1 // SPDX-License-Identifier: GPL-2.0
3  * Generic battery driver using IIO
10 #include <linux/gpio/consumer.h>
18 #include <linux/iio/consumer.h>
19 #include <linux/iio/types.h>
21 #include <linux/devm-helpers.h>
62 	schedule_delayed_work(&adc_bat->bat_work, msecs_to_jiffies(0));  in gab_ext_power_changed()
71  * should correspond one-to-one with enum chan_type.
82 	if (!adc_bat->charge_finished)  in gab_charge_finished()
84 	return gpiod_get_value(adc_bat->charge_finished);  in gab_charge_finished()
92 	ret = iio_read_channel_processed(adc_bat->channel[channel], result);  in gab_read_channel()
94 		dev_err(&adc_bat->psy->dev, "read channel error: %d\n", ret);  in gab_read_channel()
108 		val->intval = adc_bat->status;  in gab_get_property()
111 		return gab_read_channel(adc_bat, GAB_VOLTAGE, &val->intval);  in gab_get_property()
113 		return gab_read_channel(adc_bat, GAB_CURRENT, &val->intval);  in gab_get_property()
115 		return gab_read_channel(adc_bat, GAB_POWER, &val->intval);  in gab_get_property()
117 		return gab_read_channel(adc_bat, GAB_TEMP, &val->intval);  in gab_get_property()
119 		return -EINVAL;  in gab_get_property()
131 	status = adc_bat->status;  in gab_work()
133 	if (!power_supply_am_i_supplied(adc_bat->psy))  in gab_work()
134 		adc_bat->status =  POWER_SUPPLY_STATUS_DISCHARGING;  in gab_work()
136 		adc_bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;  in gab_work()
138 		adc_bat->status = POWER_SUPPLY_STATUS_CHARGING;  in gab_work()
140 	if (status != adc_bat->status)  in gab_work()
141 		power_supply_changed(adc_bat->psy);  in gab_work()
148 	schedule_delayed_work(&adc_bat->bat_work,  in gab_charged()
165 	adc_bat = devm_kzalloc(&pdev->dev, sizeof(*adc_bat), GFP_KERNEL);  in gab_probe()
167 		return -ENOMEM;  in gab_probe()
169 	psy_cfg.of_node = pdev->dev.of_node;  in gab_probe()
171 	psy_desc = &adc_bat->psy_desc;  in gab_probe()
172 	psy_desc->name = dev_name(&pdev->dev);  in gab_probe()
175 	adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING;  in gab_probe()
176 	psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;  in gab_probe()
177 	psy_desc->get_property = gab_get_property;  in gab_probe()
178 	psy_desc->external_power_changed = gab_ext_power_changed;  in gab_probe()
184 	properties = devm_kcalloc(&pdev->dev,  in gab_probe()
190 		return -ENOMEM;  in gab_probe()
195 	 * getting channel from iio and copying the battery properties  in gab_probe()
196 	 * based on the channel supported by consumer device.  in gab_probe()
199 		adc_bat->channel[chan] = devm_iio_channel_get(&pdev->dev, gab_chan_name[chan]);  in gab_probe()
200 		if (IS_ERR(adc_bat->channel[chan])) {  in gab_probe()
201 			ret = PTR_ERR(adc_bat->channel[chan]);  in gab_probe()
202 			if (ret != -ENODEV)  in gab_probe()
203 				return dev_err_probe(&pdev->dev, ret, "Failed to get ADC channel %s\n", gab_chan_name[chan]);  in gab_probe()
204 			adc_bat->channel[chan] = NULL;  in gab_probe()
205 		} else if (adc_bat->channel[chan]) {  in gab_probe()
221 		return dev_err_probe(&pdev->dev, -ENODEV, "Failed to get any ADC channel\n");  in gab_probe()
229 	psy_desc->properties = properties;  in gab_probe()
230 	psy_desc->num_properties = index;  in gab_probe()
232 	adc_bat->psy = devm_power_supply_register(&pdev->dev, psy_desc, &psy_cfg);  in gab_probe()
233 	if (IS_ERR(adc_bat->psy))  in gab_probe()
234 …return dev_err_probe(&pdev->dev, PTR_ERR(adc_bat->psy), "Failed to register power-supply device\n"…  in gab_probe()
236 	ret = devm_delayed_work_autocancel(&pdev->dev, &adc_bat->bat_work, gab_work);  in gab_probe()
238 		return dev_err_probe(&pdev->dev, ret, "Failed to register delayed work\n");  in gab_probe()
240 	adc_bat->charge_finished = devm_gpiod_get_optional(&pdev->dev, "charged", GPIOD_IN);  in gab_probe()
241 	if (adc_bat->charge_finished) {  in gab_probe()
244 		irq = gpiod_to_irq(adc_bat->charge_finished);  in gab_probe()
245 		ret = devm_request_any_context_irq(&pdev->dev, irq, gab_charged,  in gab_probe()
249 			return dev_err_probe(&pdev->dev, ret, "Failed to register irq\n");  in gab_probe()
255 	schedule_delayed_work(&adc_bat->bat_work,  in gab_probe()
264 	cancel_delayed_work_sync(&adc_bat->bat_work);  in gab_suspend()
265 	adc_bat->status = POWER_SUPPLY_STATUS_UNKNOWN;  in gab_suspend()
274 	schedule_delayed_work(&adc_bat->bat_work,  in gab_resume()
283 	{ .compatible = "adc-battery" },
290 		.name	= "generic-adc-battery",
299 MODULE_DESCRIPTION("generic battery driver using IIO");