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linux/drivers/media/usb/em28xx/em28xx-core.c
Markus Elfring ecbce48f1f media: em28xx: Fix exception handling in em28xx_alloc_urbs() 
A null pointer would be passed to a call of the function "kfree" directly
after a call of the function "kcalloc" failed at one place.
Pass the data structure member "urb" instead for which memory
was allocated before (so that this resource will be properly cleaned up).

This issue was detected by using the Coccinelle software.

Fixes: d571b592c6 ("media: em28xx: don't use coherent buffer for DMA transfers")
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
2019-08-29 10:22:20 -03:00

1184 lines
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// SPDX-License-Identifier: GPL-2.0+
//
// 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@kernel.org>
// Sascha Sommer <saschasommer@freenet.de>
// Copyright (C) 2012 Frank Schäfer <fschaefer.oss@googlemail.com>
//
// 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.
#include "em28xx.h"
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/vmalloc.h>
#include <sound/ac97_codec.h>
#include <media/v4l2-common.h>
#define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
"Markus Rechberger <mrechberger@gmail.com>, " \
"Mauro Carvalho Chehab <mchehab@kernel.org>, " \
"Sascha Sommer <saschasommer@freenet.de>"
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL v2");
MODULE_VERSION(EM28XX_VERSION);
/* #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 and isoc]");
#define em28xx_coredbg(fmt, arg...) do { \
if (core_debug) \
dev_printk(KERN_DEBUG, &dev->intf->dev, \
"core: %s: " fmt, __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) \
dev_printk(KERN_DEBUG, &dev->intf->dev, \
"reg: %s: " fmt, __func__, ## arg); \
} while (0)
/* FIXME: don't abuse core_debug */
#define em28xx_isocdbg(fmt, arg...) do { \
if (core_debug) \
dev_printk(KERN_DEBUG, &dev->intf->dev, \
"core: %s: " fmt, __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;
struct usb_device *udev = interface_to_usbdev(dev->intf);
int pipe = usb_rcvctrlpipe(udev, 0);
if (dev->disconnected)
return -ENODEV;
if (len > URB_MAX_CTRL_SIZE)
return -EINVAL;
mutex_lock(&dev->ctrl_urb_lock);
ret = usb_control_msg(udev, pipe, req,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0x0000, reg, dev->urb_buf, len, HZ);
if (ret < 0) {
em28xx_regdbg("(pipe 0x%08x): IN: %02x %02x %02x %02x %02x %02x %02x %02x failed with error %i\n",
pipe,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
req, 0, 0,
reg & 0xff, reg >> 8,
len & 0xff, len >> 8, ret);
mutex_unlock(&dev->ctrl_urb_lock);
return usb_translate_errors(ret);
}
if (len)
memcpy(buf, dev->urb_buf, len);
mutex_unlock(&dev->ctrl_urb_lock);
em28xx_regdbg("(pipe 0x%08x): IN: %02x %02x %02x %02x %02x %02x %02x %02x <<< %*ph\n",
pipe, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
req, 0, 0,
reg & 0xff, reg >> 8,
len & 0xff, len >> 8, len, buf);
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)
{
int ret;
u8 val;
ret = em28xx_read_reg_req_len(dev, req, reg, &val, 1);
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);
}
EXPORT_SYMBOL_GPL(em28xx_read_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;
struct usb_device *udev = interface_to_usbdev(dev->intf);
int pipe = usb_sndctrlpipe(udev, 0);
if (dev->disconnected)
return -ENODEV;
if (len < 1 || len > URB_MAX_CTRL_SIZE)
return -EINVAL;
mutex_lock(&dev->ctrl_urb_lock);
memcpy(dev->urb_buf, buf, len);
ret = usb_control_msg(udev, pipe, req,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0x0000, reg, dev->urb_buf, len, HZ);
