1 // SPDX-License-Identifier: GPL-2.0-only
3  * axp288_adc.c - X-Powers AXP288 PMIC ADC Driver
23  * This mask enables all ADCs except for the battery temp-sensor (TS), that is
24  * left as-is to avoid breaking charging on devices without a temp-sensor.
104 	IIO_MAP("TS_PIN", "axp288-batt", "axp288-batt-temp"),
105 	IIO_MAP("PMIC_TEMP", "axp288-pmic", "axp288-pmic-temp"),
106 	IIO_MAP("GPADC", "axp288-gpadc", "axp288-system-temp"),
107 	IIO_MAP("BATT_CHG_I", "axp288-chrg", "axp288-chrg-curr"),
108 	IIO_MAP("BATT_DISCHRG_I", "axp288-chrg", "axp288-chrg-d-curr"),
109 	IIO_MAP("BATT_V", "axp288-batt", "axp288-batt-volt"),
119 		return -EIO;  in axp288_adc_read_channel()
126  * The current-source used for the battery temp-sensor (TS) is shared
127  * with the GPADC. For proper fuel-gauge and charger operation the TS
128  * current-source needs to be permanently on. But to read the GPADC we
129  * need to temporary switch the TS current-source to ondemand, so that
137 	/* No need to switch the current-source if the TS pin is disabled */  in axp288_adc_set_ts()
138 	if (!info->ts_enabled)  in axp288_adc_set_ts()
145 	ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL,  in axp288_adc_set_ts()
164 	mutex_lock(&indio_dev->mlock);  in axp288_adc_read_raw()
168 					chan->address)) {  in axp288_adc_read_raw()
169 			dev_err(&indio_dev->dev, "GPADC mode\n");  in axp288_adc_read_raw()
170 			ret = -EINVAL;  in axp288_adc_read_raw()
173 		ret = axp288_adc_read_channel(val, chan->address, info->regmap);  in axp288_adc_read_raw()
175 						chan->address))  in axp288_adc_read_raw()
176 			dev_err(&indio_dev->dev, "TS pin restore\n");  in axp288_adc_read_raw()
179 		ret = -EINVAL;  in axp288_adc_read_raw()
181 	mutex_unlock(&indio_dev->mlock);  in axp288_adc_read_raw()
195 		  DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo ideapad 100S-11IBY"),
209 		ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL,  in axp288_adc_initialize()
211 					 (uintptr_t)bias_override->driver_data);  in axp288_adc_initialize()
217 	 * Determine if the TS pin is enabled and set the TS current-source  in axp288_adc_initialize()
220 	ret = regmap_read(info->regmap, AXP20X_ADC_EN1, &adc_enable_val);  in axp288_adc_initialize()
225 		info->ts_enabled = true;  in axp288_adc_initialize()
226 		ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL,  in axp288_adc_initialize()
230 		info->ts_enabled = false;  in axp288_adc_initialize()
231 		ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL,  in axp288_adc_initialize()
239 	return regmap_update_bits(info->regmap, AXP20X_ADC_EN1,  in axp288_adc_initialize()
252 	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);  in axp288_adc_probe()
254 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info));  in axp288_adc_probe()
256 		return -ENOMEM;  in axp288_adc_probe()
259 	info->irq = platform_get_irq(pdev, 0);  in axp288_adc_probe()
260 	if (info->irq < 0)  in axp288_adc_probe()
261 		return info->irq;  in axp288_adc_probe()
263 	info->regmap = axp20x->regmap;  in axp288_adc_probe()
266 	 * otherwise internal fuel gauge functionality may be affected.  in axp288_adc_probe()
270 		dev_err(&pdev->dev, "unable to enable ADC device\n");  in axp288_adc_probe()
274 	indio_dev->name = pdev->name;  in axp288_adc_probe()
275 	indio_dev->channels = axp288_adc_channels;  in axp288_adc_probe()
276 	indio_dev->num_channels = ARRAY_SIZE(axp288_adc_channels);  in axp288_adc_probe()
277 	indio_dev->info = &axp288_adc_iio_info;  in axp288_adc_probe()
278 	indio_dev->modes = INDIO_DIRECT_MODE;  in axp288_adc_probe()
285 		dev_err(&pdev->dev, "unable to register iio device\n");  in axp288_adc_probe()
325 MODULE_DESCRIPTION("X-Powers AXP288 ADC Driver");