MIPS: TXx9: 7 segment LED support

Add sysfs interface for 7 segment LED and implement access routine for
RBTX4939.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/txx9/generic/7segled.c

@@ -0,0 +1,112 @@
+/*
+ * 7 Segment LED routines
+ * Based on RBTX49xx patch from CELF patch archive.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * (C) Copyright TOSHIBA CORPORATION 2005-2007
+ * All Rights Reserved.
+ */
+#include <linux/sysdev.h>
+#include <linux/slab.h>
+#include <linux/map_to_7segment.h>
+#include <asm/txx9/generic.h>
+
+static unsigned int tx_7segled_num;
+static void (*tx_7segled_putc)(unsigned int pos, unsigned char val);
+
+void __init txx9_7segled_init(unsigned int num,
+			      void (*putc)(unsigned int pos, unsigned char val))
+{
+	tx_7segled_num = num;
+	tx_7segled_putc = putc;
+}
+
+static SEG7_CONVERSION_MAP(txx9_seg7map, MAP_ASCII7SEG_ALPHANUM_LC);
+
+int txx9_7segled_putc(unsigned int pos, char c)
+{
+	if (pos >= tx_7segled_num)
+		return -EINVAL;
+	c = map_to_seg7(&txx9_seg7map, c);
+	if (c < 0)
+		return c;
+	tx_7segled_putc(pos, c);
+	return 0;
+}
+
+static ssize_t ascii_store(struct sys_device *dev,
+			   struct sysdev_attribute *attr,
+			   const char *buf, size_t size)
+{
+	unsigned int ch = dev->id;
+	txx9_7segled_putc(ch, buf[0]);
+	return size;
+}
+
+static ssize_t raw_store(struct sys_device *dev,
+			 struct sysdev_attribute *attr,
+			 const char *buf, size_t size)
+{
+	unsigned int ch = dev->id;
+	tx_7segled_putc(ch, buf[0]);
+	return size;
+}
+
+static SYSDEV_ATTR(ascii, 0200, NULL, ascii_store);
+static SYSDEV_ATTR(raw, 0200, NULL, raw_store);
+
+static ssize_t map_seg7_show(struct sysdev_class *class, char *buf)
+{
+	memcpy(buf, &txx9_seg7map, sizeof(txx9_seg7map));
+	return sizeof(txx9_seg7map);
+}
+
+static ssize_t map_seg7_store(struct sysdev_class *class,
+			      const char *buf, size_t size)
+{
+	if (size != sizeof(txx9_seg7map))
+		return -EINVAL;
+	memcpy(&txx9_seg7map, buf, size);
+	return size;
+}
+
+static SYSDEV_CLASS_ATTR(map_seg7, 0600, map_seg7_show, map_seg7_store);
+
+static struct sysdev_class tx_7segled_sysdev_class = {
+	.name	= "7segled",
+};
+
+static int __init tx_7segled_init_sysfs(void)
+{
+	int error, i;
+	if (!tx_7segled_num)
+		return -ENODEV;
+	error = sysdev_class_register(&tx_7segled_sysdev_class);
+	if (error)
+		return error;
+	error = sysdev_class_create_file(&tx_7segled_sysdev_class,
+					 &attr_map_seg7);
+	if (error)
+		return error;
+	for (i = 0; i < tx_7segled_num; i++) {
+		struct sys_device *dev;
+		dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+		if (!dev) {
+			error = -ENODEV;
+			break;
+		}
+		dev->id = i;
+		dev->cls = &tx_7segled_sysdev_class;
+		error = sysdev_register(dev);
+		if (!error) {
+			sysdev_create_file(dev, &attr_ascii);
+			sysdev_create_file(dev, &attr_raw);
+		}
+	}
+	return error;
+}
+
+device_initcall(tx_7segled_init_sysfs);