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OpenCloudOS-Kernel/drivers/media/video/em28xx/em28xx-core.c

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/*
em28xx-core.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
Markus Rechberger <mrechberger@gmail.com>
Mauro Carvalho Chehab <mchehab@infradead.org>
Sascha Sommer <saschasommer@freenet.de>
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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/vmalloc.h>
#include "em28xx.h"
/* #define ENABLE_DEBUG_ISOC_FRAMES */
static unsigned int core_debug;
module_param(core_debug,int,0644);
MODULE_PARM_DESC(core_debug,"enable debug messages [core]");
#define em28xx_coredbg(fmt, arg...) do {\
if (core_debug) \
printk(KERN_INFO "%s %s :"fmt, \
dev->name, __func__ , ##arg); } while (0)
static unsigned int reg_debug;
module_param(reg_debug,int,0644);
MODULE_PARM_DESC(reg_debug,"enable debug messages [URB reg]");
#define em28xx_regdbg(fmt, arg...) do {\
if (reg_debug) \
printk(KERN_INFO "%s %s :"fmt, \
dev->name, __func__ , ##arg); } while (0)
static int alt = EM28XX_PINOUT;
module_param(alt, int, 0644);
MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
/* FIXME */
#define em28xx_isocdbg(fmt, arg...) do {\
if (core_debug) \
printk(KERN_INFO "%s %s :"fmt, \
dev->name, __func__ , ##arg); } while (0)
/*
* em28xx_read_reg_req()
* reads data from the usb device specifying bRequest
*/
int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
char *buf, int len)
{
int ret, byte;
if (dev->state & DEV_DISCONNECTED)
return(-ENODEV);
em28xx_regdbg("req=%02x, reg=%02x ", req, reg);
ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0x0000, reg, buf, len, HZ);
if (reg_debug) {
printk(ret < 0 ? " failed!\n" : "%02x values: ", ret);
for (byte = 0; byte < len; byte++)
printk(" %02x", (unsigned char)buf[byte]);
printk("\n");
}
return ret;
}
/*
* em28xx_read_reg_req()
* reads data from the usb device specifying bRequest
*/
int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
{
u8 val;
int ret;
if (dev->state & DEV_DISCONNECTED)
return(-ENODEV);
em28xx_regdbg("req=%02x, reg=%02x:", req, reg);
ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0x0000, reg, &val, 1, HZ);
if (reg_debug)
printk(ret < 0 ? " failed!\n" :
"%02x\n", (unsigned char) val);
if (ret < 0)
return ret;
return val;
}
int em28xx_read_reg(struct em28xx *dev, u16 reg)
{
return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
}
/*
* em28xx_write_regs_req()
* sends data to the usb device, specifying bRequest
*/
int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
int len)
{
int ret;
/*usb_control_msg seems to expect a kmalloced buffer */
unsigned char *bufs;
if (dev->state & DEV_DISCONNECTED)
return -ENODEV;
if (len < 1)
return -EINVAL;
bufs = kmalloc(len, GFP_KERNEL);
em28xx_regdbg("req=%02x reg=%02x:", req, reg);
if (reg_debug) {
int i;
for (i = 0; i < len; ++i)
printk(" %02x", (unsigned char)buf[i]);
printk("\n");
}
if (!bufs)
return -ENOMEM;
memcpy(bufs, buf, len);
ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), req,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0x0000, reg, bufs, len, HZ);
if (dev->wait_after_write)
msleep(dev->wait_after_write);
kfree(bufs);
return ret;
}
int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
{
int rc;
rc = em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
/* Stores GPO/GPIO values at the cache, if changed
Only write values should be stored, since input on a GPIO
register will return the input bits.
Not sure what happens on reading GPO register.
*/
if (rc >= 0) {
if (reg == EM2880_R04_GPO)
dev->reg_gpo = buf[0];
else if (reg == EM28XX_R08_GPIO)
dev->reg_gpio = buf[0];
}
return rc;
}
/*
* em28xx_write_reg_bits()
* sets only some bits (specified by bitmask) of a register, by first reading
* the actual value
*/
static int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
u8 bitmask)
{
int oldval;
u8 newval;
/* Uses cache for gpo/gpio registers */
if (reg == EM2880_R04_GPO)
oldval = dev->reg_gpo;
else if (reg == EM28XX_R08_GPIO)
oldval = dev->reg_gpio;
else
oldval = em28xx_read_reg(dev, reg);
if (oldval < 0)
return oldval;
newval = (((u8) oldval) & ~bitmask) | (val & bitmask);
return em28xx_write_regs(dev, reg, &newval, 1);
}
/*
* em28xx_write_ac97()
* write a 16 bit value to the specified AC97 address (LSB first!)
