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Message-ID: <7a829bf2-c5f6-4234-a224-52328045f581@cherry.de>
Date: Mon, 1 Jul 2024 15:01:57 +0200
From: Quentin Schulz <quentin.schulz@...rry.de>
To: Guenter Roeck <linux@...ck-us.net>, linux-hwmon@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Farouk Bouabid <farouk.bouabid@...rry.de>
Subject: Re: [PATCH 09/10] hwmon: (amc6821) Convert to use regmap

Hi Guenter,

On 6/28/24 5:13 PM, Guenter Roeck wrote:
> Use regmap for register accesses and for most caching.
> 
> While at it, use sysfs_emit() instead of sprintf() to write sysfs
> attribute data.
> 
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>   drivers/hwmon/amc6821.c | 711 +++++++++++++++++++---------------------
>   1 file changed, 330 insertions(+), 381 deletions(-)
> 
> diff --git a/drivers/hwmon/amc6821.c b/drivers/hwmon/amc6821.c
> index ebffc9393c3d..6ffab4288134 100644
> --- a/drivers/hwmon/amc6821.c
> +++ b/drivers/hwmon/amc6821.c
> @@ -14,9 +14,9 @@
>   #include <linux/hwmon-sysfs.h>
>   #include <linux/i2c.h>
>   #include <linux/init.h>
> -#include <linux/jiffies.h>
>   #include <linux/module.h>
>   #include <linux/mutex.h>
> +#include <linux/regmap.h>
>   #include <linux/slab.h>
>   
>   /*
> @@ -44,6 +44,7 @@ module_param(init, int, 0444);
>   #define AMC6821_REG_CONF4		0x04
>   #define AMC6821_REG_STAT1		0x02
>   #define AMC6821_REG_STAT2		0x03
> +#define AMC6821_REG_TEMP_LO		0x06
>   #define AMC6821_REG_TDATA_LOW		0x08
>   #define AMC6821_REG_TDATA_HI		0x09
>   #define AMC6821_REG_LTEMP_HI		0x0A
> @@ -61,11 +62,8 @@ module_param(init, int, 0444);
>   #define AMC6821_REG_DCY_LOW_TEMP	0x21
>   
>   #define AMC6821_REG_TACH_LLIMITL	0x10
> -#define AMC6821_REG_TACH_LLIMITH	0x11
>   #define AMC6821_REG_TACH_HLIMITL	0x12
> -#define AMC6821_REG_TACH_HLIMITH	0x13
>   #define AMC6821_REG_TACH_SETTINGL	0x1e
> -#define AMC6821_REG_TACH_SETTINGH	0x1f
>   
>   #define AMC6821_CONF1_START		BIT(0)
>   #define AMC6821_CONF1_FAN_INT_EN	BIT(1)
> @@ -73,7 +71,7 @@ module_param(init, int, 0444);
>   #define AMC6821_CONF1_PWMINV		BIT(3)
>   #define AMC6821_CONF1_FAN_FAULT_EN	BIT(4)
>   #define AMC6821_CONF1_FDRC0		BIT(5)
> -#define AMC6821_CONF1_FDRC1		BIT(7)
> +#define AMC6821_CONF1_FDRC1		BIT(6)

This should have been squashed with a previous commit.

