aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/video/fbdev/matrox/i2c-matroxfb.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/video/fbdev/matrox/i2c-matroxfb.c')
-rw-r--r--drivers/video/fbdev/matrox/i2c-matroxfb.c238
1 files changed, 238 insertions, 0 deletions
diff --git a/drivers/video/fbdev/matrox/i2c-matroxfb.c b/drivers/video/fbdev/matrox/i2c-matroxfb.c
new file mode 100644
index 000000000000..0fb280ead3dc
--- /dev/null
+++ b/drivers/video/fbdev/matrox/i2c-matroxfb.c
@@ -0,0 +1,238 @@
1/*
2 *
3 * Hardware accelerated Matrox Millennium I, II, Mystique, G100, G200, G400 and G450.
4 *
5 * (c) 1998-2002 Petr Vandrovec <vandrove@vc.cvut.cz>
6 *
7 * Version: 1.64 2002/06/10
8 *
9 * See matroxfb_base.c for contributors.
10 *
11 */
12
13#include "matroxfb_base.h"
14#include "matroxfb_maven.h"
15#include <linux/i2c.h>
16#include <linux/slab.h>
17#include <linux/i2c-algo-bit.h>
18
19/* MGA-TVO I2C for G200, G400 */
20#define MAT_CLK 0x20
21#define MAT_DATA 0x10
22/* primary head DDC for Mystique(?), G100, G200, G400 */
23#define DDC1_CLK 0x08
24#define DDC1_DATA 0x02
25/* primary head DDC for Millennium, Millennium II */
26#define DDC1B_CLK 0x10
27#define DDC1B_DATA 0x04
28/* secondary head DDC for G400 */
29#define DDC2_CLK 0x04
30#define DDC2_DATA 0x01
31
32/******************************************************/
33
34struct matroxfb_dh_maven_info {
35 struct i2c_bit_adapter maven;
36 struct i2c_bit_adapter ddc1;
37 struct i2c_bit_adapter ddc2;
38};
39
40static int matroxfb_read_gpio(struct matrox_fb_info* minfo) {
41 unsigned long flags;
42 int v;
43
44 matroxfb_DAC_lock_irqsave(flags);
45 v = matroxfb_DAC_in(minfo, DAC_XGENIODATA);
46 matroxfb_DAC_unlock_irqrestore(flags);
47 return v;
48}
49
50static void matroxfb_set_gpio(struct matrox_fb_info* minfo, int mask, int val) {
51 unsigned long flags;
52 int v;
53
54 matroxfb_DAC_lock_irqsave(flags);
55 v = (matroxfb_DAC_in(minfo, DAC_XGENIOCTRL) & mask) | val;
56 matroxfb_DAC_out(minfo, DAC_XGENIOCTRL, v);
57 /* We must reset GENIODATA very often... XFree plays with this register */
58 matroxfb_DAC_out(minfo, DAC_XGENIODATA, 0x00);
59 matroxfb_DAC_unlock_irqrestore(flags);
60}
61
62/* software I2C functions */
63static inline void matroxfb_i2c_set(struct matrox_fb_info* minfo, int mask, int state) {
64 if (state)
65 state = 0;
66 else
67 state = mask;
68 matroxfb_set_gpio(minfo, ~mask, state);
69}
70
71static void matroxfb_gpio_setsda(void* data, int state) {
72 struct i2c_bit_adapter* b = data;
73 matroxfb_i2c_set(b->minfo, b->mask.data, state);
74}
75
76static void matroxfb_gpio_setscl(void* data, int state) {
77 struct i2c_bit_adapter* b = data;
78 matroxfb_i2c_set(b->minfo, b->mask.clock, state);
79}
80
81static int matroxfb_gpio_getsda(void* data) {
82 struct i2c_bit_adapter* b = data;
83 return (matroxfb_read_gpio(b->minfo) & b->mask.data) ? 1 : 0;
84}
85
86static int matroxfb_gpio_getscl(void* data) {
87 struct i2c_bit_adapter* b = data;
88 return (matroxfb_read_gpio(b->minfo) & b->mask.clock) ? 1 : 0;
89}
90
91static const struct i2c_algo_bit_data matrox_i2c_algo_template =
92{
93 .setsda = matroxfb_gpio_setsda,
94 .setscl = matroxfb_gpio_setscl,
95 .getsda = matroxfb_gpio_getsda,
96 .getscl = matroxfb_gpio_getscl,
97 .udelay = 10,
98 .timeout = 100,
99};
100
101static int i2c_bus_reg(struct i2c_bit_adapter* b, struct matrox_fb_info* minfo,
102 unsigned int data, unsigned int clock, const char *name,
103 int class)
104{
105 int err;
106
107 b->minfo = minfo;
108 b->mask.data = data;
109 b->mask.clock = clock;
110 b->adapter.owner = THIS_MODULE;
111 snprintf(b->adapter.name, sizeof(b->adapter.name), name,
112 minfo->fbcon.node);
113 i2c_set_adapdata(&b->adapter, b);
