diff options
Diffstat (limited to 'drivers/i2c/algos/i2c-algo-ite.c')
| -rw-r--r-- | drivers/i2c/algos/i2c-algo-ite.c | 812 |
1 files changed, 812 insertions, 0 deletions
diff --git a/drivers/i2c/algos/i2c-algo-ite.c b/drivers/i2c/algos/i2c-algo-ite.c new file mode 100644 index 000000000000..68e9e6832ca0 --- /dev/null +++ b/drivers/i2c/algos/i2c-algo-ite.c @@ -0,0 +1,812 @@ +/* + ------------------------------------------------------------------------- + i2c-algo-ite.c i2c driver algorithms for ITE adapters + + Hai-Pao Fan, MontaVista Software, Inc. + hpfan@mvista.com or source@mvista.com + + Copyright 2000 MontaVista Software Inc. + + --------------------------------------------------------------------------- + This file was highly leveraged from i2c-algo-pcf.c, which was created + by Simon G. Vogl and Hans Berglund: + + + Copyright (C) 1995-1997 Simon G. Vogl + 1998-2000 Hans Berglund + + 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. */ +/* ------------------------------------------------------------------------- */ + +/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and + Frodo Looijaard <frodol@dds.nl> ,and also from Martin Bailey + <mbailey@littlefeet-inc.com> */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <asm/uaccess.h> +#include <linux/ioport.h> +#include <linux/errno.h> +#include <linux/sched.h> + +#include <linux/i2c.h> +#include <linux/i2c-algo-ite.h> +#include "i2c-algo-ite.h" + +#define PM_DSR IT8172_PCI_IO_BASE + IT_PM_DSR +#define PM_IBSR IT8172_PCI_IO_BASE + IT_PM_DSR + 0x04 +#define GPIO_CCR IT8172_PCI_IO_BASE + IT_GPCCR + +#define DEB2(x) if (i2c_debug>=2) x +#define DEB3(x) if (i2c_debug>=3) x /* print several statistical values*/ +#define DEF_TIMEOUT 16 + + +/* module parameters: + */ +static int i2c_debug; +static int iic_test; /* see if the line-setting functions work */ + +/* --- setting states on the bus with the right timing: --------------- */ + +#define get_clock(adap) adap->getclock(adap->data) +#define iic_outw(adap, reg, val) adap->setiic(adap->data, reg, val) +#define iic_inw(adap, reg) adap->getiic(adap->data, reg) + + +/* --- other auxiliary functions -------------------------------------- */ + +static void iic_start(struct i2c_algo_iic_data *adap) +{ + iic_outw(adap,ITE_I2CHCR,ITE_CMD); +} + +static void iic_stop(struct i2c_algo_iic_data *adap) +{ + iic_outw(adap,ITE_I2CHCR,0); + iic_outw(adap,ITE_I2CHSR,ITE_I2CHSR_TDI); +} + +static void iic_reset(struct i2c_algo_iic_data *adap) +{ + iic_outw(adap, PM_IBSR, iic_inw(adap, PM_IBSR) | 0x80); +} + + +static int wait_for_bb(struct i2c_algo_iic_data *adap) +{ + int timeout = DEF_TIMEOUT; + short status; + + status = iic_inw(adap, ITE_I2CHSR); +#ifndef STUB_I2C + while (timeout-- && (status & ITE_I2CHSR_HB)) { + udelay(1000); /* How much is this? */ + status = iic_inw(adap, ITE_I2CHSR); + } +#endif + if (timeout<=0) { + printk(KERN_ERR "Timeout, host is busy\n"); + iic_reset(adap); + } + return(timeout<=0); +} + +/* After we issue a transaction on the IIC bus, this function + * is called. It puts this process to sleep until we get an interrupt from + * from the controller telling us that the transaction we requested in complete. + */ +static int wait_for_pin(struct i2c_algo_iic_data *adap, short *status) { + + int timeout = DEF_TIMEOUT; + + timeout = wait_for_bb(adap); + if (timeout) { + DEB2(printk("Timeout waiting for host not busy\n");) + return -EIO; + } + timeout = DEF_TIMEOUT; + + *status = iic_inw(adap, ITE_I2CHSR); +#ifndef STUB_I2C + while (timeout-- && !