Commit 857d0ea3 authored by 吴智聪John's avatar 吴智聪John

msp430 i2c driver for davinci work

parent 253571f7
...@@ -198,4 +198,16 @@ config GPIOEXPANDER_DAVINCI ...@@ -198,4 +198,16 @@ config GPIOEXPANDER_DAVINCI
help help
If you say yes here you get support for I/O expander calls If you say yes here you get support for I/O expander calls
config I2C_NEUROS_MSP430
tristate "Neuros MSP430 interface"
depends on I2C && ARCH_DAVINCI
help
Supports the I2C interface found on the Neuros OSD (primarily used
for communicating with the MSP430 IR controller chip).
To compile this driver as a module (recommended), choose M here: the
module will be called i2c-neuros-msp430.
If unsure and targeting the Neuros OSD, say M.
endmenu endmenu
...@@ -21,6 +21,7 @@ obj-$(CONFIG_TWL4030_CORE) += twl4030_core.o ...@@ -21,6 +21,7 @@ obj-$(CONFIG_TWL4030_CORE) += twl4030_core.o
obj-$(CONFIG_TWL4030_GPIO) += twl4030_gpio.o obj-$(CONFIG_TWL4030_GPIO) += twl4030_gpio.o
obj-$(CONFIG_RTC_X1205_I2C) += x1205.o obj-$(CONFIG_RTC_X1205_I2C) += x1205.o
obj-$(CONFIG_GPIOEXPANDER_DAVINCI) += gpio_expander_davinci.o obj-$(CONFIG_GPIOEXPANDER_DAVINCI) += gpio_expander_davinci.o
obj-$(CONFIG_I2C_NEUROS_MSP430) += i2c-neuros-msp430.o
ifeq ($(CONFIG_I2C_DEBUG_CHIP),y) ifeq ($(CONFIG_I2C_DEBUG_CHIP),y)
EXTRA_CFLAGS += -DDEBUG EXTRA_CFLAGS += -DDEBUG
......
/*
* Copyright(C) 2006-2007 Neuros Technology International LLC.
* <www.neurostechnology.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, version 2 of the License.
*
* This program is distributed in the hope that, in addition to its
* original purpose to support Neuros hardware, it will be useful
* otherwise, 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.
*
****************************************************************************
*
* MSP430 i2c driver.
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/kthread.h>
#include <linux/jiffies.h>
#include <linux/poll.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/arch/hardware.h>
#if 0
#define dbg(fmt, arg...) \
printk(KERN_INFO "%s:%d> " fmt, __func__, __LINE__ , ## arg)
#else
#define dbg(fmt, arg...)
#endif
//TODO: the sleep time should be tweaked to some value between 100 and 200 ms. 200ms sure works, but maybe it's too much. 100 doesn't work well. --nerochiaro
#define I2C_RETRY_SLEEP 200
#define I2C_RETRY_COUNT 3
#define MOD_DESC "MSP430 I2C Driver (c) 2008"
static int irrtc_attach_adapter(struct i2c_adapter * adapter);
static int irrtc_detach_client(struct i2c_client * client);
static unsigned short normal_i2c[] = {
0x59, /* 7-bit address does not require >> 1 */
I2C_CLIENT_END
};
/*
static unsigned short normal_i2c_range[] = {
I2C_CLIENT_END
};
*/
I2C_CLIENT_INSMOD;
static struct i2c_client* irrtc_client = NULL;
static struct i2c_driver irrtc_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "MSP430 I2C v.$Revision: 1.24 $",
//.flags = I2C_DF_NOTIFY,
},
.id = I2C_DRIVERID_IRRTC,
.attach_adapter = irrtc_attach_adapter,
.detach_client = irrtc_detach_client,
};
static const char * pname = "MPS430_I2C(KM):";
