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Message-ID: <20150820063807.GA3708@Sanchayan-Arch.toradex.int>
Date: Thu, 20 Aug 2015 12:08:07 +0530
From: maitysanchayan@...il.com
To: B38611@...escale.com
Cc: jic23@...nel.org, linux-iio@...r.kernel.org, stefan@...er.ch,
pmeerw@...erw.net, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4] iio: adc: vf610: Add IIO buffer support for Vybrid ADC
Hello Fugang Duan,
Can I have your ACK if you are ok with the changes made by the
patch?
Thanks & Regards,
Sanchayan Maity.
On 15-08-17 21:21:40, Sanchayan Maity wrote:
> This patch adds support for IIO buffer to the Vybrid ADC driver.
> IIO triggered buffer infrastructure along with iio sysfs trigger
> is used to leverage continuous sampling support provided by the
> ADC block.
>
> Signed-off-by: Sanchayan Maity <maitysanchayan@...il.com>
> ---
>
> Changes since v3:
> Fix iio_buffer_setup_ops for postenable and predisable functions
> to match pairwise. Before this the predisable work was being done
> in postdisable.
>
> Changes since v2:
> 1. Fix the wrong buffer size for statically allocated buffer
> 2. Drop the use of .address field from the iio_chan_spec
> 3. Use iio_buffer_enabled call inside the lock
> 4. Drop wrapper function around iio_trigered_* function calls
> 5. Drop Kconfig select of sysfs trigger
> 6. Drop Kconfig select IIO_TRIGGER as it is already selected by
> IIO_TRIGGERED_BUFFER
>
> Changes since v1:
> 1. Use a fixed size buffer instead of kmalloc allocated during update
> scan mode
> 2. Remove a write to read only register ADC_HS (COCO bit)
>
> drivers/iio/adc/Kconfig | 2 +
> drivers/iio/adc/vf610_adc.c | 105 +++++++++++++++++++++++++++++++++++++++++---
> 2 files changed, 100 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 7c55658..660f790 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -337,6 +337,8 @@ config TWL6030_GPADC
> config VF610_ADC
> tristate "Freescale vf610 ADC driver"
> depends on OF
> + select IIO_BUFFER
> + select IIO_TRIGGERED_BUFFER
> help
> Say yes here to support for Vybrid board analog-to-digital converter.
> Since the IP is used for i.MX6SLX, the driver also support i.MX6SLX.
> diff --git a/drivers/iio/adc/vf610_adc.c b/drivers/iio/adc/vf610_adc.c
> index 23b8fb9..887a7ba 100644
> --- a/drivers/iio/adc/vf610_adc.c
> +++ b/drivers/iio/adc/vf610_adc.c
> @@ -34,8 +34,11 @@
> #include <linux/err.h>
>
> #include <linux/iio/iio.h>
> +#include <linux/iio/buffer.h>
> #include <linux/iio/sysfs.h>
> -#include <linux/iio/driver.h>
> +#include <linux/iio/trigger.h>
> +#include <linux/iio/trigger_consumer.h>
> +#include <linux/iio/triggered_buffer.h>
>
> /* This will be the driver name the kernel reports */
> #define DRIVER_NAME "vf610-adc"
> @@ -170,6 +173,7 @@ struct vf610_adc {
> u32 sample_freq_avail[5];
>
> struct completion completion;
> + u16 buffer[8];
> };
>
> static const u32 vf610_hw_avgs[] = { 1, 4, 8, 16, 32 };
> @@ -505,12 +509,24 @@ static const struct iio_chan_spec_ext_info vf610_ext_info[] = {
> .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
> BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> .ext_info = vf610_ext_info, \
> + .scan_index = (_idx), \
> + .scan_type = { \
> + .sign = 'u', \
> + .realbits = 12, \
> + .storagebits = 16, \
> + }, \
> }
>
> #define VF610_ADC_TEMPERATURE_CHAN(_idx, _chan_type) { \
> .type = (_chan_type), \
> .channel = (_idx), \
> .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
> + .scan_index = (_idx), \
> + .scan_type = { \
> + .sign = 'u', \
> + .realbits = 12, \
> + .storagebits = 16, \
> + }, \
> }
>
> static const struct iio_chan_spec vf610_adc_iio_channels[] = {
> @@ -531,6 +547,7 @@ static const struct iio_chan_spec vf610_adc_iio_channels[] = {
> VF610_ADC_CHAN(14, IIO_VOLTAGE),
> VF610_ADC_CHAN(15, IIO_VOLTAGE),
> VF610_ADC_TEMPERATURE_CHAN(26, IIO_TEMP),
> + IIO_CHAN_SOFT_TIMESTAMP(32),
> /* sentinel */
> };
>
> @@ -559,13 +576,20 @@ static int vf610_adc_read_data(struct vf610_adc *info)
>
> static irqreturn_t vf610_adc_isr(int irq, void *dev_id)
> {
> - struct vf610_adc *info = (struct vf610_adc *)dev_id;
