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 "au0828.h"
23
24 #include <linux/module.h>
25 #include <linux/slab.h>
26 #include <linux/videodev2.h>
27 #include <media/v4l2-common.h>
28 #include <linux/mutex.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
au0828_readreg(struct au0828_dev * dev,u16 reg)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
au0828_writereg(struct au0828_dev * dev,u16 reg,u32 val)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
send_control_msg(struct au0828_dev * dev,u16 request,u32 value,u16 index)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 pr_err("%s() Failed sending control message, error %d.\n",
94 __func__, status);
95 }
96
97 }
98
99 return status;
100 }
101
recv_control_msg(struct au0828_dev * dev,u16 request,u32 value,u16 index,unsigned char * cp,u16 size)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 pr_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
au0828_usb_release(struct au0828_dev * dev)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
au0828_usb_v4l2_release(struct v4l2_device * v4l2_dev)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
au0828_usb_disconnect(struct usb_interface * interface)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 /* there is a small window after disconnect, before
157 dev->usbdev is NULL, for poll (e.g: IR) try to access
158 the device and fill the dmesg with error messages.
159 Set the status so poll routines can check and avoid
160 access after disconnect.
161 */
162 set_bit(DEV_DISCONNECTED, &dev->dev_state);
163
164 au0828_rc_unregister(dev);
165 /* Digital TV */
166 au0828_dvb_unregister(dev);
167
168 usb_set_intfdata(interface, NULL);
169 mutex_lock(&dev->mutex);
170 dev->usbdev = NULL;
171 mutex_unlock(&dev->mutex);
172 #ifdef CONFIG_VIDEO_AU0828_V4L2
173 if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED) {
174 au0828_analog_unregister(dev);
175 v4l2_device_disconnect(&dev->v4l2_dev);
176 v4l2_device_put(&dev->v4l2_dev);
177 return;
178 }
179 #endif
180 au0828_usb_release(dev);
181 }
182
au0828_usb_probe(struct usb_interface * interface,const struct usb_device_id * id)183 static int au0828_usb_probe(struct usb_interface *interface,
184 const struct usb_device_id *id)
185 {
186 int ifnum;
187 int retval = 0;
188
189 struct au0828_dev *dev;
190 struct usb_device *usbdev = interface_to_usbdev(interface);
191
192 ifnum = interface->altsetting->desc.bInterfaceNumber;
193
194 if (ifnum != 0)
195 return -ENODEV;
196
197 dprintk(1, "%s() vendor id 0x%x device id 0x%x ifnum:%d\n", __func__,
198 le16_to_cpu(usbdev->descriptor.idVendor),
199 le16_to_cpu(usbdev->descriptor.idProduct),
200 ifnum);
201
202 /*
203 * Make sure we have 480 Mbps of bandwidth, otherwise things like
204 * video stream wouldn't likely work, since 12 Mbps is generally
205 * not enough even for most Digital TV streams.
206 */
207 if (usbdev->speed != USB_SPEED_HIGH && disable_usb_speed_check == 0) {
208 pr_err("au0828: Device initialization failed.\n");
209 pr_err("au0828: Device must be connected to a high-speed USB 2.0 port.\n");
210 return -ENODEV;
211 }
212
213 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
214 if (dev == NULL) {
215 pr_err("%s() Unable to allocate memory\n", __func__);
216 return -ENOMEM;
217 }
218
219 mutex_init(&dev->lock);
220 mutex_lock(&dev->lock);
221 mutex_init(&dev->mutex);
222 mutex_init(&dev->dvb.lock);
223 dev->usbdev = usbdev;
224 dev->boardnr = id->driver_info;
225 dev->board = au0828_boards[dev->boardnr];
226
227
228 #ifdef CONFIG_VIDEO_AU0828_V4L2
229 dev->v4l2_dev.release = au0828_usb_v4l2_release;
230
231 /* Create the v4l2_device */
232 retval = v4l2_device_register(&interface->dev, &dev->v4l2_dev);
233 if (retval) {
234 pr_err("%s() v4l2_device_register failed\n",
