Contributors: 19
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Linus Torvalds (pre-git) |
900 |
66.03% |
15 |
35.71% |
| Linus Torvalds |
170 |
12.47% |
2 |
4.76% |
| Eric Brower |
86 |
6.31% |
2 |
4.76% |
| David S. Miller |
60 |
4.40% |
3 |
7.14% |
| Cezar Chiru |
46 |
3.37% |
4 |
9.52% |
| Roel Kluin |
30 |
2.20% |
2 |
4.76% |
| Greg Kroah-Hartman |
25 |
1.83% |
2 |
4.76% |
| Christoph Hellwig |
12 |
0.88% |
1 |
2.38% |
| Albert Cranford |
8 |
0.59% |
1 |
2.38% |
| Peter Rosin |
7 |
0.51% |
1 |
2.38% |
| Mark M. Hoffman |
5 |
0.37% |
1 |
2.38% |
| Yumeng Fang |
3 |
0.22% |
1 |
2.38% |
| Steven Cole |
3 |
0.22% |
1 |
2.38% |
| Ian Campbell |
2 |
0.15% |
1 |
2.38% |
| Thomas Gleixner |
2 |
0.15% |
1 |
2.38% |
| Jean Delvare |
1 |
0.07% |
1 |
2.38% |
| Mickey Stein |
1 |
0.07% |
1 |
2.38% |
| Wolfram Sang |
1 |
0.07% |
1 |
2.38% |
| Uwe Kleine-König |
1 |
0.07% |
1 |
2.38% |
| Total |
1363 |
|
42 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* i2c-algo-pcf.c i2c driver algorithms for PCF8584 adapters
*
* Copyright (C) 1995-1997 Simon G. Vogl
* 1998-2000 Hans Berglund
*
* 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>
*
* Partially rewriten by Oleg I. Vdovikin <vdovikin@jscc.ru> to handle multiple
* messages, proper stop/repstart signaling during receive, added detect code
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-pcf.h>
#include <linux/string_choices.h>
#include "i2c-algo-pcf.h"
#define DEF_TIMEOUT 16
/* setting states on the bus with the right timing: */
#define set_pcf(adap, ctl, val) adap->setpcf(adap->data, ctl, val)
#define get_pcf(adap, ctl) adap->getpcf(adap->data, ctl)
#define get_own(adap) adap->getown(adap->data)
#define get_clock(adap) adap->getclock(adap->data)
#define i2c_outb(adap, val) adap->setpcf(adap->data, 0, val)
#define i2c_inb(adap) adap->getpcf(adap->data, 0)
/* other auxiliary functions */
static void i2c_start(struct i2c_algo_pcf_data *adap)
{
set_pcf(adap, 1, I2C_PCF_START);
}
static void i2c_repstart(struct i2c_algo_pcf_data *adap)
{
set_pcf(adap, 1, I2C_PCF_REPSTART);
}
static void i2c_stop(struct i2c_algo_pcf_data *adap)
{
set_pcf(adap, 1, I2C_PCF_STOP);
}
static void handle_lab(struct i2c_algo_pcf_data *adap, const int *status)
{
/*
* Cleanup from LAB -- reset and enable ESO.
* This resets the PCF8584; since we've lost the bus, no
* further attempts should be made by callers to clean up
* (no i2c_stop() etc.)
*/
set_pcf(adap, 1, I2C_PCF_PIN);
set_pcf(adap, 1, I2C_PCF_ESO);
/*
* We pause for a time period sufficient for any running
* I2C transaction to complete -- the arbitration logic won't
* work properly until the next START is seen.
* It is assumed the bus driver or client has set a proper value.
*
* REVISIT: should probably use msleep instead of mdelay if we
* know we can sleep.
