Re: [PATCH] i2c driver fixes for 2.6.0-test5
From: Greg KH
Date: Mon Sep 22 2003 - 18:40:09 EST
ChangeSet 1.1315.1.23, 2003/09/22 14:21:09-07:00, greg@xxxxxxxxx
[PATCH] I2C: move the scx200* drivers to drivers/i2c/busses
drivers/i2c/scx200_acb.c | 553 ----------------------------------------
drivers/i2c/scx200_i2c.c | 133 ---------
drivers/i2c/Kconfig | 38 --
drivers/i2c/Makefile | 2
drivers/i2c/busses/Kconfig | 38 ++
drivers/i2c/busses/Makefile | 2
drivers/i2c/busses/scx200_acb.c | 553 ++++++++++++++++++++++++++++++++++++++++
drivers/i2c/busses/scx200_i2c.c | 132 +++++++++
8 files changed, 725 insertions(+), 726 deletions(-)
diff -Nru a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
--- a/drivers/i2c/Kconfig Mon Sep 22 16:12:15 2003
+++ b/drivers/i2c/Kconfig Mon Sep 22 16:12:15 2003
@@ -48,44 +48,6 @@
This support is also available as a module. If so, the module
will be called i2c-algo-bit.
-config SCx200_I2C
- tristate "NatSemi SCx200 I2C using GPIO pins"
- depends on SCx200 && I2C_ALGOBIT
- help
- Enable the use of two GPIO pins of a SCx200 processor as an I2C bus.
-
- If you don't know what to do here, say N.
-
- This support is also available as a module. If so, the module
- will be called scx200_i2c.
-
-config SCx200_I2C_SCL
- int "GPIO pin used for SCL"
- depends on SCx200_I2C
- default "12"
- help
- Enter the GPIO pin number used for the SCL signal. This value can
- also be specified with a module parameter.
-
-config SCx200_I2C_SDA
- int "GPIO pin used for SDA"
- depends on SCx200_I2C
- default "13"
- help
- Enter the GPIO pin number used for the SSA signal. This value can
- also be specified with a module parameter.
-
-config SCx200_ACB
- tristate "NatSemi SCx200 ACCESS.bus"
- depends on I2C_ALGOBIT!=n && I2C
- help
- Enable the use of the ACCESS.bus controllers of a SCx200 processor.
-
- If you don't know what to do here, say N.
-
- This support is also available as a module. If so, the module
- will be called scx200_acb.
-
config I2C_ALGOPCF
tristate "I2C PCF 8584 interfaces"
depends on I2C
diff -Nru a/drivers/i2c/Makefile b/drivers/i2c/Makefile
--- a/drivers/i2c/Makefile Mon Sep 22 16:12:15 2003
+++ b/drivers/i2c/Makefile Mon Sep 22 16:12:15 2003
@@ -9,8 +9,6 @@
obj-$(CONFIG_I2C_KEYWEST) += i2c-keywest.o
obj-$(CONFIG_ITE_I2C_ALGO) += i2c-algo-ite.o
obj-$(CONFIG_ITE_I2C_ADAP) += i2c-adap-ite.o
-obj-$(CONFIG_SCx200_I2C) += scx200_i2c.o
-obj-$(CONFIG_SCx200_ACB) += scx200_acb.o
obj-$(CONFIG_I2C_IBM_IIC) += i2c-ibm_iic.o
obj-$(CONFIG_I2C_SENSOR) += i2c-sensor.o
obj-$(CONFIG_I2C_IOP3XX) += i2c-iop3xx.o
diff -Nru a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
--- a/drivers/i2c/busses/Kconfig Mon Sep 22 16:12:15 2003
+++ b/drivers/i2c/busses/Kconfig Mon Sep 22 16:12:15 2003
@@ -166,6 +166,44 @@
This driver can also be built as a module. If so, the module
will be called i2c-savage4.
+config SCx200_I2C
+ tristate "NatSemi SCx200 I2C using GPIO pins"
+ depends on SCx200 && I2C_ALGOBIT
+ help
+ Enable the use of two GPIO pins of a SCx200 processor as an I2C bus.
+
+ If you don't know what to do here, say N.
+
+ This support is also available as a module. If so, the module
+ will be called scx200_i2c.
+
+config SCx200_I2C_SCL
+ int "GPIO pin used for SCL"
+ depends on SCx200_I2C
+ default "12"
+ help
+ Enter the GPIO pin number used for the SCL signal. This value can
+ also be specified with a module parameter.
+
+config SCx200_I2C_SDA
+ int "GPIO pin used for SDA"
+ depends on SCx200_I2C
+ default "13"
+ help
+ Enter the GPIO pin number used for the SSA signal. This value can
+ also be specified with a module parameter.
+
+config SCx200_ACB
+ tristate "NatSemi SCx200 ACCESS.bus"
+ depends on I2C_ALGOBIT!=n && I2C
+ help
+ Enable the use of the ACCESS.bus controllers of a SCx200 processor.
+
+ If you don't know what to do here, say N.
+
+ This support is also available as a module. If so, the module
+ will be called scx200_acb.