> + struct iio_dev *indio_dev = (struct iio_dev *)dev_id;
> + struct vf610_adc *info = iio_priv(indio_dev);
> int coco;
>
> coco = readl(info->regs + VF610_REG_ADC_HS);
> if (coco & VF610_ADC_HS_COCO0) {
> info->value = vf610_adc_read_data(info);
> - complete(&info->completion);
> + if (iio_buffer_enabled(indio_dev)) {
> + info->buffer[0] = info->value;
> + iio_push_to_buffers_with_timestamp(indio_dev,
> + info->buffer, iio_get_time_ns());
> + iio_trigger_notify_done(indio_dev->trig);
> + } else
> + complete(&info->completion);
> }
>
> return IRQ_HANDLED;
> @@ -613,8 +637,12 @@ static int vf610_read_raw(struct iio_dev *indio_dev,
> case IIO_CHAN_INFO_RAW:
> case IIO_CHAN_INFO_PROCESSED:
> mutex_lock(&indio_dev->mlock);
> - reinit_completion(&info->completion);
> + if (iio_buffer_enabled(indio_dev)) {
> + mutex_unlock(&indio_dev->mlock);
> + return -EBUSY;
> + }
>
> + reinit_completion(&info->completion);
> hc_cfg = VF610_ADC_ADCHC(chan->channel);
> hc_cfg |= VF610_ADC_AIEN;
> writel(hc_cfg, info->regs + VF610_REG_ADC_HC0);
> @@ -694,6 +722,60 @@ static int vf610_write_raw(struct iio_dev *indio_dev,
> return -EINVAL;
> }
>
> +static int vf610_adc_buffer_postenable(struct iio_dev *indio_dev)
> +{
> + struct vf610_adc *info = iio_priv(indio_dev);
> + unsigned int channel;
> + int ret;
> + int val;
> +
> + ret = iio_triggered_buffer_postenable(indio_dev);
> + if (ret)
> + return ret;
> +
> + val = readl(info->regs + VF610_REG_ADC_GC);
> + val |= VF610_ADC_ADCON;
> + writel(val, info->regs + VF610_REG_ADC_GC);
> +
> + channel = find_first_bit(indio_dev->active_scan_mask,
> + indio_dev->masklength);
> +
> + val = VF610_ADC_ADCHC(channel);
> + val |= VF610_ADC_AIEN;
> +
> + writel(val, info->regs + VF610_REG_ADC_HC0);
> +
> + return 0;
> +}
> +
> +static int vf610_adc_buffer_predisable(struct iio_dev *indio_dev)
> +{
> + struct vf610_adc *info = iio_priv(indio_dev);
> + unsigned int hc_cfg = 0;
> + int val, ret;
> +
> + val = readl(info->regs + VF610_REG_ADC_GC);
> + val &= ~VF610_ADC_ADCON;
> + writel(val, info->regs + VF610_REG_ADC_GC);
> +
> + hc_cfg |= VF610_ADC_CONV_DISABLE;
> + hc_cfg &= ~VF610_ADC_AIEN;
> +
> + writel(hc_cfg, info->regs + VF610_REG_ADC_HC0);
> +
> + ret = iio_triggered_buffer_predisable(indio_dev);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +static const struct iio_buffer_setup_ops iio_triggered_buffer_setup_ops = {
> + .postenable = &vf610_adc_buffer_postenable,
> + .predisable = &vf610_adc_buffer_predisable,
> + .validate_scan_mask = &iio_validate_scan_mask_onehot,
> +};
> +
> static int vf610_adc_reg_access(struct iio_dev *indio_dev,
> unsigned reg, unsigned writeval,
> unsigned *readval)
> @@ -753,7 +835,7 @@ static int vf610_adc_probe(struct platform_device *pdev)
>
> ret = devm_request_irq(info->dev, irq,
> vf610_adc_isr, 0,
> - dev_name(&pdev->dev), info);
> + dev_name(&pdev->dev), indio_dev);
> if (ret < 0) {
> dev_err(&pdev->dev, "failed requesting irq, irq = %d\n", irq);
> return ret;
> @@ -806,15 +888,23 @@ static int vf610_adc_probe(struct platform_device *pdev)
> vf610_adc_cfg_init(info);
> vf610_adc_hw_init(info);
>
> + ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
> + NULL, &iio_triggered_buffer_setup_ops);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "Couldn't initialise the buffer\n");
> + goto error_iio_device_register;
> + }
> +
> ret = iio_device_register(indio_dev);
> if (ret) {
> dev_err(&pdev->dev, "Couldn't register the device.\n");
> - goto error_iio_device_register;
> + goto error_adc_buffer_init;
> }
>
> return 0;
>
> -
> +error_adc_buffer_init:
> + iio_triggered_buffer_cleanup(indio_dev);
> error_iio_device_register:
> clk_disable_unprepare(info->clk);
> error_adc_clk_enable:
> @@ -829,6 +919,7 @@ static int vf610_adc_remove(struct platform_device *pdev)
> struct vf610_adc *info = iio_priv(indio_dev);
>
> iio_device_unregister(indio_dev);
> + iio_triggered_buffer_cleanup(indio_dev);
> regulator_disable(info->vref);
> clk_disable_unprepare(info->clk);
>
> --
> 2.5.0
>
--
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