bttv-gpio.c revision 3bfb7398e2554fb54acb2900b81de144eb41c3ac
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 40static 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 50static 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 58static 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 68struct 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 75static void release_sub_device(struct device *dev) 76{ 77 struct bttv_sub_device *sub = to_bttv_sub_dev(dev); 78 kfree(sub); 79} 80 81int 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 107int bttv_sub_del_devices(struct bttv_core *core) 108{ 109 struct bttv_sub_device *sub; 110 struct list_head *item,*save; 111 112 list_for_each_safe(item,save,&core->subs) { 113 sub = list_entry(item,struct bttv_sub_device,list); 114 list_del(&sub->list); 115 device_unregister(&sub->dev); 116 } 117 return 0; 118} 119 120/* ----------------------------------------------------------------------- */ 121/* external: sub-driver register/unregister */ 122 123int bttv_sub_register(struct bttv_sub_driver *sub, char *wanted) 124{ 125 sub->drv.bus = &bttv_sub_bus_type; 126 snprintf(sub->wanted,sizeof(sub->wanted),"%s",wanted); 127 return driver_register(&sub->drv); 128} 129EXPORT_SYMBOL(bttv_sub_register); 130 131int bttv_sub_unregister(struct bttv_sub_driver *sub) 132{ 133 driver_unregister(&sub->drv); 134 return 0; 135} 136EXPORT_SYMBOL(bttv_sub_unregister); 137 138/* ----------------------------------------------------------------------- */ 139/* external: gpio access functions */ 140 141void bttv_gpio_inout(struct bttv_core *core, u32 mask, u32 outbits) 142{ 143 struct bttv *btv = container_of(core, struct bttv, c); 144 unsigned long flags; 145 u32 data; 146 147 spin_lock_irqsave(&btv->gpio_lock,flags); 148 data = btread(BT848_GPIO_OUT_EN); 149 data = data & ~mask; 150 data = data | (mask & outbits); 151 btwrite(data,BT848_GPIO_OUT_EN); 152 spin_unlock_irqrestore(&btv->gpio_lock,flags); 153} 154 155u32 bttv_gpio_read(struct bttv_core *core) 156{ 157 struct bttv *btv = container_of(core, struct bttv, c); 158 u32 value; 159 160 value = btread(BT848_GPIO_DATA); 161 return value; 162} 163 164void bttv_gpio_write(struct bttv_core *core, u32 value) 165{ 166 struct bttv *btv = container_of(core, struct bttv, c); 167 168 btwrite(value,BT848_GPIO_DATA); 169} 170 171void 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} 184 185/* 186 * Local variables: 187 * c-basic-offset: 8 188 * End: 189 */ 190