() vendor id 0x%x device id 0x%x ifnum:%d\n", __func__,
 192                 le16_to_cpu(usbdev->descriptor.idVendor),
 193                 le16_to_cpu(usbdev->descriptor.idProduct),
 194                 ifnum);
 195
 196         /*
 197          * Make sure we have 480 Mbps of bandwidth, otherwise things like
 198          * video stream wouldn't likely work, since 12 Mbps is generally
 199          * not enough even for most Digital TV streams.
 200          */
 201         if (usbdev->speed != USB_SPEED_HIGH && disable_usb_speed_check == 0) {
 202                 printk(KERN_ERR "au0828: Device initialization failed.\n");
 203                 printk(KERN_ERR "au0828: Device must be connected to a "
 204                        "high-speed USB 2.0 port.\n");
 205                 return -ENODEV;
 206         }
 207
 208         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 209         if (dev == NULL) {
 210                 printk(KERN_ERR "%s() Unable to allocate memory\n", __func__);
 211                 return -ENOMEM;
 212         }
 213
 214         mutex_init(&dev->lock);
 215         mutex_lock(&dev->lock);
 216         mutex_init(&dev->mutex);
 217         mutex_init(&dev->dvb.lock);
 218         dev->usbdev = usbdev;
 219         dev->boardnr = id->driver_info;
 220
 221 #ifdef CONFIG_VIDEO_AU0828_V4L2
 222         dev->v4l2_dev.release = au0828_usb_v4l2_release;
 223
 224         /* Create the v4l2_device */
 225         retval = v4l2_device_register(&interface->dev, &dev->v4l2_dev);
 226         if (retval) {
 227                 pr_err("%s() v4l2_device_register failed\n",
 228                        __func__);
 229                 mutex_unlock(&dev->lock);
 230                 kfree(dev);
 231                 return retval;
 232         }
 233         /* This control handler will inherit the controls from au8522 */
 234         retval = v4l2_ctrl_handler_init(&dev->v4l2_ctrl_hdl, 4);
 235         if (retval) {
 236                 pr_err("%s() v4l2_ctrl_handler_init failed\n",
 237                        __func__);
 238                 mutex_unlock(&dev->lock);
 239                 kfree(dev);
 240                 return retval;
 241         }
 242         dev->v4l2_dev.ctrl_handler = &dev->v4l2_ctrl_hdl;
 243 #endif
 244
 245         /* Power Up the bridge */
 246         au0828_write(dev, REG_600, 1 << 4);
 247
 248         /* Bring up the GPIO's and supporting devices */
 249         au0828_gpio_setup(dev);
 250
 251         /* I2C */
 252         au0828_i2c_register(dev);
 253
 254         /* Setup */
 255         au0828_card_setup(dev);
 256
 257 #ifdef CONFIG_VIDEO_AU0828_V4L2
 258         /* Analog TV */
 259         if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED)
 260                 au0828_analog_register(dev, interface);
 261 #endif
 262
 263         /* Digital TV */
 264         retval = au0828_dvb_register(dev);
 265         if (retval)
 266                 pr_err("%s() au0282_dev_register failed\n",
 267                        __func__);
 268
 269 #ifdef CONFIG_VIDEO_AU0828_RC
 270         /* Remote controller */
 271         au0828_rc_register(dev);
 272 #endif
 273
 274         /*
 275          * Store the pointer to the au0828_dev so it can be accessed in
 276          * au0828_usb_disconnect
 277          */
 278         usb_set_intfdata(interface, dev);
 279
 280         printk(KERN_INFO "Registered device AU0828 [%s]\n",
 281                 dev->board.name == NULL ? "Unset" : dev->board.name);
 282
 283         mutex_unlock(&dev->lock);
 284
 285         return retval;
 286 }
 287
 288 static struct usb_driver au0828_usb_driver = {
 289         .name           = DRIVER_NAME,
 290         .probe          = au0828_usb_probe,
 291         .disconnect     = au0828_usb_disconnect,
 292         .id_table       = au0828_usb_id_table,
 293
 294         /* FIXME: Add suspend and resume functions */
 295 };
 296
 297 static int __init au0828_init(void)
 298 {
 299         int ret;
 300
 301         if (au0828_debug & 1)
 302                 printk(KERN_INFO "%s() Debugging is enabled\n", __func__);
 303
 304         if (au0828_debug & 2)
 305                 printk(KERN_INFO "%s() USB Debugging is enabled\n", __func__);
 306
 307         if (au0828_debug & 4)
 308                 printk(KERN_INFO "%s() I2C Debugging is enabled\n", __func__);
 309
 310         if (au0828_debug & 8)
 311                 printk(KERN_INFO "%s() Bridge Debugging is enabled\n",
 312                        __func__);
 313
 314         if (au0828_debug & 16)
 315                 printk(KERN_INFO "%s() IR Debugging is enabled\n",
 316                        __func__);
 317
 318         printk(KERN_INFO "au0828 driver loaded\n");
 319
 320         ret = usb_register(&au0828_usb_driver);
 321         if (ret)
 322                 printk(KERN_ERR "usb_register failed, error = %d\n", ret);
 323
 324         return ret;
 325 }
 326
 327 static void __exit au0828_exit(void)
 328 {
 329         usb_deregister(&au0828_usb_driver);
 330 }
 331
 332 module_init(au0828_init);
 333 module_exit(au0828_exit);
 334
 335 MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products");
 336 MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");
 337 MODULE_LICENSE("GPL");
 338 MODULE_VERSION("0.0.3");