drivers/video/fbdev/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/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
  34 struct matroxfb_dh_maven_info {
  35         struct i2c_bit_adapter  maven;
  36         struct i2c_bit_adapter  ddc1;
  37         struct i2c_bit_adapter  ddc2;
  38 };
  39
  40 static 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
  50 static 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 */
  63 static 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
  71 static 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
  76 static 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
  81 static 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
  86 static 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
  91 static 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
 101 static 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
 124 static 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
 131 static inline void i2c_maven_done(struct matroxfb_dh_maven_info* minfo2) {
 132         i2c_bit_bus_del(&minfo2->maven);
 133 }
 134
 135 static inline void i2c_ddc1_done(struct matroxfb_dh_maven_info* minfo2) {
 136         i2c_bit_bus_del(&minfo2->ddc1);
 137 }
 138
 139 static inline void i2c_ddc2_done(struct matroxfb_dh_maven_info* minfo2) {
 140         i2c_bit_bus_del(&minfo2->ddc2);
 141 }
 142
 143 static 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;
 198 fail_ddc1:;
 199         kfree(m2info);
 200         printk(KERN_ERR "i2c-matroxfb: Could not register primary adapter DDC bus.\n");
 201         return NULL;
 202 }
 203
 204 static 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
 213 static 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
 220 static 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
 228 static void __exit i2c_matroxfb_exit(void) {
 229         matroxfb_unregister_driver(&i2c_matroxfb);
 230 }
 231
 232 MODULE_AUTHOR("(c) 1999-2002 Petr Vandrovec <vandrove@vc.cvut.cz>");
 233 MODULE_DESCRIPTION("Support module providing I2C buses present on Matrox videocards");
 234
 235 module_init(i2c_matroxfb_init);
 236 module_exit(i2c_matroxfb_exit);
 237 /* no __setup required */
 238 MODULE_LICENSE("GPL");