+
config I2C_SIS5595
tristate "SiS 5595"
depends on I2C && PCI && EXPERIMENTAL
diff -Nru a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
--- a/drivers/i2c/busses/Makefile Mon Sep 22 16:12:15 2003
+++ b/drivers/i2c/busses/Makefile Mon Sep 22 16:12:15 2003
@@ -23,3 +23,5 @@
obj-$(CONFIG_I2C_VIA) += i2c-via.o
obj-$(CONFIG_I2C_VIAPRO) += i2c-viapro.o
obj-$(CONFIG_I2C_VOODOO3) += i2c-voodoo3.o
+obj-$(CONFIG_SCx200_I2C) += scx200_i2c.o
+obj-$(CONFIG_SCx200_ACB) += scx200_acb.o
diff -Nru a/drivers/i2c/busses/scx200_acb.c b/drivers/i2c/busses/scx200_acb.c
--- /dev/null Wed Dec 31 16:00:00 1969
+++ b/drivers/i2c/busses/scx200_acb.c Mon Sep 22 16:12:15 2003
@@ -0,0 +1,553 @@
+/* linux/drivers/i2c/scx200_acb.c
+
+ Copyright (c) 2001,2002 Christer Weinigel <wingel@xxxxxxxxxxxxxxx>
+
+ National Semiconductor SCx200 ACCESS.bus support
+
+ Based on i2c-keywest.c which is:
+ Copyright (c) 2001 Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
+ Copyright (c) 2000 Philip Edelbrock <phil@xxxxxxxxxxxxxxxxxxxx>
+
+ 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/module.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/smp_lock.h>
+#include <linux/pci.h>
+#include <asm/io.h>
+
+#include <linux/scx200.h>
+
+#define NAME "scx200_acb"
+
+MODULE_AUTHOR("Christer Weinigel <wingel@xxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("NatSemi SCx200 ACCESS.bus Driver");
+MODULE_LICENSE("GPL");
+
+#define MAX_DEVICES 4
+static int base[MAX_DEVICES] = { 0x840 };
+MODULE_PARM(base, "1-4i");
+MODULE_PARM_DESC(base, "Base addresses for the ACCESS.bus controllers");
+
+#define DEBUG 0
+
+#if DEBUG
+#define DBG(x...) printk(KERN_DEBUG NAME ": " x)
+#else
+#define DBG(x...)
+#endif
+
+/* The hardware supports interrupt driven mode too, but I haven't
+ implemented that. */
+#define POLLED_MODE 1
+#define POLL_TIMEOUT (HZ)
+
+enum scx200_acb_state {
+ state_idle,
+ state_address,
+ state_command,
+ state_repeat_start,
+ state_quick,
+ state_read,
+ state_write,
+};
+
+static const char *scx200_acb_state_name[] = {
+ "idle",
+ "address",
+ "command",
+ "repeat_start",
+ "quick",
+ "read",
+ "write",
+};
+
+/* Physical interface */
+struct scx200_acb_iface
+{
+ struct scx200_acb_iface *next;
+ struct i2c_adapter adapter;
+ unsigned base;
+ struct semaphore sem;
+
+ /* State machine data */
+ enum scx200_acb_state state;
+ int result;
+ u8 address_byte;
+ u8 command;
+ u8 *ptr;
+ char needs_reset;
+ unsigned len;
+};
+
+/* Register Definitions */
+#define ACBSDA (iface->base + 0)
+#define ACBST (iface->base + 1)
+#define ACBST_SDAST 0x40 /* SDA Status */
+#define ACBST_BER 0x20
+#define ACBST_NEGACK 0x10 /* Negative Acknowledge */
+#define ACBST_STASTR 0x08 /* Stall After Start */
+#define ACBST_MASTER 0x02
+#define ACBCST (iface->base + 2)
+#define ACBCST_BB 0x02
+#define ACBCTL1 (iface->base + 3)
+#define ACBCTL1_STASTRE 0x80
+#define ACBCTL1_NMINTE 0x40
+#define ACBCTL1_ACK 0x10
+#define ACBCTL1_STOP 0x02
+#define ACBCTL1_START 0x01
+#define ACBADDR (iface->base + 4)
+#define ACBCTL2 (iface->base + 5)
+#define ACBCTL2_ENABLE 0x01
+
+/************************************************************************/
+
+static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status)
+{
+ const char *errmsg;
+
+ DBG("state %s, status = 0x%02x\n",
+ scx200_acb_state_name[iface->state], status);
+
+ if (status & ACBST_BER) {
+ errmsg = "bus error";
+ goto error;
+ }
+ if (!(status & ACBST_MASTER)) {
+ errmsg = "not master";
+ goto error;
+ }
+ if (status & ACBST_NEGACK)
+ goto negack;
+
+ switch (iface->state) {
+ case state_idle:
+ dev_warn(&iface->adapter.dev, "interrupt in idle state\n");
+ break;
+
+ case state_address:
+ /* Do a pointer write first */
+ outb(iface->address_byte & ~1, ACBSDA);
+
+ iface->state = state_command;
+ break;
+
+ case state_command:
+ outb(iface->command, ACBSDA);
+
+ if (iface->address_byte & 1)
+ iface->state = state_repeat_start;
+ else
+ iface->state = state_write;
+ break;
+
+ case state_repeat_start:
+ outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1);
+ /* fallthrough */
+
+ case state_quick:
+ if (iface->address_byte & 1) {
+ if (iface->len == 1)
+ outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1);
+ else
+ outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1);
+ outb(iface->address_byte, ACBSDA);
+
+ iface->state = state_read;
+ } else {
+ outb(iface->address_byte, ACBSDA);
+
+ iface->state = state_write;
+ }
+ break;
+
+ case state_read:
+ /* Set ACK if receiving the last byte */
+ if (iface->len == 1)
+ outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1);
+ else
+ outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1);
+
+ *iface->ptr++ = inb(ACBSDA);
+ --iface->len;
+
+ if (iface->len == 0) {