mutex_unlock(&dev->ctrl_urb_lock);
if (ret < 0) {
em28xx_regdbg("(pipe 0x%08x): OUT: %02x %02x %02x %02x %02x %02x %02x %02x >>> %*ph failed with error %i\n",
pipe,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
req, 0, 0,
reg & 0xff, reg >> 8,
len & 0xff, len >> 8, len, buf, ret);
return usb_translate_errors(ret);
}
em28xx_regdbg("(pipe 0x%08x): OUT: %02x %02x %02x %02x %02x %02x %02x %02x >>> %*ph\n",
pipe,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
req, 0, 0,
reg & 0xff, reg >> 8,
len & 0xff, len >> 8, len, buf);
if (dev->wait_after_write)
msleep(dev->wait_after_write);
return ret;
}
int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
{
return em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
}
EXPORT_SYMBOL_GPL(em28xx_write_regs);
/* Write a single register */
int em28xx_write_reg(struct em28xx *dev, u16 reg, u8 val)
{
return em28xx_write_regs(dev, reg, &val, 1);
}
EXPORT_SYMBOL_GPL(em28xx_write_reg);
/*
* em28xx_write_reg_bits()
* sets only some bits (specified by bitmask) of a register, by first reading
* the actual value
*/
int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
u8 bitmask)
{
int oldval;
u8 newval;
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);
}
EXPORT_SYMBOL_GPL(em28xx_write_reg_bits);
/*
* em28xx_toggle_reg_bits()
* toggles/inverts the bits (specified by bitmask) of a register
*/
int em28xx_toggle_reg_bits(struct em28xx *dev, u16 reg, u8 bitmask)
{
int oldval;
u8 newval;
oldval = em28xx_read_reg(dev, reg);
if (oldval < 0)
return oldval;
newval = (~oldval & bitmask) | (oldval & ~bitmask);
return em28xx_write_reg(dev, reg, newval);
}
EXPORT_SYMBOL_GPL(em28xx_toggle_reg_bits);
/*
* em28xx_is_ac97_ready()
* Checks if ac97 is ready
*/
static int em28xx_is_ac97_ready(struct em28xx *dev)
{
unsigned long timeout = jiffies + msecs_to_jiffies(EM28XX_AC97_XFER_TIMEOUT);
int ret;
/* Wait up to 50 ms for AC97 command to complete */
while (time_is_after_jiffies(timeout)) {
ret = em28xx_read_reg(dev, EM28XX_R43_AC97BUSY);
if (ret < 0)
return ret;
if (!(ret & 0x01))
return 0;
msleep(5);
}
dev_warn(&dev->intf->dev,
"AC97 command still being executed: not handled properly!\n");
return -EBUSY;
}
/*
* em28xx_read_ac97()
* write a 16 bit value to the specified AC97 address (LSB first!)
*/
int em28xx_read_ac97(struct em28xx *dev, u8 reg)
{
int ret;
u8 addr = (reg & 0x7f) | 0x80;
__le16 val;
ret = em28xx_is_ac97_ready(dev);
if (ret < 0)
return ret;
ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
if (ret < 0)
return ret;
ret = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R40_AC97LSB,
(u8 *)&val, sizeof(val));
if (ret < 0)
return ret;
return le16_to_cpu(val);
}
EXPORT_SYMBOL_GPL(em28xx_read_ac97);
/*
* em28xx_write_ac97()
* write a 16 bit value to the specified AC97 address (LSB first!)
*/
int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val)
{
int ret;
u8 addr = reg & 0x7f;
__le16 value;
value = cpu_to_le16(val);
ret = em28xx_is_ac97_ready(dev);
if (ret < 0)
return ret;
ret = em28xx_write_regs(dev, EM28XX_R40_AC97LSB, (u8 *)&value, 2);
if (ret < 0)
return ret;
ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
if (ret < 0)
return ret;
return 0;
}
EXPORT_SYMBOL_GPL(em28xx_write_ac97);
struct em28xx_vol_itable {
enum em28xx_amux mux;
u8 reg;
};
static struct em28xx_vol_itable inputs[] = {
{ EM28XX_AMUX_VIDEO, AC97_VIDEO },
{ EM28XX_AMUX_LINE_IN, AC97_LINE },
{ EM28XX_AMUX_PHONE, AC97_PHONE },
{ EM28XX_AMUX_MIC, AC97_MIC },
{ EM28XX_AMUX_CD, AC97_CD },
{ EM28XX_AMUX_AUX, AC97_AUX },
{ EM28XX_AMUX_PCM_OUT, AC97_PCM },
};
static int set_ac97_input(struct em28xx *dev)
{
int ret, i;
enum em28xx_amux amux = dev->ctl_ainput;