(*status & ITE_I2CHSR_TDI)) { + adap->waitforpin(); + *status = iic_inw(adap, ITE_I2CHSR); + } +#endif + if (timeout <= 0) + return(-1); + else + return(0); +} + +static int wait_for_fe(struct i2c_algo_iic_data *adap, short *status) +{ + int timeout = DEF_TIMEOUT; + + *status = iic_inw(adap, ITE_I2CFSR); +#ifndef STUB_I2C + while (timeout-- && (*status & ITE_I2CFSR_FE)) { + udelay(1000); + iic_inw(adap, ITE_I2CFSR); + } +#endif + if (timeout <= 0) + return(-1); + else + return(0); +} + +static int iic_init (struct i2c_algo_iic_data *adap) +{ + short i; + + /* Clear bit 7 to set I2C to normal operation mode */ + i=iic_inw(adap, PM_DSR)& 0xff7f; + iic_outw(adap, PM_DSR, i); + + /* set IT_GPCCR port C bit 2&3 as function 2 */ + i = iic_inw(adap, GPIO_CCR) & 0xfc0f; + iic_outw(adap,GPIO_CCR,i); + + /* Clear slave address/sub-address */ + iic_outw(adap,ITE_I2CSAR, 0); + iic_outw(adap,ITE_I2CSSAR, 0); + + /* Set clock counter register */ + iic_outw(adap,ITE_I2CCKCNT, get_clock(adap)); + + /* Set START/reSTART/STOP time registers */ + iic_outw(adap,ITE_I2CSHDR, 0x0a); + iic_outw(adap,ITE_I2CRSUR, 0x0a); + iic_outw(adap,ITE_I2CPSUR, 0x0a); + + /* Enable interrupts on completing the current transaction */ + iic_outw(adap,ITE_I2CHCR, ITE_I2CHCR_IE | ITE_I2CHCR_HCE); + + /* Clear transfer count */ + iic_outw(adap,ITE_I2CFBCR, 0x0); + + DEB2(printk("iic_init: Initialized IIC on ITE 0x%x\n", + iic_inw(adap, ITE_I2CHSR))); + return 0; +} + + +/* + * Sanity check for the adapter hardware - check the reaction of + * the bus lines only if it seems to be idle. + */ +static int test_bus(struct i2c_algo_iic_data *adap, char *name) { +#if 0 + int scl,sda; + sda=getsda(adap); + if (adap->getscl==NULL) { + printk("test_bus: Warning: Adapter can't read from clock line - skipping test.\n"); + return 0; + } + scl=getscl(adap); + printk("test_bus: Adapter: %s scl: %d sda: %d -- testing...\n", + name,getscl(adap),getsda(adap)); + if (!scl || !sda ) { + printk("test_bus: %s seems to be busy.\n",adap->name); + goto bailout; + } + sdalo(adap); + printk("test_bus:1 scl: %d sda: %d \n",getscl(adap), + getsda(adap)); + if ( 0 != getsda(adap) ) { + printk("test_bus: %s SDA stuck high!\n",name); + sdahi(adap); + goto bailout; + } + if ( 0 == getscl(adap) ) { + printk("test_bus: %s SCL unexpected low while pulling SDA low!\n", + name); + goto bailout; + } + sdahi(adap); + printk("test_bus:2 scl: %d sda: %d \n",getscl(adap), + getsda(adap)); + if ( 0 == getsda(adap) ) { + printk("test_bus: %s SDA stuck low!\n",name); + sdahi(adap); + goto bailout; + } + if ( 0 == getscl(adap) ) { + printk("test_bus: %s SCL unexpected low while SDA high!\n", + adap->name); + goto bailout; + } + scllo(adap); + printk("test_bus:3 scl: %d sda: %d \n",getscl(adap), + getsda(adap)); + if ( 0 != getscl(adap) ) { + + sclhi(adap); + goto bailout; + } + if ( 0 == getsda(adap) ) { + printk("test_bus: %s SDA unexpected low while pulling SCL low!\n", + name); + goto bailout; + } + sclhi(adap); + printk("test_bus:4 scl: %d sda: %d \n",getscl(adap), + getsda(adap)); + if ( 0 == getscl(adap) ) { + printk("test_bus: %s SCL stuck low!\n",name); + sclhi(adap); + goto bailout; + } + if ( 0 == getsda(adap) ) { + printk("test_bus: %s SDA unexpected low while SCL high!\n", + name); + goto bailout; + } + printk("test_bus: %s passed test.