On Mon, May 07, 2007 at 03:46:04AM -0400, Michael Wu wrote: > From: Ivo van Doorn <ivdoorn@xxxxxxxxx> > > This patch adds a library for reading from and writing to 93cx6 eeproms. This looks remarkably like an SPI device, why not use the spi framework to drive this? > Signed-off-by: Michael Wu <flamingice@xxxxxxxxxxxx> > --- > > drivers/misc/Kconfig | 6 + > drivers/misc/Makefile | 1 > drivers/misc/eeprom_93cx6.c | 347 ++++++++++++++++++++++++++++++++++++++++++ > include/linux/eeprom_93cx6.h | 77 +++++++++ > 4 files changed, 431 insertions(+), 0 deletions(-) > > diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig > index a3c525b..607a180 100644 > --- a/drivers/misc/Kconfig > +++ b/drivers/misc/Kconfig > @@ -178,4 +178,10 @@ config THINKPAD_ACPI_BAY > > If you are not sure, say Y here. > > +config EEPROM_93CX6 > + tristate "EEPROM 93CX6 support" > + ---help--- > + This is a driver for the EEPROM chipsets 93c46 and 93c66. > + The driver supports both read as well as write commands. > + > endmenu > diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile > index e325164..42b34a9 100644 > --- a/drivers/misc/Makefile > +++ b/drivers/misc/Makefile > @@ -13,3 +13,4 @@ obj-$(CONFIG_TIFM_7XX1) += tifm_7 > obj-$(CONFIG_SGI_IOC4) += ioc4.o > obj-$(CONFIG_SONY_LAPTOP) += sony-laptop.o > obj-$(CONFIG_THINKPAD_ACPI) += thinkpad_acpi.o > +obj-$(CONFIG_EEPROM_93CX6) += eeprom_93cx6.o > diff --git a/drivers/misc/eeprom_93cx6.c b/drivers/misc/eeprom_93cx6.c > new file mode 100644 > index 0000000..a948ddc > --- /dev/null > +++ b/drivers/misc/eeprom_93cx6.c > @@ -0,0 +1,347 @@ > +/* > + Copyright (C) 2004 - 2006 rt2x00 SourceForge Project > + <http://rt2x00.serialmonkey.com> > + > + This program is free software; you can redistribute it and/or modify > + it under the terms of the GNU General Public License as published by > + the Free Software Foundation; either version 2 of the License, or > + (at your option) any later version. > + > + This program is distributed in the hope that it will be useful, > + but WITHOUT ANY WARRANTY; without even the implied warranty of > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + GNU General Public License for more details. > + > + You should have received a copy of the GNU General Public License > + along with this program; if not, write to the > + Free Software Foundation, Inc., > + 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. > + */ > + > +/* > + Module: eeprom_93cx6 > + Abstract: EEPROM reader routines for 93cx6 chipsets. > + Supported chipsets: 93c46 & 93c66. > + */ > + > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/version.h> > +#include <linux/delay.h> > +#include <linux/eeprom_93cx6.h> > + > +MODULE_AUTHOR("http://rt2x00.serialmonkey.com";); > +MODULE_VERSION("1.0"); > +MODULE_DESCRIPTION("EEPROM 93cx6 chip driver"); > +MODULE_LICENSE("GPL"); > + > +static inline void eeprom_93cx6_pulse_high(struct eeprom_93cx6 *eeprom) > +{ > + eeprom->reg_data_clock = 1; > + eeprom->register_write(eeprom); > + udelay(1); > +} > + > +static inline void eeprom_93cx6_pulse_low(struct eeprom_93cx6 *eeprom) > +{ > + eeprom->reg_data_clock = 0; > + eeprom->register_write(eeprom); > + udelay(1); > +} > + > +static void eeprom_93cx6_startup(struct eeprom_93cx6 *eeprom) > +{ > + /* > + * Clear all flags, and enable chip select. > + */ > + eeprom->register_read(eeprom); > + eeprom->reg_data_in = 0; > + eeprom->reg_data_out = 0; > + eeprom->reg_data_clock = 0; > + eeprom->reg_chip_select = 1; > + eeprom->register_write(eeprom); > + > + /* > + * kick a pulse. > + */ > + eeprom_93cx6_pulse_high(eeprom); > + eeprom_93cx6_pulse_low(eeprom); > +} > + > +static void eeprom_93cx6_cleanup(struct eeprom_93cx6 *eeprom) > +{ > + /* > + * Clear chip_select and data_in flags. > + */ > + eeprom->register_read(eeprom); > + eeprom->reg_data_in = 0; > + eeprom->reg_chip_select = 0; > + eeprom->register_write(eeprom); > + > + /* > + * kick a pulse. > + */ > + eeprom_93cx6_pulse_high(eeprom); > + eeprom_93cx6_pulse_low(eeprom); > +} > + > +static void eeprom_93cx6_write_bits(struct eeprom_93cx6 *eeprom, > + const u16 data, const u16 count) > +{ > + unsigned int i; > + > + eeprom->register_read(eeprom); > + > + /* > + * Clear data flags. > + */ > + eeprom->reg_data_in = 0; > + eeprom->reg_data_out = 0; > + > + /* > + * Start writing all bits. > + */ > + for (i = count; i > 0; i--) { > + /* > + * Check if this bit needs to be set. > + */ > + eeprom->reg_data_in = !!(data & (1 << (i - 1))); > + > + /* > + * Write the bit to the eeprom register. > + */ > + eeprom->register_write(eeprom); > + > + /* > + * Kick a pulse. > + */ > + eeprom_93cx6_pulse_high(eeprom); > + eeprom_93cx6_pulse_low(eeprom); > + } > + > + eeprom->reg_data_in = 0; > + eeprom->register_write(eeprom); > +} > + > +static void eeprom_93cx6_read_bits(struct eeprom_93cx6 *eeprom, > + u16 *data, const u16 count) > +{ > + unsigned int i; > + u16 buf = 0; > + > + eeprom->register_read(eeprom); > + > + /* > + * Clear data flags. > + */ > + eeprom->reg_data_in = 0; > + eeprom->reg_data_out = 0; > + > + /* > + * Start reading all bits. > + */ > + for (i = count; i > 0; i--) { > + eeprom_93cx6_pulse_high(eeprom); > + > + eeprom->register_read(eeprom); > + > + /* > + * Clear data_in flag. > + */ > + eeprom->reg_data_in = 0; > + > + /* > + * Read if the bit has been set. > + */ > + if (eeprom->reg_data_out) > + buf |= (1 << (i - 1)); > + > + eeprom_93cx6_pulse_low(eeprom); > + } > + > + *data = buf; > +} > + > +static void eeprom_93cx6_ewen(struct eeprom_93cx6 *eeprom) > +{ > + /* > + * Initialize the eeprom register > + */ > + eeprom_93cx6_startup(eeprom); > + > + /* > + * Select the read opcode and the word to be read. > + */ > + eeprom_93cx6_write_bits(eeprom, PCI_EEPROM_EWEN_OPCODE, 5); > + eeprom_93cx6_write_bits(eeprom, 0, 6); > + > + /* > + * Cleanup eeprom register. > + */ > + eeprom_93cx6_cleanup(eeprom); > +} > + > +static void eeprom_93cx6_ewds(struct eeprom_93cx6 *eeprom) > +{ > + /* > + * Initialize the eeprom register > + */ > + eeprom_93cx6_startup(eeprom); > + > + /* > + * Select the read opcode and the word to be read. > + */ > + eeprom_93cx6_write_bits(eeprom, PCI_EEPROM_EWDS_OPCODE, 5); > + eeprom_93cx6_write_bits(eeprom, 0, 6); > + > + /* > + * Cleanup eeprom register. > + */ > + eeprom_93cx6_cleanup(eeprom); > +} > + > +/** > + * eeprom_93cx6_read - Read multiple words from eeprom > + * @eeprom: Pointer to eeprom structure > + * @word: Word index from where we should start reading > + * @data: target pointer where the information will have to be stored > + * > + * This function will read the eeprom data as host-endian word > + * into the given data pointer. > + */ > +void eeprom_93cx6_read(struct eeprom_93cx6 *eeprom, const u8 word, > + u16 *data) > +{ > + u16 command; > + > + /* > + * Initialize the eeprom register > + */ > + eeprom_93cx6_startup(eeprom); > + > + /* > + * Select the read opcode and the word to be read. > + */ > + command = (PCI_EEPROM_READ_OPCODE << eeprom->width) | word; > + eeprom_93cx6_write_bits(eeprom, command, > + PCI_EEPROM_WIDTH_OPCODE + eeprom->width); > + > + /* > + * Read the requested 16 bits. > + */ > + eeprom_93cx6_read_bits(eeprom, data, 16); > + > + /* > + * Cleanup eeprom register. > + */ > + eeprom_93cx6_cleanup(eeprom); > +} > +EXPORT_SYMBOL_GPL(eeprom_93cx6_read); > + > +/** > + * eeprom_93cx6_multiread - Read multiple words from eeprom > + * @eeprom: Pointer to eeprom structure > + * @word: Word index from where we should start reading > + * @data: target pointer where the information will have to be stored > + * @words: Number of words that should be read. > + * > + * This function will read all requested words from the eeprom, > + * this is done by calling eeprom_93cx6_read() multiple times. > + * But with the additional change that while the eeprom_93cx6_read > + * will return host ordered bytes, this method will return little > + * endian words. > + */ > +void eeprom_93cx6_multiread(struct eeprom_93cx6 *eeprom, const u8 word, > + __le16 *data, const u16 words) > +{ > + unsigned int i; > + u16 tmp; > + > + for (i = 0; i < words; i++) { > + tmp = 0; > + eeprom_93cx6_read(eeprom, word + i, &tmp); > + data[i] = cpu_to_le16(tmp); > + } > +} > +EXPORT_SYMBOL_GPL(eeprom_93cx6_multiread); > + > +/** > + * eeprom_93cx6_write - Write multiple words to the eeprom > + * @eeprom: Pointer to eeprom structure > + * @word: Word index from where we should start writing > + * @data: Data that will be written > + * > + * This function will write the eeprom data as host-endian word > + * from the given data pointer. > + */ > +void eeprom_93cx6_write(struct eeprom_93cx6 *eeprom, const u8 word, > + u16 data) > +{ > + u16 command; > + > + /* > + * select the ewen opcode. > + */ > + eeprom_93cx6_ewen(eeprom); > + > + /* > + * Initialize the eeprom register > + */ > + eeprom_93cx6_startup(eeprom); > + > + /* > + * Select the write opcode and the word to be read. > + */ > + command = (PCI_EEPROM_WRITE_OPCODE << eeprom->width) | word; > + eeprom_93cx6_write_bits(eeprom, command, > + PCI_EEPROM_WIDTH_OPCODE + eeprom->width); > + > + /* > + * Write the requested 16 bits. > + */ > + eeprom_93cx6_write_bits(eeprom, data, 16); > + > + /* > + * Cleanup eeprom register. > + */ > + eeprom_93cx6_cleanup(eeprom); > + > + /* > + * Take a short break. > + */ > + msleep(10000); > + > + /* > + * select the ewen opcode. > + */ > + eeprom_93cx6_ewds(eeprom); > + > + /* > + * Cleanup eeprom register. > + */ > + eeprom_93cx6_cleanup(eeprom); > +} > +EXPORT_SYMBOL_GPL(eeprom_93cx6_write); > + > + > +/** > + * eeprom_93cx6_multiwrite - Write multiple words to the eeprom > + * @eeprom: Pointer to eeprom structure > + * @word: Word index from where we should start writing > + * @data: Pointer where the information will be read from > + * @words: Number of words that should be written. > + * > + * This function will write all requested words to the eeprom, > + * this is done by calling eeprom_93cx6_write() multiple times. > + * This method accepts little endian data, so it will first be > + * converted into host endian. > + */ > +void eeprom_93cx6_multiwrite(struct eeprom_93cx6 *eeprom, const u8 word, > + __le16 *data, const u16 words) > +{ > + unsigned int i; > + > + for (i = 0; i < words; i++) > + eeprom_93cx6_write(eeprom, word + i, le16_to_cpu(data[i])); > +} > +EXPORT_SYMBOL_GPL(eeprom_93cx6_multiwrite); > diff --git a/include/linux/eeprom_93cx6.h b/include/linux/eeprom_93cx6.h > new file mode 100644 > index 0000000..4b9be59 > --- /dev/null > +++ b/include/linux/eeprom_93cx6.h > @@ -0,0 +1,77 @@ > +/* > + Copyright (C) 2004 - 2006 rt2x00 SourceForge Project > + <http://rt2x00.serialmonkey.com> > + > + This program is free software; you can redistribute it and/or modify > + it under the terms of the GNU General Public License as published by > + the Free Software Foundation; either version 2 of the License, or > + (at your option) any later version. > + > + This program is distributed in the hope that it will be useful, > + but WITHOUT ANY WARRANTY; without even the implied warranty of > + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + GNU General Public License for more details. > + > + You should have received a copy of the GNU General Public License > + along with this program; if not, write to the > + Free Software Foundation, Inc., > + 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. > + */ > + > +/* > + Module: eeprom_93cx6 > + Abstract: EEPROM reader datastructures for 93cx6 chipsets. > + Supported chipsets: 93c46 & 93c66. > + */ > + > +/* > + * EEPROM operation defines. > + */ > +#define PCI_EEPROM_WIDTH_93C46 6 > +#define PCI_EEPROM_WIDTH_93C66 8 > +#define PCI_EEPROM_WIDTH_OPCODE 3 > +#define PCI_EEPROM_WRITE_OPCODE 0x05 > +#define PCI_EEPROM_READ_OPCODE 0x06 > +#define PCI_EEPROM_EWDS_OPCODE 0x10 > +#define PCI_EEPROM_EWEN_OPCODE 0x13 > + > +/** > + * struct eeprom_93cx6 - control structure for setting the commands > + * for reading the eeprom data. > + * @data: private pointer for the driver. > + * @register_read(struct eeprom_93cx6 *eeprom): handler to > + * read the eeprom register, this function should set all reg_* fields. > + * @register_write(struct eeprom_93cx6 *eeprom): handler to > + * write to the eeprom register by using all reg_* fields. > + * @width: eeprom width, should be one of the PCI_EEPROM_WIDTH_* defines > + * @reg_data_in: register field to indicate data input > + * @reg_data_out: register field to indicate data output > + * @reg_data_clock: register field to set the data clock > + * @reg_chip_select: register field to set the chip select > + * > + * This structure is used for the communication between the driver > + * and the eeprom_93cx6 handlers for reading the eeprom. > + */ > +struct eeprom_93cx6 { > + void *data; > + > + void (*register_read)(struct eeprom_93cx6 *eeprom); > + void (*register_write)(struct eeprom_93cx6 *eeprom); > + > + int width; > + > + char reg_data_in; > + char reg_data_out; > + char reg_data_clock; > + char reg_chip_select; > +}; > + > +extern void eeprom_93cx6_read(struct eeprom_93cx6 *eeprom, > + const u8 word, u16 *data); > +extern void eeprom_93cx6_multiread(struct eeprom_93cx6 *eeprom, > + const u8 word, __le16 *data, const u16 words); > + > +extern void eeprom_93cx6_write(struct eeprom_93cx6 *eeprom, > + const u8 word, u16 data); > +extern void eeprom_93cx6_multiwrite(struct eeprom_93cx6 *eeprom, > + const u8 word, __le16 *data, const u16 words); > > - > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Ben (ben@xxxxxxxxx, http://www.fluff.org/) 'a smiley only costs 4 bytes' - To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
