diff options
Diffstat (limited to 'drivers/media/dvb-frontends/isl6405.c')
| -rw-r--r-- | drivers/media/dvb-frontends/isl6405.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/isl6405.c b/drivers/media/dvb-frontends/isl6405.c new file mode 100644 index 0000000000..7d28a743f9 --- /dev/null +++ b/drivers/media/dvb-frontends/isl6405.c @@ -0,0 +1,148 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * isl6405.c - driver for dual lnb supply and control ic ISL6405 + * + * Copyright (C) 2008 Hartmut Hackmann + * Copyright (C) 2006 Oliver Endriss + * + * 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/string.h> +#include <linux/slab.h> + +#include <media/dvb_frontend.h> +#include "isl6405.h" + +struct isl6405 { + u8 config; + u8 override_or; + u8 override_and; + struct i2c_adapter *i2c; + u8 i2c_addr; +}; + +static int isl6405_set_voltage(struct dvb_frontend *fe, + enum fe_sec_voltage voltage) +{ + struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv; + struct i2c_msg msg = { .addr = isl6405->i2c_addr, .flags = 0, + .buf = &isl6405->config, + .len = sizeof(isl6405->config) }; + + if (isl6405->override_or & 0x80) { + isl6405->config &= ~(ISL6405_VSEL2 | ISL6405_EN2); + switch (voltage) { + case SEC_VOLTAGE_OFF: + break; + case SEC_VOLTAGE_13: + isl6405->config |= ISL6405_EN2; + break; + case SEC_VOLTAGE_18: + isl6405->config |= (ISL6405_EN2 | ISL6405_VSEL2); + break; + default: + return -EINVAL; + } + } else { + isl6405->config &= ~(ISL6405_VSEL1 | ISL6405_EN1); + switch (voltage) { + case SEC_VOLTAGE_OFF: + break; + case SEC_VOLTAGE_13: + isl6405->config |= ISL6405_EN1; + break; + case SEC_VOLTAGE_18: + isl6405->config |= (ISL6405_EN1 | ISL6405_VSEL1); + break; + default: + return -EINVAL; + } + } + isl6405->config |= isl6405->override_or; + isl6405->config &= isl6405->override_and; + + return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO; +} + +static int isl6405_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg) +{ + struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv; + struct i2c_msg msg = { .addr = isl6405->i2c_addr, .flags = 0, + .buf = &isl6405->config, + .len = sizeof(isl6405->config) }; + + if (isl6405->override_or & 0x80) { + if (arg) + isl6405->config |= ISL6405_LLC2; + else + isl6405->config &= ~ISL6405_LLC2; + } else { + if (arg) + isl6405->config |= ISL6405_LLC1; + else + isl6405->config &= ~ISL6405_LLC1; + } + isl6405->config |= isl6405->override_or; + isl6405->config &= isl6405->override_and; + + return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO; +} + +static void isl6405_release(struct dvb_frontend *fe) +{ + /* power off */ + isl6405_set_voltage(fe, SEC_VOLTAGE_OFF); + + /* free */ + kfree(fe->sec_priv); + fe->sec_priv = NULL; +} + +struct dvb_frontend *isl6405_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, + u8 i2c_addr, u8 override_set, u8 override_clear) +{ + struct isl6405 *isl6405 = kmalloc(sizeof(struct isl6405), GFP_KERNEL); + if (!isl6405) + return NULL; + + /* default configuration */ + if (override_set & 0x80) + isl6405->config = ISL6405_ISEL2; + else + isl6405->config = ISL6405_ISEL1; + isl6405->i2c = i2c; + isl6405->i2c_addr = i2c_addr; + fe->sec_priv = isl6405; + + /* bits which should be forced to '1' */ + isl6405->override_or = override_set; + + /* bits which should be forced to '0' */ + isl6405->override_and = ~override_clear; + + /* detect if it is present or not */ + if (isl6405_set_voltage(fe, SEC_VOLTAGE_OFF)) { + kfree(isl6405); + fe->sec_priv = NULL; + return NULL; + } + + /* install release callback */ + fe->ops.release_sec = isl6405_release; + + /* override frontend ops */ + fe->ops.set_voltage = isl6405_set_voltage; + fe->ops.enable_high_lnb_voltage = isl6405_enable_high_lnb_voltage; + + return fe; +} +EXPORT_SYMBOL_GPL(isl6405_attach); + +MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6405"); +MODULE_AUTHOR("Hartmut Hackmann & Oliver Endriss"); +MODULE_LICENSE("GPL"); |