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SubjectRe: [PATCH] i2c driver fixes for 2.6.4
Date
From
ChangeSet 1.1597.1.10, 2004/03/01 11:27:29-08:00, komoriya@paken.org

[PATCH] I2C: it87 reset option

I wrote a patch which adds reset option to the it87 driver talking
with Jean Delvare.

* Do not reset the registers unless users want to do because
resetting registers makes all fans go to full power and we can
usually rely on values set by BIOS
* Remove all limit initializations as they should be done from
user-space
* Better register mask for start of monitoring


drivers/i2c/chips/it87.c | 162 +++++++++++------------------------------------
1 files changed, 38 insertions(+), 124 deletions(-)

diff -Nru a/drivers/i2c/chips/it87.c b/drivers/i2c/chips/it87.c
--- a/drivers/i2c/chips/it87.c Mon Mar 15 14:35:47 2004
+++ b/drivers/i2c/chips/it87.c Mon Mar 15 14:35:47 2004
@@ -55,7 +55,10 @@


/* Update battery voltage after every reading if true */
-static int update_vbat = 0;
+static int update_vbat;
+
+/* Reset the registers on init if true */
+static int reset;

/* Many IT87 constants specified below */

@@ -129,61 +132,6 @@
}
#define DIV_FROM_REG(val) (1 << (val))

-/* Initial limits. Use the config file to set better limits. */
-#define IT87_INIT_IN_0 170
-#define IT87_INIT_IN_1 250
-#define IT87_INIT_IN_2 (330 / 2)
-#define IT87_INIT_IN_3 (((500) * 100)/168)
-#define IT87_INIT_IN_4 (((1200) * 10)/38)
-#define IT87_INIT_IN_5 (((1200) * 10)/72)
-#define IT87_INIT_IN_6 (((500) * 10)/56)
-#define IT87_INIT_IN_7 (((500) * 100)/168)
-
-#define IT87_INIT_IN_PERCENTAGE 10
-
-#define IT87_INIT_IN_MIN_0 \
- (IT87_INIT_IN_0 - IT87_INIT_IN_0 * IT87_INIT_IN_PERCENTAGE / 100)
-#define IT87_INIT_IN_MAX_0 \
- (IT87_INIT_IN_0 + IT87_INIT_IN_0 * IT87_INIT_IN_PERCENTAGE / 100)
-#define IT87_INIT_IN_MIN_1 \
- (IT87_INIT_IN_1 - IT87_INIT_IN_1 * IT87_INIT_IN_PERCENTAGE / 100)
-#define IT87_INIT_IN_MAX_1 \
- (IT87_INIT_IN_1 + IT87_INIT_IN_1 * IT87_INIT_IN_PERCENTAGE / 100)
-#define IT87_INIT_IN_MIN_2 \
- (IT87_INIT_IN_2 - IT87_INIT_IN_2 * IT87_INIT_IN_PERCENTAGE / 100)
-#define IT87_INIT_IN_MAX_2 \
- (IT87_INIT_IN_2 + IT87_INIT_IN_2 * IT87_INIT_IN_PERCENTAGE / 100)
-#define IT87_INIT_IN_MIN_3 \
- (IT87_INIT_IN_3 - IT87_INIT_IN_3 * IT87_INIT_IN_PERCENTAGE / 100)
-#define IT87_INIT_IN_MAX_3 \
- (IT87_INIT_IN_3 + IT87_INIT_IN_3 * IT87_INIT_IN_PERCENTAGE / 100)
-#define IT87_INIT_IN_MIN_4 \
- (IT87_INIT_IN_4 - IT87_INIT_IN_4 * IT87_INIT_IN_PERCENTAGE / 100)
-#define IT87_INIT_IN_MAX_4 \
- (IT87_INIT_IN_4 + IT87_INIT_IN_4 * IT87_INIT_IN_PERCENTAGE / 100)
-#define IT87_INIT_IN_MIN_5 \
- (IT87_INIT_IN_5 - IT87_INIT_IN_5 * IT87_INIT_IN_PERCENTAGE / 100)
-#define IT87_INIT_IN_MAX_5 \
- (IT87_INIT_IN_5 + IT87_INIT_IN_5 * IT87_INIT_IN_PERCENTAGE / 100)
-#define IT87_INIT_IN_MIN_6 \
- (IT87_INIT_IN_6 - IT87_INIT_IN_6 * IT87_INIT_IN_PERCENTAGE / 100)
-#define IT87_INIT_IN_MAX_6 \
- (IT87_INIT_IN_6 + IT87_INIT_IN_6 * IT87_INIT_IN_PERCENTAGE / 100)
-#define IT87_INIT_IN_MIN_7 \
- (IT87_INIT_IN_7 - IT87_INIT_IN_7 * IT87_INIT_IN_PERCENTAGE / 100)
-#define IT87_INIT_IN_MAX_7 \
- (IT87_INIT_IN_7 + IT87_INIT_IN_7 * IT87_INIT_IN_PERCENTAGE / 100)
-
-#define IT87_INIT_FAN_MIN_1 3000
-#define IT87_INIT_FAN_MIN_2 3000
-#define IT87_INIT_FAN_MIN_3 3000
-
-#define IT87_INIT_TEMP_HIGH_1 600
-#define IT87_INIT_TEMP_LOW_1 200
-#define IT87_INIT_TEMP_HIGH_2 600
-#define IT87_INIT_TEMP_LOW_2 200
-#define IT87_INIT_TEMP_HIGH_3 600
-#define IT87_INIT_TEMP_LOW_3 200

