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https://github.com/adulau/aha.git
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[PATCH] Add 93cx6 eeprom library
This patch adds a library for reading from 93cx6 eeproms. Signed-off-by: Michael Wu <flamingice@sourmilk.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ivo van Doorn
Jeff Garzik
parent
7dcca30a32
commit
9467d64b0e
4 changed files with 307 additions and 1 deletions
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@ -34,6 +34,11 @@ config PHANTOM
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If you choose to build module, its name will be phantom. If unsure,
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say N here.
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config EEPROM_93CX6
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tristate "EEPROM 93CX6 support"
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---help---
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This is a driver for the EEPROM chipsets 93c46 and 93c66.
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The driver supports both read as well as write commands.
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If unsure, say N.
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@ -187,5 +192,4 @@ config THINKPAD_ACPI_BAY
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If you are not sure, say Y here.
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endmenu
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@ -14,3 +14,4 @@ obj-$(CONFIG_PHANTOM) += phantom.o
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obj-$(CONFIG_SGI_IOC4) += ioc4.o
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obj-$(CONFIG_SONY_LAPTOP) += sony-laptop.o
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obj-$(CONFIG_THINKPAD_ACPI) += thinkpad_acpi.o
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obj-$(CONFIG_EEPROM_93CX6) += eeprom_93cx6.o
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229
drivers/misc/eeprom_93cx6.c
Normal file
229
drivers/misc/eeprom_93cx6.c
Normal file
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@ -0,0 +1,229 @@
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/*
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Copyright (C) 2004 - 2006 rt2x00 SourceForge Project
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<http://rt2x00.serialmonkey.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the
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Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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Module: eeprom_93cx6
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Abstract: EEPROM reader routines for 93cx6 chipsets.
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Supported chipsets: 93c46 & 93c66.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/delay.h>
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#include <linux/eeprom_93cx6.h>
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MODULE_AUTHOR("http://rt2x00.serialmonkey.com");
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MODULE_VERSION("1.0");
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MODULE_DESCRIPTION("EEPROM 93cx6 chip driver");
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MODULE_LICENSE("GPL");
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static inline void eeprom_93cx6_pulse_high(struct eeprom_93cx6 *eeprom)
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{
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eeprom->reg_data_clock = 1;
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eeprom->register_write(eeprom);
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udelay(1);
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}
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static inline void eeprom_93cx6_pulse_low(struct eeprom_93cx6 *eeprom)
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{
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eeprom->reg_data_clock = 0;
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eeprom->register_write(eeprom);
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udelay(1);
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}
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static void eeprom_93cx6_startup(struct eeprom_93cx6 *eeprom)
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{
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/*
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* Clear all flags, and enable chip select.
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*/
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eeprom->register_read(eeprom);
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eeprom->reg_data_in = 0;
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eeprom->reg_data_out = 0;
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eeprom->reg_data_clock = 0;
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eeprom->reg_chip_select = 1;
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eeprom->register_write(eeprom);
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/*
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* kick a pulse.
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*/
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eeprom_93cx6_pulse_high(eeprom);
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eeprom_93cx6_pulse_low(eeprom);
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}
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static void eeprom_93cx6_cleanup(struct eeprom_93cx6 *eeprom)
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{
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/*
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* Clear chip_select and data_in flags.
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*/
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eeprom->register_read(eeprom);
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eeprom->reg_data_in = 0;
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eeprom->reg_chip_select = 0;
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eeprom->register_write(eeprom);
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/*
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* kick a pulse.
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*/
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eeprom_93cx6_pulse_high(eeprom);
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eeprom_93cx6_pulse_low(eeprom);
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}
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static void eeprom_93cx6_write_bits(struct eeprom_93cx6 *eeprom,
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const u16 data, const u16 count)
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{
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unsigned int i;
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eeprom->register_read(eeprom);
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/*
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* Clear data flags.
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*/
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eeprom->reg_data_in = 0;
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eeprom->reg_data_out = 0;
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/*
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* Start writing all bits.
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*/
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for (i = count; i > 0; i--) {
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/*
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* Check if this bit needs to be set.
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*/
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eeprom->reg_data_in = !!(data & (1 << (i - 1)));
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/*
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* Write the bit to the eeprom register.
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*/
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eeprom->register_write(eeprom);
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/*
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* Kick a pulse.
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*/
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eeprom_93cx6_pulse_high(eeprom);
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eeprom_93cx6_pulse_low(eeprom);
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}
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eeprom->reg_data_in = 0;
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eeprom->register_write(eeprom);
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}
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static void eeprom_93cx6_read_bits(struct eeprom_93cx6 *eeprom,
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u16 *data, const u16 count)
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{
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unsigned int i;
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u16 buf = 0;
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eeprom->register_read(eeprom);
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/*
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* Clear data flags.
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*/
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eeprom->reg_data_in = 0;
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eeprom->reg_data_out = 0;
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/*
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* Start reading all bits.
