1/************************************************************************** 2 3 Copyright 2006 Dave Airlie <airlied@linux.ie> 4 5All Rights Reserved. 6 7Permission is hereby granted, free of charge, to any person obtaining a 8copy of this software and associated documentation files (the "Software"), 9to deal in the Software without restriction, including without limitation 10on the rights to use, copy, modify, merge, publish, distribute, sub 11license, and/or sell copies of the Software, and to permit persons to whom 12the Software is furnished to do so, subject to the following conditions: 13 14The above copyright notice and this permission notice (including the next 15paragraph) shall be included in all copies or substantial portions of the 16Software. 17 18THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 21THE COPYRIGHT HOLDERS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM, 22DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 23OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 24USE 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 55static 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 66static 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 77static 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 89static 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 101static 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.algo_data = &chan->algo; 115 chan->adapter.dev.parent = &chan->dinfo->pdev->dev; 116 chan->algo.setsda = intelfb_gpio_setsda; 117 chan->algo.setscl = intelfb_gpio_setscl; 118 chan->algo.getsda = intelfb_gpio_getsda; 119 chan->algo.getscl = intelfb_gpio_getscl; 120 chan->algo.udelay = 40; 121 chan->algo.timeout = 20; 122 chan->algo.data = chan; 123 124 i2c_set_adapdata(&chan->adapter, chan); 125 126 /* Raise SCL and SDA */ 127 intelfb_gpio_setsda(chan, 1); 128 intelfb_gpio_setscl(chan, 1); 129 udelay(20); 130 131 rc = i2c_bit_add_bus(&chan->adapter); 132 if (rc == 0) 133 DBG_MSG("I2C bus %s registered.\n", name); 134 else 135 WRN_MSG("Failed to register I2C bus %s.\n", name); 136 return rc; 137} 138 139void intelfb_create_i2c_busses(struct intelfb_info *dinfo) 140{ 141 int i = 0; 142 143 /* everyone has at least a single analog output */ 144 dinfo->num_outputs = 1; 145 dinfo->output[i].type = INTELFB_OUTPUT_ANALOG; 146 147 /* setup the DDC bus for analog output */ 148 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus, GPIOA, 149 "CRTDDC_A", I2C_CLASS_DDC); 150 i++; 151 152 /* need to add the output busses for each device 153 - this function is very incomplete 154 - i915GM has LVDS and TVOUT for example 155 */ 156 switch(dinfo->chipset) { 157 case INTEL_830M: 158 case INTEL_845G: 159 case INTEL_854: 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 196void 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} 211