summaryrefslogtreecommitdiffstats
path: root/drivers/media/pci/bt8xx/bttv-gpio.c
blob: a2b18e2bed1b0bc00669a75936a0756953fb9a4d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
// SPDX-License-Identifier: GPL-2.0-or-later
/*

    bttv-gpio.c  --  gpio sub drivers

    sysfs-based sub driver interface for bttv
    mainly intended for gpio access


    Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
			   & Marcus Metzler (mocm@thp.uni-koeln.de)
    (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>


*/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <asm/io.h>

#include "bttvp.h"

/* ----------------------------------------------------------------------- */
/* internal: the bttv "bus"                                                */

static int bttv_sub_bus_match(struct device *dev, struct device_driver *drv)
{
	struct bttv_sub_driver *sub = to_bttv_sub_drv(drv);
	int len = strlen(sub->wanted);

	if (0 == strncmp(dev_name(dev), sub->wanted, len))
		return 1;
	return 0;
}

static int bttv_sub_probe(struct device *dev)
{
	struct bttv_sub_device *sdev = to_bttv_sub_dev(dev);
	struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver);

	return sub->probe ? sub->probe(sdev) : -ENODEV;
}

static void bttv_sub_remove(struct device *dev)
{
	struct bttv_sub_device *sdev = to_bttv_sub_dev(dev);
	struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver);

	if (sub->remove)
		sub->remove(sdev);
}

struct bus_type bttv_sub_bus_type = {
	.name   = "bttv-sub",
	.match  = &bttv_sub_bus_match,
	.probe  = bttv_sub_probe,
	.remove = bttv_sub_remove,
};

static void release_sub_device(struct device *dev)
{
	struct bttv_sub_device *sub = to_bttv_sub_dev(dev);
	kfree(sub);
}

int bttv_sub_add_device(struct bttv_core *core, char *name)
{
	struct bttv_sub_device *sub;
	int err;

	sub = kzalloc(sizeof(*sub),GFP_KERNEL);
	if (NULL == sub)
		return -ENOMEM;

	sub->core        = core;
	sub->dev.parent  = &core->pci->dev;
	sub->dev.bus     = &bttv_sub_bus_type;
	sub->dev.release = release_sub_device;
	dev_set_name(&sub->dev, "%s%d", name, core->nr);

	err = device_register(&sub->dev);
	if (0 != err) {
		put_device(&sub->dev);
		return err;
	}
	pr_info("%d: add subdevice \"%s\"\n", core->nr, dev_name(&sub->dev));
	list_add_tail(&sub->list,&core->subs);
	return 0;
}

int bttv_sub_del_devices(struct bttv_core *core)
{
	struct bttv_sub_device *sub, *save;

	list_for_each_entry_safe(sub, save, &core->subs, list) {
		list_del(&sub->list);
		device_unregister(&sub->dev);
	}
	return 0;
}

/* ----------------------------------------------------------------------- */
/* external: sub-driver register/unregister                                */

int bttv_sub_register(struct bttv_sub_driver *sub, char *wanted)
{
	sub->drv.bus = &bttv_sub_bus_type;
	snprintf(sub->wanted,sizeof(sub->wanted),"%s",wanted);
	return driver_register(&sub->drv);
}
EXPORT_SYMBOL(bttv_sub_register);

int bttv_sub_unregister(struct bttv_sub_driver *sub)
{
	driver_unregister(&sub->drv);
	return 0;
}
EXPORT_SYMBOL(bttv_sub_unregister);

/* ----------------------------------------------------------------------- */
/* external: gpio access functions                                         */

void bttv_gpio_inout(struct bttv_core *core, u32 mask, u32 outbits)
{
	struct bttv *btv = container_of(core, struct bttv, c);
	unsigned long flags;
	u32 data;

	spin_lock_irqsave(&btv->gpio_lock,flags);
	data = btread(BT848_GPIO_OUT_EN);
	data = data & ~mask;
	data = data | (mask & outbits);
	btwrite(data,BT848_GPIO_OUT_EN);
	spin_unlock_irqrestore(&btv->gpio_lock,flags);
}

u32 bttv_gpio_read(struct bttv_core *core)
{
	struct bttv *btv = container_of(core, struct bttv, c);
	u32 value;

	value = btread(BT848_GPIO_DATA);
	return value;
}

void bttv_gpio_write(struct bttv_core *core, u32 value)
{
	struct bttv *btv = container_of(core, struct bttv, c);

	btwrite(value,BT848_GPIO_DATA);
}

void bttv_gpio_bits(struct bttv_core *core, u32 mask, u32 bits)
{
	struct bttv *btv = container_of(core, struct bttv, c);
	unsigned long flags;
	u32 data;

	spin_lock_irqsave(&btv->gpio_lock,flags);
	data = btread(BT848_GPIO_DATA);
	data = data & ~mask;
	data = data | (mask & bits);
	btwrite(data,BT848_GPIO_DATA);
	spin_unlock_irqrestore(&btv->gpio_lock,flags);
}