[PATCH v3 18/30] iio: adc: sun4i-gpadc-iio: rework: support multiple sensors

Maxime Ripard
2018-08-31T09:05:56Z

On Thu, Aug 30, 2018 at 05:45:06PM +0200, Philipp Rossak wrote:
> For adding newer sensor some basic rework of the code is necessary.
>
> This patch reworks the driver to be able to handle more than one
> thermal sensor. Newer SoC like the A80 have 4 thermal sensors.
> Because of this the maximal sensor count value was set to 4.
>
> The sensor_id value is set during sensor registration and is for each
> registered sensor indiviual. This makes it able to differntiate the
> sensors when the value is read from the register.
>
> In function sun4i_gpadc_read_raw(), the sensor number of the ths sensor
> was directly set to 0 (sun4i_gpadc_temp_read(x,x,0)). This selects
> in the temp_read function automatically sensor 0. A check for the
> sensor_id is here not required since the old sensors only have one
> thermal sensor. In addition to that is the sun4i_gpadc_read_raw()
> function only used by the "older" sensors (before A33) where the
> thermal sensor was a cobination of an adc and a thermal sensor.
>
> Signed-off-by: Philipp Rossak <embed3d@gmail.com>
> ---
> drivers/iio/adc/sun4i-gpadc-iio.c | 63 +++++++++++++++++++++++++------------
> include/linux/iio/adc/sun4i-gpadc.h | 3 ++
> 2 files changed, 46 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/iio/adc/sun4i-gpadc-iio.c b/drivers/iio/adc/sun4i-gpadc-iio.c
> index c12de48c4e86..18ab72e52d78 100644
> --- a/drivers/iio/adc/sun4i-gpadc-iio.c
> +++ b/drivers/iio/adc/sun4i-gpadc-iio.c
> @@ -69,6 +69,7 @@ struct gpadc_data {
> bool has_bus_rst;
> bool has_mod_clk;
> u32 temp_data_base;
> + int sensor_count;
> };
>
> static irqreturn_t sun4i_gpadc_data_irq_handler(int irq, void *dev_id);
> @@ -84,6 +85,7 @@ static const struct gpadc_data sun4i_gpadc_data = {
> .ths_irq_thread = sun4i_gpadc_data_irq_handler,
> .support_irq = true,
> .temp_data_base = SUN4I_GPADC_TEMP_DATA,
> + .sensor_count = 1,
> };
>
> static const struct gpadc_data sun5i_gpadc_data = {
> @@ -97,6 +99,7 @@ static const struct gpadc_data sun5i_gpadc_data = {
> .ths_irq_thread = sun4i_gpadc_data_irq_handler,
> .support_irq = true,
> .temp_data_base = SUN4I_GPADC_TEMP_DATA,
> + .sensor_count = 1,
> };
>
> static const struct gpadc_data sun6i_gpadc_data = {
> @@ -110,6 +113,7 @@ static const struct gpadc_data sun6i_gpadc_data = {
> .ths_irq_thread = sun4i_gpadc_data_irq_handler,
> .support_irq = true,
> .temp_data_base = SUN4I_GPADC_TEMP_DATA,
> + .sensor_count = 1,
> };
>
> static const struct gpadc_data sun8i_a33_gpadc_data = {
> @@ -117,6 +121,13 @@ static const struct gpadc_data sun8i_a33_gpadc_data = {
> .temp_scale = 162,
> .tp_mode_en = SUN8I_A33_GPADC_CTRL1_CHOP_TEMP_EN,
> .temp_data_base = SUN4I_GPADC_TEMP_DATA,
> + .sensor_count = 1,
> +};
> +
> +struct sun4i_sensor_tzd {
> + struct sun4i_gpadc_iio *info;
> + struct thermal_zone_device *tzd;
> + unsigned int sensor_id;
> };
>
> struct sun4i_gpadc_iio {
> @@ -130,7 +141,7 @@ struct sun4i_gpadc_iio {
> const struct gpadc_data *data;
> /* prevents concurrent reads of temperature and ADC */
> struct mutex mutex;
> - struct thermal_zone_device *tzd;
> + struct sun4i_sensor_tzd tzds[MAX_SENSOR_COUNT];
> struct device *sensor_device;
> struct clk *bus_clk;
