Date:   Thu, 1 Oct 2020 01:47:25 +0200
From:   Sebastian Reichel <sre@...nel.org>
To:     Ricardo Rivera-Matos <r-rivera-matos@...com>
Cc:     robh+dt@...nel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        dmurphy@...com
Subject: Re: [PATCH v4 2/2] power: supply: bq256xx: Introduce the BQ256XX
 charger driver

Hi,

You are leaking some resources, otherwise LGTM.

On Wed, Sep 23, 2020 at 10:24:16AM -0500, Ricardo Rivera-Matos wrote:
> [...]
> +static int bq256xx_hw_init(struct bq256xx_device *bq)
> +{
> +	struct power_supply_battery_info bat_info = { };
> +	int wd_reg_val = BQ256XX_WATCHDOG_DIS;
> +	int ret = 0;
> +	int i;
> +
> +	for (i = 0; i < BQ256XX_NUM_WD_VAL; i++) {
> +		if (bq->watchdog_timer > bq256xx_watchdog_time[i] &&
> +		    bq->watchdog_timer < bq256xx_watchdog_time[i + 1])
> +			wd_reg_val = i;
> +	}
> +	ret = regmap_update_bits(bq->regmap, BQ256XX_CHARGER_CONTROL_1,
> +				 BQ256XX_WATCHDOG_MASK, wd_reg_val <<
> +						BQ256XX_WDT_BIT_SHIFT);
> +
> +	ret = power_supply_get_battery_info(bq->charger, &bat_info);
> +	if (ret) {
> +		dev_warn(bq->dev, "battery info missing, default values will be applied\n");
> +
> +		bat_info.constant_charge_current_max_ua =
> +				bq->chip_info->bq256xx_def_ichg;
> +
> +		bat_info.constant_charge_voltage_max_uv =
> +				bq->chip_info->bq256xx_def_vbatreg;
> +
> +		bat_info.precharge_current_ua =
> +				bq->chip_info->bq256xx_def_iprechg;
> +
> +		bat_info.charge_term_current_ua =
> +				bq->chip_info->bq256xx_def_iterm;
> +
> +		bq->init_data.ichg_max =
> +				bq->chip_info->bq256xx_max_ichg;
> +
> +		bq->init_data.vbatreg_max =
> +				bq->chip_info->bq256xx_max_vbatreg;
> +	} else {
> +		bq->init_data.ichg_max =
> +			bat_info.constant_charge_current_max_ua;
> +
> +		bq->init_data.vbatreg_max =
> +			bat_info.constant_charge_voltage_max_uv;
> +	}
> +
> +	ret = bq->chip_info->bq256xx_set_vindpm(bq, bq->init_data.vindpm);
> +	if (ret)
> +		goto err_out;
> +
> +	ret = bq->chip_info->bq256xx_set_iindpm(bq, bq->init_data.iindpm);
> +	if (ret)
> +		goto err_out;
> +
> +	ret = bq->chip_info->bq256xx_set_ichg(bq,
> +				bat_info.constant_charge_current_max_ua);
> +	if (ret)
> +		goto err_out;
> +
> +	ret = bq->chip_info->bq256xx_set_iprechg(bq,
> +				bat_info.precharge_current_ua);
> +	if (ret)
> +		goto err_out;
> +
> +	ret = bq->chip_info->bq256xx_set_vbatreg(bq,
> +				bat_info.constant_charge_voltage_max_uv);
> +	if (ret)
> +		goto err_out;
> +
> +	ret = bq->chip_info->bq256xx_set_iterm(bq,
> +				bat_info.charge_term_current_ua);
> +	if (ret)
> +		goto err_out;

You need to power_supply_put_battery_info().

