As kind is now hard-coded to -1, there is room for code clean-ups.
Signed-off-by: Jean Delvare <khali@xxxxxxxxxxxx>
---
The patch looks large, but most of it is really only removing one
depth of indentation.
drivers/hwmon/lm90.c | 228 +++++++++++++++++++++-----------------------------
1 file changed, 96 insertions(+), 132 deletions(-)
--- linux-2.6.32-rc3.orig/drivers/hwmon/lm90.c 2009-10-06 10:33:15.000000000 +0200
+++ linux-2.6.32-rc3/drivers/hwmon/lm90.c 2009-10-06 11:54:36.000000000 +0200
@@ -1,7 +1,7 @@
/*
* lm90.c - Part of lm_sensors, Linux kernel modules for hardware
* monitoring
- * Copyright (C) 2003-2008 Jean Delvare <khali@xxxxxxxxxxxx>
+ * Copyright (C) 2003-2009 Jean Delvare <khali@xxxxxxxxxxxx>
*
* 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
{
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;
- } 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 ((reg_config1 & 0x2A) == 0x00
+ && (reg_config2 & 0xF8) == 0x00
+ && reg_convrate <= 0x09) {
+ if (address == 0x4C
+ && (chip_id & 0xF0) == 0x20) { /* LM90 */
+ name = "lm90";
} 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;
+ 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 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;
--
Jean Delvare
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