hwmon: (lm90) Rearrange code to no longer require forward declarations
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>hifive-unleashed-5.1
Guenter Roeck
Jean Delvare
parent
06e1c0a216
commit
15b66ab690
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@ -163,21 +163,6 @@ enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
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#define LM90_HAVE_EMERGENCY_ALARM (1 << 5)/* emergency alarm */
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#define LM90_HAVE_TEMP3 (1 << 6) /* 3rd temperature sensor */
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/*
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* Functions declaration
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*/
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static int lm90_detect(struct i2c_client *client, struct i2c_board_info *info);
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static int lm90_probe(struct i2c_client *client,
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const struct i2c_device_id *id);
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static void lm90_init_client(struct i2c_client *client);
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static void lm90_alert(struct i2c_client *client, unsigned int flag);
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static int lm90_remove(struct i2c_client *client);
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static struct lm90_data *lm90_update_device(struct device *dev);
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static inline void lm90_select_remote_channel(struct i2c_client *client,
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struct lm90_data *data,
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int channel);
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/*
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* Driver data (common to all clients)
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*/
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@ -204,19 +189,6 @@ static const struct i2c_device_id lm90_id[] = {
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};
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MODULE_DEVICE_TABLE(i2c, lm90_id);
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static struct i2c_driver lm90_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "lm90",
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},
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.probe = lm90_probe,
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.remove = lm90_remove,
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.alert = lm90_alert,
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.id_table = lm90_id,
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.detect = lm90_detect,
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.address_list = normal_i2c,
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};
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/*
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* Client data (each client gets its own)
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*/
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@ -255,6 +227,209 @@ struct lm90_data {
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u16 alarms; /* bitvector (upper 8 bits for max6695/96) */
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};
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/*
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* Support functions
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*/
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/*
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* The ADM1032 supports PEC but not on write byte transactions, so we need
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* to explicitly ask for a transaction without PEC.
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*/
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static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value)
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{
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return i2c_smbus_xfer(client->adapter, client->addr,
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client->flags & ~I2C_CLIENT_PEC,
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I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
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}
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/*
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* It is assumed that client->update_lock is held (unless we are in
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* detection or initialization steps). This matters when PEC is enabled,
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* because we don't want the address pointer to change between the write
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* byte and the read byte transactions.
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*/
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static int lm90_read_reg(struct i2c_client *client, u8 reg, u8 *value)
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{
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int err;
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if (client->flags & I2C_CLIENT_PEC) {
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err = adm1032_write_byte(client, reg);
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if (err >= 0)
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err = i2c_smbus_read_byte(client);
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} else
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err = i2c_smbus_read_byte_data(client, reg);
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if (err < 0) {
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dev_warn(&client->dev, "Register %#02x read failed (%d)\n",
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reg, err);
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return err;
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}
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*value = err;
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return 0;
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}
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static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value)
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{
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int err;
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u8 oldh, newh, l;
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/*
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* There is a trick here. We have to read two registers to have the
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* sensor temperature, but we have to beware a conversion could occur
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* inbetween the readings. The datasheet says we should either use
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* the one-shot conversion register, which we don't want to do
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* (disables hardware monitoring) or monitor the busy bit, which is
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* impossible (we can't read the values and monitor that bit at the
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* exact same time). So the solution used here is to read the high
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* byte once, then the low byte, then the high byte again. If the new
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* high byte matches the old one, then we have a valid reading. Else
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* we have to read the low byte again, and now we believe we have a
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* correct reading.
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*/
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if ((err = lm90_read_reg(client, regh, &oldh))
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|| (err = lm90_read_reg(client, regl, &l))
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|| (err = lm90_read_reg(client, regh, &newh)))
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return err;
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if (oldh != newh) {
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err = lm90_read_reg(client, regl, &l);
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if (err)
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return err;
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}
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*value = (newh << 8) | l;
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return 0;
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}
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/*
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* client->update_lock must be held when calling this function (unless we are
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* in detection or initialization steps), and while a remote channel other
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* than channel 0 is selected. Also, calling code must make sure to re-select
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* external channel 0 before releasing the lock. This is necessary because
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* various registers have different meanings as a result of selecting a
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* non-default remote channel.
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*/
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static inline void lm90_select_remote_channel(struct i2c_client *client,
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struct lm90_data *data,
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int channel)
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{
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u8 config;
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if (data->kind == max6696) {
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lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
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config &= ~0x08;
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if (channel)
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config |= 0x08;
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i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
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config);
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}
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}
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static struct lm90_data *lm90_update_device(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm90_data *data = i2c_get_clientdata(client);
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->last_updated + HZ / 2 + HZ / 10)
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|| !data->valid) {
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u8 h, l;
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u8 alarms;
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dev_dbg(&client->dev, "Updating lm90 data.\n");
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lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[0]);
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lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[1]);
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lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[2]);
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lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[3]);
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lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst);
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if (data->flags & LM90_HAVE_LOCAL_EXT) {
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lm90_read16(client, LM90_REG_R_LOCAL_TEMP,
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MAX6657_REG_R_LOCAL_TEMPL,
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&data->temp11[4]);
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} else {
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if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP,
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&h) == 0)
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data->temp11[4] = h << 8;
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}
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lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
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LM90_REG_R_REMOTE_TEMPL, &data->temp11[0]);
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if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) {
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data->temp11[1] = h << 8;
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if ((data->flags & LM90_HAVE_REM_LIMIT_EXT)
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&& lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL,
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&l) == 0)
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data->temp11[1] |= l;
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}
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if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) {
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data->temp11[2] = h << 8;
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if ((data->flags & LM90_HAVE_REM_LIMIT_EXT)
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&& lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL,
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&l) == 0)
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data->temp11[2] |= l;
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}
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if (data->flags & LM90_HAVE_OFFSET) {
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if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH,
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&h) == 0
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&& lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL,
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&l) == 0)
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data->temp11[3] = (h << 8) | l;
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}
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if (data->flags & LM90_HAVE_EMERGENCY) {
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lm90_read_reg(client, MAX6659_REG_R_LOCAL_EMERG,
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&data->temp8[4]);
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lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
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&data->temp8[5]);
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}
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lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
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data->alarms = alarms; /* save as 16 bit value */
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if (data->kind == max6696) {
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lm90_select_remote_channel(client, data, 1);
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lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT,
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&data->temp8[6]);
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lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
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&data->temp8[7]);
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lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
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LM90_REG_R_REMOTE_TEMPL, &data->temp11[5]);
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if (!lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h))
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data->temp11[6] = h << 8;
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if (!lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h))
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data->temp11[7] = h << 8;
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lm90_select_remote_channel(client, data, 0);
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if (!lm90_read_reg(client, MAX6696_REG_R_STATUS2,
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&alarms))
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data->alarms |= alarms << 8;
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}
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/* Re-enable ALERT# output if it was originally enabled and
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* relevant alarms are all clear */
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if ((data->config_orig & 0x80) == 0
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&& (data->alarms & data->alert_alarms) == 0) {
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u8 config;
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lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
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if (config & 0x80) {
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dev_dbg(&client->dev, "Re-enabling ALERT#\n");
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i2c_smbus_write_byte_data(client,
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LM90_REG_W_CONFIG1,
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config & ~0x80);
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}
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}
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data->last_updated = jiffies;
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data->valid = 1;
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}
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mutex_unlock(&data->update_lock);
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return data;
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}
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/*
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* Conversions
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* For local temperatures and limits, critical limits and the hysteresis
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@ -770,68 +945,6 @@ static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec);
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* Real code
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*/
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/*
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* The ADM1032 supports PEC but not on write byte transactions, so we need
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* to explicitly ask for a transaction without PEC.
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*/
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static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value)
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{
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return i2c_smbus_xfer(client->adapter, client->addr,
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client->flags & ~I2C_CLIENT_PEC,
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I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
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}
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/*
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* It is assumed that client->update_lock is held (unless we are in
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* detection or initialization steps). This matters when PEC is enabled,
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* because we don't want the address pointer to change between the write
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* byte and the read byte transactions.
