Linux-2.6.12-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, 234 insertions, 0 deletions

diff --git a/drivers/sbus/char/display7seg.c b/drivers/sbus/char/display7seg.c
new file mode 100644
index 000000000000..dbad7f35eb0a
--- /dev/null
+++ b/drivers/sbus/char/display7seg.c
@@ -0,0 +1,234 @@
+/* $Id: display7seg.c,v 1.6 2002/01/08 16:00:16 davem Exp $
+ *
+ * display7seg - Driver implementation for the 7-segment display
+ * present on Sun Microsystems CP1400 and CP1500
+ *
+ * Copyright (c) 2000 Eric Brower (ebrower@usa.net)
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/major.h>
+#include <linux/init.h>
+#include <linux/miscdevice.h>
+#include <linux/ioport.h>		/* request_region, check_region */
+#include <asm/atomic.h>
+#include <asm/ebus.h>			/* EBus device					*/
+#include <asm/oplib.h>			/* OpenProm Library 			*/
+#include <asm/uaccess.h>		/* put_/get_user			*/
+
+#include <asm/display7seg.h>
+
+#define D7S_MINOR	193
+#define D7S_OBPNAME	"display7seg"
+#define D7S_DEVNAME "d7s"
+
+static int sol_compat = 0;		/* Solaris compatibility mode	*/
+
+#ifdef MODULE
+
+/* Solaris compatibility flag -
+ * The Solaris implementation omits support for several
+ * documented driver features (ref Sun doc 806-0180-03).  
+ * By default, this module supports the documented driver 
+ * abilities, rather than the Solaris implementation:
+ *
+ * 	1) Device ALWAYS reverts to OBP-specified FLIPPED mode
+ * 	   upon closure of device or module unload.
+ * 	2) Device ioctls D7SIOCRD/D7SIOCWR honor toggling of
+ * 	   FLIP bit
+ *
+ * If you wish the device to operate as under Solaris,
+ * omitting above features, set this parameter to non-zero.
+ */
+module_param
+	(sol_compat, int, 0);
+MODULE_PARM_DESC
+	(sol_compat, 
+	 "Disables documented functionality omitted from Solaris driver");
+
+MODULE_AUTHOR
+	("Eric Brower <ebrower@usa.net>");
+MODULE_DESCRIPTION
+	("7-Segment Display driver for Sun Microsystems CP1400/1500");
+MODULE_LICENSE("GPL");
+MODULE_SUPPORTED_DEVICE
+	("d7s");
+#endif /* ifdef MODULE */
+
+/*
+ * Register block address- see header for details
+ * -----------------------------------------
+ * | DP | ALARM | FLIP | 4 | 3 | 2 | 1 | 0 |
+ * -----------------------------------------
+ *
+ * DP 		- Toggles decimal point on/off 
+ * ALARM	- Toggles "Alarm" LED green/red
+ * FLIP		- Inverts display for upside-down mounted board
+ * bits 0-4	- 7-segment display contents
+ */
+static void __iomem* d7s_regs;
+
+static inline void d7s_free(void)
+{
+	iounmap(d7s_regs);
+}
+
+static inline int d7s_obpflipped(void)
+{
+	int opt_node;
+
+	opt_node = prom_getchild(prom_root_node);
+	opt_node = prom_searchsiblings(opt_node, "options");
+	return ((-1 != prom_getintdefault(opt_node, "d7s-flipped?", -1)) ? 0 : 1);
+}
+
+static atomic_t d7s_users = ATOMIC_INIT(0);
+
+static int d7s_open(struct inode *inode, struct file *f)
+{
+	if (D7S_MINOR != iminor(inode))
+		return -ENODEV;
+	atomic_inc(&d7s_users);
+	return 0;
+}
+
+static int d7s_release(struct inode *inode, struct file *f)
+{
+	/* Reset flipped state to OBP default only if
+	 * no other users have the device open and we
+	 * are not operating in solaris-compat mode
+	 */
+	if (atomic_dec_and_test(&d7s_users) && !sol_compat) {
+		int regval = 0;
+
+		regval = readb(d7s_regs);
+		(0 == d7s_obpflipped())	? 
