Merge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
[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/byteorder/generic.h>
43 #include <linux/firmware.h>
44 #include <linux/vmalloc.h>
45
46 #include "ngene.h"
47
48 /* Firmware command for i2c operations */
49 static int ngene_command_i2c_read(struct ngene *dev, u8 adr,
50                            u8 *out, u8 outlen, u8 *in, u8 inlen, int flag)
51 {
52         struct ngene_command com;
53
54         com.cmd.hdr.Opcode = CMD_I2C_READ;
55         com.cmd.hdr.Length = outlen + 3;
56         com.cmd.I2CRead.Device = adr << 1;
57         memcpy(com.cmd.I2CRead.Data, out, outlen);
58         com.cmd.I2CRead.Data[outlen] = inlen;
59         com.cmd.I2CRead.Data[outlen + 1] = 0;
60         com.in_len = outlen + 3;
61         com.out_len = inlen + 1;
62
63         if (ngene_command(dev, &com) < 0)
64                 return -EIO;
65
66         if ((com.cmd.raw8[0] >> 1) != adr)
67                 return -EIO;
68
69         if (flag)
70                 memcpy(in, com.cmd.raw8, inlen + 1);
71         else
72                 memcpy(in, com.cmd.raw8 + 1, inlen);
73         return 0;
74 }
75
76 static int ngene_command_i2c_write(struct ngene *dev, u8 adr,
77                                    u8 *out, u8 outlen)
78 {
79         struct ngene_command com;
80
81
82         com.cmd.hdr.Opcode = CMD_I2C_WRITE;
83         com.cmd.hdr.Length = outlen + 1;
84         com.cmd.I2CRead.Device = adr << 1;
85         memcpy(com.cmd.I2CRead.Data, out, outlen);
86         com.in_len = outlen + 1;
87         com.out_len = 1;
88
89         if (ngene_command(dev, &com) < 0)
90                 return -EIO;
91
92         if (com.cmd.raw8[0] == 1)
93                 return -EIO;
94
95         return 0;
96 }
97
98 static void ngene_i2c_set_bus(struct ngene *dev, int bus)
99 {
100         if (!(dev->card_info->i2c_access & 2))
101                 return;
102         if (dev->i2c_current_bus == bus)
103                 return;
104
105         switch (bus) {
106         case 0:
107                 ngene_command_gpio_set(dev, 3, 0);
108                 ngene_command_gpio_set(dev, 2, 1);
109                 break;
110
111         case 1:
112                 ngene_command_gpio_set(dev, 2, 0);
113                 ngene_command_gpio_set(dev, 3, 1);
114                 break;
115         }
116         dev->i2c_current_bus = bus;
117 }
118
119 static int ngene_i2c_master_xfer(struct i2c_adapter *adapter,
120                                  struct i2c_msg msg[], int num)
121 {
122         struct ngene_channel *chan =
123                 (struct ngene_channel *)i2c_get_adapdata(adapter);
124         struct ngene *dev = chan->dev;
125
126         down(&dev->i2c_switch_mutex);
127         ngene_i2c_set_bus(dev, chan->number);
128
129         if (num == 2 && msg[1].flags & I2C_M_RD && !(msg[0].flags & I2C_M_RD))
130                 if (!ngene_command_i2c_read(dev, msg[0].addr,
131                                             msg[0].buf, msg[0].len,
132                                             msg[1].buf, msg[1].len, 0))
133                         goto done;
134
135         if (num == 1 && !(msg[0].flags & I2C_M_RD))
136                 if (!ngene_command_i2c_write(dev, msg[0].addr,
137                                              msg[0].buf, msg[0].len))
138                         goto done;
139         if (num == 1 && (msg[0].flags & I2C_M_RD))
140                 if (!ngene_command_i2c_read(dev, msg[0].addr, NULL, 0,
141                                             msg[0].buf, msg[0].len, 0))
142                         goto done;
143
144         up(&dev->i2c_switch_mutex);
145         return -EIO;
146
147 done:
148         up(&dev->i2c_switch_mutex);
149         return num;
150 }
151
152
153 static u32 ngene_i2c_functionality(struct i2c_adapter *adap)
154 {
155         return I2C_FUNC_SMBUS_EMUL;
156 }
157
158 static struct i2c_algorithm ngene_i2c_algo = {
159         .master_xfer = ngene_i2c_master_xfer,
160         .functionality = ngene_i2c_functionality,
161 };
162
163 int ngene_i2c_init(struct ngene *dev, int dev_nr)
164 {
165         struct i2c_adapter *adap = &(dev->channel[dev_nr].i2c_adapter);
166
167         i2c_set_adapdata(adap, &(dev->channel[dev_nr]));
168
169         strcpy(adap->name, "nGene");
170
171         adap->algo = &ngene_i2c_algo;
172         adap->algo_data = (void *)&(dev->channel[dev_nr]);
173         adap->dev.parent = &dev->pci_dev->dev;
174
175         return i2c_add_adapter(adap);
176 }
177