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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/video/i810/i810-i2c.c
2 * linux/drivers/video/i810-i2c.c -- Intel 810/815 I2C support
4 * Copyright (C) 2004 Antonino Daplas<adaplas@pol.net>
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file COPYING in the main directory of this archive for
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/delay.h>
14 #include <linux/pci.h>
17 #include "i810_regs.h"
18 #include "i810_main.h"
21 /* bit locations in the registers */
22 #define SCL_DIR_MASK 0x0001
23 #define SCL_DIR 0x0002
24 #define SCL_VAL_MASK 0x0004
25 #define SCL_VAL_OUT 0x0008
26 #define SCL_VAL_IN 0x0010
27 #define SDA_DIR_MASK 0x0100
28 #define SDA_DIR 0x0200
29 #define SDA_VAL_MASK 0x0400
30 #define SDA_VAL_OUT 0x0800
31 #define SDA_VAL_IN 0x1000
33 #define DEBUG /* define this for verbose EDID parsing output */
36 #define DPRINTK(fmt, args...) printk(fmt,## args)
38 #define DPRINTK(fmt, args...)
41 static void i810i2c_setscl(void *data
, int state
)
43 struct i810fb_i2c_chan
*chan
= data
;
44 struct i810fb_par
*par
= chan
->par
;
45 u8 __iomem
*mmio
= par
->mmio_start_virtual
;
47 i810_writel(mmio
, chan
->ddc_base
, (state
? SCL_VAL_OUT
: 0) | SCL_DIR
|
48 SCL_DIR_MASK
| SCL_VAL_MASK
);
49 i810_readl(mmio
, chan
->ddc_base
); /* flush posted write */
52 static void i810i2c_setsda(void *data
, int state
)
54 struct i810fb_i2c_chan
*chan
= data
;
55 struct i810fb_par
*par
= chan
->par
;
56 u8 __iomem
*mmio
= par
->mmio_start_virtual
;
58 i810_writel(mmio
, chan
->ddc_base
, (state
? SDA_VAL_OUT
: 0) | SDA_DIR
|
59 SDA_DIR_MASK
| SDA_VAL_MASK
);
60 i810_readl(mmio
, chan
->ddc_base
); /* flush posted write */
63 static int i810i2c_getscl(void *data
)
65 struct i810fb_i2c_chan
*chan
= data
;
66 struct i810fb_par
*par
= chan
->par
;
67 u8 __iomem
*mmio
= par
->mmio_start_virtual
;
69 i810_writel(mmio
, chan
->ddc_base
, SCL_DIR_MASK
);
70 i810_writel(mmio
, chan
->ddc_base
, 0);
71 return ((i810_readl(mmio
, chan
->ddc_base
) & SCL_VAL_IN
) != 0);
74 static int i810i2c_getsda(void *data
)
76 struct i810fb_i2c_chan
*chan
= data
;
77 struct i810fb_par
*par
= chan
->par
;
78 u8 __iomem
*mmio
= par
->mmio_start_virtual
;
80 i810_writel(mmio
, chan
->ddc_base
, SDA_DIR_MASK
);
81 i810_writel(mmio
, chan
->ddc_base
, 0);
82 return ((i810_readl(mmio
, chan
->ddc_base
) & SDA_VAL_IN
) != 0);
85 static int i810_setup_i2c_bus(struct i810fb_i2c_chan
*chan
, const char *name
)
89 strcpy(chan
->adapter
.name
, name
);
90 chan
->adapter
.owner
= THIS_MODULE
;
91 chan
->adapter
.algo_data
= &chan
->algo
;
92 chan
->adapter
.dev
.parent
= &chan
->par
->dev
->dev
;
93 chan
->adapter
.id
= I2C_HW_B_I810
;
94 chan
->algo
.setsda
= i810i2c_setsda
;
95 chan
->algo
.setscl
= i810i2c_setscl
;
96 chan
->algo
.getsda
= i810i2c_getsda
;
97 chan
->algo
.getscl
= i810i2c_getscl
;
98 chan
->algo
.udelay
= 10;
99 chan
->algo
.timeout
= (HZ
/2);
100 chan
->algo
.data
= chan
;
102 i2c_set_adapdata(&chan
->adapter
, chan
);
104 /* Raise SCL and SDA */
105 chan
->algo
.setsda(chan
, 1);
106 chan
->algo
.setscl(chan
, 1);
109 rc
= i2c_bit_add_bus(&chan
->adapter
);
112 dev_dbg(&chan
->par
->dev
->dev
, "I2C bus %s registered.\n",name
);
114 dev_warn(&chan
->par
->dev
->dev
, "Failed to register I2C bus "
122 void i810_create_i2c_busses(struct i810fb_par
*par
)
124 par
->chan
[0].par
= par
;
125 par
->chan
[1].par
= par
;
126 par
->chan
[2].par
= par
;
128 par
->chan
[0].ddc_base
= GPIOA
;
129 i810_setup_i2c_bus(&par
->chan
[0], "I810-DDC");
130 par
->chan
[1].ddc_base
= GPIOB
;
131 i810_setup_i2c_bus(&par
->chan
[1], "I810-I2C");
132 par
->chan
[2].ddc_base
= GPIOC
;
133 i810_setup_i2c_bus(&par
->chan
[2], "I810-GPIOC");
136 void i810_delete_i2c_busses(struct i810fb_par
*par
)
138 if (par
->chan
[0].par
)
139 i2c_del_adapter(&par
->chan
[0].adapter
);
140 par
->chan
[0].par
= NULL
;
142 if (par
->chan
[1].par
)
143 i2c_del_adapter(&par
->chan
[1].adapter
);
144 par
->chan
[1].par
= NULL
;
146 if (par
->chan
[2].par
)
147 i2c_del_adapter(&par
->chan
[2].adapter
);
148 par
->chan
[2].par
= NULL
;
151 int i810_probe_i2c_connector(struct fb_info
*info
, u8
**out_edid
, int conn
)
153 struct i810fb_par
*par
= info
->par
;
156 DPRINTK("i810-i2c: Probe DDC%i Bus\n", conn
+1);
157 if (conn
< par
->ddc_num
) {
158 edid
= fb_ddc_read(&par
->chan
[conn
].adapter
);
160 const u8
*e
= fb_firmware_edid(info
->device
);
163 DPRINTK("i810-i2c: Getting EDID from BIOS\n");
164 edid
= kmemdup(e
, EDID_LENGTH
, GFP_KERNEL
);
170 return (edid
) ? 0 : 1;