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V4L/DVB (5690): Cafe_ccic: Properly power down the sensor 

The proper method for powering down the sensor on OLPC systems has
changed somewhat; in particular, the sensor must be powered down
completely (rather than simply told to power down) or the associated
"camera active" LED will stay on.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Jonathan Corbet 2007-05-22 00:37:58 -03:00 committed by Mauro Carvalho Chehab
parent 82c01d3d5a
commit 7acf90c70c
2 changed files with 23 additions and 1 deletions
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6
drivers/media/video/cafe_ccic-regs.h
View File

@ -150,6 +150,12 @@
#define REG_GL_IMASK 0x300c /* Interrupt mask register */
#define GIMSK_CCIC_EN 0x00000004 /* CCIC Interrupt enable */
#define REG_GL_FCR 0x3038 /* GPIO functional control register */
#define GFCR_GPIO_ON 0x08 /* Camera GPIO enabled */
#define REG_GL_GPIOR 0x315c /* GPIO register */
#define GGPIO_OUT 0x80000 /* GPIO output */
#define GGPIO_VAL 0x00008 /* Output pin value */
#define REG_LEN REG_GL_IMASK + 4

18
drivers/media/video/cafe_ccic.c
View File

@ -774,6 +774,12 @@ static void cafe_ctlr_power_up(struct cafe_camera *cam)
spin_lock_irqsave(&cam->dev_lock, flags);
cafe_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN);
/*
* Part one of the sensor dance: turn the global
* GPIO signal on.
*/
cafe_reg_write(cam, REG_GL_FCR, GFCR_GPIO_ON);
cafe_reg_write(cam, REG_GL_GPIOR, GGPIO_OUT|GGPIO_VAL);
/*
* Put the sensor into operational mode (assumes OLPC-style
* wiring). Control 0 is reset - set to 1 to operate.
@ -784,6 +790,7 @@ static void cafe_ctlr_power_up(struct cafe_camera *cam)
cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C0);
// mdelay(1); /* Enough? */
spin_unlock_irqrestore(&cam->dev_lock, flags);
msleep(5); /* Just to be sure */
}
static void cafe_ctlr_power_down(struct cafe_camera *cam)
@ -792,6 +799,8 @@ static void cafe_ctlr_power_down(struct cafe_camera *cam)
spin_lock_irqsave(&cam->dev_lock, flags);
cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C1);
cafe_reg_write(cam, REG_GL_FCR, GFCR_GPIO_ON);
cafe_reg_write(cam, REG_GL_GPIOR, GGPIO_OUT);
cafe_reg_set_bit(cam, REG_CTRL1, C1_PWRDWN);
spin_unlock_irqrestore(&cam->dev_lock, flags);
}
@ -851,6 +860,7 @@ static int cafe_cam_init(struct cafe_camera *cam)
ret = 0;
cam->state = S_IDLE;
out:
cafe_ctlr_power_down(cam);
mutex_unlock(&cam->s_mutex);
return ret;
}
@ -2103,10 +2113,16 @@ static int cafe_pci_probe(struct pci_dev *pdev,
ret = request_irq(pdev->irq, cafe_irq, IRQF_SHARED, "cafe-ccic", cam);
if (ret)
goto out_iounmap;
/*
* Initialize the controller and leave it powered up. It will
* stay that way until the sensor driver shows up.
*/
cafe_ctlr_init(cam);
cafe_ctlr_power_up(cam);
/*
* Set up I2C/SMBUS communications
* Set up I2C/SMBUS communications. We have to drop the mutex here
* because the sensor could attach in this call chain, leading to
* unsightly deadlocks.
*/
mutex_unlock(&cam->s_mutex); /* attach can deadlock */
ret = cafe_smbus_setup(cam);