2003-11-14 17:48:57 +01:00
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/*
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* Copyright (C) 1998 Itai Nahshon, Michael Schimek
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*
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* The original code was derived from and inspired by
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* the I2C driver from the Linux kernel.
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* (c) 1998 Gerd Knorr <kraxel@cs.tu-berlin.de>
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*/
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2005-07-03 09:02:09 +02:00
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#ifdef HAVE_XORG_CONFIG_H
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#include <xorg-config.h>
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#endif
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2006-02-10 23:00:30 +01:00
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#include <sys/time.h>
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#include <string.h>
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2005-07-03 10:53:54 +02:00
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#include "misc.h"
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2003-11-14 17:48:57 +01:00
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#include "xf86.h"
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#include "xf86_OSproc.h"
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2005-04-20 14:25:48 +02:00
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#include <X11/X.h>
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2006-02-10 23:00:30 +01:00
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#include <X11/Xos.h>
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2005-04-20 14:25:48 +02:00
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#include <X11/Xproto.h>
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2003-11-14 17:48:57 +01:00
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#include "scrnintstr.h"
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#include "regionstr.h"
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#include "windowstr.h"
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#include "pixmapstr.h"
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#include "validate.h"
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#include "resource.h"
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#include "gcstruct.h"
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#include "dixstruct.h"
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#include "xf86i2c.h"
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#define I2C_TIMEOUT(x) /*(x)*/ /* Report timeouts */
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#define I2C_TRACE(x) /*(x)*/ /* Report progress */
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/* This is the default I2CUDelay function if not supplied by the driver.
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* High level I2C interfaces implementing the bus protocol in hardware
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* should supply this function too.
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*
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* Delay execution at least usec microseconds.
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* All values 0 to 1e6 inclusive must be expected.
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*/
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static void
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I2CUDelay(I2CBusPtr b, int usec)
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{
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2006-02-10 23:00:30 +01:00
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struct timeval begin, cur;
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2003-11-14 17:48:57 +01:00
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long d_secs, d_usecs;
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long diff;
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if (usec > 0) {
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2006-02-10 23:00:30 +01:00
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X_GETTIMEOFDAY(&begin);
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2003-11-14 17:48:57 +01:00
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do {
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/* It would be nice to use {xf86}usleep,
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* but usleep (1) takes >10000 usec !
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*/
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2006-02-10 23:00:30 +01:00
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X_GETTIMEOFDAY(&cur);
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d_secs = (cur.tv_sec - begin.tv_sec);
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d_usecs = (cur.tv_usec - begin.tv_usec);
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2003-11-14 17:48:57 +01:00
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diff = d_secs*1000000 + d_usecs;
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2005-01-24 21:44:49 +01:00
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} while (diff>=0 && diff< (usec + 1));
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2003-11-14 17:48:57 +01:00
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}
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}
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/* Most drivers will register just with GetBits/PutBits functions.
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* The following functions implement a software I2C protocol
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* by using the promitive functions given by the driver.
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* ================================================================
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*
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* It is assumed that there is just one master on the I2C bus, therefore
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* there is no explicit test for conflits.
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*/
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#define RISEFALLTIME 2 /* usec, actually 300 to 1000 ns according to the i2c specs */
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/* Some devices will hold SCL low to slow down the bus or until
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* ready for transmission.
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*
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* This condition will be noticed when the master tries to raise
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* the SCL line. You can set the timeout to zero if the slave device
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* does not support this clock synchronization.
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*/
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static Bool
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I2CRaiseSCL(I2CBusPtr b, int sda, int timeout)
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{
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int i, scl;
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b->I2CPutBits(b, 1, sda);
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b->I2CUDelay(b, b->RiseFallTime);
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for (i = timeout; i > 0; i -= b->RiseFallTime) {
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b->I2CGetBits(b, &scl, &sda);
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if (scl) break;
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b->I2CUDelay(b, b->RiseFallTime);
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}
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if (i <= 0) {
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I2C_TIMEOUT(ErrorF("[I2CRaiseSCL(<%s>, %d, %d) timeout]", b->BusName, sda, timeout));
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return FALSE;
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}
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return TRUE;
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}
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/* Send a start signal on the I2C bus. The start signal notifies
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* devices that a new transaction is initiated by the bus master.
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*
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* The start signal is always followed by a slave address.
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* Slave addresses are 8+ bits. The first 7 bits identify the
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* device and the last bit signals if this is a read (1) or
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* write (0) operation.
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*
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* There may be more than one start signal on one transaction.
