Re: [PATCH] PCI and I2C fixes for 2.6.8

Greg KH
2004-08-23T18:52:13Z

ChangeSet 1.1807.59.9, 2004/08/05 16:46:18-07:00, icampbell@arcom.com

[PATCH] I2C: algorithm and bus driver for PCA9564

Attached is a driver for the PCA9564 "Parallel to I2C" chip, it is
similar in principle to the PCF8584 which is supported by the
i2c-algo-pcf and i2c-elektor code, however it's not code compatible in
any way: http://www.semiconductors.philips.com/pip/PCA9564PW.html

The patch contains the PCA algorithm driver and a bus driver for an ISA
card. It only supports master send and receive but I'm not sure that the
Linux i2c stack supports client side operation anyhow, and I have no
hardware to test on.

It was tested on a PC104 card containing the PCA chip and an Atmel TPM
device and also on a separate PC104 card with a DS1307 RTC hotwired onto
it for testing purposes.

The driver is against a 2.6 BK tree pulled on Friday. I also have a
fairly trivial 2.4 backport if that is of interest.

From: Ian Campbell <icampbell@arcom.com>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/i2c/algos/Kconfig | 11 +
drivers/i2c/algos/Makefile | 1
drivers/i2c/algos/i2c-algo-pca.c | 395 +++++++++++++++++++++++++++++++++++++++
drivers/i2c/algos/i2c-algo-pca.h | 26 ++
drivers/i2c/busses/Kconfig | 11 +
drivers/i2c/busses/Makefile | 1
drivers/i2c/busses/i2c-pca-isa.c | 184 ++++++++++++++++++
include/linux/i2c-algo-pca.h | 17 +
include/linux/i2c-id.h | 4
9 files changed, 650 insertions(+)

diff -Nru a/drivers/i2c/algos/Kconfig b/drivers/i2c/algos/Kconfig
--- a/drivers/i2c/algos/Kconfig 2004-08-23 11:04:47 -07:00
+++ b/drivers/i2c/algos/Kconfig 2004-08-23 11:04:47 -07:00
@@ -27,6 +27,17 @@
This support is also available as a module. If so, the module
will be called i2c-algo-pcf.

+config I2C_ALGOPCA
+ tristate "I2C PCA 9564 interfaces"
+ depends on I2C
+ help
+ This allows you to use a range of I2C adapters called PCA adapters.
+ Say Y if you own an I2C adapter belonging to this class and then say
+ Y to the specific driver for you adapter below.
+
+ This support is also available as a module. If so, the module
+ will be called i2c-algo-pca.
+
config I2C_ALGOITE
tristate "ITE I2C Algorithm"
depends on MIPS_ITE8172 && I2C
diff -Nru a/drivers/i2c/algos/Makefile b/drivers/i2c/algos/Makefile
--- a/drivers/i2c/algos/Makefile 2004-08-23 11:04:47 -07:00
+++ b/drivers/i2c/algos/Makefile 2004-08-23 11:04:47 -07:00
@@ -4,6 +4,7 @@

obj-$(CONFIG_I2C_ALGOBIT) += i2c-algo-bit.o
obj-$(CONFIG_I2C_ALGOPCF) += i2c-algo-pcf.o
+obj-$(CONFIG_I2C_ALGOPCA) += i2c-algo-pca.o
obj-$(CONFIG_I2C_ALGOITE) += i2c-algo-ite.o

