Merge master.kernel.org:/pub/scm/linux/kernel/git/mchehab/v4l-dvb
[linux-2.6] / drivers / video / i810 / i810-i2c.c
1  /*-*- linux-c -*-
2  *  linux/drivers/video/i810-i2c.c -- Intel 810/815 I2C support
3  *
4  *      Copyright (C) 2004 Antonino Daplas<adaplas@pol.net>
5  *      All Rights Reserved
6  *
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
9  *  more details.
10  */
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/sched.h>
14 #include <linux/delay.h>
15 #include <linux/pci.h>
16 #include <linux/fb.h>
17 #include "i810.h"
18 #include "i810_regs.h"
19 #include "i810_main.h"
20 #include "../edid.h"
21
22 #define I810_DDC 0x50
23 /* bit locations in the registers */
24 #define SCL_DIR_MASK            0x0001
25 #define SCL_DIR                 0x0002
26 #define SCL_VAL_MASK            0x0004
27 #define SCL_VAL_OUT             0x0008
28 #define SCL_VAL_IN              0x0010
29 #define SDA_DIR_MASK            0x0100
30 #define SDA_DIR                 0x0200
31 #define SDA_VAL_MASK            0x0400
32 #define SDA_VAL_OUT             0x0800
33 #define SDA_VAL_IN              0x1000
34
35 #define DEBUG  /* define this for verbose EDID parsing output */
36
37 #ifdef DEBUG
38 #define DPRINTK(fmt, args...) printk(fmt,## args)
39 #else
40 #define DPRINTK(fmt, args...)
41 #endif
42
43 static void i810i2c_setscl(void *data, int state)
44 {
45         struct i810fb_i2c_chan    *chan = data;
46         struct i810fb_par         *par = chan->par;
47         u8                        __iomem *mmio = par->mmio_start_virtual;
48
49         i810_writel(mmio, chan->ddc_base, (state ? SCL_VAL_OUT : 0) | SCL_DIR |
50                     SCL_DIR_MASK | SCL_VAL_MASK);
51         i810_readl(mmio, chan->ddc_base);       /* flush posted write */
52 }
53
54 static void i810i2c_setsda(void *data, int state)
55 {
56         struct i810fb_i2c_chan    *chan = data;
57         struct i810fb_par         *par = chan->par;
58         u8                        __iomem *mmio = par->mmio_start_virtual;
59
60         i810_writel(mmio, chan->ddc_base, (state ? SDA_VAL_OUT : 0) | SDA_DIR |
61                     SDA_DIR_MASK | SDA_VAL_MASK);
62         i810_readl(mmio, chan->ddc_base);       /* flush posted write */
63 }
64
65 static int i810i2c_getscl(void *data)
66 {
67         struct i810fb_i2c_chan    *chan = data;
68         struct i810fb_par         *par = chan->par;
69         u8                        __iomem *mmio = par->mmio_start_virtual;
70
71         i810_writel(mmio, chan->ddc_base, SCL_DIR_MASK);
72         i810_writel(mmio, chan->ddc_base, 0);
73         return ((i810_readl(mmio, chan->ddc_base) & SCL_VAL_IN) != 0);
74 }
75
76 static int i810i2c_getsda(void *data)
77 {
78         struct i810fb_i2c_chan    *chan = data;
79         struct i810fb_par         *par = chan->par;
80         u8                        __iomem *mmio = par->mmio_start_virtual;
81
82         i810_writel(mmio, chan->ddc_base, SDA_DIR_MASK);
83         i810_writel(mmio, chan->ddc_base, 0);
84         return ((i810_readl(mmio, chan->ddc_base) & SDA_VAL_IN) != 0);
85 }
86
87 static int i810_setup_i2c_bus(struct i810fb_i2c_chan *chan, const char *name)
88 {
89         int rc;
90
91         strcpy(chan->adapter.name, name);
92         chan->adapter.owner             = THIS_MODULE;
93         chan->adapter.algo_data         = &chan->algo;
94         chan->adapter.dev.parent        = &chan->par->dev->dev;
95         chan->adapter.id                = I2C_HW_B_I810;
96         chan->algo.setsda               = i810i2c_setsda;
97         chan->algo.setscl               = i810i2c_setscl;
98         chan->algo.getsda               = i810i2c_getsda;
99         chan->algo.getscl               = i810i2c_getscl;
100         chan->algo.udelay               = 10;
101         chan->algo.timeout              = (HZ/2);
