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/device.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 device *dev,
  41                            struct device_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 device *dev,
  50                          struct device_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 DEVICE_ATTR_WO(ascii);
  59 static DEVICE_ATTR_WO(raw);
  60
  61 static ssize_t map_seg7_show(struct device *dev,
  62                              struct device_attribute *attr,
  63                              char *buf)
  64 {
  65         memcpy(buf, &txx9_seg7map, sizeof(txx9_seg7map));
  66         return sizeof(txx9_seg7map);
  67 }
  68
  69 static ssize_t map_seg7_store(struct device *dev,
  70                               struct device_attribute *attr,
  71                               const char *buf, size_t size)
  72 {
  73         if (size != sizeof(txx9_seg7map))
  74                 return -EINVAL;
  75         memcpy(&txx9_seg7map, buf, size);
  76         return size;
  77 }
  78
  79 static DEVICE_ATTR(map_seg7, 0600, map_seg7_show, map_seg7_store);
  80
  81 static struct bus_type tx_7segled_subsys = {
  82         .name           = "7segled",
  83         .dev_name       = "7segled",
  84 };
  85
  86 static void tx_7segled_release(struct device *dev)
  87 {
  88         kfree(dev);
  89 }
  90
  91 static int __init tx_7segled_init_sysfs(void)
  92 {
  93         int error, i;
  94         if (!tx_7segled_num)
  95                 return -ENODEV;
  96         error = subsys_system_register(&tx_7segled_subsys, NULL);
  97         if (error)
  98                 return error;
  99         error = device_create_file(tx_7segled_subsys.dev_root, &dev_attr_map_seg7);
 100         if (error)
 101                 return error;
 102         for (i = 0; i < tx_7segled_num; i++) {
 103                 struct device *dev;
 104                 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 105                 if (!dev) {
 106                         error = -ENODEV;
 107                         break;
 108                 }
 109                 dev->id = i;
 110                 dev->bus = &tx_7segled_subsys;
 111                 dev->release = &tx_7segled_release;
 112                 error = device_register(dev);
 113                 if (error) {
 114                         put_device(dev);
 115                         return error;
 116                 }
 117                 device_create_file(dev, &dev_attr_ascii);
 118                 device_create_file(dev, &dev_attr_raw);
 119         }
 120         return error;
 121 }
 122
 123 device_initcall(tx_7segled_init_sysfs);