ifeq ($(CONFIG_I2C_DEBUG_ALGO),y)
diff -Nru a/drivers/i2c/algos/i2c-algo-pca.c b/drivers/i2c/algos/i2c-algo-pca.c
--- /dev/null Wed Dec 31 16:00:00 196900
+++ b/drivers/i2c/algos/i2c-algo-pca.c 2004-08-23 11:04:47 -07:00
@@ -0,0 +1,395 @@
+/*
+ * i2c-algo-pca.c i2c driver algorithms for PCA9564 adapters
+ * Copyright (C) 2004 Arcom Control Systems
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-pca.h>
+#include "i2c-algo-pca.h"
+
+#define DRIVER "i2c-algo-pca"
+
+#define DEB1(fmt, args...) do { if (i2c_debug>=1) printk(fmt, ## args); } while(0)
+#define DEB2(fmt, args...) do { if (i2c_debug>=2) printk(fmt, ## args); } while(0)
+#define DEB3(fmt, args...) do { if (i2c_debug>=3) printk(fmt, ## args); } while(0)
+
+static int i2c_debug=0;
+
+#define pca_outw(adap, reg, val) adap->write_byte(adap, reg, val)
+#define pca_inw(adap, reg) adap->read_byte(adap, reg)
+
+#define pca_status(adap) pca_inw(adap, I2C_PCA_STA)
+#define pca_clock(adap) adap->get_clock(adap)
+#define pca_own(adap) adap->get_own(adap)
+#define pca_set_con(adap, val) pca_outw(adap, I2C_PCA_CON, val)
+#define pca_get_con(adap) pca_inw(adap, I2C_PCA_CON)
+#define pca_wait(adap) adap->wait_for_interrupt(adap)
+
+/*
+ * Generate a start condition on the i2c bus.
+ *
+ * returns after the start condition has occured
+ */
+static void pca_start(struct i2c_algo_pca_data *adap)
+{
+ int sta = pca_get_con(adap);
+ DEB2("=== START\n");
+ sta |= I2C_PCA_CON_STA;
+ sta &= ~(I2C_PCA_CON_STO|I2C_PCA_CON_SI);
+ pca_set_con(adap, sta);
+ pca_wait(adap);
+}
+
+/*
+ * Generate a repeated start condition on the i2c bus
+ *
+ * return after the repeated start condition has occured
+ */
+static void pca_repeated_start(struct i2c_algo_pca_data *adap)
+{
+ int sta = pca_get_con(adap);
+ DEB2("=== REPEATED START\n");
+ sta |= I2C_PCA_CON_STA;
+ sta &= ~(I2C_PCA_CON_STO|I2C_PCA_CON_SI);
+ pca_set_con(adap, sta);
+ pca_wait(adap);
+}
+
+/*
+ * Generate a stop condition on the i2c bus
+ *
+ * returns after the stop condition has been generated
+ *
+ * STOPs do not generate an interrupt or set the SI flag, since the
+ * part returns the the idle state (0xf8). Hence we don't need to
+ * pca_wait here.
+ */
+static void pca_stop(struct i2c_algo_pca_data *adap)
+{
+ int sta = pca_get_con(adap);
+ DEB2("=== STOP\n");
+ sta |= I2C_PCA_CON_STO;
+ sta &= ~(I2C_PCA_CON_STA|I2C_PCA_CON_SI);
+ pca_set_con(adap, sta);
+}
+
+/*
+ * Send the slave address and R/W bit
+ *
+ * returns after the address has been sent
+ */
+static void pca_address(struct i2c_algo_pca_data *adap,
+ struct i2c_msg *msg)
+{
+ int sta = pca_get_con(adap);
+ int addr;
+
+ addr = ( (0x7f & msg->addr) << 1 );
+ if (msg->flags & I2C_M_RD )
+ addr |= 1;
+ DEB2("=== SLAVE ADDRESS %#04x+%c=%#04x\n",
