446 lines
11 KiB
C
446 lines
11 KiB
C
/*
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* STK1160 driver
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*
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* Copyright (C) 2012 Ezequiel Garcia
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* <elezegarcia--a.t--gmail.com>
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*
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* Based on Easycap driver by R.M. Thomas
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* Copyright (C) 2010 R.M. Thomas
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* <rmthomas--a.t--sciolus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* TODO:
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*
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* 1. (Try to) detect if we must register ac97 mixer
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* 2. Support stream at lower speed: lower frame rate or lower frame size.
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <media/saa7115.h>
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#include "stk1160.h"
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#include "stk1160-reg.h"
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static unsigned int input;
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module_param(input, int, 0644);
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MODULE_PARM_DESC(input, "Set default input");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Ezequiel Garcia");
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MODULE_DESCRIPTION("STK1160 driver");
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/* Devices supported by this driver */
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static struct usb_device_id stk1160_id_table[] = {
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{ USB_DEVICE(0x05e1, 0x0408) },
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{ }
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};
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MODULE_DEVICE_TABLE(usb, stk1160_id_table);
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/* saa7113 I2C address */
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static unsigned short saa7113_addrs[] = {
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0x4a >> 1,
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I2C_CLIENT_END
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};
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/*
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* Read/Write stk registers
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*/
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int stk1160_read_reg(struct stk1160 *dev, u16 reg, u8 *value)
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{
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int ret;
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int pipe = usb_rcvctrlpipe(dev->udev, 0);
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u8 *buf;
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*value = 0;
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buf = kmalloc(sizeof(u8), GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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ret = usb_control_msg(dev->udev, pipe, 0x00,
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USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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0x00, reg, buf, sizeof(u8), HZ);
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if (ret < 0) {
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stk1160_err("read failed on reg 0x%x (%d)\n",
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reg, ret);
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kfree(buf);
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return ret;
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}
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*value = *buf;
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kfree(buf);
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return 0;
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}
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int stk1160_write_reg(struct stk1160 *dev, u16 reg, u16 value)
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{
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int ret;
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int pipe = usb_sndctrlpipe(dev->udev, 0);
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ret = usb_control_msg(dev->udev, pipe, 0x01,
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USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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value, reg, NULL, 0, HZ);
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if (ret < 0) {
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stk1160_err("write failed on reg 0x%x (%d)\n",
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reg, ret);
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return ret;
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}
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return 0;
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}
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void stk1160_select_input(struct stk1160 *dev)
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{
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int route;
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static const u8 gctrl[] = {
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0x98, 0x90, 0x88, 0x80, 0x98
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};
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if (dev->ctl_input == STK1160_SVIDEO_INPUT)
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route = SAA7115_SVIDEO3;
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else
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route = SAA7115_COMPOSITE0;
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if (dev->ctl_input < ARRAY_SIZE(gctrl)) {
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v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_routing,
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route, 0, 0);
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stk1160_write_reg(dev, STK1160_GCTRL, gctrl[dev->ctl_input]);
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}
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}
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/* TODO: We should break this into pieces */
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static void stk1160_reg_reset(struct stk1160 *dev)
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{
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int i;
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static const struct regval ctl[] = {
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{STK1160_GCTRL+2, 0x0078},
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{STK1160_RMCTL+1, 0x0000},
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{STK1160_RMCTL+3, 0x0002},
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{STK1160_PLLSO, 0x0010},
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{STK1160_PLLSO+1, 0x0000},
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{STK1160_PLLSO+2, 0x0014},
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{STK1160_PLLSO+3, 0x000E},
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{STK1160_PLLFD, 0x0046},
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/* Timing generator setup */
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{STK1160_TIGEN, 0x0012},
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{STK1160_TICTL, 0x002D},
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{STK1160_TICTL+1, 0x0001},
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{STK1160_TICTL+2, 0x0000},
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{STK1160_TICTL+3, 0x0000},
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{STK1160_TIGEN, 0x0080},
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{0xffff, 0xffff}
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};
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for (i = 0; ctl[i].reg != 0xffff; i++)
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stk1160_write_reg(dev, ctl[i].reg, ctl[i].val);
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}
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static void stk1160_release(struct v4l2_device *v4l2_dev)
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{
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struct stk1160 *dev = container_of(v4l2_dev, struct stk1160, v4l2_dev);
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stk1160_info("releasing all resources\n");
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stk1160_i2c_unregister(dev);
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v4l2_ctrl_handler_free(&dev->ctrl_handler);
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v4l2_device_unregister(&dev->v4l2_dev);
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kfree(dev->alt_max_pkt_size);
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kfree(dev);
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}
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/* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
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#define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
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/*
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* Scan usb interface and populate max_pkt_size array
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* with information on each alternate setting.
