summaryrefslogtreecommitdiff
path: root/drivers/media/dvb/frontends/s921_module.c
blob: 3f5a0e1dfdf5dd50918966f6474d4e8b25e01b89 (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
188
189
/*
 * Driver for Sharp s921 driver
 *
 * Copyright (C) 2008 Markus Rechberger <mrechberger@sundtek.de>
 *
 * All rights reserved.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include "dvb_frontend.h"
#include "s921_module.h"
#include "s921_core.h"

static  unsigned int debug = 0;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug,"s921 debugging (default off)");

#define dprintk(fmt, args...) if (debug) do {\
			printk("s921 debug: " fmt, ##args); } while (0)

struct s921_state
{
	struct dvb_frontend frontend;
	fe_modulation_t current_modulation;
	__u32 snr;
	__u32 current_frequency;
	__u8 addr;
	struct s921_isdb_t dev;
	struct i2c_adapter *i2c;
};

static int s921_set_parameters(struct dvb_frontend *fe, struct dvb_frontend_parameters *param) {
	struct s921_state *state = (struct s921_state *)fe->demodulator_priv;
	struct s921_isdb_t_transmission_mode_params params;
	struct s921_isdb_t_tune_params tune_params;

	tune_params.frequency = param->frequency;
	s921_isdb_cmd(&state->dev, ISDB_T_CMD_SET_PARAM, &params);
	s921_isdb_cmd(&state->dev, ISDB_T_CMD_TUNE, &tune_params);
	mdelay(100);
	return 0;
}

static int s921_init(struct dvb_frontend *fe) {
	printk("s921 init\n");
	return 0;
}

static int s921_sleep(struct dvb_frontend *fe) {
	printk("s921 sleep\n");
	return 0;
}

static int s921_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
	struct s921_state *state = (struct s921_state *)fe->demodulator_priv;
	unsigned int ret;
	mdelay(5);
	s921_isdb_cmd(&state->dev, ISDB_T_CMD_GET_STATUS, &ret);
	*status = 0;

	printk("status: %02x\n", ret);
	if (ret == 1) {
		*status |= FE_HAS_CARRIER;
		*status |= FE_HAS_VITERBI;
		*status |= FE_HAS_LOCK;
		*status |= FE_HAS_SYNC;
		*status |= FE_HAS_SIGNAL;
	}

	return 0;
}

static int s921_read_ber(struct dvb_frontend *fe, __u32 *ber)
{
	dprintk("read ber\n");
	return 0;
}

static int s921_read_snr(struct dvb_frontend *fe, __u16 *snr)
{
	dprintk("read snr\n");
	return 0;
}

static int s921_read_ucblocks(struct dvb_frontend *fe, __u32 *ucblocks)
{
	dprintk("read ucblocks\n");
	return 0;
}

static void s921_release(struct dvb_frontend *fe)
{
	struct s921_state *state = (struct s921_state *)fe->demodulator_priv;
	kfree(state);
}

static struct dvb_frontend_ops demod_s921={
	.info = {
		.name			= "SHARP S921",
		.type			= FE_OFDM,
		.frequency_min		= 473143000,
		.frequency_max		= 767143000,
		.frequency_stepsize	=   6000000,
		.frequency_tolerance	= 0,
		.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 |
			FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
			FE_CAN_FEC_AUTO |
			FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
			FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
			FE_CAN_HIERARCHY_AUTO | FE_CAN_RECOVER |
			FE_CAN_MUTE_TS
	},
	.init = s921_init,
	.sleep = s921_sleep,
	.set_frontend = s921_set_parameters,
	.read_snr = s921_read_snr,
	.read_ber = s921_read_ber,
	.read_status = s921_read_status,
	.read_ucblocks = s921_read_ucblocks,
	.release = s921_release,
};

static int s921_write(void *dev, u8 reg, u8 val) {
	struct s921_state *state = dev;
	char buf[2]={reg,val};
	int err;
	struct i2c_msg i2cmsgs = {
		.addr = state->addr,
		.flags = 0,
		.len = 2,
		.buf = buf
	};

	if((err = i2c_transfer(state->i2c, &i2cmsgs, 1))<0) {
		printk("%s i2c_transfer error %d\n", __func__, err);
		if (err < 0)
			return err;
		else
			return -EREMOTEIO;
	}

	return 0;
}

static int s921_read(void *dev, u8 reg) {
	struct s921_state *state = dev;
	u8 b1;
	int ret;
	struct i2c_msg msg[2] = { { .addr = state->addr,
				    .flags = 0,
				    .buf = &reg, .len = 1 },
				  { .addr = state->addr,
				    .flags = I2C_M_RD,
				    .buf = &b1, .len = 1 } };

	ret = i2c_transfer(state->i2c, msg, 2);
	if (ret != 2)
		return ret;
	return b1;
}

struct dvb_frontend* s921_attach(const struct s921_config *config,
					   struct i2c_adapter *i2c)
{

	struct s921_state *state;
	state = kzalloc(sizeof(struct s921_state), GFP_KERNEL);

	state->addr = config->i2c_address;
	state->i2c = i2c;
	state->dev.i2c_write = &s921_write;
	state->dev.i2c_read = &s921_read;
	state->dev.priv_dev = state;

	s921_isdb_cmd(&state->dev, ISDB_T_CMD_INIT, NULL);

	memcpy(&state->frontend.ops, &demod_s921, sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;
	return &state->frontend;
}

EXPORT_SYMBOL_GPL(s921_attach);
MODULE_AUTHOR("Markus Rechberger <mrechberger@empiatech.com>");
MODULE_DESCRIPTION("Sharp S921 ISDB-T 1Seg");
MODULE_LICENSE("GPL");