+ msg->addr, msg->flags & I2C_M_RD ? 'R' : 'W', addr);
+
+ pca_outw(adap, I2C_PCA_DAT, addr);
+
+ sta &= ~(I2C_PCA_CON_STO|I2C_PCA_CON_STA|I2C_PCA_CON_SI);
+ pca_set_con(adap, sta);
+
+ pca_wait(adap);
+}
+
+/*
+ * Transmit a byte.
+ *
+ * Returns after the byte has been transmitted
+ */
+static void pca_tx_byte(struct i2c_algo_pca_data *adap,
+ __u8 b)
+{
+ int sta = pca_get_con(adap);
+ DEB2("=== WRITE %#04x\n", b);
+ pca_outw(adap, I2C_PCA_DAT, b);
+
+ sta &= ~(I2C_PCA_CON_STO|I2C_PCA_CON_STA|I2C_PCA_CON_SI);
+ pca_set_con(adap, sta);
+
+ pca_wait(adap);
+}
+
+/*
+ * Receive a byte
+ *
+ * returns immediately.
+ */
+static void pca_rx_byte(struct i2c_algo_pca_data *adap,
+ __u8 *b, int ack)
+{
+ *b = pca_inw(adap, I2C_PCA_DAT);
+ DEB2("=== READ %#04x %s\n", *b, ack ? "ACK" : "NACK");
+}
+
+/*
+ * Setup ACK or NACK for next received byte and wait for it to arrive.
+ *
+ * Returns after next byte has arrived.
+ */
+static void pca_rx_ack(struct i2c_algo_pca_data *adap,
+ int ack)
+{
+ int sta = pca_get_con(adap);
+
+ sta &= ~(I2C_PCA_CON_STO|I2C_PCA_CON_STA|I2C_PCA_CON_SI|I2C_PCA_CON_AA);
+
+ if ( ack )
+ sta |= I2C_PCA_CON_AA;
+
+ pca_set_con(adap, sta);
+ pca_wait(adap);
+}
+
+/*
+ * Reset the i2c bus / SIO
+ */
+static void pca_reset(struct i2c_algo_pca_data *adap)
+{
+ /* apparently only an external reset will do it. not a lot can be done */
+ printk(KERN_ERR DRIVER ": Haven't figured out how to do a reset yet\n");
+}
+
+static int pca_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg msgs[],
+ int num)
+{
+ struct i2c_algo_pca_data *adap = i2c_adap->algo_data;
+ struct i2c_msg *msg = NULL;
+ int curmsg;
+ int numbytes = 0;
+ int state;
+
+ state = pca_status(adap);
+ if ( state != 0xF8 ) {
+ printk(KERN_ERR DRIVER ": bus is not idle. status is %#04x\n", state );
+ /* FIXME: what to do. Force stop ? */
+ return -EREMOTEIO;
+ }
+
+ DEB1("{{{ XFER %d messages\n", num);
+
+ if (i2c_debug>=2) {
+ for (curmsg = 0; curmsg < num; curmsg++) {
+ int addr, i;
+ msg = &msgs[curmsg];
+
+ addr = (0x7f & msg->addr) ;
+
+ if (msg->flags & I2C_M_RD )
+ printk(KERN_INFO " [%02d] RD %d bytes from %#02x [%#02x, ...]\n",
+ curmsg, msg->len, addr, (addr<<1) | 1);
+ else {
+ printk(KERN_INFO " [%02d] WR %d bytes to %#02x [%#02x%s",
+ curmsg, msg->len, addr, addr<<1,
+ msg->len == 0 ? "" : ", ");
+ for(i=0; i < msg->len; i++)
+ printk("%#04x%s", msg->buf[i], i == msg->len - 1 ? "" : ", ");
+ printk("]\n");
+ }
+ }
+ }
+
+ curmsg = 0;
+ while (curmsg < num) {
+ state = pca_status(adap);
+
+ DEB3("STATE is 0x%02x\n", state);
+ msg = &msgs[curmsg];
+
+ switch (state) {
+ case 0xf8: /* On reset or stop the bus is idle */
+ pca_start(adap);
+ break;
+
+ case 0x08: /* A START condition has been transmitted */