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* This happens for example on some devices that allow reading
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* of registers. First send a start bit followed by the device
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* address (with the last bit 0) and the register number. Then send
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* a new start bit with the device address (with the last bit 1)
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* and then read the value from the device.
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*
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* Note this is function does not implement a multiple master
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* arbitration procedure.
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*/
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static Bool
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I2CStart(I2CBusPtr b, int timeout)
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{
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if (!I2CRaiseSCL(b, 1, timeout))
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return FALSE;
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b->I2CPutBits(b, 1, 0);
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b->I2CUDelay(b, b->HoldTime);
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b->I2CPutBits(b, 0, 0);
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b->I2CUDelay(b, b->HoldTime);
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I2C_TRACE(ErrorF("\ni2c: <"));
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return TRUE;
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}
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/* This is the default I2CStop function if not supplied by the driver.
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*
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* Signal devices on the I2C bus that a transaction on the
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* bus has finished. There may be more than one start signal
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* on a transaction but only one stop signal.
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*/
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static void
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I2CStop(I2CDevPtr d)
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{
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I2CBusPtr b = d->pI2CBus;
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b->I2CPutBits(b, 0, 0);
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b->I2CUDelay(b, b->RiseFallTime);
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b->I2CPutBits(b, 1, 0);
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b->I2CUDelay(b, b->HoldTime);
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b->I2CPutBits(b, 1, 1);
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b->I2CUDelay(b, b->HoldTime);
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I2C_TRACE(ErrorF(">\n"));
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}
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/* Write/Read a single bit to/from a device.
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* Return FALSE if a timeout occurs.
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*/
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static Bool
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I2CWriteBit(I2CBusPtr b, int sda, int timeout)
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{
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Bool r;
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b->I2CPutBits(b, 0, sda);
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b->I2CUDelay(b, b->RiseFallTime);
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r = I2CRaiseSCL(b, sda, timeout);
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b->I2CUDelay(b, b->HoldTime);
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b->I2CPutBits(b, 0, sda);
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b->I2CUDelay(b, b->HoldTime);
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return r;
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}
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static Bool
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I2CReadBit(I2CBusPtr b, int *psda, int timeout)
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{
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Bool r;
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int scl;
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r = I2CRaiseSCL(b, 1, timeout);
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b->I2CUDelay(b, b->HoldTime);
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b->I2CGetBits(b, &scl, psda);
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b->I2CPutBits(b, 0, 1);
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b->I2CUDelay(b, b->HoldTime);
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return r;
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}
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/* This is the default I2CPutByte function if not supplied by the driver.
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*
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* A single byte is sent to the device.
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* The function returns FALSE if a timeout occurs, you should send
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* a stop condition afterwards to reset the bus.
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*
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* A timeout occurs,
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* if the slave pulls SCL to slow down the bus more than ByteTimeout usecs,
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* or slows down the bus for more than BitTimeout usecs for each bit,
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* or does not send an ACK bit (0) to acknowledge the transmission within
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* AcknTimeout usecs, but a NACK (1) bit.
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*
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* AcknTimeout must be at least b->HoldTime, the other timeouts can be
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* zero according to the comment on I2CRaiseSCL.
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*/
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static Bool
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I2CPutByte(I2CDevPtr d, I2CByte data)
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{
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Bool r;
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int i, scl, sda;
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I2CBusPtr b = d->pI2CBus;
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if (!I2CWriteBit(b, (data >> 7) & 1, d->ByteTimeout))
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return FALSE;
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for (i = 6; i >= 0; i--)
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if (!I2CWriteBit(b, (data >> i) & 1, d->BitTimeout))
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return FALSE;
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b->I2CPutBits(b, 0, 1);
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b->I2CUDelay(b, b->RiseFallTime);
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r = I2CRaiseSCL(b, 1, b->HoldTime);
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if (r) {
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for (i = d->AcknTimeout; i > 0; i -= b->HoldTime) {
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b->I2CUDelay(b, b->HoldTime);
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b->I2CGetBits(b, &scl, &sda);
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if (sda == 0) break;
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}
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if (i <= 0) {
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I2C_TIMEOUT(ErrorF("[I2CPutByte(<%s>, 0x%02x, %d, %d, %d) timeout]",
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b->BusName, data, d->BitTimeout,
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d->ByteTimeout, d->AcknTimeout));
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r = FALSE;
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}
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I2C_TRACE(ErrorF("W%02x%c ", (int) data, sda ? '-' : '+'));
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}
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b->I2CPutBits(b, 0, 1);
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b->I2CUDelay(b, b->HoldTime);
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return r;
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}
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/* This is the default I2CGetByte function if not supplied by the driver.
