drivers/media/video/bt8xx/bttv-gpio.c

   1 /*
   2
   3     bttv-gpio.c  --  gpio sub drivers
   4
   5     sysfs-based sub driver interface for bttv
   6     mainly intented for gpio access
   7
   8
   9     Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
  10                            & Marcus Metzler (mocm@thp.uni-koeln.de)
  11     (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
  12
  13     This program is free software; you can redistribute it and/or modify
  14     it under the terms of the GNU General Public License as published by
  15     the Free Software Foundation; either version 2 of the License, or
  16     (at your option) any later version.
  17
  18     This program is distributed in the hope that it will be useful,
  19     but WITHOUT ANY WARRANTY; without even the implied warranty of
  20     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21     GNU General Public License for more details.
  22
  23     You should have received a copy of the GNU General Public License
  24     along with this program; if not, write to the Free Software
  25     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26
  27 */
  28
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31 #include <linux/delay.h>
  32 #include <linux/device.h>
  33 #include <asm/io.h>
  34
  35 #include "bttvp.h"
  36
  37 /* ----------------------------------------------------------------------- */
  38 /* internal: the bttv "bus"                                                */
  39
  40 static int bttv_sub_bus_match(struct device *dev, struct device_driver *drv)
  41 {
  42         struct bttv_sub_driver *sub = to_bttv_sub_drv(drv);
  43         int len = strlen(sub->wanted);
  44
  45         if (0 == strncmp(dev->bus_id, sub->wanted, len))
  46                 return 1;
  47         return 0;
  48 }
  49
  50 static int bttv_sub_probe(struct device *dev)
  51 {
  52         struct bttv_sub_device *sdev = to_bttv_sub_dev(dev);
  53         struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver);
  54
  55         return sub->probe ? sub->probe(sdev) : -ENODEV;
  56 }
  57
  58 static int bttv_sub_remove(struct device *dev)
  59 {
  60         struct bttv_sub_device *sdev = to_bttv_sub_dev(dev);
  61         struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver);
  62
  63         if (sub->remove)
  64                 sub->remove(sdev);
  65         return 0;
  66 }
  67
  68 struct bus_type bttv_sub_bus_type = {
  69         .name   = "bttv-sub",
  70         .match  = &bttv_sub_bus_match,
  71         .probe  = bttv_sub_probe,
  72         .remove = bttv_sub_remove,
  73 };
  74
  75 static void release_sub_device(struct device *dev)
  76 {
  77         struct bttv_sub_device *sub = to_bttv_sub_dev(dev);
  78         kfree(sub);
  79 }
  80
  81 int bttv_sub_add_device(struct bttv_core *core, char *name)
  82 {
  83         struct bttv_sub_device *sub;
  84         int err;
  85
  86         sub = kzalloc(sizeof(*sub),GFP_KERNEL);
  87         if (NULL == sub)
  88                 return -ENOMEM;
  89
  90         sub->core        = core;
  91         sub->dev.parent  = &core->pci->dev;
  92         sub->dev.bus     = &bttv_sub_bus_type;
  93         sub->dev.release = release_sub_device;
  94         snprintf(sub->dev.bus_id,sizeof(sub->dev.bus_id),"%s%d",
  95                  name, core->nr);
  96
  97         err = device_register(&sub->dev);
  98         if (0 != err) {
  99                 kfree(sub);
 100                 return err;
 101         }
 102         printk("bttv%d: add subdevice \"%s\"\n", core->nr, sub->dev.bus_id);
 103         list_add_tail(&sub->list,&core->subs);
 104         return 0;
 105 }
 106
 107 int bttv_sub_del_devices(struct bttv_core *core)
 108 {
 109         struct bttv_sub_device *sub, *save;
 110
 111         list_for_each_entry_safe(sub, save, &core->subs, list) {
 112                 list_del(&sub->list);
 113                 device_unregister(&sub->dev);
 114         }
 115         return 0;
 116 }
 117
 118 /* ----------------------------------------------------------------------- */
 119 /* external: sub-driver register/unregister                                */
 120
 121 int bttv_sub_register(struct bttv_sub_driver *sub, char *wanted)
 122 {
 123         sub->drv.bus = &bttv_sub_bus_type;
 124         snprintf(sub->wanted,sizeof(sub->wanted),"%s",wanted);
 125         return driver_register(&sub->drv);
 126 }
 127 EXPORT_SYMBOL(bttv_sub_register);
 128
 129 int bttv_sub_unregister(struct bttv_sub_driver *sub)
 130 {
 131         driver_unregister(&sub->drv);
 132         return 0;
 133 }
 134 EXPORT_SYMBOL(bttv_sub_unregister);
 135
 136 /* ----------------------------------------------------------------------- */
 137 /* external: gpio access functions                                         */
 138
 139 void bttv_gpio_inout(struct bttv_core *core, u32 mask, u32 outbits)
 140 {
 141         struct bttv *btv = container_of(core, struct bttv, c);
 142         unsigned long flags;
 143         u32 data;
 144
 145         spin_lock_irqsave(&btv->gpio_lock,flags);
 146         data = btread(BT848_GPIO_OUT_EN);
 147         data = data & ~mask;
 148         data = data | (mask & outbits);
 149         btwrite(data,BT848_GPIO_OUT_EN);
 150         spin_unlock_irqrestore(&btv->gpio_lock,flags);
 151 }
 152
 153 u32 bttv_gpio_read(struct bttv_core *core)
 154 {
 155         struct bttv *btv = container_of(core, struct bttv, c);
 156         u32 value;
 157
 158         value = btread(BT848_GPIO_DATA);
 159         return value;
 160 }
 161
 162 void bttv_gpio_write(struct bttv_core *core, u32 value)
 163 {
 164         struct bttv *btv = container_of(core, struct bttv, c);
 165
 166         btwrite(value,BT848_GPIO_DATA);
 167 }
 168
 169 void bttv_gpio_bits(struct bttv_core *core, u32 mask, u32 bits)
 170 {
 171         struct bttv *btv = container_of(core, struct bttv, c);
 172         unsigned long flags;
 173         u32 data;
 174
 175         spin_lock_irqsave(&btv->gpio_lock,flags);
 176         data = btread(BT848_GPIO_DATA);
 177         data = data & ~mask;
 178         data = data | (mask & bits);
 179         btwrite(data,BT848_GPIO_DATA);
 180         spin_unlock_irqrestore(&btv->gpio_lock,flags);
 181 }
 182
 183 /*
 184  * Local variables:
 185  * c-basic-offset: 8
 186  * End:
 187  */