+ case 0x10: /* A repeated start condition has been transmitted */
+ pca_address(adap, msg);
+ break;
+
+ case 0x18: /* SLA+W has been transmitted; ACK has been received */
+ case 0x28: /* Data byte in I2CDAT has been transmitted; ACK has been received */
+ if (numbytes < msg->len) {
+ pca_tx_byte(adap, msg->buf[numbytes]);
+ numbytes++;
+ break;
+ }
+ curmsg++; numbytes = 0;
+ if (curmsg == num)
+ pca_stop(adap);
+ else
+ pca_repeated_start(adap);
+ break;
+
+ case 0x20: /* SLA+W has been transmitted; NOT ACK has been received */
+ DEB2("NOT ACK recieved after SLA+W\n");
+ pca_stop(adap);
+ return -EREMOTEIO;
+
+ case 0x40: /* SLA+R has been transmitted; ACK has been received */
+ pca_rx_ack(adap, msg->len > 1);
+ break;
+
+ case 0x50: /* Data bytes has been received; ACK has been returned */
+ if (numbytes < msg->len) {
+ pca_rx_byte(adap, &msg->buf[numbytes], 1);
+ numbytes++;
+ pca_rx_ack(adap, numbytes < msg->len - 1);
+ break;
+ }
+ curmsg++; numbytes = 0;
+ if (curmsg == num)
+ pca_stop(adap);
+ else
+ pca_repeated_start(adap);
+ break;
+
+ case 0x48: /* SLA+R has been transmitted; NOT ACK has been received */
+ DEB2("NOT ACK received after SLA+R\n");
+ pca_stop(adap);
+ return -EREMOTEIO;
+
+ case 0x30: /* Data byte in I2CDAT has been transmitted; NOT ACK has been received */
+ DEB2("NOT ACK recieved after data byte\n");
+ return -EREMOTEIO;
+
+ case 0x38: /* Arbitration lost during SLA+W, SLA+R or data bytes */
+ DEB2("Arbitration lost\n");
+ return -EREMOTEIO;
+
+ case 0x58: /* Data byte has been received; NOT ACK has been returned */
+ if ( numbytes == msg->len - 1 ) {
+ pca_rx_byte(adap, &msg->buf[numbytes], 0);
+ curmsg++; numbytes = 0;
+ if (curmsg == num)
+ pca_stop(adap);
+ else
+ pca_repeated_start(adap);
+ } else {
+ DEB2("NOT ACK sent after data byte received. "
+ "Not final byte. numbytes %d. len %d\n",
+ numbytes, msg->len);
+ pca_stop(adap);
+ return -EREMOTEIO;
+ }
+ break;
+ case 0x70: /* Bus error - SDA stuck low */
+ DEB2("BUS ERROR - SDA Stuck low\n");
+ pca_reset(adap);
+ return -EREMOTEIO;
+ case 0x90: /* Bus error - SCL stuck low */
+ DEB2("BUS ERROR - SCL Stuck low\n");
+ pca_reset(adap);
+ return -EREMOTEIO;
+ case 0x00: /* Bus error during master or slave mode due to illegal START or STOP condition */
+ DEB2("BUS ERROR - Illegal START or STOP\n");
+ pca_reset(adap);
+ return -EREMOTEIO;
+ default:
+ printk(KERN_ERR DRIVER ": unhandled SIO state 0x%02x\n", state);
+ break;
+ }
+
+ }
+
+ DEB1(KERN_CRIT "}}} transfered %d messages. "
+ "status is %#04x. control is %#04x\n",
+ num, pca_status(adap),
+ pca_get_con(adap));
+ return curmsg;
+}
+
+static u32 pca_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_SMBUS_EMUL;
+}
+
+static int pca_init(struct i2c_algo_pca_data *adap)
+{
