diff options
| author | Guenter Roeck <linux@roeck-us.net> | 2015-01-16 10:12:50 -0800 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2015-02-02 08:20:06 -0800 |
| commit | 7f444bf0a28c030d40925c5d0073d3e5ed8ca1e3 (patch) | |
| tree | aabbf3a2c02fc0bf724d03bee8f84992f1d3fdf5 /drivers/hwmon/ads7828.c | |
| parent | bea0bab0fcf5a0b97f3545ba35647f0f37dc2475 (diff) | |
hwmon: (ads2828) Only keep data in device data structure if needed
The variables diff_input, ext_vref, and vref_mv are only used in the probe
function and therefore don't need to be kept in the device data structure.
Reviewed-and-Tested-by: Robert Rosengren <robert.rosengren@axis.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/ads7828.c')
| -rw-r--r-- | drivers/hwmon/ads7828.c | 32 |
1 files changed, 14 insertions, 18 deletions
diff --git a/drivers/hwmon/ads7828.c b/drivers/hwmon/ads7828.c index 071f779d5e4..bce4e9ff21b 100644 --- a/drivers/hwmon/ads7828.c +++ b/drivers/hwmon/ads7828.c @@ -49,9 +49,6 @@ enum ads7828_chips { ads7828, ads7830 }; /* Client specific data */ struct ads7828_data { struct regmap *regmap; - bool diff_input; /* Differential input */ - bool ext_vref; /* External voltage reference */ - unsigned int vref_mv; /* voltage reference value */ u8 cmd_byte; /* Command byte without channel bits */ unsigned int lsb_resol; /* Resolution of the ADC sample LSB */ }; @@ -120,39 +117,38 @@ static int ads7828_probe(struct i2c_client *client, struct ads7828_platform_data *pdata = dev_get_platdata(dev); struct ads7828_data *data; struct device *hwmon_dev; + unsigned int vref_mv = ADS7828_INT_VREF_MV; + bool diff_input = false; + bool ext_vref = false; data = devm_kzalloc(dev, sizeof(struct ads7828_data), GFP_KERNEL); if (!data) return -ENOMEM; if (pdata) { - data->diff_input = pdata->diff_input; - data->ext_vref = pdata->ext_vref; - if (data->ext_vref) - data->vref_mv = pdata->vref_mv; + diff_input = pdata->diff_input; + ext_vref = pdata->ext_vref; + if (ext_vref && pdata->vref_mv) + vref_mv = pdata->vref_mv; } - /* Bound Vref with min/max values if it was provided */ - if (data->vref_mv) - data->vref_mv = clamp_val(data->vref_mv, - ADS7828_EXT_VREF_MV_MIN, - ADS7828_EXT_VREF_MV_MAX); - else - data->vref_mv = ADS7828_INT_VREF_MV; + /* Bound Vref with min/max values */ + vref_mv = clamp_val(vref_mv, ADS7828_EXT_VREF_MV_MIN, + ADS7828_EXT_VREF_MV_MAX); /* ADS7828 uses 12-bit samples, while ADS7830 is 8-bit */ if (id->driver_data == ads7828) { - data->lsb_resol = DIV_ROUND_CLOSEST(data->vref_mv * 1000, 4096); + data->lsb_resol = DIV_ROUND_CLOSEST(vref_mv * 1000, 4096); data->regmap = devm_regmap_init_i2c(client, &ads2828_regmap_config); } else { - data->lsb_resol = DIV_ROUND_CLOSEST(data->vref_mv * 1000, 256); + data->lsb_resol = DIV_ROUND_CLOSEST(vref_mv * 1000, 256); data->regmap = devm_regmap_init_i2c(client, &ads2830_regmap_config); } - data->cmd_byte = data->ext_vref ? ADS7828_CMD_PD1 : ADS7828_CMD_PD3; - if (!data->diff_input) + data->cmd_byte = ext_vref ? ADS7828_CMD_PD1 : ADS7828_CMD_PD3; + if (!diff_input) data->cmd_byte |= ADS7828_CMD_SD_SE; hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |