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hwmon: (lm90) Clean up detect function 

As kind is now hard-coded to -1, there is room for code clean-ups.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
hifive-unleashed-5.1
Jean Delvare 2009-12-09 20:35:53 +01:00
parent d42a2eb5ad
commit 8f2fa77c53
1 changed files with 95 additions and 131 deletions
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226
drivers/hwmon/lm90.c
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@ -1,7 +1,7 @@
/*
* lm90.c - Part of lm_sensors, Linux kernel modules for hardware
* monitoring
* Copyright (C) 2003-2008 Jean Delvare <khali@linux-fr.org>
* Copyright (C) 2003-2009 Jean Delvare <khali@linux-fr.org>
*
* Based on the lm83 driver. The LM90 is a sensor chip made by National
* Semiconductor. It reports up to two temperatures (its own plus up to
@ -661,154 +661,118 @@ static int lm90_detect(struct i2c_client *new_client, int kind,
{
struct i2c_adapter *adapter = new_client->adapter;
int address = new_client->addr;
const char *name = "";
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;
/*
* Now we do the remaining detection. A negative kind means that
* the driver was loaded with no force parameter (default), so we
* must both detect and identify the chip. A zero kind means that
* the driver was loaded with the force parameter, the detection
* step shall be skipped. A positive kind means that the driver
* was loaded with the force parameter and a given kind of chip is
* requested, so both the detection and the identification steps
* are skipped.
*/
/* Default to an LM90 if forced */
if (kind == 0)
kind = lm90;
if (kind < 0) { /* detection and identification */
int man_id, chip_id, reg_config1, reg_convrate;
if ((man_id = i2c_smbus_read_byte_data(new_client,
/* detection and identification */
if ((man_id = i2c_smbus_read_byte_data(new_client,
LM90_REG_R_MAN_ID)) < 0
|| (chip_id = i2c_smbus_read_byte_data(new_client,
|| (chip_id = i2c_smbus_read_byte_data(new_client,
LM90_REG_R_CHIP_ID)) < 0
|| (reg_config1 = i2c_smbus_read_byte_data(new_client,
|| (reg_config1 = i2c_smbus_read_byte_data(new_client,
LM90_REG_R_CONFIG1)) < 0
|| (reg_convrate = i2c_smbus_read_byte_data(new_client,
|| (reg_convrate = i2c_smbus_read_byte_data(new_client,
LM90_REG_R_CONVRATE)) < 0)
return -ENODEV;
if ((address == 0x4C || address == 0x4D)
&& man_id == 0x01) { /* National Semiconductor */
int reg_config2;
reg_config2 = i2c_smbus_read_byte_data(new_client,
LM90_REG_R_CONFIG2);
if (reg_config2 < 0)
return -ENODEV;
if ((address == 0x4C || address == 0x4D)
&& man_id == 0x01) { /* National Semiconductor */
int reg_config2;
if ((reg_config2 = i2c_smbus_read_byte_data(new_client,
LM90_REG_R_CONFIG2)) < 0)
return -ENODEV;
if ((reg_config1 & 0x2A) == 0x00
&& (reg_config2 & 0xF8) == 0x00
&& reg_convrate <= 0x09) {
if (address == 0x4C
&& (chip_id & 0xF0) == 0x20) { /* LM90 */
kind = lm90;
} else
if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */
kind = lm99;
dev_info(&adapter->dev,
"Assuming LM99 chip at "
"0x%02x\n", address);
dev_info(&adapter->dev,
"If it is an LM89, pass "
"force_lm86=%d,0x%02x when "
"loading the lm90 driver\n",
i2c_adapter_id(adapter),
address);
} else
if (address == 0x4C
&& (chip_id & 0xF0) == 0x10) { /* LM86 */
kind = lm86;
}
}
} else
if ((address == 0x4C || address == 0x4D)
&& man_id == 0x41) { /* Analog Devices */
if ((chip_id & 0xF0) == 0x40 /* ADM1032 */
&& (reg_config1 & 0x3F) == 0x00
&& reg_convrate <= 0x0A) {
kind = adm1032;
if ((reg_config1 & 0x2A) == 0x00
&& (reg_config2 & 0xF8) == 0x00
&& reg_convrate <= 0x09) {
if (address == 0x4C
&& (chip_id & 0xF0) == 0x20) { /* LM90 */
name = "lm90";
} else
if (chip_id == 0x51 /* ADT7461 */
&& (reg_config1 & 0x1B) == 0x00
&& reg_convrate <= 0x0A) {
kind = adt7461;
}
} else
if (man_id == 0x4D) { /* Maxim */
/*
* The MAX6657, MAX6658 and MAX6659 do NOT have a
* chip_id register. Reading from that address will
* return the last read value, which in our case is
* those of the man_id register. Likewise, the config1
* register seems to lack a low nibble, so the value
* will be those of the previous read, so in our case
* those of the man_id register.
*/
if (chip_id == man_id
&& (address == 0x4C || address == 0x4D)
&& (reg_config1 & 0x1F) == (man_id & 0x0F)
&& reg_convrate <= 0x09) {
kind = max6657;
if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */
name = "lm99";
dev_info(&adapter->dev,
"Assuming LM99 chip at 0x%02x\n",
address);
dev_info(&adapter->dev,
"If it is an LM89, instantiate it "
"with the new_device sysfs "
"interface\n");
} else
/* The chip_id register of the MAX6680 and MAX6681
* holds the revision of the chip.
* the lowest bit of the config1 register is unused
* and should return zero when read, so should the
* second to last bit of config1 (software reset)
*/
if (chip_id == 0x01
&& (reg_config1 & 0x03) == 0x00
&& reg_convrate <= 0x07) {
kind = max6680;
} else
/* The chip_id register of the MAX6646/6647/6649
* holds the revision of the chip.
* The lowest 6 bits of the config1 register are
* unused and should return zero when read.
*/
if (chip_id == 0x59
&& (reg_config1 & 0x3f) == 0x00
&& reg_convrate <= 0x07) {
kind = max6646;
if (address == 0x4C
&& (chip_id & 0xF0) == 0x10) { /* LM86 */
name = "lm86";
}
}
if (kind <= 0) { /* identification failed */
dev_dbg(&adapter->dev,
"Unsupported chip at 0x%02x (man_id=0x%02X, "
"chip_id=0x%02X)\n", address, man_id, chip_id);
return -ENODEV;
} else
if ((address == 0x4C || address == 0x4D)
&& man_id == 0x41) { /* Analog Devices */
if ((chip_id & 0xF0) == 0x40 /* ADM1032 */
&& (reg_config1 & 0x3F) == 0x00
&& reg_convrate <= 0x0A) {
name = "adm1032";
/* The ADM1032 supports PEC, but only if combined
transactions are not used. */
if (i2c_check_functionality(adapter,
I2C_FUNC_SMBUS_BYTE))
info->flags |= I2C_CLIENT_PEC;
} else
if (chip_id == 0x51 /* ADT7461 */
&& (reg_config1 & 0x1B) == 0x00
&& reg_convrate <= 0x0A) {
name = "adt7461";
}
} else
if (man_id == 0x4D) { /* Maxim */
/*
* The MAX6657, MAX6658 and MAX6659 do NOT have a chip_id
* register. Reading from that address will return the last
* read value, which in our case is those of the man_id
* register. Likewise, the config1 register seems to lack a
* low nibble, so the value will be those of the previous
* read, so in our case those of the man_id register.
*/
if (chip_id == man_id
&& (address == 0x4C || address == 0x4D)
&& (reg_config1 & 0x1F) == (man_id & 0x0F)
&& reg_convrate <= 0x09) {
name = "max6657";
} else
/*
* The chip_id register of the MAX6680 and MAX6681 holds the
* revision of the chip. The lowest bit of the config1 register
* is unused and should return zero when read, so should the
* second to last bit of config1 (software reset).
*/
if (chip_id == 0x01
&& (reg_config1 & 0x03) == 0x00
&& reg_convrate <= 0x07) {
name = "max6680";
} else
/*
* The chip_id register of the MAX6646/6647/6649 holds the
* revision of the chip. The lowest 6 bits of the config1
* register are unused and should return zero when read.
*/
if (chip_id == 0x59
&& (reg_config1 & 0x3f) == 0x00
&& reg_convrate <= 0x07) {
name = "max6646";
}
}
/* Fill the i2c board info */
if (kind == lm90) {
name = "lm90";
} else if (kind == adm1032) {
name = "adm1032";
/* The ADM1032 supports PEC, but only if combined
transactions are not used. */
if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
info->flags |= I2C_CLIENT_PEC;
} else if (kind == lm99) {
name = "lm99";
} else if (kind == lm86) {
name = "lm86";
} else if (kind == max6657) {
name = "max6657";
} else if (kind == max6680) {
name = "max6680";
} else if (kind == adt7461) {
name = "adt7461";
} else if (kind == max6646) {
name = "max6646";
if (!name) { /* identification failed */
dev_dbg(&adapter->dev,
"Unsupported chip at 0x%02x (man_id=0x%02X, "
"chip_id=0x%02X)\n", address, man_id, chip_id);
return -ENODEV;
}
strlcpy(info->type, name, I2C_NAME_SIZE);
return 0;