235 __func__);
236 mutex_unlock(&dev->lock);
237 kfree(dev);
238 return retval;
239 }
240 /* This control handler will inherit the controls from au8522 */
241 retval = v4l2_ctrl_handler_init(&dev->v4l2_ctrl_hdl, 4);
242 if (retval) {
243 pr_err("%s() v4l2_ctrl_handler_init failed\n",
244 __func__);
245 mutex_unlock(&dev->lock);
246 kfree(dev);
247 return retval;
248 }
249 dev->v4l2_dev.ctrl_handler = &dev->v4l2_ctrl_hdl;
250 #endif
251
252 /* Power Up the bridge */
253 au0828_write(dev, REG_600, 1 << 4);
254
255 /* Bring up the GPIO's and supporting devices */
256 au0828_gpio_setup(dev);
257
258 /* I2C */
259 au0828_i2c_register(dev);
260
261 /* Setup */
262 au0828_card_setup(dev);
263
264 #ifdef CONFIG_VIDEO_AU0828_V4L2
265 /* Analog TV */
266 if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED)
267 au0828_analog_register(dev, interface);
268 #endif
269
270 /* Digital TV */
271 retval = au0828_dvb_register(dev);
272 if (retval)
273 pr_err("%s() au0282_dev_register failed\n",
274 __func__);
275
276 /* Remote controller */
277 au0828_rc_register(dev);
278
279 /*
280 * Store the pointer to the au0828_dev so it can be accessed in
281 * au0828_usb_disconnect
282 */
283 usb_set_intfdata(interface, dev);
284
285 pr_info("Registered device AU0828 [%s]\n",
286 dev->board.name == NULL ? "Unset" : dev->board.name);
287
288 mutex_unlock(&dev->lock);
289
290 return retval;
291 }
292
au0828_suspend(struct usb_interface * interface,pm_message_t message)293 static int au0828_suspend(struct usb_interface *interface,
294 pm_message_t message)
295 {
296 struct au0828_dev *dev = usb_get_intfdata(interface);
297
298 if (!dev)
299 return 0;
300
301 pr_info("Suspend\n");
302
303 au0828_rc_suspend(dev);
304 au0828_v4l2_suspend(dev);
305 au0828_dvb_suspend(dev);
306
307 /* FIXME: should suspend also ATV/DTV */
308
309 return 0;
310 }
311
au0828_resume(struct usb_interface * interface)312 static int au0828_resume(struct usb_interface *interface)
313 {
314 struct au0828_dev *dev = usb_get_intfdata(interface);
315 if (!dev)
316 return 0;
317
318 pr_info("Resume\n");
319
320 /* Power Up the bridge */
321 au0828_write(dev, REG_600, 1 << 4);
322
323 /* Bring up the GPIO's and supporting devices */
324 au0828_gpio_setup(dev);
325
326 au0828_rc_resume(dev);
327 au0828_v4l2_resume(dev);
328 au0828_dvb_resume(dev);
329
330 /* FIXME: should resume also ATV/DTV */
331
332 return 0;
333 }
334
335 static struct usb_driver au0828_usb_driver = {
336 .name = KBUILD_MODNAME,
337 .probe = au0828_usb_probe,
338 .disconnect = au0828_usb_disconnect,
339 .id_table = au0828_usb_id_table,
340 .suspend = au0828_suspend,
341 .resume = au0828_resume,
342 .reset_resume = au0828_resume,
343 };
344
au0828_init(void)345 static int __init au0828_init(void)
346 {
347 int ret;
348
349 if (au0828_debug & 1)
350 pr_info("%s() Debugging is enabled\n", __func__);
351
352 if (au0828_debug & 2)
353 pr_info("%s() USB Debugging is enabled\n", __func__);
354
355 if (au0828_debug & 4)
356 pr_info("%s() I2C Debugging is enabled\n", __func__);
357
358 if (au0828_debug & 8)
359 pr_info("%s() Bridge Debugging is enabled\n",
360 __func__);
361
362 if (au0828_debug & 16)
363 pr_info("%s() IR Debugging is enabled\n",
364 __func__);
365
366 pr_info("au0828 driver loaded\n");
367
368 ret = usb_register(&au0828_usb_driver);
369 if (ret)
370 pr_err("usb_register failed, error = %d\n", ret);
371
372 return ret;
373 }
374
au0828_exit(void)375 static void __exit au0828_exit(void)
376 {
377 usb_deregister(&au0828_usb_driver);
378 }
379
380 module_init(au0828_init);
381 module_exit(au0828_exit);
382
383 MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products");
384 MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");
385 MODULE_LICENSE("GPL");
386 MODULE_VERSION("0.0.3");
387