/*
* EM28XX_AMUX_VIDEO2 is a special case used to indicate that
* em28xx should point to LINE IN, while AC97 should use VIDEO
*/
if (amux == EM28XX_AMUX_VIDEO2)
amux = EM28XX_AMUX_VIDEO;
/* Mute all entres but the one that were selected */
for (i = 0; i < ARRAY_SIZE(inputs); i++) {
if (amux == inputs[i].mux)
ret = em28xx_write_ac97(dev, inputs[i].reg, 0x0808);
else
ret = em28xx_write_ac97(dev, inputs[i].reg, 0x8000);
if (ret < 0)
dev_warn(&dev->intf->dev,
"couldn't setup AC97 register %d\n",
inputs[i].reg);
}
return 0;
}
static int em28xx_set_audio_source(struct em28xx *dev)
{
int ret;
u8 input;
if (dev->board.is_em2800) {
if (dev->ctl_ainput == EM28XX_AMUX_VIDEO)
input = EM2800_AUDIO_SRC_TUNER;
else
input = EM2800_AUDIO_SRC_LINE;
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;
default:
input = EM28XX_AUDIO_SRC_LINE;
break;
}
}
if (dev->board.mute_gpio && dev->mute)
em28xx_gpio_set(dev, dev->board.mute_gpio);
else
em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
ret = em28xx_write_reg_bits(dev, EM28XX_R0E_AUDIOSRC, input, 0xc0);
if (ret < 0)
return ret;
usleep_range(10000, 11000);
switch (dev->audio_mode.ac97) {
case EM28XX_NO_AC97:
break;
default:
ret = set_ac97_input(dev);
}
return ret;
}
struct em28xx_vol_otable {
enum em28xx_aout mux;
u8 reg;
};
static const struct em28xx_vol_otable outputs[] = {
{ EM28XX_AOUT_MASTER, AC97_MASTER },
{ EM28XX_AOUT_LINE, AC97_HEADPHONE },
{ EM28XX_AOUT_MONO, AC97_MASTER_MONO },
{ EM28XX_AOUT_LFE, AC97_CENTER_LFE_MASTER },
{ EM28XX_AOUT_SURR, AC97_SURROUND_MASTER },
};
int em28xx_audio_analog_set(struct em28xx *dev)
{
int ret, i;
u8 xclk;
if (dev->int_audio_type == EM28XX_INT_AUDIO_NONE)
return 0;
/*
* It is assumed that all devices use master volume for output.
* It would be possible to use also line output.
*/
if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
/* Mute all outputs */
for (i = 0; i < ARRAY_SIZE(outputs); i++) {
ret = em28xx_write_ac97(dev, outputs[i].reg, 0x8000);
if (ret < 0)
dev_warn(&dev->intf->dev,
"couldn't setup AC97 register %d\n",
outputs[i].reg);
}
}
xclk = dev->board.xclk & 0x7f;
if (!dev->mute)
xclk |= EM28XX_XCLK_AUDIO_UNMUTE;
ret = em28xx_write_reg(dev, EM28XX_R0F_XCLK, xclk);
if (ret < 0)
return ret;
usleep_range(10000, 11000);
/* Selects the proper audio input */
ret = em28xx_set_audio_source(dev);
/* Sets volume */
if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
int vol;
em28xx_write_ac97(dev, AC97_POWERDOWN, 0x4200);
em28xx_write_ac97(dev, AC97_EXTENDED_STATUS, 0x0031);
em28xx_write_ac97(dev, AC97_PCM_LR_ADC_RATE, 0xbb80);
/* LSB: left channel - both channels with the same level */
vol = (0x1f - dev->volume) | ((0x1f - dev->volume) << 8);
/* Mute device, if needed */
if (dev->mute)
vol |= 0x8000;
/* Sets volume */
for (i = 0; i < ARRAY_SIZE(outputs); i++) {
if (dev->ctl_aoutput & outputs[i].mux)
ret = em28xx_write_ac97(dev, outputs[i].reg,
vol);
if (ret < 0)
dev_warn(&dev->intf->dev,
"couldn't setup AC97 register %d\n",
outputs[i].reg);
}
if (dev->ctl_aoutput & EM28XX_AOUT_PCM_IN) {
int sel = ac97_return_record_select(dev->ctl_aoutput);
/*
* Use the same input for both left and right
* channels
*/
sel |= (sel << 8);
em28xx_write_ac97(dev, AC97_REC_SEL, sel);
}
}
return ret;
}
EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);
int em28xx_audio_setup(struct em28xx *dev)
{
int vid1, vid2, feat, cfg;
u32 vid = 0;
u8 i2s_samplerates;
if (dev->chip_id == CHIP_ID_EM2870 ||
dev->chip_id == CHIP_ID_EM2874 ||
dev->chip_id == CHIP_ID_EM28174 ||
dev->chip_id == CHIP_ID_EM28178) {
/* Digital only device - don't load any alsa module */
dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