+ iface->result = 0;
+ iface->state = state_idle;
+ outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
+ }
+
+ break;
+
+ case state_write:
+ if (iface->len == 0) {
+ iface->result = 0;
+ iface->state = state_idle;
+ outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
+ break;
+ }
+
+ outb(*iface->ptr++, ACBSDA);
+ --iface->len;
+
+ break;
+ }
+
+ return;
+
+ negack:
+ DBG("negative acknowledge in state %s\n",
+ scx200_acb_state_name[iface->state]);
+
+ iface->state = state_idle;
+ iface->result = -ENXIO;
+
+ outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
+ outb(ACBST_STASTR | ACBST_NEGACK, ACBST);
+ return;
+
+ error:
+ dev_err(&iface->adapter.dev, "%s in state %s\n", errmsg,
+ scx200_acb_state_name[iface->state]);
+
+ iface->state = state_idle;
+ iface->result = -EIO;
+ iface->needs_reset = 1;
+}
+
+static void scx200_acb_timeout(struct scx200_acb_iface *iface)
+{
+ dev_err(&iface->adapter.dev, "timeout in state %s\n",
+ scx200_acb_state_name[iface->state]);
+
+ iface->state = state_idle;
+ iface->result = -EIO;
+ iface->needs_reset = 1;
+}
+
+#ifdef POLLED_MODE
+static void scx200_acb_poll(struct scx200_acb_iface *iface)
+{
+ u8 status = 0;
+ unsigned long timeout;
+
+ timeout = jiffies + POLL_TIMEOUT;
+ while (time_before(jiffies, timeout)) {
+ status = inb(ACBST);
+ if ((status & (ACBST_SDAST|ACBST_BER|ACBST_NEGACK)) != 0) {
+ scx200_acb_machine(iface, status);
+ return;
+ }
+ schedule_timeout(HZ/100+1);
+ }
+
+ scx200_acb_timeout(iface);
+}
+#endif /* POLLED_MODE */
+
+static void scx200_acb_reset(struct scx200_acb_iface *iface)
+{
+ /* Disable the ACCESS.bus device and Configure the SCL
+ frequency: 16 clock cycles */
+ outb(0x70, ACBCTL2);
+ /* Polling mode */
+ outb(0, ACBCTL1);
+ /* Disable slave address */
+ outb(0, ACBADDR);
+ /* Enable the ACCESS.bus device */
+ outb(inb(ACBCTL2) | ACBCTL2_ENABLE, ACBCTL2);
+ /* Free STALL after START */
+ outb(inb(ACBCTL1) & ~(ACBCTL1_STASTRE | ACBCTL1_NMINTE), ACBCTL1);
+ /* Send a STOP */
+ outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
+ /* Clear BER, NEGACK and STASTR bits */
+ outb(ACBST_BER | ACBST_NEGACK | ACBST_STASTR, ACBST);
+ /* Clear BB bit */
+ outb(inb(ACBCST) | ACBCST_BB, ACBCST);
+}
+
+static s32 scx200_acb_smbus_xfer(struct i2c_adapter *adapter,
+ u16 address, unsigned short flags,
+ char rw, u8 command, int size,
+ union i2c_smbus_data *data)
+{
+ struct scx200_acb_iface *iface = i2c_get_adapdata(adapter);
+ int len;
+ u8 *buffer;
+ u16 cur_word;
+ int rc;
+
+ switch (size) {
+ case I2C_SMBUS_QUICK:
+ len = 0;
+ buffer = NULL;
+ break;
+ case I2C_SMBUS_BYTE:
+ if (rw == I2C_SMBUS_READ) {
+ len = 1;
+ buffer = &data->byte;
+ } else {
+ len = 1;
+ buffer = &command;
+ }
+ break;
+ case I2C_SMBUS_BYTE_DATA:
+ len = 1;
+ buffer = &data->byte;
+ break;
+ case I2C_SMBUS_WORD_DATA:
+ len = 2;
+ cur_word = cpu_to_le16(data->word);
+ buffer = (u8 *)&cur_word;
+ break;
+ case I2C_SMBUS_BLOCK_DATA:
+ len = data->block[0];
+ buffer = &data->block[1];
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ DBG("size=%d, address=0x%x, command=0x%x, len=%d, read=%d\n",
+ size, address, command, len, rw == I2C_SMBUS_READ);
+
+ if (!len && rw == I2C_SMBUS_READ) {
+ dev_warn(&adapter->dev, "zero length read\n");
+ return -EINVAL;
+ }
+
+ if (len && !buffer) {
+ dev_warn(&adapter->dev, "nonzero length but no buffer\n");
+ return -EFAULT;
+ }
+
+ down(&iface->sem);
+
+ iface->address_byte = address<<1;
+ if (rw == I2C_SMBUS_READ)
+ iface->address_byte |= 1;
+ iface->command = command;
+ iface->ptr = buffer;
+ iface->len = len;
+ iface->result = -EINVAL;
+ iface->needs_reset = 0;
+
+ outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1);
+
+ if (size == I2C_SMBUS_QUICK || size == I2C_SMBUS_BYTE)
+ iface->state = state_quick;
+ else
+ iface->state = state_address;
+
+#ifdef POLLED_MODE
+ while (iface->state != state_idle)
+ scx200_acb_poll(iface);
+#else /* POLLED_MODE */
+#error Interrupt driven mode not implemented
+#endif /* POLLED_MODE */
+
+ if (iface->needs_reset)
+ scx200_acb_reset(iface);
+
+ rc = iface->result;
+
+ up(&iface->sem);
+
+ if (rc == 0 && size == I2C_SMBUS_WORD_DATA && rw == I2C_SMBUS_READ)
+ data->word = le16_to_cpu(cur_word);
+
+#if DEBUG
+ printk(KERN_DEBUG NAME ": transfer done, result: %d", rc);
+ if (buffer) {
+ int i;
+ printk(" data:");
+ for (i = 0; i < len; ++i)
+ printk(" %02x", buffer[i]);
+ }
+ printk("\n");
+#endif
+
+ return rc;
+}
+
+static u32 scx200_acb_func(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
+ I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
+ I2C_FUNC_SMBUS_BLOCK_DATA;
+}
+
+/* For now, we only handle combined mode (smbus) */
+static struct i2c_algorithm scx200_acb_algorithm = {
+ .name = "NatSemi SCx200 ACCESS.bus",
