1a0c7056fSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
29a0bf528SMauro Carvalho Chehab /*
39a0bf528SMauro Carvalho Chehab * isl6421.h - driver for lnb supply and control ic ISL6421
49a0bf528SMauro Carvalho Chehab *
59a0bf528SMauro Carvalho Chehab * Copyright (C) 2006 Andrew de Quincey
69a0bf528SMauro Carvalho Chehab * Copyright (C) 2006 Oliver Endriss
79a0bf528SMauro Carvalho Chehab *
8991ce92fSMauro Carvalho Chehab * the project's page is at https://linuxtv.org
99a0bf528SMauro Carvalho Chehab */
109a0bf528SMauro Carvalho Chehab #include <linux/delay.h>
119a0bf528SMauro Carvalho Chehab #include <linux/errno.h>
129a0bf528SMauro Carvalho Chehab #include <linux/init.h>
139a0bf528SMauro Carvalho Chehab #include <linux/kernel.h>
149a0bf528SMauro Carvalho Chehab #include <linux/module.h>
159a0bf528SMauro Carvalho Chehab #include <linux/string.h>
169a0bf528SMauro Carvalho Chehab #include <linux/slab.h>
179a0bf528SMauro Carvalho Chehab
18fada1935SMauro Carvalho Chehab #include <media/dvb_frontend.h>
199a0bf528SMauro Carvalho Chehab #include "isl6421.h"
209a0bf528SMauro Carvalho Chehab
219a0bf528SMauro Carvalho Chehab struct isl6421 {
229a0bf528SMauro Carvalho Chehab u8 config;
239a0bf528SMauro Carvalho Chehab u8 override_or;
249a0bf528SMauro Carvalho Chehab u8 override_and;
259a0bf528SMauro Carvalho Chehab struct i2c_adapter *i2c;
269a0bf528SMauro Carvalho Chehab u8 i2c_addr;
2721482415SJemma Denson bool is_off;
289a0bf528SMauro Carvalho Chehab };
299a0bf528SMauro Carvalho Chehab
isl6421_set_voltage(struct dvb_frontend * fe,enum fe_sec_voltage voltage)300df289a2SMauro Carvalho Chehab static int isl6421_set_voltage(struct dvb_frontend *fe,
310df289a2SMauro Carvalho Chehab enum fe_sec_voltage voltage)
329a0bf528SMauro Carvalho Chehab {
3321482415SJemma Denson int ret;
3421482415SJemma Denson u8 buf;
3521482415SJemma Denson bool is_off;
369a0bf528SMauro Carvalho Chehab struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
3721482415SJemma Denson struct i2c_msg msg[2] = {
3821482415SJemma Denson {
3921482415SJemma Denson .addr = isl6421->i2c_addr,
4021482415SJemma Denson .flags = 0,
419a0bf528SMauro Carvalho Chehab .buf = &isl6421->config,
4221482415SJemma Denson .len = 1,
4321482415SJemma Denson }, {
4421482415SJemma Denson .addr = isl6421->i2c_addr,
4521482415SJemma Denson .flags = I2C_M_RD,
4621482415SJemma Denson .buf = &buf,
4721482415SJemma Denson .len = 1,
4821482415SJemma Denson }
4921482415SJemma Denson
5021482415SJemma Denson };
519a0bf528SMauro Carvalho Chehab
529a0bf528SMauro Carvalho Chehab isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1);
539a0bf528SMauro Carvalho Chehab
549a0bf528SMauro Carvalho Chehab switch(voltage) {
559a0bf528SMauro Carvalho Chehab case SEC_VOLTAGE_OFF:
5621482415SJemma Denson is_off = true;
579a0bf528SMauro Carvalho Chehab break;
589a0bf528SMauro Carvalho Chehab case SEC_VOLTAGE_13:
5921482415SJemma Denson is_off = false;
609a0bf528SMauro Carvalho Chehab isl6421->config |= ISL6421_EN1;
619a0bf528SMauro Carvalho Chehab break;
629a0bf528SMauro Carvalho Chehab case SEC_VOLTAGE_18:
6321482415SJemma Denson is_off = false;
649a0bf528SMauro Carvalho Chehab isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1);
659a0bf528SMauro Carvalho Chehab break;
669a0bf528SMauro Carvalho Chehab default:
679a0bf528SMauro Carvalho Chehab return -EINVAL;
68c2c1b415SPeter Senna Tschudin }
699a0bf528SMauro Carvalho Chehab
7021482415SJemma Denson /*
7121482415SJemma Denson * If LNBf were not powered on, disable dynamic current limit, as,
7221482415SJemma Denson * according with datasheet, highly capacitive load on the output may
7321482415SJemma Denson * cause a difficult start-up.
