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Diffstat (limited to 'ANDROID_3.4.5/drivers/i2c/algos/i2c-algo-pcf.c')
-rw-r--r--ANDROID_3.4.5/drivers/i2c/algos/i2c-algo-pcf.c442
1 files changed, 0 insertions, 442 deletions
diff --git a/ANDROID_3.4.5/drivers/i2c/algos/i2c-algo-pcf.c b/ANDROID_3.4.5/drivers/i2c/algos/i2c-algo-pcf.c
deleted file mode 100644
index 5c237952..00000000
--- a/ANDROID_3.4.5/drivers/i2c/algos/i2c-algo-pcf.c
+++ /dev/null
@@ -1,442 +0,0 @@
-/*
- * i2c-algo-pcf.c i2c driver algorithms for PCF8584 adapters
- *
- * 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., 51 Franklin Street, Fifth Floor, Boston,
- * MA 02110-1301 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>
- *
- * 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/init.h>
-#include <linux/errno.h>
-#include <linux/i2c.h>
-#include <linux/i2c-algo-pcf.h>
-#include "i2c-algo-pcf.h"
-
-
-#define DEB2(x) if (i2c_debug >= 2) x
-#define DEB3(x) if (i2c_debug >= 3) x /* print several statistical values */
-#define DEBPROTO(x) if (i2c_debug >= 9) x;
- /* debug the protocol by showing transferred bits */
-#define DEF_TIMEOUT 16
-
-/*
- * module parameters:
- */
-static int i2c_debug;
-
-/* 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)
-{
- DEBPROTO(printk(KERN_DEBUG "S "));
- set_pcf(adap, 1, I2C_PCF_START);
-}
-
-static void i2c_repstart(struct i2c_algo_pcf_data *adap)
-{
- DEBPROTO(printk(" Sr "));
- set_pcf(adap, 1, I2C_PCF_REPSTART);
-}
-
-static void i2c_stop(struct i2c_algo_pcf_data *adap)
-{
- DEBPROTO(printk("P\n"));
- set_pcf(adap, 1, I2C_PCF_STOP);
-}
-
-static void handle_lab(struct i2c_algo_pcf_data *adap, const int *status)
-{
- DEB2(printk(KERN_INFO
- "i2c-algo-pcf.o: lost arbitration (CSR 0x%02x)\n",
- *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);
-
- DEB2(printk(KERN_INFO
- "i2c-algo-pcf.o: reset LAB condition (CSR 0x%02x)\n",
- get_pcf(adap, 1)));
-}
-
-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;
-
- DEB3(printk(KERN_DEBUG "i2c-algo-pcf.o: PCF state 0x%02x\n",
- get_pcf(adap, 1)));
-
- /* 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
- */
- if (((temp = get_pcf(adap, 1)) & 0x7f) != (0)) {
- DEB2(printk(KERN_ERR "i2c-algo-pcf.o: PCF detection failed -- can't select S0 (0x%02x).\n", temp));
- 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 */
- if ((temp = i2c_inb(adap)) != get_own(adap)) {
- DEB2(printk(KERN_ERR "i2c-algo-pcf.o: PCF detection failed -- can't set S0 (0x%02x).\n", temp));
- return -ENXIO;
- }
-
- /* S1=0xA0, next byte in S2 */
- set_pcf(adap, 1, I2C_PCF_PIN | I2C_PCF_ES1);
- /* check to see S2 now selected */
- if (((temp = get_pcf(adap, 1)) & 0x7f) != I2C_PCF_ES1) {
- DEB2(printk(KERN_ERR "i2c-algo-pcf.o: PCF detection failed -- can't select S2 (0x%02x).\n", temp));
- return -ENXIO;
- }
-
- /* load clock register S2 */
- i2c_outb(adap, get_clock(adap));
- /* check it's really written, the only 5 lowest bits does matter */
- if (((temp = i2c_inb(adap)) & 0x1f) != get_clock(adap)) {
- DEB2(printk(KERN_ERR "i2c-algo-pcf.o: PCF detection failed -- can't set S2 (0x%02x).\n", temp));
