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cb1c0f8e DH |
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> | |
cb1c0f8e | 40 | #include <linux/timer.h> |
cb1c0f8e DH |
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 */ | |
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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])); | |
cb1c0f8e DH |
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 |