drivers/video/aty/radeon_i2c.c

   1 #include "radeonfb.h"
   2
   3 #include <linux/module.h>
   4 #include <linux/kernel.h>
   5 #include <linux/delay.h>
   6 #include <linux/fb.h>
   7
   8
   9 #include <linux/i2c.h>
  10 #include <linux/i2c-id.h>
  11 #include <linux/i2c-algo-bit.h>
  12
  13 #include <asm/io.h>
  14
  15 #include <video/radeon.h>
  16 #include "../edid.h"
  17
  18 static void radeon_gpio_setscl(void* data, int state)
  19 {
  20         struct radeon_i2c_chan  *chan = data;
  21         struct radeonfb_info    *rinfo = chan->rinfo;
  22         u32                     val;
  23
  24         val = INREG(chan->ddc_reg) & ~(VGA_DDC_CLK_OUT_EN);
  25         if (!state)
  26                 val |= VGA_DDC_CLK_OUT_EN;
  27
  28         OUTREG(chan->ddc_reg, val);
  29         (void)INREG(chan->ddc_reg);
  30 }
  31
  32 static void radeon_gpio_setsda(void* data, int state)
  33 {
  34         struct radeon_i2c_chan  *chan = data;
  35         struct radeonfb_info    *rinfo = chan->rinfo;
  36         u32                     val;
  37
  38         val = INREG(chan->ddc_reg) & ~(VGA_DDC_DATA_OUT_EN);
  39         if (!state)
  40                 val |= VGA_DDC_DATA_OUT_EN;
  41
  42         OUTREG(chan->ddc_reg, val);
  43         (void)INREG(chan->ddc_reg);
  44 }
  45
  46 static int radeon_gpio_getscl(void* data)
  47 {
  48         struct radeon_i2c_chan  *chan = data;
  49         struct radeonfb_info    *rinfo = chan->rinfo;
  50         u32                     val;
  51
  52         val = INREG(chan->ddc_reg);
  53
  54         return (val & VGA_DDC_CLK_INPUT) ? 1 : 0;
  55 }
  56
  57 static int radeon_gpio_getsda(void* data)
  58 {
  59         struct radeon_i2c_chan  *chan = data;
  60         struct radeonfb_info    *rinfo = chan->rinfo;
  61         u32                     val;
  62
  63         val = INREG(chan->ddc_reg);
  64
  65         return (val & VGA_DDC_DATA_INPUT) ? 1 : 0;
  66 }
  67
  68 static int radeon_setup_i2c_bus(struct radeon_i2c_chan *chan, const char *name)
  69 {
  70         int rc;
  71
  72         strcpy(chan->adapter.name, name);
  73         chan->adapter.owner             = THIS_MODULE;
  74         chan->adapter.id                = I2C_HW_B_RADEON;
  75         chan->adapter.algo_data         = &chan->algo;
  76         chan->adapter.dev.parent        = &chan->rinfo->pdev->dev;
  77         chan->algo.setsda               = radeon_gpio_setsda;
  78         chan->algo.setscl               = radeon_gpio_setscl;
  79         chan->algo.getsda               = radeon_gpio_getsda;
  80         chan->algo.getscl               = radeon_gpio_getscl;
  81         chan->algo.udelay               = 10;
  82         chan->algo.timeout              = 20;
  83         chan->algo.data                 = chan;
  84
  85         i2c_set_adapdata(&chan->adapter, chan);
  86
  87         /* Raise SCL and SDA */
  88         radeon_gpio_setsda(chan, 1);
  89         radeon_gpio_setscl(chan, 1);
  90         udelay(20);
  91
  92         rc = i2c_bit_add_bus(&chan->adapter);
  93         if (rc == 0)
  94                 dev_dbg(&chan->rinfo->pdev->dev, "I2C bus %s registered.\n", name);
  95         else
  96                 dev_warn(&chan->rinfo->pdev->dev, "Failed to register I2C bus %s.\n", name);
  97         return rc;
  98 }
  99
 100 void radeon_create_i2c_busses(struct radeonfb_info *rinfo)
 101 {
 102         rinfo->i2c[0].rinfo     = rinfo;
 103         rinfo->i2c[0].ddc_reg   = GPIO_MONID;
 104         radeon_setup_i2c_bus(&rinfo->i2c[0], "monid");
 105
 106         rinfo->i2c[1].rinfo     = rinfo;
 107         rinfo->i2c[1].ddc_reg   = GPIO_DVI_DDC;
 108         radeon_setup_i2c_bus(&rinfo->i2c[1], "dvi");
 109
 110         rinfo->i2c[2].rinfo     = rinfo;
 111         rinfo->i2c[2].ddc_reg   = GPIO_VGA_DDC;
 112         radeon_setup_i2c_bus(&rinfo->i2c[2], "vga");
 113
 114         rinfo->i2c[3].rinfo     = rinfo;
 115         rinfo->i2c[3].ddc_reg   = GPIO_CRT2_DDC;
 116         radeon_setup_i2c_bus(&rinfo->i2c[3], "crt2");
 117 }
 118
 119 void radeon_delete_i2c_busses(struct radeonfb_info *rinfo)
 120 {
 121         if (rinfo->i2c[0].rinfo)
 122                 i2c_del_adapter(&rinfo->i2c[0].adapter);
 123         rinfo->i2c[0].rinfo = NULL;
 124
 125         if (rinfo->i2c[1].rinfo)
 126                 i2c_del_adapter(&rinfo->i2c[1].adapter);
 127         rinfo->i2c[1].rinfo = NULL;
 128
 129         if (rinfo->i2c[2].rinfo)
 130                 i2c_del_adapter(&rinfo->i2c[2].adapter);
 131         rinfo->i2c[2].rinfo = NULL;
 132
 133         if (rinfo->i2c[3].rinfo)
 134                 i2c_del_adapter(&rinfo->i2c[3].adapter);
 135         rinfo->i2c[3].rinfo = NULL;
 136 }
 137
 138 int radeon_probe_i2c_connector(struct radeonfb_info *rinfo, int conn,
 139                                u8 **out_edid)
 140 {
 141         u32 reg = rinfo->i2c[conn-1].ddc_reg;
 142         u8 *edid;
 143
 144         OUTREG(reg, INREG(reg) &
 145                         ~(VGA_DDC_DATA_OUTPUT | VGA_DDC_CLK_OUTPUT));
 146
 147         edid = fb_ddc_read(&rinfo->i2c[conn-1].adapter);
 148
 149         if (out_edid)
 150                 *out_edid = edid;
 151         if (!edid) {
 152                 pr_debug("radeonfb: I2C (port %d) ... not found\n", conn);
 153                 return MT_NONE;
 154         }
 155         if (edid[0x14] & 0x80) {
 156                 /* Fix detection using BIOS tables */
 157                 if (rinfo->is_mobility /*&& conn == ddc_dvi*/ &&
 158                     (INREG(LVDS_GEN_CNTL) & LVDS_ON)) {
 159                         pr_debug("radeonfb: I2C (port %d) ... found LVDS panel\n", conn);
 160                         return MT_LCD;
 161                 } else {
 162                         pr_debug("radeonfb: I2C (port %d) ... found TMDS panel\n", conn);
 163                         return MT_DFP;
 164                 }
 165         }
 166         pr_debug("radeonfb: I2C (port %d) ... found CRT display\n", conn);
 167         return MT_CRT;
 168 }
 169