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linux-next/drivers/media/usb/em28xx/em28xx-core.c
Shuah Khan 9c669b7314 [media] em28xx: add suspend/resume to em28xx_ops 
em28xx usb driver will have to suspend and resume its extensions. Adding
suspend and resume to em28xx_ops gives extensions the ability to install
suspend and resume that can be invoked from em28xx_usb driver suspend()
and resume() interfaces.

Approach:
Add power management support to em28xx usb driver. This driver works in
conjunction with extensions for each of the functions on the USB device
for video/audio/dvb/remote functionality that is present on media USB
devices it supports. During suspend and resume each of these extensions
will have to do their part in suspending the components they control.

Adding suspend and resume hooks to the existing struct em28xx_ops will
enable the extensions the ability to implement suspend and resume hooks
to be called from em28xx driver. The overall approach is as follows:

-- add suspend and resume hooks to em28xx_ops
-- add suspend and resume routines to em28xx-core to invoke suspend
   and resume hooks for all registered extensions.
-- change em28xx dvb, audio, input, and video extensions to implement
   em28xx_ops: suspend and resume hooks. These hooks do what is necessary
   to suspend and resume the devices they control.

Signed-off-by: Shuah Khan <shuah.kh@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
2014-03-03 06:45:57 -03:00

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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>
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.
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/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>
#include "em28xx.h"
#define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
"Markus Rechberger <mrechberger@gmail.com>, " \
"Mauro Carvalho Chehab <mchehab@infradead.org>, " \
"Sascha Sommer <saschasommer@freenet.de>"
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
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]");
#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)
/* 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;
int pipe = usb_rcvctrlpipe(dev->udev, 0);
if (dev->disconnected)
return -ENODEV;
if (len > URB_MAX_CTRL_SIZE)
return -EINVAL;
if (reg_debug) {
printk(KERN_DEBUG "(pipe 0x%08x): "
"IN: %02x %02x %02x %02x %02x %02x %02x %02x ",
pipe,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
req, 0, 0,
reg & 0xff, reg >> 8,
len & 0xff, len >> 8);
}
mutex_lock(&dev->ctrl_urb_lock);
ret = usb_control_msg(dev->udev, pipe, req,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0x0000, reg, dev->urb_buf, len, HZ);
if (ret < 0) {
if (reg_debug)
printk(" failed!\n");
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);
if (reg_debug) {
int byte;
printk("<<<");
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)
{
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;
int pipe = usb_sndctrlpipe(dev->udev, 0);
if (dev->disconnected)
return -ENODEV;
if ((len < 1) || (len > URB_MAX_CTRL_SIZE))
return -EINVAL;
if (reg_debug) {
int byte;
printk(KERN_DEBUG "(pipe 0x%08x): "
"OUT: %02x %02x %02x %02x %02x %02x %02x %02x >>>",
pipe,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
req, 0, 0,
reg & 0xff, reg >> 8,
len & 0xff, len >> 8);
for (byte = 0; byte < len; byte++)
printk(" %02x", (unsigned char)buf[byte]);
printk("\n");
}
mutex_lock(&dev->ctrl_urb_lock);
memcpy(dev->urb_buf, buf, len);
ret = usb_control_msg(dev->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)
return usb_translate_errors(ret);
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);
}
em28xx_warn("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;
u16 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)
em28xx_warn("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->board.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;
msleep(5);
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->audio_mode.has_audio)
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)
em28xx_warn("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;
msleep(10);
/* 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)
em28xx_warn("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;
if (!dev->audio_mode.has_audio)
return 0;
/* See how this device is configured */
cfg = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG);
em28xx_info("Config register raw data: 0x%02x\n", cfg);
if (cfg < 0) {
/* Register read error? */
cfg = EM28XX_CHIPCFG_AC97; /* Be conservative */
} else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) == 0x00) {
/* The device doesn't have vendor audio at all */
dev->has_alsa_audio = false;
dev->audio_mode.has_audio = false;
return 0;
} else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) != EM28XX_CHIPCFG_AC97) {
if (dev->chip_id < CHIP_ID_EM2860 &&
(cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
EM2820_CHIPCFG_I2S_1_SAMPRATE)
dev->audio_mode.i2s_samplerates = 1;
else if (dev->chip_id >= CHIP_ID_EM2860 &&
(cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
EM2860_CHIPCFG_I2S_5_SAMPRATES)
dev->audio_mode.i2s_samplerates = 5;
else
dev->audio_mode.i2s_samplerates = 3;
em28xx_info("I2S Audio (%d sample rate(s))\n",
dev->audio_mode.i2s_samplerates);
/* Skip the code that does AC97 vendor detection */
dev->audio_mode.ac97 = EM28XX_NO_AC97;
goto init_audio;
}
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
*/
em28xx_warn("AC97 chip type couldn't be determined\n");
dev->audio_mode.ac97 = EM28XX_NO_AC97;
dev->has_alsa_audio = false;
dev->audio_mode.has_audio = false;
goto init_audio;
}
vid2 = em28xx_read_ac97(dev, AC97_VENDOR_ID2);
