2 * linux/drivers/video/riva/fbdev-i2c.c - nVidia i2c
4 * Maintained by Ani Joshi <ajoshi@shell.unixbox.com>
6 * Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
8 * Based on radeonfb-i2c.c
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
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/delay.h>
18 #include <linux/pci.h>
20 #include <linux/jiffies.h>
27 static void riva_gpio_setscl(void* data
, int state
)
29 struct riva_i2c_chan
*chan
= data
;
30 struct riva_par
*par
= chan
->par
;
33 VGA_WR08(par
->riva
.PCIO
, 0x3d4, chan
->ddc_base
+ 1);
34 val
= VGA_RD08(par
->riva
.PCIO
, 0x3d5) & 0xf0;
41 VGA_WR08(par
->riva
.PCIO
, 0x3d4, chan
->ddc_base
+ 1);
42 VGA_WR08(par
->riva
.PCIO
, 0x3d5, val
| 0x1);
45 static void riva_gpio_setsda(void* data
, int state
)
47 struct riva_i2c_chan
*chan
= data
;
48 struct riva_par
*par
= chan
->par
;
51 VGA_WR08(par
->riva
.PCIO
, 0x3d4, chan
->ddc_base
+ 1);
52 val
= VGA_RD08(par
->riva
.PCIO
, 0x3d5) & 0xf0;
59 VGA_WR08(par
->riva
.PCIO
, 0x3d4, chan
->ddc_base
+ 1);
60 VGA_WR08(par
->riva
.PCIO
, 0x3d5, val
| 0x1);
63 static int riva_gpio_getscl(void* data
)
65 struct riva_i2c_chan
*chan
= data
;
66 struct riva_par
*par
= chan
->par
;
69 VGA_WR08(par
->riva
.PCIO
, 0x3d4, chan
->ddc_base
);
70 if (VGA_RD08(par
->riva
.PCIO
, 0x3d5) & 0x04)
76 static int riva_gpio_getsda(void* data
)
78 struct riva_i2c_chan
*chan
= data
;
79 struct riva_par
*par
= chan
->par
;
82 VGA_WR08(par
->riva
.PCIO
, 0x3d4, chan
->ddc_base
);
83 if (VGA_RD08(par
->riva
.PCIO
, 0x3d5) & 0x08)
89 static int __devinit
riva_setup_i2c_bus(struct riva_i2c_chan
*chan
,
91 unsigned int i2c_class
)
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
;
109 i2c_set_adapdata(&chan
->adapter
, chan
);
111 /* Raise SCL and SDA */
112 riva_gpio_setsda(chan
, 1);
113 riva_gpio_setscl(chan
, 1);
116 rc
= i2c_bit_add_bus(&chan
->adapter
);
118 dev_dbg(&chan
->par
->pdev
->dev
, "I2C bus %s registered.\n", name
);
120 dev_warn(&chan
->par
->pdev
->dev
,
121 "Failed to register I2C bus %s.\n", name
);
128 void __devinit
riva_create_i2c_busses(struct riva_par
*par
)
130 par
->chan
[0].par
= par
;
131 par
->chan
[1].par
= par
;
132 par
->chan
[2].par
= par
;
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);
142 void riva_delete_i2c_busses(struct riva_par
*par
)
146 for (i
= 0; i
< 3; i
++) {
147 if (!par
->chan
[i
].par
)
149 i2c_del_adapter(&par
->chan
[i
].adapter
);
150 par
->chan
[i
].par
= NULL
;
154 int __devinit
riva_probe_i2c_connector(struct riva_par
*par
, int conn
, u8
**out_edid
)
158 if (par
->chan
[conn
].par
)
159 edid
= fb_ddc_read(&par
->chan
[conn
].adapter
);
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