*/
static int em28xx_write_ac97(struct em28xx *dev, u8 reg, u8 *val)
{
int ret, i;
u8 addr = reg & 0x7f;
ret = em28xx_write_regs(dev, EM28XX_R40_AC97LSB, val, 2);
if (ret < 0)
return ret;
ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
if (ret < 0)
return ret;
/* Wait up to 50 ms for AC97 command to complete */
for (i = 0; i < 10; i++) {
ret = em28xx_read_reg(dev, EM28XX_R43_AC97BUSY);
if (ret < 0)
return ret;
if (!(ret & 0x01))
return 0;
msleep(5);
}
em28xx_warn("AC97 command still being executed: not handled properly!\n");
return 0;
}
static int em28xx_set_audio_source(struct em28xx *dev)
{
static char *enable = "\x08\x08";
static char *disable = "\x08\x88";
char *video = enable, *line = disable;
int ret;
u8 input;
if (dev->is_em2800) {
if (dev->ctl_ainput)
input = EM2800_AUDIO_SRC_LINE;
else
input = EM2800_AUDIO_SRC_TUNER;
ret = em28xx_write_regs(dev, EM2800_R08_AUDIOSRC, &input, 1);
if (ret < 0)
return ret;
}
if (dev->has_msp34xx)
input = EM28XX_AUDIO_SRC_TUNER;
else {
switch (dev->ctl_ainput) {
case EM28XX_AMUX_VIDEO:
input = EM28XX_AUDIO_SRC_TUNER;
break;
case EM28XX_AMUX_LINE_IN:
input = EM28XX_AUDIO_SRC_LINE;
break;
case EM28XX_AMUX_AC97_VIDEO:
input = EM28XX_AUDIO_SRC_LINE;
break;
case EM28XX_AMUX_AC97_LINE_IN:
input = EM28XX_AUDIO_SRC_LINE;
video = disable;
line = enable;
break;
}
}
ret = em28xx_write_reg_bits(dev, EM28XX_R0E_AUDIOSRC, input, 0xc0);
if (ret < 0)
return ret;
msleep(5);
/* Sets AC97 mixer registers
This is seems to be needed, even for non-ac97 configs
*/
ret = em28xx_write_ac97(dev, EM28XX_R14_VIDEO_AC97, video);
if (ret < 0)
return ret;
ret = em28xx_write_ac97(dev, EM28XX_R10_LINE_IN_AC97, line);
return ret;
}
int em28xx_audio_analog_set(struct em28xx *dev)
{
int ret;
char s[2] = { 0x00, 0x00 };
u8 xclk = 0x07;
s[0] |= 0x1f - dev->volume;
s[1] |= 0x1f - dev->volume;
/* Mute */
s[1] |= 0x80;
ret = em28xx_write_ac97(dev, EM28XX_R02_MASTER_AC97, s);
if (ret < 0)
return ret;
if (dev->has_12mhz_i2s)
xclk |= 0x20;
if (!dev->mute)
xclk |= 0x80;
ret = em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, xclk, 0xa7);
if (ret < 0)
return ret;
msleep(10);
/* Selects the proper audio input */
ret = em28xx_set_audio_source(dev);
/* Unmute device */
if (!dev->mute)
s[1] &= ~0x80;
ret = em28xx_write_ac97(dev, EM28XX_R02_MASTER_AC97, s);
return ret;
}
EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);
int em28xx_colorlevels_set_default(struct em28xx *dev)
{
em28xx_write_regs(dev, EM28XX_R20_YGAIN, "\x10", 1); /* contrast */
em28xx_write_regs(dev, EM28XX_R21_YOFFSET, "\x00", 1); /* brightness */
em28xx_write_regs(dev, EM28XX_R22_UVGAIN, "\x10", 1); /* saturation */
em28xx_write_regs(dev, EM28XX_R23_UOFFSET, "\x00", 1);
em28xx_write_regs(dev, EM28XX_R24_VOFFSET, "\x00", 1);
em28xx_write_regs(dev, EM28XX_R25_SHARPNESS, "\x00", 1);
em28xx_write_regs(dev, EM28XX_R14_GAMMA, "\x20", 1);
em28xx_write_regs(dev, EM28XX_R15_RGAIN, "\x20", 1);
em28xx_write_regs(dev, EM28XX_R16_GGAIN, "\x20", 1);
em28xx_write_regs(dev, EM28XX_R17_BGAIN, "\x20", 1);
em28xx_write_regs(dev, EM28XX_R18_ROFFSET, "\x00", 1);