+ .id = I2C_ALGO_SMBUS,
+ .smbus_xfer = scx200_acb_smbus_xfer,
+ .functionality = scx200_acb_func,
+};
+
+struct scx200_acb_iface *scx200_acb_list;
+
+int scx200_acb_probe(struct scx200_acb_iface *iface)
+{
+ u8 val;
+
+ /* Disable the ACCESS.bus device and Configure the SCL
+ frequency: 16 clock cycles */
+ outb(0x70, ACBCTL2);
+
+ if (inb(ACBCTL2) != 0x70) {
+ DBG("ACBCTL2 readback failed\n");
+ return -ENXIO;
+ }
+
+ outb(inb(ACBCTL1) | ACBCTL1_NMINTE, ACBCTL1);
+
+ val = inb(ACBCTL1);
+ if (val) {
+ DBG("disabled, but ACBCTL1=0x%02x\n", val);
+ return -ENXIO;
+ }
+
+ outb(inb(ACBCTL2) | ACBCTL2_ENABLE, ACBCTL2);
+
+ outb(inb(ACBCTL1) | ACBCTL1_NMINTE, ACBCTL1);
+
+ val = inb(ACBCTL1);
+ if ((val & ACBCTL1_NMINTE) != ACBCTL1_NMINTE) {
+ DBG("enabled, but NMINTE won't be set, ACBCTL1=0x%02x\n", val);
+ return -ENXIO;
+ }
+
+ return 0;
+}
+
+static int __init scx200_acb_create(int base, int index)
+{
+ struct scx200_acb_iface *iface;
+ struct i2c_adapter *adapter;
+ int rc = 0;
+ char description[64];
+
+ iface = kmalloc(sizeof(*iface), GFP_KERNEL);
+ if (!iface) {
+ printk(KERN_ERR NAME ": can't allocate memory\n");
+ rc = -ENOMEM;
+ goto errout;
+ }
+
+ memset(iface, 0, sizeof(*iface));
+ adapter = &iface->adapter;
+ i2c_set_adapdata(adapter, iface);
+ snprintf(adapter->name, I2C_NAME_SIZE, "SCx200 ACB%d", index);
+ adapter->owner = THIS_MODULE;
+ adapter->id = I2C_ALGO_SMBUS;
+ adapter->algo = &scx200_acb_algorithm;
+
+ init_MUTEX(&iface->sem);
+
+ snprintf(description, sizeof(description), "NatSemi SCx200 ACCESS.bus [%s]", adapter->name);
+ if (request_region(base, 8, description) == 0) {
+ dev_err(&adapter->dev, "can't allocate io 0x%x-0x%x\n",
+ base, base + 8-1);
+ rc = -EBUSY;
+ goto errout;
+ }
+ iface->base = base;
+
+ rc = scx200_acb_probe(iface);
+ if (rc) {
+ dev_warn(&adapter->dev, "probe failed\n");
+ goto errout;
+ }
+
+ scx200_acb_reset(iface);
+
+ if (i2c_add_adapter(adapter) < 0) {
+ dev_err(&adapter->dev, "failed to register\n");
+ rc = -ENODEV;
+ goto errout;
+ }
+
+ lock_kernel();
+ iface->next = scx200_acb_list;
+ scx200_acb_list = iface;
+ unlock_kernel();
+
+ return 0;
+
+ errout:
+ if (iface) {
+ if (iface->base)
+ release_region(iface->base, 8);
+ kfree(iface);
+ }
+ return rc;
+}
+
+static int __init scx200_acb_init(void)
+{
+ int i;
+ int rc;
+
+ printk(KERN_DEBUG NAME ": NatSemi SCx200 ACCESS.bus Driver\n");
+
+ /* Verify that this really is a SCx200 processor */
+ if (pci_find_device(PCI_VENDOR_ID_NS,
+ PCI_DEVICE_ID_NS_SCx200_BRIDGE,
+ NULL) == NULL)
+ return -ENODEV;
+
+ rc = -ENXIO;
+ for (i = 0; i < MAX_DEVICES; ++i) {
+ if (base[i] > 0)
+ rc = scx200_acb_create(base[i], i);
+ }
+ if (scx200_acb_list)
+ return 0;
+ return rc;
+}
+
+static void __exit scx200_acb_cleanup(void)
+{
+ struct scx200_acb_iface *iface;
+ lock_kernel();
+ while ((iface = scx200_acb_list) != NULL) {
+ scx200_acb_list = iface->next;
+ unlock_kernel();
+
+ i2c_del_adapter(&iface->adapter);
+ release_region(iface->base, 8);
+ kfree(iface);
+ lock_kernel();
+ }
+ unlock_kernel();
+}
+
+module_init(scx200_acb_init);
+module_exit(scx200_acb_cleanup);
+
+/*
+ Local variables:
+ compile-command: "make -k -C ../.. SUBDIRS=drivers/i2c modules"
+ c-basic-offset: 8
+ End:
+*/
+
diff -Nru a/drivers/i2c/busses/scx200_i2c.c b/drivers/i2c/busses/scx200_i2c.c
--- /dev/null Wed Dec 31 16:00:00 1969
+++ b/drivers/i2c/busses/scx200_i2c.c Mon Sep 22 16:12:15 2003
@@ -0,0 +1,132 @@
+/* linux/drivers/i2c/scx200_i2c.c
+
+ Copyright (c) 2001,2002 Christer Weinigel <wingel@xxxxxxxxxxxxxxx>
+
+ National Semiconductor SCx200 I2C bus on GPIO pins
+
+ Based on i2c-velleman.c Copyright (C) 1995-96, 2000 Simon G. Vogl
+
+ 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/module.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+#include <asm/io.h>
+
+#include <linux/scx200_gpio.h>
+
+#define NAME "scx200_i2c"
+
+MODULE_AUTHOR("Christer Weinigel <wingel@xxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("NatSemi SCx200 I2C Driver");
+MODULE_LICENSE("GPL");
+
+MODULE_PARM(scl, "i");
+MODULE_PARM_DESC(scl, "GPIO line for SCL");
+MODULE_PARM(sda, "i");
+MODULE_PARM_DESC(sda, "GPIO line for SDA");
+
+static int scl = CONFIG_SCx200_I2C_SCL;
+static int sda = CONFIG_SCx200_I2C_SDA;
+
+static void scx200_i2c_setscl(void *data, int state)
+{
+ scx200_gpio_set(scl, state);
+}
+
+static void scx200_i2c_setsda(void *data, int state)
+{
+ scx200_gpio_set(sda, state);
+}
+
+static int scx200_i2c_getscl(void *data)
+{
+ return scx200_gpio_get(scl);
+}
+
+static int scx200_i2c_getsda(void *data)
+{
+ return scx200_gpio_get(sda);
+}
+
+/* ------------------------------------------------------------------------
+ * Encapsulate the above functions in the correct operations structure.
