[V4] [TWL4030 MADC] Correction and clean-up

[V4] [TWL4030 MADC] Correction and clean-up

[Adam YH Lee]

The V4 of this patch addresses issues raised by Jonathan [1].

"iio_device_register" call should be the last call in the probe.
All regulators should be configured before that call.

Remove devm_regulator_put as it is not necessary. "devm_allocators"
(devm_regulator_get, in this case) does device removal as well as error
handling.

[1] http://www.spinics.net/lists/linux-omap/msg120871.html

Adam YH Lee (1):
  [TWL4030 MADC] Fix ADC[3:6] readings

 drivers/iio/adc/twl4030-madc.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

-- 
2.1.4

[V4] [TWL4030 MADC] Fix ADC[3:6] readings

[Adam YH Lee]

MADC[3:6] reads incorrect values without these two following changes:

- enable the 3v1 bias regulator for ADC[3:6]
- configure ADC[3:6] lines as input, not as USB

Signed-off-by: Adam YH Lee <adam.yh.lee@gmail.com>
---
 drivers/iio/adc/twl4030-madc.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/drivers/iio/adc/twl4030-madc.c b/drivers/iio/adc/twl4030-madc.c
index 94c5f05..8c58498 100644
--- a/drivers/iio/adc/twl4030-madc.c
+++ b/drivers/iio/adc/twl4030-madc.c
@@ -45,13 +45,18 @@
 #include <linux/types.h>
 #include <linux/gfp.h>
 #include <linux/err.h>
+#include <linux/regulator/consumer.h>
 
 #include <linux/iio/iio.h>
 
+#define TWL4030_USB_SEL_MADC_MCPC	(1<<3)
+#define TWL4030_USB_CARKIT_ANA_CTRL	0xBB
+
 /**
  * struct twl4030_madc_data - a container for madc info
  * @dev:		Pointer to device structure for madc
  * @lock:		Mutex protecting this data structure
+ * @regulator:		Pointer to bias regulator for madc
  * @requests:		Array of request struct corresponding to SW1, SW2 and RT
  * @use_second_irq:	IRQ selection (main or co-processor)
  * @imr:		Interrupt mask register of MADC
@@ -60,6 +65,7 @@
 struct twl4030_madc_data {
 	struct device *dev;
 	struct mutex lock;	/* mutex protecting this data structure */
+	struct regulator *usb3v1;
 	struct twl4030_madc_request requests[TWL4030_MADC_NUM_METHODS];
 	bool use_second_irq;
 	u8 imr;
@@ -842,6 +848,32 @@ static int twl4030_madc_probe(struct platform_device *pdev)
 	}
 	twl4030_madc = madc;
 
+	/* Configure MADC[3:6] */
+	ret = twl_i2c_read_u8(TWL_MODULE_USB, &regval,
+			TWL4030_USB_CARKIT_ANA_CTRL);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to read reg CARKIT_ANA_CTRL  0x%X\n",
+				TWL4030_USB_CARKIT_ANA_CTRL);
+		goto err_i2c;
+	}
+	regval |= TWL4030_USB_SEL_MADC_MCPC;
+	ret = twl_i2c_write_u8(TWL_MODULE_USB, regval,
+				 TWL4030_USB_CARKIT_ANA_CTRL);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to write reg CARKIT_ANA_CTRL 0x%X\n",
+				TWL4030_USB_CARKIT_ANA_CTRL);
+		goto err_i2c;
+	}
+
+	/* Enable 3v1 bias regulator for MADC[3:6] */
+	madc->usb3v1 = devm_regulator_get(madc->dev, "vusb3v1");
+	if (IS_ERR(madc->usb3v1))
+		return -ENODEV;
+
+	ret = regulator_enable(madc->usb3v1);
+	if (ret)
+		dev_err(madc->dev, "could not enable 3v1 bias regulator\n");
+
 	ret = iio_device_register(iio_dev);
 	if (ret) {
 		dev_err(&pdev->dev, "could not register iio device\n");
@@ -867,6 +899,8 @@ static int twl4030_madc_remove(struct platform_device *pdev)
 	twl4030_madc_set_current_generator(madc, 0, 0);
 	twl4030_madc_set_power(madc, 0);
 
+	regulator_disable(madc->usb3v1);
+
 	return 0;
 }
 
-- 
2.1.4

[V4] [TWL4030 MADC] Fix ADC[3:6] readings

[Jonathan Cameron]

On 04/08/15 19:15, Adam YH Lee wrote:
> MADC[3:6] reads incorrect values without these two following changes:
> 
> - enable the 3v1 bias regulator for ADC[3:6]
> - configure ADC[3:6] lines as input, not as USB
> 
> Signed-off-by: Adam YH Lee <adam.yh.lee@gmail.com>
I'd ideally like an ack from the driver author or Sebastian as this isn't
a driver I'm particular familiar with.