em28xx_write_regs(dev, EM28XX_R19_GOFFSET, "\x00", 1);
return em28xx_write_regs(dev, EM28XX_R1A_BOFFSET, "\x00", 1);
}
int em28xx_capture_start(struct em28xx *dev, int start)
{
int rc;
/* FIXME: which is the best order? */
/* video registers are sampled by VREF */
rc = em28xx_write_reg_bits(dev, EM28XX_R0C_USBSUSP,
start ? 0x10 : 0x00, 0x10);
if (rc < 0)
return rc;
if (!start) {
/* disable video capture */
rc = em28xx_write_regs(dev, EM28XX_R12_VINENABLE, "\x27", 1);
return rc;
}
/* enable video capture */
rc = em28xx_write_regs_req(dev, 0x00, 0x48, "\x00", 1);
if (dev->mode == EM28XX_ANALOG_MODE)
rc = em28xx_write_regs(dev, EM28XX_R12_VINENABLE, "\x67", 1);
else
rc = em28xx_write_regs(dev, EM28XX_R12_VINENABLE, "\x37", 1);
msleep(6);
return rc;
}
int em28xx_outfmt_set_yuv422(struct em28xx *dev)
{
em28xx_write_regs(dev, EM28XX_R27_OUTFMT, "\x34", 1);
em28xx_write_regs(dev, EM28XX_R10_VINMODE, "\x10", 1);
return em28xx_write_regs(dev, EM28XX_R11_VINCTRL, "\x11", 1);
}
static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
u8 ymin, u8 ymax)
{
em28xx_coredbg("em28xx Scale: (%d,%d)-(%d,%d)\n",
xmin, ymin, xmax, ymax);
em28xx_write_regs(dev, EM28XX_R28_XMIN, &xmin, 1);
em28xx_write_regs(dev, EM28XX_R29_XMAX, &xmax, 1);
em28xx_write_regs(dev, EM28XX_R2A_YMIN, &ymin, 1);
return em28xx_write_regs(dev, EM28XX_R2B_YMAX, &ymax, 1);
}
static int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
u16 width, u16 height)
{
u8 cwidth = width;
u8 cheight = height;
u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);
em28xx_coredbg("em28xx Area Set: (%d,%d)\n",
(width | (overflow & 2) << 7),
(height | (overflow & 1) << 8));
em28xx_write_regs(dev, EM28XX_R1C_HSTART, &hstart, 1);
em28xx_write_regs(dev, EM28XX_R1D_VSTART, &vstart, 1);
em28xx_write_regs(dev, EM28XX_R1E_CWIDTH, &cwidth, 1);
em28xx_write_regs(dev, EM28XX_R1F_CHEIGHT, &cheight, 1);
return em28xx_write_regs(dev, EM28XX_R1B_OFLOW, &overflow, 1);
}
static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
{
u8 mode;
/* the em2800 scaler only supports scaling down to 50% */
if (dev->is_em2800)
mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
else {
u8 buf[2];
buf[0] = h;
buf[1] = h >> 8;
em28xx_write_regs(dev, EM28XX_R30_HSCALELOW, (char *)buf, 2);
buf[0] = v;
buf[1] = v >> 8;
em28xx_write_regs(dev, EM28XX_R32_VSCALELOW, (char *)buf, 2);
/* it seems that both H and V scalers must be active
to work correctly */
mode = (h || v)? 0x30: 0x00;
}
return em28xx_write_reg_bits(dev, EM28XX_R26_COMPR, mode, 0x30);
}
/* FIXME: this only function read values from dev */
int em28xx_resolution_set(struct em28xx *dev)
{
int width, height;
width = norm_maxw(dev);
height = norm_maxh(dev) >> 1;
em28xx_outfmt_set_yuv422(dev);
em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
}
int em28xx_set_alternate(struct em28xx *dev)
{
int errCode, prev_alt = dev->alt;
int i;
unsigned int min_pkt_size = dev->width * 2 + 4;
/* When image size is bigger than a certain value,
the frame size should be increased, otherwise, only
green screen will be received.
