lkml.org 
[lkml]   [2020]   [Jan]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v6 1/2] hwmon: (adt7475) Added attenuator bypass support
Date
Added support for reading DTS properties to set attenuators on
device probe for the ADT7473, ADT7475, ADT7476, and ADT7490.

Signed-off-by: Logan Shaw <logan.shaw@alliedtelesis.co.nz>
---
---
drivers/hwmon/adt7475.c | 55 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 55 insertions(+)

diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c
index 6c64d50c9aae..3f4bdc1eaaec 100644
--- a/drivers/hwmon/adt7475.c
+++ b/drivers/hwmon/adt7475.c
@@ -19,6 +19,7 @@
#include <linux/hwmon-vid.h>
#include <linux/err.h>
#include <linux/jiffies.h>
+#include <linux/of.h>
#include <linux/util_macros.h>

/* Indexes for the sysfs hooks */
@@ -1457,6 +1458,57 @@ static int adt7475_update_limits(struct i2c_client *client)
return 0;
}

+static void modify_config(const struct i2c_client *client, char *property,
+ u8 *config, u8 bit_index)
+{
+ u32 prop_value = 0;
+ int ret = of_property_read_u32(client->dev.of_node, property,
+ &prop_value);
+
+ if (!ret) {
+ if (prop_value)
+ *config |= (1 << bit_index);
+ else
+ *config &= ~(1 << bit_index);
+ }
+}
+
+static int load_attenuators(const struct i2c_client *client, int chip,
+ u8 *config2, u8 *config4)
+{
+ u8 conf_copy;
+ int ret;
+
+ if (chip == adt7476 || chip == adt7490) {
+ conf_copy = *config4;
+
+ modify_config(client, "bypass-attenuator-in0", &conf_copy, 4);
+ modify_config(client, "bypass-attenuator-in1", &conf_copy, 5);
+ modify_config(client, "bypass-attenuator-in3", &conf_copy, 6);
+ modify_config(client, "bypass-attenuator-in4", &conf_copy, 7);
+
+ ret = i2c_smbus_write_byte_data(client, REG_CONFIG4,
+ conf_copy);
+ if (ret < 0)
+ return ret;
+
+ *config4 = conf_copy;
+ } else if (chip == adt7473 || chip == adt7475) {
+ conf_copy = *config2;
+
+ modify_config(client, "bypass-attenuator-in1", &conf_copy, 5);
+
+ ret = i2c_smbus_write_byte_data(client, REG_CONFIG2,
+ conf_copy);
+ if (ret < 0)
+ return ret;
+
+ *config2 = conf_copy;
+ }
+
+ return 0;
+}
+
static int adt7475_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -1546,6 +1598,9 @@ static int adt7475_probe(struct i2c_client *client,

/* Voltage attenuators can be bypassed, globally or individually */
config2 = adt7475_read(REG_CONFIG2);
+ if (load_attenuators(client, chip, &config2, &data->config4) < 0)
+ dev_warn(&client->dev, "Error setting bypass attenuators\n");
+
if (config2 & CONFIG2_ATTN) {
data->bypass_attn = (0x3 << 3) | 0x3;
} else {
--
2.25.0
\
 
 \ /
  Last update: 2020-01-26 23:11    [W:0.077 / U:0.332 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site