int i2c_write(u8 reg, u16 value)
{
int retry = I2C_RETRY_COUNT;
int ret = -1;
if(irrtc_client)
{
while(retry--)
{
ret = i2c_smbus_write_byte_data(irrtc_client, reg, value & 0xFF);
if (-1 != ret) break;
printk("(msp430(i2c_write)) retry [%d]\n", retry);
msleep(I2C_RETRY_SLEEP);
}
return ret;
}
else
return 0xff;
}
EXPORT_SYMBOL(i2c_write);
int i2c_read(u8 reg)
{
int retry = I2C_RETRY_COUNT;
int dat;
if(irrtc_client)
{
while(retry--)
{
dat = i2c_smbus_read_byte_data(irrtc_client, reg);
if (-1 != dat) break;
printk("(msp430(i2c_read)) retry [%d]\n", retry);
msleep(I2C_RETRY_SLEEP);
}
return dat;
}
else
return 0xff;
}
EXPORT_SYMBOL(i2c_read);
static int irrtc_detect_client(struct i2c_adapter * adapter, int address, int kind)
{
int ret = 0;
struct i2c_client* client = NULL;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
{
dbg("ERROR returned from i2c_check_functionality");
ret = -1;
goto out;
}
if (!(client = kmalloc(sizeof(*client), GFP_KERNEL)))
{
dbg("ERROR error returned from kmalloc");
ret = -ENOMEM;
goto out;
}
memset(client, 0, sizeof(struct i2c_client));
client->addr = address;
client->adapter = adapter;
client->driver = &irrtc_driver;
client->flags = I2C_M_IGNORE_NAK;
strcpy(client->name, "irrtc");
if ((ret = i2c_attach_client(client)) != 0)
{
dbg("%s Unable to attach client.\n", pname);
//kfree(client);
ret = -1;
goto out;
}
irrtc_client = client;
#if 0
printk("Reading remote ID\n");
printk("Register:Value 0x%02X:0x%02X\n", 0x36, i2c_read(0x36));
#endif
out:
return ret;
}
static int irrtc_attach_adapter(struct i2c_adapter * adapter)
{
return(i2c_probe(adapter, &addr_data, &irrtc_detect_client));
}
static int irrtc_detach_client(struct i2c_client * client)
{
int ret = 0;
if ((ret = i2c_detach_client(client)) != 0)
{
dbg("%s Unable to detach client.\n", pname);
goto out;
}
kfree(client);
out:
return ret;
}
//---------------------------------------------------------- INIT / EXIT ---------------------------------------------------------
static int __init irrtc_init(void)
{
int status = 0;
printk(KERN_INFO "\t" MOD_DESC "\n");
if ((status = i2c_add_driver(&irrtc_driver)) < 0)
{
printk(KERN_INFO "%s Couldn't register MSP430 I2C driver.\n", pname);
goto out;
}
out:
return status;
}
static void __exit irrtc_exit(void)
{
i2c_del_driver(&irrtc_driver);
}
MODULE_AUTHOR("Neuros");
MODULE_DESCRIPTION(MOD_DESC);
MODULE_LICENSE("Neuros Technology LLC");
module_init(irrtc_init);
module_exit(irrtc_exit);
...@@ -121,6 +121,8 @@ ...@@ -121,6 +121,8 @@
#define I2C_DRIVERID_LM4857 92 /* LM4857 Audio Amplifier */ #define I2C_DRIVERID_LM4857 92 /* LM4857 Audio Amplifier */
#define I2C_DRIVERID_MISC 99 /* Whatever until sorted out */ #define I2C_DRIVERID_MISC 99 /* Whatever until sorted out */
#define I2C_DRIVERID_IRRTC 0xF9 /* Neuros IR & RTC */
#define I2C_DRIVERID_I2CDEV 900 #define I2C_DRIVERID_I2CDEV 900
#define I2C_DRIVERID_ARP 902 /* SMBus ARP Client */ #define I2C_DRIVERID_ARP 902 /* SMBus ARP Client */
......
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