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V4L/DVB (9764): em28xx: Add support for suspend the device when not used

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Several chips may be turned off when the device is not used, like audio,
video and dvb demods. This patch adds a gpio callback at the core
structs to allow turning off such devices.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2008-11-27 09:10:40 -03:00
parent f502e86184
commit 2fe3e2ee72
5 changed files with 21 additions and 15 deletions
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2
drivers/media/video/em28xx/em28xx-cards.c
View File

@ -1456,7 +1456,7 @@ void em28xx_pre_card_setup(struct em28xx *dev)
em28xx_set_mode(dev, EM28XX_ANALOG_MODE);
/* Unlock device */
em28xx_set_mode(dev, EM28XX_MODE_UNDEFINED);
em28xx_set_mode(dev, EM28XX_SUSPEND);
}
static void em28xx_setup_xc3028(struct em28xx *dev, struct xc2028_ctrl *ctl)

21
drivers/media/video/em28xx/em28xx-core.c
View File

@ -737,12 +737,14 @@ int em28xx_gpio_set(struct em28xx *dev, struct em28xx_reg_seq *gpio)
if (!gpio)
return rc;
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);
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) {
@ -767,9 +769,12 @@ 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) {
if (set_mode == EM28XX_SUSPEND) {
dev->mode = set_mode;
return 0;
/* FIXME: add suspend support for ac97 */
return em28xx_gpio_set(dev, dev->board.suspend_gpio);
}
dev->mode = set_mode;

8
drivers/media/video/em28xx/em28xx-dvb.c
View File

@ -161,7 +161,7 @@ static int stop_streaming(struct em28xx_dvb *dvb)
em28xx_uninit_isoc(dev);
em28xx_set_mode(dev, EM28XX_MODE_UNDEFINED);
em28xx_set_mode(dev, EM28XX_SUSPEND);
return 0;
}
@ -215,7 +215,7 @@ static int em28xx_dvb_bus_ctrl(struct dvb_frontend *fe, int acquire)
if (acquire)
return em28xx_set_mode(dev, EM28XX_DIGITAL_MODE);
else
return em28xx_set_mode(dev, EM28XX_MODE_UNDEFINED);
return em28xx_set_mode(dev, EM28XX_SUSPEND);
}
/* ------------------------------------------------------------------ */
@ -466,12 +466,12 @@ static int dvb_init(struct em28xx *dev)
if (result < 0)
goto out_free;
em28xx_set_mode(dev, EM28XX_MODE_UNDEFINED);
em28xx_set_mode(dev, EM28XX_SUSPEND);
printk(KERN_INFO "Successfully loaded em28xx-dvb\n");
return 0;
out_free:
em28xx_set_mode(dev, EM28XX_MODE_UNDEFINED);
em28xx_set_mode(dev, EM28XX_SUSPEND);
kfree(dvb);
dev->dvb = NULL;
return result;

2
drivers/media/video/em28xx/em28xx-video.c
View File

@ -1697,7 +1697,7 @@ static int em28xx_v4l2_close(struct inode *inode, struct file *filp)
/* do this before setting alternate! */
em28xx_uninit_isoc(dev);
em28xx_set_mode(dev, EM28XX_MODE_UNDEFINED);
em28xx_set_mode(dev, EM28XX_SUSPEND);
/* set alternate 0 */
dev->alt = 0;

3
drivers/media/video/em28xx/em28xx.h
View File

@ -160,7 +160,7 @@
#define EM2800_I2C_WRITE_TIMEOUT 20
enum em28xx_mode {
EM28XX_MODE_UNDEFINED,
EM28XX_SUSPEND,
EM28XX_ANALOG_MODE,
EM28XX_DIGITAL_MODE,
};
@ -336,6 +336,7 @@ struct em28xx_board {
unsigned int tda9887_conf;
struct em28xx_reg_seq *dvb_gpio;
struct em28xx_reg_seq *suspend_gpio;
unsigned int is_em2800:1;
unsigned int has_msp34xx:1;