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Message-ID: <20221130182428.GB2658232@roeck-us.net>
Date: Wed, 30 Nov 2022 10:24:28 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Naresh Solanki <naresh.solanki@...ements.com>
Cc: devicetree@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
linux-hwmon@...r.kernel.org,
Patrick Rudolph <patrick.rudolph@...ements.com>
Subject: Re: [PATCH v3 3/4] hwmon: (pmbus/core): Implement irq support
On Wed, Nov 30, 2022 at 05:59:53PM +0100, Naresh Solanki wrote:
> From: Patrick Rudolph <patrick.rudolph@...ements.com>
>
> Implement PMBUS irq handler to notify regulator events.
>
There should be separate patches for adding irq support, adding
hwmon notifications, and adding regulator notifications. The order
should be:
- Add interrupt support
- Add hwmon notifications
- Add events to regulator flag map
- Add regulator notifications
Guenter
> Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
> Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
> ---
> drivers/hwmon/pmbus/pmbus.h | 2 +-
> drivers/hwmon/pmbus/pmbus_core.c | 151 ++++++++++++++++++++++++++++---
> 2 files changed, 137 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
> index 10fb17879f8e..6b2e6cf93b19 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 9a9e380acc23..613e2e484a0f 100644
> --- a/drivers/hwmon/pmbus/pmbus_core.c
> +++ b/drivers/hwmon/pmbus/pmbus_core.c
> @@ -81,6 +81,7 @@ struct pmbus_label {
> struct pmbus_data {
> struct device *dev;
> struct device *hwmon_dev;
> + struct regulator_dev **rdevs;
>
> u32 flags; /* from platform data */
>
> @@ -2804,7 +2805,8 @@ static const struct pmbus_regulator_status_category pmbus_regulator_flag_map[] =
> },
> };
>
> -static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
> +static int pmbus_regulator_get_flags(struct regulator_dev *rdev, unsigned int *error,
> + unsigned int *event)
> {
> int i, status;
> const struct pmbus_regulator_status_category *cat;
> @@ -2815,7 +2817,8 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
> u8 page = rdev_get_id(rdev);
> int func = data->info->func[page];
>
> - *flags = 0;
> + *error = 0;
> + *event = 0;
>
> mutex_lock(&data->update_lock);
>
> @@ -2831,8 +2834,10 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
> }
>
> for (bit = cat->bits; bit->pflag; bit++) {
> - if (status & bit->pflag)
> - *flags |= bit->rflag;
> + if (status & bit->pflag) {
> + *error |= bit->rflag;
> + *event |= bit->eflag;
> + }
> }
> }
>
> @@ -2851,11 +2856,15 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
> return status;
>
> if (pmbus_regulator_is_enabled(rdev)) {
> - if (status & PB_STATUS_OFF)
> - *flags |= REGULATOR_ERROR_FAIL;
> + if (status & PB_STATUS_OFF) {
> + *error |= REGULATOR_ERROR_FAIL;
> + *event |= REGULATOR_EVENT_FAIL;
> + }
>
> - if (status & PB_STATUS_POWER_GOOD_N)
> - *flags |= REGULATOR_ERROR_REGULATION_OUT;
> + if (status & PB_STATUS_POWER_GOOD_N) {
> + *error |= REGULATOR_ERROR_REGULATION_OUT;
> + *event |= REGULATOR_EVENT_REGULATION_OUT;
> + }
> }
>
> /*
> @@ -2863,13 +2872,22 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
> * PMBUS_STATUS_TEMPERATURE, map PB_STATUS_TEMPERATURE to a warning as
> * a (conservative) best-effort interpretation.
