1 /*
2 * linux/drivers/video/riva/fbdev-i2c.c - nVidia i2c
3 *
4 * Maintained by Ani Joshi <ajoshi@shell.unixbox.com>
5 *
6 * Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
7 *
8 * Based on radeonfb-i2c.c
9 *
10 * This file is subject to the terms and conditions of the GNU General Public
11 * License. See the file COPYING in the main directory of this archive
12 * for more details.
13 */
14
15 #include <linux/config.h>
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/sched.h>
19 #include <linux/delay.h>
20 #include <linux/pci.h>
21 #include <linux/fb.h>
22 #include <linux/jiffies.h>
23
24 #include <asm/io.h>
25
26 #include "rivafb.h"
27 #include "../edid.h"
28
29 #define RIVA_DDC 0x50
30
31 static void riva_gpio_setscl(void* data, int state)
32 {
33 struct riva_i2c_chan *chan = (struct riva_i2c_chan *)data;
34 struct riva_par *par = chan->par;
35 u32 val;
36
37 VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
38 val = VGA_RD08(par->riva.PCIO, 0x3d5) & 0xf0;
39
40 if (state)
41 val |= 0x20;
42 else
43 val &= ~0x20;
44
45 VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
46 VGA_WR08(par->riva.PCIO, 0x3d5, val | 0x1);
47 }
48
49 static void riva_gpio_setsda(void* data, int state)
50 {
51 struct riva_i2c_chan *chan = (struct riva_i2c_chan *)data;
52 struct riva_par *par = chan->par;
53 u32 val;
54
55 VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
56 val = VGA_RD08(par->riva.PCIO, 0x3d5) & 0xf0;
57
58 if (state)
59 val |= 0x10;
60 else
61 val &= ~0x10;
62
63 VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
64 VGA_WR08(par->riva.PCIO, 0x3d5, val | 0x1);
65 }
66
67 static int riva_gpio_getscl(void* data)
68 {
69 struct riva_i2c_chan *chan = (struct riva_i2c_chan *)data;
70 struct riva_par *par = chan->par;
71 u32 val = 0;
72
73 VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base);
74 if (VGA_RD08(par->riva.PCIO, 0x3d5) & 0x04)
75 val = 1;
76
77 val = VGA_RD08(par->riva.PCIO, 0x3d5);
78
79 return val;
80 }
81
82 static int riva_gpio_getsda(void* data)
83 {
84 struct riva_i2c_chan *chan = (struct riva_i2c_chan *)data;
85 struct riva_par *par = chan->par;
86 u32 val = 0;
87
88 VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base);
89 if (VGA_RD08(par->riva.PCIO, 0x3d5) & 0x08)
90 val = 1;
91
92 return val;
93 }
94
95 #define I2C_ALGO_RIVA 0x0e0000
96 static int riva_setup_i2c_bus(struct riva_i2c_chan *chan, const char *name)
97 {
98 int rc;
99
100 strcpy(chan->adapter.name, name);
101 chan->adapter.owner = THIS_MODULE;
102 chan->adapter.id = I2C_ALGO_RIVA;
103 chan->adapter.algo_data = &chan->algo;
104 chan->adapter.dev.parent = &chan->par->pdev->dev;
105 chan->algo.setsda = riva_gpio_setsda;
106 chan->algo.setscl = riva_gpio_setscl;
107 chan->algo.getsda = riva_gpio_getsda;
108 chan->algo.getscl = riva_gpio_getscl;
109 chan->algo.udelay = 40;
110 chan->algo.timeout = msecs_to_jiffies(2);
111 chan->algo.data = chan;
112
113 i2c_set_adapdata(&chan->adapter, chan);
114
115 /* Raise SCL and SDA */
116 riva_gpio_setsda(chan, 1);
117 riva_gpio_setscl(chan, 1);
118 udelay(20);
119
120 rc = i2c_bit_add_bus(&chan->adapter);
121 if (rc == 0)
122 dev_dbg(&chan->par->pdev->dev, "I2C bus %s registered.\n", name);
123 else
124 dev_warn(&chan->par->pdev->dev, "Failed to register I2C bus %s.\n", name);
125 return rc;
126 }
127
128 void riva_create_i2c_busses(struct riva_par *par)
129 {
130 par->bus = 3;
131
132 par->chan[0].par = par;
133 par->chan[1].par = par;
134 par->chan[2].par = par;
135
136 par->chan[0].ddc_base = 0x3e;
137 par->chan[1].ddc_base = 0x36;
138 par->chan[2].ddc_base = 0x50;
139 riva_setup_i2c_bus(&par->chan[0], "BUS1");
140 riva_setup_i2c_bus(&par->chan[1], "BUS2");
141 riva_setup_i2c_bus(&par->chan[2], "BUS3");
142 }
143
144 void riva_delete_i2c_busses(struct riva_par *par)
145 {
146 if (par->chan[0].par)
147 i2c_bit_del_bus(&par->chan[0].adapter);
148 par->chan[0].par = NULL;
149
150 if (par->chan[1].par)
151 i2c_bit_del_bus(&par->chan[1].adapter);
152 par->chan[1].par = NULL;
153
154 if (par->chan[2].par)
155 i2c_bit_del_bus(&par->chan[2].adapter);
156 par->chan[2].par = NULL;
157 }
158
159 static u8 *riva_do_probe_i2c_edid(struct riva_i2c_chan *chan)
160 {
161 u8 start = 0x0;
162 struct i2c_msg msgs[] = {
163 {
164 .addr = RIVA_DDC,
165 .len = 1,
166 .buf = &start,
167 }, {
168 .addr = RIVA_DDC,
169 .flags = I2C_M_RD,
170 .len = EDID_LENGTH,
171 },
172 };
173 u8 *buf;
174
175 buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
176 if (!buf) {
177 dev_warn(&chan->par->pdev->dev, "Out of memory!\n");
178 return NULL;
179 }
180 msgs[1].buf = buf;
181
182 if (i2c_transfer(&chan->adapter, msgs, 2) == 2)
183 return buf;
184 dev_dbg(&chan->par->pdev->dev, "Unable to read EDID block.\n");
185 kfree(buf);
186 return NULL;
187 }
188
189 int riva_probe_i2c_connector(struct riva_par *par, int conn, u8 **out_edid)
190 {
191 u8 *edid = NULL;
192 int i;
193
194 for (i = 0; i < 3; i++) {
195 /* Do the real work */
196 edid = riva_do_probe_i2c_edid(&par->chan[conn-1]);
197 if (edid)
198 break;
199 }
200 if (out_edid)
201 *out_edid = edid;
202 if (!edid)
203 return 1;
204
205 return 0;
206 }
207
208
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