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*
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* A single byte is read from the device.
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* The function returns FALSE if a timeout occurs, you should send
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* a stop condition afterwards to reset the bus.
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*
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* A timeout occurs,
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* if the slave pulls SCL to slow down the bus more than ByteTimeout usecs,
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* or slows down the bus for more than b->BitTimeout usecs for each bit.
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*
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* ByteTimeout must be at least b->HoldTime, the other timeouts can be
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* zero according to the comment on I2CRaiseSCL.
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*
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* For the <last> byte in a sequence the acknowledge bit NACK (1),
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* otherwise ACK (0) will be sent.
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*/
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static Bool
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I2CGetByte(I2CDevPtr d, I2CByte *data, Bool last)
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{
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int i, sda;
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I2CBusPtr b = d->pI2CBus;
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b->I2CPutBits(b, 0, 1);
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b->I2CUDelay(b, b->RiseFallTime);
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if (!I2CReadBit(b, &sda, d->ByteTimeout))
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return FALSE;
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*data = (sda > 0) << 7;
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for (i = 6; i >= 0; i--)
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if (!I2CReadBit(b, &sda, d->BitTimeout))
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return FALSE;
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else
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*data |= (sda > 0) << i;
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if (!I2CWriteBit(b, last ? 1 : 0, d->BitTimeout))
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return FALSE;
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I2C_TRACE(ErrorF("R%02x%c ", (int) *data, last ? '+' : '-'));
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return TRUE;
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}
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/* This is the default I2CAddress function if not supplied by the driver.
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*
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* It creates the start condition, followed by the d->SlaveAddr.
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* Higher level functions must call this routine rather than
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* I2CStart/PutByte because a hardware I2C master may not be able
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* to send a slave address without a start condition.
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*
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* The same timeouts apply as with I2CPutByte and additional a
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* StartTimeout, similar to the ByteTimeout but for the start
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* condition.
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*
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* In case of a timeout, the bus is left in a clean idle condition.
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* I. e. you *must not* send a Stop. If this function succeeds, you *must*.
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*
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* The slave address format is 16 bit, with the legacy _8_bit_ slave address
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* in the least significant byte. This is, the slave address must include the
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* R/_W flag as least significant bit.
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*
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* The most significant byte of the address will be sent _after_ the LSB,
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* but only if the LSB indicates:
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* a) an 11 bit address, this is LSB = 1111 0xxx.
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* b) a 'general call address', this is LSB = 0000 000x - see the I2C specs
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* for more.
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*/
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static Bool
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I2CAddress(I2CDevPtr d, I2CSlaveAddr addr)
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{
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if (I2CStart(d->pI2CBus, d->StartTimeout)) {
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if (I2CPutByte(d, addr & 0xFF)) {
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if ((addr & 0xF8) != 0xF0 &&
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(addr & 0xFE) != 0x00)
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return TRUE;
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if (I2CPutByte(d, (addr >> 8) & 0xFF))
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return TRUE;
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}
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I2CStop(d);
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}
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return FALSE;
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}
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/* These are the hardware independent I2C helper functions.
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* ========================================================
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*/
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/* Function for probing. Just send the slave address
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* and return true if the device responds. The slave address
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* must have the lsb set to reflect a read (1) or write (0) access.
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* Don't expect a read- or write-only device will respond otherwise.
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*/
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2008-11-27 03:12:59 +01:00
|
|
|
_X_EXPORT Bool
|
2003-11-14 17:48:57 +01:00
|
|
|
xf86I2CProbeAddress(I2CBusPtr b, I2CSlaveAddr addr)
|
|
|
|
{
|
|
|
|
int r;
|
|
|
|
I2CDevRec d;
|
|
|
|
|
|
|
|
d.DevName = "Probing";
|
|
|
|
d.BitTimeout = b->BitTimeout;
|
|
|
|
d.ByteTimeout = b->ByteTimeout;
|
|
|
|
d.AcknTimeout = b->AcknTimeout;
|
|
|
|
d.StartTimeout = b->StartTimeout;
|
|
|
|
d.SlaveAddr = addr;
|
|
|
|
d.pI2CBus = b;
|
|
|
|
d.NextDev = NULL;
|
|
|
|
|
|
|
|
r = b->I2CAddress(&d, addr);
|
|
|
|
|
|
|
|
if (r) b->I2CStop(&d);
|
|
|
|
|
|
|
|
return r;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* All functions below are related to devices and take the
|
|
|
|
* slave address and timeout values from an I2CDevRec. They
|
|
|
|
* return FALSE in case of an error (presumably a timeout).