102         chan->algo.data                 = chan;
103
104         i2c_set_adapdata(&chan->adapter, chan);
105
106         /* Raise SCL and SDA */
107         chan->algo.setsda(chan, 1);
108         chan->algo.setscl(chan, 1);
109         udelay(20);
110
111         rc = i2c_bit_add_bus(&chan->adapter);
112
113         if (rc == 0)
114                 dev_dbg(&chan->par->dev->dev, "I2C bus %s registered.\n",name);
115         else {
116                 dev_warn(&chan->par->dev->dev, "Failed to register I2C bus "
117                          "%s.\n", name);
118                 chan->par = NULL;
119         }
120
121         return rc;
122 }
123
124 void i810_create_i2c_busses(struct i810fb_par *par)
125 {
126         par->chan[0].par        = par;
127         par->chan[1].par        = par;
128         par->chan[2].par        = par;
129
130         par->chan[0].ddc_base = GPIOA;
131         i810_setup_i2c_bus(&par->chan[0], "I810-DDC");
132         par->chan[1].ddc_base = GPIOB;
133         i810_setup_i2c_bus(&par->chan[1], "I810-I2C");
134         par->chan[2].ddc_base = GPIOC;
135         i810_setup_i2c_bus(&par->chan[2], "I810-GPIOC");
136 }
137
138 void i810_delete_i2c_busses(struct i810fb_par *par)
139 {
140         if (par->chan[0].par)
141                 i2c_bit_del_bus(&par->chan[0].adapter);
142         par->chan[0].par = NULL;
143
144         if (par->chan[1].par)
145                 i2c_bit_del_bus(&par->chan[1].adapter);
146         par->chan[1].par = NULL;
147
148         if (par->chan[2].par)
149                 i2c_bit_del_bus(&par->chan[2].adapter);
150         par->chan[2].par = NULL;
151 }
152
153 static u8 *i810_do_probe_i2c_edid(struct i810fb_i2c_chan *chan)
154 {
155         u8 start = 0x0;
156         struct i2c_msg msgs[] = {
157                 {
158                         .addr   = I810_DDC,
159                         .len    = 1,
160                         .buf    = &start,
161                 }, {
162                         .addr   = I810_DDC,
163                         .flags  = I2C_M_RD,
164                         .len    = EDID_LENGTH,
165                 },
166         };
167         u8 *buf;
168
169         buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
170         if (!buf) {
171                 DPRINTK("i810-i2c: Failed to allocate memory\n");
172                 return NULL;
173         }
174         msgs[1].buf = buf;
175
176         if (i2c_transfer(&chan->adapter, msgs, 2) == 2) {
177                 DPRINTK("i810-i2c: I2C Transfer successful\n");
178                 return buf;
179         }
180
181         DPRINTK("i810-i2c: Unable to read EDID block.\n");
182         kfree(buf);
183         return NULL;
184 }
185
186 int i810_probe_i2c_connector(struct fb_info *info, u8 **out_edid, int conn)
187 {
188         struct i810fb_par *par = info->par;
189         u8 *edid = NULL;
190         int i;
191
192         DPRINTK("i810-i2c: Probe DDC%i Bus\n", conn+1);
193         if (conn < par->ddc_num) {
194                 for (i = 0; i < 3; i++) {
195                         /* Do the real work */
196                         edid = i810_do_probe_i2c_edid(&par->chan[conn]);
197                         if (edid)
198                                 break;
199                 }
200         } else {
201                 const u8 *e = fb_firmware_edid(info->device);
202
203                 if (e != NULL) {
204                         DPRINTK("i810-i2c: Getting EDID from BIOS\n");
205                         edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
206                         if (edid)
207                                 memcpy(edid, e, EDID_LENGTH);
208                 }
209         }
210
211         *out_edid = edid;
212
213         return (edid) ? 0 : 1;
214 }