1 /*
2
3 cx88-vp3054-i2c.c -- support for the secondary I2C bus of the
4 DNTV Live! DVB-T Pro (VP-3054), wired as:
5 GPIO[0] -> SCL, GPIO[1] -> SDA
6
7 (c) 2005 Chris Pascoe <c.pascoe@itee.uq.edu.au>
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22
23 */
24
25 #include <linux/module.h>
26 #include <linux/slab.h>
27 #include <linux/init.h>
28
29 #include <asm/io.h>
30
31 #include "cx88.h"
32 #include "cx88-vp3054-i2c.h"
33
34 MODULE_DESCRIPTION("driver for cx2388x VP3054 design");
35 MODULE_AUTHOR("Chris Pascoe <c.pascoe@itee.uq.edu.au>");
36 MODULE_LICENSE("GPL");
37
38 /* ----------------------------------------------------------------------- */
39
vp3054_bit_setscl(void * data,int state)40 static void vp3054_bit_setscl(void *data, int state)
41 {
42 struct cx8802_dev *dev = data;
43 struct cx88_core *core = dev->core;
44 struct vp3054_i2c_state *vp3054_i2c = dev->vp3054;
45
46 if (state) {
47 vp3054_i2c->state |= 0x0001; /* SCL high */
48 vp3054_i2c->state &= ~0x0100; /* external pullup */
49 } else {
50 vp3054_i2c->state &= ~0x0001; /* SCL low */
51 vp3054_i2c->state |= 0x0100; /* drive pin */
52 }
53 cx_write(MO_GP0_IO, 0x010000 | vp3054_i2c->state);
54 cx_read(MO_GP0_IO);
55 }
56
vp3054_bit_setsda(void * data,int state)57 static void vp3054_bit_setsda(void *data, int state)
58 {
59 struct cx8802_dev *dev = data;
60 struct cx88_core *core = dev->core;
61 struct vp3054_i2c_state *vp3054_i2c = dev->vp3054;
62
63 if (state) {
64 vp3054_i2c->state |= 0x0002; /* SDA high */
65 vp3054_i2c->state &= ~0x0200; /* tristate pin */
66 } else {
67 vp3054_i2c->state &= ~0x0002; /* SDA low */
68 vp3054_i2c->state |= 0x0200; /* drive pin */
69 }
70 cx_write(MO_GP0_IO, 0x020000 | vp3054_i2c->state);
71 cx_read(MO_GP0_IO);
72 }
73
vp3054_bit_getscl(void * data)74 static int vp3054_bit_getscl(void *data)
75 {
76 struct cx8802_dev *dev = data;
77 struct cx88_core *core = dev->core;
78 u32 state;
79
80 state = cx_read(MO_GP0_IO);
81 return (state & 0x01) ? 1 : 0;
82 }
83
vp3054_bit_getsda(void * data)84 static int vp3054_bit_getsda(void *data)
85 {
86 struct cx8802_dev *dev = data;
87 struct cx88_core *core = dev->core;
88 u32 state;
89
90 state = cx_read(MO_GP0_IO);
91 return (state & 0x02) ? 1 : 0;
92 }
93
94 /* ----------------------------------------------------------------------- */
95
96 static const struct i2c_algo_bit_data vp3054_i2c_algo_template = {
97 .setsda = vp3054_bit_setsda,
98 .setscl = vp3054_bit_setscl,
99 .getsda = vp3054_bit_getsda,
100 .getscl = vp3054_bit_getscl,
101 .udelay = 16,
102 .timeout = 200,
103 };
104
105 /* ----------------------------------------------------------------------- */
106
vp3054_i2c_probe(struct cx8802_dev * dev)107 int vp3054_i2c_probe(struct cx8802_dev *dev)
108 {
109 struct cx88_core *core = dev->core;
110 struct vp3054_i2c_state *vp3054_i2c;
111 int rc;
112
113 if (core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
114 return 0;
115
116 vp3054_i2c = kzalloc(sizeof(*vp3054_i2c), GFP_KERNEL);
117 if (vp3054_i2c == NULL)
118 return -ENOMEM;
119 dev->vp3054 = vp3054_i2c;
120
121 memcpy(&vp3054_i2c->algo, &vp3054_i2c_algo_template,
122 sizeof(vp3054_i2c->algo));
123
124 vp3054_i2c->adap.dev.parent = &dev->pci->dev;
125 strlcpy(vp3054_i2c->adap.name, core->name,
126 sizeof(vp3054_i2c->adap.name));
127 vp3054_i2c->adap.owner = THIS_MODULE;
128 vp3054_i2c->algo.data = dev;
129 i2c_set_adapdata(&vp3054_i2c->adap, dev);
130 vp3054_i2c->adap.algo_data = &vp3054_i2c->algo;
131
132 vp3054_bit_setscl(dev,1);
133 vp3054_bit_setsda(dev,1);
134
135 rc = i2c_bit_add_bus(&vp3054_i2c->adap);
136 if (0 != rc) {
137 printk("%s: vp3054_i2c register FAILED\n", core->name);
138
139 kfree(dev->vp3054);
140 dev->vp3054 = NULL;
141 }
142
143 return rc;
144 }
145
vp3054_i2c_remove(struct cx8802_dev * dev)146 void vp3054_i2c_remove(struct cx8802_dev *dev)
147 {
148 struct vp3054_i2c_state *vp3054_i2c = dev->vp3054;
149
150 if (vp3054_i2c == NULL ||
151 dev->core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
152 return;
153
154 i2c_del_adapter(&vp3054_i2c->adap);
155 kfree(vp3054_i2c);
156 }
157
158 EXPORT_SYMBOL(vp3054_i2c_probe);
159 EXPORT_SYMBOL(vp3054_i2c_remove);
160