Merge branch 'for-linus' of git://neil.brown.name/md
[linux-2.6] / drivers / video / matrox / i2c-matroxfb.c
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         .setsda         = matroxfb_gpio_setsda,
99         .setscl         = matroxfb_gpio_setscl,
100         .getsda         = matroxfb_gpio_getsda,
101         .getscl         = matroxfb_gpio_getscl,
102         .udelay         = 10,
103         .timeout        = 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 class)
109 {
110         int err;
111
112         b->minfo = minfo;
113         b->mask.data = data;
114         b->mask.clock = clock;
115         b->adapter = matrox_i2c_adapter_template;
116         snprintf(b->adapter.name, sizeof(b->adapter.name), name,
117                 minfo->fbcon.node);
118         i2c_set_adapdata(&b->adapter, b);
119         b->adapter.class = class;
120         b->adapter.algo_data = &b->bac;
121         b->adapter.dev.parent = &ACCESS_FBINFO(pcidev)->dev;
122         b->bac = matrox_i2c_algo_template;
123         b->bac.data = b;
124         err = i2c_bit_add_bus(&b->adapter);
125         b->initialized = !err;
126         return err;
127 }
128
129 static void i2c_bit_bus_del(struct i2c_bit_adapter* b) {
130         if (b->initialized) {
131                 i2c_del_adapter(&b->adapter);
132                 b->initialized = 0;
133         }
134 }
135
136 static inline void i2c_maven_done(struct matroxfb_dh_maven_info* minfo2) {
137         i2c_bit_bus_del(&minfo2->maven);
138 }
139
140 static inline void i2c_ddc1_done(struct matroxfb_dh_maven_info* minfo2) {
141         i2c_bit_bus_del(&minfo2->ddc1);
142 }
143
144 static inline void i2c_ddc2_done(struct matroxfb_dh_maven_info* minfo2) {
145         i2c_bit_bus_del(&minfo2->ddc2);
146 }
147
148 static void* i2c_matroxfb_probe(struct matrox_fb_info* minfo) {
149         int err;
150         unsigned long flags;
151         struct matroxfb_dh_maven_info* m2info;
152
153         m2info = kzalloc(sizeof(*m2info), GFP_KERNEL);
154         if (!m2info)
155                 return NULL;
156
157         matroxfb_DAC_lock_irqsave(flags);
158         matroxfb_DAC_out(PMINFO DAC_XGENIODATA, 0xFF);
159         matroxfb_DAC_out(PMINFO DAC_XGENIOCTRL, 0x00);
160         matroxfb_DAC_unlock_irqrestore(flags);
161
162         switch (ACCESS_FBINFO(chip)) {
163                 case MGA_2064:
164                 case MGA_2164:
165                         err = i2c_bus_reg(&m2info->ddc1, minfo,
166                                           DDC1B_DATA, DDC1B_CLK,
167                                           "DDC:fb%u #0", I2C_CLASS_DDC);
168                         break;
169                 default:
170                         err = i2c_bus_reg(&m2info->ddc1, minfo,
171                                           DDC1_DATA, DDC1_CLK,
172                                           "DDC:fb%u #0", I2C_CLASS_DDC);
173                         break;
174         }
175         if (err)
176                 goto fail_ddc1;
177         if (ACCESS_FBINFO(devflags.dualhead)) {
178                 err = i2c_bus_reg(&m2info->ddc2, minfo,
179                                   DDC2_DATA, DDC2_CLK,
180                                   "DDC:fb%u #1", I2C_CLASS_DDC);
181                 if (err == -ENODEV) {
182                         printk(KERN_INFO "i2c-matroxfb: VGA->TV plug detected, DDC unavailable.\n");
183                 } else if (err)
184                         printk(KERN_INFO "i2c-matroxfb: Could not register secondary output i2c bus. Continuing anyway.\n");
185                 /* Register maven bus even on G450/G550 */
186                 err = i2c_bus_reg(&m2info->maven, minfo,
187                                   MAT_DATA, MAT_CLK, "MAVEN:fb%u", 0);
188                 if (err)
189                         printk(KERN_INFO "i2c-matroxfb: Could not register Maven i2c bus. Continuing anyway.\n");
190         }
191         return m2info;
192 fail_ddc1:;
193         kfree(m2info);
194         printk(KERN_ERR "i2c-matroxfb: Could not register primary adapter DDC bus.\n");
195         return NULL;
196 }
197
198 static void i2c_matroxfb_remove(struct matrox_fb_info* minfo, void* data) {
199         struct matroxfb_dh_maven_info* m2info = data;
200
201         i2c_maven_done(m2info);
202         i2c_ddc2_done(m2info);
203         i2c_ddc1_done(m2info);
204         kfree(m2info);
205 }
206
207 static struct matroxfb_driver i2c_matroxfb = {
208         .node =         LIST_HEAD_INIT(i2c_matroxfb.node),
209         .name =         "i2c-matroxfb",
210         .probe =        i2c_matroxfb_probe,
211         .remove =       i2c_matroxfb_remove,
212 };
213
214 static int __init i2c_matroxfb_init(void) {
215         if (matroxfb_register_driver(&i2c_matroxfb)) {
216                 printk(KERN_ERR "i2c-matroxfb: failed to register driver\n");
217                 return -ENXIO;
218         }
219         return 0;
220 }
221
222 static void __exit i2c_matroxfb_exit(void) {
223         matroxfb_unregister_driver(&i2c_matroxfb);
224 }
225
226 MODULE_AUTHOR("(c) 1999-2002 Petr Vandrovec <vandrove@vc.cvut.cz>");
227 MODULE_DESCRIPTION("Support module providing I2C buses present on Matrox videocards");
228
229 module_init(i2c_matroxfb_init);
230 module_exit(i2c_matroxfb_exit);
231 /* no __setup required */
232 MODULE_LICENSE("GPL");