linux-kernel - Re: [PATCH 1/3] power_supply: modelgauge

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Message-ID: <52D66109.5080809@cogentembedded.com>
Date:	Wed, 15 Jan 2014 14:20:57 +0400
From:	Vladimir Barinov <vladimir.barinov@...entembedded.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
CC:	dwmw2@...radead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, anton@...msg.org, mk7.kang@...sung.com,
	kmpark@...radead.org
Subject: Re: [PATCH 1/3] power_supply: modelgauge_battery: Maxim ModelGauge
 ICs gauge

Hello, Krzysztof,

Thank you for the review.

On 01/14/2014 08:31 PM, Krzysztof Kozlowski wrote:
> On 01/09/2014 05:49 PM, Vladimir Barinov wrote:
>> Add Maxim ModelGauge ICs gauge driver for 
>> MAX17040/41/43/44/48/49/58/59 chips
>>
>> Signed-off-by: Vladimir Barinov 
>> <vladimir.barinov-M4DtvfQ/ZS1MRgGoP+s0PdBPR1lH4CV8@...lic.gmane.org>
>>
>> ---
>>   drivers/power/Kconfig                            |    8
>>   drivers/power/Makefile                           |    1
>>   drivers/power/modelgauge_battery.c               |  875 
>> +++++++++++++++++++++++
>>   include/linux/platform_data/battery-modelgauge.h |   44 +
>>   4 files changed, 928 insertions(+)
>>
>
> [...]
>
>> +static int modelgauge_read_reg(struct i2c_client *client, u8 reg, 
>> u16 *value)
>> +{
>> +    int ret = i2c_smbus_read_word_data(client, reg);
>> +
>> +    if (ret < 0) {
>> +        dev_err(&client->dev, "%s: err %d\n", __func__, ret);
>> +        return ret;
>> +    }
>> +
>> +    *value = be16_to_cpu(ret);
>> +    return 0;
>> +}
>
> Have you considered using regmap for accessing registers? I know that 
> other max17* drivers don't use it but it may be this could be the time 
> to switch to regmap API?
>
> [...]
Sure, I will rework for the next try. Thx for pointing to this.
>
>> +static int modelgauge_probe(struct i2c_client *client,
>> +                const struct i2c_device_id *id)
>> +{
>> +    struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
>> +    struct modelgauge_priv *priv;
>> +    int ret;
>> +
>> +    if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
>> +        return -EIO;
>> +
>> +    priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
>> +    if (!priv)
>> +        return -ENOMEM;
>> +
>> +    if (client->dev.of_node)
>> +        priv->pdata = modelgauge_parse_dt(&client->dev);
>> +    else
>> +        priv->pdata = client->dev.platform_data;
>> +
>> +    priv->client    = client;
>> +    priv->chip    = id->driver_data;
>> +
>> +    i2c_set_clientdata(client, priv);
>> +
>> +    priv->battery.name        = "modelgauge_battery";
>> +    priv->battery.type        = POWER_SUPPLY_TYPE_BATTERY;
>> +    priv->battery.get_property    = modelgauge_get_property;
>> +    priv->battery.properties    = modelgauge_battery_props;
>> +    priv->battery.num_properties    = 
>> ARRAY_SIZE(modelgauge_battery_props);
>> +
>> +    INIT_WORK(&priv->load_work, modelgauge_load_model_work);
>> +    INIT_DELAYED_WORK(&priv->rcomp_work, modelgauge_update_rcomp_work);
>> +
>> +    ret = modelgauge_init(priv);
>> +    if (ret)
>> +        return ret;
>> +
>> +    ret = power_supply_register(&client->dev, &priv->battery);
>> +    if (ret) {
>> +        dev_err(&client->dev, "failed: power supply register\n");
>> +        goto err_supply;
>> +    }
>> +
>> +    if (client->irq) {
>> +        switch (priv->chip) {
>> +        case ID_MAX17040:
>> +        case ID_MAX17041:
>> +            dev_err(&client->dev, "alert line is not supported\n");
>> +            ret = -EINVAL;
>> +            goto err_irq;
>> +        default:
>> +            ret = request_threaded_irq(client->irq, NULL,
>> +                           modelgauge_irq_handler,
>> +                           IRQF_TRIGGER_FALLING,
>> +                           priv->battery.name, priv);
>
> I think you may use devm_request_threaded_irq() here.
Ok, thx,
>
> Best regards,
> Krzysztof

Regards,
Vladimir
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