1 // SPDX-License-Identifier: GPL-2.0-only
3  * axp288_adc.c - X-Powers AXP288 PMIC ADC Driver
24  * This mask enables all ADCs except for the battery temp-sensor (TS), that is
25  * left as-is to avoid breaking charging on devices without a temp-sensor.
30 #define AXP288_ADC_TS_BIAS_MASK				GENMASK(5, 4)
98 		.channel = 5,
107 	IIO_MAP("TS_PIN", "axp288-batt", "axp288-batt-temp"),
108 	IIO_MAP("PMIC_TEMP", "axp288-pmic", "axp288-pmic-temp"),
109 	IIO_MAP("GPADC", "axp288-gpadc", "axp288-system-temp"),
110 	IIO_MAP("BATT_CHG_I", "axp288-chrg", "axp288-chrg-curr"),
111 	IIO_MAP("BATT_DISCHRG_I", "axp288-chrg", "axp288-chrg-d-curr"),
112 	IIO_MAP("BATT_V", "axp288-batt", "axp288-batt-volt"),
122 		return -EIO;  in axp288_adc_read_channel()
129  * The current-source used for the battery temp-sensor (TS) is shared
130  * with the GPADC. For proper fuel-gauge and charger operation the TS
131  * current-source needs to be permanently on. But to read the GPADC we
132  * need to temporary switch the TS current-source to ondemand, so that
140 	/* No need to switch the current-source if the TS pin is disabled */  in axp288_adc_set_ts()
141 	if (!info->ts_enabled)  in axp288_adc_set_ts()
148 	ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL,  in axp288_adc_set_ts()
167 	mutex_lock(&info->lock);  in axp288_adc_read_raw()
171 					chan->address)) {  in axp288_adc_read_raw()
172 			dev_err(&indio_dev->dev, "GPADC mode\n");  in axp288_adc_read_raw()
173 			ret = -EINVAL;  in axp288_adc_read_raw()
176 		ret = axp288_adc_read_channel(val, chan->address, info->regmap);  in axp288_adc_read_raw()
178 						chan->address))  in axp288_adc_read_raw()
179 			dev_err(&indio_dev->dev, "TS pin restore\n");  in axp288_adc_read_raw()
182 		ret = -EINVAL;  in axp288_adc_read_raw()
184 	mutex_unlock(&info->lock);  in axp288_adc_read_raw()
195 		/* Lenovo Ideapad 100S (11 inch) */
198 		  DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo ideapad 100S-11IBY"),
220 		ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL,  in axp288_adc_initialize()
222 					 (uintptr_t)bias_override->driver_data);  in axp288_adc_initialize()
228 	 * Determine if the TS pin is enabled and set the TS current-source  in axp288_adc_initialize()
231 	ret = regmap_read(info->regmap, AXP20X_ADC_EN1, &adc_enable_val);  in axp288_adc_initialize()
236 		info->ts_enabled = true;  in axp288_adc_initialize()
237 		ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL,  in axp288_adc_initialize()
241 		info->ts_enabled = false;  in axp288_adc_initialize()
242 		ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL,  in axp288_adc_initialize()
250 	return regmap_set_bits(info->regmap, AXP20X_ADC_EN1,  in axp288_adc_initialize()
263 	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);  in axp288_adc_probe()
265 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info));  in axp288_adc_probe()
267 		return -ENOMEM;  in axp288_adc_probe()
270 	info->irq = platform_get_irq(pdev, 0);  in axp288_adc_probe()
271 	if (info->irq < 0)  in axp288_adc_probe()
272 		return info->irq;  in axp288_adc_probe()
274 	info->regmap = axp20x->regmap;  in axp288_adc_probe()
281 		dev_err(&pdev->dev, "unable to enable ADC device\n");  in axp288_adc_probe()
285 	indio_dev->name = pdev->name;  in axp288_adc_probe()
286 	indio_dev->channels = axp288_adc_channels;  in axp288_adc_probe()
287 	indio_dev->num_channels = ARRAY_SIZE(axp288_adc_channels);  in axp288_adc_probe()
288 	indio_dev->info = &axp288_adc_iio_info;  in axp288_adc_probe()
289 	indio_dev->modes = INDIO_DIRECT_MODE;  in axp288_adc_probe()
291 	ret = devm_iio_map_array_register(&pdev->dev, indio_dev, axp288_adc_default_maps);  in axp288_adc_probe()
295 	mutex_init(&info->lock);  in axp288_adc_probe()
297 	return devm_iio_device_register(&pdev->dev, indio_dev);  in axp288_adc_probe()
318 MODULE_DESCRIPTION("X-Powers AXP288 ADC Driver");