From: Greg KH <greg@kroah.com>
To: linux-kernel@vger.kernel.org, sensors@stimpy.netroedge.com
Subject: Re: [PATCH] More i2c driver changes for 2.5.69
Date: Fri, 9 May 2003 16:56:34 -0700 [thread overview]
Message-ID: <10525245943373@kroah.com> (raw)
In-Reply-To: <10525245943578@kroah.com>
ChangeSet 1.1083.2.4, 2003/05/09 14:54:15-07:00, warp@mercury.d2dc.net
[PATCH] I2C: Yet another it87 patch.
Ok, after writing up something in the way of a perl script to make some
sense of the data for voltages, and finding that there is no sense to
make, I took a longer look at things.
The it87 driver in 2.5.x is doing some, down right /odd/ math on the
numbers for the in_input* readings, and the 2.4.x driver is doing
something quite different.
And while it might be possible to get sane numbers out of the 2.5.x
driver, people /expect/ to get the numbers that they were getting from
2.4.x.
So this patch puts things back to the simpler calculations done by the
2.4.x lm-sensors drivers, and my script confirms that the numbers come
out right.
drivers/i2c/chips/it87.c | 84 ++++++++++++-----------------------------------
1 files changed, 23 insertions(+), 61 deletions(-)
diff -Nru a/drivers/i2c/chips/it87.c b/drivers/i2c/chips/it87.c
--- a/drivers/i2c/chips/it87.c Fri May 9 16:47:59 2003
+++ b/drivers/i2c/chips/it87.c Fri May 9 16:47:59 2003
@@ -99,46 +99,8 @@
#define IT87_REG_CHIPID 0x58
-static inline u8 IN_TO_REG(long val, int inNum)
-{
- /* to avoid floating point, we multiply everything by 100.
- val is guaranteed to be positive, so we can achieve the effect of
- rounding by (...*10+5)/10. Note that the *10 is hidden in the
- /250 (which should really be /2500).
- At the end, we need to /100 because we *100 everything and we need
- to /10 because of the rounding thing, so we /1000. */
- if (inNum <= 1)
- return (u8)
- SENSORS_LIMIT(((val * 210240 - 13300) / 250 + 5) / 1000,
- 0, 255);
- else if (inNum == 2)
- return (u8)
- SENSORS_LIMIT(((val * 157370 - 13300) / 250 + 5) / 1000,
- 0, 255);
- else if (inNum == 3)
- return (u8)
- SENSORS_LIMIT(((val * 101080 - 13300) / 250 + 5) / 1000,
- 0, 255);
- else
- return (u8) SENSORS_LIMIT(((val * 41714 - 13300) / 250 + 5)
- / 1000, 0, 255);
-}
-
-static inline long IN_FROM_REG(u8 val, int inNum)
-{
- /* to avoid floating point, we multiply everything by 100.
- val is guaranteed to be positive, so we can achieve the effect of
- rounding by adding 0.5. Or, to avoid fp math, we do (...*10+5)/10.
- We need to scale with *100 anyway, so no need to /100 at the end. */
- if (inNum <= 1)
- return (long) (((250000 * val + 13300) / 210240 * 10 + 5) /10);
- else if (inNum == 2)
- return (long) (((250000 * val + 13300) / 157370 * 10 + 5) /10);
- else if (inNum == 3)
- return (long) (((250000 * val + 13300) / 101080 * 10 + 5) /10);
- else
- return (long) (((250000 * val + 13300) / 41714 * 10 + 5) /10);
-}
+#define IN_TO_REG(val) (SENSORS_LIMIT((((val) * 10 + 8)/16),0,255))
+#define IN_FROM_REG(val) (((val) * 16) / 10)
static inline u8 FAN_TO_REG(long rpm, int div)
{
@@ -279,7 +241,7 @@
struct i2c_client *client = to_i2c_client(dev);
struct it87_data *data = i2c_get_clientdata(client);
it87_update_client(client);
- return sprintf(buf, "%ld\n", IN_FROM_REG(data->in[nr], nr)*10 );
+ return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr])*10 );
}
static ssize_t show_in_min(struct device *dev, char *buf, int nr)
@@ -287,7 +249,7 @@
struct i2c_client *client = to_i2c_client(dev);
struct it87_data *data = i2c_get_clientdata(client);
it87_update_client(client);
- return sprintf(buf, "%ld\n", IN_FROM_REG(data->in_min[nr], nr)*10 );
+ return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr])*10 );
