From 8f67eeb0b44cde19216955975ffef8513a87c0c0 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Fri, 18 Sep 2009 22:45:48 +0200 Subject: i2c/chips: Remove deprecated pcf8575 driver The pcf8575 driver in drivers/i2c/chips which just exports its register to sysfs is superseded by drivers/gpio/pcf857x.c which properly uses the gpiolib. As this driver has been deprecated for more than a year, finally remove it. Signed-off-by: Wolfram Sang Cc: Bart Van Assche Signed-off-by: Jean Delvare --- Documentation/i2c/chips/pcf8575 | 69 ----------------------------------------- 1 file changed, 69 deletions(-) delete mode 100644 Documentation/i2c/chips/pcf8575 (limited to 'Documentation/i2c') diff --git a/Documentation/i2c/chips/pcf8575 b/Documentation/i2c/chips/pcf8575 deleted file mode 100644 index 40b268eb276f..000000000000 --- a/Documentation/i2c/chips/pcf8575 +++ /dev/null @@ -1,69 +0,0 @@ -About the PCF8575 chip and the pcf8575 kernel driver -==================================================== - -The PCF8575 chip is produced by the following manufacturers: - - * Philips NXP - http://www.nxp.com/#/pip/cb=[type=product,path=50807/41735/41850,final=PCF8575_3]|pip=[pip=PCF8575_3][0] - - * Texas Instruments - http://focus.ti.com/docs/prod/folders/print/pcf8575.html - - -Some vendors sell small PCB's with the PCF8575 mounted on it. You can connect -such a board to a Linux host via e.g. an USB to I2C interface. Examples of -PCB boards with a PCF8575: - - * SFE Breakout Board for PCF8575 I2C Expander by RobotShop - http://www.robotshop.ca/home/products/robot-parts/electronics/adapters-converters/sfe-pcf8575-i2c-expander-board.html - - * Breakout Board for PCF8575 I2C Expander by Spark Fun Electronics - http://www.sparkfun.com/commerce/product_info.php?products_id=8130 - - -Description ------------ -The PCF8575 chip is a 16-bit I/O expander for the I2C bus. Up to eight of -these chips can be connected to the same I2C bus. You can find this -chip on some custom designed hardware, but you won't find it on PC -motherboards. - -The PCF8575 chip consists of a 16-bit quasi-bidirectional port and an I2C-bus -interface. Each of the sixteen I/O's can be independently used as an input or -an output. To set up an I/O pin as an input, you have to write a 1 to the -corresponding output. - -For more information please see the datasheet. - - -Detection ---------- - -There is no method known to detect whether a chip on a given I2C address is -a PCF8575 or whether it is any other I2C device, so you have to pass the I2C -bus and address of the installed PCF8575 devices explicitly to the driver at -load time via the force=... parameter. - -/sys interface --------------- - -For each address on which a PCF8575 chip was found or forced the following -files will be created under /sys: -* /sys/bus/i2c/devices/-
/read -* /sys/bus/i2c/devices/-
/write -where bus is the I2C bus number (0, 1, ...) and address is the four-digit -hexadecimal representation of the 7-bit I2C address of the PCF8575 -(0020 .. 0027). - -The read file is read-only. Reading it will trigger an I2C read and will hence -report the current input state for the pins configured as inputs, and the -current output value for the pins configured as outputs. - -The write file is read-write. Writing a value to it will configure all pins -as output for which the corresponding bit is zero. Reading the write file will -return the value last written, or -EAGAIN if no value has yet been written to -the write file. - -On module initialization the configuration of the chip is not changed -- the -chip is left in the state it was already configured in through either power-up -or through previous I2C write actions. -- cgit v1.2.3 From 732d481127abaa0add41ee918191ea08e9ede17e Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Fri, 18 Sep 2009 22:45:48 +0200 Subject: i2c/chips: Remove deprecated pca9539 driver The pca9539 driver in drivers/i2c/chips which just exports its registers to sysfs is superseded by drivers/gpio/pca953x.c which properly uses the gpiolib. As this driver has been deprecated for more than a year, finally remove it. Signed-off-by: Wolfram Sang Acked-by: Ben Gardner Signed-off-by: Jean Delvare --- Documentation/i2c/chips/pca9539 | 58 ----------------------------------------- 1 file changed, 58 deletions(-) delete mode 100644 Documentation/i2c/chips/pca9539 (limited to 'Documentation/i2c') diff --git a/Documentation/i2c/chips/pca9539 b/Documentation/i2c/chips/pca9539 deleted file mode 100644 index 6aff890088b1..000000000000 --- a/Documentation/i2c/chips/pca9539 +++ /dev/null @@ -1,58 +0,0 @@ -Kernel driver pca9539 -===================== - -NOTE: this driver is deprecated and will be dropped soon, use -drivers/gpio/pca9539.c instead. - -Supported chips: - * Philips PCA9539 - Prefix: 'pca9539' - Addresses scanned: none - Datasheet: - http://www.semiconductors.philips.com/acrobat/datasheets/PCA9539_2.pdf - -Author: Ben Gardner - - -Description ------------ - -The Philips PCA9539 is a 16 bit low power I/O device. -All 16 lines can be individually configured as an input or output. -The input sense can also be inverted. -The 16 lines are split between two bytes. - - -Detection ---------- - -The PCA9539 is difficult to detect and not commonly found in PC machines, -so you have to pass the I2C bus and address of the installed PCA9539 -devices explicitly to the driver at load time via the force=... parameter. - - -Sysfs entries -------------- - -Each is a byte that maps to the 8 I/O bits. -A '0' suffix is for bits 0-7, while '1' is for bits 8-15. - -input[01] - read the current value -output[01] - sets the output value -direction[01] - direction of each bit: 1=input, 0=output -invert[01] - toggle the input bit sense - -input reads the actual state of the line and is always available. -The direction defaults to input for all channels. - - -General Remarks ---------------- - -Note that each output, direction, and invert entry controls 8 lines. -You should use the read, modify, write sequence. -For example. to set output bit 0 of 1. - val=$(cat output0) - val=$(( $val | 1 )) - echo $val > output0 - -- cgit v1.2.3 From e7c5c49ecdac6dc5a6b67a27838b1b562eeec1b9 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Fri, 18 Sep 2009 22:45:49 +0200 Subject: i2c/chips: Remove deprecated pcf8574 driver The pcf8574 driver in drivers/i2c/chips which just exports its register to sysfs is superseded by drivers/gpio/pcf857x.c which properly uses the gpiolib. As this driver has been deprecated for more than a year, finally remove it. Signed-off-by: Wolfram Sang Cc: Aurelien Jarno Signed-off-by: Jean Delvare --- Documentation/i2c/chips/pcf8574 | 65 ----------------------------------------- 1 file changed, 65 deletions(-) delete mode 100644 Documentation/i2c/chips/pcf8574 (limited to 'Documentation/i2c') diff --git a/Documentation/i2c/chips/pcf8574 b/Documentation/i2c/chips/pcf8574 deleted file mode 100644 index 235815c075ff..000000000000 --- a/Documentation/i2c/chips/pcf8574 +++ /dev/null @@ -1,65 +0,0 @@ -Kernel driver pcf8574 -===================== - -Supported chips: - * Philips PCF8574 - Prefix: 'pcf8574' - Addresses scanned: none - Datasheet: Publicly available at the Philips Semiconductors website - http://www.semiconductors.philips.com/pip/PCF8574P.html - - * Philips PCF8574A - Prefix: 'pcf8574a' - Addresses scanned: none - Datasheet: Publicly available at the Philips Semiconductors website - http://www.semiconductors.philips.com/pip/PCF8574P.html - -Authors: - Frodo Looijaard , - Philip Edelbrock , - Dan Eaton , - Aurelien Jarno , - Jean Delvare , - - -Description ------------ -The PCF8574(A) is an 8-bit