+ static int freqs[] = {330,288,217,146,88,59,44,36};
+ int own, clock;
+
+ own = pca_own(adap);
+ clock = pca_clock(adap);
+ DEB1(KERN_INFO DRIVER ": own address is %#04x\n", own);
+ DEB1(KERN_INFO DRIVER ": clock freqeuncy is %dkHz\n", freqs[clock]);
+
+ pca_outw(adap, I2C_PCA_ADR, own << 1);
+
+ pca_set_con(adap, I2C_PCA_CON_ENSIO | clock);
+ udelay(500); /* 500 µs for oscilator to stabilise */
+
+ return 0;
+}
+
+static struct i2c_algorithm pca_algo = {
+ .name = "PCA9564 algorithm",
+ .id = I2C_ALGO_PCA,
+ .master_xfer = pca_xfer,
+ .functionality = pca_func,
+};
+
+/*
+ * registering functions to load algorithms at runtime
+ */
+int i2c_pca_add_bus(struct i2c_adapter *adap)
+{
+ struct i2c_algo_pca_data *pca_adap = adap->algo_data;
+ int rval;
+
+ /* register new adapter to i2c module... */
+
+ adap->id |= pca_algo.id;
+ adap->algo = &pca_algo;
+
+ adap->timeout = 100; /* default values, should */
+ adap->retries = 3; /* be replaced by defines */
+
+ rval = pca_init(pca_adap);
+
+ if (!rval)
+ i2c_add_adapter(adap);
+
+ return rval;
+}
+
+int i2c_pca_del_bus(struct i2c_adapter *adap)
+{
+ return i2c_del_adapter(adap);
+}
+
+EXPORT_SYMBOL(i2c_pca_add_bus);
+EXPORT_SYMBOL(i2c_pca_del_bus);
+
+MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>");
+MODULE_DESCRIPTION("I2C-Bus PCA9564 algorithm");
+MODULE_LICENSE("GPL");
+
+module_param(i2c_debug, int, 0);
diff -Nru a/drivers/i2c/algos/i2c-algo-pca.h b/drivers/i2c/algos/i2c-algo-pca.h
--- /dev/null Wed Dec 31 16:00:00 196900
+++ b/drivers/i2c/algos/i2c-algo-pca.h 2004-08-23 11:04:47 -07:00
@@ -0,0 +1,26 @@
+#ifndef I2C_PCA9564_H
+#define I2C_PCA9564_H 1
+
+#define I2C_PCA_STA 0x00 /* STATUS Read Only */
+#define I2C_PCA_TO 0x00 /* TIMEOUT Write Only */
+#define I2C_PCA_DAT 0x01 /* DATA Read/Write */
+#define I2C_PCA_ADR 0x02 /* OWN ADR Read/Write */
+#define I2C_PCA_CON 0x03 /* CONTROL Read/Write */
+
+#define I2C_PCA_CON_AA 0x80 /* Assert Acknowledge */
+#define I2C_PCA_CON_ENSIO 0x40 /* Enable */
+#define I2C_PCA_CON_STA 0x20 /* Start */
+#define I2C_PCA_CON_STO 0x10 /* Stop */
+#define I2C_PCA_CON_SI 0x08 /* Serial Interrupt */
+#define I2C_PCA_CON_CR 0x07 /* Clock Rate (MASK) */
+
+#define I2C_PCA_CON_330kHz 0x00
+#define I2C_PCA_CON_288kHz 0x01
+#define I2C_PCA_CON_217kHz 0x02
+#define I2C_PCA_CON_146kHz 0x03
+#define I2C_PCA_CON_88kHz 0x04
+#define I2C_PCA_CON_59kHz 0x05
+#define I2C_PCA_CON_44kHz 0x06
+#define I2C_PCA_CON_36kHz 0x07
+
+#endif /* I2C_PCA9564_H */
diff -Nru a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
--- a/drivers/i2c/busses/Kconfig 2004-08-23 11:04:47 -07:00
+++ b/drivers/i2c/busses/Kconfig 2004-08-23 11:04:47 -07:00
@@ -419,4 +419,15 @@
This driver can also be built as a module. If so, the module
will be called i2c-voodoo3.

