drivers/media/video/bttv-gpio.c

   1 /*
   2     $Id: bttv-gpio.c,v 1.7 2005/02/16 12:14:10 kraxel Exp $
   3
   4     bttv-gpio.c  --  gpio sub drivers
   5
   6     sysfs-based sub driver interface for bttv
   7     mainly intented for gpio access
   8
   9
  10     Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
  11                            & Marcus Metzler (mocm@thp.uni-koeln.de)
  12     (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
  13
  14     This program is free software; you can redistribute it and/or modify
  15     it under the terms of the GNU General Public License as published by
  16     the Free Software Foundation; either version 2 of the License, or
  17     (at your option) any later version.
  18
  19     This program is distributed in the hope that it will be useful,
  20     but WITHOUT ANY WARRANTY; without even the implied warranty of
  21     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22     GNU General Public License for more details.
  23
  24     You should have received a copy of the GNU General Public License
  25     along with this program; if not, write to the Free Software
  26     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  27
  28 */
  29
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/delay.h>
  33 #include <linux/device.h>
  34 #include <asm/io.h>
  35
  36 #include "bttvp.h"
  37
  38 /* ----------------------------------------------------------------------- */
  39 /* internal: the bttv "bus"                                                */
  40
  41 static int bttv_sub_bus_match(struct device *dev, struct device_driver *drv)
  42 {
  43         struct bttv_sub_driver *sub = to_bttv_sub_drv(drv);
  44         int len = strlen(sub->wanted);
  45
  46         if (0 == strncmp(dev->bus_id, sub->wanted, len))
  47                 return 1;
  48         return 0;
  49 }
  50
  51 struct bus_type bttv_sub_bus_type = {
  52         .name  = "bttv-sub",
  53         .match = &bttv_sub_bus_match,
  54 };
  55 EXPORT_SYMBOL(bttv_sub_bus_type);
  56
  57 static void release_sub_device(struct device *dev)
  58 {
  59         struct bttv_sub_device *sub = to_bttv_sub_dev(dev);
  60         kfree(sub);
  61 }
  62
  63 int bttv_sub_add_device(struct bttv_core *core, char *name)
  64 {
  65         struct bttv_sub_device *sub;
  66         int err;
  67
  68         sub = kmalloc(sizeof(*sub),GFP_KERNEL);
  69         if (NULL == sub)
  70                 return -ENOMEM;
  71         memset(sub,0,sizeof(*sub));
  72
  73         sub->core        = core;
  74         sub->dev.parent  = &core->pci->dev;
  75         sub->dev.bus     = &bttv_sub_bus_type;
  76         sub->dev.release = release_sub_device;
  77         snprintf(sub->dev.bus_id,sizeof(sub->dev.bus_id),"%s%d",
  78                  name, core->nr);
  79
  80         err = device_register(&sub->dev);
  81         if (0 != err) {
  82                 kfree(sub);
  83                 return err;
  84         }
  85         printk("bttv%d: add subdevice \"%s\"\n", core->nr, sub->dev.bus_id);
  86         list_add_tail(&sub->list,&core->subs);
  87         return 0;
  88 }
  89
  90 int bttv_sub_del_devices(struct bttv_core *core)
  91 {
  92         struct bttv_sub_device *sub;
  93         struct list_head *item,*save;
  94
  95         list_for_each_safe(item,save,&core->subs) {
  96                 sub = list_entry(item,struct bttv_sub_device,list);
  97                 list_del(&sub->list);
  98                 device_unregister(&sub->dev);
  99         }
 100         return 0;
 101 }
 102
 103 void bttv_gpio_irq(struct bttv_core *core)
 104 {
 105         struct bttv_sub_driver *drv;
 106         struct bttv_sub_device *dev;
 107         struct list_head *item;
 108
 109         list_for_each(item,&core->subs) {
 110                 dev = list_entry(item,struct bttv_sub_device,list);
 111                 drv = to_bttv_sub_drv(dev->dev.driver);
 112                 if (drv && drv->gpio_irq)
 113                         drv->gpio_irq(dev);
 114         }
 115 }
 116
 117 /* ----------------------------------------------------------------------- */
 118 /* external: sub-driver register/unregister                                */
 119
 120 int bttv_sub_register(struct bttv_sub_driver *sub, char *wanted)
 121 {
 122         sub->drv.bus = &bttv_sub_bus_type;
 123         snprintf(sub->wanted,sizeof(sub->wanted),"%s",wanted);
 124         return driver_register(&sub->drv);
 125 }
 126 EXPORT_SYMBOL(bttv_sub_register);
 127
 128 int bttv_sub_unregister(struct bttv_sub_driver *sub)
 129 {
 130         driver_unregister(&sub->drv);
 131         return 0;
 132 }
 133 EXPORT_SYMBOL(bttv_sub_unregister);
 134
 135 /* ----------------------------------------------------------------------- */
 136 /* external: gpio access functions                                         */
 137
 138 void bttv_gpio_inout(struct bttv_core *core, u32 mask, u32 outbits)
 139 {
 140         struct bttv *btv = container_of(core, struct bttv, c);
 141         unsigned long flags;
 142         u32 data;
 143
 144         spin_lock_irqsave(&btv->gpio_lock,flags);
 145         data = btread(BT848_GPIO_OUT_EN);
 146         data = data & ~mask;
 147         data = data | (mask & outbits);
 148         btwrite(data,BT848_GPIO_OUT_EN);
 149         spin_unlock_irqrestore(&btv->gpio_lock,flags);
 150 }
 151 EXPORT_SYMBOL(bttv_gpio_inout);
 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 EXPORT_SYMBOL(bttv_gpio_read);
 162
 163 void bttv_gpio_write(struct bttv_core *core, u32 value)
 164 {
 165         struct bttv *btv = container_of(core, struct bttv, c);
 166
 167         btwrite(value,BT848_GPIO_DATA);
 168 }
 169 EXPORT_SYMBOL(bttv_gpio_write);
 170
 171 void bttv_gpio_bits(struct bttv_core *core, u32 mask, u32 bits)
 172 {
 173         struct bttv *btv = container_of(core, struct bttv, c);
 174         unsigned long flags;
 175         u32 data;
 176
 177         spin_lock_irqsave(&btv->gpio_lock,flags);
 178         data = btread(BT848_GPIO_DATA);
 179         data = data & ~mask;
 180         data = data | (mask & bits);
 181         btwrite(data,BT848_GPIO_DATA);
 182         spin_unlock_irqrestore(&btv->gpio_lock,flags);
 183 }
 184 EXPORT_SYMBOL(bttv_gpio_bits);
 185
 186 /*
 187  * Local variables:
 188  * c-basic-offset: 8
 189  * End:
 190  */