114 b->adapter.class = class;
115 b->adapter.algo_data = &b->bac;
116 b->adapter.dev.parent = &minfo->pcidev->dev;
117 b->bac = matrox_i2c_algo_template;
118 b->bac.data = b;
119 err = i2c_bit_add_bus(&b->adapter);
120 b->initialized = !err;
121 return err;
122}
123
124static void i2c_bit_bus_del(struct i2c_bit_adapter* b) {
125 if (b->initialized) {
126 i2c_del_adapter(&b->adapter);
127 b->initialized = 0;
128 }
129}
130
131static inline void i2c_maven_done(struct matroxfb_dh_maven_info* minfo2) {
132 i2c_bit_bus_del(&minfo2->maven);
133}
134
135static inline void i2c_ddc1_done(struct matroxfb_dh_maven_info* minfo2) {
136 i2c_bit_bus_del(&minfo2->ddc1);
137}
138
139static inline void i2c_ddc2_done(struct matroxfb_dh_maven_info* minfo2) {
140 i2c_bit_bus_del(&minfo2->ddc2);
141}
142
143static void* i2c_matroxfb_probe(struct matrox_fb_info* minfo) {
144 int err;
145 unsigned long flags;
146 struct matroxfb_dh_maven_info* m2info;
147
148 m2info = kzalloc(sizeof(*m2info), GFP_KERNEL);
149 if (!m2info)
150 return NULL;
151
152 matroxfb_DAC_lock_irqsave(flags);
153 matroxfb_DAC_out(minfo, DAC_XGENIODATA, 0xFF);
154 matroxfb_DAC_out(minfo, DAC_XGENIOCTRL, 0x00);
155 matroxfb_DAC_unlock_irqrestore(flags);
156
157 switch (minfo->chip) {
158 case MGA_2064:
159 case MGA_2164:
160 err = i2c_bus_reg(&m2info->ddc1, minfo,
161 DDC1B_DATA, DDC1B_CLK,
162 "DDC:fb%u #0", I2C_CLASS_DDC);
163 break;
164 default:
165 err = i2c_bus_reg(&m2info->ddc1, minfo,
166 DDC1_DATA, DDC1_CLK,
167 "DDC:fb%u #0", I2C_CLASS_DDC);
168 break;
169 }
170 if (err)
171 goto fail_ddc1;
172 if (minfo->devflags.dualhead) {
173 err = i2c_bus_reg(&m2info->ddc2, minfo,
174 DDC2_DATA, DDC2_CLK,
175 "DDC:fb%u #1", I2C_CLASS_DDC);
176 if (err == -ENODEV) {
177 printk(KERN_INFO "i2c-matroxfb: VGA->TV plug detected, DDC unavailable.\n");
178 } else if (err)
179 printk(KERN_INFO "i2c-matroxfb: Could not register secondary output i2c bus. Continuing anyway.\n");
180 /* Register maven bus even on G450/G550 */
181 err = i2c_bus_reg(&m2info->maven, minfo,
182 MAT_DATA, MAT_CLK, "MAVEN:fb%u", 0);
183 if (err)
184 printk(KERN_INFO "i2c-matroxfb: Could not register Maven i2c bus. Continuing anyway.\n");
185 else {
186 struct i2c_board_info maven_info = {
187 I2C_BOARD_INFO("maven", 0x1b),
188 };
189 unsigned short const addr_list[2] = {
190 0x1b, I2C_CLIENT_END
191 };
192
193 i2c_new_probed_device(&m2info->maven.adapter,
194 &maven_info, addr_list, NULL);
195 }
196 }
197 return m2info;
198fail_ddc1:;
199 kfree(m2info);
200 printk(KERN_ERR "i2c-matroxfb: Could not register primary adapter DDC bus.\n");
201 return NULL;
202}
203
204static void i2c_matroxfb_remove(struct matrox_fb_info* minfo, void* data) {
205 struct matroxfb_dh_maven_info* m2info = data;
206
207 i2c_maven_done(m2info);
208 i2c_ddc2_done(m2info);
209 i2c_ddc1_done(m2info);
210 kfree(m2info);
211}
212
213static struct matroxfb_driver i2c_matroxfb = {
214 .node = LIST_HEAD_INIT(i2c_matroxfb.node),
215 .name = "i2c-matroxfb",
216 .probe = i2c_matroxfb_probe,
217 .remove = i2c_matroxfb_remove,
218};
219
220static int __init i2c_matroxfb_init(void) {
221 if (matroxfb_register_driver(&i2c_matroxfb)) {
222 printk(KERN_ERR "i2c-matroxfb: failed to register driver\n");
223 return -ENXIO;
224 }
225 return 0;
226}
227
228static void __exit i2c_matroxfb_exit(void) {
229 matroxfb_unregister_driver(&i2c_matroxfb);
230}
231
232MODULE_AUTHOR("(c) 1999-2002 Petr Vandrovec <vandrove@vc.cvut.cz>");
233MODULE_DESCRIPTION("Support module providing I2C buses present on Matrox videocards");
234
235module_init(i2c_matroxfb_init);
236module_exit(i2c_matroxfb_exit);
237/* no __setup required */
238MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-08 19:04:06 -0500