+config I2C_PCA_ISA
+ tristate "PCA9564 on an ISA bus"
+ depends on I2C
+ select I2C_ALGOPCA
+ help
+ This driver supports ISA boards using the Philips PCA 9564
+ Parallel bus to I2C bus controller
+
+ This driver can also be built as a module. If so, the module
+ will be called i2c-pca-isa.
+
endmenu
diff -Nru a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
--- a/drivers/i2c/busses/Makefile 2004-08-23 11:04:47 -07:00
+++ b/drivers/i2c/busses/Makefile 2004-08-23 11:04:47 -07:00
@@ -22,6 +22,7 @@
obj-$(CONFIG_I2C_NFORCE2) += i2c-nforce2.o
obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o
obj-$(CONFIG_I2C_PARPORT_LIGHT) += i2c-parport-light.o
+obj-$(CONFIG_I2C_PCA_ISA) += i2c-pca-isa.o
obj-$(CONFIG_I2C_PIIX4) += i2c-piix4.o
obj-$(CONFIG_I2C_PROSAVAGE) += i2c-prosavage.o
obj-$(CONFIG_I2C_RPXLITE) += i2c-rpx.o
diff -Nru a/drivers/i2c/busses/i2c-pca-isa.c b/drivers/i2c/busses/i2c-pca-isa.c
--- /dev/null Wed Dec 31 16:00:00 196900
+++ b/drivers/i2c/busses/i2c-pca-isa.c 2004-08-23 11:04:47 -07:00
@@ -0,0 +1,184 @@
+/*
+ * i2c-pca-isa.c driver for PCA9564 on ISA boards
+ * Copyright (C) 2004 Arcom Control Systems
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/wait.h>
+
+#include <linux/i2c.h>
+#include <linux/i2c-algo-pca.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#include "../algos/i2c-algo-pca.h"
+
+#define IO_SIZE 4
+
+#undef DEBUG_IO
+//#define DEBUG_IO
+
+static unsigned long base = 0x330;
+static int irq = 10;
+
+/* Data sheet recommends 59kHz for 100kHz operation due to variation
+ * in the actual clock rate */
+static int clock = I2C_PCA_CON_59kHz;
+
+static int own = 0x55;
+
+static wait_queue_head_t pca_wait;
+
+static int pca_isa_getown(struct i2c_algo_pca_data *adap)
+{
+ return (own);
+}
+
+static int pca_isa_getclock(struct i2c_algo_pca_data *adap)
+{
+ return (clock);
+}
+
+static void
+pca_isa_writebyte(struct i2c_algo_pca_data *adap, int reg, int val)
+{
+#ifdef DEBUG_IO
+ static char *names[] = { "T/O", "DAT", "ADR", "CON" };
+ printk("*** write %s at %#lx <= %#04x\n", names[reg], base+reg, val);
+#endif
+ outb(val, base+reg);
+}
+
+static int
+pca_isa_readbyte(struct i2c_algo_pca_data *adap, int reg)
+{
+ int res = inb(base+reg);
+#ifdef DEBUG_IO
+ {
+ static char *names[] = { "STA", "DAT", "ADR", "CON" };
+ printk("*** read %s => %#04x\n", names[reg], res);
+ }
+#endif
+ return res;
+}
+
+static int pca_isa_waitforinterrupt(struct i2c_algo_pca_data *adap)
+{
+ int ret = 0;
+
+ if (irq > -1) {
+ ret = wait_event_interruptible(pca_wait,
+ pca_isa_readbyte(adap, I2C_PCA_CON) & I2C_PCA_CON_SI);
+ } else {
+ while ((pca_isa_readbyte(adap, I2C_PCA_CON) & I2C_PCA_CON_SI) == 0)
+ udelay(100);
+ }
+ return ret;
+}
+
+static irqreturn_t pca_handler(int this_irq, void *dev_id, struct pt_regs *regs) {
+ wake_up_interruptible(&pca_wait);
+ return IRQ_HANDLED;
+}
+
+static struct i2c_algo_pca_data pca_isa_data = {
+ .get_own = pca_isa_getown,
+ .get_clock = pca_isa_getclock,
+ .write_byte = pca_isa_writebyte,
+ .read_byte = pca_isa_readbyte,
+ .wait_for_interrupt = pca_isa_waitforinterrupt,
+};
+
+static struct i2c_adapter pca_isa_ops = {
+ .owner = THIS_MODULE,
+ .id = I2C_HW_A_ISA,
+ .algo_data = &pca_isa_data,