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* General purpose read and write function.
|
|
|
|
*
|
|
|
|
* 1st, if nWrite > 0
|
|
|
|
* Send a start condition
|
|
|
|
* Send the slave address (1 or 2 bytes) with write flag
|
|
|
|
* Write n bytes from WriteBuffer
|
|
|
|
* 2nd, if nRead > 0
|
|
|
|
* Send a start condition [again]
|
|
|
|
* Send the slave address (1 or 2 bytes) with read flag
|
|
|
|
* Read n bytes to ReadBuffer
|
|
|
|
* 3rd, if a Start condition has been successfully sent,
|
|
|
|
* Send a Stop condition.
|
|
|
|
*
|
|
|
|
* The functions exits immediately when an error occures,
|
|
|
|
* not proceeding any data left. However, step 3 will
|
|
|
|
* be executed anyway to leave the bus in clean idle state.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static Bool
|
|
|
|
I2CWriteRead(I2CDevPtr d,
|
|
|
|
I2CByte *WriteBuffer, int nWrite,
|
|
|
|
I2CByte *ReadBuffer, int nRead)
|
|
|
|
{
|
|
|
|
Bool r = TRUE;
|
|
|
|
I2CBusPtr b = d->pI2CBus;
|
|
|
|
int s = 0;
|
|
|
|
|
|
|
|
if (r && nWrite > 0) {
|
|
|
|
r = b->I2CAddress(d, d->SlaveAddr & ~1);
|
|
|
|
if (r) {
|
|
|
|
for (; nWrite > 0; WriteBuffer++, nWrite--)
|
|
|
|
if (!(r = b->I2CPutByte(d, *WriteBuffer)))
|
|
|
|
break;
|
|
|
|
s++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (r && nRead > 0) {
|
|
|
|
r = b->I2CAddress(d, d->SlaveAddr | 1);
|
|
|
|
if (r) {
|
|
|
|
for (; nRead > 0; ReadBuffer++, nRead--)
|
|
|
|
if (!(r = b->I2CGetByte(d, ReadBuffer, nRead == 1)))
|
|
|
|
break;
|
|
|
|
s++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (s) b->I2CStop(d);
|
|
|
|
|
|
|
|
return r;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* wrapper - for compatibility and convinience */
|
|
|
|
|
2008-11-27 03:12:59 +01:00
|
|
|
_X_EXPORT Bool
|
2003-11-14 17:48:57 +01:00
|
|
|
xf86I2CWriteRead(I2CDevPtr d,
|
|
|
|
I2CByte *WriteBuffer, int nWrite,
|
|
|
|
I2CByte *ReadBuffer, int nRead)
|
|
|
|
{
|
|
|
|
I2CBusPtr b = d->pI2CBus;
|
|
|
|
return b->I2CWriteRead(d,WriteBuffer,nWrite,ReadBuffer,nRead);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Read a byte, the only readable register of a device.
|
|
|
|
*/
|
|
|
|
|
|
|
|
Bool
|
|
|
|
xf86I2CReadStatus(I2CDevPtr d, I2CByte *pbyte)
|
|
|
|
{
|
|
|
|
return xf86I2CWriteRead(d, NULL, 0, pbyte, 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Read a byte from one of the registers determined by its sub-address.
|
|
|
|
*/
|
|
|
|
|
2008-11-28 04:55:11 +01:00
|
|
|
_X_EXPORT Bool
|
2003-11-14 17:48:57 +01:00
|
|
|
xf86I2CReadByte(I2CDevPtr d, I2CByte subaddr, I2CByte *pbyte)
|
|
|
|
{
|
|
|
|
return xf86I2CWriteRead(d, &subaddr, 1, pbyte, 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Read bytes from subsequent registers determined by the
|
|
|
|
* sub-address of the first register.
|
|
|
|
*/
|
|
|
|
|
2008-11-28 04:55:11 +01:00
|
|
|
_X_EXPORT Bool
|
2003-11-14 17:48:57 +01:00
|
|
|
xf86I2CReadBytes(I2CDevPtr d, I2CByte subaddr, I2CByte *pbyte, int n)
|
|
|
|
{
|
|
|
|
return xf86I2CWriteRead(d, &subaddr, 1, pbyte, n);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Read a word (high byte, then low byte) from one of the registers
|
|
|
|
* determined by its sub-address.
