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
226 #ifdef CONFIG_VIDEO_AU0828_V4L2
227 dev->v4l2_dev.release = au0828_usb_v4l2_release;
228
229 /* Create the v4l2_device */
230 retval = v4l2_device_register(&interface->dev, &dev->v4l2_dev);
231 if (retval) {
232 pr_err("%s() v4l2_device_register failed\n",
233 __func__);
234 mutex_unlock(&dev->lock);
235 kfree(dev);
236 return retval;
237 }
238 /* This control handler will inherit the controls from au8522 */
239 retval = v4l2_ctrl_handler_init(&dev->v4l2_ctrl_hdl, 4);
240 if (retval) {
241 pr_err("%s() v4l2_ctrl_handler_init failed\n",
242 __func__);
243 mutex_unlock(&dev->lock);
244 kfree(dev);
245 return retval;
246 }
247 dev->v4l2_dev.ctrl_handler = &dev->v4l2_ctrl_hdl;
248 #endif
249
250 /* Power Up the bridge */
251 au0828_write(dev, REG_600, 1 << 4);
252
253 /* Bring up the GPIO's and supporting devices */
254 au0828_gpio_setup(dev);
255
256 /* I2C */
257 au0828_i2c_register(dev);
258
259 /* Setup */
260 au0828_card_setup(dev);
261
262 #ifdef CONFIG_VIDEO_AU0828_V4L2
263 /* Analog TV */
264 if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED)
265 au0828_analog_register(dev, interface);
266 #endif
267
268 /* Digital TV */
269 retval = au0828_dvb_register(dev);
270 if (retval)
271 pr_err("%s() au0282_dev_register failed\n",
272 __func__);
273
274 /* Remote controller */
275 au0828_rc_register(dev);
276
277 /*
278 * Store the pointer to the au0828_dev so it can be accessed in
279 * au0828_usb_disconnect
280 */
281 usb_set_intfdata(interface, dev);
282
283 pr_info("Registered device AU0828 [%s]\n",
284 dev->board.name == NULL ? "Unset" : dev->board.name);
285
286 mutex_unlock(&dev->lock);
287
288 return retval;
289 }
290
au0828_suspend(struct usb_interface * interface,pm_message_t message)291 static int au0828_suspend(struct usb_interface *interface,
292 pm_message_t message)
293 {
294 struct au0828_dev *dev = usb_get_intfdata(interface);
295
296 if (!dev)
297 return 0;
298
299 pr_info("Suspend\n");
300
301 au0828_rc_suspend(dev);
302 au0828_v4l2_suspend(dev);
303 au0828_dvb_suspend(dev);
304
305 /* FIXME: should suspend also ATV/DTV */
306
307 return 0;
308 }
309
au0828_resume(struct usb_interface * interface)310 static int au0828_resume(struct usb_interface *interface)
311 {
312 struct au0828_dev *dev = usb_get_intfdata(interface);
313 if (!dev)
314 return 0;
315
316 pr_info("Resume\n");
317
318 /* Power Up the bridge */
319 au0828_write(dev, REG_600, 1 << 4);
320
321 /* Bring up the GPIO's and supporting devices */
322 au0828_gpio_setup(dev);
323
324 au0828_rc_resume(dev);
325 au0828_v4l2_resume(dev);
326 au0828_dvb_resume(dev);
327
328 /* FIXME: should resume also ATV/DTV */
329
330 return 0;
331 }
332
333 static struct usb_driver au0828_usb_driver = {
334 .name = KBUILD_MODNAME,
335 .probe = au0828_usb_probe,
336 .disconnect = au0828_usb_disconnect,
337 .id_table = au0828_usb_id_table,
338 .suspend = au0828_suspend,
339 .resume = au0828_resume,
340 .reset_resume = au0828_resume,
341 };
342
au0828_init(void)343 static int __init au0828_init(void)
344 {
345 int ret;
346
347 if (au0828_debug & 1)
348 pr_info("%s() Debugging is enabled\n", __func__);
349
350 if (au0828_debug & 2)
351 pr_info("%s() USB Debugging is enabled\n", __func__);
352
353 if (au0828_debug & 4)
354 pr_info("%s() I2C Debugging is enabled\n", __func__);
355
356 if (au0828_debug & 8)
357 pr_info("%s() Bridge Debugging is enabled\n",
358 __func__);
359
360 if (au0828_debug & 16)
361 pr_info("%s() IR Debugging is enabled\n",
362 __func__);
363
364 pr_info("au0828 driver loaded\n");
365
366 ret = usb_register(&au0828_usb_driver);
367 if (ret)
368 pr_err("usb_register failed, error = %d\n", ret);
369
370 return ret;
371 }
372
au0828_exit(void)373 static void __exit au0828_exit(void)
374 {
375 usb_deregister(&au0828_usb_driver);
376 }
377
378 module_init(au0828_init);
379 module_exit(au0828_exit);
380
381 MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products");
382 MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");
383 MODULE_LICENSE("GPL");
384 MODULE_VERSION("0.0.3");
385