#define LM90_HAVE_EMERGENCY_ALARM (1 << 5)/* emergency alarm */
#define LM90_HAVE_TEMP3 (1 << 6) /* 3rd temperature sensor */
#define LM90_HAVE_BROKEN_ALERT (1 << 7) /* Broken alert */
+#define LM90_PAUSE_FOR_CONFIG (1 << 8) /* Pause conversion for config */
/* LM90 status */
#define LM90_STATUS_LTHRM (1 << 0) /* local THERM limit tripped */
.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
},
[max6657] = {
+ .flags = LM90_PAUSE_FOR_CONFIG,
.alert_alarms = 0x7c,
.max_convrate = 8,
.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
unsigned int update_interval; /* in milliseconds */
+ u8 config; /* Current configuration register value */
u8 config_orig; /* Original configuration register value */
u8 convrate_orig; /* Original conversion rate register value */
u16 alert_alarms; /* Which alarm bits trigger ALERT# */
return (newh << 8) | l;
}
+static int lm90_update_confreg(struct lm90_data *data, u8 config)
+{
+ if (data->config != config) {
+ int err;
+
+ err = i2c_smbus_write_byte_data(data->client,
+ LM90_REG_W_CONFIG1,
+ config);
+ if (err)
+ return err;
+ data->config = config;
+ }
+ return 0;
+}
+
/*
* client->update_lock must be held when calling this function (unless we are
* in detection or initialization steps), and while a remote channel other
* various registers have different meanings as a result of selecting a
* non-default remote channel.
*/
-static inline int lm90_select_remote_channel(struct i2c_client *client,
- struct lm90_data *data,
- int channel)
+static int lm90_select_remote_channel(struct lm90_data *data, int channel)
{
- int config;
+ int err = 0;
if (data->kind == max6696) {
- config = lm90_read_reg(client, LM90_REG_R_CONFIG1);
- if (config < 0)
- return config;
- config &= ~0x08;
+ u8 config = data->config & ~0x08;
+
if (channel)
config |= 0x08;
- i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
- config);
+ err = lm90_update_confreg(data, config);
}
- return 0;
+ return err;
+}
+
+static int lm90_write_convrate(struct lm90_data *data, int val)
+{
+ u8 config = data->config;
+ int err;
+
+ /* Save config and pause conversion */
+ if (data->flags & LM90_PAUSE_FOR_CONFIG) {
+ err = lm90_update_confreg(data, config | 0x40);
+ if (err < 0)
+ return err;
+ }
+
+ /* Set conv rate */
+ err = i2c_smbus_write_byte_data(data->client, LM90_REG_W_CONVRATE, val);
+
+ /* Revert change to config */
+ lm90_update_confreg(data, config);
+
+ return err;
}
/*
if (interval >= update_interval * 3 / 4)
break;
- err = i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, i);
+ err = lm90_write_convrate(data, i);
data->update_interval = DIV_ROUND_CLOSEST(update_interval, 64);
return err;
}
}
if (data->kind == max6696) {
- val = lm90_select_remote_channel(client, data, 1);
+ val = lm90_select_remote_channel(data, 1);
if (val < 0)
return val;
return val;
data->temp11[REMOTE2_HIGH] = val << 8;
- lm90_select_remote_channel(client, data, 0);
+ lm90_select_remote_channel(data, 0);
}
return 0;
data->alarms = val; /* lower 8 bit of alarms */
if (data->kind == max6696) {
- val = lm90_select_remote_channel(client, data, 1);
+ val = lm90_select_remote_channel(data, 1);
if (val < 0)
return val;
val = lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
LM90_REG_R_REMOTE_TEMPL);
if (val < 0) {
- lm90_select_remote_channel(client, data, 0);
+ lm90_select_remote_channel(data, 0);
return val;
}
data->temp11[REMOTE2_TEMP] = val;
- lm90_select_remote_channel(client, data, 0);
+ lm90_select_remote_channel(data, 0);
val = lm90_read_reg(client, MAX6696_REG_R_STATUS2);
if (val < 0)
*/
if (!(data->config_orig & 0x80) &&
!(data->alarms & data->alert_alarms)) {
- val = lm90_read_reg(client, LM90_REG_R_CONFIG1);
- if (val < 0)
- return val;
-
- if (val & 0x80) {
+ if (data->config & 0x80) {
dev_dbg(&client->dev, "Re-enabling ALERT#\n");
- i2c_smbus_write_byte_data(client,
- LM90_REG_W_CONFIG1,
- val & ~0x80);
+ lm90_update_confreg(data, data->config & ~0x80);
}
}
else
data->temp11[index] = temp_to_s8(val) << 8;
- lm90_select_remote_channel(client, data, index >= 3);
+ lm90_select_remote_channel(data, index >= 3);
err = i2c_smbus_write_byte_data(client, regp->high,
data->temp11[index] >> 8);
if (err < 0)
err = i2c_smbus_write_byte_data(client, regp->low,
data->temp11[index] & 0xff);
- lm90_select_remote_channel(client, data, 0);
+ lm90_select_remote_channel(data, 0);
return err;
}
else
data->temp8[index] = temp_to_s8(val);
- lm90_select_remote_channel(client, data, index >= 6);
+ lm90_select_remote_channel(data, index >= 6);
err = i2c_smbus_write_byte_data(client, reg[index], data->temp8[index]);
- lm90_select_remote_channel(client, data, 0);
+ lm90_select_remote_channel(data, 0);
return err;
}
struct i2c_client *client = data->client;
/* Restore initial configuration */
- i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
- data->convrate_orig);
+ lm90_write_convrate(data, data->convrate_orig);
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
data->config_orig);
}
/*
* Start the conversions.
*/
- lm90_set_convrate(client, data, 500); /* 500ms; 2Hz conversion rate */
config = lm90_read_reg(client, LM90_REG_R_CONFIG1);
if (config < 0)
return config;
data->config_orig = config;
+ data->config = config;
+
+ lm90_set_convrate(client, data, 500); /* 500ms; 2Hz conversion rate */
/* Check Temperature Range Select */
if (data->kind == adt7461 || data->kind == tmp451) {
config &= ~0x08;
config &= 0xBF; /* run */
- if (config != data->config_orig) /* Only write if changed */
- i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
+ lm90_update_confreg(data, config);
return devm_add_action_or_reset(&client->dev, lm90_restore_conf, data);
}
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
- struct i2c_adapter *adapter = to_i2c_adapter(dev->parent);
+ struct i2c_adapter *adapter = client->adapter;
struct hwmon_channel_info *info;
struct regulator *regulator;
struct device *hwmon_dev;
if ((data->flags & LM90_HAVE_BROKEN_ALERT) &&
(alarms & data->alert_alarms)) {
- int config;
-
dev_dbg(&client->dev, "Disabling ALERT#\n");
- config = lm90_read_reg(client, LM90_REG_R_CONFIG1);
- if (config >= 0)
- i2c_smbus_write_byte_data(client,
- LM90_REG_W_CONFIG1,
- config | 0x80);
+ lm90_update_confreg(data, data->config | 0x80);
}
} else {
dev_info(&client->dev, "Everything OK\n");
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