+			writeb(regval |= D7S_FLIP,  d7s_regs): 
+			writeb(regval &= ~D7S_FLIP, d7s_regs);
+	}
+
+	return 0;
+}
+
+static int d7s_ioctl(struct inode *inode, struct file *f, 
+		     unsigned int cmd, unsigned long arg)
+{
+	__u8 regs = readb(d7s_regs);
+	__u8 ireg = 0;
+
+	if (D7S_MINOR != iminor(inode))
+		return -ENODEV;
+
+	switch (cmd) {
+	case D7SIOCWR:
+		/* assign device register values
+		 * we mask-out D7S_FLIP if in sol_compat mode
+		 */
+		if (get_user(ireg, (int __user *) arg))
+			return -EFAULT;
+		if (0 != sol_compat) {
+			(regs & D7S_FLIP) ? 
+				(ireg |= D7S_FLIP) : (ireg &= ~D7S_FLIP);
+		}
+		writeb(ireg, d7s_regs);
+		break;
+
+	case D7SIOCRD:
+		/* retrieve device register values
+		 * NOTE: Solaris implementation returns D7S_FLIP bit
+		 * as toggled by user, even though it does not honor it.
+		 * This driver will not misinform you about the state
+		 * of your hardware while in sol_compat mode
+		 */
+		if (put_user(regs, (int __user *) arg))
+			return -EFAULT;
+		break;
+
+	case D7SIOCTM:
+		/* toggle device mode-- flip display orientation */
+		(regs & D7S_FLIP) ? 
+			(regs &= ~D7S_FLIP) : (regs |= D7S_FLIP);
+		writeb(regs, d7s_regs);
+		break;
+	};
+
+	return 0;
+}
+
+static struct file_operations d7s_fops = {
+	.owner =	THIS_MODULE,
+	.ioctl =	d7s_ioctl,
+	.open =		d7s_open,
+	.release =	d7s_release,
+};
+
+static struct miscdevice d7s_miscdev = { D7S_MINOR, D7S_DEVNAME, &d7s_fops };
+
+static int __init d7s_init(void)
+{
+	struct linux_ebus *ebus = NULL;
+	struct linux_ebus_device *edev = NULL;
+	int iTmp = 0, regs = 0;
+
+	for_each_ebus(ebus) {
+		for_each_ebusdev(edev, ebus) {
+			if (!strcmp(edev->prom_name, D7S_OBPNAME))
+				goto ebus_done;
+		}
+	}
+
+ebus_done:
+	if(!edev) {
+		printk("%s: unable to locate device\n", D7S_DEVNAME);
+		return -ENODEV;
+	}
+
+	d7s_regs = ioremap(edev->resource[0].start, sizeof(__u8));
+
+	iTmp = misc_register(&d7s_miscdev);
+	if (0 != iTmp) {
+		printk("%s: unable to acquire miscdevice minor %i\n",
+		       D7S_DEVNAME, D7S_MINOR);
+		iounmap(d7s_regs);
+		return iTmp;
+	}
+
+	/* OBP option "d7s-flipped?" is honored as default
+	 * for the device, and reset default when detached
+	 */
+	regs = readb(d7s_regs);
+	iTmp = d7s_obpflipped();
+	(0 == iTmp) ? 
+		writeb(regs |= D7S_FLIP,  d7s_regs): 
+		writeb(regs &= ~D7S_FLIP, d7s_regs);
+
+	printk("%s: 7-Segment Display%s at 0x%lx %s\n", 
+	       D7S_DEVNAME,
+	       (0 == iTmp) ? (" (FLIPPED)") : (""),
+	       edev->resource[0].start,
+	       (0 != sol_compat) ? ("in sol_compat mode") : (""));
+
+	return 0;
+}
+
+static void __exit d7s_cleanup(void)
+{
+	int regs = readb(d7s_regs);
+
+	/* Honor OBP d7s-flipped? unless operating in solaris-compat mode */
+	if (0 == sol_compat) {
+		(0 == d7s_obpflipped())	? 
+			writeb(regs |= D7S_FLIP,  d7s_regs):
+			writeb(regs &= ~D7S_FLIP, d7s_regs);
+	}
+
+	misc_deregister(&d7s_miscdev);
+	d7s_free();
+}
+
+module_init(d7s_init);
+module_exit(d7s_cleanup);