}
static ssize_t show_in_max(struct device *dev, char *buf, int nr)
@@ -295,7 +257,7 @@
struct i2c_client *client = to_i2c_client(dev);
struct it87_data *data = i2c_get_clientdata(client);
it87_update_client(client);
- return sprintf(buf, "%ld\n", IN_FROM_REG(data->in_max[nr], nr)*10 );
+ return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr])*10 );
}
static ssize_t set_in_min(struct device *dev, const char *buf,
@@ -304,7 +266,7 @@
struct i2c_client *client = to_i2c_client(dev);
struct it87_data *data = i2c_get_clientdata(client);
unsigned long val = simple_strtoul(buf, NULL, 10)/10;
- data->in_min[nr] = IN_TO_REG(val,nr);
+ data->in_min[nr] = IN_TO_REG(val);
it87_write_value(client, IT87_REG_VIN_MIN(nr),
data->in_min[nr]);
return count;
@@ -315,7 +277,7 @@
struct i2c_client *client = to_i2c_client(dev);
struct it87_data *data = i2c_get_clientdata(client);
unsigned long val = simple_strtoul(buf, NULL, 10)/10;
- data->in_max[nr] = IN_TO_REG(val,nr);
+ data->in_max[nr] = IN_TO_REG(val);
it87_write_value(client, IT87_REG_VIN_MAX(nr),
data->in_max[nr]);
return count;
@@ -855,37 +817,37 @@
This sets fan-divs to 2, among others */
it87_write_value(client, IT87_REG_CONFIG, 0x80);
it87_write_value(client, IT87_REG_VIN_MIN(0),
- IN_TO_REG(IT87_INIT_IN_MIN_0, 0));
+ IN_TO_REG(IT87_INIT_IN_MIN_0));
it87_write_value(client, IT87_REG_VIN_MAX(0),
- IN_TO_REG(IT87_INIT_IN_MAX_0, 0));
+ IN_TO_REG(IT87_INIT_IN_MAX_0));
it87_write_value(client, IT87_REG_VIN_MIN(1),
- IN_TO_REG(IT87_INIT_IN_MIN_1, 1));
+ IN_TO_REG(IT87_INIT_IN_MIN_1));
it87_write_value(client, IT87_REG_VIN_MAX(1),
- IN_TO_REG(IT87_INIT_IN_MAX_1, 1));
+ IN_TO_REG(IT87_INIT_IN_MAX_1));
it87_write_value(client, IT87_REG_VIN_MIN(2),
- IN_TO_REG(IT87_INIT_IN_MIN_2, 2));
+ IN_TO_REG(IT87_INIT_IN_MIN_2));
it87_write_value(client, IT87_REG_VIN_MAX(2),
- IN_TO_REG(IT87_INIT_IN_MAX_2, 2));
+ IN_TO_REG(IT87_INIT_IN_MAX_2));
it87_write_value(client, IT87_REG_VIN_MIN(3),
- IN_TO_REG(IT87_INIT_IN_MIN_3, 3));
+ IN_TO_REG(IT87_INIT_IN_MIN_3));
it87_write_value(client, IT87_REG_VIN_MAX(3),
- IN_TO_REG(IT87_INIT_IN_MAX_3, 3));
+ IN_TO_REG(IT87_INIT_IN_MAX_3));
it87_write_value(client, IT87_REG_VIN_MIN(4),
- IN_TO_REG(IT87_INIT_IN_MIN_4, 4));
+ IN_TO_REG(IT87_INIT_IN_MIN_4));
it87_write_value(client, IT87_REG_VIN_MAX(4),
- IN_TO_REG(IT87_INIT_IN_MAX_4, 4));
+ IN_TO_REG(IT87_INIT_IN_MAX_4));
it87_write_value(client, IT87_REG_VIN_MIN(5),
- IN_TO_REG(IT87_INIT_IN_MIN_5, 5));
+ IN_TO_REG(IT87_INIT_IN_MIN_5));
it87_write_value(client, IT87_REG_VIN_MAX(5),
- IN_TO_REG(IT87_INIT_IN_MAX_5, 5));
+ IN_TO_REG(IT87_INIT_IN_MAX_5));
it87_write_value(client, IT87_REG_VIN_MIN(6),
- IN_TO_REG(IT87_INIT_IN_MIN_6, 6));
+ IN_TO_REG(IT87_INIT_IN_MIN_6));
it87_write_value(client, IT87_REG_VIN_MAX(6),
- IN_TO_REG(IT87_INIT_IN_MAX_6, 6));
+ IN_TO_REG(IT87_INIT_IN_MAX_6));
it87_write_value(client, IT87_REG_VIN_MIN(7),
- IN_TO_REG(IT87_INIT_IN_MIN_7, 7));
+ IN_TO_REG(IT87_INIT_IN_MIN_7));
it87_write_value(client, IT87_REG_VIN_MAX(7),
- IN_TO_REG(IT87_INIT_IN_MAX_7, 7));
+ IN_TO_REG(IT87_INIT_IN_MAX_7));
/* Note: Battery voltage does not have limit registers */
it87_write_value(client, IT87_REG_FAN_MIN(1),
FAN_TO_REG(IT87_INIT_FAN_MIN_1, 2));
next prev parent reply other threads:[~2003-05-09 23:46 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-09 23:55 [BK PATCH] More i2c driver changes for 2.5.69 Greg KH
2003-05-09 23:56 ` [PATCH] " Greg KH
2003-05-09 23:56 ` Greg KH
2003-05-09 23:56 ` Greg KH
2003-05-09 23:56 ` Greg KH [this message]
2003-05-09 23:56 ` Greg KH
2003-05-09 23:56 ` Greg KH
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