Also, for future reference, patches should be titled something like
[Patch v4] iio: twl4030 madc: Fix ADC[3:6] readings.
(the patch bit is standard, the rest is iio convention)

Jonathan

> ---
>  drivers/iio/adc/twl4030-madc.c | 34 ++++++++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 
> diff --git a/drivers/iio/adc/twl4030-madc.c b/drivers/iio/adc/twl4030-madc.c
> index 94c5f05..8c58498 100644
> --- a/drivers/iio/adc/twl4030-madc.c
> +++ b/drivers/iio/adc/twl4030-madc.c
> @@ -45,13 +45,18 @@
>  #include <linux/types.h>
>  #include <linux/gfp.h>
>  #include <linux/err.h>
> +#include <linux/regulator/consumer.h>
>  
>  #include <linux/iio/iio.h>
>  
> +#define TWL4030_USB_SEL_MADC_MCPC	(1<<3)
> +#define TWL4030_USB_CARKIT_ANA_CTRL	0xBB
> +
>  /**
>   * struct twl4030_madc_data - a container for madc info
>   * @dev:		Pointer to device structure for madc
>   * @lock:		Mutex protecting this data structure
> + * @regulator:		Pointer to bias regulator for madc
>   * @requests:		Array of request struct corresponding to SW1, SW2 and RT
>   * @use_second_irq:	IRQ selection (main or co-processor)
>   * @imr:		Interrupt mask register of MADC
> @@ -60,6 +65,7 @@
>  struct twl4030_madc_data {
>  	struct device *dev;
>  	struct mutex lock;	/* mutex protecting this data structure */
> +	struct regulator *usb3v1;
>  	struct twl4030_madc_request requests[TWL4030_MADC_NUM_METHODS];
>  	bool use_second_irq;
>  	u8 imr;
> @@ -842,6 +848,32 @@ static int twl4030_madc_probe(struct platform_device *pdev)
>  	}
>  	twl4030_madc = madc;
>  
> +	/* Configure MADC[3:6] */
> +	ret = twl_i2c_read_u8(TWL_MODULE_USB, &regval,
> +			TWL4030_USB_CARKIT_ANA_CTRL);
> +	if (ret) {
> +		dev_err(&pdev->dev, "unable to read reg CARKIT_ANA_CTRL  0x%X\n",
> +				TWL4030_USB_CARKIT_ANA_CTRL);
> +		goto err_i2c;
> +	}
> +	regval |= TWL4030_USB_SEL_MADC_MCPC;
> +	ret = twl_i2c_write_u8(TWL_MODULE_USB, regval,
> +				 TWL4030_USB_CARKIT_ANA_CTRL);
> +	if (ret) {
> +		dev_err(&pdev->dev, "unable to write reg CARKIT_ANA_CTRL 0x%X\n",
> +				TWL4030_USB_CARKIT_ANA_CTRL);
> +		goto err_i2c;
> +	}
> +
> +	/* Enable 3v1 bias regulator for MADC[3:6] */
> +	madc->usb3v1 = devm_regulator_get(madc->dev, "vusb3v1");
> +	if (IS_ERR(madc->usb3v1))
> +		return -ENODEV;
> +
> +	ret = regulator_enable(madc->usb3v1);
> +	if (ret)
> +		dev_err(madc->dev, "could not enable 3v1 bias regulator\n");
> +
>  	ret = iio_device_register(iio_dev);
>  	if (ret) {
>  		dev_err(&pdev->dev, "could not register iio device\n");
> @@ -867,6 +899,8 @@ static int twl4030_madc_remove(struct platform_device *pdev)
>  	twl4030_madc_set_current_generator(madc, 0, 0);
>  	twl4030_madc_set_power(madc, 0);
>  
> +	regulator_disable(madc->usb3v1);
> +
>  	return 0;
>  }
>  
> 

[V4] [TWL4030 MADC] Fix ADC[3:6] readings

[Jonathan Cameron]

On 10/08/15 17:56, Adam Lee wrote:
> Yes I will do a better job in following the patch submission conventions.
> Thanks for your comment Jonathan.
> 
> @Sebastian, let me know if you have any concerns with the patch.
This has been sat around for long enough that I suspect Sebastian isn't
going to reply.  As such I've just applied it as is to the fixes-togreg
branch of iio.git (with some editing of the patch description!)