|
|
|
|
*/
|
|
|
|
|
|
|
|
Bool
|
|
|
|
xf86I2CReadWord(I2CDevPtr d, I2CByte subaddr, unsigned short *pword)
|
|
|
|
{
|
|
|
|
I2CByte rb[2];
|
|
|
|
|
|
|
|
if (!xf86I2CWriteRead(d, &subaddr, 1, rb, 2)) return FALSE;
|
|
|
|
|
|
|
|
*pword = (rb[0] << 8) | rb[1];
|
|
|
|
|
|
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Write a byte to one of the registers determined by its sub-address.
|
|
|
|
*/
|
|
|
|
|
2008-11-28 04:55:11 +01:00
|
|
|
_X_EXPORT Bool
|
2003-11-14 17:48:57 +01:00
|
|
|
xf86I2CWriteByte(I2CDevPtr d, I2CByte subaddr, I2CByte byte)
|
|
|
|
{
|
|
|
|
I2CByte wb[2];
|
|
|
|
|
|
|
|
wb[0] = subaddr;
|
|
|
|
wb[1] = byte;
|
|
|
|
|
|
|
|
return xf86I2CWriteRead(d, wb, 2, NULL, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Write bytes to subsequent registers determined by the
|
|
|
|
* sub-address of the first register.
|
|
|
|
*/
|
|
|
|
|
|
|
|
Bool
|
|
|
|
xf86I2CWriteBytes(I2CDevPtr d, I2CByte subaddr,
|
|
|
|
I2CByte *WriteBuffer, int nWrite)
|
|
|
|
{
|
|
|
|
I2CBusPtr b = d->pI2CBus;
|
|
|
|
Bool r = TRUE;
|
|
|
|
|
|
|
|
if (nWrite > 0) {
|
|
|
|
r = b->I2CAddress(d, d->SlaveAddr & ~1);
|
|
|
|
if (r){
|
|
|
|
if ((r = b->I2CPutByte(d, subaddr)))
|
|
|
|
for (; nWrite > 0; WriteBuffer++, nWrite--)
|
|
|
|
if (!(r = b->I2CPutByte(d, *WriteBuffer)))
|
|
|
|
break;
|
|
|
|
|
|
|
|
b->I2CStop(d);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return r;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Write a word (high byte, then low byte) to one of the registers
|
|
|
|
* determined by its sub-address.
|
|
|
|
*/
|
|
|
|
|
|
|
|
Bool
|
|
|
|
xf86I2CWriteWord(I2CDevPtr d, I2CByte subaddr, unsigned short word)
|
|
|
|
{
|
|
|
|
I2CByte wb[3];
|
|
|
|
|
|
|
|
wb[0] = subaddr;
|
|
|
|
wb[1] = word >> 8;
|
|
|
|
wb[2] = word & 0xFF;
|
|
|
|
|
|
|
|
return xf86I2CWriteRead(d, wb, 3, NULL, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Write a vector of bytes to not adjacent registers. This vector is,
|
|
|
|
* 1st byte sub-address, 2nd byte value, 3rd byte sub-address asf.
|
|
|
|
* This function is intended to initialize devices. Note this function
|
|
|
|
* exits immediately when an error occurs, some registers may
|
|
|
|
* remain uninitialized.
|
|
|
|
*/
|
|
|
|
|
2008-11-28 04:55:11 +01:00
|
|
|
_X_EXPORT Bool
|
2003-11-14 17:48:57 +01:00
|
|
|
xf86I2CWriteVec(I2CDevPtr d, I2CByte *vec, int nValues)
|
|
|
|
{
|
|
|
|
I2CBusPtr b = d->pI2CBus;
|
|
|
|
Bool r = TRUE;
|
|
|
|
int s = 0;
|
|
|
|
|
|
|
|
if (nValues > 0) {
|
|
|
|
for (; nValues > 0; nValues--, vec += 2) {
|
|
|
|
if (!(r = b->I2CAddress(d, d->SlaveAddr & ~1)))
|
|
|
|
break;
|
|
|
|
|
|
|
|
s++;
|
|
|
|
|
|
|
|
if (!(r = b->I2CPutByte(d, vec[0])))
|
|
|
|
break;
|
|
|
|
|
|
|
|
if (!(r = b->I2CPutByte(d, vec[1])))
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (s > 0) b->I2CStop(d);
|
|
|
|
}
|
|
|
|
|
|
|
|
return r;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Administrative functions.
|
|
|
|
* =========================
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* Allocates an I2CDevRec for you and initializes with propper defaults
|
|
|
|
* you may modify before calling xf86I2CDevInit. Your I2CDevRec must
|
|
|
|
* contain at least a SlaveAddr, and a pI2CBus pointer to the bus this
|
|
|
|
* device shall be linked to.
