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/i2c-algo-bit.h>
17
18 /* MGA-TVO I2C for G200, G400 */
19 #define MAT_CLK 0x20
20 #define MAT_DATA 0x10
21 /* primary head DDC for Mystique(?), G100, G200, G400 */
22 #define DDC1_CLK 0x08
23 #define DDC1_DATA 0x02
24 /* primary head DDC for Millennium, Millennium II */
25 #define DDC1B_CLK 0x10
26 #define DDC1B_DATA 0x04
27 /* secondary head DDC for G400 */
28 #define DDC2_CLK 0x04
29 #define DDC2_DATA 0x01
30
31 /******************************************************/
32
33 struct matroxfb_dh_maven_info {
34 struct i2c_bit_adapter maven;
35 struct i2c_bit_adapter ddc1;
36 struct i2c_bit_adapter ddc2;
37 };
38
39 static int matroxfb_read_gpio(struct matrox_fb_info* minfo) {
40 unsigned long flags;
41 int v;
42
43 matroxfb_DAC_lock_irqsave(flags);
44 v = matroxfb_DAC_in(PMINFO DAC_XGENIODATA);
45 matroxfb_DAC_unlock_irqrestore(flags);
46 return v;
47 }
48
49 static void matroxfb_set_gpio(struct matrox_fb_info* minfo, int mask, int val) {
50 unsigned long flags;
51 int v;
52
53 matroxfb_DAC_lock_irqsave(flags);
54 v = (matroxfb_DAC_in(PMINFO DAC_XGENIOCTRL) & mask) | val;
55 matroxfb_DAC_out(PMINFO DAC_XGENIOCTRL, v);
56 /* We must reset GENIODATA very often... XFree plays with this register */
57 matroxfb_DAC_out(PMINFO DAC_XGENIODATA, 0x00);
58 matroxfb_DAC_unlock_irqrestore(flags);
59 }
60
61 /* software I2C functions */
62 static inline void matroxfb_i2c_set(struct matrox_fb_info* minfo, int mask, int state) {
63 if (state)
64 state = 0;
65 else
66 state = mask;
67 matroxfb_set_gpio(minfo, ~mask, state);
68 }
69
70 static void matroxfb_gpio_setsda(void* data, int state) {
71 struct i2c_bit_adapter* b = data;
72 matroxfb_i2c_set(b->minfo, b->mask.data, state);
73 }
74
75 static void matroxfb_gpio_setscl(void* data, int state) {
76 struct i2c_bit_adapter* b = data;
77 matroxfb_i2c_set(b->minfo, b->mask.clock, state);
78 }
79
80 static int matroxfb_gpio_getsda(void* data) {
81 struct i2c_bit_adapter* b = data;
82 return (matroxfb_read_gpio(b->minfo) & b->mask.data) ? 1 : 0;
83 }
84
85 static int matroxfb_gpio_getscl(void* data) {
86 struct i2c_bit_adapter* b = data;
87 return (matroxfb_read_gpio(b->minfo) & b->mask.clock) ? 1 : 0;
88 }
89
90 static struct i2c_adapter matrox_i2c_adapter_template =
91 {
92 .owner = THIS_MODULE,
93 .id = I2C_HW_B_G400,
94 };
95
96 static struct i2c_algo_bit_data matrox_i2c_algo_template =
97 {
98 NULL,
99 matroxfb_gpio_setsda,
100 matroxfb_gpio_setscl,
101 matroxfb_gpio_getsda,
102 matroxfb_gpio_getscl,
103 10, 10, 100,
104 };
105
106 static int i2c_bus_reg(struct i2c_bit_adapter* b, struct matrox_fb_info* minfo,
107 unsigned int data, unsigned int clock, const char* name) {
108 int err;
109
110 b->minfo = minfo;
111 b->mask.data = data;
112 b->mask.clock = clock;
113 b->adapter = matrox_i2c_adapter_template;
114 snprintf(b->adapter.name, I2C_NAME_SIZE, name,
115 minfo->fbcon.node);
116 i2c_set_adapdata(&b->adapter, b);
117 b->adapter.algo_data = &b->bac;
118 b->bac = matrox_i2c_algo_template;
119 b->bac.data = b;
120 err = i2c_bit_add_bus(&b->adapter);
121 b->initialized = !err;
122 return err;
123 }
124
125 static void i2c_bit_bus_del(struct i2c_bit_adapter* b) {
