From: Ivo van Doorn <[email protected]>
This patch adds a library for reading from 93cx6 eeproms.
Signed-off-by: Michael Wu <[email protected]>
---
drivers/misc/Kconfig | 6 +
drivers/misc/Makefile | 1
drivers/misc/eeprom_93cx6.c | 226 ++++++++++++++++++++++++++++++++++++++++++
include/linux/eeprom_93cx6.h | 72 +++++++++++++
4 files changed, 305 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 the read command.
+
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..2fd9cfe
--- /dev/null
+++ b/drivers/misc/eeprom_93cx6.c
@@ -0,0 +1,226 @@
+/*
+ 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);
+}
+
+static inline void eeprom_93cx6_pulse_low(struct eeprom_93cx6 *eeprom)
+{
+ eeprom->reg_data_clock = 0;
+ eeprom->register_write(eeprom);
+}
+
+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;
+}
+
+/**
+ * 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);
diff --git a/include/linux/eeprom_93cx6.h b/include/linux/eeprom_93cx6.h
new file mode 100644
index 0000000..d774b77
--- /dev/null
+++ b/include/linux/eeprom_93cx6.h
@@ -0,0 +1,72 @@
+/*
+ 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);
Hi,
> > > The udelay is necessary to set a limit on how fast the eeprom is operated..
> > > but not on all hardware, apparently. adm8211 just uses a read from the eeprom
> > > register to perform the delay.
> >
> > Ok, then I'll update rt2x00 to perform the delay during register_write as well. :)
>
> Actually, see the end of the thread from the previous 93cx6 patch
> Michael posted on Friday. I think these delays are actually alright,
> but they could use a comment. How about the patch below (applied on
> top of the previous version)?
Not a problem, I'll create one for wireless-dev but it should be applicable
for wireless with Michael's patch as well. :)
Ivo
On Monday 14 May 2007 02:49, Ivo Van Doorn wrote:
> For the record: I am still not happy with the removal of the udelay() from
> the pulse methods as they were indicated by the original Ralink code.
> But since I cannot test the effect on Ralink eeprom reading at this time,
> and I could otherwise just add it to the register_write handler if
> required, I am signing this off anyway.
>
The udelay is necessary to set a limit on how fast the eeprom is operated..
but not on all hardware, apparently. adm8211 just uses a read from the eeprom
register to perform the delay.
Thanks,
-Michael Wu
On Mon, May 14, 2007 at 05:00:21PM +0200, Ivo van Doorn wrote:
> On Monday 14 May 2007 16:55, Michael Wu wrote:
> > On Monday 14 May 2007 02:49, Ivo Van Doorn wrote:
> > > For the record: I am still not happy with the removal of the udelay() from
> > > the pulse methods as they were indicated by the original Ralink code.
> > > But since I cannot test the effect on Ralink eeprom reading at this time,
> > > and I could otherwise just add it to the register_write handler if
> > > required, I am signing this off anyway.
> > >
> > The udelay is necessary to set a limit on how fast the eeprom is operated..
> > but not on all hardware, apparently. adm8211 just uses a read from the eeprom
> > register to perform the delay.
>
> Ok, then I'll update rt2x00 to perform the delay during register_write as well. :)
Actually, see the end of the thread from the previous 93cx6 patch
Michael posted on Friday. I think these delays are actually alright,
but they could use a comment. How about the patch below (applied on
top of the previous version)?
John
P.S. No need to repost any 93cx6 patches, I have them.
---
[PATCH] eeprom_93cx6: add comment explaining clocking delays
Signed-off-by: John W. Linville <[email protected]>
diff --git a/drivers/misc/eeprom_93cx6.c b/drivers/misc/eeprom_93cx6.c
index bfcb434..1f615ac 100644
--- a/drivers/misc/eeprom_93cx6.c
+++ b/drivers/misc/eeprom_93cx6.c
@@ -39,6 +39,8 @@ static inline void eeprom_93cx6_pulse_high(struct eeprom_93cx6 *eeprom)
{
eeprom->reg_data_clock = 1;
eeprom->register_write(eeprom);
+
+ /* honor T_ckh hold requirements from datasheet */
udelay(1);
}
@@ -46,6 +48,8 @@ static inline void eeprom_93cx6_pulse_low(struct eeprom_93cx6 *eeprom)
{
eeprom->reg_data_clock = 0;
eeprom->register_write(eeprom);
+
+ /* honor T_ckl hold requirements from datasheet */
udelay(1);
}
--
John W. Linville
[email protected]
On Monday 14 May 2007 16:55, Michael Wu wrote:
> On Monday 14 May 2007 02:49, Ivo Van Doorn wrote:
> > For the record: I am still not happy with the removal of the udelay() from
> > the pulse methods as they were indicated by the original Ralink code.
> > But since I cannot test the effect on Ralink eeprom reading at this time,
> > and I could otherwise just add it to the register_write handler if
> > required, I am signing this off anyway.
> >
> The udelay is necessary to set a limit on how fast the eeprom is operated..
> but not on all hardware, apparently. adm8211 just uses a read from the eeprom
> register to perform the delay.
Ok, then I'll update rt2x00 to perform the delay during register_write as well. :)
Ivo
> From: Ivo van Doorn <[email protected]>
>
> This patch adds a library for reading from 93cx6 eeproms.
>
> Signed-off-by: Michael Wu <[email protected]>
For the record: I am still not happy with the removal of the udelay() from the
pulse methods as they were indicated by the original Ralink code.
But since I cannot test the effect on Ralink eeprom reading at this time,
and I could otherwise just add it to the register_write handler if required,
I am signing this off anyway.
Signed-off-by: Ivo van Doorn <[email protected]>
> ---
>
> drivers/misc/Kconfig | 6 +
> drivers/misc/Makefile | 1
> drivers/misc/eeprom_93cx6.c | 226
> ++++++++++++++++++++++++++++++++++++++++++
> include/linux/eeprom_93cx6.h | 72 +++++++++++++
> 4 files changed, 305 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 the read command.
> +
> 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..2fd9cfe
> --- /dev/null
> +++ b/drivers/misc/eeprom_93cx6.c
> @@ -0,0 +1,226 @@
> +/*
> + 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);
> +}
> +
> +static inline void eeprom_93cx6_pulse_low(struct eeprom_93cx6 *eeprom)
> +{
> + eeprom->reg_data_clock = 0;
> + eeprom->register_write(eeprom);
> +}
> +
> +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;
> +}
> +
> +/**
> + * 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);
> diff --git a/include/linux/eeprom_93cx6.h b/include/linux/eeprom_93cx6.h
> new file mode 100644
> index 0000000..d774b77
> --- /dev/null
> +++ b/include/linux/eeprom_93cx6.h
> @@ -0,0 +1,72 @@
> +/*
> + 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);
>
>