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) | SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK); 62 val = INREG(chan->reg); 63} 64 65static 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 75static 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 87static 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 99static 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, sizeof(chan->adapter.name), 108 "intelfb %s", name); 109 chan->adapter.owner = THIS_MODULE; 110 chan->adapter.id = I2C_HW_B_INTELFB; 111 chan->adapter.algo_data = &chan->algo; 112 chan->adapter.dev.parent = &chan->dinfo->pdev->dev; 113 chan->algo.setsda = intelfb_gpio_setsda; 114 chan->algo.setscl = intelfb_gpio_setscl; 115 chan->algo.getsda = intelfb_gpio_getsda; 116 chan->algo.getscl = intelfb_gpio_getscl; 117 chan->algo.udelay = 40; 118 chan->algo.timeout = 20; 119 chan->algo.data = chan; 120 121 i2c_set_adapdata(&chan->adapter, chan); 122 123 /* Raise SCL and SDA */ 124 intelfb_gpio_setsda(chan, 1); 125 intelfb_gpio_setscl(chan, 1); 126 udelay(20); 127 128 rc = i2c_bit_add_bus(&chan->adapter); 129 if (rc == 0) 130 DBG_MSG("I2C bus %s registered.\n", name); 131 else 132 WRN_MSG("Failed to register I2C bus %s.\n", name); 133 return rc; 134} 135 136void intelfb_create_i2c_busses(struct intelfb_info *dinfo) 137{ 138 int i = 0; 139 140 /* everyone has at least a single analog output */ 141 dinfo->num_outputs = 1; 142 dinfo->output[i].type = INTELFB_OUTPUT_ANALOG; 143 144 /* setup the DDC bus for analog output */ 145 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus, GPIOA, "CRTDDC_A"); 146 i++; 147 148 /* need to add the output busses for each device 149 - this function is very incomplete 150 - i915GM has LVDS and TVOUT for example 151 */ 152 switch(dinfo->chipset) { 153 case INTEL_830M: 154 case INTEL_845G: 155 case INTEL_855GM: 156 case INTEL_865G: 157 dinfo->output[i].type = INTELFB_OUTPUT_DVO; 158 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus, GPIOD, "DVODDC_D"); 159 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus, GPIOE, "DVOI2C_E"); 160 i++; 161 break; 162 case INTEL_915G: 163 case INTEL_915GM: 164 /* has some LVDS + tv-out */ 165 case INTEL_945G: 166 case INTEL_945GM: 167 /* SDVO ports have a single control bus - 2 devices */ 168 dinfo->output[i].type = INTELFB_OUTPUT_SDVO; 169 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus, GPIOE, "SDVOCTRL_E"); 170 /* TODO: initialize the SDVO */ 171// I830SDVOInit(pScrn, i, DVOB); 172 i++; 173 174 /* set up SDVOC */ 175 dinfo->output[i].type = INTELFB_OUTPUT_SDVO; 176 dinfo->output[i].i2c_bus = dinfo->output[i - 1].i2c_bus; 177 /* TODO: initialize the SDVO */ 178// I830SDVOInit(pScrn, i, DVOC); 179 i++; 180 break; 181 } 182 dinfo->num_outputs = i; 183} 184 185void intelfb_delete_i2c_busses(struct intelfb_info *dinfo) 186{ 187 int i; 188 189 for (i = 0; i < MAX_OUTPUTS; i++) { 190 if (dinfo->output[i].i2c_bus.dinfo) { 191 i2c_del_adapter(&dinfo->output[i].i2c_bus.adapter); 192 dinfo->output[i].i2c_bus.dinfo = NULL; 193 } 194 if (dinfo->output[i].ddc_bus.dinfo) { 195 i2c_del_adapter(&dinfo->output[i].ddc_bus.adapter); 196 dinfo->output[i].ddc_bus.dinfo = NULL; 197 } 198 } 199} 200