#define LM90_HAVE_EMERGENCY_ALARM (1 << 5)/* emergency alarm */
#define LM90_HAVE_TEMP3 (1 << 6) /* 3rd temperature sensor */
-/*
- * Functions declaration
- */
-
-static int lm90_detect(struct i2c_client *client, struct i2c_board_info *info);
-static int lm90_probe(struct i2c_client *client,
- const struct i2c_device_id *id);
-static void lm90_init_client(struct i2c_client *client);
-static void lm90_alert(struct i2c_client *client, unsigned int flag);
-static int lm90_remove(struct i2c_client *client);
-static struct lm90_data *lm90_update_device(struct device *dev);
-static inline void lm90_select_remote_channel(struct i2c_client *client,
- struct lm90_data *data,
- int channel);
-
/*
* Driver data (common to all clients)
*/
};
MODULE_DEVICE_TABLE(i2c, lm90_id);
-static struct i2c_driver lm90_driver = {
- .class = I2C_CLASS_HWMON,
- .driver = {
- .name = "lm90",
- },
- .probe = lm90_probe,
- .remove = lm90_remove,
- .alert = lm90_alert,
- .id_table = lm90_id,
- .detect = lm90_detect,
- .address_list = normal_i2c,
-};
-
/*
* Client data (each client gets its own)
*/
u16 alarms; /* bitvector (upper 8 bits for max6695/96) */
};
+/*
+ * Support functions
+ */
+
+/*
+ * The ADM1032 supports PEC but not on write byte transactions, so we need
+ * to explicitly ask for a transaction without PEC.
+ */
+static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value)
+{
+ return i2c_smbus_xfer(client->adapter, client->addr,
+ client->flags & ~I2C_CLIENT_PEC,
+ I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
+}
+
+/*
+ * It is assumed that client->update_lock is held (unless we are in
+ * detection or initialization steps). This matters when PEC is enabled,
+ * because we don't want the address pointer to change between the write
+ * byte and the read byte transactions.
+ */
+static int lm90_read_reg(struct i2c_client *client, u8 reg, u8 *value)
+{
+ int err;
+
+ if (client->flags & I2C_CLIENT_PEC) {
+ err = adm1032_write_byte(client, reg);
+ if (err >= 0)
+ err = i2c_smbus_read_byte(client);
+ } else
+ err = i2c_smbus_read_byte_data(client, reg);
+
+ if (err < 0) {
+ dev_warn(&client->dev, "Register %#02x read failed (%d)\n",
+ reg, err);
+ return err;
+ }
+ *value = err;
+
+ return 0;
+}
+
+static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value)
+{
+ int err;
+ u8 oldh, newh, l;
+
+ /*
+ * There is a trick here. We have to read two registers to have the
+ * sensor temperature, but we have to beware a conversion could occur
+ * inbetween the readings. The datasheet says we should either use
+ * the one-shot conversion register, which we don't want to do
+ * (disables hardware monitoring) or monitor the busy bit, which is
+ * impossible (we can't read the values and monitor that bit at the
+ * exact same time). So the solution used here is to read the high
+ * byte once, then the low byte, then the high byte again. If the new
+ * high byte matches the old one, then we have a valid reading. Else
+ * we have to read the low byte again, and now we believe we have a
+ * correct reading.
+ */
+ if ((err = lm90_read_reg(client, regh, &oldh))
+ || (err = lm90_read_reg(client, regl, &l))
+ || (err = lm90_read_reg(client, regh, &newh)))
+ return err;
+ if (oldh != newh) {
+ err = lm90_read_reg(client, regl, &l);
+ if (err)
+ return err;
+ }
+ *value = (newh << 8) | l;
+
+ 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
+ * than channel 0 is selected. Also, calling code must make sure to re-select
+ * external channel 0 before releasing the lock. This is necessary because
+ * various registers have different meanings as a result of selecting a
+ * non-default remote channel.
