cx88-vp3054-i2c.c revision 5a0e3ad6af8660be21ca98a971cd00f331318c05 
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
34MODULE_DESCRIPTION("driver for cx2388x VP3054 design");
35MODULE_AUTHOR("Chris Pascoe <c.pascoe@itee.uq.edu.au>");
36MODULE_LICENSE("GPL");
37
38/* ----------------------------------------------------------------------- */
39
40static 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
57static 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
74static 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
84static 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
96static 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
107int 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.class |= I2C_CLASS_TV_DIGITAL;
125
126	vp3054_i2c->adap.dev.parent = &dev->pci->dev;
127	strlcpy(vp3054_i2c->adap.name, core->name,
128		sizeof(vp3054_i2c->adap.name));
129	vp3054_i2c->adap.owner = THIS_MODULE;
130	vp3054_i2c->adap.id = I2C_HW_B_CX2388x;
131	vp3054_i2c->algo.data = dev;
132	i2c_set_adapdata(&vp3054_i2c->adap, dev);
133	vp3054_i2c->adap.algo_data = &vp3054_i2c->algo;
134
135	vp3054_bit_setscl(dev,1);
136	vp3054_bit_setsda(dev,1);
137
138	rc = i2c_bit_add_bus(&vp3054_i2c->adap);
139	if (0 != rc) {
140		printk("%s: vp3054_i2c register FAILED\n", core->name);
141
142		kfree(dev->vp3054);
143		dev->vp3054 = NULL;
144	}
145
146	return rc;
147}
148
149void vp3054_i2c_remove(struct cx8802_dev *dev)
150{
151	struct vp3054_i2c_state *vp3054_i2c = dev->vp3054;
152
153	if (vp3054_i2c == NULL ||
154	    dev->core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
155		return;
156
157	i2c_del_adapter(&vp3054_i2c->adap);
158	kfree(vp3054_i2c);
159}
160
161EXPORT_SYMBOL(vp3054_i2c_probe);
162EXPORT_SYMBOL(vp3054_i2c_remove);
163