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Message-ID: <51E05F6C.1060506@metafoo.de>
Date: Fri, 12 Jul 2013 21:56:28 +0200
From: Lars-Peter Clausen <lars@...afoo.de>
To: Oleksandr Kozaruk <oleksandr.kozaruk@...com>
CC: tony@...mide.com, benoit.cousson@...aro.org, rnayak@...com,
peter.ujfalusi@...com, kishon@...com, jic23@....ac.uk,
grant.likely@...aro.org, rob.herring@...xeda.com,
sameo@...ux.intel.com, ch.naveen@...sung.com, poeschel@...onage.de,
milo.kim@...com, balajitk@...com, gg@...mlogic.co.uk,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-iio@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
linux-omap@...r.kernel.org
Subject: Re: [PATCH v3 2/2] iio: twl6030-gpadc: TWL6030, TWL6032 GPADC driver
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?
[...]
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