return 0;
}
/* See how this device is configured */
cfg = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG);
dev_info(&dev->intf->dev, "Config register raw data: 0x%02x\n", cfg);
if (cfg < 0) { /* Register read error */
/* Be conservative */
dev->int_audio_type = EM28XX_INT_AUDIO_AC97;
} else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) == 0x00) {
/* The device doesn't have vendor audio at all */
dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
return 0;
} else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) != EM28XX_CHIPCFG_AC97) {
dev->int_audio_type = EM28XX_INT_AUDIO_I2S;
if (dev->chip_id < CHIP_ID_EM2860 &&
(cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
EM2820_CHIPCFG_I2S_1_SAMPRATE)
i2s_samplerates = 1;
else if (dev->chip_id >= CHIP_ID_EM2860 &&
(cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
EM2860_CHIPCFG_I2S_5_SAMPRATES)
i2s_samplerates = 5;
else
i2s_samplerates = 3;
dev_info(&dev->intf->dev, "I2S Audio (%d sample rate(s))\n",
i2s_samplerates);
/* Skip the code that does AC97 vendor detection */
dev->audio_mode.ac97 = EM28XX_NO_AC97;
goto init_audio;
} else {
dev->int_audio_type = EM28XX_INT_AUDIO_AC97;
}
dev->audio_mode.ac97 = EM28XX_AC97_OTHER;
vid1 = em28xx_read_ac97(dev, AC97_VENDOR_ID1);
if (vid1 < 0) {
/*
* Device likely doesn't support AC97
* Note: (some) em2800 devices without eeprom reports 0x91 on
* CHIPCFG register, even not having an AC97 chip
*/
dev_warn(&dev->intf->dev,
"AC97 chip type couldn't be determined\n");
dev->audio_mode.ac97 = EM28XX_NO_AC97;
if (dev->usb_audio_type == EM28XX_USB_AUDIO_VENDOR)
dev->usb_audio_type = EM28XX_USB_AUDIO_NONE;
dev->int_audio_type = EM28XX_INT_AUDIO_NONE;
goto init_audio;
}
vid2 = em28xx_read_ac97(dev, AC97_VENDOR_ID2);
if (vid2 < 0)
goto init_audio;
vid = vid1 << 16 | vid2;
dev_warn(&dev->intf->dev, "AC97 vendor ID = 0x%08x\n", vid);
feat = em28xx_read_ac97(dev, AC97_RESET);
if (feat < 0)
goto init_audio;
dev_warn(&dev->intf->dev, "AC97 features = 0x%04x\n", feat);
/* Try to identify what audio processor we have */
if ((vid == 0xffffffff || vid == 0x83847650) && feat == 0x6a90)
dev->audio_mode.ac97 = EM28XX_AC97_EM202;
else if ((vid >> 8) == 0x838476)
dev->audio_mode.ac97 = EM28XX_AC97_SIGMATEL;
init_audio:
/* Reports detected AC97 processor */
switch (dev->audio_mode.ac97) {
case EM28XX_NO_AC97:
dev_info(&dev->intf->dev, "No AC97 audio processor\n");
break;
case EM28XX_AC97_EM202:
dev_info(&dev->intf->dev,
"Empia 202 AC97 audio processor detected\n");
break;
case EM28XX_AC97_SIGMATEL:
dev_info(&dev->intf->dev,
"Sigmatel audio processor detected (stac 97%02x)\n",
vid & 0xff);
break;
case EM28XX_AC97_OTHER:
dev_warn(&dev->intf->dev,
"Unknown AC97 audio processor detected!\n");
break;
default:
break;
}
return em28xx_audio_analog_set(dev);
}
EXPORT_SYMBOL_GPL(em28xx_audio_setup);
const struct em28xx_led *em28xx_find_led(struct em28xx *dev,
enum em28xx_led_role role)
{
if (dev->board.leds) {
u8 k = 0;
while (dev->board.leds[k].role >= 0 &&
dev->board.leds[k].role < EM28XX_NUM_LED_ROLES) {
if (dev->board.leds[k].role == role)
return &dev->board.leds[k];
k++;
}
}
return NULL;
}
EXPORT_SYMBOL_GPL(em28xx_find_led);
int em28xx_capture_start(struct em28xx *dev, int start)
{
int rc;
const struct em28xx_led *led = NULL;
if (dev->chip_id == CHIP_ID_EM2874 ||
dev->chip_id == CHIP_ID_EM2884 ||
dev->chip_id == CHIP_ID_EM28174 ||
dev->chip_id == CHIP_ID_EM28178) {
/* The Transport Stream Enable Register moved in em2874 */
if (dev->dvb_xfer_bulk) {
/* Max Tx Size = 188 * 256 = 48128 - LCM(188,512) * 2 */
em28xx_write_reg(dev, (dev->ts == PRIMARY_TS) ?
EM2874_R5D_TS1_PKT_SIZE :
EM2874_R5E_TS2_PKT_SIZE,
0xff);
} else {
/* ISOC Maximum Transfer Size = 188 * 5 */
em28xx_write_reg(dev, (dev->ts == PRIMARY_TS) ?
EM2874_R5D_TS1_PKT_SIZE :
EM2874_R5E_TS2_PKT_SIZE,
dev->dvb_max_pkt_size_isoc / 188);
}
if (dev->ts == PRIMARY_TS)
rc = em28xx_write_reg_bits(dev,
EM2874_R5F_TS_ENABLE,
start ? EM2874_TS1_CAPTURE_ENABLE : 0x00,
EM2874_TS1_CAPTURE_ENABLE | EM2874_TS1_FILTER_ENABLE | EM2874_TS1_NULL_DISCARD);
else
rc = em28xx_write_reg_bits(dev,
EM2874_R5F_TS_ENABLE,
start ? EM2874_TS2_CAPTURE_ENABLE : 0x00,
EM2874_TS2_CAPTURE_ENABLE | EM2874_TS2_FILTER_ENABLE | EM2874_TS2_NULL_DISCARD);
} else {
/* 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) {
if (dev->is_webcam)
rc = em28xx_write_reg(dev, 0x13, 0x0c);
/* Enable video capture */
rc = em28xx_write_reg(dev, 0x48, 0x00);
if (rc < 0)
return rc;
if (dev->mode == EM28XX_ANALOG_MODE)
rc = em28xx_write_reg(dev,
EM28XX_R12_VINENABLE,
0x67);
else
rc = em28xx_write_reg(dev,
EM28XX_R12_VINENABLE,
0x37);
if (rc < 0)
return rc;
usleep_range(10000, 11000);
} else {
/* disable video capture */
rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x27);
}
}
if (dev->mode == EM28XX_ANALOG_MODE)
led = em28xx_find_led(dev, EM28XX_LED_ANALOG_CAPTURING);
else
led = em28xx_find_led(dev, EM28XX_LED_DIGITAL_CAPTURING);
if (led)
em28xx_write_reg_bits(dev, led->gpio_reg,
(!start ^ led->inverted) ?
