[PATCH 4.0 033/148] iio: adc: cc10001: Fix incorrect use of power-up/power-down register

Greg Kroah-Hartman
2015-06-03T12:51:57Z

From: Naidu Tellapati <naidu.tellapati@imgtec.com>

commit 713276ea88a295a79aa6633ba639ed47692a8de4 upstream.

At present we are incorrectly setting the register to 0x1 to power up
the ADC. Since it is an active high power down register, we need to set
the register to 0x0 to actually power up. Conversely, writing 0x1 to the
register powers it down.

This commit adds a couple of helpers to make the code clearer and then
use them to do the power-up/power-down properly.

Fixes: 1664f6a5b0c8 ("iio: adc: Cosmic Circuits 10001 ADC driver")
Signed-off-by: Naidu Tellapati <naidu.tellapati@imgtec.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@imgtec.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/iio/adc/cc10001_adc.c | 33 +++++++++++++++++++--------------
1 file changed, 19 insertions(+), 14 deletions(-)

--- a/drivers/iio/adc/cc10001_adc.c
+++ b/drivers/iio/adc/cc10001_adc.c
@@ -35,8 +35,9 @@
#define CC10001_ADC_EOC_SET BIT(0)

#define CC10001_ADC_CHSEL_SAMPLED 0x0c
-#define CC10001_ADC_POWER_UP 0x10
-#define CC10001_ADC_POWER_UP_SET BIT(0)
+#define CC10001_ADC_POWER_DOWN 0x10
+#define CC10001_ADC_POWER_DOWN_SET BIT(0)
+
#define CC10001_ADC_DEBUG 0x14
#define CC10001_ADC_DATA_COUNT 0x20

@@ -78,6 +79,18 @@ static inline u32 cc10001_adc_read_reg(s
return readl(adc_dev->reg_base + reg);
}

+static void cc10001_adc_power_up(struct cc10001_adc_device *adc_dev)
+{
+ cc10001_adc_write_reg(adc_dev, CC10001_ADC_POWER_DOWN, 0);
+ ndelay(adc_dev->start_delay_ns);
+}
+
+static void cc10001_adc_power_down(struct cc10001_adc_device *adc_dev)
+{
+ cc10001_adc_write_reg(adc_dev, CC10001_ADC_POWER_DOWN,
+ CC10001_ADC_POWER_DOWN_SET);
+}
+
static void cc10001_adc_start(struct cc10001_adc_device *adc_dev,
unsigned int channel)
{
@@ -139,11 +152,7 @@ static irqreturn_t cc10001_adc_trigger_h

mutex_lock(&adc_dev->lock);

- cc10001_adc_write_reg(adc_dev, CC10001_ADC_POWER_UP,
- CC10001_ADC_POWER_UP_SET);
-
- /* Wait for 8 (6+2) clock cycles before activating START */
- ndelay(adc_dev->start_delay_ns);
+ cc10001_adc_power_up(adc_dev);

/* Calculate delay step for eoc and sampled data */
delay_ns = adc_dev->eoc_delay_ns / CC10001_MAX_POLL_COUNT;
@@ -167,7 +176,7 @@ static irqreturn_t cc10001_adc_trigger_h
}

done:
- cc10001_adc_write_reg(adc_dev, CC10001_ADC_POWER_UP, 0);
+ cc10001_adc_power_down(adc_dev);

mutex_unlock(&adc_dev->lock);

@@ -186,11 +195,7 @@ static u16 cc10001_adc_read_raw_voltage(
unsigned int delay_ns;
u16 val;

- cc10001_adc_write_reg(adc_dev, CC10001_ADC_POWER_UP,
- CC10001_ADC_POWER_UP_SET);
-
- /* Wait for 8 (6+2) clock cycles before activating START */
- ndelay(adc_dev->start_delay_ns);
+ cc10001_adc_power_up(adc_dev);

/* Calculate delay step for eoc and sampled data */
delay_ns = adc_dev->eoc_delay_ns / CC10001_MAX_POLL_COUNT;
@@ -199,7 +204,7 @@ static u16 cc10001_adc_read_raw_voltage(

val = cc10001_adc_poll_done(indio_dev, chan->channel, delay_ns);

- cc10001_adc_write_reg(adc_dev, CC10001_ADC_POWER_UP, 0);
+ cc10001_adc_power_down(adc_dev);

return val;
}