1 /* 2 3 bttv-gpio.c -- gpio sub drivers 4 5 sysfs-based sub driver interface for bttv 6 mainly intended 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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 30 31 #include <linux/module.h> 32 #include <linux/init.h> 33 #include <linux/delay.h> 34 #include <linux/device.h> 35 #include <linux/slab.h> 36 #include <asm/io.h> 37 38 #include "bttvp.h" 39 40 /* ----------------------------------------------------------------------- */ 41 /* internal: the bttv "bus" */ 42 43 static int bttv_sub_bus_match(struct device *dev, struct device_driver *drv) 44 { 45 struct bttv_sub_driver *sub = to_bttv_sub_drv(drv); 46 int len = strlen(sub->wanted); 47 48 if (0 == strncmp(dev_name(dev), sub->wanted, len)) 49 return 1; 50 return 0; 51 } 52 53 static int bttv_sub_probe(struct device *dev) 54 { 55 struct bttv_sub_device *sdev = to_bttv_sub_dev(dev); 56 struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver); 57 58 return sub->probe ? sub->probe(sdev) : -ENODEV; 59 } 60 61 static int bttv_sub_remove(struct device *dev) 62 { 63 struct bttv_sub_device *sdev = to_bttv_sub_dev(dev); 64 struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver); 65 66 if (sub->remove) 67 sub->remove(sdev); 68 return 0; 69 } 70 71 struct bus_type bttv_sub_bus_type = { 72 .name = "bttv-sub", 73 .match = &bttv_sub_bus_match, 74 .probe = bttv_sub_probe, 75 .remove = bttv_sub_remove, 76 }; 77 78 static void release_sub_device(struct device *dev) 79 { 80 struct bttv_sub_device *sub = to_bttv_sub_dev(dev); 81 kfree(sub); 82 } 83 84 int bttv_sub_add_device(struct bttv_core *core, char *name) 85 { 86 struct bttv_sub_device *sub; 87 int err; 88 89 sub = kzalloc(sizeof(*sub),GFP_KERNEL); 90 if (NULL == sub) 91 return -ENOMEM; 92 93 sub->core = core; 94 sub->dev.parent = &core->pci->dev; 95 sub->dev.bus = &bttv_sub_bus_type; 96 sub->dev.release = release_sub_device; 97 dev_set_name(&sub->dev, "%s%d", name, core->nr); 98 99 err = device_register(&sub->dev); 100 if (0 != err) { 101 put_device(&sub->dev); 102 return err; 103 } 104 pr_info("%d: add subdevice \"%s\"\n", core->nr, dev_name(&sub->dev)); 105 list_add_tail(&sub->list,&core->subs); 106 return 0; 107 } 108 109 int bttv_sub_del_devices(struct bttv_core *core) 110 { 111 struct bttv_sub_device *sub, *save; 112 113 list_for_each_entry_safe(sub, save, &core->subs, list) { 114 list_del(&sub->list); 115 device_unregister(&sub->dev); 116 } 117 return 0; 118 } 119 120 /* ----------------------------------------------------------------------- */ 121 /* external: sub-driver register/unregister */ 122 123 int 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 } 129 EXPORT_SYMBOL(bttv_sub_register); 130 131 int bttv_sub_unregister(struct bttv_sub_driver *sub) 132 { 133 driver_unregister(&sub->drv); 134 return 0; 135 } 136 EXPORT_SYMBOL(bttv_sub_unregister); 137 138 /* ----------------------------------------------------------------------- */ 139 /* external: gpio access functions */ 140 141 void 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 } 154 155 u32 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 } 163 164 void 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 } 170 171 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