+ * This is only done when more than one hardware adapter is supported.
+ */
+
+static struct i2c_algo_bit_data scx200_i2c_data = {
+ NULL,
+ scx200_i2c_setsda,
+ scx200_i2c_setscl,
+ scx200_i2c_getsda,
+ scx200_i2c_getscl,
+ 10, 10, 100, /* waits, timeout */
+};
+
+static struct i2c_adapter scx200_i2c_ops = {
+ .owner = THIS_MODULE,
+ .algo_data = &scx200_i2c_data,
+ .name = "NatSemi SCx200 I2C",
+};
+
+int scx200_i2c_init(void)
+{
+ printk(KERN_DEBUG NAME ": NatSemi SCx200 I2C Driver\n");
+
+ if (!scx200_gpio_present()) {
+ printk(KERN_ERR NAME ": no SCx200 gpio pins available\n");
+ return -ENODEV;
+ }
+
+ printk(KERN_DEBUG NAME ": SCL=GPIO%02u, SDA=GPIO%02u\n",
+ scl, sda);
+
+ if (scl == -1 || sda == -1 || scl == sda) {
+ printk(KERN_ERR NAME ": scl and sda must be specified\n");
+ return -EINVAL;
+ }
+
+ /* Configure GPIOs as open collector outputs */
+ scx200_gpio_configure(scl, ~2, 5);
+ scx200_gpio_configure(sda, ~2, 5);
+
+ if (i2c_bit_add_bus(&scx200_i2c_ops) < 0) {
+ printk(KERN_ERR NAME ": adapter %s registration failed\n",
+ scx200_i2c_ops.name);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+void scx200_i2c_cleanup(void)
+{
+ i2c_bit_del_bus(&scx200_i2c_ops);
+}
+
+module_init(scx200_i2c_init);
+module_exit(scx200_i2c_cleanup);
+
+/*
+ Local variables:
+ compile-command: "make -k -C ../.. SUBDIRS=drivers/i2c modules"
+ c-basic-offset: 8
+ End:
+*/
diff -Nru a/drivers/i2c/scx200_acb.c b/drivers/i2c/scx200_acb.c
--- a/drivers/i2c/scx200_acb.c Mon Sep 22 16:12:15 2003
+++ /dev/null Wed Dec 31 16:00:00 1969
@@ -1,553 +0,0 @@
-/* linux/drivers/i2c/scx200_acb.c
-
- Copyright (c) 2001,2002 Christer Weinigel <wingel@xxxxxxxxxxxxxxx>
-
- National Semiconductor SCx200 ACCESS.bus support
-
- Based on i2c-keywest.c which is:
- Copyright (c) 2001 Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
- Copyright (c) 2000 Philip Edelbrock <phil@xxxxxxxxxxxxxxxxxxxx>
-
- 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/module.h>
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/i2c.h>
-#include <linux/smp_lock.h>
-#include <linux/pci.h>
-#include <asm/io.h>
-
-#include <linux/scx200.h>
-
-#define NAME "scx200_acb"
-
-MODULE_AUTHOR("Christer Weinigel <wingel@xxxxxxxxxxxxxxx>");
-MODULE_DESCRIPTION("NatSemi SCx200 ACCESS.bus Driver");
-MODULE_LICENSE("GPL");
-
-#define MAX_DEVICES 4
-static int base[MAX_DEVICES] = { 0x840 };
-MODULE_PARM(base, "1-4i");
-MODULE_PARM_DESC(base, "Base addresses for the ACCESS.bus controllers");
-
-#define DEBUG 0
-
-#if DEBUG
-#define DBG(x...) printk(KERN_DEBUG NAME ": " x)
-#else
-#define DBG(x...)
