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Merge tag 'char-misc-4.13-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregk...
[karo-tx-linux.git] / drivers / media / pci / 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  * To obtain the license, point your browser to
23  * http://www.gnu.org/copyleft/gpl.html
24  */
25
26 /* FIXME - some of these can probably be removed */
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/delay.h>
30 #include <linux/slab.h>
31 #include <linux/poll.h>
32 #include <linux/io.h>
33 #include <asm/div64.h>
34 #include <linux/pci.h>
35 #include <linux/pci_ids.h>
36 #include <linux/timer.h>
37 #include <linux/byteorder/generic.h>
38 #include <linux/firmware.h>
39 #include <linux/vmalloc.h>
40
41 #include "ngene.h"
42
43 /* Firmware command for i2c operations */
44 static int ngene_command_i2c_read(struct ngene *dev, u8 adr,
45                            u8 *out, u8 outlen, u8 *in, u8 inlen, int flag)
46 {
47         struct ngene_command com;
48
49         com.cmd.hdr.Opcode = CMD_I2C_READ;
50         com.cmd.hdr.Length = outlen + 3;
51         com.cmd.I2CRead.Device = adr << 1;
52         memcpy(com.cmd.I2CRead.Data, out, outlen);
53         com.cmd.I2CRead.Data[outlen] = inlen;
54         com.cmd.I2CRead.Data[outlen + 1] = 0;
55         com.in_len = outlen + 3;
56         com.out_len = inlen + 1;
57
58         if (ngene_command(dev, &com) < 0)
59                 return -EIO;
60
61         if ((com.cmd.raw8[0] >> 1) != adr)
62                 return -EIO;
63
64         if (flag)
65                 memcpy(in, com.cmd.raw8, inlen + 1);
66         else
67                 memcpy(in, com.cmd.raw8 + 1, inlen);
68         return 0;
69 }
70
71 static int ngene_command_i2c_write(struct ngene *dev, u8 adr,
72                                    u8 *out, u8 outlen)
73 {
74         struct ngene_command com;
75
76
77         com.cmd.hdr.Opcode = CMD_I2C_WRITE;
78         com.cmd.hdr.Length = outlen + 1;
79         com.cmd.I2CRead.Device = adr << 1;
80         memcpy(com.cmd.I2CRead.Data, out, outlen);
81         com.in_len = outlen + 1;
82         com.out_len = 1;
83
84         if (ngene_command(dev, &com) < 0)
85                 return -EIO;
86
87         if (com.cmd.raw8[0] == 1)
88                 return -EIO;
89
90         return 0;
91 }
92
93 static void ngene_i2c_set_bus(struct ngene *dev, int bus)
94 {
95         if (!(dev->card_info->i2c_access & 2))
96                 return;
97         if (dev->i2c_current_bus == bus)
98                 return;
99
100         switch (bus) {
101         case 0:
102                 ngene_command_gpio_set(dev, 3, 0);
103                 ngene_command_gpio_set(dev, 2, 1);
104                 break;
105
106         case 1:
107                 ngene_command_gpio_set(dev, 2, 0);
108                 ngene_command_gpio_set(dev, 3, 1);
109                 break;
110         }
111         dev->i2c_current_bus = bus;
112 }
113
114 static int ngene_i2c_master_xfer(struct i2c_adapter *adapter,
115                                  struct i2c_msg msg[], int num)
116 {
117         struct ngene_channel *chan =
118                 (struct ngene_channel *)i2c_get_adapdata(adapter);
119         struct ngene *dev = chan->dev;
120
121         mutex_lock(&dev->i2c_switch_mutex);
122         ngene_i2c_set_bus(dev, chan->number);
123
124         if (num == 2 && msg[1].flags & I2C_M_RD && !(msg[0].flags & I2C_M_RD))
125                 if (!ngene_command_i2c_read(dev, msg[0].addr,
126                                             msg[0].buf, msg[0].len,
127                                             msg[1].buf, msg[1].len, 0))
128                         goto done;
129
130         if (num == 1 && !(msg[0].flags & I2C_M_RD))
131                 if (!ngene_command_i2c_write(dev, msg[0].addr,
132                                              msg[0].buf, msg[0].len))
133                         goto done;
134         if (num == 1 && (msg[0].flags & I2C_M_RD))
135                 if (!ngene_command_i2c_read(dev, msg[0].addr, NULL, 0,
136                                             msg[0].buf, msg[0].len, 0))
137                         goto done;
138
139         mutex_unlock(&dev->i2c_switch_mutex);
140         return -EIO;
141
142 done:
143         mutex_unlock(&dev->i2c_switch_mutex);
144         return num;
145 }
146
147
148 static u32 ngene_i2c_functionality(struct i2c_adapter *adap)
149 {
150         return I2C_FUNC_SMBUS_EMUL;
151 }
152
153 static struct i2c_algorithm ngene_i2c_algo = {
154         .master_xfer = ngene_i2c_master_xfer,
155         .functionality = ngene_i2c_functionality,
156 };
157
158 int ngene_i2c_init(struct ngene *dev, int dev_nr)
159 {
160         struct i2c_adapter *adap = &(dev->channel[dev_nr].i2c_adapter);
161
162         i2c_set_adapdata(adap, &(dev->channel[dev_nr]));
163
164         strcpy(adap->name, "nGene");
165
166         adap->algo = &ngene_i2c_algo;
167         adap->algo_data = (void *)&(dev->channel[dev_nr]);
168         adap->dev.parent = &dev->pci_dev->dev;
169
170         return i2c_add_adapter(adap);
171 }
172