\n",name); + return 0; +bailout: + sdahi(adap); + sclhi(adap); + return -ENODEV; +#endif + return (0); +} + +/* ----- Utility functions + */ + + +/* Verify the device we want to talk to on the IIC bus really exists. */ +static inline int try_address(struct i2c_algo_iic_data *adap, + unsigned int addr, int retries) +{ + int i, ret = -1; + short status; + + for (i=0;i<retries;i++) { + iic_outw(adap, ITE_I2CSAR, addr); + iic_start(adap); + if (wait_for_pin(adap, &status) == 0) { + if ((status & ITE_I2CHSR_DNE) == 0) { + iic_stop(adap); + iic_outw(adap, ITE_I2CFCR, ITE_I2CFCR_FLUSH); + ret=1; + break; /* success! */ + } + } + iic_stop(adap); + udelay(adap->udelay); + } + DEB2(if (i) printk("try_address: needed %d retries for 0x%x\n",i, + addr)); + return ret; +} + + +static int iic_sendbytes(struct i2c_adapter *i2c_adap,const char *buf, + int count) +{ + struct i2c_algo_iic_data *adap = i2c_adap->algo_data; + int wrcount=0, timeout; + short status; + int loops, remainder, i, j; + union { + char byte[2]; + unsigned short word; + } tmp; + + iic_outw(adap, ITE_I2CSSAR, (unsigned short)buf[wrcount++]); + count--; + if (count == 0) + return -EIO; + + loops = count / 32; /* 32-byte FIFO */ + remainder = count % 32; + + if(loops) { + for(i=0; i<loops; i++) { + + iic_outw(adap, ITE_I2CFBCR, 32); + for(j=0; j<32/2; j++) { + tmp.byte[1] = buf[wrcount++]; + tmp.byte[0] = buf[wrcount++]; + iic_outw(adap, ITE_I2CFDR, tmp.word); + } + + /* status FIFO overrun */ + iic_inw(adap, ITE_I2CFSR); + iic_inw(adap, ITE_I2CFBCR); + + iic_outw(adap, ITE_I2CHCR, ITE_WRITE); /* Issue WRITE command */ + + /* Wait for transmission to complete */ + timeout = wait_for_pin(adap, &status); + if(timeout) { + iic_stop(adap); + printk("iic_sendbytes: %s write timeout.\n", i2c_adap->name); + return -EREMOTEIO; /* got a better one ?? */ + } + if (status & ITE_I2CHSR_DB) { + iic_stop(adap); + printk("iic_sendbytes: %s write error - no ack.\n", i2c_adap->name); + return -EREMOTEIO; /* got a better one ?? */ + } + } + } + if(remainder) { + iic_outw(adap, ITE_I2CFBCR, remainder); + for(i=0; i<remainder/2; i++) { + tmp.byte[1] = buf[wrcount++]; + tmp.byte[0] = buf[wrcount++]; + iic_outw(adap, ITE_I2CFDR, tmp.word); + } + + /* status FIFO overrun */ + iic_inw(adap, ITE_I2CFSR); + iic_inw(adap, ITE_I2CFBCR); + + iic_outw(adap, ITE_I2CHCR, ITE_WRITE); /* Issue WRITE command */ + + timeout = wait_for_pin(adap, &status); + if(timeout) { + iic_stop(adap); + printk("iic_sendbytes: %s write timeout.\n", i2c_adap->name); + return -EREMOTEIO; /* got a better one ?? */ + } +#ifndef STUB_I2C + if (status & ITE_I2CHSR_DB) { + iic_stop(adap); + printk("iic_sendbytes: %s write error - no ack.\n", i2c_adap->name); + return -EREMOTEIO; /* got a better one ?? */ + } +#endif + } + iic_stop(adap); + return wrcount; +} + + +static int iic_readbytes(struct i2c_adapter *i2c_adap, char *buf, int count, + int sread) +{ + int rdcount=0, i, timeout; + short status; + struct i2c_algo_iic_data *adap = i2c_adap->algo_data; + int loops, remainder, j; + union { + char byte[2]; + unsigned short word; + } tmp; + + loops = count / 32; /* 32-byte FIFO */ + remainder = count % 32; + + if(loops) { + for(i=0; i<loops; i++) { + iic_outw(adap, ITE_I2CFBCR, 32); + if (sread) + iic_outw(adap, ITE_I2CHCR, ITE_SREAD); + else + iic_outw(adap, ITE_I2CHCR, ITE_READ); /* Issue READ command */ + + timeout = wait_for_pin(adap, &status); + if(timeout) { + iic_stop(adap); + printk("iic_readbytes: %s read timeout.