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*/
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for (i = count; i > 0; i--) {
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eeprom_93cx6_pulse_high(eeprom);
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eeprom->register_read(eeprom);
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/*
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* Clear data_in flag.
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*/
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eeprom->reg_data_in = 0;
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/*
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* Read if the bit has been set.
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*/
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if (eeprom->reg_data_out)
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buf |= (1 << (i - 1));
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eeprom_93cx6_pulse_low(eeprom);
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}
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*data = buf;
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}
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/**
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* eeprom_93cx6_read - Read multiple words from eeprom
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* @eeprom: Pointer to eeprom structure
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* @word: Word index from where we should start reading
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* @data: target pointer where the information will have to be stored
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*
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* This function will read the eeprom data as host-endian word
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* into the given data pointer.
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*/
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void eeprom_93cx6_read(struct eeprom_93cx6 *eeprom, const u8 word,
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u16 *data)
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{
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u16 command;
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/*
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* Initialize the eeprom register
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*/
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eeprom_93cx6_startup(eeprom);
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/*
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* Select the read opcode and the word to be read.
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*/
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command = (PCI_EEPROM_READ_OPCODE << eeprom->width) | word;
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eeprom_93cx6_write_bits(eeprom, command,
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PCI_EEPROM_WIDTH_OPCODE + eeprom->width);
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/*
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* Read the requested 16 bits.
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*/
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eeprom_93cx6_read_bits(eeprom, data, 16);
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/*
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* Cleanup eeprom register.
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*/
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eeprom_93cx6_cleanup(eeprom);
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}
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EXPORT_SYMBOL_GPL(eeprom_93cx6_read);
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/**
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* eeprom_93cx6_multiread - Read multiple words from eeprom
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* @eeprom: Pointer to eeprom structure
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* @word: Word index from where we should start reading
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* @data: target pointer where the information will have to be stored
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* @words: Number of words that should be read.
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*
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* This function will read all requested words from the eeprom,
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* this is done by calling eeprom_93cx6_read() multiple times.
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* But with the additional change that while the eeprom_93cx6_read
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* will return host ordered bytes, this method will return little
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* endian words.
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*/
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void eeprom_93cx6_multiread(struct eeprom_93cx6 *eeprom, const u8 word,
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__le16 *data, const u16 words)
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{
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unsigned int i;
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u16 tmp;
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for (i = 0; i < words; i++) {
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tmp = 0;
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eeprom_93cx6_read(eeprom, word + i, &tmp);
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data[i] = cpu_to_le16(tmp);
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}
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}
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EXPORT_SYMBOL_GPL(eeprom_93cx6_multiread);
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72
include/linux/eeprom_93cx6.h
Normal file
72
include/linux/eeprom_93cx6.h
Normal file
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@ -0,0 +1,72 @@
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/*
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Copyright (C) 2004 - 2006 rt2x00 SourceForge Project
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<http://rt2x00.serialmonkey.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the
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Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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Module: eeprom_93cx6
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Abstract: EEPROM reader datastructures for 93cx6 chipsets.
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Supported chipsets: 93c46 & 93c66.
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*/
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/*
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* EEPROM operation defines.
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*/
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#define PCI_EEPROM_WIDTH_93C46 6
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#define PCI_EEPROM_WIDTH_93C66 8
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#define PCI_EEPROM_WIDTH_OPCODE 3
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#define PCI_EEPROM_WRITE_OPCODE 0x05
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#define PCI_EEPROM_READ_OPCODE 0x06
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#define PCI_EEPROM_EWDS_OPCODE 0x10
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#define PCI_EEPROM_EWEN_OPCODE 0x13
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/**
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* struct eeprom_93cx6 - control structure for setting the commands
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* for reading the eeprom data.
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* @data: private pointer for the driver.
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* @register_read(struct eeprom_93cx6 *eeprom): handler to
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* read the eeprom register, this function should set all reg_* fields.
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* @register_write(struct eeprom_93cx6 *eeprom): handler to
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* write to the eeprom register by using all reg_* fields.
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* @width: eeprom width, should be one of the PCI_EEPROM_WIDTH_* defines
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* @reg_data_in: register field to indicate data input
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* @reg_data_out: register field to indicate data output
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* @reg_data_clock: register field to set the data clock
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* @reg_chip_select: register field to set the chip select
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*
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* This structure is used for the communication between the driver
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* and the eeprom_93cx6 handlers for reading the eeprom.
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*/
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struct eeprom_93cx6 {
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void *data;
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void (*register_read)(struct eeprom_93cx6 *eeprom);
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void (*register_write)(struct eeprom_93cx6 *eeprom);
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int width;
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char reg_data_in;
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char reg_data_out;
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char reg_data_clock;
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char reg_chip_select;
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};
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extern void eeprom_93cx6_read(struct eeprom_93cx6 *eeprom,
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const u8 word, u16 *data);
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extern void eeprom_93cx6_multiread(struct eeprom_93cx6 *eeprom,
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const u8 word, __le16 *data, const u16 words);
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