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"); 319