126 if (b->initialized) {
127 i2c_bit_del_bus(&b->adapter);
128 b->initialized = 0;
129 }
130 }
131
132 static inline void i2c_maven_done(struct matroxfb_dh_maven_info* minfo2) {
133 i2c_bit_bus_del(&minfo2->maven);
134 }
135
136 static inline void i2c_ddc1_done(struct matroxfb_dh_maven_info* minfo2) {
137 i2c_bit_bus_del(&minfo2->ddc1);
138 }
139
140 static inline void i2c_ddc2_done(struct matroxfb_dh_maven_info* minfo2) {
141 i2c_bit_bus_del(&minfo2->ddc2);
142 }
143
144 static void* i2c_matroxfb_probe(struct matrox_fb_info* minfo) {
145 int err;
146 unsigned long flags;
147 struct matroxfb_dh_maven_info* m2info;
148
149 m2info = (struct matroxfb_dh_maven_info*)kmalloc(sizeof(*m2info), GFP_KERNEL);
150 if (!m2info)
151 return NULL;
152
153 matroxfb_DAC_lock_irqsave(flags);
154 matroxfb_DAC_out(PMINFO DAC_XGENIODATA, 0xFF);
155 matroxfb_DAC_out(PMINFO DAC_XGENIOCTRL, 0x00);
156 matroxfb_DAC_unlock_irqrestore(flags);
157
158 memset(m2info, 0, sizeof(*m2info));
159
160 switch (ACCESS_FBINFO(chip)) {
161 case MGA_2064:
162 case MGA_2164:
163 err = i2c_bus_reg(&m2info->ddc1, minfo, DDC1B_DATA, DDC1B_CLK, "DDC:fb%u #0");
164 break;
165 default:
166 err = i2c_bus_reg(&m2info->ddc1, minfo, DDC1_DATA, DDC1_CLK, "DDC:fb%u #0");
167 break;
168 }
169 if (err)
170 goto fail_ddc1;
171 if (ACCESS_FBINFO(devflags.dualhead)) {
172 err = i2c_bus_reg(&m2info->ddc2, minfo, DDC2_DATA, DDC2_CLK, "DDC:fb%u #1");
173 if (err == -ENODEV) {
174 printk(KERN_INFO "i2c-matroxfb: VGA->TV plug detected, DDC unavailable.\n");
175 } else if (err)
176 printk(KERN_INFO "i2c-matroxfb: Could not register secondary output i2c bus. Continuing anyway.\n");
177 /* Register maven bus even on G450/G550 */
178 err = i2c_bus_reg(&m2info->maven, minfo, MAT_DATA, MAT_CLK, "MAVEN:fb%u");
179 if (err)
180 printk(KERN_INFO "i2c-matroxfb: Could not register Maven i2c bus. Continuing anyway.\n");
181 }
182 return m2info;
183 fail_ddc1:;
184 kfree(m2info);
185 printk(KERN_ERR "i2c-matroxfb: Could not register primary adapter DDC bus.\n");
186 return NULL;
187 }
188
189 static void i2c_matroxfb_remove(struct matrox_fb_info* minfo, void* data) {
190 struct matroxfb_dh_maven_info* m2info = data;
191
192 i2c_maven_done(m2info);
193 i2c_ddc2_done(m2info);
194 i2c_ddc1_done(m2info);
195 kfree(m2info);
196 }
197
198 static struct matroxfb_driver i2c_matroxfb = {
199 .node = LIST_HEAD_INIT(i2c_matroxfb.node),
200 .name = "i2c-matroxfb",
201 .probe = i2c_matroxfb_probe,
202 .remove = i2c_matroxfb_remove,
203 };
204
205 static int __init i2c_matroxfb_init(void) {
206 if (matroxfb_register_driver(&i2c_matroxfb)) {
207 printk(KERN_ERR "i2c-matroxfb: failed to register driver\n");
208 return -ENXIO;
209 }
210 return 0;
211 }
212
213 static void __exit i2c_matroxfb_exit(void) {
214 matroxfb_unregister_driver(&i2c_matroxfb);
215 }
216
217 MODULE_AUTHOR("(c) 1999-2002 Petr Vandrovec <vandrove@vc.cvut.cz>");
218 MODULE_DESCRIPTION("Support module providing I2C buses present on Matrox videocards");
219
220 module_init(i2c_matroxfb_init);
221 module_exit(i2c_matroxfb_exit);
222 /* no __setup required */
223 MODULE_LICENSE("GPL");
224
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