- 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 */
- if ((temp = get_pcf(adap, 1)) != (I2C_PCF_PIN | I2C_PCF_BB)) {
- DEB2(printk(KERN_ERR "i2c-algo-pcf.o: PCF detection failed -- can't select S1` (0x%02x).\n", temp));
- 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) {
- DEB2(dev_dbg(&i2c_adap->dev, "i2c_write: writing %2.2X\n",
- buf[wrcount] & 0xff));
- 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++) {
-
- if ((wfp = wait_for_pin(adap, &status))) {
- 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 int pcf_doAddress(struct i2c_algo_pcf_data *adap,
- struct i2c_msg *msg)
-{
- unsigned short flags = msg->flags;
- unsigned char addr;
-
- addr = msg->addr << 1;
- if (flags & I2C_M_RD)
- addr |= 1;
- if (flags & I2C_M_REV_DIR_ADDR)
- addr ^= 1;
- i2c_outb(adap, addr);
-
- return 0;
-}
-
-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 ret=0, timeout, status;
-
- if (adap->xfer_begin)
- adap->xfer_begin(adap->data);
-
- /* Check for bus busy */
- timeout = wait_for_bb(adap);
- if (timeout) {
- DEB2(printk(KERN_ERR "i2c-algo-pcf.o: "
- "Timeout waiting for BB in pcf_xfer\n");)
- i = -EIO;
- goto out;
- }
-
- for (i = 0;ret >= 0 && i < num; i++) {
- pmsg = &msgs[i];
-
- DEB2(printk(KERN_DEBUG "i2c-algo-pcf.o: Doing %s %d bytes to 0x%02x - %d of %d messages\n",
- pmsg->flags & I2C_M_RD ? "read" : "write",
- pmsg->len, pmsg->addr, i + 1, num);)
-
- ret = pcf_doAddress(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);
- DEB2(printk(KERN_ERR "i2c-algo-pcf.o: Timeout waiting "
- "for PIN(1) in pcf_xfer\n");)
- i = -EREMOTEIO;
- goto out;
- }
-
- /* Check LRB (last rcvd bit - slave ack) */
- if (status & I2C_PCF_LRB) {
- i2c_stop(adap);
- DEB2(printk(KERN_ERR "i2c-algo-pcf.o: No LRB(1) in pcf_xfer\n");)
- i = -EREMOTEIO;
- goto out;
- }
-
- DEB3(printk(KERN_DEBUG "i2c-algo-pcf.o: 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) {
- ret = pcf_readbytes(i2c_adap, pmsg->buf, pmsg->len,
- (i + 1 == num));
-
- if (ret != pmsg->len) {
- DEB2(printk(KERN_DEBUG "i2c-algo-pcf.o: fail: "
- "only read %d bytes.\n",ret));
- } else {
- DEB2(printk(KERN_DEBUG "i2c-algo-pcf.o: read %d bytes.\n",ret));
- }
- } else {
- ret = pcf_sendbytes(i2c_adap, pmsg->buf, pmsg->len,
- (i + 1 == num));
-
- if (ret != pmsg->len) {
- DEB2(printk(KERN_DEBUG "i2c-algo-pcf.o: fail: "
- "only wrote %d bytes.\n",ret));
- } else {
- DEB2(printk(KERN_DEBUG "i2c-algo-pcf.o: wrote %d bytes.\n",ret));
- }
- }
- }
-
-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 = {
- .master_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;
-
- DEB2(dev_dbg(&adap->dev, "hw routines registered.\n"));
-
- /* register new adapter to i2c module... */
- adap->algo = &pcf_algo;
-
- if ((rval = pcf_init_8584(pcf_adap)))
- 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");
-
-module_param(i2c_debug, int, S_IRUGO | S_IWUSR);
-MODULE_PARM_DESC(i2c_debug,
- "debug level - 0 off; 1 normal; 2,3 more verbose; 9 pcf-protocol");
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