*/
if (dev->width * 2 * dev->height > 720 * 240 * 2)
min_pkt_size *= 2;
for (i = 0; i < dev->num_alt; i++) {
/* stop when the selected alt setting offers enough bandwidth */
if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
dev->alt = i;
break;
/* otherwise make sure that we end up with the maximum bandwidth
because the min_pkt_size equation might be wrong...
*/
} else if (dev->alt_max_pkt_size[i] >
dev->alt_max_pkt_size[dev->alt])
dev->alt = i;
}
if (dev->alt != prev_alt) {
em28xx_coredbg("minimum isoc packet size: %u (alt=%d)\n",
min_pkt_size, dev->alt);
dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
em28xx_coredbg("setting alternate %d with wMaxPacketSize=%u\n",
dev->alt, dev->max_pkt_size);
errCode = usb_set_interface(dev->udev, 0, dev->alt);
if (errCode < 0) {
em28xx_errdev("cannot change alternate number to %d (error=%i)\n",
dev->alt, errCode);
return errCode;
}
}
return 0;
}
int em28xx_gpio_set(struct em28xx *dev, struct em28xx_reg_seq *gpio)
{
int rc = 0;
if (!gpio)
return rc;
dev->em28xx_write_regs_req(dev, 0x00, 0x48, "\x00", 1);
if (dev->mode == EM28XX_ANALOG_MODE)
dev->em28xx_write_regs_req(dev, 0x00, 0x12, "\x67", 1);
else
dev->em28xx_write_regs_req(dev, 0x00, 0x12, "\x37", 1);
msleep(6);
/* Send GPIO reset sequences specified at board entry */
while (gpio->sleep >= 0) {
if (gpio->reg >= 0) {
rc = em28xx_write_reg_bits(dev,
gpio->reg,
gpio->val,
gpio->mask);
if (rc < 0)
return rc;
}
if (gpio->sleep > 0)
msleep(gpio->sleep);
gpio++;
}
return rc;
}
int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode)
{
if (dev->mode == set_mode)
return 0;
if (set_mode == EM28XX_MODE_UNDEFINED) {
dev->mode = set_mode;
return 0;
}
dev->mode = set_mode;
if (dev->mode == EM28XX_DIGITAL_MODE)
return em28xx_gpio_set(dev, dev->digital_gpio);
else
return em28xx_gpio_set(dev, dev->analog_gpio);
}
EXPORT_SYMBOL_GPL(em28xx_set_mode);
/* ------------------------------------------------------------------
URB control
------------------------------------------------------------------*/
/*
* IRQ callback, called by URB callback
*/
static void em28xx_irq_callback(struct urb *urb)
{
struct em28xx_dmaqueue *dma_q = urb->context;
struct em28xx *dev = container_of(dma_q, struct em28xx, vidq);
int rc, i;
/* Copy data from URB */
spin_lock(&dev->slock);
rc = dev->isoc_ctl.isoc_copy(dev, urb);
spin_unlock(&dev->slock);
/* Reset urb buffers */
for (i = 0; i < urb->number_of_packets; i++) {
urb->iso_frame_desc[i].status = 0;
urb->iso_frame_desc[i].actual_length = 0;
}
urb->status = 0;
urb->status = usb_submit_urb(urb, GFP_ATOMIC);
if (urb->status) {
em28xx_isocdbg("urb resubmit failed (error=%i)\n",
urb->status);
}
}
/*
* Stop and Deallocate URBs
*/
void em28xx_uninit_isoc(struct em28xx *dev)
{
struct urb *urb;
int i;
em28xx_isocdbg("em28xx: called em28xx_uninit_isoc\n");
dev->isoc_ctl.nfields = -1;
for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
urb = dev->isoc_ctl.urb[i];
if (urb) {
usb_kill_urb(urb);
usb_unlink_urb(urb);
if (dev->isoc_ctl.transfer_buffer[i]) {