-#endif
-
-/* The hardware supports interrupt driven mode too, but I haven't
- implemented that. */
-#define POLLED_MODE 1
-#define POLL_TIMEOUT (HZ)
-
-enum scx200_acb_state {
- state_idle,
- state_address,
- state_command,
- state_repeat_start,
- state_quick,
- state_read,
- state_write,
-};
-
-static const char *scx200_acb_state_name[] = {
- "idle",
- "address",
- "command",
- "repeat_start",
- "quick",
- "read",
- "write",
-};
-
-/* Physical interface */
-struct scx200_acb_iface
-{
- struct scx200_acb_iface *next;
- struct i2c_adapter adapter;
- unsigned base;
- struct semaphore sem;
-
- /* State machine data */
- enum scx200_acb_state state;
- int result;
- u8 address_byte;
- u8 command;
- u8 *ptr;
- char needs_reset;
- unsigned len;
-};
-
-/* Register Definitions */
-#define ACBSDA (iface->base + 0)
-#define ACBST (iface->base + 1)
-#define ACBST_SDAST 0x40 /* SDA Status */
-#define ACBST_BER 0x20
-#define ACBST_NEGACK 0x10 /* Negative Acknowledge */
-#define ACBST_STASTR 0x08 /* Stall After Start */
-#define ACBST_MASTER 0x02
-#define ACBCST (iface->base + 2)
-#define ACBCST_BB 0x02
-#define ACBCTL1 (iface->base + 3)
-#define ACBCTL1_STASTRE 0x80
-#define ACBCTL1_NMINTE 0x40
-#define ACBCTL1_ACK 0x10
-#define ACBCTL1_STOP 0x02
-#define ACBCTL1_START 0x01
-#define ACBADDR (iface->base + 4)
-#define ACBCTL2 (iface->base + 5)
-#define ACBCTL2_ENABLE 0x01
-
-/************************************************************************/
-
-static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status)
-{
- const char *errmsg;
-
- DBG("state %s, status = 0x%02x\n",
- scx200_acb_state_name[iface->state], status);
-
- if (status & ACBST_BER) {
- errmsg = "bus error";
- goto error;
- }
- if (!(status & ACBST_MASTER)) {
- errmsg = "not master";
- goto error;
- }
- if (status & ACBST_NEGACK)
- goto negack;
-
- switch (iface->state) {
- case state_idle:
- dev_warn(&iface->adapter.dev, "interrupt in idle state\n");
- break;
-
- case state_address:
- /* Do a pointer write first */
- outb(iface->address_byte & ~1, ACBSDA);
-
- iface->state = state_command;
- break;
-
- case state_command:
- outb(iface->command, ACBSDA);
-
- if (iface->address_byte & 1)
- iface->state = state_repeat_start;
- else
- iface->state = state_write;
- break;
-
- case state_repeat_start:
- outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1);
- /* fallthrough */
-
- case state_quick:
- if (iface->address_byte & 1) {
- if (iface->len == 1)
- outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1);
- else
- outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1);
- outb(iface->address_byte, ACBSDA);
-
- iface->state = state_read;
- } else {
- outb(iface->address_byte, ACBSDA);
-
- iface->state = state_write;
- }
- break;
-
- case state_read:
- /* Set ACK if receiving the last byte */
- if (iface->len == 1)
- outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1);
- else
- outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1);
-
- *iface->ptr++ = inb(ACBSDA);
- --iface->len;
-
- if (iface->len == 0) {
- iface->result = 0;
- iface->state = state_idle;
- outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
- }
-
- break;
-
- case state_write:
- if (iface->len == 0) {
- iface->result = 0;
- iface->state = state_idle;
- outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
- break;
- }
-
- outb(*iface->ptr++, ACBSDA);
- --iface->len;
-
- break;
- }
-
- return;
-
- negack:
- DBG("negative acknowledge in state %s\n",
- scx200_acb_state_name[iface->state]);
-
- iface->state = state_idle;
- iface->result = -ENXIO;
-
- outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
- outb(ACBST_STASTR | ACBST_NEGACK, ACBST);
- return;
-
- error:
- dev_err(&iface->adapter.dev, "%s in state %s\n", errmsg,
- scx200_acb_state_name[iface->state]);
-
- iface->state = state_idle;
- iface->result = -EIO;
- iface->needs_reset = 1;
-}
-
-static void scx200_acb_timeout(struct scx200_acb_iface *iface)
-{
- dev_err(&iface->adapter.dev, "timeout in state %s\n",
- scx200_acb_state_name[iface->state]);
-
- iface->state = state_idle;
- iface->result = -EIO;
- iface->needs_reset = 1;
-}
-
-#ifdef POLLED_MODE
-static void scx200_acb_poll(struct scx200_acb_iface *iface)
-{
- u8 status = 0;
- unsigned long timeout;
-
- timeout = jiffies + POLL_TIMEOUT;
- while (time_before(jiffies, timeout)) {
- status = inb(ACBST);
- if ((status & (ACBST_SDAST|ACBST_BER|ACBST_NEGACK)) != 0) {
- scx200_acb_machine(iface, status);
- return;
- }
- schedule_timeout(HZ/100+1);
- }
-
- scx200_acb_timeout(iface);
-}
-#endif /* POLLED_MODE */
-
-static void scx200_acb_reset(struct scx200_acb_iface *iface)
-{
- /* Disable the ACCESS.bus device and Configure the SCL
