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Message-Id: <20210304105830.507176-1-kubernat@cesnet.cz>
Date: Thu, 4 Mar 2021 11:58:24 +0100
From: Václav Kubernát <kubernat@...net.cz>
To: unlisted-recipients:; (no To-header on input)
Cc: Václav Kubernát <kubernat@...net.cz>,
Jean Delvare <jdelvare@...e.com>,
Guenter Roeck <linux@...ck-us.net>,
Jonathan Corbet <corbet@....net>, linux-hwmon@...r.kernel.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/7] hwmon: (max31790) Rework to use regmap
Converting the driver to use regmap makes it more generic. It also makes
it a lot easier to debug through debugfs.
Signed-off-by: Václav Kubernát <kubernat@...net.cz>
---
drivers/hwmon/Kconfig | 1 +
drivers/hwmon/max31790.c | 148 +++++++++++++++++++++++++++------------
2 files changed, 105 insertions(+), 44 deletions(-)
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 54f04e61fb83..c2ec57672c4e 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1092,6 +1092,7 @@ config SENSORS_MAX6697
config SENSORS_MAX31790
tristate "Maxim MAX31790 sensor chip"
depends on I2C
+ select REGMAP_I2C
help
If you say yes here you get support for 6-Channel PWM-Output
Fan RPM Controller.
diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
index 86e6c71db685..ca413985b5f9 100644
--- a/drivers/hwmon/max31790.c
+++ b/drivers/hwmon/max31790.c
@@ -12,6 +12,7 @@
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/module.h>
+#include <linux/regmap.h>
#include <linux/slab.h>
/* MAX31790 registers */
@@ -46,11 +47,35 @@
#define NR_CHANNEL 6
+#define MAX31790_REG_USER_BYTE_67 0x67
+
+#define BULK_TO_U16(msb, lsb) (((msb) << 8) + (lsb))
+#define U16_MSB(num) (((num) & 0xFF00) >> 8)
+#define U16_LSB(num) ((num) & 0x00FF)
+
+static const struct regmap_range max31790_ro_range = {
+ .range_min = MAX31790_REG_TACH_COUNT(0),
+ .range_max = MAX31790_REG_PWMOUT(0) - 1,
+};
+
+static const struct regmap_access_table max31790_wr_table = {
+ .no_ranges = &max31790_ro_range,
+ .n_no_ranges = 1,
+};
+
+static const struct regmap_config max31790_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .reg_stride = 1,
+ .max_register = MAX31790_REG_USER_BYTE_67,
+ .wr_table = &max31790_wr_table,
+};
+
/*
* Client data (each client gets its own)
*/
struct max31790_data {
- struct i2c_client *client;
+ struct regmap *regmap;
struct mutex update_lock;
bool valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
@@ -67,53 +92,72 @@ struct max31790_data {
static struct max31790_data *max31790_update_device(struct device *dev)
{
struct max31790_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
+ struct regmap *regmap = data->regmap;
struct max31790_data *ret = data;
int i;
int rv;
+ int val;
+ u8 val_bulk[2];
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
- rv = i2c_smbus_read_byte_data(client,
- MAX31790_REG_FAN_FAULT_STATUS1);
+ rv = regmap_read(regmap,
+ MAX31790_REG_FAN_FAULT_STATUS1,
+ &val);
if (rv < 0)
goto abort;
- data->fault_status = rv & 0x3F;
+ data->fault_status = val & 0x3F;
- rv = i2c_smbus_read_byte_data(client,
- MAX31790_REG_FAN_FAULT_STATUS2);
+ rv = regmap_read(regmap,
+ MAX31790_REG_FAN_FAULT_STATUS2,
+ &val);
if (rv < 0)
goto abort;
- data->fault_status |= (rv & 0x3F) << 6;
+ data->fault_status |= (val & 0x3F) << 6;
for (i = 0; i < NR_CHANNEL; i++) {
- rv = i2c_smbus_read_word_swapped(client,
- MAX31790_REG_TACH_COUNT(i));
+ rv = regmap_bulk_read(regmap,
+ MAX31790_REG_TACH_COUNT(i),
+ val_bulk,
+ 2);
if (rv < 0)
goto abort;
- data->tach[i] = rv;
+ data->tach[i] = BULK_TO_U16(val_bulk[0],
+ val_bulk[1]);
if (data->fan_config[i]
& MAX31790_FAN_CFG_TACH_INPUT) {
- rv = i2c_smbus_read_word_swapped(client,
- MAX31790_REG_TACH_COUNT(NR_CHANNEL
- + i));
+ rv = regmap_bulk_read(regmap,
+ MAX31790_REG_TACH_COUNT(NR_CHANNEL
+ + i),
+ val_bulk,
+ 2);
if (rv < 0)
goto abort;
- data->tach[NR_CHANNEL + i] = rv;
+
+ data->tach[NR_CHANNEL + i] =
+ BULK_TO_U16(val_bulk[0],
+ val_bulk[1]);
} else {
- rv = i2c_smbus_read_word_swapped(client,
- MAX31790_REG_PWMOUT(i));
+ rv = regmap_bulk_read(regmap,
