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Date: Fri, 14 Feb 2014 09:15:42 +0000
From: Laszlo Papp <lpapp@....org>
To: jdelvare@...e.de, linux@...ck-us.net
Cc: lm-sensors@...sensors.org, lee.jones@...aro.org, lpapp@....org,
linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] hwmon: (max6650) Convert to be a platform driver
The MFD driver has now been added, so this driver is now being adopted to be a
subdevice driver on top of it. This means, the i2c driver usage is being
converted to platform driver usage all around.
Signed-off-by: Laszlo Papp <lpapp@....org>
---
drivers/hwmon/Kconfig | 2 +-
drivers/hwmon/max6650.c | 125 ++++++++++++++++++++++++------------------------
2 files changed, 63 insertions(+), 64 deletions(-)
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 7ed3aa6..fcfe484 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -962,7 +962,7 @@ config SENSORS_MAX6642
config SENSORS_MAX6650
tristate "Maxim MAX6650 sensor chip"
- depends on I2C
+ depends on MFD_MAX665X
help
If you say yes here you get support for the MAX6650 / MAX6651
sensor chips.
diff --git a/drivers/hwmon/max6650.c b/drivers/hwmon/max6650.c
index 162a520..4d79413 100644
--- a/drivers/hwmon/max6650.c
+++ b/drivers/hwmon/max6650.c
@@ -39,6 +39,9 @@
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
+#include <linux/platform_device.h>
+
+#include <linux/mfd/max665x-private.h>
/*
* Insmod parameters
@@ -112,18 +115,19 @@ module_param(clock, int, S_IRUGO);
struct max6650_data {
struct i2c_client *client;
const struct attribute_group *groups[3];
+ struct max665x_dev *iodev;
struct mutex update_lock;
int nr_fans;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
/* register values */
- u8 speed;
- u8 config;
- u8 tach[4];
- u8 count;
- u8 dac;
- u8 alarm;
+ int speed;
+ int config;
+ int tach[4];
+ int count;
+ int dac;
+ int alarm;
};
static const u8 tach_reg[] = {
@@ -136,31 +140,29 @@ static const u8 tach_reg[] = {
static struct max6650_data *max6650_update_device(struct device *dev)
{
struct max6650_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
+ struct regmap *map = data->iodev->map;
int i;
+ int alarm;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
- data->speed = i2c_smbus_read_byte_data(client,
- MAX6650_REG_SPEED);
- data->config = i2c_smbus_read_byte_data(client,
- MAX6650_REG_CONFIG);
+ regmap_read(map, MAX6650_REG_SPEED, &data->speed);
+ regmap_read(map, MAX6650_REG_CONFIG, &data->config);
for (i = 0; i < data->nr_fans; i++) {
- data->tach[i] = i2c_smbus_read_byte_data(client,
- tach_reg[i]);
+ data->tach[i] = regmap_read(map, tach_reg[i],
+ &data->tach[i]);
}
- data->count = i2c_smbus_read_byte_data(client,
- MAX6650_REG_COUNT);
- data->dac = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC);
+ regmap_read(map, MAX6650_REG_COUNT, &data->count);
+ regmap_read(map, MAX6650_REG_DAC, &data->dac);
/*
* Alarms are cleared on read in case the condition that
* caused the alarm is removed. Keep the value latched here
* for providing the register through different alarm files.