\n", i2c_adap->name); + return (-1); + } +#ifndef STUB_I2C + if (status & ITE_I2CHSR_DB) { + iic_stop(adap); + printk("iic_readbytes: %s read error - no ack.\n", i2c_adap->name); + return (-1); + } +#endif + + timeout = wait_for_fe(adap, &status); + if(timeout) { + iic_stop(adap); + printk("iic_readbytes: %s FIFO is empty\n", i2c_adap->name); + return (-1); + } + + for(j=0; j<32/2; j++) { + tmp.word = iic_inw(adap, ITE_I2CFDR); + buf[rdcount++] = tmp.byte[1]; + buf[rdcount++] = tmp.byte[0]; + } + + /* status FIFO underrun */ + iic_inw(adap, ITE_I2CFSR); + + } + } + + + if(remainder) { + remainder=(remainder+1)/2 * 2; + iic_outw(adap, ITE_I2CFBCR, remainder); + if (sread) + iic_outw(adap, ITE_I2CHCR, ITE_SREAD); + else + iic_outw(adap, ITE_I2CHCR, ITE_READ); /* Issue READ command */ + + timeout = wait_for_pin(adap, &status); + if(timeout) { + iic_stop(adap); + printk("iic_readbytes: %s read timeout.\n", i2c_adap->name); + return (-1); + } +#ifndef STUB_I2C + if (status & ITE_I2CHSR_DB) { + iic_stop(adap); + printk("iic_readbytes: %s read error - no ack.\n", i2c_adap->name); + return (-1); + } +#endif + timeout = wait_for_fe(adap, &status); + if(timeout) { + iic_stop(adap); + printk("iic_readbytes: %s FIFO is empty\n", i2c_adap->name); + return (-1); + } + + for(i=0; i<(remainder+1)/2; i++) { + tmp.word = iic_inw(adap, ITE_I2CFDR); + buf[rdcount++] = tmp.byte[1]; + buf[rdcount++] = tmp.byte[0]; + } + + /* status FIFO underrun */ + iic_inw(adap, ITE_I2CFSR); + + } + + iic_stop(adap); + return rdcount; +} + + +/* This function implements combined transactions. Combined + * transactions consist of combinations of reading and writing blocks of data. + * Each transfer (i.e. a read or a write) is separated by a repeated start + * condition. + */ +#if 0 +static int iic_combined_transaction(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num) +{ + int i; + struct i2c_msg *pmsg; + int ret; + + DEB2(printk("Beginning combined transaction\n")); + + for(i=0; i<(num-1); i++) { + pmsg = &msgs[i]; + if(pmsg->flags & I2C_M_RD) { + DEB2(printk(" This one is a read\n")); + ret = iic_readbytes(i2c_adap, pmsg->buf, pmsg->len, IIC_COMBINED_XFER); + } + else if(!(pmsg->flags & I2C_M_RD)) { + DEB2(printk("This one is a write\n")); + ret = iic_sendbytes(i2c_adap, pmsg->buf, pmsg->len, IIC_COMBINED_XFER); + } + } + /* Last read or write segment needs to be terminated with a stop */ + pmsg = &msgs[i]; + + if(pmsg->flags & I2C_M_RD) { + DEB2(printk("Doing the last read\n")); + ret = iic_readbytes(i2c_adap, pmsg->buf, pmsg->len, IIC_SINGLE_XFER); + } + else if(!(pmsg->flags & I2C_M_RD)) { + DEB2(printk("Doing the last write\n")); + ret = iic_sendbytes(i2c_adap, pmsg->buf, pmsg->len, IIC_SINGLE_XFER); + } + + return ret; +} +#endif + + +/* Whenever we initiate a transaction, the first byte clocked + * onto the bus after the start condition is the address (7 bit) of the + * device we want to talk to. This function manipulates the address specified + * so that it makes sense to the hardware when written to the IIC peripheral. + * + * Note: 10 bit addresses are not supported in this driver, although they are + * supported by the hardware. This functionality needs to be implemented. + */ +static inline int iic_doAddress(struct i2c_algo_iic_data *adap, + struct i2c_msg *msg, int retries) +{ + unsigned short flags = msg->flags; + unsigned int addr; + int ret; + +/* Ten bit addresses not supported right now */ + if ( (flags & I2C_M_TEN) ) { +#if 0 + addr = 0xf0 | (( msg->addr >> 7) & 0x03); + DEB2(printk("addr0: %d\n",addr)); + ret = try_address(adap, addr, retries); + if (ret!