summaryrefslogtreecommitdiffstats
path: root/drivers/video/matrox/i2c-matroxfb.c
blob: 5ec718a5fe2257c093ccaf74f550ba9100bf4c27 (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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
/*
 *
 * Hardware accelerated Matrox Millennium I, II, Mystique, G100, G200, G400 and G450.
 *
 * (c) 1998-2002 Petr Vandrovec <vandrove@vc.cvut.cz>
 *
 * Version: 1.64 2002/06/10
 *
 * See matroxfb_base.c for contributors.
 *
 */

#include "matroxfb_base.h"
#include "matroxfb_maven.h"
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>

/* MGA-TVO I2C for G200, G400 */
#define MAT_CLK		0x20
#define MAT_DATA	0x10
/* primary head DDC for Mystique(?), G100, G200, G400 */
#define DDC1_CLK	0x08
#define DDC1_DATA	0x02
/* primary head DDC for Millennium, Millennium II */
#define DDC1B_CLK	0x10
#define DDC1B_DATA	0x04
/* secondary head DDC for G400 */
#define DDC2_CLK	0x04
#define DDC2_DATA	0x01

/******************************************************/

struct matroxfb_dh_maven_info {
	struct i2c_bit_adapter	maven;
	struct i2c_bit_adapter	ddc1;
	struct i2c_bit_adapter	ddc2;
};

static int matroxfb_read_gpio(struct matrox_fb_info* minfo) {
	unsigned long flags;
	int v;

	matroxfb_DAC_lock_irqsave(flags);
	v = matroxfb_DAC_in(PMINFO DAC_XGENIODATA);
	matroxfb_DAC_unlock_irqrestore(flags);
	return v;
}

static void matroxfb_set_gpio(struct matrox_fb_info* minfo, int mask, int val) {
	unsigned long flags;
	int v;

	matroxfb_DAC_lock_irqsave(flags);
	v = (matroxfb_DAC_in(PMINFO DAC_XGENIOCTRL) & mask) | val;
	matroxfb_DAC_out(PMINFO DAC_XGENIOCTRL, v);
	/* We must reset GENIODATA very often... XFree plays with this register */
	matroxfb_DAC_out(PMINFO DAC_XGENIODATA, 0x00);
	matroxfb_DAC_unlock_irqrestore(flags);
}

/* software I2C functions */
static inline void matroxfb_i2c_set(struct matrox_fb_info* minfo, int mask, int state) {
	if (state)
		state = 0;
	else
		state = mask;
	matroxfb_set_gpio(minfo, ~mask, state);
}

static void matroxfb_gpio_setsda(void* data, int state) {
	struct i2c_bit_adapter* b = data;
	matroxfb_i2c_set(b->minfo, b->mask.data, state);
}

static void matroxfb_gpio_setscl(void* data, int state) {
	struct i2c_bit_adapter* b = data;
	matroxfb_i2c_set(b->minfo, b->mask.clock, state);
}

static int matroxfb_gpio_getsda(void* data) {
	struct i2c_bit_adapter* b = data;
	return (matroxfb_read_gpio(b->minfo) & b->mask.data) ? 1 : 0;
}

static int matroxfb_gpio_getscl(void* data) {
	struct i2c_bit_adapter* b = data;
	return (matroxfb_read_gpio(b->minfo) & b->mask.clock) ? 1 : 0;
}

static struct i2c_adapter matrox_i2c_adapter_template =
{
	.owner =	THIS_MODULE,
	.id =		I2C_HW_B_G400,
};

static struct i2c_algo_bit_data matrox_i2c_algo_template =
{
	.setsda		= matroxfb_gpio_setsda,
	.setscl		= matroxfb_gpio_setscl,
	.getsda		= matroxfb_gpio_getsda,
	.getscl		= matroxfb_gpio_getscl,
	.udelay		= 10,
	.timeout	= 100,
};

static int i2c_bus_reg(struct i2c_bit_adapter* b, struct matrox_fb_info* minfo, 
		unsigned int data, unsigned int clock, const char* name) {
	int err;

	b->minfo = minfo;
	b->mask.data = data;
	b->mask.clock = clock;
	b->adapter = matrox_i2c_adapter_template;
	snprintf(b->adapter.name, I2C_NAME_SIZE, name,
		minfo->fbcon.node);
	i2c_set_adapdata(&b->adapter, b);
	b->adapter.algo_data = &b->bac;
	b->adapter.dev.parent = &ACCESS_FBINFO(pcidev)->dev;
	b->bac = matrox_i2c_algo_template;
	b->bac.data = b;
	err = i2c_bit_add_bus(&b->adapter);
	b->initialized = !err;
	return err;
}

