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489 giacomo 1
/*
2
 *
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 * Hardware accelerated Matrox Millennium I, II, Mystique, G100, G200, G400 and G450.
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 *
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 * (c) 1998-2002 Petr Vandrovec <vandrove@vc.cvut.cz>
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 *
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 * Version: 1.64 2002/06/10
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 *
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 * See matroxfb_base.c for contributors.
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 *
11
 */
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13
#include "matroxfb_base.h"
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#include "matroxfb_maven.h"
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#include <linux/i2c.h>
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#include <linux/i2c-algo-bit.h>
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/* MGA-TVO I2C for G200, G400 */
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#define MAT_CLK         0x20
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#define MAT_DATA        0x10
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/* primary head DDC for Mystique(?), G100, G200, G400 */
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#define DDC1_CLK        0x08
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#define DDC1_DATA       0x02
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/* primary head DDC for Millennium, Millennium II */
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#define DDC1B_CLK       0x10
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#define DDC1B_DATA      0x04
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/* secondary head DDC for G400 */
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#define DDC2_CLK        0x04
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#define DDC2_DATA       0x01
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31
/******************************************************/
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struct matroxfb_dh_maven_info {
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        struct i2c_bit_adapter  maven;
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        struct i2c_bit_adapter  ddc1;
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        struct i2c_bit_adapter  ddc2;
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};
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static int matroxfb_read_gpio(struct matrox_fb_info* minfo) {
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        unsigned long flags;
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        int v;
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43
        matroxfb_DAC_lock_irqsave(flags);
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        v = matroxfb_DAC_in(PMINFO DAC_XGENIODATA);
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        matroxfb_DAC_unlock_irqrestore(flags);
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        return v;
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}
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static void matroxfb_set_gpio(struct matrox_fb_info* minfo, int mask, int val) {
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        unsigned long flags;
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        int v;
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53
        matroxfb_DAC_lock_irqsave(flags);
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        v = (matroxfb_DAC_in(PMINFO DAC_XGENIOCTRL) & mask) | val;
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        matroxfb_DAC_out(PMINFO DAC_XGENIOCTRL, v);
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        /* We must reset GENIODATA very often... XFree plays with this register */
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        matroxfb_DAC_out(PMINFO DAC_XGENIODATA, 0x00);
58
        matroxfb_DAC_unlock_irqrestore(flags);
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}
60
 
61
/* software I2C functions */
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static inline void matroxfb_i2c_set(struct matrox_fb_info* minfo, int mask, int state) {
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        if (state)
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                state = 0;
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        else
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                state = mask;
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        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;
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        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;
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        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;
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        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;
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        return (matroxfb_read_gpio(b->minfo) & b->mask.clock) ? 1 : 0;
88
}
89
 
90
static struct i2c_adapter matrox_i2c_adapter_template =
91
{
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        .owner =        THIS_MODULE,
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        .id =           I2C_HW_B_G400,
94
};
95
 
96
static struct i2c_algo_bit_data matrox_i2c_algo_template =
97
{
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        NULL,
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        matroxfb_gpio_setsda,
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        matroxfb_gpio_setscl,
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        matroxfb_gpio_getsda,
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        matroxfb_gpio_getscl,
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        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;
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        snprintf(b->adapter.name, I2C_NAME_SIZE, name,
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                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);
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                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;
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        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");