if (vid2 < 0)
goto init_audio;
vid = vid1 << 16 | vid2;
dev->audio_mode.ac97_vendor_id = vid;
em28xx_warn("AC97 vendor ID = 0x%08x\n", vid);
feat = em28xx_read_ac97(dev, AC97_RESET);
if (feat < 0)
goto init_audio;
dev->audio_mode.ac97_feat = feat;
em28xx_warn("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:
em28xx_info("No AC97 audio processor\n");
break;
case EM28XX_AC97_EM202:
em28xx_info("Empia 202 AC97 audio processor detected\n");
break;
case EM28XX_AC97_SIGMATEL:
em28xx_info("Sigmatel audio processor detected(stac 97%02x)\n",
dev->audio_mode.ac97_vendor_id & 0xff);
break;
case EM28XX_AC97_OTHER:
em28xx_warn("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;
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 */
rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
start ?
EM2874_TS1_CAPTURE_ENABLE : 0x00,
EM2874_TS1_CAPTURE_ENABLE);
} 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->board.is_webcam)
rc = em28xx_write_reg(dev, 0x13, 0x0c);
/* Enable video capture */
rc = em28xx_write_reg(dev, 0x48, 0x00);
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);
msleep(6);
} else {
/* disable video capture */
rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x27);
}
}
if (rc < 0)
return rc;
/* Switch (explicitly controlled) analog capturing LED on/off */
if (dev->mode == EM28XX_ANALOG_MODE) {
const struct em28xx_led *led;
led = em28xx_find_led(dev, EM28XX_LED_ANALOG_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, 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);
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;
}
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;
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 completition error %d.\n", urb->status);
break;
}
/* Copy data from URB */
spin_lock(&dev->slock);
dev->usb_ctl.urb_data_copy(dev, urb);
spin_unlock(&dev->slock);
/* 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("em28xx: called em28xx_uninit_usb_xfer in mode %d\n",
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);
if (usb_bufs->transfer_buffer[i]) {
usb_free_coherent(dev->udev,
urb->transfer_buffer_length,
usb_bufs->transfer_buffer[i],
urb->transfer_dma);
}
usb_free_urb(urb);
usb_bufs->urb[i] = NULL;
}
usb_bufs->transfer_buffer[i] = NULL;
}
kfree(usb_bufs->urb);
kfree(usb_bufs->transfer_buffer);
usb_bufs->urb = NULL;
usb_bufs->transfer_buffer = 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("em28xx: called em28xx_stop_urbs\n");
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;
int i;
int sb_size, pipe;
struct urb *urb;
int j, k;
em28xx_isocdbg("em28xx: called em28xx_alloc_isoc in mode %d\n", 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)) {
em28xx_errdev("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)) {
em28xx_errdev("no endpoint for analog mode and transfer type %d\n",
xfer_bulk > 0);
return -EINVAL;
}
usb_bufs = &dev->usb_ctl.analog_bufs;
} else {
em28xx_errdev("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 = kzalloc(sizeof(void *)*num_bufs, GFP_KERNEL);
if (!usb_bufs->urb) {
em28xx_errdev("cannot alloc memory for usb buffers\n");
return -ENOMEM;
}
usb_bufs->transfer_buffer = kzalloc(sizeof(void *)*num_bufs,
GFP_KERNEL);
if (!usb_bufs->transfer_buffer) {
em28xx_errdev("cannot allocate memory for usb transfer\n");
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_err("cannot alloc usb_ctl.urb %i\n", i);
em28xx_uninit_usb_xfer(dev, mode);
return -ENOMEM;
}
usb_bufs->urb[i] = urb;
usb_bufs->transfer_buffer[i] = usb_alloc_coherent(dev->udev,
sb_size, GFP_KERNEL, &urb->transfer_dma);
if (!usb_bufs->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_usb_xfer(dev, mode);
return -ENOMEM;
}
memset(usb_bufs->transfer_buffer[i], 0, sb_size);
if (xfer_bulk) { /* bulk */
pipe = usb_rcvbulkpipe(dev->udev,
mode == EM28XX_ANALOG_MODE ?
dev->analog_ep_bulk :
dev->dvb_ep_bulk);
usb_fill_bulk_urb(urb, dev->udev, pipe,
usb_bufs->transfer_buffer[i], sb_size,
em28xx_irq_callback, dev);
urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
} else { /* isoc */
pipe = usb_rcvisocpipe(dev->udev,
mode == EM28XX_ANALOG_MODE ?
dev->analog_ep_isoc :
dev->dvb_ep_isoc);
usb_fill_int_urb(urb, dev->udev, pipe,
usb_bufs->transfer_buffer[i], sb_size,
em28xx_irq_callback, dev, 1);
urb->transfer_flags = URB_ISO_ASAP |
URB_NO_TRANSFER_DMA_MAP;
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;
int i;
int rc;
int alloc;
em28xx_isocdbg("em28xx: called em28xx_init_usb_xfer in mode %d\n",
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(dev->udev, usb_bufs->urb[0]->pipe);
if (rc < 0) {
em28xx_err("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_ATOMIC);
if (rc) {
em28xx_err("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) {
ops->init(dev);
}
mutex_unlock(&em28xx_devlist_mutex);
printk(KERN_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) {
ops->fini(dev);
}
list_del(&ops->next);
mutex_unlock(&em28xx_devlist_mutex);
printk(KERN_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);
}
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)
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;
em28xx_info("Suspending extensions");
mutex_lock(&em28xx_devlist_mutex);
list_for_each_entry(ops, &em28xx_extension_devlist, next) {
if (ops->suspend)
ops->suspend(dev);
}
mutex_unlock(&em28xx_devlist_mutex);
return 0;
}
int em28xx_resume_extension(struct em28xx *dev)
{
const struct em28xx_ops *ops = NULL;
em28xx_info("Resuming extensions");
mutex_lock(&em28xx_devlist_mutex);
list_for_each_entry(ops, &em28xx_extension_devlist, next) {
if (ops->resume)
ops->resume(dev);
}
mutex_unlock(&em28xx_devlist_mutex);
return 0;
}
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