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