172 lines · c
1/*2 * linux/drivers/video/nvidia/nvidia-i2c.c - nVidia i2c3 *4 * Copyright 2004 Antonino A. Daplas <adaplas @pol.net>5 *6 * Based on rivafb-i2c.c7 *8 * This file is subject to the terms and conditions of the GNU General Public9 * License. See the file COPYING in the main directory of this archive10 * for more details.11 */12 13#include <linux/module.h>14#include <linux/kernel.h>15#include <linux/delay.h>16#include <linux/gfp.h>17#include <linux/pci.h>18#include <linux/fb.h>19 20#include <asm/io.h>21 22#include "nv_type.h"23#include "nv_local.h"24#include "nv_proto.h"25 26#include "../edid.h"27 28static void nvidia_gpio_setscl(void *data, int state)29{30 struct nvidia_i2c_chan *chan = data;31 struct nvidia_par *par = chan->par;32 u32 val;33 34 val = NVReadCrtc(par, chan->ddc_base + 1) & 0xf0;35 36 if (state)37 val |= 0x20;38 else39 val &= ~0x20;40 41 NVWriteCrtc(par, chan->ddc_base + 1, val | 0x01);42}43 44static void nvidia_gpio_setsda(void *data, int state)45{46 struct nvidia_i2c_chan *chan = data;47 struct nvidia_par *par = chan->par;48 u32 val;49 50 val = NVReadCrtc(par, chan->ddc_base + 1) & 0xf0;51 52 if (state)53 val |= 0x10;54 else55 val &= ~0x10;56 57 NVWriteCrtc(par, chan->ddc_base + 1, val | 0x01);58}59 60static int nvidia_gpio_getscl(void *data)61{62 struct nvidia_i2c_chan *chan = data;63 struct nvidia_par *par = chan->par;64 u32 val = 0;65 66 if (NVReadCrtc(par, chan->ddc_base) & 0x04)67 val = 1;68 69 return val;70}71 72static int nvidia_gpio_getsda(void *data)73{74 struct nvidia_i2c_chan *chan = data;75 struct nvidia_par *par = chan->par;76 u32 val = 0;77 78 if (NVReadCrtc(par, chan->ddc_base) & 0x08)79 val = 1;80 81 return val;82}83 84static int nvidia_setup_i2c_bus(struct nvidia_i2c_chan *chan, const char *name,85 unsigned int i2c_class)86{87 int rc;88 89 strscpy(chan->adapter.name, name, sizeof(chan->adapter.name));90 chan->adapter.owner = THIS_MODULE;91 chan->adapter.class = i2c_class;92 chan->adapter.algo_data = &chan->algo;93 chan->adapter.dev.parent = &chan->par->pci_dev->dev;94 chan->algo.setsda = nvidia_gpio_setsda;95 chan->algo.setscl = nvidia_gpio_setscl;96 chan->algo.getsda = nvidia_gpio_getsda;97 chan->algo.getscl = nvidia_gpio_getscl;98 chan->algo.udelay = 40;99 chan->algo.timeout = msecs_to_jiffies(2);100 chan->algo.data = chan;101 102 i2c_set_adapdata(&chan->adapter, chan);103 104 /* Raise SCL and SDA */105 nvidia_gpio_setsda(chan, 1);106 nvidia_gpio_setscl(chan, 1);107 udelay(20);108 109 rc = i2c_bit_add_bus(&chan->adapter);110 if (rc == 0)111 dev_dbg(&chan->par->pci_dev->dev,112 "I2C bus %s registered.\n", name);113 else {114 dev_warn(&chan->par->pci_dev->dev,115 "Failed to register I2C bus %s.\n", name);116 chan->par = NULL;117 }118 119 return rc;120}121 122void nvidia_create_i2c_busses(struct nvidia_par *par)123{124 par->chan[0].par = par;125 par->chan[1].par = par;126 par->chan[2].par = par;127 128 par->chan[0].ddc_base = (par->reverse_i2c) ? 0x36 : 0x3e;129 nvidia_setup_i2c_bus(&par->chan[0], "nvidia #0",130 (par->reverse_i2c) ? I2C_CLASS_HWMON : 0);131 132 par->chan[1].ddc_base = (par->reverse_i2c) ? 0x3e : 0x36;133 nvidia_setup_i2c_bus(&par->chan[1], "nvidia #1",134 (par->reverse_i2c) ? 0 : I2C_CLASS_HWMON);135 136 par->chan[2].ddc_base = 0x50;137 nvidia_setup_i2c_bus(&par->chan[2], "nvidia #2", 0);138}139 140void nvidia_delete_i2c_busses(struct nvidia_par *par)141{142 int i;143 144 for (i = 0; i < 3; i++) {145 if (!par->chan[i].par)146 continue;147 i2c_del_adapter(&par->chan[i].adapter);148 par->chan[i].par = NULL;149 }150}151 152int nvidia_probe_i2c_connector(struct fb_info *info, int conn, u8 **out_edid)153{154 struct nvidia_par *par = info->par;155 u8 *edid = NULL;156 157 if (par->chan[conn - 1].par)158 edid = fb_ddc_read(&par->chan[conn - 1].adapter);159 160 if (!edid && conn == 1) {161 /* try to get from firmware */162 const u8 *e = fb_firmware_edid(info->device);163 164 if (e != NULL)165 edid = kmemdup(e, EDID_LENGTH, GFP_KERNEL);166 }167 168 *out_edid = edid;169 170 return (edid) ? 0 : 1;171}172