diff options
Diffstat (limited to 'drivers/media/dvb-frontends/a8293.c')
| -rw-r--r-- | drivers/media/dvb-frontends/a8293.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/a8293.c b/drivers/media/dvb-frontends/a8293.c new file mode 100644 index 000000000..57f52c004 --- /dev/null +++ b/drivers/media/dvb-frontends/a8293.c @@ -0,0 +1,131 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Allegro A8293 SEC driver + * + * Copyright (C) 2011 Antti Palosaari <crope@iki.fi> + */ + +#include "a8293.h" + +struct a8293_dev { + struct i2c_client *client; + u8 reg[2]; +}; + +static int a8293_set_voltage(struct dvb_frontend *fe, + enum fe_sec_voltage fe_sec_voltage) +{ + struct a8293_dev *dev = fe->sec_priv; + struct i2c_client *client = dev->client; + int ret; + u8 reg0, reg1; + + dev_dbg(&client->dev, "fe_sec_voltage=%d\n", fe_sec_voltage); + + switch (fe_sec_voltage) { + case SEC_VOLTAGE_OFF: + /* ENB=0 */ + reg0 = 0x10; + break; + case SEC_VOLTAGE_13: + /* VSEL0=1, VSEL1=0, VSEL2=0, VSEL3=0, ENB=1*/ + reg0 = 0x31; + break; + case SEC_VOLTAGE_18: + /* VSEL0=0, VSEL1=0, VSEL2=0, VSEL3=1, ENB=1*/ + reg0 = 0x38; + break; + default: + ret = -EINVAL; + goto err; + } + if (reg0 != dev->reg[0]) { + ret = i2c_master_send(client, ®0, 1); + if (ret < 0) + goto err; + dev->reg[0] = reg0; + } + + /* TMODE=0, TGATE=1 */ + reg1 = 0x82; + if (reg1 != dev->reg[1]) { + ret = i2c_master_send(client, ®1, 1); + if (ret < 0) + goto err; + dev->reg[1] = reg1; + } + + usleep_range(1500, 50000); + return 0; +err: + dev_dbg(&client->dev, "failed=%d\n", ret); + return ret; +} + +static int a8293_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct a8293_dev *dev; + struct a8293_platform_data *pdata = client->dev.platform_data; + struct dvb_frontend *fe = pdata->dvb_frontend; + int ret; + u8 buf[2]; + + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) { + ret = -ENOMEM; + goto err; + } + + dev->client = client; + + /* check if the SEC is there */ + ret = i2c_master_recv(client, buf, 2); + if (ret < 0) + goto err_kfree; + + /* override frontend ops */ + fe->ops.set_voltage = a8293_set_voltage; + fe->sec_priv = dev; + i2c_set_clientdata(client, dev); + + dev_info(&client->dev, "Allegro A8293 SEC successfully attached\n"); + return 0; +err_kfree: + kfree(dev); +err: + dev_dbg(&client->dev, "failed=%d\n", ret); + return ret; +} + +static int a8293_remove(struct i2c_client *client) +{ + struct a8293_dev *dev = i2c_get_clientdata(client); + + dev_dbg(&client->dev, "\n"); + + kfree(dev); + return 0; +} + +static const struct i2c_device_id a8293_id_table[] = { + {"a8293", 0}, + {} +}; +MODULE_DEVICE_TABLE(i2c, a8293_id_table); + +static struct i2c_driver a8293_driver = { + .driver = { + .name = "a8293", + .suppress_bind_attrs = true, + }, + .probe = a8293_probe, + .remove = a8293_remove, + .id_table = a8293_id_table, +}; + +module_i2c_driver(a8293_driver); + +MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>"); +MODULE_DESCRIPTION("Allegro A8293 SEC driver"); +MODULE_LICENSE("GPL"); |