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hwmon: (lm90) Define status bits 

Add bit defines for the status register. And add a function
lm90_is_tripped() which will read status register and return
tripped or not, then lm90_alert can call it directly, and in the
future the IRQ thread also can use it.

[JD: Adjusted to include all the new MAX6696 status flags.]

Signed-off-by: Wei Ni <wni@nvidia.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Wei Ni 2013-11-15 10:40:38 +01:00 committed by Jean Delvare
parent e41fae2b1e
commit 072de4969f
1 changed files with 61 additions and 27 deletions
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88
drivers/hwmon/lm90.c
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@ -179,6 +179,23 @@ enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
#define LM90_HAVE_TEMP3 (1 << 6) /* 3rd temperature sensor */
#define LM90_HAVE_BROKEN_ALERT (1 << 7) /* Broken alert */
/* LM90 status */
#define LM90_STATUS_LTHRM (1 << 0) /* local THERM limit tripped */
#define LM90_STATUS_RTHRM (1 << 1) /* remote THERM limit tripped */
#define LM90_STATUS_ROPEN (1 << 2) /* remote is an open circuit */
#define LM90_STATUS_RLOW (1 << 3) /* remote low temp limit tripped */
#define LM90_STATUS_RHIGH (1 << 4) /* remote high temp limit tripped */
#define LM90_STATUS_LLOW (1 << 5) /* local low temp limit tripped */
#define LM90_STATUS_LHIGH (1 << 6) /* local high temp limit tripped */
#define MAX6696_STATUS2_R2THRM (1 << 1) /* remote2 THERM limit tripped */
#define MAX6696_STATUS2_R2OPEN (1 << 2) /* remote2 is an open circuit */
#define MAX6696_STATUS2_R2LOW (1 << 3) /* remote2 low temp limit tripped */
#define MAX6696_STATUS2_R2HIGH (1 << 4) /* remote2 high temp limit tripped */
#define MAX6696_STATUS2_ROT2 (1 << 5) /* remote emergency limit tripped */
#define MAX6696_STATUS2_R2OT2 (1 << 6) /* remote2 emergency limit tripped */
#define MAX6696_STATUS2_LOT2 (1 << 7) /* local emergency limit tripped */
/*
* Driver data (common to all clients)
*/
@ -1391,6 +1408,43 @@ static void lm90_init_client(struct i2c_client *client)
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
}
static bool lm90_is_tripped(struct i2c_client *client, u16 *status)
{
struct lm90_data *data = i2c_get_clientdata(client);
u8 st, st2 = 0;
lm90_read_reg(client, LM90_REG_R_STATUS, &st);
if (data->kind == max6696)
lm90_read_reg(client, MAX6696_REG_R_STATUS2, &st2);
*status = st | (st2 << 8);
if ((st & 0x7f) == 0 && (st2 & 0xfe) == 0)
return false;
if ((st & (LM90_STATUS_LLOW | LM90_STATUS_LHIGH | LM90_STATUS_LTHRM)) ||
(st2 & MAX6696_STATUS2_LOT2))
dev_warn(&client->dev,
"temp%d out of range, please check!\n", 1);
if ((st & (LM90_STATUS_RLOW | LM90_STATUS_RHIGH | LM90_STATUS_RTHRM)) ||
(st2 & MAX6696_STATUS2_ROT2))
dev_warn(&client->dev,
"temp%d out of range, please check!\n", 2);
if (st & LM90_STATUS_ROPEN)
dev_warn(&client->dev,
"temp%d diode open, please check!\n", 2);
if (st2 & (MAX6696_STATUS2_R2LOW | MAX6696_STATUS2_R2HIGH |
MAX6696_STATUS2_R2THRM | MAX6696_STATUS2_R2OT2))
dev_warn(&client->dev,
"temp%d out of range, please check!\n", 3);
if (st2 & MAX6696_STATUS2_R2OPEN)
dev_warn(&client->dev,
"temp%d diode open, please check!\n", 3);
return true;
}
static int lm90_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@ -1489,46 +1543,26 @@ static int lm90_remove(struct i2c_client *client)
static void lm90_alert(struct i2c_client *client, unsigned int flag)
{
struct lm90_data *data = i2c_get_clientdata(client);
u8 config, alarms, alarms2 = 0;
lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
if (data->kind == max6696)
lm90_read_reg(client, MAX6696_REG_R_STATUS2, &alarms2);
if ((alarms & 0x7f) == 0 && (alarms2 & 0xfe) == 0) {
dev_info(&client->dev, "Everything OK\n");
} else {
if ((alarms & 0x61) || (alarms2 & 0x80))
dev_warn(&client->dev,
"temp%d out of range, please check!\n", 1);
if ((alarms & 0x1a) || (alarms2 & 0x20))
dev_warn(&client->dev,
"temp%d out of range, please check!\n", 2);
if (alarms & 0x04)
dev_warn(&client->dev,
"temp%d diode open, please check!\n", 2);
if (alarms2 & 0x5a)
dev_warn(&client->dev,
"temp%d out of range, please check!\n", 3);
if (alarms2 & 0x04)
dev_warn(&client->dev,
"temp%d diode open, please check!\n", 3);
u16 alarms;
if (lm90_is_tripped(client, &alarms)) {
/*
* Disable ALERT# output, because these chips don't implement
* SMBus alert correctly; they should only hold the alert line
* low briefly.
*/
struct lm90_data *data = i2c_get_clientdata(client);
if ((data->flags & LM90_HAVE_BROKEN_ALERT)
&& (alarms & data->alert_alarms)) {
u8 config;
dev_dbg(&client->dev, "Disabling ALERT#\n");
lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
config | 0x80);
}
} else {
dev_info(&client->dev, "Everything OK\n");
}
}