drivers/video/intelfb/intelfb_i2c.c

   1 /**************************************************************************
   2
   3  Copyright 2006 Dave Airlie <airlied@linux.ie>
   4
   5 All Rights Reserved.
   6
   7 Permission is hereby granted, free of charge, to any person obtaining a
   8 copy of this software and associated documentation files (the "Software"),
   9 to deal in the Software without restriction, including without limitation
  10 on the rights to use, copy, modify, merge, publish, distribute, sub
  11 license, and/or sell copies of the Software, and to permit persons to whom
  12 the Software is furnished to do so, subject to the following conditions:
  13
  14 The above copyright notice and this permission notice (including the next
  15 paragraph) shall be included in all copies or substantial portions of the
  16 Software.
  17
  18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21 THE COPYRIGHT HOLDERS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22 DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23 OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24 USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26 **************************************************************************/
  27
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/delay.h>
  31 #include <linux/pci.h>
  32 #include <linux/fb.h>
  33
  34 #include <linux/i2c.h>
  35 #include <linux/i2c-id.h>
  36 #include <linux/i2c-algo-bit.h>
  37
  38 #include <asm/io.h>
  39
  40 #include "intelfb.h"
  41 #include "intelfbhw.h"
  42
  43 /* bit locations in the registers */
  44 #define SCL_DIR_MASK            0x0001
  45 #define SCL_DIR                 0x0002
  46 #define SCL_VAL_MASK            0x0004
  47 #define SCL_VAL_OUT             0x0008
  48 #define SCL_VAL_IN              0x0010
  49 #define SDA_DIR_MASK            0x0100
  50 #define SDA_DIR                 0x0200
  51 #define SDA_VAL_MASK            0x0400
  52 #define SDA_VAL_OUT             0x0800
  53 #define SDA_VAL_IN              0x1000
  54
  55 static void intelfb_gpio_setscl(void *data, int state)
  56 {
  57         struct intelfb_i2c_chan *chan = data;
  58         struct intelfb_info *dinfo = chan->dinfo;
  59         u32 val;
  60
  61         OUTREG(chan->reg, (state ? SCL_VAL_OUT : 0) |
  62                SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK);
  63         val = INREG(chan->reg);
  64 }
  65
  66 static void intelfb_gpio_setsda(void *data, int state)
  67 {
  68         struct intelfb_i2c_chan *chan = data;
  69         struct intelfb_info *dinfo = chan->dinfo;
  70         u32 val;
  71
  72         OUTREG(chan->reg, (state ? SDA_VAL_OUT : 0) |
  73                SDA_DIR | SDA_DIR_MASK | SDA_VAL_MASK);
  74         val = INREG(chan->reg);
  75 }
  76
  77 static int intelfb_gpio_getscl(void *data)
  78 {
  79         struct intelfb_i2c_chan *chan = data;
  80         struct intelfb_info *dinfo = chan->dinfo;
  81         u32 val;
  82
  83         OUTREG(chan->reg, SCL_DIR_MASK);
  84         OUTREG(chan->reg, 0);
  85         val = INREG(chan->reg);
  86         return ((val & SCL_VAL_IN) != 0);
  87 }
  88
  89 static int intelfb_gpio_getsda(void *data)
  90 {
  91         struct intelfb_i2c_chan *chan = data;
  92         struct intelfb_info *dinfo = chan->dinfo;
  93         u32 val;
  94
  95         OUTREG(chan->reg, SDA_DIR_MASK);
  96         OUTREG(chan->reg, 0);
  97         val = INREG(chan->reg);
  98         return ((val & SDA_VAL_IN) != 0);
  99 }
 100
 101 static int intelfb_setup_i2c_bus(struct intelfb_info *dinfo,
 102                                  struct intelfb_i2c_chan *chan,
 103                                  const u32 reg, const char *name)
 104 {
 105         int rc;
 106
 107         chan->dinfo                     = dinfo;
 108         chan->reg                       = reg;
 109         snprintf(chan->adapter.name, sizeof(chan->adapter.name),
 110                  "intelfb %s", name);
