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 */
ngene_command_i2c_read(struct ngene * dev,u8 adr,u8 * out,u8 outlen,u8 * in,u8 inlen,int flag)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
ngene_command_i2c_write(struct ngene * dev,u8 adr,u8 * out,u8 outlen)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
ngene_i2c_set_bus(struct ngene * dev,int bus)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
ngene_i2c_master_xfer(struct i2c_adapter * adapter,struct i2c_msg msg[],int num)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
ngene_i2c_functionality(struct i2c_adapter * adap)148 static u32 ngene_i2c_functionality(struct i2c_adapter *adap)
149 {
150 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
151 }
152
153 static const struct i2c_algorithm ngene_i2c_algo = {
154 .master_xfer = ngene_i2c_master_xfer,
155 .functionality = ngene_i2c_functionality,
156 };
157
ngene_i2c_init(struct ngene * dev,int dev_nr)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
173
