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
bttv_sub_bus_match(struct device * dev,struct device_driver * drv)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
bttv_sub_probe(struct device * dev)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
bttv_sub_remove(struct device * dev)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
release_sub_device(struct device * dev)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
bttv_sub_add_device(struct bttv_core * core,char * name)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
bttv_sub_del_devices(struct bttv_core * core)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
bttv_sub_register(struct bttv_sub_driver * sub,char * wanted)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
bttv_sub_unregister(struct bttv_sub_driver * sub)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
bttv_gpio_inout(struct bttv_core * core,u32 mask,u32 outbits)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
bttv_gpio_read(struct bttv_core * core)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
bttv_gpio_write(struct bttv_core * core,u32 value)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
bttv_gpio_bits(struct bttv_core * core,u32 mask,u32 bits)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