>   #define AMC6821_CONF1_THERMOVIE		BIT(7)
>   
>   #define AMC6821_CONF2_PWM_EN		BIT(0)
> @@ -130,224 +128,170 @@ static const u8 fan_reg_low[] = {AMC6821_REG_TDATA_LOW,
>   			AMC6821_REG_TACH_HLIMITL,
>   			AMC6821_REG_TACH_SETTINGL, };
>   
> -static const u8 fan_reg_hi[] = {AMC6821_REG_TDATA_HI,
> -			AMC6821_REG_TACH_LLIMITH,
> -			AMC6821_REG_TACH_HLIMITH,
> -			AMC6821_REG_TACH_SETTINGH, };
> -
>   /*
>    * Client data (each client gets its own)
>    */
>   
>   struct amc6821_data {
> -	struct i2c_client *client;
> +	struct regmap *regmap;
>   	struct mutex update_lock;
> -	bool valid; /* false until following fields are valid */
> -	unsigned long last_updated; /* in jiffies */
>   
> -	/* register values */
> -	int temp[TEMP_IDX_LEN];
> -
> -	u16 fan[FAN1_IDX_LEN];
> -	u8 fan1_pulses;
> -
> -	u8 pwm1;
>   	u8 temp1_auto_point_temp[3];
>   	u8 temp2_auto_point_temp[3];
> -	u8 pwm1_auto_point_pwm[3];
> -	u8 pwm1_enable;
> -	u8 pwm1_auto_channels_temp;
> -
> -	u8 stat1;
> -	u8 stat2;
>   };
>   
> -static struct amc6821_data *amc6821_update_device(struct device *dev)
> +static int amc6821_init_auto_point_data(struct amc6821_data *data)
>   {
> -	struct amc6821_data *data = dev_get_drvdata(dev);
> -	struct i2c_client *client = data->client;
> -	int timeout = HZ;
> -	u8 reg;
> -	int i;
> +	struct regmap *regmap = data->regmap;
> +	u32 pwm, regval;
> +	int err;
>   
> -	mutex_lock(&data->update_lock);
> +	err = regmap_read(regmap, AMC6821_REG_DCY_LOW_TEMP, &pwm);
> +	if (err)
> +		return err;
>   
> -	if (time_after(jiffies, data->last_updated + timeout) ||
> -			!data->valid) {
> +	err = regmap_read(regmap, AMC6821_REG_PSV_TEMP, &regval);
> +	if (err)
> +		return err;
> +	data->temp1_auto_point_temp[0] = regval;
> +	data->temp2_auto_point_temp[0] = data->temp1_auto_point_temp[0];
>   
> -		for (i = 0; i < TEMP_IDX_LEN; i++)
> -			data->temp[i] = (int8_t)i2c_smbus_read_byte_data(
> -				client, temp_reg[i]);
> +	err = regmap_read(regmap, AMC6821_REG_LTEMP_FAN_CTRL, &regval);
> +	if (err)
> +		return err;
> +	data->temp1_auto_point_temp[1] = (regval & 0xF8) >> 1;
>   
> -		data->stat1 = i2c_smbus_read_byte_data(client,
> -			AMC6821_REG_STAT1);
> -		data->stat2 = i2c_smbus_read_byte_data(client,
> -			AMC6821_REG_STAT2);
> +	regval &= 0x07;
> +	regval = 0x20 >> regval;
> +	if (regval)
> +		data->temp1_auto_point_temp[2] =
> +			data->temp1_auto_point_temp[1] +
> +			(255 - pwm) / regval;
> +	else
> +		data->temp1_auto_point_temp[2] = 255;
>   
> -		data->pwm1 = i2c_smbus_read_byte_data(client,
> -			AMC6821_REG_DCY);
> -		for (i = 0; i < FAN1_IDX_LEN; i++) {
> -			data->fan[i] = i2c_smbus_read_byte_data(
> -					client,
> -					fan_reg_low[i]);
> -			data->fan[i] += i2c_smbus_read_byte_data(
> -					client,
> -					fan_reg_hi[i]) << 8;
> -		}
> -		data->fan1_pulses = i2c_smbus_read_byte_data(client,
> -			AMC6821_REG_CONF4);
> -		data->fan1_pulses = data->fan1_pulses & AMC6821_CONF4_PSPR ? 4 : 2;
> +	err = regmap_read(regmap, AMC6821_REG_RTEMP_FAN_CTRL, &regval);
> +	if (err)
> +		return err;
>   
> -		data->pwm1_auto_point_pwm[0] = 0;
> -		data->pwm1_auto_point_pwm[2] = 255;
> -		data->pwm1_auto_point_pwm[1] = i2c_smbus_read_byte_data(client,
> -			AMC6821_REG_DCY_LOW_TEMP);
> +	data->temp2_auto_point_temp[1] = (regval & 0xF8) >> 1;
> +	regval &= 0x07;
> +	regval = 0x20 >> regval;
>   
> -		data->temp1_auto_point_temp[0] =
> -			i2c_smbus_read_byte_data(client,
> -					AMC6821_REG_PSV_TEMP);
> -		data->temp2_auto_point_temp[0] =
> -				data->temp1_auto_point_temp[0];
> -		reg = i2c_smbus_read_byte_data(client,
> -			AMC6821_REG_LTEMP_FAN_CTRL);
> -		data->temp1_auto_point_temp[1] = (reg & 0xF8) >> 1;
> -		reg &= 0x07;
> -		reg = 0x20 >> reg;
> -		if (reg > 0)
> -			data->temp1_auto_point_temp[2] =
> -				data->temp1_auto_point_temp[1] +
> -				(data->pwm1_auto_point_pwm[2] -
> -				data->pwm1_auto_point_pwm[1]) / reg;
> -		else
> -			data->temp1_auto_point_temp[2] = 255;
> +	if (regval)
> +		data->temp2_auto_point_temp[2] =
> +			data->temp2_auto_point_temp[1] +
> +			(255 - pwm) / regval;
> +	else
> +		data->temp2_auto_point_temp[2] = 255;
>   
> -		reg = i2c_smbus_read_byte_data(client,
> -			AMC6821_REG_RTEMP_FAN_CTRL);
> -		data->temp2_auto_point_temp[1] = (reg & 0xF8) >> 1;
> -		reg &= 0x07;
> -		reg = 0x20 >> reg;
> -		if (reg > 0)
> -			data->temp2_auto_point_temp[2] =
> -				data->temp2_auto_point_temp[1] +
> -				(data->pwm1_auto_point_pwm[2] -
> -				data->pwm1_auto_point_pwm[1]) / reg;
> -		else
> -			data->temp2_auto_point_temp[2] = 255;
> -
> -		reg = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
> -		reg = (reg >> 5) & 0x3;
> -		switch (reg) {
> -		case 0: /*open loop: software sets pwm1*/
> -			data->pwm1_auto_channels_temp = 0;
> -			data->pwm1_enable = 1;
> -			break;
> -		case 2: /*closed loop: remote T (temp2)*/
> -			data->pwm1_auto_channels_temp = 2;
> -			data->pwm1_enable = 2;
> -			break;
> -		case 3: /*closed loop: local and remote T (temp2)*/
> -			data->pwm1_auto_channels_temp = 3;
> -			data->pwm1_enable = 3;
> -			break;
> -		case 1: /*
> -			 * semi-open loop: software sets rpm, chip controls
> -			 * pwm1
> -			 */
> -			data->pwm1_auto_channels_temp = 0;
> -			data->pwm1_enable = 4;
> -			break;
> -		}
> -
> -		data->last_updated = jiffies;
> -		data->valid = true;
> -	}
> -	mutex_unlock(&data->update_lock);
> -	return data;
> +	return 0;
>   }
>   
>   static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
>   			 char *buf)
>   {
> -	struct amc6821_data *data = amc6821_update_device(dev);
> +	struct amc6821_data *data = dev_get_drvdata(dev);
>   	int ix = to_sensor_dev_attr(devattr)->index;
> +	u32 regval;