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* The array should be allocated by the caller.
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*/
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static int stk1160_scan_usb(struct usb_interface *intf, struct usb_device *udev,
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unsigned int *max_pkt_size)
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{
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int i, e, sizedescr, size, ifnum;
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const struct usb_endpoint_descriptor *desc;
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bool has_video = false, has_audio = false;
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const char *speed;
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ifnum = intf->altsetting[0].desc.bInterfaceNumber;
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/* Get endpoints */
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for (i = 0; i < intf->num_altsetting; i++) {
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for (e = 0; e < intf->altsetting[i].desc.bNumEndpoints; e++) {
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/* This isn't clear enough, at least to me */
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desc = &intf->altsetting[i].endpoint[e].desc;
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sizedescr = le16_to_cpu(desc->wMaxPacketSize);
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size = sizedescr & 0x7ff;
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if (udev->speed == USB_SPEED_HIGH)
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size = size * hb_mult(sizedescr);
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if (usb_endpoint_xfer_isoc(desc) &&
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usb_endpoint_dir_in(desc)) {
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switch (desc->bEndpointAddress) {
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case STK1160_EP_AUDIO:
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has_audio = true;
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break;
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case STK1160_EP_VIDEO:
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has_video = true;
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max_pkt_size[i] = size;
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break;
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}
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}
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}
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}
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/* Is this even possible? */
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if (!(has_audio || has_video)) {
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dev_err(&udev->dev, "no audio or video endpoints found\n");
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return -ENODEV;
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}
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switch (udev->speed) {
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case USB_SPEED_LOW:
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speed = "1.5";
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break;
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case USB_SPEED_FULL:
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speed = "12";
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break;
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case USB_SPEED_HIGH:
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speed = "480";
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break;
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default:
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speed = "unknown";
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}
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dev_info(&udev->dev, "New device %s %s @ %s Mbps (%04x:%04x, interface %d, class %d)\n",
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udev->manufacturer ? udev->manufacturer : "",
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udev->product ? udev->product : "",
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speed,
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le16_to_cpu(udev->descriptor.idVendor),
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le16_to_cpu(udev->descriptor.idProduct),
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ifnum,
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intf->altsetting->desc.bInterfaceNumber);
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/* This should never happen, since we rejected audio interfaces */
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if (has_audio)
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dev_warn(&udev->dev, "audio interface %d found.\n\
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This is not implemented by this driver,\
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you should use snd-usb-audio instead\n", ifnum);
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if (has_video)
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dev_info(&udev->dev, "video interface %d found\n",
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ifnum);
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/*
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* Make sure we have 480 Mbps of bandwidth, otherwise things like
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* video stream wouldn't likely work, since 12 Mbps is generally
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* not enough even for most streams.
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*/
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if (udev->speed != USB_SPEED_HIGH)
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dev_warn(&udev->dev, "must be connected to a high-speed USB 2.0 port\n\
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You may not be able to stream video smoothly\n");
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return 0;
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}
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static int stk1160_probe(struct usb_interface *interface,
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const struct usb_device_id *id)
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{
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int rc = 0;
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unsigned int *alt_max_pkt_size; /* array of wMaxPacketSize */
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struct usb_device *udev;
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struct stk1160 *dev;
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udev = interface_to_usbdev(interface);
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/*
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* Since usb audio class is supported by snd-usb-audio,
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* we reject audio interface.
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*/
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if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO)
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return -ENODEV;
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/* Alloc an array for all possible max_pkt_size */
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alt_max_pkt_size = kmalloc(sizeof(alt_max_pkt_size[0]) *
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interface->num_altsetting, GFP_KERNEL);
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if (alt_max_pkt_size == NULL)
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return -ENOMEM;
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/*
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* Scan usb posibilities and populate alt_max_pkt_size array.
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* Also, check if device speed is fast enough.
