Merge branch 'wimax-2.6.35.y' of git://git.kernel.org/pub/scm/linux/kernel/git/inaky...
[pandora-kernel.git] / drivers / media / dvb / ngene / ngene-i2c.c
1 /*
2  * ngene-i2c.c: nGene PCIe bridge driver i2c functions
3  *
4  * Copyright (C) 2005-2007 Micronas
5  *
6  * Copyright (C) 2008-2009 Ralph Metzler <rjkm@metzlerbros.de>
7  *                         Modifications for new nGene firmware,
8  *                         support for EEPROM-copying,
9  *                         support for new dual DVB-S2 card prototype
10  *
11  *
12  * This program is free software; you can redistribute it and/or
13  * modify it under the terms of the GNU General Public License
14  * version 2 only, as published by the Free Software Foundation.
15  *
16  *
17  * This program is distributed in the hope that it will be useful,
18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  * GNU General Public License for more details.
21  *
22  *
23  * You should have received a copy of the GNU General Public License
24  * along with this program; if not, write to the Free Software
25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
26  * 02110-1301, USA
27  * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
28  */
29
30 /* FIXME - some of these can probably be removed */
31 #include <linux/module.h>
32 #include <linux/init.h>
33 #include <linux/delay.h>
34 #include <linux/slab.h>
35 #include <linux/poll.h>
36 #include <linux/io.h>
37 #include <asm/div64.h>
38 #include <linux/pci.h>
39 #include <linux/pci_ids.h>
40 #include <linux/smp_lock.h>
41 #include <linux/timer.h>
42 #include <linux/version.h>
43 #include <linux/byteorder/generic.h>
44 #include <linux/firmware.h>
45 #include <linux/vmalloc.h>
46
47 #include "ngene.h"
48
49 /* Firmware command for i2c operations */
50 static int ngene_command_i2c_read(struct ngene *dev, u8 adr,
51                            u8 *out, u8 outlen, u8 *in, u8 inlen, int flag)
52 {
53         struct ngene_command com;
54
55         com.cmd.hdr.Opcode = CMD_I2C_READ;
56         com.cmd.hdr.Length = outlen + 3;
57         com.cmd.I2CRead.Device = adr << 1;
58         memcpy(com.cmd.I2CRead.Data, out, outlen);
59         com.cmd.I2CRead.Data[outlen] = inlen;
60         com.cmd.I2CRead.Data[outlen + 1] = 0;
61         com.in_len = outlen + 3;
62         com.out_len = inlen + 1;
63
64         if (ngene_command(dev, &com) < 0)
65                 return -EIO;
66
67         if ((com.cmd.raw8[0] >> 1) != adr)
68                 return -EIO;
69
70         if (flag)
71                 memcpy(in, com.cmd.raw8, inlen + 1);
72         else
73                 memcpy(in, com.cmd.raw8 + 1, inlen);
74         return 0;
75 }
76
77 static int ngene_command_i2c_write(struct ngene *dev, u8 adr,
78                                    u8 *out, u8 outlen)
79 {
80         struct ngene_command com;
81
82
83         com.cmd.hdr.Opcode = CMD_I2C_WRITE;
84         com.cmd.hdr.Length = outlen + 1;
85         com.cmd.I2CRead.Device = adr << 1;
86         memcpy(com.cmd.I2CRead.Data, out, outlen);
87         com.in_len = outlen + 1;
88         com.out_len = 1;
89
90         if (ngene_command(dev, &com) < 0)
91                 return -EIO;
92
93         if (com.cmd.raw8[0] == 1)
94                 return -EIO;
95
96         return 0;
97 }
98
99 static void ngene_i2c_set_bus(struct ngene *dev, int bus)
100 {
101         if (!(dev->card_info->i2c_access & 2))
102                 return;
103         if (dev->i2c_current_bus == bus)
104                 return;
105
106         switch (bus) {
107         case 0:
108                 ngene_command_gpio_set(dev, 3, 0);
109                 ngene_command_gpio_set(dev, 2, 1);
110                 break;
111
112         case 1:
113                 ngene_command_gpio_set(dev, 2, 0);
114                 ngene_command_gpio_set(dev, 3, 1);
115                 break;
116         }
117         dev->i2c_current_bus = bus;
118 }
119
120 static int ngene_i2c_master_xfer(struct i2c_adapter *adapter,
121                                  struct i2c_msg msg[], int num)
122 {
123         struct ngene_channel *chan =
124                 (struct ngene_channel *)i2c_get_adapdata(adapter);
125         struct ngene *dev = chan->dev;
126
127         down(&dev->i2c_switch_mutex);
128         ngene_i2c_set_bus(dev, chan->number);
129
130         if (num == 2 && msg[1].flags & I2C_M_RD && !(msg[0].flags & I2C_M_RD))
131                 if (!ngene_command_i2c_read(dev, msg[0].addr,
132                                             msg[0].buf, msg[0].len,
133                                             msg[1].buf, msg[1].len, 0))
134                         goto done;
135
136         if (num == 1 && !(msg[0].flags & I2C_M_RD))
137                 if (!ngene_command_i2c_write(dev, msg[0].addr,
138                                              msg[0].buf, msg[0].len))
139                         goto done;
140         if (num == 1 && (msg[0].flags & I2C_M_RD))
141                 if (!ngene_command_i2c_read(dev, msg[0].addr, NULL, 0,
142                                             msg[0].buf, msg[0].len, 0))
143                         goto done;
144
145         up(&dev->i2c_switch_mutex);
146         return -EIO;
147
148 done:
149         up(&dev->i2c_switch_mutex);
150         return num;
151 }
152
153
154 static u32 ngene_i2c_functionality(struct i2c_adapter *adap)
155 {
156         return I2C_FUNC_SMBUS_EMUL;
157 }
158
159 static struct i2c_algorithm ngene_i2c_algo = {
160         .master_xfer = ngene_i2c_master_xfer,
161         .functionality = ngene_i2c_functionality,
162 };
163
164 int ngene_i2c_init(struct ngene *dev, int dev_nr)
165 {
166         struct i2c_adapter *adap = &(dev->channel[dev_nr].i2c_adapter);
167
168         i2c_set_adapdata(adap, &(dev->channel[dev_nr]));
169         adap->class = I2C_CLASS_TV_DIGITAL | I2C_CLASS_TV_ANALOG;
170
171         strcpy(adap->name, "nGene");
172
173         adap->algo = &ngene_i2c_algo;
174         adap->algo_data = (void *)&(dev->channel[dev_nr]);
175         adap->dev.parent = &dev->pci_dev->dev;
176
177         return i2c_add_adapter(adap);
178 }
179