7421482415SJemma Denson */
7521482415SJemma Denson if (isl6421->is_off && !is_off)
7621482415SJemma Denson isl6421->config |= ISL6421_DCL;
7721482415SJemma Denson
789a0bf528SMauro Carvalho Chehab isl6421->config |= isl6421->override_or;
799a0bf528SMauro Carvalho Chehab isl6421->config &= isl6421->override_and;
809a0bf528SMauro Carvalho Chehab
8121482415SJemma Denson ret = i2c_transfer(isl6421->i2c, msg, 2);
8221482415SJemma Denson if (ret < 0)
8321482415SJemma Denson return ret;
8421482415SJemma Denson if (ret != 2)
8521482415SJemma Denson return -EIO;
8621482415SJemma Denson
8721482415SJemma Denson /* Store off status now in case future commands fail */
8821482415SJemma Denson isl6421->is_off = is_off;
8921482415SJemma Denson
9021482415SJemma Denson /* On overflow, the device will try again after 900 ms (typically) */
9121482415SJemma Denson if (!is_off && (buf & ISL6421_OLF1))
9221482415SJemma Denson msleep(1000);
9321482415SJemma Denson
9421482415SJemma Denson /* Re-enable dynamic current limit */
9521482415SJemma Denson if ((isl6421->config & ISL6421_DCL) &&
9621482415SJemma Denson !(isl6421->override_or & ISL6421_DCL)) {
9721482415SJemma Denson isl6421->config &= ~ISL6421_DCL;
9821482415SJemma Denson
9921482415SJemma Denson ret = i2c_transfer(isl6421->i2c, msg, 2);
10021482415SJemma Denson if (ret < 0)
10121482415SJemma Denson return ret;
10221482415SJemma Denson if (ret != 2)
10321482415SJemma Denson return -EIO;
10421482415SJemma Denson }
10521482415SJemma Denson
10621482415SJemma Denson /* Check if overload flag is active. If so, disable power */
10721482415SJemma Denson if (!is_off && (buf & ISL6421_OLF1)) {
10821482415SJemma Denson isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1);
10921482415SJemma Denson ret = i2c_transfer(isl6421->i2c, msg, 1);
11021482415SJemma Denson if (ret < 0)
11121482415SJemma Denson return ret;
11221482415SJemma Denson if (ret != 1)
11321482415SJemma Denson return -EIO;
11421482415SJemma Denson isl6421->is_off = true;
11521482415SJemma Denson
11621482415SJemma Denson dev_warn(&isl6421->i2c->dev,
11721482415SJemma Denson "Overload current detected. disabling LNBf power\n");
11821482415SJemma Denson return -EINVAL;
11921482415SJemma Denson }
12021482415SJemma Denson
12121482415SJemma Denson return 0;
1229a0bf528SMauro Carvalho Chehab }
1239a0bf528SMauro Carvalho Chehab
isl6421_enable_high_lnb_voltage(struct dvb_frontend * fe,long arg)1249a0bf528SMauro Carvalho Chehab static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
1259a0bf528SMauro Carvalho Chehab {
1269a0bf528SMauro Carvalho Chehab struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
1279a0bf528SMauro Carvalho Chehab struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
1289a0bf528SMauro Carvalho Chehab .buf = &isl6421->config,
1299a0bf528SMauro Carvalho Chehab .len = sizeof(isl6421->config) };
1309a0bf528SMauro Carvalho Chehab
1319a0bf528SMauro Carvalho Chehab if (arg)
1329a0bf528SMauro Carvalho Chehab isl6421->config |= ISL6421_LLC1;
1339a0bf528SMauro Carvalho Chehab else
1349a0bf528SMauro Carvalho Chehab isl6421->config &= ~ISL6421_LLC1;
1359a0bf528SMauro Carvalho Chehab
1369a0bf528SMauro Carvalho Chehab isl6421->config |= isl6421->override_or;
1379a0bf528SMauro Carvalho Chehab isl6421->config &= isl6421->override_and;
1389a0bf528SMauro Carvalho Chehab