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*/
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rc = stk1160_scan_usb(interface, udev, alt_max_pkt_size);
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if (rc < 0) {
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kfree(alt_max_pkt_size);
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return rc;
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}
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dev = kzalloc(sizeof(struct stk1160), GFP_KERNEL);
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if (dev == NULL) {
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kfree(alt_max_pkt_size);
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return -ENOMEM;
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}
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dev->alt_max_pkt_size = alt_max_pkt_size;
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dev->udev = udev;
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dev->num_alt = interface->num_altsetting;
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dev->ctl_input = input;
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/* We save struct device for debug purposes only */
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dev->dev = &interface->dev;
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usb_set_intfdata(interface, dev);
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/* initialize videobuf2 stuff */
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rc = stk1160_vb2_setup(dev);
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if (rc < 0)
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goto free_err;
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/*
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* There is no need to take any locks here in probe
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* because we register the device node as the *last* thing.
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*/
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spin_lock_init(&dev->buf_lock);
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mutex_init(&dev->v4l_lock);
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mutex_init(&dev->vb_queue_lock);
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rc = v4l2_ctrl_handler_init(&dev->ctrl_handler, 0);
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if (rc) {
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stk1160_err("v4l2_ctrl_handler_init failed (%d)\n", rc);
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goto free_err;
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}
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/*
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* We obtain a v4l2_dev but defer
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* registration of video device node as the last thing.
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* There is no need to set the name if we give a device struct
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*/
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dev->v4l2_dev.release = stk1160_release;
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dev->v4l2_dev.ctrl_handler = &dev->ctrl_handler;
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rc = v4l2_device_register(dev->dev, &dev->v4l2_dev);
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if (rc) {
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stk1160_err("v4l2_device_register failed (%d)\n", rc);
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goto free_ctrl;
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}
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rc = stk1160_i2c_register(dev);
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if (rc < 0)
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goto unreg_v4l2;
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/*
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* To the best of my knowledge stk1160 boards only have
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* saa7113, but it doesn't hurt to support them all.
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*/
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dev->sd_saa7115 = v4l2_i2c_new_subdev(&dev->v4l2_dev, &dev->i2c_adap,
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"saa7115_auto", 0, saa7113_addrs);
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stk1160_info("driver ver %s successfully loaded\n",
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STK1160_VERSION);
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/* i2c reset saa711x */
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v4l2_device_call_all(&dev->v4l2_dev, 0, core, reset, 0);
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v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
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/* reset stk1160 to default values */
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stk1160_reg_reset(dev);
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/* select default input */
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stk1160_select_input(dev);
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stk1160_ac97_register(dev);
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rc = stk1160_video_register(dev);
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if (rc < 0)
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goto unreg_i2c;
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return 0;
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unreg_i2c:
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stk1160_i2c_unregister(dev);
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unreg_v4l2:
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v4l2_device_unregister(&dev->v4l2_dev);
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free_ctrl:
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v4l2_ctrl_handler_free(&dev->ctrl_handler);
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free_err:
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kfree(alt_max_pkt_size);
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kfree(dev);
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return rc;
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}
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static void stk1160_disconnect(struct usb_interface *interface)
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{
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struct stk1160 *dev;
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dev = usb_get_intfdata(interface);
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usb_set_intfdata(interface, NULL);
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/*
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* Wait until all current v4l2 operation are finished
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* then deallocate resources
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*/
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mutex_lock(&dev->vb_queue_lock);
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mutex_lock(&dev->v4l_lock);
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/* Here is the only place where isoc get released */
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stk1160_uninit_isoc(dev);
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/* ac97 unregister needs to be done before usb_device is cleared */
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stk1160_ac97_unregister(dev);
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stk1160_clear_queue(dev);
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video_unregister_device(&dev->vdev);
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v4l2_device_disconnect(&dev->v4l2_dev);
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/* This way current users can detect device is gone */
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dev->udev = NULL;
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mutex_unlock(&dev->v4l_lock);
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mutex_unlock(&dev->vb_queue_lock);
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/*
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* This calls stk1160_release if it's the last reference.
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* therwise, release is posponed until there are no users left.
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*/
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v4l2_device_put(&dev->v4l2_dev);
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}
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static struct usb_driver stk1160_usb_driver = {
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.name = "stk1160",
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.id_table = stk1160_id_table,
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.probe = stk1160_probe,
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.disconnect = stk1160_disconnect,
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};
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module_usb_driver(stk1160_usb_driver);
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