> */
> - if (!(*flags & (REGULATOR_ERROR_OVER_TEMP | REGULATOR_ERROR_OVER_TEMP_WARN)) &&
> - (status & PB_STATUS_TEMPERATURE))
> - *flags |= REGULATOR_ERROR_OVER_TEMP_WARN;
> + if (!(*error & (REGULATOR_ERROR_OVER_TEMP | REGULATOR_ERROR_OVER_TEMP_WARN)) &&
> + (status & PB_STATUS_TEMPERATURE)) {
> + *error |= REGULATOR_ERROR_OVER_TEMP_WARN;
> + *event |= REGULATOR_EVENT_OVER_TEMP_WARN;
> + }
>
> return 0;
> }
>
> +static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
> +{
> + unsigned int event;
> +
> + return pmbus_regulator_get_flags(rdev, flags, &event);
> +}
> +
> static int pmbus_regulator_get_status(struct regulator_dev *rdev)
> {
> struct device *dev = rdev_get_dev(rdev);
> @@ -3060,14 +3078,61 @@ const struct regulator_ops pmbus_regulator_ops = {
> };
> EXPORT_SYMBOL_NS_GPL(pmbus_regulator_ops, PMBUS);
>
> +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);
> + int i, ret = IRQ_NONE, status, event;
> + u8 page;
> +
> + for (i = 0; i < data->info->num_regulators; i++) {
> +
> + if (!data->rdevs[i])
> + continue;
> +
> + ret = pmbus_regulator_get_flags(data->rdevs[i], &status, &event);
> + if (ret)
> + return ret;
> +
> + if (event) {
> + regulator_notifier_call_chain(data->rdevs[i], event, NULL);
> + ret = IRQ_HANDLED;
> + }
> +
> + page = rdev_get_id(data->rdevs[i]);
> + mutex_lock(&data->update_lock);
> + status = pmbus_read_status_word(client, page);
> + if (status < 0) {
> + mutex_unlock(&data->update_lock);
> + return status;
> + }
> +
> + if (status & ~(PB_STATUS_OFF | PB_STATUS_BUSY | PB_STATUS_POWER_GOOD_N))
> + pmbus_clear_fault_page(client, page);
> +
> + mutex_unlock(&data->update_lock);
> + }
> +
> + return ret;
> +}
> +
> static int pmbus_regulator_register(struct pmbus_data *data)
> {
> struct device *dev = data->dev;
> const struct pmbus_driver_info *info = data->info;
> const struct pmbus_platform_data *pdata = dev_get_platdata(dev);
> - struct regulator_dev *rdev;
> int i;
>
> + data->rdevs = devm_kzalloc(dev, sizeof(struct regulator_dev *) * info->num_regulators,
> + GFP_KERNEL);
> + if (!data->rdevs)
> + return -ENOMEM;
> +
> for (i = 0; i < info->num_regulators; i++) {
> struct regulator_config config = { };
>
> @@ -3077,21 +3142,71 @@ static int pmbus_regulator_register(struct pmbus_data *data)
> if (pdata && pdata->reg_init_data)
> config.init_data = &pdata->reg_init_data[i];
>
> - rdev = devm_regulator_register(dev, &info->reg_desc[i],
> + data->rdevs[i] = devm_regulator_register(dev, &info->reg_desc[i],
> &config);
> - if (IS_ERR(rdev))
> - return dev_err_probe(dev, PTR_ERR(rdev),
> + if (IS_ERR(data->rdevs[i]))
> + return dev_err_probe(dev, PTR_ERR(data->rdevs[i]),
> "Failed to register %s regulator\n",
> info->reg_desc[i].name);
> }
>
> return 0;
> }
> +
> +static int pmbus_irq_setup(struct i2c_client *client, struct pmbus_data *data)
> +{
> + struct device *dev = &client->dev;
> + const struct pmbus_regulator_status_category *cat;
> + const struct pmbus_regulator_status_assoc *bit;
> + int i, j, err, ret;
> + u8 mask;
> + int func;
> +
> + for (i = 0; i < data->info->pages; i++) {
> + func = data->info->func[i];
> +
> + for (j = 0; j < ARRAY_SIZE(pmbus_regulator_flag_map); j++) {
> + cat = &pmbus_regulator_flag_map[i];
> + 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_err(dev, "Failed to set smbalert for reg 0x%02x\n", cat->reg);
> + }
> +
> + pmbus_write_smbalert_mask(client, i, PMBUS_STATUS_CML, 0xff);
> + pmbus_write_smbalert_mask(client, i, PMBUS_STATUS_OTHER, 0xff);
> + pmbus_write_smbalert_mask(client, i, PMBUS_STATUS_MFR_SPECIFIC, 0xff);
> + if (data->info->func[i] & PMBUS_HAVE_FAN12)
> + pmbus_write_smbalert_mask(client, i, PMBUS_STATUS_FAN_12, 0xff);
> + if (data->info->func[i] & PMBUS_HAVE_FAN34)
> + pmbus_write_smbalert_mask(client, i, PMBUS_STATUS_FAN_34, 0xff);
> +
> + }
> +
> + /* Register notifiers - can fail if IRQ is not given */
> + ret = devm_request_threaded_irq(dev, client->irq, NULL, pmbus_fault_handler,
> + 0, "pmbus-irq", data);
> + if (ret) {
> + dev_warn(dev, "IRQ disabled %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> #else
> static int pmbus_regulator_register(struct pmbus_data *data)
> {
> return 0;
> }
> +static int pmbus_irq_setup(struct i2c_client *client, struct pmbus_data *data)
> +{
> + return 0;
> +}
> #endif
>
> static struct dentry *pmbus_debugfs_dir; /* pmbus debugfs directory */
> @@ -3456,6 +3571,12 @@ int pmbus_do_probe(struct i2c_client *client, struct pmbus_driver_info *info)
> if (ret)
> return ret;
>
> + if (client->irq > 0) {
> + 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");
> --
> 2.37.3
>
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