Why not a u8 directly here? We know single reads are going to return a 
u8 so no need to store more?

I'm not too fluent in type conversion, but maybe even an s8 since this 
is actually what's stored in the register?

> +	int err;
>   
> -	return sprintf(buf, "%d\n", data->temp[ix] * 1000);
> +	err = regmap_read(data->regmap, temp_reg[ix], &regval);
> +	if (err)
> +		return err;
> +
> +	return sysfs_emit(buf, "%d\n", (int8_t)regval * 1000);

The type casting choice is odd here. Considering we'll be printing an 
int and that 1000 cannot be stored in an int8_t, maybe just cast it to 
an int directly?

>   }
>   
>   static ssize_t temp_store(struct device *dev, struct device_attribute *attr,
>   			  const char *buf, size_t count)
>   {
>   	struct amc6821_data *data = dev_get_drvdata(dev);
> -	struct i2c_client *client = data->client;
>   	int ix = to_sensor_dev_attr(attr)->index;
>   	long val;
> +	int err;
>   
>   	int ret = kstrtol(buf, 10, &val);
>   	if (ret)
>   		return ret;
>   	val = clamp_val(val / 1000, -128, 127);
>   
> -	mutex_lock(&data->update_lock);
> -	data->temp[ix] = val;
> -	if (i2c_smbus_write_byte_data(client, temp_reg[ix], data->temp[ix])) {
> -		dev_err(&client->dev, "Register write error, aborting.\n");
> -		count = -EIO;
> -	}
> -	mutex_unlock(&data->update_lock);
> +	err = regmap_write(data->regmap, temp_reg[ix], val);
> +	if (err)
> +		return err;
> +
>   	return count;
>   }
>   
>   static ssize_t temp_alarm_show(struct device *dev,
>   			       struct device_attribute *devattr, char *buf)
>   {
> -	struct amc6821_data *data = amc6821_update_device(dev);
> +	struct amc6821_data *data = dev_get_drvdata(dev);
>   	int ix = to_sensor_dev_attr(devattr)->index;
> -	u8 flag;
> +	u32 regval, mask, reg;

Why not u8 for regval?

> +	int err;
>   
>   	switch (ix) {
>   	case IDX_TEMP1_MIN:
> -		flag = data->stat1 & AMC6821_STAT1_LTL;
> +		reg = AMC6821_REG_STAT1;
> +		mask = AMC6821_STAT1_LTL;
>   		break;
>   	case IDX_TEMP1_MAX:
> -		flag = data->stat1 & AMC6821_STAT1_LTH;
> +		reg = AMC6821_REG_STAT1;
> +		mask = AMC6821_STAT1_LTH;
>   		break;
>   	case IDX_TEMP1_CRIT:
> -		flag = data->stat2 & AMC6821_STAT2_LTC;
> +		reg = AMC6821_REG_STAT2;
> +		mask = AMC6821_STAT2_LTC;
>   		break;
>   	case IDX_TEMP2_MIN:
> -		flag = data->stat1 & AMC6821_STAT1_RTL;
> +		reg = AMC6821_REG_STAT1;
> +		mask = AMC6821_STAT1_RTL;
>   		break;
>   	case IDX_TEMP2_MAX:
> -		flag = data->stat1 & AMC6821_STAT1_RTH;
> +		reg = AMC6821_REG_STAT1;
> +		mask = AMC6821_STAT1_RTH;
>   		break;
>   	case IDX_TEMP2_CRIT:
> -		flag = data->stat2 & AMC6821_STAT2_RTC;
> +		reg = AMC6821_REG_STAT2;
> +		mask = AMC6821_STAT2_RTC;
>   		break;
>   	default:
>   		dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
>   		return -EINVAL;
>   	}
> -	if (flag)
> -		return sprintf(buf, "1");
> -	else
> -		return sprintf(buf, "0");
> +	err = regmap_read(data->regmap, reg, &regval);
> +	if (err)
> +		return err;
> +	return sysfs_emit(buf, "%d\n", !!(regval & mask));
>   }
>   
>   static ssize_t temp2_fault_show(struct device *dev,
>   				struct device_attribute *devattr, char *buf)
>   {
> -	struct amc6821_data *data = amc6821_update_device(dev);
> -	if (data->stat1 & AMC6821_STAT1_RTF)
> -		return sprintf(buf, "1");
> -	else
> -		return sprintf(buf, "0");
> +	struct amc6821_data *data = dev_get_drvdata(dev);
> +	u32 regval;

Ditto.

