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

   1 /*
   2  * 7 Segment LED routines
   3  * Based on RBTX49xx patch from CELF patch archive.
   4  *
   5  * This file is subject to the terms and conditions of the GNU General Public
   6  * License.  See the file "COPYING" in the main directory of this archive
   7  * for more details.
   8  *
   9  * (C) Copyright TOSHIBA CORPORATION 2005-2007
  10  * All Rights Reserved.
  11  */
  12 #include <linux/sysdev.h>
  13 #include <linux/slab.h>
  14 #include <linux/map_to_7segment.h>
  15 #include <asm/txx9/generic.h>
  16
  17 static unsigned int tx_7segled_num;
  18 static void (*tx_7segled_putc)(unsigned int pos, unsigned char val);
  19
  20 void __init txx9_7segled_init(unsigned int num,
  21                               void (*putc)(unsigned int pos, unsigned char val))
  22 {
  23         tx_7segled_num = num;
  24         tx_7segled_putc = putc;
  25 }
  26
  27 static SEG7_CONVERSION_MAP(txx9_seg7map, MAP_ASCII7SEG_ALPHANUM_LC);
  28
  29 int txx9_7segled_putc(unsigned int pos, char c)
  30 {
  31         if (pos >= tx_7segled_num)
  32                 return -EINVAL;
  33         c = map_to_seg7(&txx9_seg7map, c);
  34         if (c < 0)
  35                 return c;
  36         tx_7segled_putc(pos, c);
  37         return 0;
  38 }
  39
  40 static ssize_t ascii_store(struct sys_device *dev,
  41                            struct sysdev_attribute *attr,
  42                            const char *buf, size_t size)
  43 {
  44         unsigned int ch = dev->id;
  45         txx9_7segled_putc(ch, buf[0]);
  46         return size;
  47 }
  48
  49 static ssize_t raw_store(struct sys_device *dev,
  50                          struct sysdev_attribute *attr,
  51                          const char *buf, size_t size)
  52 {
  53         unsigned int ch = dev->id;
  54         tx_7segled_putc(ch, buf[0]);
  55         return size;
  56 }
  57
  58 static SYSDEV_ATTR(ascii, 0200, NULL, ascii_store);
  59 static SYSDEV_ATTR(raw, 0200, NULL, raw_store);
  60
  61 static ssize_t map_seg7_show(struct sysdev_class *class, char *buf)
  62 {
  63         memcpy(buf, &txx9_seg7map, sizeof(txx9_seg7map));
  64         return sizeof(txx9_seg7map);
  65 }
  66
  67 static ssize_t map_seg7_store(struct sysdev_class *class,
  68                               const char *buf, size_t size)
  69 {
  70         if (size != sizeof(txx9_seg7map))
  71                 return -EINVAL;
  72         memcpy(&txx9_seg7map, buf, size);
  73         return size;
  74 }
  75
  76 static SYSDEV_CLASS_ATTR(map_seg7, 0600, map_seg7_show, map_seg7_store);
  77
  78 static struct sysdev_class tx_7segled_sysdev_class = {
  79         .name   = "7segled",
  80 };
  81
  82 static int __init tx_7segled_init_sysfs(void)
  83 {
  84         int error, i;
  85         if (!tx_7segled_num)
  86                 return -ENODEV;
  87         error = sysdev_class_register(&tx_7segled_sysdev_class);
  88         if (error)
  89                 return error;
  90         error = sysdev_class_create_file(&tx_7segled_sysdev_class,
  91                                          &attr_map_seg7);
  92         if (error)
  93                 return error;
  94         for (i = 0; i < tx_7segled_num; i++) {
  95                 struct sys_device *dev;
  96                 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
  97                 if (!dev) {
  98                         error = -ENODEV;
  99                         break;
 100                 }
 101                 dev->id = i;
 102                 dev->cls = &tx_7segled_sysdev_class;
 103                 error = sysdev_register(dev);
 104                 if (!error) {
 105                         sysdev_create_file(dev, &attr_ascii);
 106                         sysdev_create_file(dev, &attr_raw);
 107                 }
 108         }
 109         return error;
 110 }
 111
 112 device_initcall(tx_7segled_init_sysfs);