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hwmon: (max6650) Read non-volatile registers only once 

Only tachometer and alarm status registers are modified by the chip.
All other registers only need to be read only once, and reading them
repeatedly does not add any value.

Cc: Jean-Francois Dagenais <jeff.dagenais@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2019-06-07 10:23:23 -07:00
parent e193acb3d6
commit 62dbe50591
1 changed files with 15 additions and 8 deletions
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23
drivers/hwmon/max6650.c
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@ -162,17 +162,10 @@ static struct max6650_data *max6650_update_device(struct device *dev)
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
data->speed = i2c_smbus_read_byte_data(client,
MAX6650_REG_SPEED);
data->config = i2c_smbus_read_byte_data(client,
MAX6650_REG_CONFIG);
for (i = 0; i < data->nr_fans; i++) {
data->tach[i] = i2c_smbus_read_byte_data(client,
tach_reg[i]);
}
data->count = i2c_smbus_read_byte_data(client,
MAX6650_REG_COUNT);
data->dac = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC);
/*
* Alarms are cleared on read in case the condition that
@ -421,8 +414,22 @@ static int max6650_init_client(struct max6650_data *data,
dev_err(dev, "Config write error, aborting.\n");
return err;
}
data->config = reg;
reg = i2c_smbus_read_byte_data(client, MAX6650_REG_SPEED);
if (reg < 0) {
dev_err(dev, "Failed to read speed register, aborting.\n");
return reg;
}
data->speed = reg;
reg = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC);
if (reg < 0) {
dev_err(dev, "Failed to read DAC register, aborting.\n");
return reg;
}
data->dac = reg;
reg = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT);
if (reg < 0) {
dev_err(dev, "Failed to read count register, aborting.\n");