2 * linux/drivers/video/nvidia/nvidia-i2c.c - nVidia i2c
4 * Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
6 * Based on rivafb-i2c.c
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file COPYING in the main directory of this archive
13 #include <linux/config.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/sched.h>
17 #include <linux/delay.h>
18 #include <linux/pci.h>
29 static void nvidia_gpio_setscl(void *data, int state)
31 struct nvidia_i2c_chan *chan = data;
32 struct nvidia_par *par = chan->par;
35 VGA_WR08(par->PCIO, 0x3d4, chan->ddc_base + 1);
36 val = VGA_RD08(par->PCIO, 0x3d5) & 0xf0;
43 VGA_WR08(par->PCIO, 0x3d4, chan->ddc_base + 1);
44 VGA_WR08(par->PCIO, 0x3d5, val | 0x1);
47 static void nvidia_gpio_setsda(void *data, int state)
49 struct nvidia_i2c_chan *chan = (struct nvidia_i2c_chan *)data;
50 struct nvidia_par *par = chan->par;
53 VGA_WR08(par->PCIO, 0x3d4, chan->ddc_base + 1);
54 val = VGA_RD08(par->PCIO, 0x3d5) & 0xf0;
61 VGA_WR08(par->PCIO, 0x3d4, chan->ddc_base + 1);
62 VGA_WR08(par->PCIO, 0x3d5, val | 0x1);
65 static int nvidia_gpio_getscl(void *data)
67 struct nvidia_i2c_chan *chan = (struct nvidia_i2c_chan *)data;
68 struct nvidia_par *par = chan->par;
71 VGA_WR08(par->PCIO, 0x3d4, chan->ddc_base);
72 if (VGA_RD08(par->PCIO, 0x3d5) & 0x04)
75 val = VGA_RD08(par->PCIO, 0x3d5);
80 static int nvidia_gpio_getsda(void *data)
82 struct nvidia_i2c_chan *chan = (struct nvidia_i2c_chan *)data;
83 struct nvidia_par *par = chan->par;
86 VGA_WR08(par->PCIO, 0x3d4, chan->ddc_base);
87 if (VGA_RD08(par->PCIO, 0x3d5) & 0x08)
93 static int nvidia_setup_i2c_bus(struct nvidia_i2c_chan *chan, const char *name)
97 strcpy(chan->adapter.name, name);
98 chan->adapter.owner = THIS_MODULE;
99 chan->adapter.id = I2C_HW_B_NVIDIA;
100 chan->adapter.algo_data = &chan->algo;
101 chan->adapter.dev.parent = &chan->par->pci_dev->dev;
102 chan->algo.setsda = nvidia_gpio_setsda;
103 chan->algo.setscl = nvidia_gpio_setscl;
104 chan->algo.getsda = nvidia_gpio_getsda;
105 chan->algo.getscl = nvidia_gpio_getscl;
106 chan->algo.udelay = 40;
107 chan->algo.timeout = msecs_to_jiffies(2);
108 chan->algo.data = chan;
110 i2c_set_adapdata(&chan->adapter, chan);
112 /* Raise SCL and SDA */
113 nvidia_gpio_setsda(chan, 1);
114 nvidia_gpio_setscl(chan, 1);
117 rc = i2c_bit_add_bus(&chan->adapter);
119 dev_dbg(&chan->par->pci_dev->dev,
120 "I2C bus %s registered.\n", name);
122 dev_warn(&chan->par->pci_dev->dev,
123 "Failed to register I2C bus %s.\n", name);
130 void nvidia_create_i2c_busses(struct nvidia_par *par)
134 par->chan[0].par = par;
135 par->chan[1].par = par;
136 par->chan[2].par = par;
138 par->chan[0].ddc_base = 0x3e;
139 nvidia_setup_i2c_bus(&par->chan[0], "BUS1");
141 par->chan[1].ddc_base = 0x36;
142 nvidia_setup_i2c_bus(&par->chan[1], "BUS2");
144 par->chan[2].ddc_base = 0x50;
145 nvidia_setup_i2c_bus(&par->chan[2], "BUS3");
148 void nvidia_delete_i2c_busses(struct nvidia_par *par)
150 if (par->chan[0].par)
151 i2c_bit_del_bus(&par->chan[0].adapter);
152 par->chan[0].par = NULL;
154 if (par->chan[1].par)
155 i2c_bit_del_bus(&par->chan[1].adapter);
156 par->chan[1].par = NULL;
158 if (par->chan[2].par)
159 i2c_bit_del_bus(&par->chan[2].adapter);
160 par->chan[2].par = NULL;
164 static u8 *nvidia_do_probe_i2c_edid(struct nvidia_i2c_chan *chan)
167 struct i2c_msg msgs[] = {
183 buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
185 dev_warn(&chan->par->pci_dev->dev, "Out of memory!\n");
190 if (i2c_transfer(&chan->adapter, msgs, 2) == 2)
192 dev_dbg(&chan->par->pci_dev->dev, "Unable to read EDID block.\n");
197 int nvidia_probe_i2c_connector(struct fb_info *info, int conn, u8 **out_edid)
199 struct nvidia_par *par = info->par;
203 for (i = 0; i < 3; i++) {
204 /* Do the real work */
205 edid = nvidia_do_probe_i2c_edid(&par->chan[conn - 1]);
210 if (!edid && conn == 1) {
211 /* try to get from firmware */
212 const u8 *e = fb_firmware_edid(info->device);
215 edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
217 memcpy(edid, e, EDID_LENGTH);
224 return (edid) ? 0 : 1;