drivers/media/video/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 struct bus_type bttv_sub_bus_type = {
  51         .name  = "bttv-sub",
  52         .match = &bttv_sub_bus_match,
  53 };
  54 EXPORT_SYMBOL(bttv_sub_bus_type);
  55
  56 static void release_sub_device(struct device *dev)
  57 {
  58         struct bttv_sub_device *sub = to_bttv_sub_dev(dev);
  59         kfree(sub);
  60 }
  61
  62 int bttv_sub_add_device(struct bttv_core *core, char *name)
  63 {
  64         struct bttv_sub_device *sub;
  65         int err;
  66
  67         sub = kmalloc(sizeof(*sub),GFP_KERNEL);
  68         if (NULL == sub)
  69                 return -ENOMEM;
  70         memset(sub,0,sizeof(*sub));
  71
  72         sub->core        = core;
  73         sub->dev.parent  = &core->pci->dev;
  74         sub->dev.bus     = &bttv_sub_bus_type;
  75         sub->dev.release = release_sub_device;
  76         snprintf(sub->dev.bus_id,sizeof(sub->dev.bus_id),"%s%d",
  77                  name, core->nr);
  78
  79         err = device_register(&sub->dev);
  80         if (0 != err) {
  81                 kfree(sub);
  82                 return err;
  83         }
  84         printk("bttv%d: add subdevice \"%s\"\n", core->nr, sub->dev.bus_id);
  85         list_add_tail(&sub->list,&core->subs);
  86         return 0;
  87 }
  88
  89 int bttv_sub_del_devices(struct bttv_core *core)
  90 {
  91         struct bttv_sub_device *sub;
  92         struct list_head *item,*save;
  93
  94         list_for_each_safe(item,save,&core->subs) {
  95                 sub = list_entry(item,struct bttv_sub_device,list);
  96                 list_del(&sub->list);
  97                 device_unregister(&sub->dev);
  98         }
  99         return 0;
 100 }
 101
 102 void bttv_gpio_irq(struct bttv_core *core)
 103 {
 104         struct bttv_sub_driver *drv;
 105         struct bttv_sub_device *dev;
 106         struct list_head *item;
 107
 108         list_for_each(item,&core->subs) {
 109                 dev = list_entry(item,struct bttv_sub_device,list);
 110                 drv = to_bttv_sub_drv(dev->dev.driver);
 111                 if (drv && drv->gpio_irq)
 112                         drv->gpio_irq(dev);
 113         }
 114 }
 115
 116 int bttv_any_irq(struct bttv_core *core)
 117 {
 118         struct bttv_sub_driver *drv;
 119         struct bttv_sub_device *dev;
 120         struct list_head *item;
 121         int handled = 0;
 122
 123         list_for_each(item,&core->subs) {
 124                 dev = list_entry(item,struct bttv_sub_device,list);
 125                 drv = to_bttv_sub_drv(dev->dev.driver);
 126                 if (drv && drv->any_irq) {
 127                         if (drv->any_irq(dev))
 128                                 handled = 1;
 129                 }
 130         }
 131         return handled;
 132 }
 133
 134 /* ----------------------------------------------------------------------- */
 135 /* external: sub-driver register/unregister                                */
 136
 137 int bttv_sub_register(struct bttv_sub_driver *sub, char *wanted)
 138 {
 139         sub->drv.bus = &bttv_sub_bus_type;
 140         snprintf(sub->wanted,sizeof(sub->wanted),"%s",wanted);
 141         return driver_register(&sub->drv);
 142 }
 143 EXPORT_SYMBOL(bttv_sub_register);
 144
 145 int bttv_sub_unregister(struct bttv_sub_driver *sub)
 146 {
 147         driver_unregister(&sub->drv);
 148         return 0;
 149 }
 150 EXPORT_SYMBOL(bttv_sub_unregister);
 151
 152 /* ----------------------------------------------------------------------- */
 153 /* external: gpio access functions                                         */
 154
 155 void bttv_gpio_inout(struct bttv_core *core, u32 mask, u32 outbits)
 156 {
 157         struct bttv *btv = container_of(core, struct bttv, c);
 158         unsigned long flags;
 159         u32 data;
 160
 161         spin_lock_irqsave(&btv->gpio_lock,flags);
 162         data = btread(BT848_GPIO_OUT_EN);
 163         data = data & ~mask;
 164         data = data | (mask & outbits);
 165         btwrite(data,BT848_GPIO_OUT_EN);
 166         spin_unlock_irqrestore(&btv->gpio_lock,flags);
 167 }
 168 EXPORT_SYMBOL(bttv_gpio_inout);
 169
 170 u32 bttv_gpio_read(struct bttv_core *core)
 171 {
 172         struct bttv *btv = container_of(core, struct bttv, c);
 173         u32 value;
 174
 175         value = btread(BT848_GPIO_DATA);
 176         return value;
 177 }
 178 EXPORT_SYMBOL(bttv_gpio_read);
 179
 180 void bttv_gpio_write(struct bttv_core *core, u32 value)
 181 {
 182         struct bttv *btv = container_of(core, struct bttv, c);
 183
 184         btwrite(value,BT848_GPIO_DATA);
 185 }
 186 EXPORT_SYMBOL(bttv_gpio_write);
 187
 188 void bttv_gpio_bits(struct bttv_core *core, u32 mask, u32 bits)
 189 {
 190         struct bttv *btv = container_of(core, struct bttv, c);
 191         unsigned long flags;
 192         u32 data;
 193
 194         spin_lock_irqsave(&btv->gpio_lock,flags);
 195         data = btread(BT848_GPIO_DATA);
 196         data = data & ~mask;
 197         data = data | (mask & bits);
 198         btwrite(data,BT848_GPIO_DATA);
 199         spin_unlock_irqrestore(&btv->gpio_lock,flags);
 200 }
 201 EXPORT_SYMBOL(bttv_gpio_bits);
 202
 203 /*
 204  * Local variables:
 205  * c-basic-offset: 8
 206  * End:
 207  */