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1275 |
phoenix |
/* ------------------------------------------------------------------------- */
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/* i2c-algo-pcf.c i2c driver algorithms for PCF8584 adapters */
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/* ------------------------------------------------------------------------- */
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/* Copyright (C) 1995-1997 Simon G. Vogl
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1998-2000 Hans Berglund
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* ------------------------------------------------------------------------- */
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/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and
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Frodo Looijaard <frodol@dds.nl> ,and also from Martin Bailey
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<mbailey@littlefeet-inc.com> */
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/* Partially rewriten by Oleg I. Vdovikin <vdovikin@jscc.ru> to handle multiple
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messages, proper stop/repstart signaling during receive,
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added detect code */
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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#include <linux/ioport.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/i2c.h>
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#include <linux/i2c-algo-pcf.h>
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#include "i2c-pcf8584.h"
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/* ----- global defines ----------------------------------------------- */
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#define DEB(x) if (i2c_debug>=1) x
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#define DEB2(x) if (i2c_debug>=2) x
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#define DEB3(x) if (i2c_debug>=3) x /* print several statistical values*/
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#define DEBPROTO(x) if (i2c_debug>=9) x;
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/* debug the protocol by showing transferred bits */
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#define DEF_TIMEOUT 16
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/* module parameters:
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*/
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static int i2c_debug=0;
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static int pcf_scan=0; /* have a look at what's hanging 'round */
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/* --- setting states on the bus with the right timing: --------------- */
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#define set_pcf(adap, ctl, val) adap->setpcf(adap->data, ctl, val)
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#define get_pcf(adap, ctl) adap->getpcf(adap->data, ctl)
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#define get_own(adap) adap->getown(adap->data)
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#define get_clock(adap) adap->getclock(adap->data)
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#define i2c_outb(adap, val) adap->setpcf(adap->data, 0, val)
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#define i2c_inb(adap) adap->getpcf(adap->data, 0)
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/* --- other auxiliary functions -------------------------------------- */
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static void i2c_start(struct i2c_algo_pcf_data *adap)
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{
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DEBPROTO(printk("S "));
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set_pcf(adap, 1, I2C_PCF_START);
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}
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static void i2c_repstart(struct i2c_algo_pcf_data *adap)
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{
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DEBPROTO(printk(" Sr "));
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set_pcf(adap, 1, I2C_PCF_REPSTART);
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}
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static void i2c_stop(struct i2c_algo_pcf_data *adap)
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{
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DEBPROTO(printk("P\n"));
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set_pcf(adap, 1, I2C_PCF_STOP);
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}
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static int wait_for_bb(struct i2c_algo_pcf_data *adap) {
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int timeout = DEF_TIMEOUT;
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int status;
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status = get_pcf(adap, 1);
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#ifndef STUB_I2C
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while (timeout-- && !(status & I2C_PCF_BB)) {
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udelay(100); /* wait for 100 us */
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status = get_pcf(adap, 1);
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}
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#endif
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if (timeout <= 0) {
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printk(KERN_ERR "Timeout waiting for Bus Busy\n");
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}
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return (timeout<=0);
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}
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static inline void pcf_sleep(unsigned long timeout)
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{
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schedule_timeout( timeout * HZ);
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}
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static int wait_for_pin(struct i2c_algo_pcf_data *adap, int *status) {
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int timeout = DEF_TIMEOUT;
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*status = get_pcf(adap, 1);
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#ifndef STUB_I2C
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while (timeout-- && (*status & I2C_PCF_PIN)) {
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adap->waitforpin();
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*status = get_pcf(adap, 1);
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}
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#endif
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if (timeout <= 0)
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return(-1);
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else
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return(0);
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}
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/*
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* This should perform the 'PCF8584 initialization sequence' as described
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* in the Philips IC12 data book (1995, Aug 29).
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* There should be a 30 clock cycle wait after reset, I assume this
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* has been fulfilled.
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* There should be a delay at the end equal to the longest I2C message
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* to synchronize the BB-bit (in multimaster systems). How long is
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* this? I assume 1 second is always long enough.