> struct clk *mod_clk;
> @@ -280,7 +291,8 @@ static int sun4i_gpadc_adc_read(struct iio_dev *indio_dev, int channel,
> SUN4I_GPADC_IRQ_FIFO_DATA);
> }
>
> -static int sun4i_gpadc_temp_read(struct iio_dev *indio_dev, int *val)
> +static int sun4i_gpadc_temp_read(struct iio_dev *indio_dev, int *val,
> + int sensor)
> {
> struct sun4i_gpadc_iio *info = iio_priv(indio_dev);
>
> @@ -290,7 +302,8 @@ static int sun4i_gpadc_temp_read(struct iio_dev *indio_dev, int *val)
>
> pm_runtime_get_sync(indio_dev->dev.parent);
>
> - regmap_read(info->regmap, info->data->temp_data_base, val);
> + regmap_read(info->regmap, info->data->temp_data_base + 0x4 * sensor,
> + val);
>
> pm_runtime_mark_last_busy(indio_dev->dev.parent);
> pm_runtime_put_autosuspend(indio_dev->dev.parent);
> @@ -334,7 +347,7 @@ static int sun4i_gpadc_read_raw(struct iio_dev *indio_dev,
> ret = sun4i_gpadc_adc_read(indio_dev, chan->channel,
> val);
> else
> - ret = sun4i_gpadc_temp_read(indio_dev, val);
> + ret = sun4i_gpadc_temp_read(indio_dev, val, 0);
>
> if (ret)
> return ret;
> @@ -420,10 +433,11 @@ static int sun4i_gpadc_runtime_resume(struct device *dev)
>
> static int sun4i_gpadc_get_temp(void *data, int *temp)
> {
> - struct sun4i_gpadc_iio *info = data;
> + struct sun4i_sensor_tzd *tzd = data;
> + struct sun4i_gpadc_iio *info = tzd->info;
> int val, scale, offset;
>
> - if (sun4i_gpadc_temp_read(info->indio_dev, &val))
> + if (sun4i_gpadc_temp_read(info->indio_dev, &val, tzd->sensor_id))
> return -ETIMEDOUT;
>
> sun4i_gpadc_temp_scale(info->indio_dev, &scale);
> @@ -569,7 +583,7 @@ static int sun4i_gpadc_probe(struct platform_device *pdev)
> {
> struct sun4i_gpadc_iio *info;
> struct iio_dev *indio_dev;
> - int ret;
> + int ret, i;
>
> indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info));
> if (!indio_dev)
> @@ -603,18 +617,24 @@ static int sun4i_gpadc_probe(struct platform_device *pdev)
> pm_runtime_set_suspended(&pdev->dev);
> pm_runtime_enable(&pdev->dev);
>
> - info->tzd = thermal_zone_of_sensor_register(info->sensor_device,
> - 0, info,
> - &sun4i_ts_tz_ops);
> - /*
> - * Do not fail driver probing when failing to register in
> - * thermal because no thermal DT node is found.
> - */
> - if (IS_ERR(info->tzd) && PTR_ERR(info->tzd) != -ENODEV) {
> - dev_err(&pdev->dev,
> - "could not register thermal sensor: %ld\n",
> - PTR_ERR(info->tzd));
> - return PTR_ERR(info->tzd);
> + for (i = 0; i < info->data->sensor_count; i++) {
> + info->tzds[i].info = info;
> + info->tzds[i].sensor_id = i;
> +
> + info->tzds[i].tzd = thermal_zone_of_sensor_register(

This isn't where should wrap your line.

> + info->sensor_device,
> + i, &info->tzds[i], &sun4i_ts_tz_ops);
> + /*
> + * Do not fail driver probing when failing to register in
> + * thermal because no thermal DT node is found.
> + */
> + if (IS_ERR(info->tzds[i].tzd) && \

And you don't need the \ here.

> + PTR_ERR(info->tzds[i].tzd) != -ENODEV) {
> + dev_err(&pdev->dev,
> + "could not register thermal sensor: %ld\n",
> + PTR_ERR(info->tzds[i].tzd));
> + return PTR_ERR(info->tzds[i].tzd);
> + }

If you're failing half way through the registration, you won't free
the first sensors registered.

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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