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*/
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static int lm90_read_reg(struct i2c_client *client, u8 reg, u8 *value)
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{
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int err;
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if (client->flags & I2C_CLIENT_PEC) {
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err = adm1032_write_byte(client, reg);
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if (err >= 0)
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err = i2c_smbus_read_byte(client);
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} else
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err = i2c_smbus_read_byte_data(client, reg);
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if (err < 0) {
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dev_warn(&client->dev, "Register %#02x read failed (%d)\n",
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reg, err);
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return err;
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}
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*value = err;
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return 0;
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}
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/*
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* client->update_lock must be held when calling this function (unless we are
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* in detection or initialization steps), and while a remote channel other
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* than channel 0 is selected. Also, calling code must make sure to re-select
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* external channel 0 before releasing the lock. This is necessary because
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* various registers have different meanings as a result of selecting a
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* non-default remote channel.
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*/
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static inline void lm90_select_remote_channel(struct i2c_client *client,
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struct lm90_data *data,
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int channel)
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{
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u8 config;
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if (data->kind == max6696) {
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lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
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config &= ~0x08;
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if (channel)
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config |= 0x08;
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i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
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config);
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}
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}
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/* Return 0 if detection is successful, -ENODEV otherwise */
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static int lm90_detect(struct i2c_client *new_client,
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struct i2c_board_info *info)
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@ -1023,6 +1136,47 @@ static void lm90_remove_files(struct i2c_client *client, struct lm90_data *data)
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sysfs_remove_group(&client->dev.kobj, &lm90_group);
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}
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static void lm90_init_client(struct i2c_client *client)
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{
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u8 config;
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struct lm90_data *data = i2c_get_clientdata(client);
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/*
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* Start the conversions.
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*/
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i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
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5); /* 2 Hz */
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if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) {
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dev_warn(&client->dev, "Initialization failed!\n");
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return;
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}
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data->config_orig = config;
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/* Check Temperature Range Select */
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if (data->kind == adt7461) {
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if (config & 0x04)
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data->flags |= LM90_FLAG_ADT7461_EXT;
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}
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/*
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* Put MAX6680/MAX8881 into extended resolution (bit 0x10,
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* 0.125 degree resolution) and range (0x08, extend range
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* to -64 degree) mode for the remote temperature sensor.
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*/
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if (data->kind == max6680)
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config |= 0x18;
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/*
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* Select external channel 0 for max6695/96
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*/
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if (data->kind == max6696)
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config &= ~0x08;
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config &= 0xBF; /* run */
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if (config != data->config_orig) /* Only write if changed */
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i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
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}
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static int lm90_probe(struct i2c_client *new_client,
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const struct i2c_device_id *id)
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{
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@ -1134,47 +1288,6 @@ exit:
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return err;
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}
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static void lm90_init_client(struct i2c_client *client)
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{
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u8 config;
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struct lm90_data *data = i2c_get_clientdata(client);
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/*
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* Start the conversions.
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*/
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i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
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5); /* 2 Hz */
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if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) {
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dev_warn(&client->dev, "Initialization failed!\n");
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return;
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}
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data->config_orig = config;
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/* Check Temperature Range Select */
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if (data->kind == adt7461) {
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if (config & 0x04)
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data->flags |= LM90_FLAG_ADT7461_EXT;
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}
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/*
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* Put MAX6680/MAX8881 into extended resolution (bit 0x10,
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* 0.125 degree resolution) and range (0x08, extend range
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* to -64 degree) mode for the remote temperature sensor.
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*/
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if (data->kind == max6680)
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config |= 0x18;
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/*
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* Select external channel 0 for max6695/96
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*/
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if (data->kind == max6696)
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config &= ~0x08;
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config &= 0xBF; /* run */
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if (config != data->config_orig) /* Only write if changed */
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i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
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}
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static int lm90_remove(struct i2c_client *client)
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{
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struct lm90_data *data = i2c_get_clientdata(client);
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@ -1230,142 +1343,18 @@ static void lm90_alert(struct i2c_client *client, unsigned int flag)
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}
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}
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static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value)
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{
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int err;
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u8 oldh, newh, l;
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/*
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* There is a trick here. We have to read two registers to have the
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* sensor temperature, but we have to beware a conversion could occur
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* inbetween the readings. The datasheet says we should either use
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* the one-shot conversion register, which we don't want to do
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* (disables hardware monitoring) or monitor the busy bit, which is
|
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* impossible (we can't read the values and monitor that bit at the
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* exact same time). So the solution used here is to read the high
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* byte once, then the low byte, then the high byte again. If the new
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* 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)
|
||||
{
|
||||
|
|
|
|||
Loading…
Reference in New Issue