*/
- data->alarm |= i2c_smbus_read_byte_data(client,
- MAX6650_REG_ALARM);
+ regmap_read(map, MAX6650_REG_ALARM, &alarm);
+ data->alarm |= alarm;
data->last_updated = jiffies;
data->valid = 1;
@@ -256,7 +258,6 @@ static ssize_t set_target(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
struct max6650_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
int kscale, ktach;
unsigned long rpm;
int err;
@@ -284,7 +285,7 @@ static ssize_t set_target(struct device *dev, struct device_attribute *devattr,
ktach = 255;
data->speed = ktach;
- i2c_smbus_write_byte_data(client, MAX6650_REG_SPEED, data->speed);
+ regmap_write(data->iodev->map, MAX6650_REG_SPEED, data->speed);
mutex_unlock(&data->update_lock);
@@ -325,7 +326,6 @@ static ssize_t set_pwm(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
struct max6650_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
unsigned long pwm;
int err;
@@ -342,7 +342,7 @@ static ssize_t set_pwm(struct device *dev, struct device_attribute *devattr,
else
data->dac = 76 - (76 * pwm)/255;
- i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac);
+ regmap_write(data->iodev->map, MAX6650_REG_DAC, data->dac);
mutex_unlock(&data->update_lock);
@@ -371,7 +371,7 @@ static ssize_t set_enable(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
struct max6650_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
+ struct regmap *map = data->iodev->map;
int max6650_modes[3] = {0, 3, 2};
unsigned long mode;
int err;
@@ -385,11 +385,11 @@ static ssize_t set_enable(struct device *dev, struct device_attribute *devattr,
mutex_lock(&data->update_lock);
- data->config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG);
+ regmap_read(map, MAX6650_REG_CONFIG, &data->config);
data->config = (data->config & ~MAX6650_CFG_MODE_MASK)
| (max6650_modes[mode] << 4);
- i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, data->config);
+ regmap_write(map, MAX6650_REG_CONFIG, data->config);
mutex_unlock(&data->update_lock);
@@ -421,7 +421,6 @@ static ssize_t set_div(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
struct max6650_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
unsigned long div;
int err;
@@ -448,7 +447,7 @@ static ssize_t set_div(struct device *dev, struct device_attribute *devattr,
return -EINVAL;
}
- i2c_smbus_write_byte_data(client, MAX6650_REG_COUNT, data->count);
+ regmap_write(data->iodev->map, MAX6650_REG_COUNT, data->count);
mutex_unlock(&data->update_lock);
return count;
@@ -465,16 +464,15 @@ static ssize_t get_alarm(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
- struct max6650_data *data = max6650_update_device(dev);
- struct i2c_client *client = data->client;
+ struct max6650_data *data = dev_get_drvdata(dev);
int alarm = 0;
if (data->alarm & attr->index) {
mutex_lock(&data->update_lock);
- alarm = 1;
data->alarm &= ~attr->index;
- data->alarm |= i2c_smbus_read_byte_data(client,
- MAX6650_REG_ALARM);
+ regmap_read(data->iodev->map, MAX6650_REG_ALARM, &alarm);
+ data->alarm |= alarm;
+ alarm = 1;
mutex_unlock(&data->update_lock);
}
@@ -505,10 +503,11 @@ static umode_t max6650_attrs_visible(struct kobject *kobj, struct attribute *a,
{
struct device *dev = container_of(kobj, struct device, kobj);
struct max6650_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
- u8 alarm_en = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN);
+ int alarm_en;
struct device_attribute *devattr;
+ regmap_read(data->iodev->map, MAX6650_REG_ALARM_EN, &alarm_en);
+
/*
* Hide the alarms that have not been enabled by the firmware
*/
@@ -560,17 +559,17 @@ static const struct attribute_group max6651_group = {
* Real code
*/
-static int max6650_init_client(struct max6650_data *data,
- struct i2c_client *client)
+static int max6650_init_client(struct platform_device *pdev)
{
- struct device *dev = &client->dev;
+ struct max6650_data *data = platform_get_drvdata(pdev);
+ struct regmap *map = data->iodev->map;
int config;
