1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Allegro A8293 SEC driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2011 Antti Palosaari <crope@iki.fi>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include "a8293.h"
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun struct a8293_dev {
11*4882a593Smuzhiyun struct i2c_client *client;
12*4882a593Smuzhiyun u8 reg[2];
13*4882a593Smuzhiyun };
14*4882a593Smuzhiyun
a8293_set_voltage(struct dvb_frontend * fe,enum fe_sec_voltage fe_sec_voltage)15*4882a593Smuzhiyun static int a8293_set_voltage(struct dvb_frontend *fe,
16*4882a593Smuzhiyun enum fe_sec_voltage fe_sec_voltage)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun struct a8293_dev *dev = fe->sec_priv;
19*4882a593Smuzhiyun struct i2c_client *client = dev->client;
20*4882a593Smuzhiyun int ret;
21*4882a593Smuzhiyun u8 reg0, reg1;
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun dev_dbg(&client->dev, "fe_sec_voltage=%d\n", fe_sec_voltage);
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun switch (fe_sec_voltage) {
26*4882a593Smuzhiyun case SEC_VOLTAGE_OFF:
27*4882a593Smuzhiyun /* ENB=0 */
28*4882a593Smuzhiyun reg0 = 0x10;
29*4882a593Smuzhiyun break;
30*4882a593Smuzhiyun case SEC_VOLTAGE_13:
31*4882a593Smuzhiyun /* VSEL0=1, VSEL1=0, VSEL2=0, VSEL3=0, ENB=1*/
32*4882a593Smuzhiyun reg0 = 0x31;
33*4882a593Smuzhiyun break;
34*4882a593Smuzhiyun case SEC_VOLTAGE_18:
35*4882a593Smuzhiyun /* VSEL0=0, VSEL1=0, VSEL2=0, VSEL3=1, ENB=1*/
36*4882a593Smuzhiyun reg0 = 0x38;
37*4882a593Smuzhiyun break;
38*4882a593Smuzhiyun default:
39*4882a593Smuzhiyun ret = -EINVAL;
40*4882a593Smuzhiyun goto err;
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun if (reg0 != dev->reg[0]) {
43*4882a593Smuzhiyun ret = i2c_master_send(client, ®0, 1);
44*4882a593Smuzhiyun if (ret < 0)
45*4882a593Smuzhiyun goto err;
46*4882a593Smuzhiyun dev->reg[0] = reg0;
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun /* TMODE=0, TGATE=1 */
50*4882a593Smuzhiyun reg1 = 0x82;
51*4882a593Smuzhiyun if (reg1 != dev->reg[1]) {
52*4882a593Smuzhiyun ret = i2c_master_send(client, ®1, 1);
53*4882a593Smuzhiyun if (ret < 0)
54*4882a593Smuzhiyun goto err;
55*4882a593Smuzhiyun dev->reg[1] = reg1;
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun usleep_range(1500, 50000);
59*4882a593Smuzhiyun return 0;
60*4882a593Smuzhiyun err:
61*4882a593Smuzhiyun dev_dbg(&client->dev, "failed=%d\n", ret);
62*4882a593Smuzhiyun return ret;
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
a8293_probe(struct i2c_client * client,const struct i2c_device_id * id)65*4882a593Smuzhiyun static int a8293_probe(struct i2c_client *client,
66*4882a593Smuzhiyun const struct i2c_device_id *id)
67*4882a593Smuzhiyun {
68*4882a593Smuzhiyun struct a8293_dev *dev;
69*4882a593Smuzhiyun struct a8293_platform_data *pdata = client->dev.platform_data;
70*4882a593Smuzhiyun struct dvb_frontend *fe = pdata->dvb_frontend;
71*4882a593Smuzhiyun int ret;
72*4882a593Smuzhiyun u8 buf[2];
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun dev = kzalloc(sizeof(*dev), GFP_KERNEL);
75*4882a593Smuzhiyun if (!dev) {
76*4882a593Smuzhiyun ret = -ENOMEM;
77*4882a593Smuzhiyun goto err;
78*4882a593Smuzhiyun }
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun dev->client = client;
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun /* check if the SEC is there */
83*4882a593Smuzhiyun ret = i2c_master_recv(client, buf, 2);
84*4882a593Smuzhiyun if (ret < 0)
85*4882a593Smuzhiyun goto err_kfree;
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun /* override frontend ops */
88*4882a593Smuzhiyun fe->ops.set_voltage = a8293_set_voltage;
89*4882a593Smuzhiyun fe->sec_priv = dev;
90*4882a593Smuzhiyun i2c_set_clientdata(client, dev);
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun dev_info(&client->dev, "Allegro A8293 SEC successfully attached\n");
93*4882a593Smuzhiyun return 0;
94*4882a593Smuzhiyun err_kfree:
95*4882a593Smuzhiyun kfree(dev);
96*4882a593Smuzhiyun err:
97*4882a593Smuzhiyun dev_dbg(&client->dev, "failed=%d\n", ret);
98*4882a593Smuzhiyun return ret;
99*4882a593Smuzhiyun }
100*4882a593Smuzhiyun
a8293_remove(struct i2c_client * client)101*4882a593Smuzhiyun static int a8293_remove(struct i2c_client *client)
102*4882a593Smuzhiyun {
103*4882a593Smuzhiyun struct a8293_dev *dev = i2c_get_clientdata(client);
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun dev_dbg(&client->dev, "\n");
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun kfree(dev);
108*4882a593Smuzhiyun return 0;
109*4882a593Smuzhiyun }
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun static const struct i2c_device_id a8293_id_table[] = {
112*4882a593Smuzhiyun {"a8293", 0},
113*4882a593Smuzhiyun {}
114*4882a593Smuzhiyun };
115*4882a593Smuzhiyun MODULE_DEVICE_TABLE(i2c, a8293_id_table);
116*4882a593Smuzhiyun
117*4882a593Smuzhiyun static struct i2c_driver a8293_driver = {
118*4882a593Smuzhiyun .driver = {
119*4882a593Smuzhiyun .name = "a8293",
120*4882a593Smuzhiyun .suppress_bind_attrs = true,
121*4882a593Smuzhiyun },
122*4882a593Smuzhiyun .probe = a8293_probe,
123*4882a593Smuzhiyun .remove = a8293_remove,
124*4882a593Smuzhiyun .id_table = a8293_id_table,
125*4882a593Smuzhiyun };
126*4882a593Smuzhiyun
127*4882a593Smuzhiyun module_i2c_driver(a8293_driver);
128*4882a593Smuzhiyun
129*4882a593Smuzhiyun MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
130*4882a593Smuzhiyun MODULE_DESCRIPTION("Allegro A8293 SEC driver");
131*4882a593Smuzhiyun MODULE_LICENSE("GPL");
132