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Clean init function:

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* Do not reset the chip.
* Preserve configuration bits we don't explicitely write to.


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@2736 7894878c-1315-0410-8ee3-d5d059ff63e0
This commit is contained in:
Jean Delvare committed 2004-10-16 09:46:37 +00:00
1 parent 5609f38225
commit d49077fd70
1 file changed
+11 -8
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kernel/chips/lm87.c
+11 -8
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@@ -504,15 +504,11 @@ static int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
return i2c_smbus_write_byte_data(client, reg, value);
}
/* Called when we have found a new LM87. It should set limits, etc. */
/* Called when we have found a new LM87. */
static void lm87_init_client(struct i2c_client *client)
{
struct lm87_data *data = client->data;
/* Reset all except Watchdog values and last conversion values
This sets fan-divs to 2, among others. This makes most other
initializations unnecessary */
lm87_write_value(client, LM87_REG_CONFIG, 0x80);
u8 reg;
/* Setup Channel Mode register for configuration of monitoring
* Default is 00000000b
@@ -526,8 +522,10 @@ static void lm87_init_client(struct i2c_client *client)
* bit 7 - Configures VID/IRQ input as interrupts if = 1
*/
/* Preserve 4 MSB */
reg = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
/* I know, not clean, but it works. :'p */
lm87_write_value(client, LM87_REG_CHANNEL_MODE,
lm87_write_value(client, LM87_REG_CHANNEL_MODE, (reg & 0xf0) |
#ifdef LM87_AIN1
0x01
#else
@@ -556,7 +554,12 @@ static void lm87_init_client(struct i2c_client *client)
data->vrm = DEFAULT_VRM;
/* Start monitoring */
lm87_write_value(client, LM87_REG_CONFIG, 0x01);
reg = lm87_read_value(client, LM87_REG_CONFIG);
if (!(reg & 0x01)) {
printk(KERN_INFO "lm87.o: Monitoring starts\n");
lm87_write_value(client, LM87_REG_CONFIG,
(reg & 0x7e) | 0x01);
}
}
static void lm87_update_client(struct i2c_client *client)