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- /*
- * STK1160 driver
- *
- * Copyright (C) 2012 Ezequiel Garcia
- * <elezegarcia--a.t--gmail.com>
- *
- * Based on Easycap driver by R.M. Thomas
- * Copyright (C) 2010 R.M. Thomas
- * <rmthomas--a.t--sciolus.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * TODO:
- *
- * 1. Support stream at lower speed: lower frame rate or lower frame size.
- *
- */
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/errno.h>
- #include <linux/slab.h>
- #include <linux/usb.h>
- #include <linux/mm.h>
- #include <linux/vmalloc.h>
- #include <media/i2c/saa7115.h>
- #include "stk1160.h"
- #include "stk1160-reg.h"
- static unsigned int input;
- module_param(input, int, 0644);
- MODULE_PARM_DESC(input, "Set default input");
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Ezequiel Garcia");
- MODULE_DESCRIPTION("STK1160 driver");
- /* Devices supported by this driver */
- static const struct usb_device_id stk1160_id_table[] = {
- { USB_DEVICE(0x05e1, 0x0408) },
- { }
- };
- MODULE_DEVICE_TABLE(usb, stk1160_id_table);
- /* saa7113 I2C address */
- static unsigned short saa7113_addrs[] = {
- 0x4a >> 1,
- I2C_CLIENT_END
- };
- /*
- * Read/Write stk registers
- */
- int stk1160_read_reg(struct stk1160 *dev, u16 reg, u8 *value)
- {
- int ret;
- int pipe = usb_rcvctrlpipe(dev->udev, 0);
- u8 *buf;
- *value = 0;
- buf = kmalloc(sizeof(u8), GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
- ret = usb_control_msg(dev->udev, pipe, 0x00,
- USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
- 0x00, reg, buf, sizeof(u8), HZ);
- if (ret < 0) {
- stk1160_err("read failed on reg 0x%x (%d)\n",
- reg, ret);
- kfree(buf);
- return ret;
- }
- *value = *buf;
- kfree(buf);
- return 0;
- }
- int stk1160_write_reg(struct stk1160 *dev, u16 reg, u16 value)
- {
- int ret;
- int pipe = usb_sndctrlpipe(dev->udev, 0);
- ret = usb_control_msg(dev->udev, pipe, 0x01,
- USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
- value, reg, NULL, 0, HZ);
- if (ret < 0) {
- stk1160_err("write failed on reg 0x%x (%d)\n",
- reg, ret);
- return ret;
- }
- return 0;
- }
- void stk1160_select_input(struct stk1160 *dev)
- {
- int route;
- static const u8 gctrl[] = {
- 0x98, 0x90, 0x88, 0x80, 0x98
- };
- if (dev->ctl_input == STK1160_SVIDEO_INPUT)
- route = SAA7115_SVIDEO3;
- else
- route = SAA7115_COMPOSITE0;
- if (dev->ctl_input < ARRAY_SIZE(gctrl)) {
- v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_routing,
- route, 0, 0);
- stk1160_write_reg(dev, STK1160_GCTRL, gctrl[dev->ctl_input]);
- }
- }
- /* TODO: We should break this into pieces */
- static void stk1160_reg_reset(struct stk1160 *dev)
- {
- int i;
- static const struct regval ctl[] = {
- {STK1160_GCTRL+2, 0x0078},
- {STK1160_RMCTL+1, 0x0000},
- {STK1160_RMCTL+3, 0x0002},
- {STK1160_PLLSO, 0x0010},
- {STK1160_PLLSO+1, 0x0000},
- {STK1160_PLLSO+2, 0x0014},
- {STK1160_PLLSO+3, 0x000E},
- {STK1160_PLLFD, 0x0046},
- /* Timing generator setup */
- {STK1160_TIGEN, 0x0012},
- {STK1160_TICTL, 0x002D},
- {STK1160_TICTL+1, 0x0001},
- {STK1160_TICTL+2, 0x0000},
- {STK1160_TICTL+3, 0x0000},
- {STK1160_TIGEN, 0x0080},
- {0xffff, 0xffff}
- };
- for (i = 0; ctl[i].reg != 0xffff; i++)
- stk1160_write_reg(dev, ctl[i].reg, ctl[i].val);
- }
- static void stk1160_release(struct v4l2_device *v4l2_dev)
- {
- struct stk1160 *dev = container_of(v4l2_dev, struct stk1160, v4l2_dev);
- stk1160_dbg("releasing all resources\n");
- stk1160_i2c_unregister(dev);
- v4l2_ctrl_handler_free(&dev->ctrl_handler);
- v4l2_device_unregister(&dev->v4l2_dev);
- mutex_destroy(&dev->v4l_lock);
- mutex_destroy(&dev->vb_queue_lock);
- kfree(dev->alt_max_pkt_size);
- kfree(dev);
- }
- /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
- #define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
- /*
- * Scan usb interface and populate max_pkt_size array
- * with information on each alternate setting.
