drivers/video/fbdev/matrox/i2c-matroxfb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *
   4  * Hardware accelerated Matrox Millennium I, II, Mystique, G100, G200, G400 and G450.
   5  *
   6  * (c) 1998-2002 Petr Vandrovec <vandrove@vc.cvut.cz>
   7  *
   8  * Version: 1.64 2002/06/10
   9  *
  10  * See matroxfb_base.c for contributors.
  11  *
  12  */
  13
  14 #include "matroxfb_base.h"
  15 #include "matroxfb_maven.h"
  16 #include <linux/i2c.h>
  17 #include <linux/slab.h>
  18 #include <linux/i2c-algo-bit.h>
  19
  20 /* MGA-TVO I2C for G200, G400 */
  21 #define MAT_CLK         0x20
  22 #define MAT_DATA        0x10
  23 /* primary head DDC for Mystique(?), G100, G200, G400 */
  24 #define DDC1_CLK        0x08
  25 #define DDC1_DATA       0x02
  26 /* primary head DDC for Millennium, Millennium II */
  27 #define DDC1B_CLK       0x10
  28 #define DDC1B_DATA      0x04
  29 /* secondary head DDC for G400 */
  30 #define DDC2_CLK        0x04
  31 #define DDC2_DATA       0x01
  32
  33 /******************************************************/
  34
  35 struct matroxfb_dh_maven_info {
  36         struct i2c_bit_adapter  maven;
  37         struct i2c_bit_adapter  ddc1;
  38         struct i2c_bit_adapter  ddc2;
  39 };
  40
  41 static int matroxfb_read_gpio(struct matrox_fb_info* minfo) {
  42         unsigned long flags;
  43         int v;
  44
  45         matroxfb_DAC_lock_irqsave(flags);
  46         v = matroxfb_DAC_in(minfo, DAC_XGENIODATA);
  47         matroxfb_DAC_unlock_irqrestore(flags);
  48         return v;
  49 }
  50
  51 static void matroxfb_set_gpio(struct matrox_fb_info* minfo, int mask, int val) {
  52         unsigned long flags;
  53         int v;
  54
  55         matroxfb_DAC_lock_irqsave(flags);
  56         v = (matroxfb_DAC_in(minfo, DAC_XGENIOCTRL) & mask) | val;
  57         matroxfb_DAC_out(minfo, DAC_XGENIOCTRL, v);
  58         /* We must reset GENIODATA very often... XFree plays with this register */
  59         matroxfb_DAC_out(minfo, DAC_XGENIODATA, 0x00);
  60         matroxfb_DAC_unlock_irqrestore(flags);
  61 }
  62
  63 /* software I2C functions */
  64 static inline void matroxfb_i2c_set(struct matrox_fb_info* minfo, int mask, int state) {
  65         if (state)
  66                 state = 0;
  67         else
  68                 state = mask;
  69         matroxfb_set_gpio(minfo, ~mask, state);
  70 }
  71
  72 static void matroxfb_gpio_setsda(void* data, int state) {
  73         struct i2c_bit_adapter* b = data;
  74         matroxfb_i2c_set(b->minfo, b->mask.data, state);
  75 }
  76
  77 static void matroxfb_gpio_setscl(void* data, int state) {
  78         struct i2c_bit_adapter* b = data;
  79         matroxfb_i2c_set(b->minfo, b->mask.clock, state);
  80 }
  81
  82 static int matroxfb_gpio_getsda(void* data) {
  83         struct i2c_bit_adapter* b = data;
  84         return (matroxfb_read_gpio(b->minfo) & b->mask.data) ? 1 : 0;
  85 }
  86
  87 static int matroxfb_gpio_getscl(void* data) {
  88         struct i2c_bit_adapter* b = data;
  89         return (matroxfb_read_gpio(b->minfo) & b->mask.clock) ? 1 : 0;
  90 }
  91
  92 static const struct i2c_algo_bit_data matrox_i2c_algo_template =
  93 {
  94         .setsda         = matroxfb_gpio_setsda,
  95         .setscl         = matroxfb_gpio_setscl,
  96         .getsda         = matroxfb_gpio_getsda,
  97         .getscl         = matroxfb_gpio_getscl,
  98         .udelay         = 10,
  99         .timeout        = 100,
 100 };
 101
 102 static int i2c_bus_reg(struct i2c_bit_adapter* b, struct matrox_fb_info* minfo,
 103                 unsigned int data, unsigned int clock, const char *name)
 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.algo_data = &b->bac;
 115         b->adapter.dev.parent = &minfo->pcidev->dev;
 116         b->bac = matrox_i2c_algo_template;
 117         b->bac.data = b;
 118         err = i2c_bit_add_bus(&b->adapter);
 119         b->initialized = !err;
 120         return err;
 121 }
 122
 123 static void i2c_bit_bus_del(struct i2c_bit_adapter* b) {
 124         if (b->initialized) {
 125                 i2c_del_adapter(&b->adapter);
 126                 b->initialized = 0;
 127         }
 128 }
 129
 130 static inline void i2c_maven_done(struct matroxfb_dh_maven_info* minfo2) {
 131         i2c_bit_bus_del(&minfo2->maven);
 132 }
 133
 134 static inline void i2c_ddc1_done(struct matroxfb_dh_maven_info* minfo2) {
 135         i2c_bit_bus_del(&minfo2->ddc1);
 136 }
 137
 138 static inline void i2c_ddc2_done(struct matroxfb_dh_maven_info* minfo2) {
 139         i2c_bit_bus_del(&minfo2->ddc2);
 140 }
 141
 142 static void* i2c_matroxfb_probe(struct matrox_fb_info* minfo) {
 143         int err;
 144         unsigned long flags;
 145         struct matroxfb_dh_maven_info* m2info;
 146
 147         m2info = kzalloc(sizeof(*m2info), GFP_KERNEL);
 148         if (!m2info)
 149                 return NULL;
 150
 151         matroxfb_DAC_lock_irqsave(flags);
 152         matroxfb_DAC_out(minfo, DAC_XGENIODATA, 0xFF);
 153         matroxfb_DAC_out(minfo, DAC_XGENIOCTRL, 0x00);
 154         matroxfb_DAC_unlock_irqrestore(flags);
 155
 156         switch (minfo->chip) {
 157                 case MGA_2064:
 158                 case MGA_2164:
 159                         err = i2c_bus_reg(&m2info->ddc1, minfo,
 160                                           DDC1B_DATA, DDC1B_CLK,
 161                                           "DDC:fb%u #0");
 162                         break;
 163                 default:
 164                         err = i2c_bus_reg(&m2info->ddc1, minfo,
 165                                           DDC1_DATA, DDC1_CLK,
 166                                           "DDC:fb%u #0");
 167                         break;
 168         }
 169         if (err)
 170                 goto fail_ddc1;
 171         if (minfo->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                 else {
 182                         struct i2c_board_info maven_info = {
 183                                 I2C_BOARD_INFO("maven", 0x1b),
 184                         };
 185                         unsigned short const addr_list[2] = {
 186                                 0x1b, I2C_CLIENT_END
 187                         };
 188
 189                         i2c_new_scanned_device(&m2info->maven.adapter,
 190                                                &maven_info, addr_list, NULL);
 191                 }
 192         }
 193         return m2info;
 194 fail_ddc1:;
 195         kfree(m2info);
 196         printk(KERN_ERR "i2c-matroxfb: Could not register primary adapter DDC bus.\n");
 197         return NULL;
 198 }
 199
 200 static void i2c_matroxfb_remove(struct matrox_fb_info* minfo, void* data) {
 201         struct matroxfb_dh_maven_info* m2info = data;
 202
 203         i2c_maven_done(m2info);
 204         i2c_ddc2_done(m2info);
 205         i2c_ddc1_done(m2info);
 206         kfree(m2info);
 207 }
 208
 209 static struct matroxfb_driver i2c_matroxfb = {
 210         .node =         LIST_HEAD_INIT(i2c_matroxfb.node),
 211         .name =         "i2c-matroxfb",
 212         .probe =        i2c_matroxfb_probe,
 213         .remove =       i2c_matroxfb_remove,
 214 };
 215
 216 static int __init i2c_matroxfb_init(void) {
 217         if (matroxfb_register_driver(&i2c_matroxfb)) {
 218                 printk(KERN_ERR "i2c-matroxfb: failed to register driver\n");
 219                 return -ENXIO;
 220         }
 221         return 0;
 222 }
 223
 224 static void __exit i2c_matroxfb_exit(void) {
 225         matroxfb_unregister_driver(&i2c_matroxfb);
 226 }
 227
 228 MODULE_AUTHOR("(c) 1999-2002 Petr Vandrovec <vandrove@vc.cvut.cz>");
 229 MODULE_DESCRIPTION("Support module providing I2C buses present on Matrox videocards");
 230
 231 module_init(i2c_matroxfb_init);
 232 module_exit(i2c_matroxfb_exit);
 233 /* no __setup required */
 234 MODULE_LICENSE("GPL");