+ MAX31790_REG_PWMOUT(i),
+ val_bulk,
+ 2);
if (rv < 0)
goto abort;
- data->pwm[i] = rv;
+ data->pwm[i] = BULK_TO_U16(val_bulk[0],
+ val_bulk[1]);
- rv = i2c_smbus_read_word_swapped(client,
- MAX31790_REG_TARGET_COUNT(i));
+ rv = regmap_bulk_read(regmap,
+ MAX31790_REG_TARGET_COUNT(i),
+ val_bulk,
+ 2);
if (rv < 0)
goto abort;
- data->target_count[i] = rv;
+ data->target_count[i] =
+ BULK_TO_U16(val_bulk[0],
+ val_bulk[1]);
}
}
@@ -191,11 +235,12 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel,
long val)
{
struct max31790_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
+ struct regmap *regmap = data->regmap;
int target_count;
int err = 0;
u8 bits;
int sr;
+ u8 bulk_val[2];
mutex_lock(&data->update_lock);
@@ -207,9 +252,9 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel,
((data->fan_dynamics[channel] &
~MAX31790_FAN_DYN_SR_MASK) |
(bits << MAX31790_FAN_DYN_SR_SHIFT));
- err = i2c_smbus_write_byte_data(client,
- MAX31790_REG_FAN_DYNAMICS(channel),
- data->fan_dynamics[channel]);
+ err = regmap_write(regmap,
+ MAX31790_REG_FAN_DYNAMICS(channel),
+ data->fan_dynamics[channel]);
if (err < 0)
break;
@@ -218,10 +263,13 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel,
target_count = clamp_val(target_count, 0x1, 0x7FF);
data->target_count[channel] = target_count << 5;
+ bulk_val[0] = U16_MSB(data->target_count[channel]);
+ bulk_val[1] = U16_LSB(data->target_count[channel]);
- err = i2c_smbus_write_word_swapped(client,
+ err = regmap_bulk_write(regmap,
MAX31790_REG_TARGET_COUNT(channel),
- data->target_count[channel]);
+ bulk_val,
+ 2);
break;
default:
err = -EOPNOTSUPP;
@@ -287,9 +335,10 @@ static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
long val)
{
struct max31790_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
+ struct regmap *regmap = data->regmap;
u8 fan_config;
int err = 0;
+ u8 bulk_val[2];
mutex_lock(&data->update_lock);
@@ -300,9 +349,12 @@ static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
break;
}
data->pwm[channel] = val << 8;
- err = i2c_smbus_write_word_swapped(client,
- MAX31790_REG_PWMOUT(channel),
- data->pwm[channel]);
+ bulk_val[0] = U16_MSB(data->pwm[channel]);
+ bulk_val[1] = U16_LSB(data->pwm[channel]);
+ err = regmap_bulk_write(regmap,
+ MAX31790_REG_PWMOUT(channel),
+ bulk_val,
+ 2);
break;
case hwmon_pwm_enable:
fan_config = data->fan_config[channel];
@@ -321,9 +373,9 @@ static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
break;
}
data->fan_config[channel] = fan_config;
- err = i2c_smbus_write_byte_data(client,
- MAX31790_REG_FAN_CONFIG(channel),
- fan_config);
+ err = regmap_write(regmap,
+ MAX31790_REG_FAN_CONFIG(channel),
+ fan_config);
break;
default:
err = -EOPNOTSUPP;
@@ -426,23 +478,25 @@ static const struct hwmon_chip_info max31790_chip_info = {
.info = max31790_info,
};
-static int max31790_init_client(struct i2c_client *client,
+static int max31790_init_client(struct regmap *regmap,
struct max31790_data *data)
{
- int i, rv;
+ int i, rv, val;
for (i = 0; i < NR_CHANNEL; i++) {
- rv = i2c_smbus_read_byte_data(client,
- MAX31790_REG_FAN_CONFIG(i));
+ rv = regmap_read(regmap,
+ MAX31790_REG_FAN_CONFIG(i),
+ &val);
if (rv < 0)
return rv;
- data->fan_config[i] = rv;
+ data->fan_config[i] = val;
- rv = i2c_smbus_read_byte_data(client,
- MAX31790_REG_FAN_DYNAMICS(i));
+ rv = regmap_read(regmap,
+ MAX31790_REG_FAN_DYNAMICS(i),
+ &val);
if (rv < 0)
return rv;
- data->fan_dynamics[i] = rv;
+ data->fan_dynamics[i] = val;
}
return 0;
@@ -464,13 +518,19 @@ static int max31790_probe(struct i2c_client *client)
if (!data)
return -ENOMEM;
- data->client = client;
mutex_init(&data->update_lock);
+ data->regmap = devm_regmap_init_i2c(client, &max31790_regmap_config);
+
+ if (IS_ERR(data->regmap)) {
+ dev_err(dev, "failed to allocate register map\n");
+ return PTR_ERR(data->regmap);
+ }
+
/*
* Initialize the max31790 chip
*/
- err = max31790_init_client(client, data);
+ err = max31790_init_client(data->regmap, data);
if (err)
return err;
--
2.30.1
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