I/O expander for the I2C bus produced by Philips -Semiconductors. It is designed to provide a byte I2C interface to up to 16 -separate devices (8 x PCF8574 and 8 x PCF8574A). - -This device consists of a quasi-bidirectional port. Each of the eight I/Os -can be independently used as an input or output. To setup an I/O as an -input, you have to write a 1 to the corresponding output. - -For more informations see the datasheet. - - -Accessing PCF8574(A) via /sys interface -------------------------------------- - -The PCF8574(A) is plainly impossible to detect ! Stupid chip. -So, you have to pass the I2C bus and address of the installed PCF857A -and PCF8574A devices explicitly to the driver at load time via the -force=... parameter. - -On detection (i.e. insmod, modprobe et al.), directories are being -created for each detected PCF8574(A): - -/sys/bus/i2c/devices/<0>-<1>/ -where <0> is the bus the chip was detected on (e. g. i2c-0) -and <1> the chip address ([20..27] or [38..3f]): - -(example: /sys/bus/i2c/devices/1-0020/) - -Inside these directories, there are two files each: -read and write (and one file with chip name). - -The read file is read-only. Reading gives you the current I/O input -if the corresponding output is set as 1, otherwise the current output -value, that is to say 0. - -The write file is read/write. Writing a value outputs it on the I/O -port. Reading returns the last written value. As it is not possible -to read this value from the chip, you need to write at least once to -this file before you can read back from it. -- cgit v1.2.3 From 76b3e28fa728bb68895cbd8375f5ce233bd891de Mon Sep 17 00:00:00 2001 From: Crane Cai Date: Fri, 18 Sep 2009 22:45:50 +0200 Subject: i2c-piix4: Add AMD SB900 SMBus device ID Add new SMBus device ID for AMD SB900. Signed-off-by: Crane Cai Signed-off-by: Jean Delvare --- Documentation/i2c/busses/i2c-piix4 | 2 ++ 1 file changed, 2 insertions(+) (limited to 'Documentation/i2c') diff --git a/Documentation/i2c/busses/i2c-piix4 b/Documentation/i2c/busses/i2c-piix4 index f889481762b5..c5b37c570554 100644 --- a/Documentation/i2c/busses/i2c-piix4 +++ b/Documentation/i2c/busses/i2c-piix4 @@ -8,6 +8,8 @@ Supported adapters: Datasheet: Only available via NDA from ServerWorks * ATI IXP200, IXP300, IXP400, SB600, SB700 and SB800 southbridges Datasheet: Not publicly available + * AMD SB900 + Datasheet: Not publicly available * Standard Microsystems (SMSC) SLC90E66 (Victory66) southbridge Datasheet: Publicly available at the SMSC website http://www.smsc.com -- cgit v1.2.3 From f546c65cd59275c7b95eba4f9b3ab83b38a5e9cb Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Sun, 4 Oct 2009 22:53:40 +0200 Subject: i2c: Move misc devices documentation Some times ago the eeprom and max6875 drivers moved to drivers/misc/eeprom, but their documentation did not follow. It's finally time to get rid of Documentation/i2c/chips. Signed-off-by: Jean Delvare Cc: Ben Gardner Acked-by: Wolfram Sang --- Documentation/i2c/chips/eeprom | 96 ----------------------------------- Documentation/i2c/chips/max6875 | 108 ---------------------------------------- 2 files changed, 204 deletions(-) delete mode 100644 Documentation/i2c/chips/eeprom delete mode 100644 Documentation/i2c/chips/max6875 (limited to 'Documentation/i2c') diff --git a/Documentation/i2c/chips/eeprom b/Documentation/i2c/chips/eeprom deleted file mode 100644 index f7e8104b5764..000000000000 --- a/Documentation/i2c/chips/eeprom +++ /dev/null @@ -1,96 +0,0 @@ -Kernel driver eeprom -==================== - -Supported chips: - * Any EEPROM chip in the designated address range - Prefix: 'eeprom' - Addresses scanned: I2C 0x50 - 0x57 - Datasheets: Publicly available from: - Atmel (www.atmel.com), - Catalyst (www.catsemi.com), - Fairchild (www.fairchildsemi.com), - Microchip (www.microchip.com), - Philips (www.semiconductor.philips.com), - Rohm (www.rohm.com), - ST (www.st.com), - Xicor (www.xicor.com), - and others. - - Chip Size (bits) Address - 24C01 1K 0x50 (shadows at 0x51 - 0x57) - 24C01A 1K 0x50 - 0x57 (Typical device on DIMMs) - 24C02 2K 0x50 - 0x57 - 24C04 4K 0x50, 0x52, 0x54, 0x56 - (additional data at 0x51, 0x53, 0x55, 0x57) - 24C08 8K 0x50, 0x54 (additional data at 0x51, 0x52, - 0x53, 0x55, 0x56, 0x57) - 24C16 16K 0x50 (additional data at 0x51 - 0x57) - Sony 2K 0x57 - - Atmel 34C02B 2K 0x50 - 0x57, SW write protect at 0x30-37 - Catalyst 34FC02 2K 0x50 - 0x57, SW write protect at 0x30-37 - Catalyst 34RC02 2K 0x50 - 0x57, SW write protect at 0x30-37 - Fairchild 34W02 2K 0x50 - 0x57, SW write protect at 0x30-37 - Microchip 24AA52 2K 0x50 - 0x57, SW write protect at 0x30-37 - ST M34C02 2K 0x50 - 0x57, SW write protect at 0x30-37 - - -Authors: - Frodo Looijaard , - Philip Edelbrock , - Jean Delvare , - Greg Kroah-Hartman , - IBM Corp. - -Description ------------ - -This is a simple EEPROM module meant to enable reading the first 256 bytes -of an EEPROM (on a SDRAM DIMM for example). However, it will access serial -EEPROMs on any I2C adapter. The supported devices are generically called -24Cxx, and are listed above; however the numbering for these -industry-standard devices may vary by manufacturer. - -This module was a programming exercise to get used to the new project -organization laid out by Frodo, but it should be at least completely -effective for decoding the contents of EEPROMs on DIMMs. - -DIMMS will typically contain a 24C01A or 24C02, or the 34C02 variants. -The other devices will not be found on a DIMM because they respond to more -than one address. - -DDC Monitors may contain any device. Often a 24C01, which responds to all 8 -addresses, is found. - -Recent Sony Vaio laptops have an EEPROM at 0x57. We couldn't get the -specification, so it is guess work and far from being complete. - -The Microchip 24AA52/24LCS52, ST M34C02, and others support an additional -software write protect register at 0x30 - 0x37 (0x20 less than the memory -location). The chip responds to "write quick" detection at this address but -does not respond to byte reads. If this register is present, the lower 128 -bytes of the memory array are not write protected. Any byte data write to -this address will write protect the memory array permanently, and the -device will no longer respond at the 0x30-37 address. The eeprom driver -does not support this register. - -Lacking functionality: - -* Full support for larger devices (24C04, 24C08, 24C16). These are not -typically found on a PC. These devices will appear as separate devices at -multiple addresses. - -* Support for really large devices (24C32, 24C64, 24C128, 24C256, 24C512). -These devices require two-byte address fields and are not supported. - -* Enable Writing. Again, no technical reason why not, but making it easy -to change the contents of the EEPROMs (on DIMMs anyway) also makes it easy -to disable the DIMMs (potentially preventing the computer from booting) -until the values are restored somehow. - -Use: - -After inserting the module (and any other required SMBus/i2c modules), you -should have some EEPROM directories in /sys/bus/i2c/devices/* of names such -as "0-0050". Inside each of these is a series of files, the eeprom file -contains the binary data from EEPROM. diff --git a/Documentation/i2c/chips/max6875 b/Documentation/i2c/chips/max6875 deleted file mode 100644 index 10ca43cd1a72..000000000000 --- a/Documentation/i2c/chips/max6875 +++ /dev/null @@ -1,108 +0,0 @@ -Kernel driver max6875 -===================== - -Supported chips: - * Maxim MAX6874, MAX6875 - Prefix: 'max6875' - Addresses scanned: None (see below) - Datasheet: - http://pdfserv.maxim-ic.com/en/ds/MAX6874-MAX6875.pdf - -Author: Ben Gardner - - -Description ------------ - -The Maxim MAX6875 is an EEPROM-programmable power-supply sequencer/supervisor. -It provides timed outputs that can be used as a watchdog, if properly wired. -It also provides 512 bytes of user EEPROM. - -At reset, the MAX6875 reads the configuration EEPROM into its configuration -registers. The chip then begins to operate according to the values in the -registers. - -The Maxim MAX6874 is a similar, mostly compatible device, with more intputs -and outputs: - vin gpi vout -MAX6874 6 4 8 -MAX6875 4 3 5 - -See the datasheet for more information. - - -Sysfs entries -------------- - -eeprom - 512 bytes of user-defined EEPROM space. - - -General Remarks ---------------- - -Valid addresses for the MAX6875 are 0x50 and 0x52. -Valid addresses for the MAX6874 are 0x50, 0x52, 0x54 and 0x56. -The driver does not probe any address, so you must force the address. - -Example: -$ modprobe max6875 force=0,0x50 - -The MAX6874/MAX6875 ignores address bit 0, so this driver attaches to multiple -addresses. For example, for address 0x50, it also reserves 0x51. -The even-address instance is called 'max6875', the odd one is 'dummy'. - - -Programming the chip using i2c-dev ----------------------------------- - -Use the i2c-dev interface to access and program the chips. -Reads and writes are performed differently depending on the address range. - -The configuration registers are at addresses 0x00 - 0x45. -Use i2c_smbus_write_byte_data() to write a register and -i2c_smbus_read_byte_data() to read a register. -The command is the register number. - -Examples: -To write a 1 to register 0x45: - i2c_smbus_write_byte_data(fd, 0x45, 1); - -To read register 0x45: - value = i2c_smbus_read_byte_data(fd, 0x45); - - -The configuration EEPROM is at addresses 0x8000 - 0x8045. -The user EEPROM is at addresses 0x8100 - 0x82ff. - -Use i2c_smbus_write_word_data() to write a byte to EEPROM. - -The command is the upper byte of the address: 0x80, 0x81, or 0x82. -The data word is the lower part of the address or'd with data << 8. - cmd = address >> 8; - val = (address & 0xff) | (data << 8); - -Example: -To write 0x5a to address 0x8003: - i2c_smbus_write_word_data(fd, 0x80, 0x5a03); - - -Reading data from the EEPROM is a little more complicated. -Use i2c_smbus_write_byte_data() to set the read address and then -i2c_smbus_read_byte() or i2c_smbus_read_i2c_block_data() to read the data. - -Example: -To read data starting at offset 0x8100, first set the address: - i2c_smbus_write_byte_data(fd, 0x81, 0x00); - -And then read the data - value = i2c_smbus_read_byte(fd); - - or - - count = i2c_smbus_read_i2c_block_data(fd, 0x84, 16, buffer); - -The block read should read 16 bytes. -0x84 is the block read command. - -See the datasheet for more details. - -- cgit v1.2.3 From 03f1805ad0ce5aae02bfe40c29b230abb63179ac Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Sun, 4 Oct 2009 22:53:45 +0200 Subject: i2c: Minor documentation update The sysfs path to i2c adapters has changed recently, update the documentation to reflect that change. Signed-off-by: Jean Delvare --- Documentation/i2c/instantiating-devices | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'Documentation/i2c') diff --git a/Documentation/i2c/instantiating-devices b/Documentation/i2c/instantiating-devices index c740b7b41088..e89490270aba 100644 --- a/Documentation/i2c/instantiating-devices +++ b/Documentation/i2c/instantiating-devices @@ -188,7 +188,7 @@ segment, the address is sufficient to uniquely identify the device to be deleted. Example: -# echo eeprom 0x50 > /sys/class/i2c-adapter/i2c-3/new_device +# echo eeprom 0x50 > /sys/bus/i2c/devices/i2c-3/new_device While this interface should only be used when in-kernel device declaration can't be done, there is a variety of cases where it can be helpful: -- cgit v1.2.3