*/
if (adap->lab_mdelay)
mdelay(adap->lab_mdelay);
}
static int wait_for_bb(struct i2c_algo_pcf_data *adap)
{
int timeout = DEF_TIMEOUT;
int status;
status = get_pcf(adap, 1);
while (!(status & I2C_PCF_BB) && --timeout) {
udelay(100); /* wait for 100 us */
status = get_pcf(adap, 1);
}
if (timeout == 0) {
printk(KERN_ERR "Timeout waiting for Bus Busy\n");
return -ETIMEDOUT;
}
return 0;
}
static int wait_for_pin(struct i2c_algo_pcf_data *adap, int *status)
{
int timeout = DEF_TIMEOUT;
*status = get_pcf(adap, 1);
while ((*status & I2C_PCF_PIN) && --timeout) {
adap->waitforpin(adap->data);
*status = get_pcf(adap, 1);
}
if (*status & I2C_PCF_LAB) {
handle_lab(adap, status);
return -EINTR;
}
if (timeout == 0)
return -ETIMEDOUT;
return 0;
}
/*
* This should perform the 'PCF8584 initialization sequence' as described
* in the Philips IC12 data book (1995, Aug 29).
* There should be a 30 clock cycle wait after reset, I assume this
* has been fulfilled.
* There should be a delay at the end equal to the longest I2C message
* to synchronize the BB-bit (in multimaster systems). How long is
* this? I assume 1 second is always long enough.
*
* vdovikin: added detect code for PCF8584
*/
static int pcf_init_8584(struct i2c_algo_pcf_data *adap)
{
unsigned char temp;
/* S1=0x80: S0 selected, serial interface off */
set_pcf(adap, 1, I2C_PCF_PIN);
/*
* check to see S1 now used as R/W ctrl -
* PCF8584 does that when ESO is zero
*/
temp = get_pcf(adap, 1);
if ((temp & 0x7f) != 0)
return -ENXIO; /* definitely not PCF8584 */
/* load own address in S0, effective address is (own << 1) */
i2c_outb(adap, get_own(adap));
/* check it's really written */
temp = i2c_inb(adap);
if (temp != get_own(adap))
return -ENXIO;
/* S1=0xA0, next byte in S2 */
set_pcf(adap, 1, I2C_PCF_PIN | I2C_PCF_ES1);
/* check to see S2 now selected */
temp = get_pcf(adap, 1);
if ((temp & 0x7f) != I2C_PCF_ES1)
return -ENXIO;
/* load clock register S2 */
i2c_outb(adap, get_clock(adap));
/* check it's really written, the only 5 lowest bits does matter */
temp = i2c_inb(adap);
if ((temp & 0x1f) != get_clock(adap))
return -ENXIO;
/* Enable serial interface, idle, S0 selected */
set_pcf(adap, 1, I2C_PCF_IDLE);
/* check to see PCF is really idled and we can access status register */
temp = get_pcf(adap, 1);
if (temp != (I2C_PCF_PIN | I2C_PCF_BB))
return -ENXIO;
printk(KERN_DEBUG "i2c-algo-pcf.o: detected and initialized PCF8584.\n");
return 0;
}
static int pcf_sendbytes(struct i2c_adapter *i2c_adap, const char *buf,
int count, int last)
{
struct i2c_algo_pcf_data *adap = i2c_adap->algo_data;
int wrcount, status, timeout;
for (wrcount = 0; wrcount < count; ++wrcount) {
i2c_outb(adap, buf[wrcount]);
timeout = wait_for_pin(adap, &status);
if (timeout) {
if (timeout == -EINTR)
return -EINTR; /* arbitration lost */
i2c_stop(adap);
dev_err(&i2c_adap->dev, "i2c_write: error - timeout.\n");
return -EREMOTEIO; /* got a better one ?? */
}
if (status & I2C_PCF_LRB) {
i2c_stop(adap);
