diff options
Diffstat (limited to 'drivers/media/dvb-frontends/lnbp22.c')
| -rw-r--r-- | drivers/media/dvb-frontends/lnbp22.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/lnbp22.c b/drivers/media/dvb-frontends/lnbp22.c new file mode 100644 index 0000000000..cb4ea5d3fa --- /dev/null +++ b/drivers/media/dvb-frontends/lnbp22.c @@ -0,0 +1,132 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * lnbp22.h - driver for lnb supply and control ic lnbp22 + * + * Copyright (C) 2006 Dominik Kuhlen + * Based on lnbp21 driver + * + * the project's page is at https://linuxtv.org + */ +#include <linux/delay.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/string.h> +#include <linux/slab.h> + +#include <media/dvb_frontend.h> +#include "lnbp22.h" + +static int debug; +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off)."); + + +#define dprintk(lvl, arg...) if (debug >= (lvl)) printk(arg) + +struct lnbp22 { + u8 config[4]; + struct i2c_adapter *i2c; +}; + +static int lnbp22_set_voltage(struct dvb_frontend *fe, + enum fe_sec_voltage voltage) +{ + struct lnbp22 *lnbp22 = (struct lnbp22 *)fe->sec_priv; + struct i2c_msg msg = { + .addr = 0x08, + .flags = 0, + .buf = (char *)&lnbp22->config, + .len = sizeof(lnbp22->config), + }; + + dprintk(1, "%s: %d (18V=%d 13V=%d)\n", __func__, voltage, + SEC_VOLTAGE_18, SEC_VOLTAGE_13); + + lnbp22->config[3] = 0x60; /* Power down */ + switch (voltage) { + case SEC_VOLTAGE_OFF: + break; + case SEC_VOLTAGE_13: + lnbp22->config[3] |= LNBP22_EN; + break; + case SEC_VOLTAGE_18: + lnbp22->config[3] |= (LNBP22_EN | LNBP22_VSEL); + break; + default: + return -EINVAL; + } + + dprintk(1, "%s: 0x%02x)\n", __func__, lnbp22->config[3]); + return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO; +} + +static int lnbp22_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg) +{ + struct lnbp22 *lnbp22 = (struct lnbp22 *) fe->sec_priv; + struct i2c_msg msg = { + .addr = 0x08, + .flags = 0, + .buf = (char *)&lnbp22->config, + .len = sizeof(lnbp22->config), + }; + + dprintk(1, "%s: %d\n", __func__, (int)arg); + if (arg) + lnbp22->config[3] |= LNBP22_LLC; + else + lnbp22->config[3] &= ~LNBP22_LLC; + + return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO; +} + +static void lnbp22_release(struct dvb_frontend *fe) +{ + dprintk(1, "%s\n", __func__); + /* LNBP power off */ + lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF); + + /* free data */ + kfree(fe->sec_priv); + fe->sec_priv = NULL; +} + +struct dvb_frontend *lnbp22_attach(struct dvb_frontend *fe, + struct i2c_adapter *i2c) +{ + struct lnbp22 *lnbp22 = kmalloc(sizeof(struct lnbp22), GFP_KERNEL); + if (!lnbp22) + return NULL; + + /* default configuration */ + lnbp22->config[0] = 0x00; /* ? */ + lnbp22->config[1] = 0x28; /* ? */ + lnbp22->config[2] = 0x48; /* ? */ + lnbp22->config[3] = 0x60; /* Power down */ + lnbp22->i2c = i2c; + fe->sec_priv = lnbp22; + + /* detect if it is present or not */ + if (lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF)) { + dprintk(0, "%s LNBP22 not found\n", __func__); + kfree(lnbp22); + fe->sec_priv = NULL; + return NULL; + } + + /* install release callback */ + fe->ops.release_sec = lnbp22_release; + + /* override frontend ops */ + fe->ops.set_voltage = lnbp22_set_voltage; + fe->ops.enable_high_lnb_voltage = lnbp22_enable_high_lnb_voltage; + + return fe; +} +EXPORT_SYMBOL_GPL(lnbp22_attach); + +MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp22"); +MODULE_AUTHOR("Dominik Kuhlen"); +MODULE_LICENSE("GPL"); |