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*
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* vdovikin: added detect code for PCF8584
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*/
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static int pcf_init_8584 (struct i2c_algo_pcf_data *adap)
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{
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unsigned char temp;
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DEB3(printk(KERN_DEBUG "i2c-algo-pcf.o: PCF state 0x%02x\n", get_pcf(adap, 1)));
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/* S1=0x80: S0 selected, serial interface off */
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set_pcf(adap, 1, I2C_PCF_PIN);
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/* check to see S1 now used as R/W ctrl -
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PCF8584 does that when ESO is zero */
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/* PCF also resets PIN bit */
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if ((temp = get_pcf(adap, 1)) != (0)) {
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DEB2(printk(KERN_ERR "i2c-algo-pcf.o: PCF detection failed -- can't select S0 (0x%02x).\n", temp));
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return -ENXIO; /* definetly not PCF8584 */
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}
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/* load own address in S0, effective address is (own << 1) */
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i2c_outb(adap, get_own(adap));
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/* check it's realy writen */
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if ((temp = i2c_inb(adap)) != get_own(adap)) {
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DEB2(printk(KERN_ERR "i2c-algo-pcf.o: PCF detection failed -- can't set S0 (0x%02x).\n", temp));
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return -ENXIO;
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}
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/* S1=0xA0, next byte in S2 */
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set_pcf(adap, 1, I2C_PCF_PIN | I2C_PCF_ES1);
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/* check to see S2 now selected */
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if ((temp = get_pcf(adap, 1)) != I2C_PCF_ES1) {
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DEB2(printk(KERN_ERR "i2c-algo-pcf.o: PCF detection failed -- can't select S2 (0x%02x).\n", temp));
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return -ENXIO;
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}
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/* load clock register S2 */
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i2c_outb(adap, get_clock(adap));
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/* check it's realy writen, the only 5 lowest bits does matter */
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if (((temp = i2c_inb(adap)) & 0x1f) != get_clock(adap)) {
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DEB2(printk(KERN_ERR "i2c-algo-pcf.o: PCF detection failed -- can't set S2 (0x%02x).\n", temp));
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return -ENXIO;
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}
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/* Enable serial interface, idle, S0 selected */
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set_pcf(adap, 1, I2C_PCF_IDLE);
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/* check to see PCF is realy idled and we can access status register */
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if ((temp = get_pcf(adap, 1)) != (I2C_PCF_PIN | I2C_PCF_BB)) {
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DEB2(printk(KERN_ERR "i2c-algo-pcf.o: PCF detection failed -- can't select S1` (0x%02x).\n", temp));
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return -ENXIO;
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}
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printk(KERN_DEBUG "i2c-algo-pcf.o: deteted and initialized PCF8584.\n");
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return 0;
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}
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/* ----- Utility functions
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*/
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static inline int try_address(struct i2c_algo_pcf_data *adap,
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unsigned char addr, int retries)
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{
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int i, status, ret = -1;
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for (i=0;i<retries;i++) {
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i2c_outb(adap, addr);
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i2c_start(adap);
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status = get_pcf(adap, 1);
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if (wait_for_pin(adap, &status) >= 0) {
