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 
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 
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 
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 
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 
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 	vp3054_i2c->algo = vp3054_i2c_algo_template;
122 
123 	vp3054_i2c->adap.dev.parent = &dev->pci->dev;
124 	strlcpy(vp3054_i2c->adap.name, core->name,
125 		sizeof(vp3054_i2c->adap.name));
126 	vp3054_i2c->adap.owner = THIS_MODULE;
127 	vp3054_i2c->algo.data = dev;
128 	i2c_set_adapdata(&vp3054_i2c->adap, dev);
129 	vp3054_i2c->adap.algo_data = &vp3054_i2c->algo;
130 
131 	vp3054_bit_setscl(dev,1);
132 	vp3054_bit_setsda(dev,1);
133 
134 	rc = i2c_bit_add_bus(&vp3054_i2c->adap);
135 	if (0 != rc) {
136 		printk("%s: vp3054_i2c register FAILED\n", core->name);
137 
138 		kfree(dev->vp3054);
139 		dev->vp3054 = NULL;
140 	}
141 
142 	return rc;
143 }
144 
145 void vp3054_i2c_remove(struct cx8802_dev *dev)
146 {
147 	struct vp3054_i2c_state *vp3054_i2c = dev->vp3054;
148 
149 	if (vp3054_i2c == NULL ||
150 	    dev->core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO)
151 		return;
152 
153 	i2c_del_adapter(&vp3054_i2c->adap);
154 	kfree(vp3054_i2c);
155 }
156 
157 EXPORT_SYMBOL(vp3054_i2c_probe);
158 EXPORT_SYMBOL(vp3054_i2c_remove);
159