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hwmon: (pmbus/core) Add interrupt support

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Implement PMBUS irq handler.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Naresh Solanki <naresh.solanki@9elements.com>
Link: https://lore.kernel.org/r/20230301164434.1928237-3-Naresh.Solanki@9elements.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Patrick Rudolph 2023-03-01 17:44:33 +01:00 committed by Guenter Roeck
parent df5f6b6af0
commit 221819ca4c
2 changed files with 71 additions and 1 deletions
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2
drivers/hwmon/pmbus/pmbus.h
View file

@ -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,

70
drivers/hwmon/pmbus/pmbus_core.c
View file

@ -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");