~led->gpio_mask : led->gpio_mask,
led->gpio_mask);
return rc;
}
int em28xx_gpio_set(struct em28xx *dev, const struct em28xx_reg_seq *gpio)
{
int rc = 0;
if (!gpio)
return rc;
if (dev->mode != EM28XX_SUSPEND) {
em28xx_write_reg(dev, 0x48, 0x00);
if (dev->mode == EM28XX_ANALOG_MODE)
em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
else
em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
usleep_range(10000, 11000);
}
/* 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;
}
EXPORT_SYMBOL_GPL(em28xx_gpio_set);
int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode)
{
if (dev->mode == set_mode)
return 0;
if (set_mode == EM28XX_SUSPEND) {
dev->mode = set_mode;
/* FIXME: add suspend support for ac97 */
return em28xx_gpio_set(dev, dev->board.suspend_gpio);
}
dev->mode = set_mode;
if (dev->mode == EM28XX_DIGITAL_MODE)
return em28xx_gpio_set(dev, dev->board.dvb_gpio);
else
return em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
}
EXPORT_SYMBOL_GPL(em28xx_set_mode);
/*
*URB control
*/
/*
* URB completion handler for isoc/bulk transfers
*/
static void em28xx_irq_callback(struct urb *urb)
{
struct em28xx *dev = urb->context;
unsigned long flags;
int i;
switch (urb->status) {
case 0: /* success */
case -ETIMEDOUT: /* NAK */
break;
case -ECONNRESET: /* kill */
case -ENOENT:
case -ESHUTDOWN:
return;
default: /* error */
em28xx_isocdbg("urb completion error %d.\n", urb->status);
break;
}
/* Copy data from URB */
spin_lock_irqsave(&dev->slock, flags);
dev->usb_ctl.urb_data_copy(dev, urb);
spin_unlock_irqrestore(&dev->slock, flags);
/* Reset urb buffers */
for (i = 0; i < urb->number_of_packets; i++) {
/* isoc only (bulk: number_of_packets = 0) */
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_usb_xfer(struct em28xx *dev, enum em28xx_mode mode)
{
struct urb *urb;
struct em28xx_usb_bufs *usb_bufs;
int i;
em28xx_isocdbg("called %s in mode %d\n", __func__, mode);
if (mode == EM28XX_DIGITAL_MODE)
usb_bufs = &dev->usb_ctl.digital_bufs;
else
usb_bufs = &dev->usb_ctl.analog_bufs;
for (i = 0; i < usb_bufs->num_bufs; i++) {
urb = usb_bufs->urb[i];
if (urb) {
if (!irqs_disabled())
usb_kill_urb(urb);
else
usb_unlink_urb(urb);
usb_free_urb(urb);
usb_bufs->urb[i] = NULL;
}
}
kfree(usb_bufs->urb);
kfree(usb_bufs->buf);
usb_bufs->urb = NULL;
usb_bufs->buf = NULL;
usb_bufs->num_bufs = 0;
em28xx_capture_start(dev, 0);
}
EXPORT_SYMBOL_GPL(em28xx_uninit_usb_xfer);
/*
* Stop URBs
*/
void em28xx_stop_urbs(struct em28xx *dev)
{
int i;
struct urb *urb;
struct em28xx_usb_bufs *isoc_bufs = &dev->usb_ctl.digital_bufs;
em28xx_isocdbg("called %s\n", __func__);
for (i = 0; i < isoc_bufs->num_bufs; i++) {
urb = isoc_bufs->urb[i];
if (urb) {
if (!irqs_disabled())
usb_kill_urb(urb);
else
usb_unlink_urb(urb);
}
}
em28xx_capture_start(dev, 0);
}
EXPORT_SYMBOL_GPL(em28xx_stop_urbs);
/*
* Allocate URBs
*/
int em28xx_alloc_urbs(struct em28xx *dev, enum em28xx_mode mode, int xfer_bulk,
int num_bufs, int max_pkt_size, int packet_multiplier)
{
struct em28xx_usb_bufs *usb_bufs;
struct urb *urb;
struct usb_device *udev = interface_to_usbdev(dev->intf);
int i;
int sb_size, pipe;
int j, k;
em28xx_isocdbg("em28xx: called %s in mode %d\n", __func__, mode);
/*
* Check mode and if we have an endpoint for the selected
