drivers/media/video/bttv-gpio.c

   1 /*
   2     bttv-gpio.c  --  gpio sub drivers
   3
   4     sysfs-based sub driver interface for bttv
   5     mainly intented for gpio access
   6
   7
   8     Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
   9                            & Marcus Metzler (mocm@thp.uni-koeln.de)
  10     (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
  11
  12     This program is free software; you can redistribute it and/or modify
  13     it under the terms of the GNU General Public License as published by
  14     the Free Software Foundation; either version 2 of the License, or
  15     (at your option) any later version.
  16
  17     This program is distributed in the hope that it will be useful,
  18     but WITHOUT ANY WARRANTY; without even the implied warranty of
  19     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20     GNU General Public License for more details.
  21
  22     You should have received a copy of the GNU General Public License
  23     along with this program; if not, write to the Free Software
  24     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25
  26 */
  27
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/delay.h>
  31 #include <linux/device.h>
  32 #include <asm/io.h>
  33
  34 #include "bttvp.h"
  35
  36 /* ----------------------------------------------------------------------- */
  37 /* internal: the bttv "bus"                                                */
  38
  39 static int bttv_sub_bus_match(struct device *dev, struct device_driver *drv)
  40 {
  41         struct bttv_sub_driver *sub = to_bttv_sub_drv(drv);
  42         int len = strlen(sub->wanted);
  43
  44         if (0 == strncmp(dev->bus_id, sub->wanted, len))
  45                 return 1;
  46         return 0;
  47 }
  48
  49 struct bus_type bttv_sub_bus_type = {
  50         .name  = "bttv-sub",
  51         .match = &bttv_sub_bus_match,
  52 };
  53 EXPORT_SYMBOL(bttv_sub_bus_type);
  54
  55 static void release_sub_device(struct device *dev)
  56 {
  57         struct bttv_sub_device *sub = to_bttv_sub_dev(dev);
  58         kfree(sub);
  59 }
  60
  61 int bttv_sub_add_device(struct bttv_core *core, char *name)
  62 {
  63         struct bttv_sub_device *sub;
  64
  65         sub = kmalloc(sizeof(*sub),GFP_KERNEL);
  66         if (NULL == sub)
  67                 return -ENOMEM;
  68         memset(sub,0,sizeof(*sub));
  69
  70         sub->core        = core;
  71         sub->dev.parent  = &core->pci->dev;
  72         sub->dev.bus     = &bttv_sub_bus_type;
  73         sub->dev.release = release_sub_device;
  74         snprintf(sub->dev.bus_id,sizeof(sub->dev.bus_id),"%s%d",
  75                  name, core->nr);
  76
  77         printk("bttv%d: add subdevice \"%s\"\n", core->nr, sub->dev.bus_id);
  78         list_add_tail(&sub->list,&core->subs);
  79         device_register(&sub->dev);
  80         return 0;
  81 }
  82
  83 int bttv_sub_del_devices(struct bttv_core *core)
  84 {
  85         struct bttv_sub_device *sub;
  86         struct list_head *item,*save;
  87
  88         list_for_each_safe(item,save,&core->subs) {
  89                 sub = list_entry(item,struct bttv_sub_device,list);
  90                 device_unregister(&sub->dev);
  91         }
  92         return 0;
  93 }
  94
  95 void bttv_gpio_irq(struct bttv_core *core)
  96 {
  97         struct bttv_sub_driver *drv;
  98         struct bttv_sub_device *dev;
  99         struct list_head *item;
 100
 101         list_for_each(item,&core->subs) {
 102                 dev = list_entry(item,struct bttv_sub_device,list);
 103                 drv = to_bttv_sub_drv(dev->dev.driver);
 104                 if (drv && drv->gpio_irq)
 105                         drv->gpio_irq(dev);
 106         }
 107 }
 108
 109 void bttv_i2c_info(struct bttv_core *core, struct i2c_client *client, int attach)
 110 {
 111         struct bttv_sub_driver *drv;
 112         struct bttv_sub_device *dev;
 113         struct list_head *item;
 114
 115         list_for_each(item,&core->subs) {
 116                 dev = list_entry(item,struct bttv_sub_device,list);
 117                 drv = to_bttv_sub_drv(dev->dev.driver);
 118                 if (drv && drv->i2c_info)
 119                         drv->i2c_info(dev,client,attach);
 120         }
 121 }
 122
 123 /* ----------------------------------------------------------------------- */
 124 /* external: sub-driver register/unregister                                */
 125
 126 int bttv_sub_register(struct bttv_sub_driver *sub, char *wanted)
 127 {
 128         sub->drv.bus = &bttv_sub_bus_type;
 129         snprintf(sub->wanted,sizeof(sub->wanted),"%s",wanted);
 130         driver_register(&sub->drv);
 131         return 0;
 132 }
 133 EXPORT_SYMBOL(bttv_sub_register);
 134
 135 int bttv_sub_unregister(struct bttv_sub_driver *sub)
 136 {
 137         driver_unregister(&sub->drv);
 138         return 0;
 139 }
 140 EXPORT_SYMBOL(bttv_sub_unregister);
 141
 142 /* ----------------------------------------------------------------------- */
 143 /* external: gpio access functions                                         */
 144
 145 void bttv_gpio_inout(struct bttv_core *core, u32 mask, u32 outbits)
 146 {
 147         struct bttv *btv = container_of(core, struct bttv, c);
 148         unsigned long flags;
 149         u32 data;
 150
 151         spin_lock_irqsave(&btv->gpio_lock,flags);
 152         data = btread(BT848_GPIO_OUT_EN);
 153         data = data & ~mask;
 154         data = data | (mask & outbits);
 155         btwrite(data,BT848_GPIO_OUT_EN);
 156         spin_unlock_irqrestore(&btv->gpio_lock,flags);
 157 }
 158 EXPORT_SYMBOL(bttv_gpio_inout);
 159
 160 u32 bttv_gpio_read(struct bttv_core *core)
 161 {
 162         struct bttv *btv = container_of(core, struct bttv, c);
 163         u32 value;
 164
 165         value = btread(BT848_GPIO_DATA);
 166         return value;
 167 }
 168 EXPORT_SYMBOL(bttv_gpio_read);
 169
 170 void bttv_gpio_write(struct bttv_core *core, u32 value)
 171 {
 172         struct bttv *btv = container_of(core, struct bttv, c);
 173
 174         btwrite(value,BT848_GPIO_DATA);
 175 }
 176 EXPORT_SYMBOL(bttv_gpio_write);
 177
 178 void bttv_gpio_bits(struct bttv_core *core, u32 mask, u32 bits)
 179 {
 180         struct bttv *btv = container_of(core, struct bttv, c);
 181         unsigned long flags;
 182         u32 data;
 183
 184         spin_lock_irqsave(&btv->gpio_lock,flags);
 185         data = btread(BT848_GPIO_DATA);
 186         data = data & ~mask;
 187         data = data | (mask & bits);
 188         btwrite(data,BT848_GPIO_DATA);
 189         spin_unlock_irqrestore(&btv->gpio_lock,flags);
 190 }
 191 EXPORT_SYMBOL(bttv_gpio_bits);
 192
 193 /*
 194  * Local variables:
 195  * c-basic-offset: 8
 196  * End:
 197  */