Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hskinnemoen...
[linux-2.6] / drivers / video / riva / rivafb-i2c.c
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/module.h>
16 #include <linux/kernel.h>
17 #include <linux/delay.h>
18 #include <linux/pci.h>
19 #include <linux/fb.h>
20 #include <linux/jiffies.h>
21
22 #include <asm/io.h>
23
24 #include "rivafb.h"
25 #include "../edid.h"
26
27 static void riva_gpio_setscl(void* data, int state)
28 {
29         struct riva_i2c_chan    *chan = data;
30         struct riva_par         *par = chan->par;
31         u32                     val;
32
33         VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
34         val = VGA_RD08(par->riva.PCIO, 0x3d5) & 0xf0;
35
36         if (state)
37                 val |= 0x20;
38         else
39                 val &= ~0x20;
40
41         VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
42         VGA_WR08(par->riva.PCIO, 0x3d5, val | 0x1);
43 }
44
45 static void riva_gpio_setsda(void* data, int state)
46 {
47         struct riva_i2c_chan    *chan = data;
48         struct riva_par         *par = chan->par;
49         u32                     val;
50
51         VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
52         val = VGA_RD08(par->riva.PCIO, 0x3d5) & 0xf0;
53
54         if (state)
55                 val |= 0x10;
56         else
57                 val &= ~0x10;
58
59         VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
60         VGA_WR08(par->riva.PCIO, 0x3d5, val | 0x1);
61 }
62
63 static int riva_gpio_getscl(void* data)
64 {
65         struct riva_i2c_chan    *chan = data;
66         struct riva_par         *par = chan->par;
67         u32                     val = 0;
68
69         VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base);
70         if (VGA_RD08(par->riva.PCIO, 0x3d5) & 0x04)
71                 val = 1;
72
73         return val;
74 }
75
76 static int riva_gpio_getsda(void* data)
77 {
78         struct riva_i2c_chan    *chan = data;
79         struct riva_par         *par = chan->par;
80         u32                     val = 0;
81
82         VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base);
83         if (VGA_RD08(par->riva.PCIO, 0x3d5) & 0x08)
84                 val = 1;
85
86         return val;
87 }
88
89 static int __devinit riva_setup_i2c_bus(struct riva_i2c_chan *chan,
90                                         const char *name,
91                                         unsigned int i2c_class)
92 {
93         int rc;
94
95         strcpy(chan->adapter.name, name);
96         chan->adapter.owner             = THIS_MODULE;
97         chan->adapter.id                = I2C_HW_B_RIVA;
98         chan->adapter.class             = i2c_class;
99         chan->adapter.algo_data         = &chan->algo;
100         chan->adapter.dev.parent        = &chan->par->pdev->dev;
101         chan->algo.setsda               = riva_gpio_setsda;
102         chan->algo.setscl               = riva_gpio_setscl;
103         chan->algo.getsda               = riva_gpio_getsda;
104         chan->algo.getscl               = riva_gpio_getscl;
105         chan->algo.udelay               = 40;
106         chan->algo.timeout              = msecs_to_jiffies(2);
107         chan->algo.data                 = chan;
108
109         i2c_set_adapdata(&chan->adapter, chan);
110
111         /* Raise SCL and SDA */
112         riva_gpio_setsda(chan, 1);
113         riva_gpio_setscl(chan, 1);
114         udelay(20);
115
116         rc = i2c_bit_add_bus(&chan->adapter);
117         if (rc == 0)
118                 dev_dbg(&chan->par->pdev->dev, "I2C bus %s registered.\n", name);
119         else {
120                 dev_warn(&chan->par->pdev->dev,
121                          "Failed to register I2C bus %s.\n", name);
122                 chan->par = NULL;
123         }
124
125         return rc;
126 }
127
128 void __devinit riva_create_i2c_busses(struct riva_par *par)
129 {
130         par->chan[0].par        = par;
131         par->chan[1].par        = par;
132         par->chan[2].par        = par;
133
134         par->chan[0].ddc_base = 0x36;
135         par->chan[1].ddc_base = 0x3e;
136         par->chan[2].ddc_base = 0x50;
137         riva_setup_i2c_bus(&par->chan[0], "BUS1", I2C_CLASS_HWMON);
138         riva_setup_i2c_bus(&par->chan[1], "BUS2", 0);
139         riva_setup_i2c_bus(&par->chan[2], "BUS3", 0);
140 }
141
142 void riva_delete_i2c_busses(struct riva_par *par)
143 {
144         int i;
145
146         for (i = 0; i < 3; i++) {
147                 if (!par->chan[i].par)
148                         continue;
149                 i2c_del_adapter(&par->chan[i].adapter);
150                 par->chan[i].par = NULL;
151         }
152 }
153
154 int __devinit riva_probe_i2c_connector(struct riva_par *par, int conn, u8 **out_edid)
155 {
156         u8 *edid = NULL;
157
158         if (par->chan[conn].par)
159                 edid = fb_ddc_read(&par->chan[conn].adapter);
160
161         if (out_edid)
162                 *out_edid = edid;
163         if (!edid)
164                 return 1;
165
166         return 0;
167 }
168