* transfer type, select buffer
*/
if (mode == EM28XX_DIGITAL_MODE) {
if ((xfer_bulk && !dev->dvb_ep_bulk) ||
(!xfer_bulk && !dev->dvb_ep_isoc)) {
dev_err(&dev->intf->dev,
"no endpoint for DVB mode and transfer type %d\n",
xfer_bulk > 0);
return -EINVAL;
}
usb_bufs = &dev->usb_ctl.digital_bufs;
} else if (mode == EM28XX_ANALOG_MODE) {
if ((xfer_bulk && !dev->analog_ep_bulk) ||
(!xfer_bulk && !dev->analog_ep_isoc)) {
dev_err(&dev->intf->dev,
"no endpoint for analog mode and transfer type %d\n",
xfer_bulk > 0);
return -EINVAL;
}
usb_bufs = &dev->usb_ctl.analog_bufs;
} else {
dev_err(&dev->intf->dev, "invalid mode selected\n");
return -EINVAL;
}
/* De-allocates all pending stuff */
em28xx_uninit_usb_xfer(dev, mode);
usb_bufs->num_bufs = num_bufs;
usb_bufs->urb = kcalloc(num_bufs, sizeof(void *), GFP_KERNEL);
if (!usb_bufs->urb)
return -ENOMEM;
usb_bufs->buf = kcalloc(num_bufs, sizeof(void *), GFP_KERNEL);
if (!usb_bufs->buf) {
kfree(usb_bufs->urb);
return -ENOMEM;
}
usb_bufs->max_pkt_size = max_pkt_size;
if (xfer_bulk)
usb_bufs->num_packets = 0;
else
usb_bufs->num_packets = packet_multiplier;
dev->usb_ctl.vid_buf = NULL;
dev->usb_ctl.vbi_buf = NULL;
sb_size = packet_multiplier * usb_bufs->max_pkt_size;
/* allocate urbs and transfer buffers */
for (i = 0; i < usb_bufs->num_bufs; i++) {
urb = usb_alloc_urb(usb_bufs->num_packets, GFP_KERNEL);
if (!urb) {
em28xx_uninit_usb_xfer(dev, mode);
return -ENOMEM;
}
usb_bufs->urb[i] = urb;
usb_bufs->buf[i] = kzalloc(sb_size, GFP_KERNEL);
if (!usb_bufs->buf[i]) {
em28xx_uninit_usb_xfer(dev, mode);
for (i--; i >= 0; i--)
kfree(usb_bufs->buf[i]);
kfree(usb_bufs->buf);
usb_bufs->buf = NULL;
return -ENOMEM;
}
urb->transfer_flags = URB_FREE_BUFFER;
if (xfer_bulk) { /* bulk */
pipe = usb_rcvbulkpipe(udev,
mode == EM28XX_ANALOG_MODE ?
dev->analog_ep_bulk :
dev->dvb_ep_bulk);
usb_fill_bulk_urb(urb, udev, pipe, usb_bufs->buf[i],
sb_size, em28xx_irq_callback, dev);
} else { /* isoc */
pipe = usb_rcvisocpipe(udev,
mode == EM28XX_ANALOG_MODE ?
dev->analog_ep_isoc :
dev->dvb_ep_isoc);
usb_fill_int_urb(urb, udev, pipe, usb_bufs->buf[i],
sb_size, em28xx_irq_callback, dev, 1);
urb->transfer_flags |= URB_ISO_ASAP;
k = 0;
for (j = 0; j < usb_bufs->num_packets; j++) {
urb->iso_frame_desc[j].offset = k;
urb->iso_frame_desc[j].length =
usb_bufs->max_pkt_size;
k += usb_bufs->max_pkt_size;
}
}
urb->number_of_packets = usb_bufs->num_packets;
}
return 0;
}
EXPORT_SYMBOL_GPL(em28xx_alloc_urbs);
/*
* Allocate URBs and start IRQ
*/
int em28xx_init_usb_xfer(struct em28xx *dev, enum em28xx_mode mode,
int xfer_bulk, int num_bufs, int max_pkt_size,
int packet_multiplier,
int (*urb_data_copy)(struct em28xx *dev, struct urb *urb))
{
struct em28xx_dmaqueue *dma_q = &dev->vidq;
struct em28xx_dmaqueue *vbi_dma_q = &dev->vbiq;
struct em28xx_usb_bufs *usb_bufs;
struct usb_device *udev = interface_to_usbdev(dev->intf);
int i;
int rc;
int alloc;
em28xx_isocdbg("em28xx: called %s in mode %d\n", __func__, mode);
dev->usb_ctl.urb_data_copy = urb_data_copy;
if (mode == EM28XX_DIGITAL_MODE) {
usb_bufs = &dev->usb_ctl.digital_bufs;
/* no need to free/alloc usb buffers in digital mode */
alloc = 0;
} else {
usb_bufs = &dev->usb_ctl.analog_bufs;
alloc = 1;
}
if (alloc) {
rc = em28xx_alloc_urbs(dev, mode, xfer_bulk, num_bufs,