> +	int err;
> +
> +	err = regmap_read(data->regmap, AMC6821_REG_STAT1, &regval);
> +	if (err)
> +		return err;
> +
> +	return sysfs_emit(buf, "%d\n", !!(regval & AMC6821_STAT1_RTF));
>   }
>   
>   static ssize_t pwm1_show(struct device *dev, struct device_attribute *devattr,
>   			 char *buf)
>   {
> -	struct amc6821_data *data = amc6821_update_device(dev);
> -	return sprintf(buf, "%d\n", data->pwm1);
> +	struct amc6821_data *data = dev_get_drvdata(dev);
> +	u32 regval;

Ditto.

> +	int err;
> +
> +	err = regmap_read(data->regmap, AMC6821_REG_DCY, &regval);
> +	if (err)
> +		return err;
> +
> +	return sysfs_emit(buf, "%d\n", regval);
>   }
>   
>   static ssize_t pwm1_store(struct device *dev,
> @@ -355,7 +299,6 @@ static ssize_t pwm1_store(struct device *dev,
>   			  size_t count)
>   {
>   	struct amc6821_data *data = dev_get_drvdata(dev);
> -	struct i2c_client *client = data->client;
>   	long val;
>   	int ret = kstrtol(buf, 10, &val);
>   	if (ret)
> @@ -364,18 +307,38 @@ static ssize_t pwm1_store(struct device *dev,
>   	if (val < 0 || val > 255)
>   		return -EINVAL;
>   
> -	mutex_lock(&data->update_lock);
> -	data->pwm1 = val;
> -	i2c_smbus_write_byte_data(client, AMC6821_REG_DCY, data->pwm1);
> -	mutex_unlock(&data->update_lock);
> +	ret = regmap_write(data->regmap, AMC6821_REG_DCY, val);
> +	if (ret)
> +		return ret;
> +
>   	return count;
>   }
>   
>   static ssize_t pwm1_enable_show(struct device *dev,
>   				struct device_attribute *devattr, char *buf)
>   {
> -	struct amc6821_data *data = amc6821_update_device(dev);
> -	return sprintf(buf, "%d\n", data->pwm1_enable);
> +	struct amc6821_data *data = dev_get_drvdata(dev);
> +	int err;
> +	u32 val;

Ditto.

> +
> +	err = regmap_read(data->regmap, AMC6821_REG_CONF1, &val);
> +	if (err)
> +		return err;
> +	switch (val & (AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1)) {
> +	case 0:
> +		val = 1;	/* manual */
> +		break;
> +	case AMC6821_CONF1_FDRC0:
> +		val = 4;	/* target rpm (fan1_target) controlled */
> +		break;
> +	case AMC6821_CONF1_FDRC1:
> +		val = 2;	/* remote temp controlled */
> +		break;
> +	default:
> +		val = 3;	/* max(local, remote) temp controlled */
> +		break;
> +	}
> +	return sysfs_emit(buf, "%d\n", val);
>   }
>   
>   static ssize_t pwm1_enable_store(struct device *dev,
> @@ -383,49 +346,37 @@ static ssize_t pwm1_enable_store(struct device *dev,
>   				 const char *buf, size_t count)
>   {
>   	struct amc6821_data *data = dev_get_drvdata(dev);
> -	struct i2c_client *client = data->client;
>   	long val;
> -	int config = kstrtol(buf, 10, &val);
> -	if (config)
> -		return config;
> +	u32 mask;

Please rename to something else, e.g. val, as this is NOT used as a mask 
but rather the value to write in the masked bitfield (which is hardcoded 
to AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1.

> +	int err;
>   
> -	mutex_lock(&data->update_lock);
> -	config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
> -	if (config < 0) {
> -			dev_err(&client->dev,
> -			"Error reading configuration register, aborting.\n");
> -			count = config;
> -			goto unlock;
> -	}
> +	err = kstrtol(buf, 10, &val);
> +	if (err)
> +		return err;
>   
>   	switch (val) {
>   	case 1:
> -		config &= ~AMC6821_CONF1_FDRC0;
> -		config &= ~AMC6821_CONF1_FDRC1;
> +		mask = 0;
>   		break;
>   	case 2:
> -		config &= ~AMC6821_CONF1_FDRC0;
> -		config |= AMC6821_CONF1_FDRC1;
> +		mask = AMC6821_CONF1_FDRC1;
>   		break;
>   	case 3:
> -		config |= AMC6821_CONF1_FDRC0;
> -		config |= AMC6821_CONF1_FDRC1;
> +		mask = AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1;
>   		break;
>   	case 4:
> -		config |= AMC6821_CONF1_FDRC0;
> -		config &= ~AMC6821_CONF1_FDRC1;
> +		mask = AMC6821_CONF1_FDRC0;
>   		break;
>   	default:
> -		count = -EINVAL;
> -		goto unlock;
> +		return -EINVAL;
>   	}
> -	if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF1, config)) {
> -			dev_err(&client->dev,
> -			"Configuration register write error, aborting.\n");
> -			count = -EIO;
> -	}
> -unlock:
> -	mutex_unlock(&data->update_lock);
> +
> +	err = regmap_update_bits(data->regmap, AMC6821_REG_CONF1,
> +				 AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1,
> +				 mask);
> +	if (err < 0)