- * The array should be allocated by the caller.
- */
- static int stk1160_scan_usb(struct usb_interface *intf, struct usb_device *udev,
- unsigned int *max_pkt_size)
- {
- int i, e, sizedescr, size, ifnum;
- const struct usb_endpoint_descriptor *desc;
- bool has_video = false, has_audio = false;
- const char *speed;
- ifnum = intf->altsetting[0].desc.bInterfaceNumber;
- /* Get endpoints */
- for (i = 0; i < intf->num_altsetting; i++) {
- for (e = 0; e < intf->altsetting[i].desc.bNumEndpoints; e++) {
- /* This isn't clear enough, at least to me */
- desc = &intf->altsetting[i].endpoint[e].desc;
- sizedescr = le16_to_cpu(desc->wMaxPacketSize);
- size = sizedescr & 0x7ff;
- if (udev->speed == USB_SPEED_HIGH)
- size = size * hb_mult(sizedescr);
- if (usb_endpoint_xfer_isoc(desc) &&
- usb_endpoint_dir_in(desc)) {
- switch (desc->bEndpointAddress) {
- case STK1160_EP_AUDIO:
- has_audio = true;
- break;
- case STK1160_EP_VIDEO:
- has_video = true;
- max_pkt_size[i] = size;
- break;
- }
- }
- }
- }
- /* Is this even possible? */
- if (!(has_audio || has_video)) {
- dev_err(&udev->dev, "no audio or video endpoints found\n");
- return -ENODEV;
- }
- switch (udev->speed) {
- case USB_SPEED_LOW:
- speed = "1.5";
- break;
- case USB_SPEED_FULL:
- speed = "12";
- break;
- case USB_SPEED_HIGH:
- speed = "480";
- break;
- default:
- speed = "unknown";
- }
- dev_info(&udev->dev, "New device %s %s @ %s Mbps (%04x:%04x, interface %d, class %d)\n",
- udev->manufacturer ? udev->manufacturer : "",
- udev->product ? udev->product : "",
- speed,
- le16_to_cpu(udev->descriptor.idVendor),
- le16_to_cpu(udev->descriptor.idProduct),
- ifnum,
- intf->altsetting->desc.bInterfaceNumber);
- /* This should never happen, since we rejected audio interfaces */
- if (has_audio)
- dev_warn(&udev->dev, "audio interface %d found.\n\
- This is not implemented by this driver,\
- you should use snd-usb-audio instead\n", ifnum);
- if (has_video)
- dev_info(&udev->dev, "video interface %d found\n",
- ifnum);
- /*
- * Make sure we have 480 Mbps of bandwidth, otherwise things like
- * video stream wouldn't likely work, since 12 Mbps is generally
- * not enough even for most streams.
- */
- if (udev->speed != USB_SPEED_HIGH)
- dev_warn(&udev->dev, "must be connected to a high-speed USB 2.0 port\n\
- You may not be able to stream video smoothly\n");
- return 0;
- }
- static int stk1160_probe(struct usb_interface *interface,
- const struct usb_device_id *id)
- {
- int rc = 0;
- unsigned int *alt_max_pkt_size; /* array of wMaxPacketSize */
- struct usb_device *udev;
- struct stk1160 *dev;
- udev = interface_to_usbdev(interface);
- /*
- * Since usb audio class is supported by snd-usb-audio,
- * we reject audio interface.
- */
- if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO)
- return -ENODEV;
- /* Alloc an array for all possible max_pkt_size */
- alt_max_pkt_size = kmalloc_array(interface->num_altsetting,
- sizeof(alt_max_pkt_size[0]),
- GFP_KERNEL);
- if (alt_max_pkt_size == NULL)
- return -ENOMEM;
- /*
- * Scan usb posibilities and populate alt_max_pkt_size array.
