124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
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/*
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* 7 Segment LED routines
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* Based on RBTX49xx patch from CELF patch archive.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* (C) Copyright TOSHIBA CORPORATION 2005-2007
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* All Rights Reserved.
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*/
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/map_to_7segment.h>
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#include <asm/txx9/generic.h>
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static unsigned int tx_7segled_num;
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static void (*tx_7segled_putc)(unsigned int pos, unsigned char val);
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void __init txx9_7segled_init(unsigned int num,
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void (*putc)(unsigned int pos, unsigned char val))
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{
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tx_7segled_num = num;
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tx_7segled_putc = putc;
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}
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static SEG7_CONVERSION_MAP(txx9_seg7map, MAP_ASCII7SEG_ALPHANUM_LC);
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int txx9_7segled_putc(unsigned int pos, char c)
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{
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if (pos >= tx_7segled_num)
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return -EINVAL;
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c = map_to_seg7(&txx9_seg7map, c);
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if (c < 0)
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return c;
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tx_7segled_putc(pos, c);
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return 0;
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}
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static ssize_t ascii_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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unsigned int ch = dev->id;
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txx9_7segled_putc(ch, buf[0]);
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return size;
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}
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static ssize_t raw_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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unsigned int ch = dev->id;
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tx_7segled_putc(ch, buf[0]);
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return size;
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}
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static DEVICE_ATTR_WO(ascii);
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static DEVICE_ATTR_WO(raw);
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static ssize_t map_seg7_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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memcpy(buf, &txx9_seg7map, sizeof(txx9_seg7map));
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return sizeof(txx9_seg7map);
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}
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static ssize_t map_seg7_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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if (size != sizeof(txx9_seg7map))
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return -EINVAL;
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memcpy(&txx9_seg7map, buf, size);
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return size;
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}
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static DEVICE_ATTR(map_seg7, 0600, map_seg7_show, map_seg7_store);
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static struct bus_type tx_7segled_subsys = {
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.name = "7segled",
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.dev_name = "7segled",
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};
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static void tx_7segled_release(struct device *dev)
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{
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kfree(dev);
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}
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static int __init tx_7segled_init_sysfs(void)
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{
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int error, i;
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if (!tx_7segled_num)
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return -ENODEV;
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error = subsys_system_register(&tx_7segled_subsys, NULL);
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if (error)
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return error;
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error = device_create_file(tx_7segled_subsys.dev_root, &dev_attr_map_seg7);
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if (error)
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return error;
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for (i = 0; i < tx_7segled_num; i++) {
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struct device *dev;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev) {
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error = -ENODEV;
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break;
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}
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dev->id = i;
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dev->bus = &tx_7segled_subsys;
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dev->release = &tx_7segled_release;
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error = device_register(dev);
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if (error) {
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put_device(dev);
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return error;
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}
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device_create_file(dev, &dev_attr_ascii);
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device_create_file(dev, &dev_attr_raw);
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}
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return error;
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}
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device_initcall(tx_7segled_init_sysfs);
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