+ .name = "PCA9564 ISA Adapter",
+};
+
+static int __init pca_isa_init(void)
+{
+
+ init_waitqueue_head(&pca_wait);
+
+ printk(KERN_INFO "i2c-pca-isa: i/o base %#08lx. irq %d\n", base, irq);
+
+ if (!request_region(base, IO_SIZE, "i2c-pca-isa")) {
+ printk(KERN_ERR "i2c-pca-isa: I/O address %#08lx is in use.\n", base);
+ goto out;
+ }
+
+ if (irq > -1) {
+ if (request_irq(irq, pca_handler, 0, "i2c-pca-isa", &pca_isa_ops) < 0) {
+ printk(KERN_ERR "i2c-pca-isa: Request irq%d failed\n", irq);
+ goto out_region;
+ }
+ }
+
+ if (i2c_pca_add_bus(&pca_isa_ops) < 0) {
+ printk(KERN_ERR "i2c-pca-isa: Failed to add i2c bus\n");
+ goto out_irq;
+ }
+
+ return 0;
+
+ out_irq:
+ if (irq > -1)
+ free_irq(irq, &pca_isa_ops);
+ out_region:
+ release_region(base, IO_SIZE);
+ out:
+ return -ENODEV;
+}
+
+static void pca_isa_exit(void)
+{
+ i2c_pca_del_bus(&pca_isa_ops);
+
+ if (irq > 0) {
+ disable_irq(irq);
+ free_irq(irq, &pca_isa_ops);
+ }
+ release_region(base, IO_SIZE);
+}
+
+MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>");
+MODULE_DESCRIPTION("ISA base PCA9564 driver");
+MODULE_LICENSE("GPL");
+
+module_param(base, ulong, 0);
+MODULE_PARM_DESC(base, "I/O base address");
+
+module_param(irq, int, 0);
+MODULE_PARM_DESC(irq, "IRQ");
+module_param(clock, int, 0);
+MODULE_PARM_DESC(clock, "Clock rate as described in table 1 of PCA9564 datasheet");
+
+module_param(own, int, 0); /* the driver can't do slave mode, so there's no real point in this */
+
+module_init(pca_isa_init);
+module_exit(pca_isa_exit);
diff -Nru a/include/linux/i2c-algo-pca.h b/include/linux/i2c-algo-pca.h
--- /dev/null Wed Dec 31 16:00:00 196900
+++ b/include/linux/i2c-algo-pca.h 2004-08-23 11:04:47 -07:00
@@ -0,0 +1,17 @@
+#ifndef _LINUX_I2C_ALGO_PCA_H
+#define _LINUX_I2C_ALGO_PCA_H
+
+struct i2c_algo_pca_data {
+ int (*get_own) (struct i2c_algo_pca_data *adap); /* Obtain own address */
+ int (*get_clock) (struct i2c_algo_pca_data *adap);
+ void (*write_byte) (struct i2c_algo_pca_data *adap, int reg, int val);
+ int (*read_byte) (struct i2c_algo_pca_data *adap, int reg);
+ int (*wait_for_interrupt) (struct i2c_algo_pca_data *adap);
+};
+
+#define I2C_PCA_ADAP_MAX 16
+
+int i2c_pca_add_bus(struct i2c_adapter *);
+int i2c_pca_del_bus(struct i2c_adapter *);
+
+#endif /* _LINUX_I2C_ALGO_PCA_H */
diff -Nru a/include/linux/i2c-id.h b/include/linux/i2c-id.h
--- a/include/linux/i2c-id.h 2004-08-23 11:04:47 -07:00
+++ b/include/linux/i2c-id.h 2004-08-23 11:04:47 -07:00
@@ -194,6 +194,7 @@
#define I2C_ALGO_OCP 0x120000 /* IBM or otherwise On-chip I2C algorithm */
#define I2C_ALGO_BITHS 0x130000 /* enhanced bit style adapters */
#define I2C_ALGO_OCP_IOP3XX 0x140000 /* XSCALE IOP3XX On-chip I2C alg */
+#define I2C_ALGO_PCA 0x150000 /* PCA 9564 style adapters */

#define I2C_ALGO_EXP 0x800000 /* experimental */

@@ -238,6 +239,9 @@
#define I2C_HW_P_LP 0x00 /* Parallel port interface */
#define I2C_HW_P_ISA 0x01 /* generic ISA Bus inteface card */
#define I2C_HW_P_ELEK 0x02 /* Elektor ISA Bus inteface card */
+
+/* --- PCA 9564 based algorithms */
+#define I2C_HW_A_ISA 0x00 /* generic ISA Bus interface card */

/* --- ACPI Embedded controller algorithms */
#define I2C_HW_ACPI_EC 0x00