Re: [PATCH v3 2/2] iio: twl6030-gpadc: TWL6030, TWL6032 GPADC driver

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




A couple of comments inline.

On 07/12/2013 09:18 AM, Oleksandr Kozaruk wrote:
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index ab0767e6..87d699e 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -157,4 +157,12 @@ config VIPERBOARD_ADC
  	  Say yes here to access the ADC part of the Nano River
  	  Technologies Viperboard.

+config TWL6030_GPADC
+	tristate "TWL6030 GPADC (General Purpose A/D Convertor) Support"
+	depends on TWL4030_CORE
+	default n
+	help
+	  Say yes here if you want support for the TWL6030 General Purpose
+	  A/D Convertor.
+

Keep it in alphabetical order

  endmenu
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 0a825be..8b05633 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -17,3 +17,4 @@ obj-$(CONFIG_MAX1363) += max1363.o
  obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o
  obj-$(CONFIG_TI_AM335X_ADC) += ti_am335x_adc.o
  obj-$(CONFIG_VIPERBOARD_ADC) += viperboard_adc.o
+obj-$(CONFIG_TWL6030_GPADC) += twl6030-gpadc.o

Same here.

diff --git a/drivers/iio/adc/twl6030-gpadc.c b/drivers/iio/adc/twl6030-gpadc.c
new file mode 100644
index 0000000..6ceb789
--- /dev/null
+++ b/drivers/iio/adc/twl6030-gpadc.c
@@ -0,0 +1,1019 @@
[...]
+static u8 twl6032_channel_to_reg(int channel)
+{
+	return TWL6032_GPADC_GPCH0_LSB;

There is more than one channel, isn't there?

[...]
> +static int twl6030_gpadc_read_raw(struct iio_dev *indio_dev,
> +			     const struct iio_chan_spec *chan,
> +			     int *val, int *val2, long mask)
> +{
> +	struct twl6030_gpadc_data *gpadc = iio_priv(indio_dev);
> +	int ret = -EINVAL;
> +
> +	mutex_lock(&gpadc->lock);
> +
> +	ret = gpadc->pdata->start_conversion(chan->channel);
> +	if (ret) {
> +		dev_err(gpadc->dev, "failed to start conversion\n");
> +		goto err;
> +	}
> +	/* wait for conversion to complete */
> +	wait_for_completion_interruptible_timeout(&gpadc->irq_complete,
> +						msecs_to_jiffies(5000));

wait_for_completion_interruptible_timeout() can return either a negative error code if it was interrupted, 0 if it timed out, or a positive value if it was successfully completed. You need to handle all three cases. Have a look at other existing drivers to see how to do this properly.

> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_RAW:
> +		ret = twl6030_gpadc_get_raw(gpadc, chan->channel, val);
> +		ret = ret ? -EIO : IIO_VAL_INT;
> +		break;
> +
> +	case IIO_CHAN_INFO_PROCESSED:
> +		ret = twl6030_gpadc_get_processed(gpadc, chan->channel, val);
> +		ret = ret ? -EIO : IIO_VAL_INT;
> +		break;
> +
> +	default:
> +		break;
> +	}
> +err:
> +	mutex_unlock(&gpadc->lock);
> +
> +	return ret;
> +}

+}
+
[...]
+static int twl6030_gpadc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct twl6030_gpadc_data *gpadc;
+	const struct twl6030_gpadc_platform_data *pdata;
+	const struct of_device_id *match;
+	struct iio_dev *indio_dev;
+	int irq;
+	int ret = 0;
+
+	match = of_match_device(of_match_ptr(of_twl6030_match_tbl), dev);
+	pdata = match ? match->data : dev->platform_data;
+
+	if (!pdata)
+		return -EINVAL;
+
+	indio_dev = iio_device_alloc(sizeof(struct twl6030_gpadc_data));

sizeof(*gpadc)

+	if (!indio_dev) {
+		dev_err(dev, "failed allocating iio device\n");
+		ret = -ENOMEM;
+	}
+
+	gpadc = iio_priv(indio_dev);
+
+	gpadc->twl6030_cal_tbl = devm_kzalloc(dev,
+					sizeof(struct twl6030_chnl_calib) *
+					pdata->nchannels, GFP_KERNEL);
+	if (!gpadc->twl6030_cal_tbl)
+		goto err;
+
+	gpadc->dev = dev;
+	gpadc->pdata = pdata;
+
+	platform_set_drvdata(pdev, indio_dev);
+	mutex_init(&gpadc->lock);
+	init_completion(&gpadc->irq_complete);
+
+	ret = pdata->calibrate(gpadc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to read calibration registers\n");
+		goto err;
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(&pdev->dev, "failed to get irq\n");
+		goto err;
+	}
+
+	ret = devm_request_threaded_irq(dev, irq, NULL,
+					twl6030_gpadc_irq_handler,
+					IRQF_ONESHOT, "twl6030_gpadc", gpadc);

You access memory in the interrupt handler which is freed before the interrupt handler is freed.

+	if (ret) {
+		dev_dbg(&pdev->dev, "could not request irq\n");
+		goto err;
+	}
+
+	ret = twl6030_gpadc_enable_irq(TWL6030_GPADC_RT_SW1_EOC_MASK);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to enable GPADC interrupt\n");
+		goto err;
+	}
+	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, TWL6030_GPADCS,
+					TWL6030_REG_TOGGLE1);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to enable GPADC module\n");
+		goto err;
+	}
+
+	indio_dev->name = DRIVER_NAME;
+	indio_dev->dev.parent = dev;
+	indio_dev->info = &twl6030_gpadc_iio_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = pdata->iio_channels;
+	indio_dev->num_channels = pdata->nchannels;
+
+	ret = iio_device_register(indio_dev);
+	if (ret)
+		goto err;
+
+	return ret;
+err:
+	iio_device_free(indio_dev);
+	return ret;
+}
+
[...]
+static int twl6030_gpadc_suspend(struct device *pdev)
+{
+	int ret;
+
+	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, TWL6030_GPADCR,
+				TWL6030_REG_TOGGLE1);
+	if (ret)
+		dev_err(pdev, "error reseting GPADC (%d)!\n", ret);
+
+	return 0;
+};
+
+static int twl6030_gpadc_resume(struct device *pdev)
+{
+	int ret;
+
+	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, TWL6030_GPADCS,
+				TWL6030_REG_TOGGLE1);
+	if (ret)
+		dev_err(pdev, "error setting GPADC (%d)!\n", ret);
+
+	return 0;
+};
+
+static const struct dev_pm_ops twl6030_gpadc_pm_ops = {
+	.suspend = twl6030_gpadc_suspend,
+	.resume = twl6030_gpadc_resume,
+};

SIMPLE_DEV_PM_OPS?

[...]
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux Arm (vger)]     [ARM Kernel]     [ARM MSM]     [Linux Tegra]     [Linux WPAN Networking]     [Linux Wireless Networking]     [Maemo Users]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Trails]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux