summaryrefslogtreecommitdiff
path: root/drivers/hwmon/g762.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/hwmon/g762.c')
-rw-r--r--drivers/hwmon/g762.c125
1 files changed, 60 insertions, 65 deletions
diff --git a/drivers/hwmon/g762.c b/drivers/hwmon/g762.c
index 6d1208b2b6d2..4fa3aa1271da 100644
--- a/drivers/hwmon/g762.c
+++ b/drivers/hwmon/g762.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* g762 - Driver for the Global Mixed-mode Technology Inc. fan speed
* PWM controller chips from G762 family, i.e. G762 and G763
@@ -24,20 +25,6 @@
*
* g762: minimal datasheet available at:
* http://www.gmt.com.tw/product/datasheet/EDS-762_3.pdf
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation.
*/
#include <linux/device.h>
@@ -52,14 +39,14 @@
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/of.h>
-#include <linux/of_device.h>
#include <linux/platform_data/g762.h>
#define DRVNAME "g762"
static const struct i2c_device_id g762_id[] = {
- { "g762", 0 },
- { "g763", 0 },
+ { "g761" },
+ { "g762" },
+ { "g763" },
{ }
};
MODULE_DEVICE_TABLE(i2c, g762_id);
@@ -83,6 +70,7 @@ enum g762_regs {
#define G762_REG_FAN_CMD1_PWM_POLARITY 0x02 /* PWM polarity */
#define G762_REG_FAN_CMD1_PULSE_PER_REV 0x01 /* pulse per fan revolution */
+#define G761_REG_FAN_CMD2_FAN_CLOCK 0x20 /* choose internal clock*/
#define G762_REG_FAN_CMD2_GEAR_MODE_1 0x08 /* fan gear mode */
#define G762_REG_FAN_CMD2_GEAR_MODE_0 0x04
#define G762_REG_FAN_CMD2_FAN_STARTV_1 0x02 /* fan startup voltage */
@@ -128,8 +116,8 @@ enum g762_regs {
G762_REG_FAN_CMD2_GEAR_MODE_1)) >> 2))
struct g762_data {
- struct device *hwmon_dev;
struct i2c_client *client;
+ bool internal_clock;
struct clk *clk;
/* update mutex */
@@ -581,6 +569,7 @@ static int do_set_fan_startv(struct device *dev, unsigned long val)
#ifdef CONFIG_OF
static const struct of_device_id g762_dt_match[] = {
+ { .compatible = "gmt,g761" },
{ .compatible = "gmt,g762" },
{ .compatible = "gmt,g763" },
{ },
@@ -594,6 +583,14 @@ MODULE_DEVICE_TABLE(of, g762_dt_match);
* call to g762_of_clock_disable(). Note that a reference to clock is kept
* in our private data structure to be used in this function.
*/
+static void g762_of_clock_disable(void *data)
+{
+ struct g762_data *g762 = data;
+
+ clk_disable_unprepare(g762->clk);
+ clk_put(g762->clk);
+}
+
static int g762_of_clock_enable(struct i2c_client *client)
{
struct g762_data *data;
@@ -604,6 +601,21 @@ static int g762_of_clock_enable(struct i2c_client *client)
if (!client->dev.of_node)
return 0;
+ data = i2c_get_clientdata(client);
+
+ /*
+ * Skip CLK detection and handling if we use internal clock.
+ * This is only valid for g761.
+ */
+ data->internal_clock = of_device_is_compatible(client->dev.of_node,
+ "gmt,g761") &&
+ !of_property_present(client->dev.of_node,
+ "clocks");
+ if (data->internal_clock) {
+ do_set_clk_freq(&client->dev, 32768);
+ return 0;
+ }
+
clk = of_clk_get(client->dev.of_node, 0);
if (IS_ERR(clk)) {
dev_err(&client->dev, "failed to get clock\n");
@@ -623,9 +635,14 @@ static int g762_of_clock_enable(struct i2c_client *client)
goto clk_unprep;
}
- data = i2c_get_clientdata(client);
data->clk = clk;
+ ret = devm_add_action(&client->dev, g762_of_clock_disable, data);
+ if (ret) {
+ dev_err(&client->dev, "failed to add disable clock action\n");
+ goto clk_unprep;
+ }
+
return 0;
clk_unprep:
@@ -637,17 +654,6 @@ static int g762_of_clock_enable(struct i2c_client *client)
return ret;
}
-static void g762_of_clock_disable(struct i2c_client *client)
-{
- struct g762_data *data = i2c_get_clientdata(client);
-
- if (!data->clk)
- return;
-
- clk_disable_unprepare(data->clk);
- clk_put(data->clk);
-}
-
static int g762_of_prop_import_one(struct i2c_client *client,
const char *pname,
int (*psetter)(struct device *dev,
@@ -698,8 +704,6 @@ static int g762_of_clock_enable(struct i2c_client *client)
{
return 0;
}
-
-static void g762_of_clock_disable(struct i2c_client *client) { }
#endif
/*
@@ -1039,21 +1043,32 @@ ATTRIBUTE_GROUPS(g762);
static inline int g762_fan_init(struct device *dev)
{
struct g762_data *data = g762_update_client(dev);
+ int ret;
if (IS_ERR(data))
return PTR_ERR(data);
+ /* internal_clock can only be set with compatible g761 */
+ if (data->internal_clock)
+ data->fan_cmd2 |= G761_REG_FAN_CMD2_FAN_CLOCK;
+
data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_FAIL;
data->fan_cmd1 |= G762_REG_FAN_CMD1_DET_FAN_OOC;
data->valid = false;
- return i2c_smbus_write_byte_data(data->client, G762_REG_FAN_CMD1,
- data->fan_cmd1);
+ ret = i2c_smbus_write_byte_data(data->client, G762_REG_FAN_CMD1,
+ data->fan_cmd1);
+ if (ret)
+ return ret;
+
+ return i2c_smbus_write_byte_data(data->client, G762_REG_FAN_CMD2,
+ data->fan_cmd2);
}
-static int g762_probe(struct i2c_client *client, const struct i2c_device_id *id)
+static int g762_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
+ struct device *hwmon_dev;
struct g762_data *data;
int ret;
@@ -1069,46 +1084,27 @@ static int g762_probe(struct i2c_client *client, const struct i2c_device_id *id)
data->client = client;
mutex_init(&data->update_lock);
- /* Enable fan failure detection and fan out of control protection */
- ret = g762_fan_init(dev);
+ /* Get configuration via DT ... */
+ ret = g762_of_clock_enable(client);
if (ret)
return ret;
- /* Get configuration via DT ... */
- ret = g762_of_clock_enable(client);
+ /* Enable fan failure detection and fan out of control protection */
+ ret = g762_fan_init(dev);
if (ret)
return ret;
+
ret = g762_of_prop_import(client);
if (ret)
- goto clock_dis;
+ return ret;
/* ... or platform_data */
ret = g762_pdata_prop_import(client);
if (ret)
- goto clock_dis;
+ return ret;
- data->hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
+ hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
data, g762_groups);
- if (IS_ERR(data->hwmon_dev)) {
- ret = PTR_ERR(data->hwmon_dev);
- goto clock_dis;
- }
-
- return 0;
-
- clock_dis:
- g762_of_clock_disable(client);
-
- return ret;
-}
-
-static int g762_remove(struct i2c_client *client)
-{
- struct g762_data *data = i2c_get_clientdata(client);
-
- hwmon_device_unregister(data->hwmon_dev);
- g762_of_clock_disable(client);
-
- return 0;
+ return PTR_ERR_OR_ZERO(hwmon_dev);
}
static struct i2c_driver g762_driver = {
@@ -1116,8 +1112,7 @@ static struct i2c_driver g762_driver = {
.name = DRVNAME,
.of_match_table = of_match_ptr(g762_dt_match),
},
- .probe = g762_probe,
- .remove = g762_remove,
+ .probe = g762_probe,
.id_table = g762_id,
};
generated by cgit (git 2.34.1) at 2025-12-25 07:05:38 +0000