drivers/video/riva/rivafb-i2c.c

   1 /*
   2  * linux/drivers/video/riva/fbdev-i2c.c - nVidia i2c
   3  *
   4  * Maintained by Ani Joshi <ajoshi@shell.unixbox.com>
   5  *
   6  * Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
   7  *
   8  * Based on radeonfb-i2c.c
   9  *
  10  * This file is subject to the terms and conditions of the GNU General Public
  11  * License.  See the file COPYING in the main directory of this archive
  12  * for more details.
  13  */
  14
  15 #include <linux/config.h>
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/sched.h>
  19 #include <linux/delay.h>
  20 #include <linux/pci.h>
  21 #include <linux/fb.h>
  22
  23 #include <asm/io.h>
  24
  25 #include "rivafb.h"
  26 #include "../edid.h"
  27
  28 #define RIVA_DDC        0x50
  29
  30 static void riva_gpio_setscl(void* data, int state)
  31 {
  32         struct riva_i2c_chan    *chan = (struct riva_i2c_chan *)data;
  33         struct riva_par         *par = chan->par;
  34         u32                     val;
  35
  36         VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
  37         val = VGA_RD08(par->riva.PCIO, 0x3d5) & 0xf0;
  38
  39         if (state)
  40                 val |= 0x20;
  41         else
  42                 val &= ~0x20;
  43
  44         VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
  45         VGA_WR08(par->riva.PCIO, 0x3d5, val | 0x1);
  46 }
  47
  48 static void riva_gpio_setsda(void* data, int state)
  49 {
  50         struct riva_i2c_chan    *chan = (struct riva_i2c_chan *)data;
  51         struct riva_par         *par = chan->par;
  52         u32                     val;
  53
  54         VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
  55         val = VGA_RD08(par->riva.PCIO, 0x3d5) & 0xf0;
  56
  57         if (state)
  58                 val |= 0x10;
  59         else
  60                 val &= ~0x10;
  61
  62         VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
  63         VGA_WR08(par->riva.PCIO, 0x3d5, val | 0x1);
  64 }
  65
  66 static int riva_gpio_getscl(void* data)
  67 {
  68         struct riva_i2c_chan    *chan = (struct riva_i2c_chan *)data;
  69         struct riva_par         *par = chan->par;
  70         u32                     val = 0;
  71
  72         VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base);
  73         if (VGA_RD08(par->riva.PCIO, 0x3d5) & 0x04)
  74                 val = 1;
  75
  76         val = VGA_RD08(par->riva.PCIO, 0x3d5);
  77
  78         return val;
  79 }
  80
  81 static int riva_gpio_getsda(void* data)
  82 {
  83         struct riva_i2c_chan    *chan = (struct riva_i2c_chan *)data;
  84         struct riva_par         *par = chan->par;
  85         u32                     val = 0;
  86
  87         VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base);
  88         if (VGA_RD08(par->riva.PCIO, 0x3d5) & 0x08)
  89                 val = 1;
  90
  91         return val;
  92 }
  93
  94 #define I2C_ALGO_RIVA   0x0e0000
  95 static int riva_setup_i2c_bus(struct riva_i2c_chan *chan, const char *name)
  96 {
  97         int rc;
  98
  99         strcpy(chan->adapter.name, name);
 100         chan->adapter.owner             = THIS_MODULE;
 101         chan->adapter.id                = I2C_ALGO_RIVA;
 102         chan->adapter.algo_data         = &chan->algo;
 103         chan->adapter.dev.parent        = &chan->par->pdev->dev;
 104         chan->algo.setsda               = riva_gpio_setsda;
 105         chan->algo.setscl               = riva_gpio_setscl;
 106         chan->algo.getsda               = riva_gpio_getsda;
 107         chan->algo.getscl               = riva_gpio_getscl;
 108         chan->algo.udelay               = 40;