Shouldn't we check for err != 0 (so err) instead to be consistent with 
the rest of the code base in the driver?

> +		return err;
> +
>   	return count;
>   }
>   
> @@ -433,8 +384,27 @@ static ssize_t pwm1_auto_channels_temp_show(struct device *dev,
>   					    struct device_attribute *devattr,
>   					    char *buf)
>   {
> -	struct amc6821_data *data = amc6821_update_device(dev);
> -	return sprintf(buf, "%d\n", data->pwm1_auto_channels_temp);
> +	struct amc6821_data *data = dev_get_drvdata(dev);
> +	u32 val;
> +	int err;
> +
> +	err = regmap_read(data->regmap, AMC6821_REG_CONF1, &val);
> +	if (err)
> +		return err;
> +	switch (val & (AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1)) {
> +	case 0:
> +	case AMC6821_CONF1_FDRC0:
> +		val = 0;	/* manual or target rpm controlled */
> +		break;
> +	case AMC6821_CONF1_FDRC1:
> +		val = 2;	/* remote temp controlled */
> +		break;
> +	default:
> +		val = 3;	/* max(local, remote) temp controlled */
> +		break;
> +	}
> +
> +	return sprintf(buf, "%d\n", val);
>   }
>   
>   static ssize_t temp_auto_point_temp_show(struct device *dev,
> @@ -443,7 +413,8 @@ static ssize_t temp_auto_point_temp_show(struct device *dev,
>   {
>   	int ix = to_sensor_dev_attr_2(devattr)->index;
>   	int nr = to_sensor_dev_attr_2(devattr)->nr;
> -	struct amc6821_data *data = amc6821_update_device(dev);
> +	struct amc6821_data *data = dev_get_drvdata(dev);
> +
>   	switch (nr) {
>   	case 1:
>   		return sprintf(buf, "%d\n",
> @@ -461,44 +432,59 @@ static ssize_t pwm1_auto_point_pwm_show(struct device *dev,
>   					struct device_attribute *devattr,
>   					char *buf)
>   {
> +	struct amc6821_data *data = dev_get_drvdata(dev);
>   	int ix = to_sensor_dev_attr(devattr)->index;
> -	struct amc6821_data *data = amc6821_update_device(dev);
> -	return sprintf(buf, "%d\n", data->pwm1_auto_point_pwm[ix]);
> +	u32 val;
> +	int err;
> +
> +	switch (ix) {
> +	case 0:
> +		val = 0;
> +		break;
> +	case 1:
> +		err = regmap_read(data->regmap, AMC6821_REG_DCY_LOW_TEMP, &val);
> +		if (err)
> +			return err;
> +		break;
> +	default:
> +		val = 255;
> +		break;
> +	}
> +	return sysfs_emit(buf, "%d\n", val);
>   }
>   
> -static inline ssize_t set_slope_register(struct i2c_client *client,
> -		u8 reg,
> -		u8 dpwm,
> -		u8 *ptemp)
> +static inline int set_slope_register(struct regmap *regmap,
> +				     u8 reg, u8 *ptemp)
>   {
> -	int dt;
> -	u8 tmp;
> +	u8 tmp, dpwm;
> +	int err, dt;
> +	u32 pwm;
>   
> -	dt = ptemp[2]-ptemp[1];
> +	err = regmap_read(regmap, AMC6821_REG_DCY_LOW_TEMP, &pwm);
> +	if (err)
> +		return err;
> +
> +	dpwm = 255 - pwm;
> +
> +	dt = ptemp[2] - ptemp[1];
>   	for (tmp = 4; tmp > 0; tmp--) {
>   		if (dt * (0x20 >> tmp) >= dpwm)
>   			break;
>   	}
>   	tmp |= (ptemp[1] & 0x7C) << 1;
> -	if (i2c_smbus_write_byte_data(client,
> -			reg, tmp)) {
> -		dev_err(&client->dev, "Register write error, aborting.\n");
> -		return -EIO;
> -	}
> -	return 0;
> +	return regmap_write(regmap, reg, tmp);
>   }
>   
>   static ssize_t temp_auto_point_temp_store(struct device *dev,
>   					  struct device_attribute *attr,
>   					  const char *buf, size_t count)
>   {
> -	struct amc6821_data *data = amc6821_update_device(dev);
> -	struct i2c_client *client = data->client;
> +	struct amc6821_data *data = dev_get_drvdata(dev);
> +	struct regmap *regmap = data->regmap;
>   	int ix = to_sensor_dev_attr_2(attr)->index;
>   	int nr = to_sensor_dev_attr_2(attr)->nr;
>   	u8 *ptemp;
>   	u8 reg;
> -	int dpwm;
>   	long val;
>   	int ret = kstrtol(buf, 10, &val);
>   	if (ret)
> @@ -519,7 +505,6 @@ static ssize_t temp_auto_point_temp_store(struct device *dev,
>   	}
>   
>   	mutex_lock(&data->update_lock);
> -	data->valid = false;
>   
>   	switch (ix) {
>   	case 0:
> @@ -528,13 +513,9 @@ static ssize_t temp_auto_point_temp_store(struct device *dev,
>   		ptemp[0] = clamp_val(ptemp[0], 0,
>   				     data->temp2_auto_point_temp[1]);
>   		ptemp[0] = clamp_val(ptemp[0], 0, 63);
> -		if (i2c_smbus_write_byte_data(
> -					client,
> -					AMC6821_REG_PSV_TEMP,
> -					ptemp[0])) {
> -				dev_err(&client->dev,
> -					"Register write error, aborting.\n");
> -				count = -EIO;
> +		if (regmap_write(regmap, AMC6821_REG_PSV_TEMP, ptemp[0])) {
> +			dev_err(dev, "Register write error, aborting.\n");
> +			count = -EIO;
>   		}
>   		goto EXIT;
>   	case 1:
> @@ -550,8 +531,7 @@ static ssize_t temp_auto_point_temp_store(struct device *dev,
>   		count = -EINVAL;
>   		goto EXIT;
>   	}
> -	dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
> -	if (set_slope_register(client, reg, dpwm, ptemp))
> +	if (set_slope_register(regmap, reg, ptemp))
>   		count = -EIO;
>   
>   EXIT:
> @@ -564,38 +544,37 @@ static ssize_t pwm1_auto_point_pwm_store(struct device *dev,
>   					 const char *buf, size_t count)
>   {
>   	struct amc6821_data *data = dev_get_drvdata(dev);
> -	struct i2c_client *client = data->client;
> -	int dpwm;
> -	unsigned long val;
> -	int ret = kstrtoul(buf, 10, &val);
> +	struct regmap *regmap = data->regmap;
> +	long val;
> +	int ret;
> +
> +	ret = kstrtoul(buf, 10, &val);
>   	if (ret)
>   		return ret;
>   
> -	if (val > 255)
> +	if (val > 254)

