diff options
| -rw-r--r-- | Documentation/hwmon/pcf8591 | 18 | ||||
| -rw-r--r-- | drivers/hwmon/pcf8591.c | 26 |
2 files changed, 8 insertions, 36 deletions
diff --git a/Documentation/hwmon/pcf8591 b/Documentation/hwmon/pcf8591 index e76a7892f68e..ac020b3bb7b3 100644 --- a/Documentation/hwmon/pcf8591 +++ b/Documentation/hwmon/pcf8591 @@ -4,7 +4,7 @@ Kernel driver pcf8591 Supported chips: * Philips/NXP PCF8591 Prefix: 'pcf8591' - Addresses scanned: I2C 0x48 - 0x4f + Addresses scanned: none Datasheet: Publicly available at the NXP website http://www.nxp.com/pip/PCF8591_6.html @@ -58,18 +58,16 @@ Module parameters Accessing PCF8591 via /sys interface ------------------------------------- -! Be careful ! -The PCF8591 is plainly impossible to detect! Stupid chip. -So every chip with address in the interval [0x48..0x4f] is -detected as PCF8591. If you have other chips in this address -range, the workaround is to load this module after the one -for your others chips. +The PCF8591 is plainly impossible to detect! Thus the driver won't even +try. You have to explicitly instantiate the device at the relevant +address (in the interval [0x48..0x4f]) either through platform data, or +using the sysfs interface. See Documentation/i2c/instantiating-devices +for details. -On detection (i.e. insmod, modprobe et al.), directories are being -created for each detected PCF8591: +Directories are being created for each instantiated PCF8591: /sys/bus/i2c/devices/<0>-<1>/ -where <0> is the bus the chip was detected on (e. g. i2c-0) +where <0> is the bus the chip is connected to (e. g. i2c-0) and <1> the chip address ([48..4f]) Inside these directories, there are such files: diff --git a/drivers/hwmon/pcf8591.c b/drivers/hwmon/pcf8591.c index d7df0e6c1ef4..dc7259d69812 100644 --- a/drivers/hwmon/pcf8591.c +++ b/drivers/hwmon/pcf8591.c @@ -26,10 +26,6 @@ #include <linux/err.h> #include <linux/hwmon.h> -/* Addresses to scan */ -static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, - 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; - /* Insmod parameters */ static int input_mode; @@ -170,24 +166,6 @@ static const struct attribute_group pcf8591_attr_group_opt = { * Real code */ -/* Return 0 if detection is successful, -ENODEV otherwise */ -static int pcf8591_detect(struct i2c_client *client, - struct i2c_board_info *info) -{ - struct i2c_adapter *adapter = client->adapter; - - if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE - | I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) - return -ENODEV; - - /* Now, we would do the remaining detection. But the PCF8591 is plainly - impossible to detect! Stupid chip. */ - - strlcpy(info->type, "pcf8591", I2C_NAME_SIZE); - - return 0; -} - static int pcf8591_probe(struct i2c_client *client, const struct i2c_device_id *id) { @@ -307,10 +285,6 @@ static struct i2c_driver pcf8591_driver = { .probe = pcf8591_probe, .remove = pcf8591_remove, .id_table = pcf8591_id, - - .class = I2C_CLASS_HWMON, /* Nearest choice */ - .detect = pcf8591_detect, - .address_list = normal_i2c, }; static int __init pcf8591_init(void) |