/* For each registered IT87, we need to keep some data in memory. That
data is pointed to by it87_list[NR]->data. The structure itself is
@@ -822,80 +770,44 @@
return i2c_smbus_write_byte_data(client, reg, value);
}

-/* Called when we have found a new IT87. It should set limits, etc. */
+/* Called when we have found a new IT87. */
static void it87_init_client(struct i2c_client *client, struct it87_data *data)
{
- /* Reset all except Watchdog values and last conversion values
- 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));
- it87_write_value(client, IT87_REG_VIN_MAX(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));
- it87_write_value(client, IT87_REG_VIN_MAX(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));
- it87_write_value(client, IT87_REG_VIN_MAX(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));
- it87_write_value(client, IT87_REG_VIN_MAX(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));
- it87_write_value(client, IT87_REG_VIN_MAX(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));
- it87_write_value(client, IT87_REG_VIN_MAX(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));
- it87_write_value(client, IT87_REG_VIN_MAX(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));
- it87_write_value(client, IT87_REG_VIN_MAX(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(0),
- FAN_TO_REG(IT87_INIT_FAN_MIN_1, 2));
- it87_write_value(client, IT87_REG_FAN_MIN(1),
- FAN_TO_REG(IT87_INIT_FAN_MIN_2, 2));
- it87_write_value(client, IT87_REG_FAN_MIN(2),
- FAN_TO_REG(IT87_INIT_FAN_MIN_3, 2));
- it87_write_value(client, IT87_REG_TEMP_HIGH(0),
- TEMP_TO_REG(IT87_INIT_TEMP_HIGH_1));
- it87_write_value(client, IT87_REG_TEMP_LOW(0),
- TEMP_TO_REG(IT87_INIT_TEMP_LOW_1));
- it87_write_value(client, IT87_REG_TEMP_HIGH(1),
- TEMP_TO_REG(IT87_INIT_TEMP_HIGH_2));
- it87_write_value(client, IT87_REG_TEMP_LOW(1),
- TEMP_TO_REG(IT87_INIT_TEMP_LOW_2));
- it87_write_value(client, IT87_REG_TEMP_HIGH(2),
- TEMP_TO_REG(IT87_INIT_TEMP_HIGH_3));
- it87_write_value(client, IT87_REG_TEMP_LOW(2),
- TEMP_TO_REG(IT87_INIT_TEMP_LOW_3));
-
- /* Enable voltage monitors */
- it87_write_value(client, IT87_REG_VIN_ENABLE, 0xff);
-
- /* Enable Temp1-Temp3 */
- data->sensor = (it87_read_value(client, IT87_REG_TEMP_ENABLE) & 0xc0);
- data->sensor |= 0x2a; /* Temp1,Temp3=thermistor; Temp2=thermal diode */
- it87_write_value(client, IT87_REG_TEMP_ENABLE, data->sensor);
+ int tmp;

- /* Enable fans */
- it87_write_value(client, IT87_REG_FAN_CTRL,
- (it87_read_value(client, IT87_REG_FAN_CTRL) & 0x8f)
- | 0x70);
+ if (reset) {
+ /* Reset all except Watchdog values and last conversion values
+ This sets fan-divs to 2, among others */
+ it87_write_value(client, IT87_REG_CONFIG, 0x80);
+ }
+
+ /* Check if temperature channnels are reset manually or by some reason */
+ tmp = it87_read_value(client, IT87_REG_TEMP_ENABLE);
+ if ((tmp & 0x3f) == 0) {
+ /* Temp1,Temp3=thermistor; Temp2=thermal diode */
+ tmp = (tmp & 0xc0) | 0x2a;
+ it87_write_value(client, IT87_REG_TEMP_ENABLE, tmp);
+ }
+ data->sensor = tmp;
+
+ /* Check if voltage monitors are reset manually or by some reason */
+ tmp = it87_read_value(client, IT87_REG_VIN_ENABLE);
+ if ((tmp & 0xff) == 0) {
+ /* Enable all voltage monitors */
+ it87_write_value(client, IT87_REG_VIN_ENABLE, 0xff);
+ }
+
+ /* Check if tachometers are reset manually or by some reason */
+ tmp = it87_read_value(client, IT87_REG_FAN_CTRL);
+ if ((tmp & 0x70) == 0) {
+ /* Enable all fan tachometers */
+ tmp = (tmp & 0x8f) | 0x70;
+ it87_write_value(client, IT87_REG_FAN_CTRL, tmp);
+ }

/* Start monitoring */
it87_write_value(client, IT87_REG_CONFIG,
- (it87_read_value(client, IT87_REG_CONFIG) & 0xb7)
+ (it87_read_value(client, IT87_REG_CONFIG) & 0x36)
| (update_vbat ? 0x41 : 0x01));
}

@@ -988,6 +900,8 @@
MODULE_DESCRIPTION("IT8705F, IT8712F, Sis950 driver");
MODULE_PARM(update_vbat, "i");
MODULE_PARM_DESC(update_vbat, "Update vbat if set else return powerup value");
+MODULE_PARM(reset, "i");
+MODULE_PARM_DESC(reset, "Reset the chip's registers, default no");
MODULE_LICENSE("GPL");

module_init(sm_it87_init);
-
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