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if ((status & I2C_PCF_LRB) == 0) {
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i2c_stop(adap);
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break; /* success! */
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}
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}
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i2c_stop(adap);
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udelay(adap->udelay);
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}
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DEB2(if (i) printk(KERN_DEBUG "i2c-algo-pcf.o: needed %d retries for %d\n",i,
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addr));
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return ret;
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}
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| 222 |
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| 223 |
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static int pcf_sendbytes(struct i2c_adapter *i2c_adap, const char *buf,
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int count, int last)
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{
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| 226 |
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struct i2c_algo_pcf_data *adap = i2c_adap->algo_data;
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int wrcount, status, timeout;
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| 229 |
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for (wrcount=0; wrcount<count; ++wrcount) {
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DEB2(printk(KERN_DEBUG "i2c-algo-pcf.o: %s i2c_write: writing %2.2X\n",
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i2c_adap->name, buf[wrcount]&0xff));
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i2c_outb(adap, buf[wrcount]);
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timeout = wait_for_pin(adap, &status);
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if (timeout) {
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i2c_stop(adap);
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printk(KERN_ERR "i2c-algo-pcf.o: %s i2c_write: "
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"error - timeout.\n", i2c_adap->name);
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return -EREMOTEIO; /* got a better one ?? */
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| 239 |
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}
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| 240 |
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#ifndef STUB_I2C
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| 241 |
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if (status & I2C_PCF_LRB) {
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| 242 |
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i2c_stop(adap);
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| 243 |
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printk(KERN_ERR "i2c-algo-pcf.o: %s i2c_write: "
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| 244 |
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"error - no ack.\n", i2c_adap->name);
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return -EREMOTEIO; /* got a better one ?? */
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| 246 |
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}
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| 247 |
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#endif
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| 248 |
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}
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| 249 |
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if (last) {
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i2c_stop(adap);
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| 251 |
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}
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| 252 |
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else {
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| 253 |
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i2c_repstart(adap);
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| 254 |
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}
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| 255 |
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| 256 |
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return (wrcount);
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| 257 |
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}
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| 258 |
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| 259 |
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| 260 |
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static int pcf_readbytes(struct i2c_adapter *i2c_adap, char *buf,
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int count, int last)
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| 262 |
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{
