summaryrefslogtreecommitdiffstats
path: root/drivers/media/dvb/frontends/dibx000_common.c
blob: a4991026254dc0223c71f06f475634338c8e2e2d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
#include <linux/i2c.h>

#include "dibx000_common.h"

static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "turn on debugging (default: 0)");

#define dprintk(args...) do { if (debug) { printk(KERN_DEBUG "DiBX000: "); printk(args); printk("\n"); } } while (0)

static int dibx000_write_word(struct dibx000_i2c_master *mst, u16 reg, u16 val)
{
	u8 b[4] = {
		(reg >> 8) & 0xff, reg & 0xff,
		(val >> 8) & 0xff, val & 0xff,
	};
	struct i2c_msg msg = {
		.addr = mst->i2c_addr,.flags = 0,.buf = b,.len = 4
	};
	return i2c_transfer(mst->i2c_adap, &msg, 1) != 1 ? -EREMOTEIO : 0;
}


static int dibx000_i2c_select_interface(struct dibx000_i2c_master *mst,
					enum dibx000_i2c_interface intf)
{
	if (mst->device_rev > DIB3000MC && mst->selected_interface != intf) {
		dprintk("selecting interface: %d", intf);
		mst->selected_interface = intf;
		return dibx000_write_word(mst, mst->base_reg + 4, intf);
	}
	return 0;
}

static int dibx000_i2c_gate_ctrl(struct dibx000_i2c_master *mst, u8 tx[4],
				 u8 addr, int onoff)
{
	u16 val;


	if (onoff)
		val = addr << 8;	// bit 7 = use master or not, if 0, the gate is open
	else
		val = 1 << 7;

	if (mst->device_rev > DIB7000)
		val <<= 1;

	tx[0] = (((mst->base_reg + 1) >> 8) & 0xff);
	tx[1] = ((mst->base_reg + 1) & 0xff);
	tx[2] = val >> 8;
	tx[3] = val & 0xff;

	return 0;
}

static u32 dibx000_i2c_func(struct i2c_adapter *adapter)
{
	return I2C_FUNC_I2C;
}

static int dibx000_i2c_gated_tuner_xfer(struct i2c_adapter *i2c_adap,
					struct i2c_msg msg[], int num)
{
	struct dibx000_i2c_master *mst = i2c_get_adapdata(i2c_adap);
	struct i2c_msg m[2 + num];
	u8 tx_open[4], tx_close[4];

	memset(m, 0, sizeof(struct i2c_msg) * (2 + num));

	dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_TUNER);

	dibx000_i2c_gate_ctrl(mst, tx_open, msg[0].addr, 1);
	m[0].addr = mst->i2c_addr;
	m[0].buf = tx_open;
	m[0].len = 4;

	memcpy(&m[1], msg, sizeof(struct i2c_msg) * num);

	dibx000_i2c_gate_ctrl(mst, tx_close, 0, 0);
	m[num + 1].addr = mst->i2c_addr;
	m[num + 1].buf = tx_close;
	m[num + 1].len = 4;

	return i2c_transfer(mst->i2c_adap, m, 2 + num) == 2 + num ? num : -EIO;
}

static struct i2c_algorithm dibx000_i2c_gated_tuner_algo = {
	.master_xfer = dibx000_i2c_gated_tuner_xfer,
	.functionality = dibx000_i2c_func,
};

struct i2c_adapter *dibx000_get_i2c_adapter(struct dibx000_i2c_master *mst,
					    enum dibx000_i2c_interface intf,
					    int gating)
{
	struct i2c_adapter *i2c = NULL;

	switch (intf) {
	case DIBX000_I2C_INTERFACE_TUNER:
		if (gating)
			i2c = &mst->gated_tuner_i2c_adap;
		break;
	default:
		printk(KERN_ERR "DiBX000: incorrect I2C interface selected\n");
		break;
	}

	return i2c;
}

EXPORT_SYMBOL(dibx000_get_i2c_adapter);

void dibx000_reset_i2c_master(struct dibx000_i2c_master *mst)
{
	/* initialize the i2c-master by closing the gate */
	u8 tx[4];
	struct i2c_msg m = {.addr = mst->i2c_addr,.buf = tx,.len = 4 };

	dibx000_i2c_gate_ctrl(mst, tx, 0, 0);
	i2c_transfer(mst->i2c_adap, &m, 1);
	mst->selected_interface = 0xff;	// the first time force a select of the I2C
	dibx000_i2c_select_interface(mst, DIBX000_I2C_INTERFACE_TUNER);
}

EXPORT_SYMBOL(dibx000_reset_i2c_master);

static int i2c_adapter_init(struct i2c_adapter *i2c_adap,
			    struct i2c_algorithm *algo, const char *name,
			    struct dibx000_i2c_master *mst)
{
	strncpy(i2c_adap->name, name, sizeof(i2c_adap->name));
	i2c_adap->algo_data = NULL;
	i2c_set_adapdata(i2c_adap, mst);
	if (i2c_add_adapter(i2c_adap) < 0)
		return -ENODEV;
	return 0;
}

int dibx000_init_i2c_master(struct dibx000_i2c_master *mst, u16 device_rev,
			    struct i2c_adapter *i2c_adap, u8 i2c_addr)
{
	u8 tx[4];
	struct i2c_msg m = {.addr = i2c_addr >> 1,.buf = tx,.len = 4 };

	mst->device_rev = device_rev;
	mst->i2c_adap = i2c_adap;
	mst->i2c_addr = i2c_addr >> 1;

	if (device_rev == DIB7000P || device_rev == DIB8000)
		mst->base_reg = 1024;
	else
		mst->base_reg = 768;

	if (i2c_adapter_init
	    (&mst->gated_tuner_i2c_adap, &dibx000_i2c_gated_tuner_algo,
	     "DiBX000 tuner I2C bus", mst) != 0)
		printk(KERN_ERR
		       "DiBX000: could not initialize the tuner i2c_adapter\n");

	/* initialize the i2c-master by closing the gate */
	dibx000_i2c_gate_ctrl(mst, tx, 0, 0);

	return i2c_transfer(i2c_adap, &m, 1) == 1;
}

EXPORT_SYMBOL(dibx000_init_i2c_master);

void dibx000_exit_i2c_master(struct dibx000_i2c_master *mst)
{
	i2c_del_adapter(&mst->gated_tuner_i2c_adap);
}
EXPORT_SYMBOL(dibx000_exit_i2c_master);


u32 systime(void)
{
    struct timespec t;

    t = current_kernel_time();
    return (t.tv_sec * 10000) + (t.tv_nsec / 100000);
}
EXPORT_SYMBOL(systime);

MODULE_AUTHOR("Patrick Boettcher <pboettcher@dibcom.fr>");
MODULE_DESCRIPTION("Common function the DiBcom demodulator family");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud