Re: [PATCH v3 21/30] iio: adc: sun4i-gpadc-iio: add support for H3 thermal sensor

Maxime Ripard
2018-08-31T09:11:42Z

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On Thu, Aug 30, 2018 at 05:45:09PM +0200, Philipp Rossak wrote:
> This patch adds support for the H3 ths sensor.
>
> The H3 supports interrupts. The interrupt is configured to update the
> the sensor values every second. The calibration data is writen at the
> begin of the init process.
>
> Signed-off-by: Philipp Rossak <embed3d@gmail.com>
> ---
> drivers/iio/adc/sun4i-gpadc-iio.c | 91 +++++++++++++++++++++++++++++++++++++
> include/linux/iio/adc/sun4i-gpadc.h | 18 ++++++++
> 2 files changed, 109 insertions(+)
>
> diff --git a/drivers/iio/adc/sun4i-gpadc-iio.c b/drivers/iio/adc/sun4i-gpadc-iio.c
> index c7b46c82e3e5..d5c7971b2558 100644
> --- a/drivers/iio/adc/sun4i-gpadc-iio.c
> +++ b/drivers/iio/adc/sun4i-gpadc-iio.c
> @@ -72,6 +72,7 @@ struct gpadc_data {
> u32 temp_data_base;
> int sensor_count;
> bool supports_nvmem;
> + u32 ths_irq_clear;
> };
>
> static irqreturn_t sun4i_gpadc_data_irq_handler(int irq, void *dev_id);
> @@ -79,6 +80,10 @@ static irqreturn_t sun4i_gpadc_data_irq_handler(int irq, void *dev_id);
> static int sun4i_ths_resume(struct sun4i_gpadc_iio *info);
> static int sun4i_ths_suspend(struct sun4i_gpadc_iio *info);
>
> +static int sun8i_h3_ths_resume(struct sun4i_gpadc_iio *info);
> +static int sun8i_h3_ths_suspend(struct sun4i_gpadc_iio *info);
> +static irqreturn_t sunx8i_h3_irq_thread(int irq, void *data);
> +
> static const struct gpadc_data sun4i_gpadc_data = {
> .temp_offset = -1932,
> .temp_scale = 133,
> @@ -137,6 +142,22 @@ static const struct gpadc_data sun8i_a33_gpadc_data = {
> .sensor_count = 1,
> };
>
> +static const struct gpadc_data sun8i_h3_ths_data = {
> + .temp_offset = -1791,
> + .temp_scale = -121,
> + .temp_data_base = SUN8I_H3_THS_TDATA0,
> + .ths_irq_thread = sunx8i_h3_irq_thread,
> + .support_irq = true,
> + .has_bus_clk = true,
> + .has_bus_rst = true,
> + .has_mod_clk = true,
> + .sensor_count = 1,
> + .supports_nvmem = true,
> + .ths_resume = sun8i_h3_ths_resume,
> + .ths_suspend = sun8i_h3_ths_suspend,
> + .ths_irq_clear = SUN8I_H3_THS_INTS_TDATA_IRQ_0,
> +};
> +
> struct sun4i_sensor_tzd {
> struct sun4i_gpadc_iio *info;
> struct thermal_zone_device *tzd;
> @@ -409,6 +430,31 @@ static irqreturn_t sun4i_gpadc_data_irq_handler(int irq, void *dev_id)
> return IRQ_HANDLED;
> }
>
> +static irqreturn_t sunx8i_h3_irq_thread(int irq, void *data)
> +{
> + struct sun4i_gpadc_iio *info = data;
> + int i;
> +
> + regmap_write(info->regmap, SUN8I_H3_THS_STAT,
> + info->data->ths_irq_clear);
> +
> + for (i = 0; i < info->data->sensor_count; i++)
> + thermal_zone_device_update(info->tzds[i].tzd,
> + THERMAL_EVENT_TEMP_SAMPLE);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int sun8i_h3_calibrate(struct sun4i_gpadc_iio *info)
> +{
> +// regmap_write(info->regmap, SUNXI_THS_CDATA_0_1,
> +// info->calibration_data[0]);
> +// regmap_write(info->regmap, SUNXI_THS_CDATA_2_3,
> +// info->calibration_data[1]);

Don't put commented code.

> +
> + return 0;
> +}
> +
> static int sun4i_gpadc_runtime_suspend(struct device *dev)
> {
> struct sun4i_gpadc_iio *info = iio_priv(dev_get_drvdata(dev));
> @@ -428,6 +474,16 @@ static int sun4i_ths_suspend(struct sun4i_gpadc_iio *info)
> return 0;
> }
>
> +static int sun8i_h3_ths_suspend(struct sun4i_gpadc_iio *info)
> +{
> + /* Disable ths interrupt */
> + regmap_write(info->regmap, SUN8I_H3_THS_INTC, 0x0);
> + /* Disable temperature sensor */
> + regmap_write(info->regmap, SUN8I_H3_THS_CTRL2, 0x0);
> +
> + return 0;
> +}
> +
> static int sun4i_gpadc_runtime_resume(struct device *dev)
> {
> struct sun4i_gpadc_iio *info = iio_priv(dev_get_drvdata(dev));
> @@ -454,6 +510,37 @@ static int sun4i_ths_resume(struct sun4i_gpadc_iio *info)
> return 0;
> }
>
> +static int sun8i_h3_ths_resume(struct sun4i_gpadc_iio *info)
> +{
> + u32 value;
> +
> + sun8i_h3_calibrate(info);
> +
> + regmap_write(info->regmap, SUN8I_H3_THS_CTRL0,
> + SUN4I_GPADC_CTRL0_T_ACQ(0xff));
> +
> + regmap_write(info->regmap, SUN8I_H3_THS_CTRL2,
> + SUN8I_H3_THS_ACQ1(0x3f));
> +
> + regmap_write(info->regmap, SUN8I_H3_THS_STAT,
> + SUN8I_H3_THS_INTS_TDATA_IRQ_0);
> +
> + regmap_write(info->regmap, SUN8I_H3_THS_FILTER,
> + SUN4I_GPADC_CTRL3_FILTER_EN |
> + SUN4I_GPADC_CTRL3_FILTER_TYPE(0x2));
> +
> + regmap_write(info->regmap, SUN8I_H3_THS_INTC,
> + SUN8I_H3_THS_INTC_TDATA_IRQ_EN0 |
> + SUN8I_H3_THS_TEMP_PERIOD(0x55));
> +
> + regmap_read(info->regmap, SUN8I_H3_THS_CTRL2, &value);
> +
> + regmap_write(info->regmap, SUN8I_H3_THS_CTRL2,
> + SUN8I_H3_THS_TEMP_SENSE_EN0 | value);

Ideally, all these values should have a comment explaining what they
are.

And we really start to have a lot of registers defines. We'd be better
off using regmap_fields.

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

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