+ */
+static inline void lm90_select_remote_channel(struct i2c_client *client,
+ struct lm90_data *data,
+ int channel)
+{
+ u8 config;
+
+ if (data->kind == max6696) {
+ lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
+ config &= ~0x08;
+ if (channel)
+ config |= 0x08;
+ i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
+ config);
+ }
+}
+
+static struct lm90_data *lm90_update_device(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lm90_data *data = i2c_get_clientdata(client);
+
+ mutex_lock(&data->update_lock);
+
+ if (time_after(jiffies, data->last_updated + HZ / 2 + HZ / 10)
+ || !data->valid) {
+ u8 h, l;
+ u8 alarms;
+
+ dev_dbg(&client->dev, "Updating lm90 data.\n");
+ lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[0]);
+ lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[1]);
+ lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[2]);
+ lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[3]);
+ lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst);
+
+ if (data->flags & LM90_HAVE_LOCAL_EXT) {
+ lm90_read16(client, LM90_REG_R_LOCAL_TEMP,
+ MAX6657_REG_R_LOCAL_TEMPL,
+ &data->temp11[4]);
+ } else {
+ if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP,
+ &h) == 0)
+ data->temp11[4] = h << 8;
+ }
+ lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
+ LM90_REG_R_REMOTE_TEMPL, &data->temp11[0]);
+
+ if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) {
+ data->temp11[1] = h << 8;
+ if ((data->flags & LM90_HAVE_REM_LIMIT_EXT)
+ && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL,
+ &l) == 0)
+ data->temp11[1] |= l;
+ }
+ if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) {
+ data->temp11[2] = h << 8;
+ if ((data->flags & LM90_HAVE_REM_LIMIT_EXT)
+ && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL,
+ &l) == 0)
+ data->temp11[2] |= l;
+ }
+
+ if (data->flags & LM90_HAVE_OFFSET) {
+ if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH,
+ &h) == 0
+ && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL,
+ &l) == 0)
+ data->temp11[3] = (h << 8) | l;
+ }
+ if (data->flags & LM90_HAVE_EMERGENCY) {
+ lm90_read_reg(client, MAX6659_REG_R_LOCAL_EMERG,
+ &data->temp8[4]);
+ lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
+ &data->temp8[5]);
+ }
+ lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
+ data->alarms = alarms; /* save as 16 bit value */
+
+ if (data->kind == max6696) {
+ lm90_select_remote_channel(client, data, 1);
+ lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT,
+ &data->temp8[6]);
+ lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
+ &data->temp8[7]);
+ lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
+ LM90_REG_R_REMOTE_TEMPL, &data->temp11[5]);
+ if (!lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h))
+ data->temp11[6] = h << 8;
+ if (!lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h))
+ data->temp11[7] = h << 8;
+ lm90_select_remote_channel(client, data, 0);
+
+ if (!lm90_read_reg(client, MAX6696_REG_R_STATUS2,
+ &alarms))
+ data->alarms |= alarms << 8;
+ }
+
+ /* Re-enable ALERT# output if it was originally enabled and
+ * relevant alarms are all clear */
+ if ((data->config_orig & 0x80) == 0
+ && (data->alarms & data->alert_alarms) == 0) {
+ u8 config;
+
+ lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
+ if (config & 0x80) {
+ dev_dbg(&client->dev, "Re-enabling ALERT#\n");
+ i2c_smbus_write_byte_data(client,
+ LM90_REG_W_CONFIG1,
+ config & ~0x80);
+ }
+ }
+
+ data->last_updated = jiffies;
+ data->valid = 1;
+ }
+
+ mutex_unlock(&data->update_lock);
+
+ return data;
+}
+
/*
* Conversions
* For local temperatures and limits, critical limits and the hysteresis
* Real code
*/
-/*
- * The ADM1032 supports PEC but not on write byte transactions, so we need
- * to explicitly ask for a transaction without PEC.
- */
-static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value)
-{
- return i2c_smbus_xfer(client->adapter, client->addr,
- client->flags & ~I2C_CLIENT_PEC,
- I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
-}
-
-/*
- * It is assumed that client->update_lock is held (unless we are in
- * detection or initialization steps). This matters when PEC is enabled,
- * because we don't want the address pointer to change between the write
- * byte and the read byte transactions.