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| 263 |
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int i, status;
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| 264 |
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struct i2c_algo_pcf_data *adap = i2c_adap->algo_data;
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| 265 |
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| 266 |
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/* increment number of bytes to read by one -- read dummy byte */
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| 267 |
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for (i = 0; i <= count; i++) {
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| 268 |
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| 269 |
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if (wait_for_pin(adap, &status)) {
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| 270 |
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i2c_stop(adap);
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| 271 |
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printk(KERN_ERR "i2c-algo-pcf.o: pcf_readbytes timed out.\n");
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| 272 |
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return (-1);
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| 273 |
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}
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| 274 |
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| 275 |
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#ifndef STUB_I2C
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| 276 |
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if ((status & I2C_PCF_LRB) && (i != count)) {
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| 277 |
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i2c_stop(adap);
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| 278 |
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printk(KERN_ERR "i2c-algo-pcf.o: i2c_read: i2c_inb, No ack.\n");
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| 279 |
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return (-1);
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| 280 |
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}
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| 281 |
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#endif
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| 282 |
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| 283 |
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if (i == count - 1) {
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| 284 |
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set_pcf(adap, 1, I2C_PCF_ESO);
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| 285 |
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} else
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| 286 |
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if (i == count) {
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| 287 |
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if (last) {
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| 288 |
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i2c_stop(adap);
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| 289 |
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} else {
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| 290 |
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i2c_repstart(adap);
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| 291 |
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}
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| 292 |
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};
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| 293 |
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| 294 |
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if (i) {
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| 295 |
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buf[i - 1] = i2c_inb(adap);
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| 296 |
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} else {
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| 297 |
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i2c_inb(adap); /* dummy read */
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| 298 |
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}
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| 299 |
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}
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| 300 |
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| 301 |
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return (i - 1);
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| 302 |
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}
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| 303 |
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| 304 |
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| 305 |
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static inline int pcf_doAddress(struct i2c_algo_pcf_data *adap,