 109         chan->algo.mdelay               = 5;
 110         chan->algo.timeout              = 20;
 111         chan->algo.data                 = chan;
 112
 113         i2c_set_adapdata(&chan->adapter, chan);
 114
 115         /* Raise SCL and SDA */
 116         riva_gpio_setsda(chan, 1);
 117         riva_gpio_setscl(chan, 1);
 118         udelay(20);
 119
 120         rc = i2c_bit_add_bus(&chan->adapter);
 121         if (rc == 0)
 122                 dev_dbg(&chan->par->pdev->dev, "I2C bus %s registered.\n", name);
 123         else
 124                 dev_warn(&chan->par->pdev->dev, "Failed to register I2C bus %s.\n", name);
 125         return rc;
 126 }
 127
 128 void riva_create_i2c_busses(struct riva_par *par)
 129 {
 130         par->chan[0].par        = par;
 131         par->chan[1].par        = par;
 132         par->chan[2].par        = par;
 133
 134         par->bus = 0;
 135
 136         switch ((par->pdev->device >> 4) & 0xff) {
 137         case 0x17:
 138         case 0x18:
 139         case 0x25:
 140         case 0x28:
 141         case 0x30:
 142         case 0x31:
 143         case 0x32:
 144         case 0x33:
 145         case 0x34:
 146                 par->chan[2].ddc_base   = 0x50;
 147                 par->bus++;
 148                 riva_setup_i2c_bus(&par->chan[2], "BUS3");
 149         case 0x04:
 150         case 0x05:
 151         case 0x10:
 152         case 0x11:
 153         case 0x15:
 154         case 0x20:
 155                 par->chan[1].ddc_base   = 0x36;
 156                 par->bus++;
 157                 riva_setup_i2c_bus(&par->chan[1], "BUS2");
 158         case 0x03:
 159                 par->chan[0].ddc_base   = 0x3e;
 160                 par->bus++;
 161                 riva_setup_i2c_bus(&par->chan[0], "BUS1");
 162         }
 163 }
 164
 165 void riva_delete_i2c_busses(struct riva_par *par)
 166 {
 167         if (par->chan[0].par)
 168                 i2c_bit_del_bus(&par->chan[0].adapter);
 169         par->chan[0].par = NULL;
 170
 171         if (par->chan[1].par)
 172                 i2c_bit_del_bus(&par->chan[1].adapter);
 173         par->chan[1].par = NULL;
 174
 175 }
 176
 177 static u8 *riva_do_probe_i2c_edid(struct riva_i2c_chan *chan)
 178 {
 179         u8 start = 0x0;
 180         struct i2c_msg msgs[] = {
 181                 {
 182                         .addr   = RIVA_DDC,
 183                         .len    = 1,
 184                         .buf    = &start,
 185                 }, {
 186                         .addr   = RIVA_DDC,
 187                         .flags  = I2C_M_RD,
 188                         .len    = EDID_LENGTH,
 189                 },
 190         };
 191         u8 *buf;
 192
 193         buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
 194         if (!buf) {
 195                 dev_warn(&chan->par->pdev->dev, "Out of memory!\n");
 196                 return NULL;
 197         }
 198         msgs[1].buf = buf;
 199
 200         if (i2c_transfer(&chan->adapter, msgs, 2) == 2)
 201                 return buf;
 202         dev_dbg(&chan->par->pdev->dev, "Unable to read EDID block.\n");
 203         kfree(buf);
 204         return NULL;
 205 }
 206
 207 int riva_probe_i2c_connector(struct riva_par *par, int conn, u8 **out_edid)
 208 {
 209         u8 *edid = NULL;
 210         int i;
 211
 212         for (i = 0; i < 3; i++) {
 213                 /* Do the real work */
 214                 edid = riva_do_probe_i2c_edid(&par->chan[conn-1]);
 215                 if (edid)
 216                         break;
 217         }
 218         if (out_edid)
 219                 *out_edid = edid;
 220         if (!edid)
 221                 return 1;
 222
 223         return 0;
 224 }
 225