Re: [PATCH 07/11] iio: adc: Add support for QCOM PMIC5 Gen3 ADC

[Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>]

On 08/07/2023 09:28, Jishnu Prakash wrote:
> The ADC architecture on PMIC5 Gen3 is similar to that on PMIC5 Gen2,
> with all SW communication to ADC going through PMK8550 which
> communicates with other PMICs through PBS. One major difference is
> that the register interface used here is that of an SDAM present on

...


> +static int adc5_gen3_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct iio_dev *indio_dev;
> +	struct adc5_chip *adc;
> +	struct regmap *regmap;
> +	int ret, i, irq;
> +	u32 *reg;
> +	char buf[20];
> +
> +	regmap = dev_get_regmap(dev->parent, NULL);
> +	if (!regmap)
> +		return -ENODEV;
> +
> +	indio_dev = devm_iio_device_alloc(dev, sizeof(*adc));
> +	if (!indio_dev)
> +		return -ENOMEM;
> +
> +	adc = iio_priv(indio_dev);
> +	adc->regmap = regmap;
> +	adc->dev = dev;
> +
> +	ret = device_property_count_u32(dev, "reg");
> +	if (ret < 0)
> +		return ret;
> +
> +	adc->num_sdams = ret;
> +
> +	reg = devm_kcalloc(dev, adc->num_sdams, sizeof(u32), GFP_KERNEL);
> +	if (!reg)
> +		return -ENOMEM;
> +
> +	ret = device_property_read_u32_array(dev, "reg", reg, adc->num_sdams);
> +	if (ret) {
> +		dev_err(adc->dev, "Failed to read reg property, ret=%d\n", ret);
> +		return ret;
> +	}
> +
> +	adc->base = devm_kcalloc(adc->dev, adc->num_sdams, sizeof(*adc->base), GFP_KERNEL);
> +	if (!adc->base)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < adc->num_sdams; i++) {
> +		adc->base[i].base_addr = reg[i];
> +
> +		irq = platform_get_irq(pdev, i);
> +		if (irq < 0) {
> +			dev_err(adc->dev, "Failed to get SDAM%d irq, ret=%d\n", i, irq);
> +			return irq;

return dev_err_probe

> +		}
> +		adc->base[i].irq = irq;
> +
> +		scnprintf(buf, sizeof(buf), "adc-sdam%d", i);
> +		adc->base[i].irq_name = devm_kstrdup(adc->dev, buf, GFP_KERNEL);
> +		if (!adc->base[i].irq_name)
> +			return -ENOMEM;
> +	}
> +
> +	platform_set_drvdata(pdev, adc);
> +
> +	init_completion(&adc->complete);
> +	mutex_init(&adc->lock);
> +
> +	ret = adc5_get_fw_data(adc);
> +	if (ret < 0) {
> +		dev_err(adc->dev, "adc get dt data failed, ret=%d\n", ret);

return dev_err_probe

> +		return ret;
> +	}
> +
> +	for (i = 0; i < adc->num_sdams; i++) {
> +		ret = devm_request_irq(dev, adc->base[i].irq, adc5_gen3_isr,
> +					0, adc->base[i].irq_name, adc);
> +		if (ret < 0) {
> +			dev_err(adc->dev, "Getting IRQ %d failed, ret=%d\n", adc->base[i].irq, ret);

return dev_err_probe

> +			return ret;
> +		}
> +	}
> +
> +	ret = adc_tm_register_tzd(adc);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (adc->n_tm_channels)
> +		INIT_WORK(&adc->tm_handler_work, tm_handler_work);
> +
> +	indio_dev->name = pdev->name;
> +	indio_dev->modes = INDIO_DIRECT_MODE;
> +	indio_dev->info = &adc5_gen3_info;
> +	indio_dev->channels = adc->iio_chans;
> +	indio_dev->num_channels = adc->nchannels;
> +
> +	return devm_iio_device_register(dev, indio_dev);
> +}
> +
> +static int adc5_gen3_exit(struct platform_device *pdev)
> +{
> +	struct adc5_chip *adc = platform_get_drvdata(pdev);
> +	u8 data = 0;
> +	int i, sdam_index;
> +
> +	mutex_lock(&adc->lock);
> +	/* Disable all available channels */
> +	for (i = 0; i < adc->num_sdams * 8; i++) {
> +		sdam_index = i / 8;
> +		data = MEAS_INT_DISABLE;
> +		adc5_gen3_write(adc, sdam_index, ADC5_GEN3_TIMER_SEL, &data, 1);
> +
> +		/* To indicate there is an actual conversion request */
> +		data = ADC5_GEN3_CHAN_CONV_REQ | (i - (sdam_index * 8));
> +		adc5_gen3_write(adc, sdam_index, ADC5_GEN3_PERPH_CH, &data, 1);
> +
> +		data = ADC5_GEN3_CONV_REQ_REQ;
> +		adc5_gen3_write(adc, sdam_index, ADC5_GEN3_CONV_REQ, &data, 1);
> +	}
> +
> +	mutex_unlock(&adc->lock);
> +
> +	if (adc->n_tm_channels)
> +		cancel_work_sync(&adc->tm_handler_work);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver adc5_gen3_driver = {
> +	.driver = {
> +		.name = "qcom-spmi-adc5-gen3",
> +		.of_match_table = adc5_match_table,
> +	},
> +	.probe = adc5_gen3_probe,
> +	.remove = adc5_gen3_exit,
> +};
> +module_platform_driver(adc5_gen3_driver);
> +
> +MODULE_ALIAS("platform:qcom-spmi-adc5-gen3");

Drop alias. If you need it, it means you screwed ID tables or your DTS.


Best regards,
Krzysztof