I think this should have been squashed with an earlier commit?

>   		return -EINVAL;
>   
>   	mutex_lock(&data->update_lock);
> -	data->pwm1_auto_point_pwm[1] = val;
> -	if (i2c_smbus_write_byte_data(client, AMC6821_REG_DCY_LOW_TEMP,
> -			data->pwm1_auto_point_pwm[1])) {
> -		dev_err(&client->dev, "Register write error, aborting.\n");
> -		count = -EIO;
> -		goto EXIT;
> +
> +	ret = regmap_write(regmap, AMC6821_REG_DCY_LOW_TEMP, val);
> +	if (ret)
> +		goto unlock;
> +
> +	ret = set_slope_register(regmap, AMC6821_REG_LTEMP_FAN_CTRL,
> +				 data->temp1_auto_point_temp);
> +	if (ret) {
> +		count = ret;
> +		goto unlock;
>   	}
> -	dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
> -	if (set_slope_register(client, AMC6821_REG_LTEMP_FAN_CTRL, dpwm,
> -			data->temp1_auto_point_temp)) {
> -		count = -EIO;
> -		goto EXIT;
> -	}
> -	if (set_slope_register(client, AMC6821_REG_RTEMP_FAN_CTRL, dpwm,
> -			data->temp2_auto_point_temp)) {
> -		count = -EIO;
> -		goto EXIT;
> +	ret = set_slope_register(regmap, AMC6821_REG_RTEMP_FAN_CTRL,
> +				 data->temp2_auto_point_temp);
> +	if (ret) {
> +		count = ret;
> +		goto unlock;
>   	}
>   
> -EXIT:
> -	data->valid = false;
> +unlock:
>   	mutex_unlock(&data->update_lock);
>   	return count;
>   }
> @@ -603,58 +582,72 @@ static ssize_t pwm1_auto_point_pwm_store(struct device *dev,
>   static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
>   			char *buf)
>   {
> -	struct amc6821_data *data = amc6821_update_device(dev);
> +	struct amc6821_data *data = dev_get_drvdata(dev);
>   	int ix = to_sensor_dev_attr(devattr)->index;
> -	if (0 == data->fan[ix])
> -		return sprintf(buf, "6000000");
> -	return sprintf(buf, "%d\n", (int)(6000000 / data->fan[ix]));
> +	u32 regval;
> +	u8 regs[2];

Can't this be a u16 directly.......

> +	int err;
> +
> +	err = regmap_bulk_read(data->regmap, fan_reg_low[ix], regs, 2);
> +	if (err)
> +		return err;
> +	regval = (regs[1] << 8) | regs[0];
> +


..... to avoid doing this here?