=1) { + printk("iic_doAddress: died at extended address code.\n"); + return -EREMOTEIO; + } + iic_outw(adap,msg->addr & 0x7f); + if (ret != 1) { + printk("iic_doAddress: died at 2nd address code.\n"); + return -EREMOTEIO; + } + if ( flags & I2C_M_RD ) { + i2c_repstart(adap); + addr |= 0x01; + ret = try_address(adap, addr, retries); + if (ret!=1) { + printk("iic_doAddress: died at extended address code.\n"); + return -EREMOTEIO; + } + } +#endif + } else { + + addr = ( msg->addr << 1 ); + +#if 0 + if (flags & I2C_M_RD ) + addr |= 1; + if (flags & I2C_M_REV_DIR_ADDR ) + addr ^= 1; +#endif + + if (iic_inw(adap, ITE_I2CSAR) != addr) { + iic_outw(adap, ITE_I2CSAR, addr); + ret = try_address(adap, addr, retries); + if (ret!=1) { + printk("iic_doAddress: died at address code.\n"); + return -EREMOTEIO; + } + } + + } + + return 0; +} + + +/* Description: Prepares the controller for a transaction (clearing status + * registers, data buffers, etc), and then calls either iic_readbytes or + * iic_sendbytes to do the actual transaction. + * + * still to be done: Before we issue a transaction, we should + * verify that the bus is not busy or in some unknown state. + */ +static int iic_xfer(struct i2c_adapter *i2c_adap, + struct i2c_msg *msgs, + int num) +{ + struct i2c_algo_iic_data *adap = i2c_adap->algo_data; + struct i2c_msg *pmsg; + int i = 0; + int ret, timeout; + + pmsg = &msgs[i]; + + if(!pmsg->len) { + DEB2(printk("iic_xfer: read/write length is 0\n");) + return -EIO; + } + if(!(pmsg->flags & I2C_M_RD) && (!(pmsg->len)%2) ) { + DEB2(printk("iic_xfer: write buffer length is not odd\n");) + return -EIO; + } + + /* Wait for any pending transfers to complete */ + timeout = wait_for_bb(adap); + if (timeout) { + DEB2(printk("iic_xfer: Timeout waiting for host not busy\n");) + return -EIO; + } + + /* Flush FIFO */ + iic_outw(adap, ITE_I2CFCR, ITE_I2CFCR_FLUSH); + + /* Load address */ + ret = iic_doAddress(adap, pmsg, i2c_adap->retries); + if (ret) + return -EIO; + +#if 0 + /* Combined transaction (read and write) */ + if(num > 1) { + DEB2(printk("iic_xfer: Call combined transaction\n")); + ret = iic_combined_transaction(i2c_adap, msgs, num); + } +#endif + + DEB3(printk("iic_xfer: Msg %d, addr=0x%x, flags=0x%x, len=%d\n", + i, msgs[i].addr, msgs[i].flags, msgs[i].len);) + + if(pmsg->flags & I2C_M_RD) /* Read */ + ret = iic_readbytes(i2c_adap, pmsg->buf, pmsg->len, 0); + else { /* Write */ + udelay(1000); + ret = iic_sendbytes(i2c_adap, pmsg->buf, pmsg->len); + } + + if (ret != pmsg->len) + DEB3(printk("iic_xfer: error or fail on read/write %d bytes.\n",ret)); + else + DEB3(printk("iic_xfer: read/write %d bytes.