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

[Adam Lee]

Hi Peter, I sent a V2 with corrected wording. My bad!

And yes I agree that register setting should be done in the ADC driver.
Let me see what I can do, and will report back.

Thanks,

Adam

On Mon, Jul 20, 2015 at 11:54 AM, Peter Meerwald <pmeerw at pmeerw.net> wrote:
> On Mon, 20 Jul 2015, 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
>
> comments below
>
>> Signed-off-by: Adam YH Lee <adam.yh.lee at gmail.com>
>> ---
>>  drivers/iio/adc/twl4030-madc.c | 14 ++++++++++++++
>>  drivers/phy/phy-twl4030-usb.c  |  7 +++++++
>>  2 files changed, 21 insertions(+)
>>
>> diff --git a/drivers/iio/adc/twl4030-madc.c b/drivers/iio/adc/twl4030-madc.c
>> index 94c5f05..b5020ab 100644
>> --- a/drivers/iio/adc/twl4030-madc.c
>> +++ b/drivers/iio/adc/twl4030-madc.c
>> @@ -45,6 +45,7 @@
>>  #include <linux/types.h>
>>  #include <linux/gfp.h>
>>  #include <linux/err.h>
>> +#include <linux/regulator/consumer.h>
>>
>>  #include <linux/iio/iio.h>
>>
>> @@ -52,6 +53,7 @@
>>   * 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 +62,7 @@
>>  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;
>> @@ -848,6 +851,14 @@ static int twl4030_madc_probe(struct platform_device *pdev)
>>               goto err_i2c;
>>       }
>>
>> +     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 be enable 3v1 bias regulator\n");
>
> please fix wording, "could not enable usb 3v1 bias regulator" probably
>
>> +
>>       return 0;
>>
>>  err_i2c:
>> @@ -867,6 +878,9 @@ 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);
>> +     regulator_put(madc->usb3v1);
>> +
>>       return 0;
>>  }
>>
>> diff --git a/drivers/phy/phy-twl4030-usb.c b/drivers/phy/phy-twl4030-usb.c
>> index 7b04bef..88fc7d7 100644
>> --- a/drivers/phy/phy-twl4030-usb.c
>> +++ b/drivers/phy/phy-twl4030-usb.c
>> @@ -144,6 +144,9 @@
>>  #define PMBR1                                0x0D
>>  #define GPIO_USB_4PIN_ULPI_2430C     (3 << 0)
>>
>> +#define TWL4030_USB_SEL_MADC_MCPC    (1<<3)
>> +#define TWL4030_USB_CARKIT_ANA_CTRL  0xBB
>> +
>>  struct twl4030_usb {
>>       struct usb_phy          phy;
>>       struct device           *dev;
>> @@ -459,6 +462,10 @@ static int twl4030_phy_power_on(struct phy *phy)
>>               twl4030_i2c_access(twl, 0);
>>       schedule_delayed_work(&twl->id_workaround_work, 0);
>>
>> +     twl4030_usb_write(twl, TWL4030_USB_CARKIT_ANA_CTRL,
>> +             twl4030_usb_read(twl, TWL4030_USB_CARKIT_ANA_CTRL) |
>> +             TWL4030_USB_SEL_MADC_MCPC);
>> +
>
> shouldn't this be done is the adc driver?
>
>>       return 0;
>>  }
>>
>>
>
> --
>
> Peter Meerwald
> +43-664-2444418 (mobile)