- * Also, check if device speed is fast enough.
- */
- rc = stk1160_scan_usb(interface, udev, alt_max_pkt_size);
- if (rc < 0) {
- kfree(alt_max_pkt_size);
- return rc;
- }
- dev = kzalloc(sizeof(struct stk1160), GFP_KERNEL);
- if (dev == NULL) {
- kfree(alt_max_pkt_size);
- return -ENOMEM;
- }
- dev->alt_max_pkt_size = alt_max_pkt_size;
- dev->udev = udev;
- dev->num_alt = interface->num_altsetting;
- dev->ctl_input = input;
- /* We save struct device for debug purposes only */
- dev->dev = &interface->dev;
- usb_set_intfdata(interface, dev);
- /* initialize videobuf2 stuff */
- rc = stk1160_vb2_setup(dev);
- if (rc < 0)
- goto free_err;
- /*
- * There is no need to take any locks here in probe
- * because we register the device node as the *last* thing.
- */
- spin_lock_init(&dev->buf_lock);
- mutex_init(&dev->v4l_lock);
- mutex_init(&dev->vb_queue_lock);
- rc = v4l2_ctrl_handler_init(&dev->ctrl_handler, 0);
- if (rc) {
- stk1160_err("v4l2_ctrl_handler_init failed (%d)\n", rc);
- goto free_err;
- }
- /*
- * We obtain a v4l2_dev but defer
- * registration of video device node as the last thing.
- * There is no need to set the name if we give a device struct
- */
- dev->v4l2_dev.release = stk1160_release;
- dev->v4l2_dev.ctrl_handler = &dev->ctrl_handler;
- rc = v4l2_device_register(dev->dev, &dev->v4l2_dev);
- if (rc) {
- stk1160_err("v4l2_device_register failed (%d)\n", rc);
- goto free_ctrl;
- }
- rc = stk1160_i2c_register(dev);
- if (rc < 0)
- goto unreg_v4l2;
- /*
- * To the best of my knowledge stk1160 boards only have
- * saa7113, but it doesn't hurt to support them all.
- */
- dev->sd_saa7115 = v4l2_i2c_new_subdev(&dev->v4l2_dev, &dev->i2c_adap,
- "saa7115_auto", 0, saa7113_addrs);
- /* i2c reset saa711x */
- v4l2_device_call_all(&dev->v4l2_dev, 0, core, reset, 0);
- v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
- /* reset stk1160 to default values */
- stk1160_reg_reset(dev);
- /* select default input */
- stk1160_select_input(dev);
- stk1160_ac97_setup(dev);
- rc = stk1160_video_register(dev);
- if (rc < 0)
- goto unreg_i2c;
- return 0;
- unreg_i2c:
- stk1160_i2c_unregister(dev);
- unreg_v4l2:
- v4l2_device_unregister(&dev->v4l2_dev);
- free_ctrl:
- v4l2_ctrl_handler_free(&dev->ctrl_handler);
- free_err:
- kfree(alt_max_pkt_size);
- kfree(dev);
- return rc;
- }
- static void stk1160_disconnect(struct usb_interface *interface)
- {
- struct stk1160 *dev;
- dev = usb_get_intfdata(interface);
- usb_set_intfdata(interface, NULL);
- /*
- * Wait until all current v4l2 operation are finished
- * then deallocate resources
- */
- mutex_lock(&dev->vb_queue_lock);
- mutex_lock(&dev->v4l_lock);
- /* Here is the only place where isoc get released */
- stk1160_uninit_isoc(dev);
- stk1160_clear_queue(dev);
- video_unregister_device(&dev->vdev);
- v4l2_device_disconnect(&dev->v4l2_dev);
- /* This way current users can detect device is gone */
- dev->udev = NULL;
- mutex_unlock(&dev->v4l_lock);
- mutex_unlock(&dev->vb_queue_lock);
- /*
- * This calls stk1160_release if it's the last reference.
- * Otherwise, release is posponed until there are no users left.
- */
- v4l2_device_put(&dev->v4l2_dev);
- }
- static struct usb_driver stk1160_usb_driver = {
- .name = "stk1160",
- .id_table = stk1160_id_table,
- .probe = stk1160_probe,
- .disconnect = stk1160_disconnect,
- };
- module_usb_driver(stk1160_usb_driver);
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