\n",ret)); + + return ret; +} + + +/* Implements device specific ioctls. Higher level ioctls can + * be found in i2c-core.c and are typical of any i2c controller (specifying + * slave address, timeouts, etc). These ioctls take advantage of any hardware + * features built into the controller for which this algorithm-adapter set + * was written. These ioctls allow you to take control of the data and clock + * lines and set the either high or low, + * similar to a GPIO pin. + */ +static int algo_control(struct i2c_adapter *adapter, + unsigned int cmd, unsigned long arg) +{ + + struct i2c_algo_iic_data *adap = adapter->algo_data; + struct i2c_iic_msg s_msg; + char *buf; + int ret; + + if (cmd == I2C_SREAD) { + if(copy_from_user(&s_msg, (struct i2c_iic_msg *)arg, + sizeof(struct i2c_iic_msg))) + return -EFAULT; + buf = kmalloc(s_msg.len, GFP_KERNEL); + if (buf== NULL) + return -ENOMEM; + + /* Flush FIFO */ + iic_outw(adap, ITE_I2CFCR, ITE_I2CFCR_FLUSH); + + /* Load address */ + iic_outw(adap, ITE_I2CSAR,s_msg.addr<<1); + iic_outw(adap, ITE_I2CSSAR,s_msg.waddr & 0xff); + + ret = iic_readbytes(adapter, buf, s_msg.len, 1); + if (ret>=0) { + if(copy_to_user( s_msg.buf, buf, s_msg.len) ) + ret = -EFAULT; + } + kfree(buf); + } + return 0; +} + + +static u32 iic_func(struct i2c_adapter *adap) +{ + return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR | + I2C_FUNC_PROTOCOL_MANGLING; +} + +/* -----exported algorithm data: ------------------------------------- */ + +static struct i2c_algorithm iic_algo = { + .name = "ITE IIC algorithm", + .id = I2C_ALGO_IIC, + .master_xfer = iic_xfer, + .algo_control = algo_control, /* ioctl */ + .functionality = iic_func, +}; + + +/* + * registering functions to load algorithms at runtime + */ +int i2c_iic_add_bus(struct i2c_adapter *adap) +{ + struct i2c_algo_iic_data *iic_adap = adap->algo_data; + + if (iic_test) { + int ret = test_bus(iic_adap, adap->name); + if (ret<0) + return -ENODEV; + } + + DEB2(printk("i2c-algo-ite: hw routines for %s registered.\n", + adap->name)); + + /* register new adapter to i2c module... */ + + adap->id |= iic_algo.id; + adap->algo = &iic_algo; + + adap->timeout = 100; /* default values, should */ + adap->retries = 3; /* be replaced by defines */ + adap->flags = 0; + + i2c_add_adapter(adap); + iic_init(iic_adap); + + return 0; +} + + +int i2c_iic_del_bus(struct i2c_adapter *adap) +{ + int res; + if ((res = i2c_del_adapter(adap)) < 0) + return res; + DEB2(printk("i2c-algo-ite: adapter unregistered: %s\n",adap->name)); + + return 0; +} + + +int __init i2c_algo_iic_init (void) +{ + printk(KERN_INFO "ITE iic (i2c) algorithm module\n"); + return 0; +} + + +void i2c_algo_iic_exit(void) +{ + return; +} + + +EXPORT_SYMBOL(i2c_iic_add_bus); +EXPORT_SYMBOL(i2c_iic_del_bus); + +/* The MODULE_* macros resolve to nothing if MODULES is not defined + * when this file is compiled. + */ +MODULE_AUTHOR("MontaVista Software <www.mvista.com>"); +MODULE_DESCRIPTION("ITE iic algorithm"); +MODULE_LICENSE("GPL"); + +module_param(iic_test, bool, 0); +module_param(i2c_debug, int, S_IRUGO | S_IWUSR); + +MODULE_PARM_DESC(iic_test, "Test if the I2C bus is available"); +MODULE_PARM_DESC(i2c_debug, + "debug level - 0 off; 1 normal; 2,3 more verbose; 9 iic-protocol"); + + +/* This function resolves to init_module (the function invoked when a module + * is loaded via insmod) when this file is compiled with MODULES defined. + * Otherwise (i.e. if you want this driver statically linked to the kernel), + * a pointer to this function is stored in a table and called + * during the initialization of the kernel (in do_basic_setup in /init/main.c) + * + * All this functionality is complements of the macros defined in linux/init.h + */ +module_init(i2c_algo_iic_init); + + +/* If MODULES is defined when this file is compiled, then this function will + * resolved to cleanup_module. + */ +module_exit(i2c_algo_iic_exit); |