dev_err(&i2c_adap->dev, "i2c_write: error - no ack.\n");
return -EREMOTEIO; /* got a better one ?? */
}
}
if (last)
i2c_stop(adap);
else
i2c_repstart(adap);
return wrcount;
}
static int pcf_readbytes(struct i2c_adapter *i2c_adap, char *buf,
int count, int last)
{
int i, status;
struct i2c_algo_pcf_data *adap = i2c_adap->algo_data;
int wfp;
/* increment number of bytes to read by one -- read dummy byte */
for (i = 0; i <= count; i++) {
wfp = wait_for_pin(adap, &status);
if (wfp) {
if (wfp == -EINTR)
return -EINTR; /* arbitration lost */
i2c_stop(adap);
dev_err(&i2c_adap->dev, "pcf_readbytes timed out.\n");
return -1;
}
if ((status & I2C_PCF_LRB) && (i != count)) {
i2c_stop(adap);
dev_err(&i2c_adap->dev, "i2c_read: i2c_inb, No ack.\n");
return -1;
}
if (i == count - 1) {
set_pcf(adap, 1, I2C_PCF_ESO);
} else if (i == count) {
if (last)
i2c_stop(adap);
else
i2c_repstart(adap);
}
if (i)
buf[i - 1] = i2c_inb(adap);
else
i2c_inb(adap); /* dummy read */
}
return i - 1;
}
static void pcf_send_address(struct i2c_algo_pcf_data *adap,
struct i2c_msg *msg)
{
unsigned char addr = i2c_8bit_addr_from_msg(msg);
if (msg->flags & I2C_M_REV_DIR_ADDR)
addr ^= 1;
i2c_outb(adap, addr);
}
static int pcf_xfer(struct i2c_adapter *i2c_adap,
struct i2c_msg *msgs,
int num)
{
struct i2c_algo_pcf_data *adap = i2c_adap->algo_data;
struct i2c_msg *pmsg;
int i;
int timeout, status;
if (adap->xfer_begin)
adap->xfer_begin(adap->data);
/* Check for bus busy */
timeout = wait_for_bb(adap);
if (timeout) {
i = -EIO;
goto out;
}
for (i = 0; i < num; i++) {
int ret;
pmsg = &msgs[i];
pcf_send_address(adap, pmsg);
/* Send START */
if (i == 0)
i2c_start(adap);
/* Wait for PIN (pending interrupt NOT) */
timeout = wait_for_pin(adap, &status);
if (timeout) {
if (timeout == -EINTR) {
/* arbitration lost */
i = -EINTR;
goto out;
}
i2c_stop(adap);
i = -EREMOTEIO;
goto out;
}
/* Check LRB (last rcvd bit - slave ack) */
if (status & I2C_PCF_LRB) {
i2c_stop(adap);
i = -EREMOTEIO;
goto out;
}
if (pmsg->flags & I2C_M_RD) {
ret = pcf_readbytes(i2c_adap, pmsg->buf, pmsg->len,
(i + 1 == num));
} else {
ret = pcf_sendbytes(i2c_adap, pmsg->buf, pmsg->len,
(i + 1 == num));
}
if (ret < 0)
goto out;
}
out:
if (adap->xfer_end)
adap->xfer_end(adap->data);
return i;
}
static u32 pcf_func(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
I2C_FUNC_PROTOCOL_MANGLING;
}
/* exported algorithm data: */
static const struct i2c_algorithm pcf_algo = {
.xfer = pcf_xfer,
.functionality = pcf_func,
};
/*
* registering functions to load algorithms at runtime
*/
int i2c_pcf_add_bus(struct i2c_adapter *adap)
{
struct i2c_algo_pcf_data *pcf_adap = adap->algo_data;
int rval;
/* register new adapter to i2c module... */
adap->algo = &pcf_algo;
rval = pcf_init_8584(pcf_adap);
if (rval)
return rval;
rval = i2c_add_adapter(adap);
return rval;
}
EXPORT_SYMBOL(i2c_pcf_add_bus);
MODULE_AUTHOR("Hans Berglund <hb@spacetec.no>");
MODULE_DESCRIPTION("I2C-Bus PCF8584 algorithm");
MODULE_LICENSE("GPL");