max_pkt_size, packet_multiplier);
if (rc)
return rc;
}
if (xfer_bulk) {
rc = usb_clear_halt(udev, usb_bufs->urb[0]->pipe);
if (rc < 0) {
dev_err(&dev->intf->dev,
"failed to clear USB bulk endpoint stall/halt condition (error=%i)\n",
rc);
em28xx_uninit_usb_xfer(dev, mode);
return rc;
}
}
init_waitqueue_head(&dma_q->wq);
init_waitqueue_head(&vbi_dma_q->wq);
em28xx_capture_start(dev, 1);
/* submit urbs and enables IRQ */
for (i = 0; i < usb_bufs->num_bufs; i++) {
rc = usb_submit_urb(usb_bufs->urb[i], GFP_KERNEL);
if (rc) {
dev_err(&dev->intf->dev,
"submit of urb %i failed (error=%i)\n", i, rc);
em28xx_uninit_usb_xfer(dev, mode);
return rc;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(em28xx_init_usb_xfer);
/*
* Device control list
*/
static LIST_HEAD(em28xx_devlist);
static DEFINE_MUTEX(em28xx_devlist_mutex);
/*
* Extension interface
*/
static LIST_HEAD(em28xx_extension_devlist);
int em28xx_register_extension(struct em28xx_ops *ops)
{
struct em28xx *dev = NULL;
mutex_lock(&em28xx_devlist_mutex);
list_add_tail(&ops->next, &em28xx_extension_devlist);
list_for_each_entry(dev, &em28xx_devlist, devlist) {
if (ops->init) {
ops->init(dev);
if (dev->dev_next)
ops->init(dev->dev_next);
}
}
mutex_unlock(&em28xx_devlist_mutex);
pr_info("em28xx: Registered (%s) extension\n", ops->name);
return 0;
}
EXPORT_SYMBOL(em28xx_register_extension);
void em28xx_unregister_extension(struct em28xx_ops *ops)
{
struct em28xx *dev = NULL;
mutex_lock(&em28xx_devlist_mutex);
list_for_each_entry(dev, &em28xx_devlist, devlist) {
if (ops->fini) {
if (dev->dev_next)
ops->fini(dev->dev_next);
ops->fini(dev);
}
}
list_del(&ops->next);
mutex_unlock(&em28xx_devlist_mutex);
pr_info("em28xx: Removed (%s) extension\n", ops->name);
}
EXPORT_SYMBOL(em28xx_unregister_extension);
void em28xx_init_extension(struct em28xx *dev)
{
const struct em28xx_ops *ops = NULL;
mutex_lock(&em28xx_devlist_mutex);
list_add_tail(&dev->devlist, &em28xx_devlist);
list_for_each_entry(ops, &em28xx_extension_devlist, next) {
if (ops->init) {
ops->init(dev);
if (dev->dev_next)
ops->init(dev->dev_next);
}
}
mutex_unlock(&em28xx_devlist_mutex);
}
void em28xx_close_extension(struct em28xx *dev)
{
const struct em28xx_ops *ops = NULL;
mutex_lock(&em28xx_devlist_mutex);
list_for_each_entry(ops, &em28xx_extension_devlist, next) {
if (ops->fini) {
if (dev->dev_next)
ops->fini(dev->dev_next);
ops->fini(dev);
}
}
list_del(&dev->devlist);
mutex_unlock(&em28xx_devlist_mutex);
}
int em28xx_suspend_extension(struct em28xx *dev)
{
const struct em28xx_ops *ops = NULL;
dev_info(&dev->intf->dev, "Suspending extensions\n");
mutex_lock(&em28xx_devlist_mutex);
list_for_each_entry(ops, &em28xx_extension_devlist, next) {
if (ops->suspend)
ops->suspend(dev);
if (dev->dev_next)
ops->suspend(dev->dev_next);
}
mutex_unlock(&em28xx_devlist_mutex);
return 0;
}
int em28xx_resume_extension(struct em28xx *dev)
{
const struct em28xx_ops *ops = NULL;
dev_info(&dev->intf->dev, "Resuming extensions\n");
mutex_lock(&em28xx_devlist_mutex);
list_for_each_entry(ops, &em28xx_extension_devlist, next) {
if (!ops->resume)
continue;
ops->resume(dev);
if (dev->dev_next)
ops->resume(dev->dev_next);
}
mutex_unlock(&em28xx_devlist_mutex);
return 0;
}
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