Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 507 insertions, 0 deletions

diff --git a/drivers/i2c/algos/i2c-algo-pcf.c b/drivers/i2c/algos/i2c-algo-pcf.c
new file mode 100644
index 000000000000..8d087dac32af
--- /dev/null
+++ b/drivers/i2c/algos/i2c-algo-pcf.c
@@ -0,0 +1,507 @@
+/* ------------------------------------------------------------------------- */
+/* 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., 675 Mass Ave, Cambridge, MA 02139, USA.		     */
+/* ------------------------------------------------------------------------- */
+
+/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and 
+   Frodo Looijaard <frodol@dds.nl> ,and also from Martin Bailey
+   <mbailey@littlefeet-inc.com> */
+
+/* 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/slab.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("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 int wait_for_bb(struct i2c_algo_pcf_data *adap) {
+
+	int timeout = DEF_TIMEOUT;
+	int status;
+
+	status = get_pcf(adap, 1);
+#ifndef STUB_I2C
+	while (timeout-- && !(status & I2C_PCF_BB)) {
+		udelay(100); /* wait for 100 us */
+		status = get_pcf(adap, 1);
+	}
+#endif
+	if (timeout <= 0) {
+		printk(KERN_ERR "Timeout waiting for Bus Busy\n");
+	}
+	
+	return (timeout<=0);
+}
+
+
+static int wait_for_pin(struct i2c_algo_pcf_data *adap, int *status) {
+
+	int timeout = DEF_TIMEOUT;
+
+	*status = get_pcf(adap, 1);
+#ifndef STUB_I2C
+	while (timeout-- && (*status & I2C_PCF_PIN)) {
+		adap->waitforpin();
+		*status = get_pcf(adap, 1);
+	}
+	if (*status & I2C_PCF_LAB) {
+		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);
+		/* TODO: we should 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.
+		 */
+		DEB2(printk(KERN_INFO 
+			"i2c-algo-pcf.o: reset LAB condition (CSR 0x%02x)\n", 
+			get_pcf(adap,1)));
+		return(-EINTR);
+	}
+#endif
+	if (timeout <= 0)
+		return(-1);
+	else
+		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; /* definetly 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: deteted and initialized PCF8584.\n");
+
+	return 0;
+}
+
+
+/* ----- Utility functions
+ */
+
+static inline int try_address(struct i2c_algo_pcf_data *adap,
+		       unsigned char addr, int retries)
+{
+	int i, status, ret = -1;
+	int wfp;
+	for (i=0;i<retries;i++) {
+		i2c_outb(adap, addr);
+		i2c_start(adap);
+		status = get_pcf(adap, 1);
+		if ((wfp = wait_for_pin(adap, &status)) >= 0) {
+			if ((status & I2C_PCF_LRB) == 0) { 
+				i2c_stop(adap);
+				break;	/* success! */
+			}
+		}
+		if (wfp == -EINTR) {
+			/* arbitration lost */
+			udelay(adap->udelay);
+			return -EINTR;
+		}
+		i2c_stop(adap);
+		udelay(adap->udelay);
+	}
+	DEB2(if (i) printk(KERN_DEBUG "i2c-algo-pcf.o: needed %d retries for %d\n",i,
+	                   addr));
+	return ret;
+}
+
+
+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) {
+				/* arbitration lost */
+				return -EINTR;
+			}
+			i2c_stop(adap);
+			dev_err(&i2c_adap->dev, "i2c_write: error - timeout.\n");
+			return -EREMOTEIO; /* got a better one ?? */
+		}
+#ifndef STUB_I2C
+		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 ?? */
+		}
+#endif
+	}
+	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) {
+				/* arbitration lost */
+				return -EINTR;
+			}
+			i2c_stop(adap);
+			dev_err(&i2c_adap->dev, "pcf_readbytes timed out.\n");
+			return (-1);
+		}
+
+#ifndef STUB_I2C
+		if ((status & I2C_PCF_LRB) && (i != count)) {
+			i2c_stop(adap);
+			dev_err(&i2c_adap->dev, "i2c_read: i2c_inb, No ack.\n");
+			return (-1);
+		}
+#endif
+		
+		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 inline int pcf_doAddress(struct i2c_algo_pcf_data *adap,
+                                struct i2c_msg *msg, int retries) 
+{
+	unsigned short flags = msg->flags;
+	unsigned char addr;
+	int ret;
+	if ( (flags & I2C_M_TEN)  ) { 
+		/* a ten bit address */
+		addr = 0xf0 | (( msg->addr >> 7) & 0x03);
+		DEB2(printk(KERN_DEBUG "addr0: %d\n",addr));
+		/* try extended address code...*/
+		ret = try_address(adap, addr, retries);
+		if (ret!=1) {
+			printk(KERN_ERR "died at extended address code.\n");
+			return -EREMOTEIO;
+		}
+		/* the remaining 8 bit address */
+		i2c_outb(adap,msg->addr & 0x7f);
+/* Status check comes here */
+		if (ret != 1) {
+			printk(KERN_ERR "died at 2nd address code.\n");
+			return -EREMOTEIO;
+		}
+		if ( flags & I2C_M_RD ) {
+			i2c_repstart(adap);
+			/* okay, now switch into reading mode */
+			addr |= 0x01;
+			ret = try_address(adap, addr, retries);
+			if (ret!=1) {
+				printk(KERN_ERR "died at extended address code.\n");
+				return -EREMOTEIO;
+			}
+		}
+	} else {		/* normal 7bit address	*/
+		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;
+    
+
+	/* 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");)
+		return -EIO;
+	}
+	
+	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, i2c_adap->retries);
+
+		/* 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 */
+				return (-EINTR);
+			}
+			i2c_stop(adap);
+			DEB2(printk(KERN_ERR "i2c-algo-pcf.o: Timeout waiting "
+				    "for PIN(1) in pcf_xfer\n");)
+			return (-EREMOTEIO);
+		}
+    
+#ifndef STUB_I2C
+		/* 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");)
+			return (-EREMOTEIO);
+		}
+#endif
+    
+		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);)
+    
+		/* Read */
+		if (pmsg->flags & I2C_M_RD) {
+			/* read bytes into buffer*/
+			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 { /* Write */
+			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));
+			}
+		}
+	}
+
+	return (i);
+}
+
+static u32 pcf_func(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | 
+	       I2C_FUNC_10BIT_ADDR | I2C_FUNC_PROTOCOL_MANGLING; 
+}
+
+/* -----exported algorithm data: -------------------------------------	*/
+
+static struct i2c_algorithm pcf_algo = {
+	.name		= "PCF8584 algorithm",
+	.id		= I2C_ALGO_PCF,
+	.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->id |= pcf_algo.id;
+	adap->algo = &pcf_algo;
+
+	adap->timeout = 100;		/* default values, should	*/
+	adap->retries = 3;		/* be replaced by defines	*/
+
+	rval = pcf_init_8584(pcf_adap);
+	if (!rval)
+		i2c_add_adapter(adap);
+	return rval;
+}
+
+
+int i2c_pcf_del_bus(struct i2c_adapter *adap)
+{
+	return i2c_del_adapter(adap);
+}
+
+EXPORT_SYMBOL(i2c_pcf_add_bus);
+EXPORT_SYMBOL(i2c_pcf_del_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");