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hwmon: (pmbus) add a function to check the presence of a block register

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Other functions (like pmbus_check_byte_register) cannot be used to check
the presence of a block register, because it will generate error when PEC
is used.

Signed-off-by: Adam Wujek <dev_public@wujek.eu>
Link: https://lore.kernel.org/r/20220601013232.801133-1-dev_public@wujek.eu
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Adam Wujek 2022-06-01 01:33:03 +00:00 committed by Guenter Roeck
parent bae26b801f
commit 8a85007c83
1 changed files with 28 additions and 0 deletions
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28
drivers/hwmon/pmbus/pmbus_core.c
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@ -441,6 +441,18 @@ int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg,
}
EXPORT_SYMBOL_NS_GPL(pmbus_update_byte_data, PMBUS);
static int pmbus_read_block_data(struct i2c_client *client, int page, u8 reg,
char *data_buf)
{
int rv;
rv = pmbus_set_page(client, page, 0xff);
if (rv < 0)
return rv;
return i2c_smbus_read_block_data(client, reg, data_buf);
}
static struct pmbus_sensor *pmbus_find_sensor(struct pmbus_data *data, int page,
int reg)
{
@ -578,6 +590,22 @@ bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
}
EXPORT_SYMBOL_NS_GPL(pmbus_check_word_register, PMBUS);
static bool pmbus_check_block_register(struct i2c_client *client, int page,
int reg)
{
int rv;
struct pmbus_data *data = i2c_get_clientdata(client);
char data_buf[I2C_SMBUS_BLOCK_MAX + 2];
rv = pmbus_read_block_data(client, page, reg, data_buf);
if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
rv = pmbus_check_status_cml(client);
if (rv < 0 && (data->flags & PMBUS_READ_STATUS_AFTER_FAILED_CHECK))
data->read_status(client, -1);
pmbus_clear_fault_page(client, -1);
return rv >= 0;
}
const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
{
struct pmbus_data *data = i2c_get_clientdata(client);