linux-kernel - Re: [PATCH v4 3/4] hwmon: (pmbus/core): Add interrupt support

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Message-ID: <473d6a29-29cf-4b8a-b40b-d71fd8a5bcc8@roeck-us.net>
Date:   Sun, 12 Mar 2023 10:55:11 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Naresh Solanki <naresh.solanki@...ements.com>
Cc:     Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        Patrick Rudolph <patrick.rudolph@...ements.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/4] hwmon: (pmbus/core): Add interrupt support

On Wed, Mar 01, 2023 at 05:44:33PM +0100, Naresh Solanki wrote:
> From: Patrick Rudolph <patrick.rudolph@...ements.com>
> 
> Implement PMBUS irq handler.
> 
> Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
> Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
> ...

This should be "---"

Applied.

Thanks,
Guenter

> Changes in V4:
> - Clear fault using pmbus_clear_faults at end of interrupt handler.
> - Remove for loop.
> Changes in V3:
> - Remove pmbus word check for SMBALERT writes
> - Remove variable ret & use err instead.
> - Use dev_dbg_once instead of error.
> - Remove error print when writing to misc_status register.
> - Move client irq check to pmbus_irq_setup.
> ---
>  drivers/hwmon/pmbus/pmbus.h      |  2 +-
>  drivers/hwmon/pmbus/pmbus_core.c | 70 ++++++++++++++++++++++++++++++++
>  2 files changed, 71 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
> index 713ea7915425..11e84e141126 100644
> --- a/drivers/hwmon/pmbus/pmbus.h
> +++ b/drivers/hwmon/pmbus/pmbus.h
> @@ -26,7 +26,7 @@ enum pmbus_regs {
>  
>  	PMBUS_CAPABILITY		= 0x19,
>  	PMBUS_QUERY			= 0x1A,
> -
> +	PMBUS_SMBALERT_MASK		= 0x1B,
>  	PMBUS_VOUT_MODE			= 0x20,
>  	PMBUS_VOUT_COMMAND		= 0x21,
>  	PMBUS_VOUT_TRIM			= 0x22,
> diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
> index f8ac9016ea0e..dfd227459d8b 100644
> --- a/drivers/hwmon/pmbus/pmbus_core.c
> +++ b/drivers/hwmon/pmbus/pmbus_core.c
> @@ -3105,6 +3105,72 @@ static int pmbus_regulator_register(struct pmbus_data *data)
>  }
>  #endif
>  
> +static int pmbus_write_smbalert_mask(struct i2c_client *client, u8 page, u8 reg, u8 val)
> +{
> +	return pmbus_write_word_data(client, page, PMBUS_SMBALERT_MASK, reg | (val << 8));
> +}
> +
> +static irqreturn_t pmbus_fault_handler(int irq, void *pdata)
> +{
> +	struct pmbus_data *data = pdata;
> +	struct i2c_client *client = to_i2c_client(data->dev);
> +
> +	mutex_lock(&data->update_lock);
> +	/* TODO: Check status flag & notify hwmon events */
> +
> +	pmbus_clear_faults(client);
> +	mutex_unlock(&data->update_lock);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int pmbus_irq_setup(struct i2c_client *client, struct pmbus_data *data)
> +{
> +	struct device *dev = &client->dev;
> +	const struct pmbus_status_category *cat;
> +	const struct pmbus_status_assoc *bit;
> +	int i, j, err, func;
> +	u8 mask;
> +
> +	static const u8 misc_status[] = {PMBUS_STATUS_CML, PMBUS_STATUS_OTHER,
> +					 PMBUS_STATUS_MFR_SPECIFIC, PMBUS_STATUS_FAN_12,
> +					 PMBUS_STATUS_FAN_34};
> +
> +	if (!client->irq)
> +		return 0;
> +
> +	for (i = 0; i < data->info->pages; i++) {
> +		func = data->info->func[i];
> +
> +		for (j = 0; j < ARRAY_SIZE(pmbus_status_flag_map); j++) {
> +			cat = &pmbus_status_flag_map[j];
> +			if (!(func & cat->func))
> +				continue;
> +			mask = 0;
> +			for (bit = cat->bits; bit->pflag; bit++)
> +				mask |= bit->pflag;
> +
> +			err = pmbus_write_smbalert_mask(client, i, cat->reg, ~mask);
> +			if (err)
> +				dev_dbg_once(dev, "Failed to set smbalert for reg 0x%02x\n",
> +					     cat->reg);
> +		}
> +
> +		for (j = 0; j < ARRAY_SIZE(misc_status); j++)
> +			pmbus_write_smbalert_mask(client, i, misc_status[j], 0xff);
> +	}
> +
> +	/* Register notifiers */
> +	err = devm_request_threaded_irq(dev, client->irq, NULL, pmbus_fault_handler, 0,
> +					"pmbus-irq", data);
> +	if (err) {
> +		dev_err(dev, "failed to request an irq %d\n", err);
> +		return err;
> +	}
> +
> +	return 0;
> +}
> +
>  static struct dentry *pmbus_debugfs_dir;	/* pmbus debugfs directory */
>  
>  #if IS_ENABLED(CONFIG_DEBUG_FS)
> @@ -3467,6 +3533,10 @@ int pmbus_do_probe(struct i2c_client *client, struct pmbus_driver_info *info)
>  	if (ret)
>  		return ret;
>  
> +	ret = pmbus_irq_setup(client, data);
> +	if (ret)
> +		return ret;
> +
>  	ret = pmbus_init_debugfs(client, data);
>  	if (ret)
>  		dev_warn(dev, "Failed to register debugfs\n");