diff options
Diffstat (limited to 'drivers/media/dvb-frontends/isl6421.c')
| -rw-r--r-- | drivers/media/dvb-frontends/isl6421.c | 107 |
1 files changed, 80 insertions, 27 deletions
diff --git a/drivers/media/dvb-frontends/isl6421.c b/drivers/media/dvb-frontends/isl6421.c index c77002fcc8e2..2e9f6f12f849 100644 --- a/drivers/media/dvb-frontends/isl6421.c +++ b/drivers/media/dvb-frontends/isl6421.c @@ -1,28 +1,11 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * isl6421.h - driver for lnb supply and control ic ISL6421 * * Copyright (C) 2006 Andrew de Quincey * 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 + * the project's page is at https://linuxtv.org */ #include <linux/delay.h> #include <linux/errno.h> @@ -32,7 +15,7 @@ #include <linux/string.h> #include <linux/slab.h> -#include "dvb_frontend.h" +#include <media/dvb_frontend.h> #include "isl6421.h" struct isl6421 { @@ -41,34 +24,101 @@ struct isl6421 { u8 override_and; struct i2c_adapter *i2c; u8 i2c_addr; + bool is_off; }; -static int isl6421_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t voltage) +static int isl6421_set_voltage(struct dvb_frontend *fe, + enum fe_sec_voltage voltage) { + int ret; + u8 buf; + bool is_off; struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv; - struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0, - .buf = &isl6421->config, - .len = sizeof(isl6421->config) }; + struct i2c_msg msg[2] = { + { + .addr = isl6421->i2c_addr, + .flags = 0, + .buf = &isl6421->config, + .len = 1, + }, { + .addr = isl6421->i2c_addr, + .flags = I2C_M_RD, + .buf = &buf, + .len = 1, + } + + }; isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1); switch(voltage) { case SEC_VOLTAGE_OFF: + is_off = true; break; case SEC_VOLTAGE_13: + is_off = false; isl6421->config |= ISL6421_EN1; break; case SEC_VOLTAGE_18: + is_off = false; isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1); break; default: return -EINVAL; } + /* + * If LNBf were not powered on, disable dynamic current limit, as, + * according with datasheet, highly capacitive load on the output may + * cause a difficult start-up. + */ + if (isl6421->is_off && !is_off) + isl6421->config |= ISL6421_DCL; + isl6421->config |= isl6421->override_or; isl6421->config &= isl6421->override_and; - return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO; + ret = i2c_transfer(isl6421->i2c, msg, 2); + if (ret < 0) + return ret; + if (ret != 2) + return -EIO; + + /* Store off status now in case future commands fail */ + isl6421->is_off = is_off; + + /* On overflow, the device will try again after 900 ms (typically) */ + if (!is_off && (buf & ISL6421_OLF1)) + msleep(1000); + + /* Re-enable dynamic current limit */ + if ((isl6421->config & ISL6421_DCL) && + !(isl6421->override_or & ISL6421_DCL)) { + isl6421->config &= ~ISL6421_DCL; + + ret = i2c_transfer(isl6421->i2c, msg, 2); + if (ret < 0) + return ret; + if (ret != 2) + return -EIO; + } + + /* Check if overload flag is active. If so, disable power */ + if (!is_off && (buf & ISL6421_OLF1)) { + isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1); + ret = i2c_transfer(isl6421->i2c, msg, 1); + if (ret < 0) + return ret; + if (ret != 1) + return -EIO; + isl6421->is_off = true; + + dev_warn(&isl6421->i2c->dev, + "Overload current detected. disabling LNBf power\n"); + return -EINVAL; + } + + return 0; } static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg) @@ -89,7 +139,8 @@ static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg) return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO; } -static int isl6421_set_tone(struct dvb_frontend* fe, fe_sec_tone_mode_t tone) +static int isl6421_set_tone(struct dvb_frontend *fe, + enum fe_sec_tone_mode tone) { struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv; struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0, @@ -149,6 +200,8 @@ struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter return NULL; } + isl6421->is_off = true; + /* install release callback */ fe->ops.release_sec = isl6421_release; @@ -160,7 +213,7 @@ struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter return fe; } -EXPORT_SYMBOL(isl6421_attach); +EXPORT_SYMBOL_GPL(isl6421_attach); MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421"); MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss"); |