|
|
|
|
*
|
|
|
|
* See function I2CAddress for the slave address format. Always set
|
|
|
|
* the least significant bit, indicating a read or write access, to zero.
|
|
|
|
*/
|
|
|
|
|
2008-11-27 03:12:59 +01:00
|
|
|
_X_EXPORT I2CDevPtr
|
2003-11-14 17:48:57 +01:00
|
|
|
xf86CreateI2CDevRec(void)
|
|
|
|
{
|
|
|
|
return xcalloc(1, sizeof(I2CDevRec));
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Unlink an I2C device. If you got the I2CDevRec from xf86CreateI2CDevRec
|
|
|
|
* you should set <unalloc> to free it.
|
|
|
|
*/
|
|
|
|
|
2008-11-28 04:55:11 +01:00
|
|
|
_X_EXPORT void
|
2003-11-14 17:48:57 +01:00
|
|
|
xf86DestroyI2CDevRec(I2CDevPtr d, Bool unalloc)
|
|
|
|
{
|
|
|
|
if (d) {
|
|
|
|
I2CDevPtr *p;
|
|
|
|
|
|
|
|
/* Remove this from the list of active I2C devices. */
|
|
|
|
|
|
|
|
for (p = &d->pI2CBus->FirstDev; *p != NULL; p = &(*p)->NextDev)
|
|
|
|
if (*p == d) {
|
|
|
|
*p = (*p)->NextDev;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
xf86DrvMsg(d->pI2CBus->scrnIndex, X_INFO,
|
|
|
|
"I2C device \"%s:%s\" removed.\n",
|
|
|
|
d->pI2CBus->BusName, d->DevName);
|
|
|
|
|
|
|
|
if (unalloc) xfree(d);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* I2C transmissions are related to an I2CDevRec you must link to a
|
|
|
|
* previously registered bus (see xf86I2CBusInit) before attempting
|
|
|
|
* to read and write data. You may call xf86I2CProbeAddress first to
|
|
|
|
* see if the device in question is present on this bus.
|
|
|
|
*
|
|
|
|
* xf86I2CDevInit will not allocate an I2CBusRec for you, instead you
|
|
|
|
* may enter a pointer to a statically allocated I2CDevRec or the (modified)
|
|
|
|
* result of xf86CreateI2CDevRec.
|
|
|
|
*
|
|
|
|
* If you don't specify timeouts for the device (n <= 0), it will inherit
|
|
|
|
* the bus-wide defaults. The function returns TRUE on success.
|
|
|
|
*/
|
|
|
|
|
2008-11-27 03:12:59 +01:00
|
|
|
_X_EXPORT Bool
|
2003-11-14 17:48:57 +01:00
|
|
|
xf86I2CDevInit(I2CDevPtr d)
|
|
|
|
{
|
|
|
|
I2CBusPtr b;
|
|
|
|
|
|
|
|
if (d == NULL ||
|
|
|
|
(b = d->pI2CBus) == NULL ||
|
|
|
|
(d->SlaveAddr & 1) ||
|
|
|
|
xf86I2CFindDev(b, d->SlaveAddr) != NULL)
|
|
|
|
return FALSE;
|
|
|
|
|
|
|
|
if (d->BitTimeout <= 0) d->BitTimeout = b->BitTimeout;
|
|
|
|
if (d->ByteTimeout <= 0) d->ByteTimeout = b->ByteTimeout;
|
|
|
|
if (d->AcknTimeout <= 0) d->AcknTimeout = b->AcknTimeout;
|
|
|
|
if (d->StartTimeout <= 0) d->StartTimeout = b->StartTimeout;
|
|
|
|
|
|
|
|
d->NextDev = b->FirstDev;
|
|
|
|
b->FirstDev = d;
|
|
|
|
|
|
|
|
xf86DrvMsg(b->scrnIndex, X_INFO,
|
|
|
|
"I2C device \"%s:%s\" registered at address 0x%02X.\n",
|
|
|
|
b->BusName, d->DevName, d->SlaveAddr);
|
|
|
|
|
|
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
|
2008-11-28 04:55:11 +01:00
|
|
|
_X_EXPORT I2CDevPtr
|
2003-11-14 17:48:57 +01:00
|
|
|
xf86I2CFindDev(I2CBusPtr b, I2CSlaveAddr addr)
|
|
|
|
{
|
|
|
|
I2CDevPtr d;
|
|
|
|
|
|
|
|
if (b) {
|
|
|
|
for (d = b->FirstDev; d != NULL; d = d->NextDev)
|
|
|
|
if (d->SlaveAddr == addr)
|
|
|
|
return d;
|
|
|
|
}
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static I2CBusPtr I2CBusList;
|
|
|
|
|
|
|
|
/* Allocates an I2CBusRec for you and initializes with propper defaults
|
|
|
|
* you may modify before calling xf86I2CBusInit. Your I2CBusRec must
|
|
|
|
* contain at least a BusName, a scrnIndex (or -1), and a complete set
|
|
|
|
* of either high or low level I2C function pointers. You may pass
|
|
|
|
* bus-wide timeouts, otherwise inplausible values will be replaced
|
|
|
|
* with safe defaults.
