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         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");