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| 306 |
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struct i2c_msg *msg, int retries)
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| 307 |
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{
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| 308 |
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unsigned short flags = msg->flags;
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| 309 |
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unsigned char addr;
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| 310 |
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int ret;
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| 311 |
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if ( (flags & I2C_M_TEN) ) {
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| 312 |
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/* a ten bit address */
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| 313 |
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addr = 0xf0 | (( msg->addr >> 7) & 0x03);
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| 314 |
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DEB2(printk(KERN_DEBUG "addr0: %d\n",addr));
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| 315 |
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/* try extended address code...*/
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| 316 |
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ret = try_address(adap, addr, retries);
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| 317 |
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if (ret!=1) {
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| 318 |
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printk(KERN_ERR "died at extended address code.\n");
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| 319 |
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return -EREMOTEIO;
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| 320 |
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}
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| 321 |
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/* the remaining 8 bit address */
|
| 322 |
|
|
i2c_outb(adap,msg->addr & 0x7f);
|
| 323 |
|
|
/* Status check comes here */
|
| 324 |
|
|
if (ret != 1) {
|
| 325 |
|
|
printk(KERN_ERR "died at 2nd address code.\n");
|
| 326 |
|
|
return -EREMOTEIO;
|
| 327 |
|
|
}
|
| 328 |
|
|
if ( flags & I2C_M_RD ) {
|
| 329 |
|
|
i2c_repstart(adap);
|
| 330 |
|
|
/* okay, now switch into reading mode */
|
| 331 |
|
|
addr |= 0x01;
|
| 332 |
|
|
ret = try_address(adap, addr, retries);
|
| 333 |
|
|
if (ret!=1) {
|
| 334 |
|
|
printk(KERN_ERR "died at extended address code.\n");
|
| 335 |
|
|
return -EREMOTEIO;
|
| 336 |
|
|
}
|
| 337 |
|
|
}
|
| 338 |
|
|
} else { /* normal 7bit address */
|
| 339 |
|
|
addr = ( msg->addr << 1 );
|
| 340 |
|
|
if (flags & I2C_M_RD )
|
| 341 |
|
|
addr |= 1;
|
| 342 |
|
|
if (flags & I2C_M_REV_DIR_ADDR )
|
| 343 |
|
|
addr ^= 1;
|
| 344 |
|
|
i2c_outb(adap, addr);
|
| 345 |
|
|
}
|
| 346 |
|
|
return 0;
|
| 347 |
|
|
}
|
| 348 |
|
|
|
| 349 |
|
|
static int pcf_xfer(struct i2c_adapter *i2c_adap,
|
| 350 |
|
|
struct i2c_msg msgs[],
|
| 351 |
|
|
int num)
|
| 352 |
|
|
{
|
| 353 |
|
|
struct i2c_algo_pcf_data *adap = i2c_adap->algo_data;
|
| 354 |
|
|
struct i2c_msg *pmsg;
|
| 355 |
|
|
int i;
|
| 356 |
|
|
int ret=0, timeout, status;
|
| 357 |
|
|
|
| 358 |
|
|
|
| 359 |
|
|
/* Check for bus busy */
|
| 360 |
|
|
timeout = wait_for_bb(adap);
|
| 361 |
|
|
if (timeout) {
|
| 362 |
|
|
DEB2(printk(KERN_ERR "i2c-algo-pcf.o: "
|
| 363 |
|
|
"Timeout waiting for BB in pcf_xfer\n");)
|
| 364 |
|
|
return -EIO;
|
| 365 |
|
|
}
|
| 366 |
|
|
|
| 367 |
|
|
for (i = 0;ret >= 0 && i < num; i++) {
|
| 368 |
|
|
pmsg = &msgs[i];
|
| 369 |
|
|
|
| 370 |
|
|
DEB2(printk(KERN_DEBUG "i2c-algo-pcf.o: Doing %s %d bytes to 0x%02x - %d of %d messages\n",
|
| 371 |
|
|
pmsg->flags & I2C_M_RD ? "read" : "write",
|
| 372 |
|
|
pmsg->len, pmsg->addr, i + 1, num);)
|
| 373 |
|
|
|
| 374 |
|
|
ret = pcf_doAddress(adap, pmsg, i2c_adap->retries);
|
| 375 |
|
|
|
| 376 |
|
|
/* Send START */
|
| 377 |
|
|
if (i == 0) {
|
| 378 |
|
|
i2c_start(adap);
|
| 379 |
|
|
}
|
| 380 |
|
|
|
| 381 |
|
|
/* Wait for PIN (pending interrupt NOT) */
|
| 382 |
|
|
timeout = wait_for_pin(adap, &status);
|
| 383 |
|
|
if (timeout) {
|
| 384 |
|
|
i2c_stop(adap);
|
| 385 |
|
|
DEB2(printk(KERN_ERR "i2c-algo-pcf.o: Timeout waiting "
|
| 386 |
|
|
"for PIN(1) in pcf_xfer\n");)
|
| 387 |
|
|
return (-EREMOTEIO);
|
| 388 |
|
|
}
|
| 389 |
|
|
|
| 390 |
|
|
#ifndef STUB_I2C
|
| 391 |
|
|
/* Check LRB (last rcvd bit - slave ack) */
|
| 392 |
|
|
if (status & I2C_PCF_LRB) {
|
| 393 |
|
|
i2c_stop(adap);
|
| 394 |
|
|
DEB2(printk(KERN_ERR "i2c-algo-pcf.o: No LRB(1) in pcf_xfer\n");)
|
| 395 |
|
|
return (-EREMOTEIO);
|
| 396 |
|
|
}
|
| 397 |
|
|
#endif
|
| 398 |
|
|
|
| 399 |
|
|
DEB3(printk(KERN_DEBUG "i2c-algo-pcf.o: Msg %d, addr=0x%x, flags=0x%x, len=%d\n",
|
| 400 |
|
|
i, msgs[i].addr, msgs[i].flags, msgs[i].len);)