|
|
|
|
*/
|
|
|
|
|
2008-11-27 03:12:59 +01:00
|
|
|
_X_EXPORT I2CBusPtr
|
2003-11-14 17:48:57 +01:00
|
|
|
xf86CreateI2CBusRec(void)
|
|
|
|
{
|
|
|
|
I2CBusPtr b;
|
|
|
|
|
|
|
|
b = (I2CBusPtr) xcalloc(1, sizeof(I2CBusRec));
|
|
|
|
|
|
|
|
if (b != NULL) {
|
|
|
|
b->scrnIndex = -1;
|
|
|
|
b->HoldTime = 5; /* 100 kHz bus */
|
|
|
|
b->BitTimeout = 5;
|
|
|
|
b->ByteTimeout = 5;
|
|
|
|
b->AcknTimeout = 5;
|
|
|
|
b->StartTimeout = 5;
|
|
|
|
b->RiseFallTime = RISEFALLTIME;
|
|
|
|
}
|
|
|
|
|
|
|
|
return b;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Unregister an I2C bus. If you got the I2CBusRec from xf86CreateI2CBusRec
|
|
|
|
* you should set <unalloc> to free it. If you set <devs_too>, the function
|
|
|
|
* xf86DestroyI2CDevRec will be called for all devices linked to the bus
|
|
|
|
* first, passing down the <unalloc> option.
|
|
|
|
*/
|
|
|
|
|
2008-11-27 03:12:59 +01:00
|
|
|
_X_EXPORT void
|
2003-11-14 17:48:57 +01:00
|
|
|
xf86DestroyI2CBusRec(I2CBusPtr b, Bool unalloc, Bool devs_too)
|
|
|
|
{
|
|
|
|
if (b) {
|
|
|
|
I2CBusPtr *p;
|
|
|
|
|
2003-11-25 20:29:01 +01:00
|
|
|
/* Remove this from the list of active I2C buses */
|
2003-11-14 17:48:57 +01:00
|
|
|
|
|
|
|
for (p = &I2CBusList; *p != NULL; p = &(*p)->NextBus)
|
|
|
|
if (*p == b) {
|
|
|
|
*p = (*p)->NextBus;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (b->FirstDev != NULL) {
|
|
|
|
if (devs_too) {
|
|
|
|
I2CDevPtr d;
|
|
|
|
|
|
|
|
while ((d = b->FirstDev) != NULL) {
|
|
|
|
b->FirstDev = d->NextDev;
|
|
|
|
xf86DestroyI2CDevRec(d, unalloc);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
if (unalloc) {
|
|
|
|
xf86Msg(X_ERROR, "i2c bug: Attempt to remove I2C bus \"%s\", "
|
|
|
|
"but device list is not empty.\n",
|
|
|
|
b->BusName);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
xf86DrvMsg(b->scrnIndex, X_INFO, "I2C bus \"%s\" removed.\n",
|
|
|
|
b->BusName);
|
|
|
|
|
|
|
|
if (unalloc) xfree(b);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* I2C masters have to register themselves using this function.
|
|
|
|
* It will not allocate an I2CBusRec for you, instead you may enter
|
|
|
|
* a pointer to a statically allocated I2CBusRec or the (modified)
|
|
|
|
* result of xf86CreateI2CBusRec. Returns TRUE on success.
|
|
|
|
*
|
|
|
|
* At this point there won't be any traffic on the I2C bus.
|
|
|
|
*/
|
|
|
|
|
2008-11-27 03:12:59 +01:00
|
|
|
_X_EXPORT Bool
|
2003-11-14 17:48:57 +01:00
|
|
|
xf86I2CBusInit(I2CBusPtr b)
|
|
|
|
{
|
2003-11-25 20:29:01 +01:00
|
|
|
/* I2C buses must be identified by a unique scrnIndex
|
2003-11-14 17:48:57 +01:00
|
|
|
* and name. If scrnIndex is unspecified (a negative value),
|
|
|
|
* then the name must be unique throughout the server.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (b->BusName == NULL ||
|
|
|
|
xf86I2CFindBus(b->scrnIndex, b->BusName) != NULL)
|
|
|
|
return FALSE;
|
|
|
|
|
|
|
|
/* If the high level functions are not
|
|
|
|
* supplied, use the generic functions.
