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authorAndy Walls <awalls@radix.net>2008-07-13 19:05:25 -0300
committerMauro Carvalho Chehab <mchehab@infradead.org>2008-07-20 07:24:59 -0300
commit8abdd00dcc6a58cab3afe6a23a0ce819dc08049a (patch)
treee12468caf7a74379a5833827f6b83ea77d37df0c /drivers/media/video/cx18/cx18-gpio.c
parent2c6a37bb076b9718c6362d4ffa1c7e58fdb1a0e9 (diff)
V4L/DVB (8331): cx18: Add locking for struct cx18 GPIO state variables
cx18: Add locking for struct cx18 GPIO state variables in anticpation of adding IR microcontroller reset support for use by external IR modules. Signed-off-by: Andy Walls <awalls@radix.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'drivers/media/video/cx18/cx18-gpio.c')
-rw-r--r--drivers/media/video/cx18/cx18-gpio.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/media/video/cx18/cx18-gpio.c b/drivers/media/video/cx18/cx18-gpio.c
index 089bad6d85a..d753a40973b 100644
--- a/drivers/media/video/cx18/cx18-gpio.c
+++ b/drivers/media/video/cx18/cx18-gpio.c
@@ -69,6 +69,7 @@ void cx18_reset_i2c_slaves_gpio(struct cx18 *cx)
/* Assuming that the masks are a subset of the bits in gpio_dir */
/* Assert */
+ mutex_lock(&cx->gpio_lock);
cx->gpio_val =
(cx->gpio_val | p->active_hi_mask) & ~(p->active_lo_mask);
gpio_write(cx);
@@ -79,10 +80,12 @@ void cx18_reset_i2c_slaves_gpio(struct cx18 *cx)
(cx->gpio_val | p->active_lo_mask) & ~(p->active_hi_mask);
gpio_write(cx);
schedule_timeout_uninterruptible(msecs_to_jiffies(p->msecs_recovery));
+ mutex_unlock(&cx->gpio_lock);
}
void cx18_gpio_init(struct cx18 *cx)
{
+ mutex_lock(&cx->gpio_lock);
cx->gpio_dir = cx->card->gpio_init.direction;
cx->gpio_val = cx->card->gpio_init.initial_value;
@@ -91,14 +94,17 @@ void cx18_gpio_init(struct cx18 *cx)
cx->gpio_val |= 1 << cx->card->xceive_pin;
}
- if (cx->gpio_dir == 0)
+ if (cx->gpio_dir == 0) {
+ mutex_unlock(&cx->gpio_lock);
return;
+ }
CX18_DEBUG_INFO("GPIO initial dir: %08x/%08x out: %08x/%08x\n",
read_reg(CX18_REG_GPIO_DIR1), read_reg(CX18_REG_GPIO_DIR2),
read_reg(CX18_REG_GPIO_OUT1), read_reg(CX18_REG_GPIO_OUT2));
gpio_write(cx);
+ mutex_unlock(&cx->gpio_lock);
}
/* Xceive tuner reset function */
@@ -112,13 +118,16 @@ int cx18_reset_tuner_gpio(void *dev, int cmd, int value)
return 0;
CX18_DEBUG_INFO("Resetting tuner\n");
+ mutex_lock(&cx->gpio_lock);
cx->gpio_val &= ~(1 << cx->card->xceive_pin);
-
gpio_write(cx);
+ mutex_unlock(&cx->gpio_lock);
schedule_timeout_interruptible(msecs_to_jiffies(1));
+ mutex_lock(&cx->gpio_lock);
cx->gpio_val |= 1 << cx->card->xceive_pin;
gpio_write(cx);
+ mutex_unlock(&cx->gpio_lock);
schedule_timeout_interruptible(msecs_to_jiffies(1));
return 0;
}
@@ -151,8 +160,10 @@ int cx18_gpio(struct cx18 *cx, unsigned int command, void *arg)
return -EINVAL;
}
if (mask) {
+ mutex_lock(&cx->gpio_lock);
cx->gpio_val = (cx->gpio_val & ~mask) | (data & mask);
gpio_write(cx);
+ mutex_unlock(&cx->gpio_lock);
}
return 0;
}