> +	return sysfs_emit(buf, "%d\n", 6000000 / (regval ? : 1));
>   }
>   
>   static ssize_t fan1_fault_show(struct device *dev,
>   			       struct device_attribute *devattr, char *buf)
>   {
> -	struct amc6821_data *data = amc6821_update_device(dev);
> -	if (data->stat1 & AMC6821_STAT1_FANS)
> -		return sprintf(buf, "1");
> -	else
> -		return sprintf(buf, "0");
> +	struct amc6821_data *data = dev_get_drvdata(dev);
> +	u32 regval;
> +	int err;
> +
> +	err = regmap_read(data->regmap, AMC6821_REG_STAT1, &regval);
> +	if (err)
> +		return err;
> +
> +	return sysfs_emit(buf, "%d\n", !!(regval & AMC6821_STAT1_FANS));
>   }
>   
>   static ssize_t fan_store(struct device *dev, struct device_attribute *attr,
>   			 const char *buf, size_t count)
>   {
>   	struct amc6821_data *data = dev_get_drvdata(dev);
> -	struct i2c_client *client = data->client;
> -	long val;
>   	int ix = to_sensor_dev_attr(attr)->index;
> -	int ret = kstrtol(buf, 10, &val);
> -	if (ret)
> -		return ret;
> -	val = val < 1 ? 0xFFFF : 6000000 / val;
> +	u8 regs[2];

Ditto.

> +	long val;
> +	int err;
> +
> +	err = kstrtol(buf, 10, &val);
> +	if (err)
> +		return err;
> +
> +	val = val < 1 ? 0xFFFF : 6000000 / val;
> +	val = clamp_val(val, 0, 0xFFFF);
> +
> +	regs[0] = val & 0xff;
> +	regs[1] = val >> 8;
> +

to avoid this here.

