Allow the driver to work with device tree support.
Signed-off-by: Marcello Sylvester Bauer <[email protected]>
---
drivers/hwmon/max6639.c | 47 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/drivers/hwmon/max6639.c b/drivers/hwmon/max6639.c
index d733c35b5bcf..f84ee4a05f80 100644
--- a/drivers/hwmon/max6639.c
+++ b/drivers/hwmon/max6639.c
@@ -412,6 +412,38 @@ static int rpm_range_to_reg(int range)
return 1; /* default: 4000 RPM */
}
+static struct max6639_platform_data *get_pdata_from_dt_node(struct device *dev)
+{
+ struct max6639_platform_data *pdata;
+ u32 pol, ppr, rpm;
+ int ret;
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return ERR_PTR(-ENOMEM);
+
+ pdata->pwm_polarity = true;
+ ret = of_property_read_u32(dev->of_node, "polarity", &pol);
+ if (!ret && !pol)
+ pdata->pwm_polarity = false;
+
+ ret = of_property_read_u32(dev->of_node, "pulses-per-revolution", &ppr);
+ if (ret < 0)
+ dev_warn(dev, "No pulses-per-revolution property\n");
+ else
+ pdata->ppr = ppr;
+
+ ret = of_property_read_u32(dev->of_node, "rpm-range", &rpm);
+ if (ret < 0) {
+ dev_warn(dev, "no rpm-range property\n");
+ pdata->rpm_range = 4000;
+ } else {
+ pdata->rpm_range = rpm;
+ }
+
+ return pdata;
+}
+
static int max6639_init_client(struct i2c_client *client,
struct max6639_data *data)
{
@@ -421,6 +453,12 @@ static int max6639_init_client(struct i2c_client *client,
int rpm_range = 1; /* default: 4000 RPM */
int err;
+ if (!max6639_info && client->dev.of_node) {
+ max6639_info = get_pdata_from_dt_node(&client->dev);
+ if (IS_ERR(max6639_info))
+ return PTR_ERR(max6639_info);
+ }
+
/* Reset chip to default values, see below for GCONFIG setup */
err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
MAX6639_GCONFIG_POR);
@@ -631,6 +669,14 @@ static const struct i2c_device_id max6639_id[] = {
MODULE_DEVICE_TABLE(i2c, max6639_id);
+#ifdef CONFIG_OF
+static const struct of_device_id maxim_of_platform_match[] = {
+ {.compatible = "maxim,max6639"},
+ {},
+};
+MODULE_DEVICE_TABLE(of, maxim_of_platform_match);
+#endif
+
static SIMPLE_DEV_PM_OPS(max6639_pm_ops, max6639_suspend, max6639_resume);
static struct i2c_driver max6639_driver = {
@@ -638,6 +684,7 @@ static struct i2c_driver max6639_driver = {
.driver = {
.name = "max6639",
.pm = &max6639_pm_ops,
+ .of_match_table = of_match_ptr(maxim_of_platform_match),
},
.probe_new = max6639_probe,
.id_table = max6639_id,
--
2.33.1