- frequency: 16 clock cycles */
- outb(0x70, ACBCTL2);
- /* Polling mode */
- outb(0, ACBCTL1);
- /* Disable slave address */
- outb(0, ACBADDR);
- /* Enable the ACCESS.bus device */
- outb(inb(ACBCTL2) | ACBCTL2_ENABLE, ACBCTL2);
- /* Free STALL after START */
- outb(inb(ACBCTL1) & ~(ACBCTL1_STASTRE | ACBCTL1_NMINTE), ACBCTL1);
- /* Send a STOP */
- outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
- /* Clear BER, NEGACK and STASTR bits */
- outb(ACBST_BER | ACBST_NEGACK | ACBST_STASTR, ACBST);
- /* Clear BB bit */
- outb(inb(ACBCST) | ACBCST_BB, ACBCST);
-}
-
-static s32 scx200_acb_smbus_xfer(struct i2c_adapter *adapter,
- u16 address, unsigned short flags,
- char rw, u8 command, int size,
- union i2c_smbus_data *data)
-{
- struct scx200_acb_iface *iface = i2c_get_adapdata(adapter);
- int len;
- u8 *buffer;
- u16 cur_word;
- int rc;
-
- switch (size) {
- case I2C_SMBUS_QUICK:
- len = 0;
- buffer = NULL;
- break;
- case I2C_SMBUS_BYTE:
- if (rw == I2C_SMBUS_READ) {
- len = 1;
- buffer = &data->byte;
- } else {
- len = 1;
- buffer = &command;
- }
- break;
- case I2C_SMBUS_BYTE_DATA:
- len = 1;
- buffer = &data->byte;
- break;
- case I2C_SMBUS_WORD_DATA:
- len = 2;
- cur_word = cpu_to_le16(data->word);
- buffer = (u8 *)&cur_word;
- break;
- case I2C_SMBUS_BLOCK_DATA:
- len = data->block[0];
- buffer = &data->block[1];
- break;
- default:
- return -EINVAL;
- }
-
- DBG("size=%d, address=0x%x, command=0x%x, len=%d, read=%d\n",
- size, address, command, len, rw == I2C_SMBUS_READ);
-
- if (!len && rw == I2C_SMBUS_READ) {
- dev_warn(&adapter->dev, "zero length read\n");
- return -EINVAL;
- }
-
- if (len && !buffer) {
- dev_warn(&adapter->dev, "nonzero length but no buffer\n");
- return -EFAULT;
- }
-
- down(&iface->sem);
-
- iface->address_byte = address<<1;
- if (rw == I2C_SMBUS_READ)
- iface->address_byte |= 1;
- iface->command = command;
- iface->ptr = buffer;
- iface->len = len;
- iface->result = -EINVAL;
- iface->needs_reset = 0;
-
- outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1);
-
- if (size == I2C_SMBUS_QUICK || size == I2C_SMBUS_BYTE)
- iface->state = state_quick;
- else
- iface->state = state_address;
-
-#ifdef POLLED_MODE
- while (iface->state != state_idle)
- scx200_acb_poll(iface);
-#else /* POLLED_MODE */
-#error Interrupt driven mode not implemented
-#endif /* POLLED_MODE */
-
- if (iface->needs_reset)
- scx200_acb_reset(iface);
-
- rc = iface->result;
-
- up(&iface->sem);
-
- if (rc == 0 && size == I2C_SMBUS_WORD_DATA && rw == I2C_SMBUS_READ)
- data->word = le16_to_cpu(cur_word);
-
-#if DEBUG
- printk(KERN_DEBUG NAME ": transfer done, result: %d", rc);
- if (buffer) {
- int i;
- printk(" data:");
- for (i = 0; i < len; ++i)
- printk(" %02x", buffer[i]);
- }
- printk("\n");
-#endif
-
- return rc;
-}
-
-static u32 scx200_acb_func(struct i2c_adapter *adapter)
-{
- return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
- I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
- I2C_FUNC_SMBUS_BLOCK_DATA;
-}
-
-/* For now, we only handle combined mode (smbus) */
-static struct i2c_algorithm scx200_acb_algorithm = {
- .name = "NatSemi SCx200 ACCESS.bus",
- .id = I2C_ALGO_SMBUS,
- .smbus_xfer = scx200_acb_smbus_xfer,
- .functionality = scx200_acb_func,
-};
-
-struct scx200_acb_iface *scx200_acb_list;
-
-int scx200_acb_probe(struct scx200_acb_iface *iface)
-{
- u8 val;
-
- /* Disable the ACCESS.bus device and Configure the SCL
- frequency: 16 clock cycles */
- outb(0x70, ACBCTL2);
-
- if (inb(ACBCTL2) != 0x70) {
- DBG("ACBCTL2 readback failed\n");
- return -ENXIO;
- }
-
- outb(inb(ACBCTL1) | ACBCTL1_NMINTE, ACBCTL1);
-
- val = inb(ACBCTL1);
- if (val) {
- DBG("disabled, but ACBCTL1=0x%02x\n", val);
- return -ENXIO;
- }
-
- outb(inb(ACBCTL2) | ACBCTL2_ENABLE, ACBCTL2);
-
- outb(inb(ACBCTL1) | ACBCTL1_NMINTE, ACBCTL1);
-
- val = inb(ACBCTL1);
- if ((val & ACBCTL1_NMINTE) != ACBCTL1_NMINTE) {
- DBG("enabled, but NMINTE won't be set, ACBCTL1=0x%02x\n", val);
- return -ENXIO;
- }
-
- return 0;
-}
-
-static int __init scx200_acb_create(int base, int index)
-{
- struct scx200_acb_iface *iface;
- struct i2c_adapter *adapter;
- int rc = 0;
- char description[64];
-
- iface = kmalloc(sizeof(*iface), GFP_KERNEL);
- if (!iface) {
- printk(KERN_ERR NAME ": can't allocate memory\n");
- rc = -ENOMEM;
- goto errout;
- }
-
- memset(iface, 0, sizeof(*iface));
- adapter = &iface->adapter;
- i2c_set_adapdata(adapter, iface);
- snprintf(adapter->name, I2C_NAME_SIZE, "SCx200 ACB%d", index);
- adapter->owner = THIS_MODULE;
- adapter->id = I2C_ALGO_SMBUS;
- adapter->algo = &scx200_acb_algorithm;
-
- init_MUTEX(&iface->sem);
-
- snprintf(description, sizeof(description), "NatSemi SCx200 ACCESS.bus [%s]", adapter->name);