static void i2c_bit_bus_del(struct i2c_bit_adapter* b) {
	if (b->initialized) {
		i2c_del_adapter(&b->adapter);
		b->initialized = 0;
	}
}

static inline void i2c_maven_done(struct matroxfb_dh_maven_info* minfo2) {
	i2c_bit_bus_del(&minfo2->maven);
}

static inline void i2c_ddc1_done(struct matroxfb_dh_maven_info* minfo2) {
	i2c_bit_bus_del(&minfo2->ddc1);
}

static inline void i2c_ddc2_done(struct matroxfb_dh_maven_info* minfo2) {
	i2c_bit_bus_del(&minfo2->ddc2);
}

static void* i2c_matroxfb_probe(struct matrox_fb_info* minfo) {
	int err;
	unsigned long flags;
	struct matroxfb_dh_maven_info* m2info;

	m2info = kzalloc(sizeof(*m2info), GFP_KERNEL);
	if (!m2info)
		return NULL;

	matroxfb_DAC_lock_irqsave(flags);
	matroxfb_DAC_out(PMINFO DAC_XGENIODATA, 0xFF);
	matroxfb_DAC_out(PMINFO DAC_XGENIOCTRL, 0x00);
	matroxfb_DAC_unlock_irqrestore(flags);

	switch (ACCESS_FBINFO(chip)) {
		case MGA_2064:
		case MGA_2164:
			err = i2c_bus_reg(&m2info->ddc1, minfo, DDC1B_DATA, DDC1B_CLK, "DDC:fb%u #0");
			break;
		default:
			err = i2c_bus_reg(&m2info->ddc1, minfo, DDC1_DATA, DDC1_CLK, "DDC:fb%u #0");
			break;
	}
	if (err)
		goto fail_ddc1;
	if (ACCESS_FBINFO(devflags.dualhead)) {
		err = i2c_bus_reg(&m2info->ddc2, minfo, DDC2_DATA, DDC2_CLK, "DDC:fb%u #1");
		if (err == -ENODEV) {
			printk(KERN_INFO "i2c-matroxfb: VGA->TV plug detected, DDC unavailable.\n");
		} else if (err)
			printk(KERN_INFO "i2c-matroxfb: Could not register secondary output i2c bus. Continuing anyway.\n");
		/* Register maven bus even on G450/G550 */
		err = i2c_bus_reg(&m2info->maven, minfo, MAT_DATA, MAT_CLK, "MAVEN:fb%u");
		if (err)
			printk(KERN_INFO "i2c-matroxfb: Could not register Maven i2c bus. Continuing anyway.\n");
	}
	return m2info;
fail_ddc1:;
	kfree(m2info);
	printk(KERN_ERR "i2c-matroxfb: Could not register primary adapter DDC bus.\n");
	return NULL;
}

static void i2c_matroxfb_remove(struct matrox_fb_info* minfo, void* data) {
	struct matroxfb_dh_maven_info* m2info = data;

	i2c_maven_done(m2info);
	i2c_ddc2_done(m2info);
	i2c_ddc1_done(m2info);
	kfree(m2info);
}

static struct matroxfb_driver i2c_matroxfb = {
	.node =		LIST_HEAD_INIT(i2c_matroxfb.node),
	.name =		"i2c-matroxfb",
	.probe = 	i2c_matroxfb_probe,
	.remove =	i2c_matroxfb_remove,
};

static int __init i2c_matroxfb_init(void) {
	if (matroxfb_register_driver(&i2c_matroxfb)) {
		printk(KERN_ERR "i2c-matroxfb: failed to register driver\n");
		return -ENXIO;
	}
	return 0;
}

static void __exit i2c_matroxfb_exit(void) {
	matroxfb_unregister_driver(&i2c_matroxfb);
}

MODULE_AUTHOR("(c) 1999-2002 Petr Vandrovec <vandrove@vc.cvut.cz>");
MODULE_DESCRIPTION("Support module providing I2C buses present on Matrox videocards");

module_init(i2c_matroxfb_init);
module_exit(i2c_matroxfb_exit);
/* no __setup required */
MODULE_LICENSE("GPL");