diff options
Diffstat (limited to 'drivers/media/dvb/frontends/lnbp21.c')
| -rw-r--r-- | drivers/media/dvb/frontends/lnbp21.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/drivers/media/dvb/frontends/lnbp21.c b/drivers/media/dvb/frontends/lnbp21.c new file mode 100644 index 000000000000..e933edc8dd29 --- /dev/null +++ b/drivers/media/dvb/frontends/lnbp21.c @@ -0,0 +1,145 @@ +/* + * lnbp21.h - driver for lnb supply and control ic lnbp21 + * + * Copyright (C) 2006 Oliver Endriss + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * Or, point your browser to http://www.gnu.org/copyleft/gpl.html + * + * + * the project's page is at http://www.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 "dvb_frontend.h" +#include "lnbp21.h" + +struct lnbp21 { + u8 config; + u8 override_or; + u8 override_and; + struct i2c_adapter *i2c; + void (*release_chain)(struct dvb_frontend* fe); +}; + +static int lnbp21_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage) +{ + struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->misc_priv; + struct i2c_msg msg = { .addr = 0x08, .flags = 0, + .buf = &lnbp21->config, + .len = sizeof(lnbp21->config) }; + + lnbp21->config &= ~(LNBP21_VSEL | LNBP21_EN); + + switch(voltage) { + case SEC_VOLTAGE_OFF: + break; + case SEC_VOLTAGE_13: + lnbp21->config |= LNBP21_EN; + break; + case SEC_VOLTAGE_18: + lnbp21->config |= (LNBP21_EN | LNBP21_VSEL); + break; + default: + return -EINVAL; + }; + + lnbp21->config |= lnbp21->override_or; + lnbp21->config &= lnbp21->override_and; + + return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO; +} + +static int lnbp21_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg) +{ + struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->misc_priv; + struct i2c_msg msg = { .addr = 0x08, .flags = 0, + .buf = &lnbp21->config, + .len = sizeof(lnbp21->config) }; + + if (arg) + lnbp21->config |= LNBP21_LLC; + else + lnbp21->config &= ~LNBP21_LLC; + + lnbp21->config |= lnbp21->override_or; + lnbp21->config &= lnbp21->override_and; + + return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO; +} + +static void lnbp21_release(struct dvb_frontend *fe) +{ + struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->misc_priv; + + /* LNBP power off */ + lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF); + + /* free data & call next release routine */ + fe->ops.release = lnbp21->release_chain; + kfree(fe->misc_priv); + fe->misc_priv = NULL; + if (fe->ops.release) + fe->ops.release(fe); +} + +int lnbp21_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 override_set, u8 override_clear) +{ + struct lnbp21 *lnbp21 = kmalloc(sizeof(struct lnbp21), GFP_KERNEL); + if (!lnbp21) + return -ENOMEM; + + /* default configuration */ + lnbp21->config = LNBP21_ISEL; + lnbp21->i2c = i2c; + fe->misc_priv = lnbp21; + + /* bits which should be forced to '1' */ + lnbp21->override_or = override_set; + + /* bits which should be forced to '0' */ + lnbp21->override_and = ~override_clear; + + /* detect if it is present or not */ + if (lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF)) { + kfree(lnbp21); + fe->misc_priv = NULL; + return -EIO; + } + + /* install release callback */ + lnbp21->release_chain = fe->ops.release; + fe->ops.release = lnbp21_release; + + /* override frontend ops */ + fe->ops.set_voltage = lnbp21_set_voltage; + fe->ops.enable_high_lnb_voltage = lnbp21_enable_high_lnb_voltage; + + return 0; +} +EXPORT_SYMBOL(lnbp21_attach); + +MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp21"); +MODULE_AUTHOR("Oliver Endriss"); +MODULE_LICENSE("GPL"); |