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) | SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK);
  62         val = INREG(chan->reg);
  63 }
  64
  65 static void intelfb_gpio_setsda(void *data, int state)
  66 {
  67         struct intelfb_i2c_chan *chan = data;
  68         struct intelfb_info *dinfo = chan->dinfo;
  69         u32 val;
  70
  71         OUTREG(chan->reg, (state ? SDA_VAL_OUT : 0) | SDA_DIR | SDA_DIR_MASK | SDA_VAL_MASK);
  72         val = INREG(chan->reg);
  73 }
  74
  75 static int intelfb_gpio_getscl(void *data)
  76 {
  77         struct intelfb_i2c_chan *chan = data;
  78         struct intelfb_info *dinfo = chan->dinfo;
  79         u32 val;
  80
  81         OUTREG(chan->reg, SCL_DIR_MASK);
  82         OUTREG(chan->reg, 0);
  83         val = INREG(chan->reg);
  84         return ((val & SCL_VAL_IN) != 0);
  85 }
  86
  87 static int intelfb_gpio_getsda(void *data)
  88 {
  89         struct intelfb_i2c_chan *chan = data;
  90         struct intelfb_info *dinfo = chan->dinfo;
  91         u32 val;
  92
  93         OUTREG(chan->reg, SDA_DIR_MASK);
  94         OUTREG(chan->reg, 0);
  95         val = INREG(chan->reg);
  96         return ((val & SDA_VAL_IN) != 0);
  97 }
  98
  99 static int intelfb_setup_i2c_bus(struct intelfb_info *dinfo,
 100                                                                  struct intelfb_i2c_chan *chan,
 101                                                                  const u32 reg, const char *name)
 102 {
 103         int rc;
 104
 105         chan->dinfo                                     = dinfo;
 106         chan->reg                                       = reg;
 107         snprintf(chan->adapter.name, I2C_NAME_SIZE, "intelfb %s", name);
 108         chan->adapter.owner                     = THIS_MODULE;
 109         chan->adapter.id                        = I2C_HW_B_INTELFB;
 110         chan->adapter.algo_data         = &chan->algo;
 111         chan->adapter.dev.parent        = &chan->dinfo->pdev->dev;
 112         chan->algo.setsda                       = intelfb_gpio_setsda;
 113         chan->algo.setscl                       = intelfb_gpio_setscl;
 114         chan->algo.getsda                       = intelfb_gpio_getsda;
 115         chan->algo.getscl                       = intelfb_gpio_getscl;
 116         chan->algo.udelay                       = 40;
 117         chan->algo.timeout                      = 20;
 118         chan->algo.data                         = chan;
 119
 120         i2c_set_adapdata(&chan->adapter, chan);
 121
 122         /* Raise SCL and SDA */
 123         intelfb_gpio_setsda(chan, 1);
 124         intelfb_gpio_setscl(chan, 1);
 125         udelay(20);
 126
 127         rc = i2c_bit_add_bus(&chan->adapter);
 128         if (rc == 0)
 129                 DBG_MSG("I2C bus %s registered.\n", name);
 130         else
 131                 WRN_MSG("Failed to register I2C bus %s.\n", name);
 132         return rc;
 133 }
 134
 135 void intelfb_create_i2c_busses(struct intelfb_info *dinfo)
 136 {
 137         int i = 0;
 138
 139         /* everyone has at least a single analog output */
 140         dinfo->num_outputs = 1;
 141         dinfo->output[i].type = INTELFB_OUTPUT_ANALOG;
 142
 143         /* setup the DDC bus for analog output */
 144         intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus, GPIOA, "CRTDDC_A");
 145         i++;
 146
 147     /* need to add the output busses for each device
 148        - this function is very incomplete
 149        - i915GM has LVDS and TVOUT for example
 150     */
 151     switch(dinfo->chipset) {
 152         case INTEL_830M:
 153         case INTEL_845G:
 154         case INTEL_855GM:
 155         case INTEL_865G:
 156                 dinfo->output[i].type = INTELFB_OUTPUT_DVO;
 157                 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus, GPIOD, "DVODDC_D");
 158                 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus, GPIOE, "DVOI2C_E");
 159                 i++;
 160                 break;
 161         case INTEL_915G:
 162         case INTEL_915GM:
 163                 /* has  some LVDS + tv-out */
 164         case INTEL_945G:
 165         case INTEL_945GM:
 166                 /* SDVO ports have a single control bus - 2 devices */
 167                 dinfo->output[i].type = INTELFB_OUTPUT_SDVO;
 168                 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus, GPIOE, "SDVOCTRL_E");
 169                 /* TODO: initialize the SDVO */
 170 //              I830SDVOInit(pScrn, i, DVOB);
 171                 i++;
 172
 173                 /* set up SDVOC */
 174                 dinfo->output[i].type = INTELFB_OUTPUT_SDVO;
 175                 dinfo->output[i].i2c_bus = dinfo->output[i - 1].i2c_bus;
 176                 /* TODO: initialize the SDVO */
 177 //              I830SDVOInit(pScrn, i, DVOC);
 178                 i++;
 179                 break;
 180         }
 181         dinfo->num_outputs = i;
 182 }
 183
 184 void intelfb_delete_i2c_busses(struct intelfb_info *dinfo)
 185 {
 186         int i;
 187
 188         for (i = 0; i < MAX_OUTPUTS; i++) {
 189                 if (dinfo->output[i].i2c_bus.dinfo) {
 190                         i2c_del_adapter(&dinfo->output[i].i2c_bus.adapter);
 191                         dinfo->output[i].i2c_bus.dinfo = NULL;
 192                 }
 193                 if (dinfo->output[i].ddc_bus.dinfo) {
 194                         i2c_del_adapter(&dinfo->output[i].ddc_bus.adapter);
 195                         dinfo->output[i].ddc_bus.dinfo = NULL;
 196                 }
 197         }
 198 }