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-rw-r--r--drivers/i2c/busses/scx200_acb.c90
1 files changed, 43 insertions, 47 deletions
diff --git a/drivers/i2c/busses/scx200_acb.c b/drivers/i2c/busses/scx200_acb.c
index d3478e084522..f45779b76908 100644
--- a/drivers/i2c/busses/scx200_acb.c
+++ b/drivers/i2c/busses/scx200_acb.c
@@ -1,27 +1,25 @@
-/* linux/drivers/i2c/scx200_acb.c
-
+/*
Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
National Semiconductor SCx200 ACCESS.bus support
-
+
Based on i2c-keywest.c which is:
Copyright (c) 2001 Benjamin Herrenschmidt <benh@kernel.crashing.org>
Copyright (c) 2000 Philip Edelbrock <phil@stimpy.netroedge.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., 675 Mass Ave, Cambridge, MA 02139, USA.
-
*/
#include <linux/module.h>
@@ -79,8 +77,7 @@ static const char *scx200_acb_state_name[] = {
};
/* Physical interface */
-struct scx200_acb_iface
-{
+struct scx200_acb_iface {
struct scx200_acb_iface *next;
struct i2c_adapter adapter;
unsigned base;
@@ -100,7 +97,7 @@ struct scx200_acb_iface
#define ACBSDA (iface->base + 0)
#define ACBST (iface->base + 1)
#define ACBST_SDAST 0x40 /* SDA Status */
-#define ACBST_BER 0x20
+#define ACBST_BER 0x20
#define ACBST_NEGACK 0x10 /* Negative Acknowledge */
#define ACBST_STASTR 0x08 /* Stall After Start */
#define ACBST_MASTER 0x02
@@ -109,9 +106,9 @@ struct scx200_acb_iface
#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 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
@@ -122,7 +119,7 @@ static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status)
{
const char *errmsg;
- DBG("state %s, status = 0x%02x\n",
+ DBG("state %s, status = 0x%02x\n",
scx200_acb_state_name[iface->state], status);
if (status & ACBST_BER) {
@@ -160,10 +157,10 @@ static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status)
case state_repeat_start:
outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1);
/* fallthrough */
-
+
case state_quick:
if (iface->address_byte & 1) {
- if (iface->len == 1)
+ if (iface->len == 1)
outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1);
else
outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1);
@@ -202,17 +199,17 @@ static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status)
outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
break;
}
-
+
outb(*iface->ptr++, ACBSDA);
--iface->len;
-
+
break;
}
return;
negack:
- DBG("negative acknowledge in state %s\n",
+ DBG("negative acknowledge in state %s\n",
scx200_acb_state_name[iface->state]);
iface->state = state_idle;
@@ -231,7 +228,7 @@ static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status)
iface->needs_reset = 1;
}
-static void scx200_acb_timeout(struct scx200_acb_iface *iface)
+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]);
@@ -264,7 +261,7 @@ static void scx200_acb_poll(struct scx200_acb_iface *iface)
static void scx200_acb_reset(struct scx200_acb_iface *iface)
{
/* Disable the ACCESS.bus device and Configure the SCL
- frequency: 16 clock cycles */
+ frequency: 16 clock cycles */
outb(0x70, ACBCTL2);
/* Polling mode */
outb(0, ACBCTL1);
@@ -283,9 +280,9 @@ static void scx200_acb_reset(struct scx200_acb_iface *iface)
}
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)
+ 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;
@@ -295,9 +292,10 @@ static s32 scx200_acb_smbus_xfer(struct i2c_adapter *adapter,
switch (size) {
case I2C_SMBUS_QUICK:
- len = 0;
- buffer = NULL;
- break;
+ len = 0;
+ buffer = NULL;
+ break;
+
case I2C_SMBUS_BYTE:
if (rw == I2C_SMBUS_READ) {
len = 1;
@@ -306,22 +304,26 @@ static s32 scx200_acb_smbus_xfer(struct i2c_adapter *adapter,
len = 1;
buffer = &command;
}
- break;
+ break;
+
case I2C_SMBUS_BYTE_DATA:
- len = 1;
- buffer = &data->byte;
- break;
+ len = 1;
+ buffer = &data->byte;
+ break;
+
case I2C_SMBUS_WORD_DATA:
len = 2;
- cur_word = cpu_to_le16(data->word);
- buffer = (u8 *)&cur_word;
+ 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];
+ len = data->block[0];
+ buffer = &data->block[1];
break;
+
default:
- return -EINVAL;
+ return -EINVAL;
}
DBG("size=%d, address=0x%x, command=0x%x, len=%d, read=%d\n",
@@ -370,7 +372,7 @@ static s32 scx200_acb_smbus_xfer(struct i2c_adapter *adapter,
up(&iface->sem);
if (rc == 0 && size == I2C_SMBUS_WORD_DATA && rw == I2C_SMBUS_READ)
- data->word = le16_to_cpu(cur_word);
+ data->word = le16_to_cpu(cur_word);
#ifdef DEBUG
DBG(": transfer done, result: %d", rc);
@@ -406,7 +408,7 @@ static int scx200_acb_probe(struct scx200_acb_iface *iface)
u8 val;
/* Disable the ACCESS.bus device and Configure the SCL
- frequency: 16 clock cycles */
+ frequency: 16 clock cycles */
outb(0x70, ACBCTL2);
if (inb(ACBCTL2) != 0x70) {
@@ -459,7 +461,8 @@ static int __init scx200_acb_create(int base, int index)
init_MUTEX(&iface->sem);
- snprintf(description, sizeof(description), "NatSemi SCx200 ACCESS.bus [%s]", adapter->name);
+ 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);
@@ -528,6 +531,7 @@ static int __init scx200_acb_init(void)
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;
@@ -543,11 +547,3 @@ static void __exit scx200_acb_cleanup(void)
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:
-*/
-
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 15:11:50 +0000