git.oblomov.eu Git - linux-2.6/blob - 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                                  int class)
 105 {
 106         int rc;
 107
 108         chan->dinfo                     = dinfo;
 109         chan->reg                       = reg;
 110         snprintf(chan->adapter.name, sizeof(chan->adapter.name),
 111                  "intelfb %s", name);
 112         chan->adapter.class             = class;
 113         chan->adapter.owner             = THIS_MODULE;
 114         chan->adapter.id                = I2C_HW_B_INTELFB;
 115         chan->adapter.algo_data         = &chan->algo;
 116         chan->adapter.dev.parent        = &chan->dinfo->pdev->dev;
 117         chan->algo.setsda               = intelfb_gpio_setsda;
 118         chan->algo.setscl               = intelfb_gpio_setscl;
 119         chan->algo.getsda               = intelfb_gpio_getsda;
 120         chan->algo.getscl               = intelfb_gpio_getscl;
 121         chan->algo.udelay               = 40;
 122         chan->algo.timeout              = 20;
 123         chan->algo.data                 = chan;
 124
 125         i2c_set_adapdata(&chan->adapter, chan);
 126
 127         /* Raise SCL and SDA */
 128         intelfb_gpio_setsda(chan, 1);
 129         intelfb_gpio_setscl(chan, 1);
 130         udelay(20);
 131
 132         rc = i2c_bit_add_bus(&chan->adapter);
 133         if (rc == 0)
 134                 DBG_MSG("I2C bus %s registered.\n", name);
 135         else
 136                 WRN_MSG("Failed to register I2C bus %s.\n", name);
 137         return rc;
 138 }
 139
 140 void intelfb_create_i2c_busses(struct intelfb_info *dinfo)
 141 {
 142         int i = 0;
 143
 144         /* everyone has at least a single analog output */
 145         dinfo->num_outputs = 1;
 146         dinfo->output[i].type = INTELFB_OUTPUT_ANALOG;
 147
 148         /* setup the DDC bus for analog output */
 149         intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus, GPIOA,
 150                               "CRTDDC_A", I2C_CLASS_DDC);
 151         i++;
 152
 153         /* need to add the output busses for each device
 154            - this function is very incomplete
 155            - i915GM has LVDS and TVOUT for example
 156         */
 157         switch(dinfo->chipset) {
 158         case INTEL_830M:
 159         case INTEL_845G:
 160         case INTEL_855GM:
 161         case INTEL_865G:
 162                 dinfo->output[i].type = INTELFB_OUTPUT_DVO;
 163                 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus,
 164                                       GPIOD, "DVODDC_D", I2C_CLASS_DDC);
 165                 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus,
 166                                       GPIOE, "DVOI2C_E", 0);
 167                 i++;
 168                 break;
 169         case INTEL_915G:
 170         case INTEL_915GM:
 171                 /* has some LVDS + tv-out */
 172         case INTEL_945G:
 173         case INTEL_945GM:
 174         case INTEL_945GME:
 175         case INTEL_965G:
 176         case INTEL_965GM:
 177                 /* SDVO ports have a single control bus - 2 devices */
 178                 dinfo->output[i].type = INTELFB_OUTPUT_SDVO;
 179                 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus,
 180                                       GPIOE, "SDVOCTRL_E", 0);
 181                 /* TODO: initialize the SDVO */
 182                 /* I830SDVOInit(pScrn, i, DVOB); */
 183                 i++;
 184
 185                 /* set up SDVOC */
 186                 dinfo->output[i].type = INTELFB_OUTPUT_SDVO;
 187                 dinfo->output[i].i2c_bus = dinfo->output[i - 1].i2c_bus;
 188                 /* TODO: initialize the SDVO */
 189                 /* I830SDVOInit(pScrn, i, DVOC); */
 190                 i++;
 191                 break;
 192         }
 193         dinfo->num_outputs = i;
 194 }
 195
 196 void intelfb_delete_i2c_busses(struct intelfb_info *dinfo)
 197 {
 198         int i;
 199
 200         for (i = 0; i < MAX_OUTPUTS; i++) {
 201                 if (dinfo->output[i].i2c_bus.dinfo) {
 202                         i2c_del_adapter(&dinfo->output[i].i2c_bus.adapter);
 203                         dinfo->output[i].i2c_bus.dinfo = NULL;
 204                 }
 205                 if (dinfo->output[i].ddc_bus.dinfo) {
 206                         i2c_del_adapter(&dinfo->output[i].ddc_bus.adapter);
 207                         dinfo->output[i].ddc_bus.dinfo = NULL;
 208                 }
 209         }
 210 }