usb_buffer_free(dev->udev,
urb->transfer_buffer_length,
dev->isoc_ctl.transfer_buffer[i],
urb->transfer_dma);
}
usb_free_urb(urb);
dev->isoc_ctl.urb[i] = NULL;
}
dev->isoc_ctl.transfer_buffer[i] = NULL;
}
kfree(dev->isoc_ctl.urb);
kfree(dev->isoc_ctl.transfer_buffer);
dev->isoc_ctl.urb = NULL;
dev->isoc_ctl.transfer_buffer = NULL;
dev->isoc_ctl.num_bufs = 0;
em28xx_capture_start(dev, 0);
}
EXPORT_SYMBOL_GPL(em28xx_uninit_isoc);
/*
* Allocate URBs and start IRQ
*/
int em28xx_init_isoc(struct em28xx *dev, int max_packets,
int num_bufs, int max_pkt_size,
int (*isoc_copy) (struct em28xx *dev, struct urb *urb))
{
struct em28xx_dmaqueue *dma_q = &dev->vidq;
int i;
int sb_size, pipe;
struct urb *urb;
int j, k;
int rc;
em28xx_isocdbg("em28xx: called em28xx_prepare_isoc\n");
/* De-allocates all pending stuff */
em28xx_uninit_isoc(dev);
dev->isoc_ctl.isoc_copy = isoc_copy;
dev->isoc_ctl.num_bufs = num_bufs;
dev->isoc_ctl.urb = kzalloc(sizeof(void *)*num_bufs, GFP_KERNEL);
if (!dev->isoc_ctl.urb) {
em28xx_errdev("cannot alloc memory for usb buffers\n");
return -ENOMEM;
}
dev->isoc_ctl.transfer_buffer = kzalloc(sizeof(void *)*num_bufs,
GFP_KERNEL);
if (!dev->isoc_ctl.transfer_buffer) {
em28xx_errdev("cannot allocate memory for usbtransfer\n");
kfree(dev->isoc_ctl.urb);
return -ENOMEM;
}
dev->isoc_ctl.max_pkt_size = max_pkt_size;
dev->isoc_ctl.buf = NULL;
sb_size = max_packets * dev->isoc_ctl.max_pkt_size;
/* allocate urbs and transfer buffers */
for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
urb = usb_alloc_urb(max_packets, GFP_KERNEL);
if (!urb) {
em28xx_err("cannot alloc isoc_ctl.urb %i\n", i);
em28xx_uninit_isoc(dev);
return -ENOMEM;
}
dev->isoc_ctl.urb[i] = urb;
dev->isoc_ctl.transfer_buffer[i] = usb_buffer_alloc(dev->udev,
sb_size, GFP_KERNEL, &urb->transfer_dma);
if (!dev->isoc_ctl.transfer_buffer[i]) {
em28xx_err("unable to allocate %i bytes for transfer"
" buffer %i%s\n",
sb_size, i,
in_interrupt()?" while in int":"");
em28xx_uninit_isoc(dev);
return -ENOMEM;
}
memset(dev->isoc_ctl.transfer_buffer[i], 0, sb_size);
/* FIXME: this is a hack - should be
'desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK'
should also be using 'desc.bInterval'
*/
pipe = usb_rcvisocpipe(dev->udev,
dev->mode == EM28XX_ANALOG_MODE ? 0x82 : 0x84);
usb_fill_int_urb(urb, dev->udev, pipe,
dev->isoc_ctl.transfer_buffer[i], sb_size,
em28xx_irq_callback, dma_q, 1);
urb->number_of_packets = max_packets;
urb->transfer_flags = URB_ISO_ASAP;
k = 0;
for (j = 0; j < max_packets; j++) {
urb->iso_frame_desc[j].offset = k;
urb->iso_frame_desc[j].length =
dev->isoc_ctl.max_pkt_size;
k += dev->isoc_ctl.max_pkt_size;
}
}
init_waitqueue_head(&dma_q->wq);
em28xx_capture_start(dev, 1);
/* submit urbs and enables IRQ */
for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_ATOMIC);
if (rc) {
em28xx_err("submit of urb %i failed (error=%i)\n", i,
rc);
em28xx_uninit_isoc(dev);
return rc;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(em28xx_init_isoc);
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