|
|
|
|
* In this case we need the low-level
|
|
|
|
* function.
|
|
|
|
*/
|
|
|
|
if (b->I2CWriteRead == NULL)
|
|
|
|
{
|
|
|
|
b->I2CWriteRead=I2CWriteRead;
|
|
|
|
|
|
|
|
if (b->I2CPutBits == NULL ||
|
|
|
|
b->I2CGetBits == NULL)
|
|
|
|
{
|
|
|
|
if (b->I2CPutByte == NULL ||
|
|
|
|
b->I2CGetByte == NULL ||
|
|
|
|
b->I2CAddress == NULL ||
|
2004-07-27 04:50:41 +02:00
|
|
|
b->I2CStart == NULL ||
|
2003-11-14 17:48:57 +01:00
|
|
|
b->I2CStop == NULL)
|
|
|
|
return FALSE;
|
|
|
|
} else {
|
|
|
|
b->I2CPutByte = I2CPutByte;
|
|
|
|
b->I2CGetByte = I2CGetByte;
|
|
|
|
b->I2CAddress = I2CAddress;
|
|
|
|
b->I2CStop = I2CStop;
|
2004-07-27 04:50:41 +02:00
|
|
|
b->I2CStart = I2CStart;
|
2003-11-14 17:48:57 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (b->I2CUDelay == NULL)
|
|
|
|
b->I2CUDelay = I2CUDelay;
|
|
|
|
|
|
|
|
if (b->HoldTime < 2) b->HoldTime = 5;
|
|
|
|
if (b->BitTimeout <= 0) b->BitTimeout = b->HoldTime;
|
|
|
|
if (b->ByteTimeout <= 0) b->ByteTimeout = b->HoldTime;
|
|
|
|
if (b->AcknTimeout <= 0) b->AcknTimeout = b->HoldTime;
|
|
|
|
if (b->StartTimeout <= 0) b->StartTimeout = b->HoldTime;
|
|
|
|
|
|
|
|
/* Put new bus on list. */
|
|
|
|
|
|
|
|
b->NextBus = I2CBusList;
|
|
|
|
I2CBusList = b;
|
|
|
|
|
|
|
|
xf86DrvMsg(b->scrnIndex, X_INFO, "I2C bus \"%s\" initialized.\n",
|
|
|
|
b->BusName);
|
|
|
|
|
|
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
|
2008-11-28 04:55:11 +01:00
|
|
|
_X_EXPORT I2CBusPtr
|
2003-11-14 17:48:57 +01:00
|
|
|
xf86I2CFindBus(int scrnIndex, char *name)
|
|
|
|
{
|
|
|
|
I2CBusPtr p;
|
|
|
|
|
|
|
|
if (name != NULL)
|
|
|
|
for (p = I2CBusList; p != NULL; p = p->NextBus)
|
|
|
|
if (scrnIndex < 0 || p->scrnIndex == scrnIndex)
|
|
|
|
if (!strcmp(p->BusName, name))
|
|
|
|
return p;
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
}
|
2003-11-25 20:29:01 +01:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Return an array of I2CBusPtr's related to a screen. The caller is
|
|
|
|
* responsible for freeing the array.
|
|
|
|
*/
|
2008-11-28 04:55:11 +01:00
|
|
|
_X_EXPORT int
|
2003-11-25 20:29:01 +01:00
|
|
|
xf86I2CGetScreenBuses(int scrnIndex, I2CBusPtr **pppI2CBus)
|
|
|
|
{
|
|
|
|
I2CBusPtr pI2CBus;
|
|
|
|
int n = 0;
|
|
|
|
|
|
|
|
if (pppI2CBus)
|
|
|
|
*pppI2CBus = NULL;
|
|
|
|
|
|
|
|
for (pI2CBus = I2CBusList; pI2CBus; pI2CBus = pI2CBus->NextBus) {
|
|
|
|
if ((pI2CBus->scrnIndex >= 0) && (pI2CBus->scrnIndex != scrnIndex))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
n++;
|
|
|
|
|
|
|
|
if (!pppI2CBus)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
*pppI2CBus = xnfrealloc(*pppI2CBus, n * sizeof(I2CBusPtr));
|
2007-09-04 16:42:57 +02:00
|
|
|
(*pppI2CBus)[n - 1] = pI2CBus;
|
2003-11-25 20:29:01 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
return n;
|
|
|
|
}
|