 111         chan->adapter.owner             = THIS_MODULE;
 112         chan->adapter.id                = I2C_HW_B_INTELFB;
 113         chan->adapter.algo_data         = &chan->algo;
 114         chan->adapter.dev.parent        = &chan->dinfo->pdev->dev;
 115         chan->algo.setsda               = intelfb_gpio_setsda;
 116         chan->algo.setscl               = intelfb_gpio_setscl;
 117         chan->algo.getsda               = intelfb_gpio_getsda;
 118         chan->algo.getscl               = intelfb_gpio_getscl;
 119         chan->algo.udelay               = 40;
 120         chan->algo.timeout              = 20;
 121         chan->algo.data                 = chan;
 122
 123         i2c_set_adapdata(&chan->adapter, chan);
 124
 125         /* Raise SCL and SDA */
 126         intelfb_gpio_setsda(chan, 1);
 127         intelfb_gpio_setscl(chan, 1);
 128         udelay(20);
 129
 130         rc = i2c_bit_add_bus(&chan->adapter);
 131         if (rc == 0)
 132                 DBG_MSG("I2C bus %s registered.\n", name);
 133         else
 134                 WRN_MSG("Failed to register I2C bus %s.\n", name);
 135         return rc;
 136 }
 137
 138 void intelfb_create_i2c_busses(struct intelfb_info *dinfo)
 139 {
 140         int i = 0;
 141
 142         /* everyone has at least a single analog output */
 143         dinfo->num_outputs = 1;
 144         dinfo->output[i].type = INTELFB_OUTPUT_ANALOG;
 145
 146         /* setup the DDC bus for analog output */
 147         intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus, GPIOA,
 148                               "CRTDDC_A");
 149         i++;
 150
 151         /* need to add the output busses for each device
 152            - this function is very incomplete
 153            - i915GM has LVDS and TVOUT for example
 154         */
 155         switch(dinfo->chipset) {
 156         case INTEL_830M:
 157         case INTEL_845G:
 158         case INTEL_855GM:
 159         case INTEL_865G:
 160                 dinfo->output[i].type = INTELFB_OUTPUT_DVO;
 161                 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus,
 162                                       GPIOD, "DVODDC_D");
 163                 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus,
 164                                       GPIOE, "DVOI2C_E");
 165                 i++;
 166                 break;
 167         case INTEL_915G:
 168         case INTEL_915GM:
 169                 /* has some LVDS + tv-out */
 170         case INTEL_945G:
 171         case INTEL_945GM:
 172                 /* SDVO ports have a single control bus - 2 devices */
 173                 dinfo->output[i].type = INTELFB_OUTPUT_SDVO;
 174                 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus,
 175                                       GPIOE, "SDVOCTRL_E");
 176                 /* TODO: initialize the SDVO */
 177                 /* I830SDVOInit(pScrn, i, DVOB); */
 178                 i++;
 179
 180                 /* set up SDVOC */
 181                 dinfo->output[i].type = INTELFB_OUTPUT_SDVO;
 182                 dinfo->output[i].i2c_bus = dinfo->output[i - 1].i2c_bus;
 183                 /* TODO: initialize the SDVO */
 184                 /* I830SDVOInit(pScrn, i, DVOC); */
 185                 i++;
 186                 break;
 187         }
 188         dinfo->num_outputs = i;
 189 }
 190
 191 void intelfb_delete_i2c_busses(struct intelfb_info *dinfo)
 192 {
 193         int i;
 194
 195         for (i = 0; i < MAX_OUTPUTS; i++) {
 196                 if (dinfo->output[i].i2c_bus.dinfo) {
 197                         i2c_del_adapter(&dinfo->output[i].i2c_bus.adapter);
 198                         dinfo->output[i].i2c_bus.dinfo = NULL;
 199                 }
 200                 if (dinfo->output[i].ddc_bus.dinfo) {
 201                         i2c_del_adapter(&dinfo->output[i].ddc_bus.adapter);
 202                         dinfo->output[i].ddc_bus.dinfo = NULL;
 203                 }
 204         }
 205 }