- */
-static int lm90_read_reg(struct i2c_client *client, u8 reg, u8 *value)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int lm90_detect(struct i2c_client *new_client,
+ struct i2c_board_info *info)
{
- int err;
+ struct i2c_adapter *adapter = new_client->adapter;
+ int address = new_client->addr;
+ const char *name = NULL;
+ int man_id, chip_id, reg_config1, reg_convrate;
- if (client->flags & I2C_CLIENT_PEC) {
- err = adm1032_write_byte(client, reg);
- if (err >= 0)
- err = i2c_smbus_read_byte(client);
- } else
- err = i2c_smbus_read_byte_data(client, reg);
-
- if (err < 0) {
- dev_warn(&client->dev, "Register %#02x read failed (%d)\n",
- reg, err);
- return err;
- }
- *value = err;
-
- 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
- * than channel 0 is selected. Also, calling code must make sure to re-select
- * external channel 0 before releasing the lock. This is necessary because
- * various registers have different meanings as a result of selecting a
- * non-default remote channel.
- */
-static inline void lm90_select_remote_channel(struct i2c_client *client,
- struct lm90_data *data,
- int channel)
-{
- u8 config;
-
- if (data->kind == max6696) {
- lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
- config &= ~0x08;
- if (channel)
- config |= 0x08;
- i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
- config);
- }
-}
-
-/* Return 0 if detection is successful, -ENODEV otherwise */
-static int lm90_detect(struct i2c_client *new_client,
- struct i2c_board_info *info)
-{
- struct i2c_adapter *adapter = new_client->adapter;
- int address = new_client->addr;
- const char *name = NULL;
- int man_id, chip_id, reg_config1, reg_convrate;
-
- if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
- return -ENODEV;
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
/* detection and identification */
if ((man_id = i2c_smbus_read_byte_data(new_client,
sysfs_remove_group(&client->dev.kobj, &lm90_group);
}
+static void lm90_init_client(struct i2c_client *client)
+{
+ u8 config;
+ struct lm90_data *data = i2c_get_clientdata(client);
+
+ /*
+ * Start the conversions.
+ */
+ i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
+ 5); /* 2 Hz */
+ if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) {
+ dev_warn(&client->dev, "Initialization failed!\n");
+ return;
+ }
+ data->config_orig = config;
+
+ /* Check Temperature Range Select */
+ if (data->kind == adt7461) {
+ if (config & 0x04)
+ data->flags |= LM90_FLAG_ADT7461_EXT;
+ }
+
+ /*
+ * Put MAX6680/MAX8881 into extended resolution (bit 0x10,
+ * 0.125 degree resolution) and range (0x08, extend range
+ * to -64 degree) mode for the remote temperature sensor.
+ */
+ if (data->kind == max6680)
+ config |= 0x18;
+
+ /*
+ * Select external channel 0 for max6695/96
+ */
+ if (data->kind == max6696)
+ 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);
+}
+
static int lm90_probe(struct i2c_client *new_client,
const struct i2c_device_id *id)
{
return err;
}
-static void lm90_init_client(struct i2c_client *client)
-{
- u8 config;
- struct lm90_data *data = i2c_get_clientdata(client);
-
- /*
- * Start the conversions.
- */
- i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
- 5); /* 2 Hz */
- if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) {
- dev_warn(&client->dev, "Initialization failed!\n");
- return;
- }
- data->config_orig = config;
-
- /* Check Temperature Range Select */
- if (data->kind == adt7461) {
- if (config & 0x04)
- data->flags |= LM90_FLAG_ADT7461_EXT;
- }
-
- /*
- * Put MAX6680/MAX8881 into extended resolution (bit 0x10,
- * 0.125 degree resolution) and range (0x08, extend range
- * to -64 degree) mode for the remote temperature sensor.
- */
- if (data->kind == max6680)
- config |= 0x18;
-
- /*
- * Select external channel 0 for max6695/96
- */
- if (data->kind == max6696)
- 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);
-}
-
static int lm90_remove(struct i2c_client *client)
{
struct lm90_data *data = i2c_get_clientdata(client);
}
}
-static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value)
-{
- int err;
- u8 oldh, newh, l;
-
- /*
- * There is a trick here. We have to read two registers to have the
- * sensor temperature, but we have to beware a conversion could occur
- * inbetween the readings. The datasheet says we should either use
- * the one-shot conversion register, which we don't want to do
- * (disables hardware monitoring) or monitor the busy bit, which is
- * impossible (we can't read the values and monitor that bit at the
- * exact same time). So the solution used here is to read the high
- * byte once, then the low byte, then the high byte again. If the new
- * high byte matches the old one, then we have a valid reading. Else
- * we have to read the low byte again, and now we believe we have a
- * correct reading.
