Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) |
Mauro Carvalho Chehab | 4ac9791 | 2005-11-08 21:37:43 -0800 | [diff] [blame] | 10 | & Marcus Metzler (mocm@thp.uni-koeln.de) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 33 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Kay Sievers | af128a1 | 2008-10-30 00:51:46 -0300 | [diff] [blame] | 46 | if (0 == strncmp(dev_name(dev), sub->wanted, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | return 1; |
| 48 | return 0; |
| 49 | } |
| 50 | |
Russell King | 348290a | 2006-01-06 11:42:03 +0000 | [diff] [blame] | 51 | static int bttv_sub_probe(struct device *dev) |
| 52 | { |
| 53 | struct bttv_sub_device *sdev = to_bttv_sub_dev(dev); |
| 54 | struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver); |
| 55 | |
| 56 | return sub->probe ? sub->probe(sdev) : -ENODEV; |
| 57 | } |
| 58 | |
| 59 | static int bttv_sub_remove(struct device *dev) |
| 60 | { |
| 61 | struct bttv_sub_device *sdev = to_bttv_sub_dev(dev); |
| 62 | struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver); |
| 63 | |
| 64 | if (sub->remove) |
| 65 | sub->remove(sdev); |
| 66 | return 0; |
| 67 | } |
| 68 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | struct bus_type bttv_sub_bus_type = { |
Russell King | 348290a | 2006-01-06 11:42:03 +0000 | [diff] [blame] | 70 | .name = "bttv-sub", |
| 71 | .match = &bttv_sub_bus_match, |
| 72 | .probe = bttv_sub_probe, |
| 73 | .remove = bttv_sub_remove, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
| 76 | static void release_sub_device(struct device *dev) |
| 77 | { |
| 78 | struct bttv_sub_device *sub = to_bttv_sub_dev(dev); |
| 79 | kfree(sub); |
| 80 | } |
| 81 | |
| 82 | int bttv_sub_add_device(struct bttv_core *core, char *name) |
| 83 | { |
| 84 | struct bttv_sub_device *sub; |
| 85 | int err; |
| 86 | |
Panagiotis Issaris | 7408187 | 2006-01-11 19:40:56 -0200 | [diff] [blame] | 87 | sub = kzalloc(sizeof(*sub),GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | if (NULL == sub) |
| 89 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
| 91 | sub->core = core; |
| 92 | sub->dev.parent = &core->pci->dev; |
| 93 | sub->dev.bus = &bttv_sub_bus_type; |
| 94 | sub->dev.release = release_sub_device; |
Kay Sievers | af128a1 | 2008-10-30 00:51:46 -0300 | [diff] [blame] | 95 | dev_set_name(&sub->dev, "%s%d", name, core->nr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
| 97 | err = device_register(&sub->dev); |
| 98 | if (0 != err) { |
| 99 | kfree(sub); |
| 100 | return err; |
| 101 | } |
Kay Sievers | af128a1 | 2008-10-30 00:51:46 -0300 | [diff] [blame] | 102 | printk("bttv%d: add subdevice \"%s\"\n", core->nr, dev_name(&sub->dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | list_add_tail(&sub->list,&core->subs); |
| 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | int bttv_sub_del_devices(struct bttv_core *core) |
| 108 | { |
Trent Piepho | a991f44 | 2007-10-10 05:37:43 -0300 | [diff] [blame] | 109 | struct bttv_sub_device *sub, *save; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
Trent Piepho | a991f44 | 2007-10-10 05:37:43 -0300 | [diff] [blame] | 111 | list_for_each_entry_safe(sub, save, &core->subs, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | list_del(&sub->list); |
| 113 | device_unregister(&sub->dev); |
| 114 | } |
| 115 | return 0; |
| 116 | } |
| 117 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
| 183 | /* |
| 184 | * Local variables: |
| 185 | * c-basic-offset: 8 |
| 186 | * End: |
| 187 | */ |