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hwmon: (ads7828) Add OF device ID table

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The driver doesn't have a struct of_device_id table but supported devices
are registered via Device Trees. This is working on the assumption that a
I2C device registered via OF will always match a legacy I2C device ID and
that the MODALIAS reported will always be of the form i2c:<device>.

But this could change in the future so the correct approach is to have an
OF device ID table if the devices are registered via OF.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Javier Martinez Canillas 2017-02-24 10:12:57 -03:00 committed by Guenter Roeck
parent a140986fd0
commit 2d688f1413
1 changed files with 23 additions and 1 deletions
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24
drivers/hwmon/ads7828.c
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@ -31,6 +31,7 @@
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_data/ads7828.h>
#include <linux/regmap.h>
#include <linux/slab.h>
@ -121,6 +122,7 @@ static int ads7828_probe(struct i2c_client *client,
bool diff_input = false;
bool ext_vref = false;
unsigned int regval;
enum ads7828_chips chip;
data = devm_kzalloc(dev, sizeof(struct ads7828_data), GFP_KERNEL);
if (!data)
@ -133,12 +135,18 @@ static int ads7828_probe(struct i2c_client *client,
vref_mv = pdata->vref_mv;
}
if (client->dev.of_node)
chip = (enum ads7828_chips)
of_device_get_match_data(&client->dev);
else
chip = id->driver_data;
/* 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) {
if (chip == ads7828) {
data->lsb_resol = DIV_ROUND_CLOSEST(vref_mv * 1000, 4096);
data->regmap = devm_regmap_init_i2c(client,
&ads2828_regmap_config);
@ -177,9 +185,23 @@ static const struct i2c_device_id ads7828_device_ids[] = {
};
MODULE_DEVICE_TABLE(i2c, ads7828_device_ids);
static const struct of_device_id ads7828_of_match[] = {
{
.compatible = "ti,ads7828",
.data = (void *)ads7828
},
{
.compatible = "ti,ads7830",
.data = (void *)ads7830
},
{ },
};
MODULE_DEVICE_TABLE(of, ads7828_of_match);
static struct i2c_driver ads7828_driver = {
.driver = {
.name = "ads7828",
.of_match_table = of_match_ptr(ads7828_of_match),
},
.id_table = ads7828_device_ids,