/* * linux/drivers/video/nvidia/nvidia-i2c.c - nVidia i2c * * Copyright 2004 Antonino A. Daplas <adaplas @pol.net> * * Based on rivafb-i2c.c * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive * for more details. */ #include <linux/config.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/delay.h> #include <linux/pci.h> #include <linux/fb.h> #include <asm/io.h> #include "nv_type.h" #include "nv_local.h" #include "nv_proto.h" #include "../edid.h" static void nvidia_gpio_setscl(void *data, int state) { struct nvidia_i2c_chan *chan = data; struct nvidia_par *par = chan->par; u32 val; VGA_WR08(par->PCIO, 0x3d4, chan->ddc_base + 1); val = VGA_RD08(par->PCIO, 0x3d5) & 0xf0; if (state) val |= 0x20; else val &= ~0x20; VGA_WR08(par->PCIO, 0x3d4, chan->ddc_base + 1); VGA_WR08(par->PCIO, 0x3d5, val | 0x1); } static void nvidia_gpio_setsda(void *data, int state) { struct nvidia_i2c_chan *chan = (struct nvidia_i2c_chan *)data; struct nvidia_par *par = chan->par; u32 val; VGA_WR08(par->PCIO, 0x3d4, chan->ddc_base + 1); val = VGA_RD08(par->PCIO, 0x3d5) & 0xf0; if (state) val |= 0x10; else val &= ~0x10; VGA_WR08(par->PCIO, 0x3d4, chan->ddc_base + 1); VGA_WR08(par->PCIO, 0x3d5, val | 0x1); } static int nvidia_gpio_getscl(void *data) { struct nvidia_i2c_chan *chan = (struct nvidia_i2c_chan *)data; struct nvidia_par *par = chan->par; u32 val = 0; VGA_WR08(par->PCIO, 0x3d4, chan->ddc_base); if (VGA_RD08(par->PCIO, 0x3d5) & 0x04) val = 1; val = VGA_RD08(par->PCIO, 0x3d5); return val; } static int nvidia_gpio_getsda(void *data) { struct nvidia_i2c_chan *chan = (struct nvidia_i2c_chan *)data; struct nvidia_par *par = chan->par; u32 val = 0; VGA_WR08(par->PCIO, 0x3d4, chan->ddc_base); if (VGA_RD08(par->PCIO, 0x3d5) & 0x08) val = 1; return val; } #define I2C_ALGO_NVIDIA 0x0e0000 static int nvidia_setup_i2c_bus(struct nvidia_i2c_chan *chan, const char *name) { int rc; strcpy(chan->adapter.name, name); chan->adapter.owner = THIS_MODULE; chan->adapter.id = I2C_ALGO_NVIDIA; chan->adapter.algo_data = &chan->algo; chan->adapter.dev.parent = &chan->par->pci_dev->dev; chan->algo.setsda = nvidia_gpio_setsda; chan->algo.setscl = nvidia_gpio_setscl; chan->algo.getsda = nvidia_gpio_getsda; chan->algo.getscl = nvidia_gpio_getscl; chan->algo.udelay = 40; chan->algo.timeout = msecs_to_jiffies(2); chan->algo.data = chan; i2c_set_adapdata(&chan->adapter, chan); /* Raise SCL and SDA */ nvidia_gpio_setsda(chan, 1); nvidia_gpio_setscl(chan, 1); udelay(20); rc = i2c_bit_add_bus(&chan->adapter); if (rc == 0) dev_dbg(&chan->par->pci_dev->dev, "I2C bus %s registered.\n", name); else { dev_warn(&chan->par->pci_dev->dev, "Failed to register I2C bus %s.\n", name); chan->par = NULL; } return rc; } void nvidia_create_i2c_busses(struct nvidia_par *par) { par->bus = 3; par->chan[0].par = par; par->chan[1].par = par; par->chan[2].par = par; par->chan[0].ddc_base = 0x3e; nvidia_setup_i2c_bus(&par->chan[0], "BUS1"); par->chan[1].ddc_base = 0x36; nvidia_setup_i2c_bus(&par->chan[1], "BUS2"); par->chan[2].ddc_base = 0x50; nvidia_setup_i2c_bus(&par->chan[2], "BUS3"); } void nvidia_delete_i2c_busses(struct nvidia_par *par) { if (par->chan[0].par) i2c_bit_del_bus(&par->chan[0].adapter); par->chan[0].par = NULL; if (par->chan[1].par) i2c_bit_del_bus(&par->chan[1].adapter); par->chan[1].par = NULL; if (par->chan[2].par) i2c_bit_del_bus(&par->chan[2].adapter); par->chan[2].par = NULL; } static u8 *nvidia_do_probe_i2c_edid(struct nvidia_i2c_chan *chan) { u8 start = 0x0; struct i2c_msg msgs[] = { { .addr = 0x50, .len = 1, .buf = &start, }, { .addr = 0x50, .flags = I2C_M_RD, .len = EDID_LENGTH, }, }; u8 *buf; if (!chan->par) return NULL; buf = kmalloc(EDID_LENGTH, GFP_KERNEL); if (!buf) { dev_warn(&chan->par->pci_dev->dev, "Out of memory!\n"); return NULL; } msgs[1].buf = buf; if (i2c_transfer(&chan->adapter, msgs, 2) == 2) return buf; dev_dbg(&chan->par->pci_dev->dev, "Unable to read EDID block.\n"); kfree(buf); return NULL; } int nvidia_probe_i2c_connector(struct nvidia_par *par, int conn, u8 **out_edid) { u8 *edid = NULL; int i; for (i = 0; i < 3; i++) { /* Do the real work */ edid = nvidia_do_probe_i2c_edid(&par->chan[conn - 1]); if (edid) break; } if (out_edid) *out_edid = edid; if (!edid) return 1; return 0; }