> +	err = regmap_bulk_write(data->regmap, fan_reg_low[ix], regs, 2);
> +	if (err)
> +		return err;
>   
> -	mutex_lock(&data->update_lock);
> -	data->fan[ix] = (u16)clamp_val(val, 0, 0xFFFF);
> -	if (i2c_smbus_write_byte_data(client, fan_reg_low[ix],
> -			data->fan[ix] & 0xFF)) {
> -		dev_err(&client->dev, "Register write error, aborting.\n");
> -		count = -EIO;
> -		goto EXIT;
> -	}
> -	if (i2c_smbus_write_byte_data(client,
> -			fan_reg_hi[ix], data->fan[ix] >> 8)) {
> -		dev_err(&client->dev, "Register write error, aborting.\n");
> -		count = -EIO;
> -	}
> -EXIT:
> -	mutex_unlock(&data->update_lock);
>   	return count;
>   }
>   
>   static ssize_t fan1_pulses_show(struct device *dev,
>   				struct device_attribute *devattr, char *buf)
>   {
> -	struct amc6821_data *data = amc6821_update_device(dev);
> -	return sprintf(buf, "%d\n", data->fan1_pulses);
> +	struct amc6821_data *data = dev_get_drvdata(dev);
> +	u32 regval;
> +	int err;
> +
> +	err = regmap_read(data->regmap, AMC6821_REG_CONF4, &regval);
> +	if (err)
> +		return err;
> +
> +	return sysfs_emit(buf, "%d\n", (regval & AMC6821_CONF4_PSPR) ? 4 : 2);
>   }
>   
>   static ssize_t fan1_pulses_store(struct device *dev,
> @@ -662,40 +655,22 @@ static ssize_t fan1_pulses_store(struct device *dev,
>   				 size_t count)
>   {
>   	struct amc6821_data *data = dev_get_drvdata(dev);
> -	struct i2c_client *client = data->client;
>   	long val;
> -	int config = kstrtol(buf, 10, &val);
> -	if (config)
> -		return config;
> +	int err;
> +
> +	err = kstrtol(buf, 10, &val);
> +	if (err)
> +		return err;
> +
> +	if (val != 2 && val != 4)
> +		return -EINVAL;
> +
> +	err = regmap_update_bits(data->regmap, AMC6821_REG_CONF4,
> +				 AMC6821_CONF4_PSPR,
> +				 val == 4 ? AMC6821_CONF4_PSPR : 0);
> +	if (err)
> +		return err;
>   
> -	mutex_lock(&data->update_lock);
> -	config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
> -	if (config < 0) {
> -		dev_err(&client->dev,
> -			"Error reading configuration register, aborting.\n");
> -		count = config;
> -		goto EXIT;
> -	}
> -	switch (val) {
> -	case 2:
> -		config &= ~AMC6821_CONF4_PSPR;
> -		data->fan1_pulses = 2;
> -		break;
> -	case 4:
> -		config |= AMC6821_CONF4_PSPR;
> -		data->fan1_pulses = 4;
> -		break;
> -	default:
> -		count = -EINVAL;
> -		goto EXIT;
> -	}
> -	if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4, config)) {
> -		dev_err(&client->dev,
> -			"Configuration register write error, aborting.\n");
> -		count = -EIO;
> -	}
> -EXIT:
> -	mutex_unlock(&data->update_lock);
>   	return count;
>   }
>   
> @@ -827,110 +802,84 @@ static int amc6821_detect(
>   	return 0;
>   }
>   
> -static int amc6821_init_client(struct i2c_client *client)
> +static int amc6821_init_client(struct amc6821_data *data)
>   {
> -	int config;
> -	int err = -EIO;
> +	struct regmap *regmap = data->regmap;
> +	int err;
> +
> +	err = amc6821_init_auto_point_data(data);
> +	if (err)
> +		return err;
>   
>   	if (init) {
> -		config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
> -
> -		if (config < 0) {
> -				dev_err(&client->dev,
> -			"Error reading configuration register, aborting.\n");
> -				return err;
> -		}
> -
> -		config |= AMC6821_CONF4_MODE;
> -
> -		if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
> -				config)) {
> -			dev_err(&client->dev,
> -			"Configuration register write error, aborting.\n");
> +		err = regmap_set_bits(regmap, AMC6821_REG_CONF4, AMC6821_CONF4_MODE);
> +		if (err)
>   			return err;
> -		}
> -
> -		config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
> -
> -		if (config < 0) {
> -			dev_err(&client->dev,
> -			"Error reading configuration register, aborting.\n");
> +		err = regmap_clear_bits(regmap, AMC6821_REG_CONF3, AMC6821_CONF3_THERM_FAN_EN);
> +		if (err)
>   			return err;
> -		}
> -
> -		dev_info(&client->dev, "Revision %d\n", config & 0x0f);
> -
> -		config &= ~AMC6821_CONF3_THERM_FAN_EN;
> -
> -		if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
> -				config)) {
> -			dev_err(&client->dev,
> -			"Configuration register write error, aborting.\n");
> +		err = regmap_clear_bits(regmap, AMC6821_REG_CONF2,
> +					AMC6821_CONF2_RTFIE |
> +					AMC6821_CONF2_LTOIE |
> +					AMC6821_CONF2_RTOIE);
> +		if (err)
>   			return err;
> -		}
>   
> -		config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
> -
> -		if (config < 0) {
> -			dev_err(&client->dev,
> -			"Error reading configuration register, aborting.\n");
> +		err = regmap_update_bits(regmap, AMC6821_REG_CONF1,
> +					 AMC6821_CONF1_THERMOVIE | AMC6821_CONF1_FANIE |
> +					 AMC6821_CONF1_START | AMC6821_CONF1_PWMINV,
> +					 AMC6821_CONF1_START |
> +					 (pwminv ? AMC6821_CONF1_PWMINV : 0));
> +		if (err)
>   			return err;
> -		}
> -
> -		config &= ~AMC6821_CONF2_RTFIE;
> -		config &= ~AMC6821_CONF2_LTOIE;
> -		config &= ~AMC6821_CONF2_RTOIE;
> -		if (i2c_smbus_write_byte_data(client,
> -				AMC6821_REG_CONF2, config)) {
> -			dev_err(&client->dev,
> -			"Configuration register write error, aborting.\n");
> -			return err;
> -		}
> -
> -		config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
> -
> -		if (config < 0) {
> -			dev_err(&client->dev,
> -			"Error reading configuration register, aborting.\n");
> -			return err;
> -		}
> -
> -		config &= ~AMC6821_CONF1_THERMOVIE;
> -		config &= ~AMC6821_CONF1_FANIE;
> -		config |= AMC6821_CONF1_START;
> -		if (pwminv)
> -			config |= AMC6821_CONF1_PWMINV;
> -		else
> -			config &= ~AMC6821_CONF1_PWMINV;
> -
> -		if (i2c_smbus_write_byte_data(
> -				client, AMC6821_REG_CONF1, config)) {
> -			dev_err(&client->dev,
> -			"Configuration register write error, aborting.\n");
> -			return err;
> -		}
>   	}
>   	return 0;
>   }
>   
> +static bool amc6821_volatile_reg(struct device *dev, unsigned int reg)
> +{
> +	switch (reg) {
> +	case AMC6821_REG_STAT1:
> +	case AMC6821_REG_STAT2:
> +	case AMC6821_REG_TEMP_LO:
> +	case AMC6821_REG_TDATA_LOW: > +	case AMC6821_REG_LTEMP_HI:
> +	case AMC6821_REG_RTEMP_HI:
> +	case AMC6821_REG_TDATA_HI:
> +		return true;
> +	default:
> +		return false;
> +	}
> +}
> +
> +static const struct regmap_config amc6821_regmap_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = AMC6821_REG_CONF3,
> +	.volatile_reg = amc6821_volatile_reg,
> +	.cache_type = REGCACHE_MAPLE,
> +};
> +
>   static int amc6821_probe(struct i2c_client *client)
>   {
>   	struct device *dev = &client->dev;
>   	struct amc6821_data *data;
>   	struct device *hwmon_dev;
> +	struct regmap *regmap;

Save this variable by using data->client directly?

Cheers,
Quentin

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