> +
> +	return 0;
> +
> +err_out:
> +	return ret;
> +}
> +
> +static int bq256xx_parse_dt(struct bq256xx_device *bq)
> +{
> +	int ret = 0;
> +
> +	ret = device_property_read_u32(bq->dev, "ti,watchdog-timeout-ms",
> +				       &bq->watchdog_timer);
> +	if (ret)
> +		bq->watchdog_timer = BQ256XX_WATCHDOG_DIS;
> +
> +	if (bq->watchdog_timer > BQ256XX_WATCHDOG_MAX ||
> +	    bq->watchdog_timer < BQ256XX_WATCHDOG_DIS)
> +		return -EINVAL;
> +
> +	ret = device_property_read_u32(bq->dev,
> +				       "input-voltage-limit-microvolt",
> +				       &bq->init_data.vindpm);
> +	if (ret)
> +		bq->init_data.vindpm = bq->chip_info->bq256xx_def_vindpm;
> +
> +	ret = device_property_read_u32(bq->dev,
> +				       "input-current-limit-microamp",
> +				       &bq->init_data.iindpm);
> +	if (ret)
> +		bq->init_data.iindpm = bq->chip_info->bq256xx_def_iindpm;
> +
> +	return 0;
> +}
> +
> +static int bq256xx_probe(struct i2c_client *client,
> +			 const struct i2c_device_id *id)
> +{
> +	struct device *dev = &client->dev;
> +	struct bq256xx_device *bq;
> +	int ret;
> +
> +	bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL);
> +	if (!bq)
> +		return -ENOMEM;
> +
> +	bq->client = client;
> +	bq->dev = dev;
> +	bq->chip_info = &bq256xx_chip_info_tbl[id->driver_data];
> +
> +	mutex_init(&bq->lock);
> +
> +	strncpy(bq->model_name, id->name, I2C_NAME_SIZE);
> +
> +	bq->regmap = devm_regmap_init_i2c(client,
> +					bq->chip_info->bq256xx_regmap_config);
> +
> +	if (IS_ERR(bq->regmap)) {
> +		dev_err(dev, "Failed to allocate register map\n");
> +		return PTR_ERR(bq->regmap);
> +	}
> +
> +	i2c_set_clientdata(client, bq);
> +
> +	ret = bq256xx_parse_dt(bq);
> +	if (ret) {
> +		dev_err(dev, "Failed to read device tree properties%d\n", ret);
> +		return ret;
> +	}
> +
> +	/* OTG reporting */
> +	bq->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
> +	if (!IS_ERR_OR_NULL(bq->usb2_phy)) {
> +		INIT_WORK(&bq->usb_work, bq256xx_usb_work);
> +		bq->usb_nb.notifier_call = bq256xx_usb_notifier;
> +		usb_register_notifier(bq->usb2_phy, &bq->usb_nb);
> +	}
> +
> +	bq->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
> +	if (!IS_ERR_OR_NULL(bq->usb3_phy)) {
> +		INIT_WORK(&bq->usb_work, bq256xx_usb_work);
> +		bq->usb_nb.notifier_call = bq256xx_usb_notifier;
> +		usb_register_notifier(bq->usb3_phy, &bq->usb_nb);
> +	}
> +
> +	if (client->irq) {
> +		ret = devm_request_threaded_irq(dev, client->irq, NULL,
> +						bq256xx_irq_handler_thread,
> +						IRQF_TRIGGER_FALLING |
> +						IRQF_ONESHOT,
> +						dev_name(&client->dev), bq);
> +		if (ret)
> +			goto error_out;
> +	}
> +
> +	ret = bq256xx_power_supply_init(bq, dev);
> +	if (ret) {
> +		dev_err(dev, "Failed to register power supply\n");
> +		goto error_out;
> +	}
> +
> +	ret = bq256xx_hw_init(bq);
> +	if (ret) {
> +		dev_err(dev, "Cannot initialize the chip.\n");
> +		goto error_out;
> +	}
> +
> +	return ret;
> +
> +error_out:
> +	if (!IS_ERR_OR_NULL(bq->usb2_phy))
> +		usb_unregister_notifier(bq->usb2_phy, &bq->usb_nb);
> +
> +	if (!IS_ERR_OR_NULL(bq->usb3_phy))
> +		usb_unregister_notifier(bq->usb3_phy, &bq->usb_nb);
> +	return ret;

This also needs to be called during driver removal. Probably
it's best to do this via devm_add_action_or_reset().

> [...]

-- Sebastian

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