int err = -EIO;
- config = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG);
+ regmap_read(map, MAX6650_REG_CONFIG, &config);
if (config < 0) {
- dev_err(dev, "Error reading config, aborting.\n");
+ dev_err(&pdev->dev, "Error reading config, aborting.\n");
return err;
}
@@ -584,11 +583,11 @@ static int max6650_init_client(struct max6650_data *data,
config |= MAX6650_CFG_V12;
break;
default:
- dev_err(dev, "illegal value for fan_voltage (%d)\n",
+ dev_err(&pdev->dev, "illegal value for fan_voltage (%d)\n",
fan_voltage);
}
- dev_info(dev, "Fan voltage is set to %dV.\n",
+ dev_info(&pdev->dev, "Fan voltage is set to %dV.\n",
(config & MAX6650_CFG_V12) ? 12 : 5);
switch (prescaler) {
@@ -614,10 +613,11 @@ static int max6650_init_client(struct max6650_data *data,
| MAX6650_CFG_PRESCALER_16;
break;
default:
- dev_err(dev, "illegal value for prescaler (%d)\n", prescaler);
+ dev_err(&pdev->dev, "illegal value for prescaler (%d)\n",
+ prescaler);
}
- dev_info(dev, "Prescaler is set to %d.\n",
+ dev_info(&pdev->dev, "Prescaler is set to %d.\n",
1 << (config & MAX6650_CFG_PRESCALER_MASK));
/*
@@ -627,46 +627,45 @@ static int max6650_init_client(struct max6650_data *data,
*/
if ((config & MAX6650_CFG_MODE_MASK) == MAX6650_CFG_MODE_OFF) {
- dev_dbg(dev, "Change mode to open loop, full off.\n");
+ dev_dbg(&pdev->dev, "Change mode to open loop, full off.\n");
config = (config & ~MAX6650_CFG_MODE_MASK)
| MAX6650_CFG_MODE_OPEN_LOOP;
- if (i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, 255)) {
- dev_err(dev, "DAC write error, aborting.\n");
+ if (regmap_write(data->iodev->map, MAX6650_REG_DAC, 255) < 0) {
+ dev_err(&pdev->dev, "DAC write error, aborting.\n");
return err;
}
}
- if (i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, config)) {
- dev_err(dev, "Config write error, aborting.\n");
+ if (regmap_write(map, MAX6650_REG_CONFIG, config) < 0) {
+ dev_err(&pdev->dev, "Config write error, aborting.\n");
return err;
}
data->config = config;
- data->count = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT);
+ regmap_read(map, MAX6650_REG_COUNT, &data->count);
return 0;
}
-static int max6650_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
+static int max6650_probe(struct platform_device *pdev)
{
- struct device *dev = &client->dev;
- struct max6650_data *data;
+ struct max6650_data *data = platform_get_drvdata(pdev);
+ const struct platform_device_id *id = platform_get_device_id(pdev);
struct device *hwmon_dev;
int err;
- data = devm_kzalloc(dev, sizeof(struct max6650_data), GFP_KERNEL);
+ data = devm_kzalloc(&pdev->dev, sizeof(struct max6650_data),
+ GFP_KERNEL);
if (!data)
return -ENOMEM;
- data->client = client;
mutex_init(&data->update_lock);
data->nr_fans = id->driver_data;
/*
* Initialize the max6650 chip
*/
- err = max6650_init_client(data, client);
+ err = max6650_init_client(pdev);
if (err)
return err;
@@ -675,20 +674,20 @@ static int max6650_probe(struct i2c_client *client,
if (data->nr_fans == 4)
data->groups[1] = &max6651_group;
- hwmon_dev = devm_hwmon_device_register_with_groups(dev,
- client->name, data,
- data->groups);
+ hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
+ data->client->name,
+ data, data->groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
-static const struct i2c_device_id max6650_id[] = {
+static const struct platform_device_id max6650_id[] = {
{ "max6650", 1 },
{ "max6651", 4 },
{ }
};
-MODULE_DEVICE_TABLE(i2c, max6650_id);
+MODULE_DEVICE_TABLE(platform, max6650_id);
-static struct i2c_driver max6650_driver = {
+static struct platform_driver max6650_driver = {
.driver = {
.name = "max6650",
},
@@ -696,7 +695,7 @@ static struct i2c_driver max6650_driver = {
.id_table = max6650_id,
};
-module_i2c_driver(max6650_driver);
+module_platform_driver(max6650_driver);
MODULE_AUTHOR("Hans J. Koch");
MODULE_DESCRIPTION("MAX6650 sensor driver");
--
1.8.5.4
--
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