|
| 401 |
|
|
|
| 402 |
|
|
/* Read */
|
| 403 |
|
|
if (pmsg->flags & I2C_M_RD) {
|
| 404 |
|
|
/* read bytes into buffer*/
|
| 405 |
|
|
ret = pcf_readbytes(i2c_adap, pmsg->buf, pmsg->len,
|
| 406 |
|
|
(i + 1 == num));
|
| 407 |
|
|
|
| 408 |
|
|
if (ret != pmsg->len) {
|
| 409 |
|
|
DEB2(printk(KERN_DEBUG "i2c-algo-pcf.o: fail: "
|
| 410 |
|
|
"only read %d bytes.\n",ret));
|
| 411 |
|
|
} else {
|
| 412 |
|
|
DEB2(printk(KERN_DEBUG "i2c-algo-pcf.o: read %d bytes.\n",ret));
|
| 413 |
|
|
}
|
| 414 |
|
|
} else { /* Write */
|
| 415 |
|
|
ret = pcf_sendbytes(i2c_adap, pmsg->buf, pmsg->len,
|
| 416 |
|
|
(i + 1 == num));
|
| 417 |
|
|
|
| 418 |
|
|
if (ret != pmsg->len) {
|
| 419 |
|
|
DEB2(printk(KERN_DEBUG "i2c-algo-pcf.o: fail: "
|
| 420 |
|
|
"only wrote %d bytes.\n",ret));
|
| 421 |
|
|
} else {
|
| 422 |
|
|
DEB2(printk(KERN_DEBUG "i2c-algo-pcf.o: wrote %d bytes.\n",ret));
|
| 423 |
|
|
}
|
| 424 |
|
|
}
|
| 425 |
|
|
}
|
| 426 |
|
|
|
| 427 |
|
|
return (i);
|
| 428 |
|
|
}
|
| 429 |
|
|
|
| 430 |
|
|
static int algo_control(struct i2c_adapter *adapter,
|
| 431 |
|
|
unsigned int cmd, unsigned long arg)
|
| 432 |
|
|
{
|
| 433 |
|
|
return 0;
|
| 434 |
|
|
}
|
| 435 |
|
|
|
| 436 |
|
|
static u32 pcf_func(struct i2c_adapter *adap)
|
| 437 |
|
|
{
|
| 438 |
|
|
return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR |
|
| 439 |
|
|
I2C_FUNC_PROTOCOL_MANGLING;
|
| 440 |
|
|
}
|
| 441 |
|
|
|
| 442 |
|
|
/* -----exported algorithm data: ------------------------------------- */
|
| 443 |
|
|
|
| 444 |
|
|
static struct i2c_algorithm pcf_algo = {
|
| 445 |
|
|
"PCF8584 algorithm",
|
| 446 |
|
|
I2C_ALGO_PCF,
|
| 447 |
|
|
pcf_xfer,
|
| 448 |
|
|
NULL,
|
| 449 |
|
|
NULL, /* slave_xmit */
|
| 450 |
|
|
NULL, /* slave_recv */
|
| 451 |
|
|
algo_control, /* ioctl */
|
| 452 |
|
|
pcf_func, /* functionality */
|
| 453 |
|
|
};
|
| 454 |
|
|
|
| 455 |
|
|
/*
|
| 456 |
|
|
* registering functions to load algorithms at runtime
|
| 457 |
|
|
*/
|
| 458 |
|
|
int i2c_pcf_add_bus(struct i2c_adapter *adap)
|
| 459 |
|
|
{
|
| 460 |
|
|
int i, status;
|
| 461 |
|
|
struct i2c_algo_pcf_data *pcf_adap = adap->algo_data;
|
| 462 |
|
|
|
| 463 |
|
|
DEB2(printk(KERN_DEBUG "i2c-algo-pcf.o: hw routines for %s registered.\n",
|
| 464 |
|
|
adap->name));
|
| 465 |
|
|
|
| 466 |
|
|
/* register new adapter to i2c module... */
|
| 467 |
|
|
|
| 468 |
|
|
adap->id |= pcf_algo.id;
|
| 469 |
|
|
adap->algo = &pcf_algo;
|
| 470 |
|
|
|
| 471 |
|
|
adap->timeout = 100; /* default values, should */
|
| 472 |
|
|
adap->retries = 3; /* be replaced by defines */
|
| 473 |
|
|
|
| 474 |
|
|
if ((i = pcf_init_8584(pcf_adap))) {
|
| 475 |
|
|
return i;
|
| 476 |
|
|
}
|
| 477 |
|
|
|
| 478 |
|
|
#ifdef MODULE
|
| 479 |
|
|
MOD_INC_USE_COUNT;
|
| 480 |
|
|
#endif
|
| 481 |
|
|
|
| 482 |
|
|
i2c_add_adapter(adap);
|
| 483 |
|
|
|
| 484 |
|
|
/* scan bus */
|
| 485 |
|
|
if (pcf_scan) {
|
| 486 |
|
|
printk(KERN_INFO " i2c-algo-pcf.o: scanning bus %s.\n",
|
| 487 |
|
|
adap->name);
|
| 488 |
|
|
for (i = 0x00; i < 0xff; i+=2) {
|
| 489 |
|
|
if (wait_for_bb(pcf_adap)) {
|
| 490 |
|
|
printk(KERN_INFO " i2c-algo-pcf.o: scanning bus %s - TIMEOUTed.\n",
|
| 491 |
|
|
adap->name);
|
| 492 |
|
|
break;
|
| 493 |
|
|
}
|
| 494 |
|
|
i2c_outb(pcf_adap, i);
|
| 495 |
|
|
i2c_start(pcf_adap);
|
| 496 |
|
|
if ((wait_for_pin(pcf_adap, &status) >= 0) &&
|
| 497 |
|
|
((status & I2C_PCF_LRB) == 0)) {
|
| 498 |
|
|
printk("(%02x)",i>>1);
|
| 499 |
|
|
} else {
|
| 500 |
|
|
printk(".");
|
| 501 |
|
|
}
|
| 502 |
|
|
i2c_stop(pcf_adap);
|
| 503 |
|
|
udelay(pcf_adap->udelay);
|
| 504 |
|
|
}
|
| 505 |
|
|
printk("\n");
|
| 506 |
|
|
}
|
| 507 |
|
|
return 0;
|
| 508 |
|
|
}
|
| 509 |
|
|
|
| 510 |
|
|
|
| 511 |
|
|
int i2c_pcf_del_bus(struct i2c_adapter *adap)
|
| 512 |
|
|
{
|
| 513 |
|
|
int res;
|
| 514 |
|
|
if ((res = i2c_del_adapter(adap)) < 0)
|
| 515 |
|
|
return res;
|
| 516 |
|
|
DEB2(printk("i2c-algo-pcf.o: adapter unregistered: %s\n",adap->name));
|
| 517 |
|
|
|
| 518 |
|
|
#ifdef MODULE
|
| 519 |
|
|
MOD_DEC_USE_COUNT;
|
| 520 |
|
|
#endif
|
| 521 |
|
|
return 0;
|
| 522 |
|
|
}
|
| 523 |
|
|
|
| 524 |
|
|
int __init i2c_algo_pcf_init (void)
|
| 525 |
|
|
{
|
| 526 |
|
|
printk("i2c-algo-pcf.o: i2c pcf8584 algorithm module\n");
|
| 527 |
|
|
return 0;
|
| 528 |
|
|
}
|
| 529 |
|
|
|
| 530 |
|
|
|
| 531 |
|
|
EXPORT_SYMBOL(i2c_pcf_add_bus);
|
| 532 |
|
|
EXPORT_SYMBOL(i2c_pcf_del_bus);
|
| 533 |
|
|
|
| 534 |
|
|
#ifdef MODULE
|
| 535 |
|
|
MODULE_AUTHOR("Hans Berglund <hb@spacetec.no>");
|
| 536 |
|
|
MODULE_DESCRIPTION("I2C-Bus PCF8584 algorithm");
|
| 537 |
|
|
MODULE_LICENSE("GPL");
|
| 538 |
|
|
|
| 539 |
|
|
MODULE_PARM(pcf_scan, "i");
|
| 540 |
|
|
MODULE_PARM(i2c_debug,"i");
|
| 541 |
|
|
|
| 542 |
|
|
MODULE_PARM_DESC(pcf_scan, "Scan for active chips on the bus");
|
| 543 |
|
|
MODULE_PARM_DESC(i2c_debug,
|
| 544 |
|
|
"debug level - 0 off; 1 normal; 2,3 more verbose; 9 pcf-protocol");
|
| 545 |
|
|
|
| 546 |
|
|
|
| 547 |
|
|
int init_module(void)
|
| 548 |
|
|
{
|
| 549 |
|
|
return i2c_algo_pcf_init();
|
| 550 |
|
|
}
|
| 551 |
|
|
|
| 552 |
|
|
void cleanup_module(void)
|
| 553 |
|
|
{
|
| 554 |
|
|
}
|
| 555 |
|
|
#endif
|