- if (request_region(base, 8, description) == 0) {
- dev_err(&adapter->dev, "can't allocate io 0x%x-0x%x\n",
- base, base + 8-1);
- rc = -EBUSY;
- goto errout;
- }
- iface->base = base;
-
- rc = scx200_acb_probe(iface);
- if (rc) {
- dev_warn(&adapter->dev, "probe failed\n");
- goto errout;
- }
-
- scx200_acb_reset(iface);
-
- if (i2c_add_adapter(adapter) < 0) {
- dev_err(&adapter->dev, "failed to register\n");
- rc = -ENODEV;
- goto errout;
- }
-
- lock_kernel();
- iface->next = scx200_acb_list;
- scx200_acb_list = iface;
- unlock_kernel();
-
- return 0;
-
- errout:
- if (iface) {
- if (iface->base)
- release_region(iface->base, 8);
- kfree(iface);
- }
- return rc;
-}
-
-static int __init scx200_acb_init(void)
-{
- int i;
- int rc;
-
- printk(KERN_DEBUG NAME ": NatSemi SCx200 ACCESS.bus Driver\n");
-
- /* Verify that this really is a SCx200 processor */
- if (pci_find_device(PCI_VENDOR_ID_NS,
- PCI_DEVICE_ID_NS_SCx200_BRIDGE,
- NULL) == NULL)
- return -ENODEV;
-
- rc = -ENXIO;
- for (i = 0; i < MAX_DEVICES; ++i) {
- if (base[i] > 0)
- rc = scx200_acb_create(base[i], i);
- }
- if (scx200_acb_list)
- return 0;
- return rc;
-}
-
-static void __exit scx200_acb_cleanup(void)
-{
- struct scx200_acb_iface *iface;
- lock_kernel();
- while ((iface = scx200_acb_list) != NULL) {
- scx200_acb_list = iface->next;
- unlock_kernel();
-
- i2c_del_adapter(&iface->adapter);
- release_region(iface->base, 8);
- kfree(iface);
- lock_kernel();
- }
- unlock_kernel();
-}
-
-module_init(scx200_acb_init);
-module_exit(scx200_acb_cleanup);
-
-/*
- Local variables:
- compile-command: "make -k -C ../.. SUBDIRS=drivers/i2c modules"
- c-basic-offset: 8
- End:
-*/
-
diff -Nru a/drivers/i2c/scx200_i2c.c b/drivers/i2c/scx200_i2c.c
--- a/drivers/i2c/scx200_i2c.c Mon Sep 22 16:12:15 2003
+++ /dev/null Wed Dec 31 16:00:00 1969
@@ -1,133 +0,0 @@
-/* linux/drivers/i2c/scx200_i2c.c
-
- Copyright (c) 2001,2002 Christer Weinigel <wingel@xxxxxxxxxxxxxxx>
-
- National Semiconductor SCx200 I2C bus on GPIO pins
-
- Based on i2c-velleman.c Copyright (C) 1995-96, 2000 Simon G. Vogl
-
- 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/module.h>
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/i2c.h>
-#include <linux/i2c-algo-bit.h>
-#include <asm/io.h>
-
-#include <linux/scx200_gpio.h>
-
-#define NAME "scx200_i2c"
-
-MODULE_AUTHOR("Christer Weinigel <wingel@xxxxxxxxxxxxxxx>");
-MODULE_DESCRIPTION("NatSemi SCx200 I2C Driver");
-MODULE_LICENSE("GPL");
-
-MODULE_PARM(scl, "i");
-MODULE_PARM_DESC(scl, "GPIO line for SCL");
-MODULE_PARM(sda, "i");
-MODULE_PARM_DESC(sda, "GPIO line for SDA");
-
-static int scl = CONFIG_SCx200_I2C_SCL;
-static int sda = CONFIG_SCx200_I2C_SDA;
-
-static void scx200_i2c_setscl(void *data, int state)
-{
- scx200_gpio_set(scl, state);
-}
-
-static void scx200_i2c_setsda(void *data, int state)
-{
- scx200_gpio_set(sda, state);
-}
-
-static int scx200_i2c_getscl(void *data)
-{
- return scx200_gpio_get(scl);
-}
-
-static int scx200_i2c_getsda(void *data)
-{
- return scx200_gpio_get(sda);
-}
-
-/* ------------------------------------------------------------------------
- * Encapsulate the above functions in the correct operations structure.
- * This is only done when more than one hardware adapter is supported.
- */
-
-static struct i2c_algo_bit_data scx200_i2c_data = {
- NULL,
- scx200_i2c_setsda,
- scx200_i2c_setscl,
- scx200_i2c_getsda,
- scx200_i2c_getscl,
- 10, 10, 100, /* waits, timeout */
-};
-
-static struct i2c_adapter scx200_i2c_ops = {
- .owner = THIS_MODULE,
- .id = I2C_HW_B_VELLE,
- .algo_data = &scx200_i2c_data,
- .name = "NatSemi SCx200 I2C",
-};
-
-int scx200_i2c_init(void)
-{
- printk(KERN_DEBUG NAME ": NatSemi SCx200 I2C Driver\n");
-
- if (!scx200_gpio_present()) {
- printk(KERN_ERR NAME ": no SCx200 gpio pins available\n");
- return -ENODEV;
- }
-
- printk(KERN_DEBUG NAME ": SCL=GPIO%02u, SDA=GPIO%02u\n",
- scl, sda);
-
- if (scl == -1 || sda == -1 || scl == sda) {
- printk(KERN_ERR NAME ": scl and sda must be specified\n");
- return -EINVAL;
- }
-
- /* Configure GPIOs as open collector outputs */
- scx200_gpio_configure(scl, ~2, 5);
- scx200_gpio_configure(sda, ~2, 5);
-
- if (i2c_bit_add_bus(&scx200_i2c_ops) < 0) {
- printk(KERN_ERR NAME ": adapter %s registration failed\n",
- scx200_i2c_ops.name);
- return -ENODEV;
- }
-
- return 0;
-}
-
-void scx200_i2c_cleanup(void)
-{
- i2c_bit_del_bus(&scx200_i2c_ops);
-}
-
-module_init(scx200_i2c_init);
-module_exit(scx200_i2c_cleanup);
-
-/*
- Local variables:
- compile-command: "make -k -C ../.. SUBDIRS=drivers/i2c modules"
- c-basic-offset: 8
- End:
-*/
-
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