Thanks,

Jonathan
> 
> 
> 
> On Sat, Aug 8, 2015 at 8:15 AM Jonathan Cameron <jic23 at kernel.org <mailto:jic23@kernel.org>> wrote:
> 
>     On 04/08/15 19:15, Adam YH Lee wrote:
>     > MADC[3:6] reads incorrect values without these two following changes:
>     >
>     > - enable the 3v1 bias regulator for ADC[3:6]
>     > - configure ADC[3:6] lines as input, not as USB
>     >
>     > Signed-off-by: Adam YH Lee <adam.yh.lee at gmail.com <mailto:adam.yh.lee@gmail.com>>
>     I'd ideally like an ack from the driver author or Sebastian as this isn't
>     a driver I'm particular familiar with.
> 
>     Also, for future reference, patches should be titled something like
>     [Patch v4] iio: twl4030 madc: Fix ADC[3:6] readings.
>     (the patch bit is standard, the rest is iio convention)
> 
>     Jonathan
> 
>     > ---
>     >  drivers/iio/adc/twl4030-madc.c | 34 ++++++++++++++++++++++++++++++++++
>     >  1 file changed, 34 insertions(+)
>     >
>     > diff --git a/drivers/iio/adc/twl4030-madc.c b/drivers/iio/adc/twl4030-madc.c
>     > index 94c5f05..8c58498 100644
>     > --- a/drivers/iio/adc/twl4030-madc.c
>     > +++ b/drivers/iio/adc/twl4030-madc.c
>     > @@ -45,13 +45,18 @@
>     >  #include <linux/types.h>
>     >  #include <linux/gfp.h>
>     >  #include <linux/err.h>
>     > +#include <linux/regulator/consumer.h>
>     >
>     >  #include <linux/iio/iio.h>
>     >
>     > +#define TWL4030_USB_SEL_MADC_MCPC    (1<<3)
>     > +#define TWL4030_USB_CARKIT_ANA_CTRL  0xBB
>     > +
>     >  /**
>     >   * struct twl4030_madc_data - a container for madc info
>     >   * @dev:             Pointer to device structure for madc
>     >   * @lock:            Mutex protecting this data structure
>     > + * @regulator:               Pointer to bias regulator for madc
>     >   * @requests:                Array of request struct corresponding to SW1, SW2 and RT
>     >   * @use_second_irq:  IRQ selection (main or co-processor)
>     >   * @imr:             Interrupt mask register of MADC
>     > @@ -60,6 +65,7 @@
>     >  struct twl4030_madc_data {
>     >       struct device *dev;
>     >       struct mutex lock;      /* mutex protecting this data structure */
>     > +     struct regulator *usb3v1;
>     >       struct twl4030_madc_request requests[TWL4030_MADC_NUM_METHODS];
>     >       bool use_second_irq;
>     >       u8 imr;
>     > @@ -842,6 +848,32 @@ static int twl4030_madc_probe(struct platform_device *pdev)
>     >       }
>     >       twl4030_madc = madc;
>     >
>     > +     /* Configure MADC[3:6] */
>     > +     ret = twl_i2c_read_u8(TWL_MODULE_USB, &regval,
>     > +                     TWL4030_USB_CARKIT_ANA_CTRL);
>     > +     if (ret) {
>     > +             dev_err(&pdev->dev, "unable to read reg CARKIT_ANA_CTRL  0x%X\n",
>     > +                             TWL4030_USB_CARKIT_ANA_CTRL);
>     > +             goto err_i2c;
>     > +     }
>     > +     regval |= TWL4030_USB_SEL_MADC_MCPC;
>     > +     ret = twl_i2c_write_u8(TWL_MODULE_USB, regval,
>     > +                              TWL4030_USB_CARKIT_ANA_CTRL);
>     > +     if (ret) {
>     > +             dev_err(&pdev->dev, "unable to write reg CARKIT_ANA_CTRL 0x%X\n",
>     > +                             TWL4030_USB_CARKIT_ANA_CTRL);
>     > +             goto err_i2c;
>     > +     }
>     > +
>     > +     /* Enable 3v1 bias regulator for MADC[3:6] */
>     > +     madc->usb3v1 = devm_regulator_get(madc->dev, "vusb3v1");
>     > +     if (IS_ERR(madc->usb3v1))
>     > +             return -ENODEV;
>     > +
>     > +     ret = regulator_enable(madc->usb3v1);
>     > +     if (ret)
>     > +             dev_err(madc->dev, "could not enable 3v1 bias regulator\n");
>     > +
>     >       ret = iio_device_register(iio_dev);
>     >       if (ret) {
>     >               dev_err(&pdev->dev, "could not register iio device\n");
>     > @@ -867,6 +899,8 @@ static int twl4030_madc_remove(struct platform_device *pdev)
>     >       twl4030_madc_set_current_generator(madc, 0, 0);
>     >       twl4030_madc_set_power(madc, 0);
>     >
>     > +     regulator_disable(madc->usb3v1);
>     > +
>     >       return 0;
>     >  }
>     >
>     >
>