- */
- if ((err = lm90_read_reg(client, regh, &oldh))
- || (err = lm90_read_reg(client, regl, &l))
- || (err = lm90_read_reg(client, regh, &newh)))
- return err;
- if (oldh != newh) {
- err = lm90_read_reg(client, regl, &l);
- if (err)
- return err;
- }
- *value = (newh << 8) | l;
-
- return 0;
-}
-
-static struct lm90_data *lm90_update_device(struct device *dev)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct lm90_data *data = i2c_get_clientdata(client);
-
- mutex_lock(&data->update_lock);
-
- if (time_after(jiffies, data->last_updated + HZ / 2 + HZ / 10)
- || !data->valid) {
- u8 h, l;
- u8 alarms;
-
- dev_dbg(&client->dev, "Updating lm90 data.\n");
- lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[0]);
- lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[1]);
- lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[2]);
- lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[3]);
- lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst);
-
- if (data->flags & LM90_HAVE_LOCAL_EXT) {
- lm90_read16(client, LM90_REG_R_LOCAL_TEMP,
- MAX6657_REG_R_LOCAL_TEMPL,
- &data->temp11[4]);
- } else {
- if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP,
- &h) == 0)
- data->temp11[4] = h << 8;
- }
- lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
- LM90_REG_R_REMOTE_TEMPL, &data->temp11[0]);
-
- if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) {
- data->temp11[1] = h << 8;
- if ((data->flags & LM90_HAVE_REM_LIMIT_EXT)
- && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL,
- &l) == 0)
- data->temp11[1] |= l;
- }
- if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) {
- data->temp11[2] = h << 8;
- if ((data->flags & LM90_HAVE_REM_LIMIT_EXT)
- && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL,
- &l) == 0)
- data->temp11[2] |= l;
- }
-
- if (data->flags & LM90_HAVE_OFFSET) {
- if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH,
- &h) == 0
- && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL,
- &l) == 0)
- data->temp11[3] = (h << 8) | l;
- }
- if (data->flags & LM90_HAVE_EMERGENCY) {
- lm90_read_reg(client, MAX6659_REG_R_LOCAL_EMERG,
- &data->temp8[4]);
- lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
- &data->temp8[5]);
- }
- lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
- data->alarms = alarms; /* save as 16 bit value */
-
- if (data->kind == max6696) {
- lm90_select_remote_channel(client, data, 1);
- lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT,
- &data->temp8[6]);
- lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
- &data->temp8[7]);
- lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
- LM90_REG_R_REMOTE_TEMPL, &data->temp11[5]);
- if (!lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h))
- data->temp11[6] = h << 8;
- if (!lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h))
- data->temp11[7] = h << 8;
- lm90_select_remote_channel(client, data, 0);
-
- if (!lm90_read_reg(client, MAX6696_REG_R_STATUS2,
- &alarms))
- data->alarms |= alarms << 8;
- }
-
- /* Re-enable ALERT# output if it was originally enabled and
- * relevant alarms are all clear */
- if ((data->config_orig & 0x80) == 0
- && (data->alarms & data->alert_alarms) == 0) {
- u8 config;
-
- lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
- if (config & 0x80) {
- dev_dbg(&client->dev, "Re-enabling ALERT#\n");
- i2c_smbus_write_byte_data(client,
- LM90_REG_W_CONFIG1,
- config & ~0x80);
- }
- }
-
- data->last_updated = jiffies;
- data->valid = 1;
- }
-
- mutex_unlock(&data->update_lock);
-
- return data;
-}
+static struct i2c_driver lm90_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "lm90",
+ },
+ .probe = lm90_probe,
+ .remove = lm90_remove,
+ .alert = lm90_alert,
+ .id_table = lm90_id,
+ .detect = lm90_detect,
+ .address_list = normal_i2c,
+};
static int __init sensors_lm90_init(void)
{
projects / openwrt / staging / blogic.git / commitdiff