1399a0bf528SMauro Carvalho Chehab return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
1409a0bf528SMauro Carvalho Chehab }
1419a0bf528SMauro Carvalho Chehab
isl6421_set_tone(struct dvb_frontend * fe,enum fe_sec_tone_mode tone)1420df289a2SMauro Carvalho Chehab static int isl6421_set_tone(struct dvb_frontend *fe,
1430df289a2SMauro Carvalho Chehab enum fe_sec_tone_mode tone)
14448a8a03bSMauro Carvalho Chehab {
14548a8a03bSMauro Carvalho Chehab struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv;
14648a8a03bSMauro Carvalho Chehab struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
14748a8a03bSMauro Carvalho Chehab .buf = &isl6421->config,
14848a8a03bSMauro Carvalho Chehab .len = sizeof(isl6421->config) };
14948a8a03bSMauro Carvalho Chehab
15048a8a03bSMauro Carvalho Chehab switch (tone) {
15148a8a03bSMauro Carvalho Chehab case SEC_TONE_ON:
15248a8a03bSMauro Carvalho Chehab isl6421->config |= ISL6421_ENT1;
15348a8a03bSMauro Carvalho Chehab break;
15448a8a03bSMauro Carvalho Chehab case SEC_TONE_OFF:
15548a8a03bSMauro Carvalho Chehab isl6421->config &= ~ISL6421_ENT1;
15648a8a03bSMauro Carvalho Chehab break;
15748a8a03bSMauro Carvalho Chehab default:
15848a8a03bSMauro Carvalho Chehab return -EINVAL;
15948a8a03bSMauro Carvalho Chehab }
16048a8a03bSMauro Carvalho Chehab
16148a8a03bSMauro Carvalho Chehab isl6421->config |= isl6421->override_or;
16248a8a03bSMauro Carvalho Chehab isl6421->config &= isl6421->override_and;
16348a8a03bSMauro Carvalho Chehab
16448a8a03bSMauro Carvalho Chehab return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
16548a8a03bSMauro Carvalho Chehab }
16648a8a03bSMauro Carvalho Chehab
isl6421_release(struct dvb_frontend * fe)1679a0bf528SMauro Carvalho Chehab static void isl6421_release(struct dvb_frontend *fe)
1689a0bf528SMauro Carvalho Chehab {
1699a0bf528SMauro Carvalho Chehab /* power off */
1709a0bf528SMauro Carvalho Chehab isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);
1719a0bf528SMauro Carvalho Chehab
1729a0bf528SMauro Carvalho Chehab /* free */
1739a0bf528SMauro Carvalho Chehab kfree(fe->sec_priv);
1749a0bf528SMauro Carvalho Chehab fe->sec_priv = NULL;
1759a0bf528SMauro Carvalho Chehab }
1769a0bf528SMauro Carvalho Chehab
isl6421_attach(struct dvb_frontend * fe,struct i2c_adapter * i2c,u8 i2c_addr,u8 override_set,u8 override_clear,bool override_tone)1779a0bf528SMauro Carvalho Chehab struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr,
17848a8a03bSMauro Carvalho Chehab u8 override_set, u8 override_clear, bool override_tone)
1799a0bf528SMauro Carvalho Chehab {
1809a0bf528SMauro Carvalho Chehab struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
1819a0bf528SMauro Carvalho Chehab if (!isl6421)
1829a0bf528SMauro Carvalho Chehab return NULL;
1839a0bf528SMauro Carvalho Chehab
1849a0bf528SMauro Carvalho Chehab /* default configuration */
1859a0bf528SMauro Carvalho Chehab isl6421->config = ISL6421_ISEL1;
1869a0bf528SMauro Carvalho Chehab isl6421->i2c = i2c;
1879a0bf528SMauro Carvalho Chehab isl6421->i2c_addr = i2c_addr;
1889a0bf528SMauro Carvalho Chehab fe->sec_priv = isl6421;
1899a0bf528SMauro Carvalho Chehab
1909a0bf528SMauro Carvalho Chehab /* bits which should be forced to '1' */
1919a0bf528SMauro Carvalho Chehab isl6421->override_or = override_set;
1929a0bf528SMauro Carvalho Chehab
1939a0bf528SMauro Carvalho Chehab /* bits which should be forced to '0' */
1949a0bf528SMauro Carvalho Chehab isl6421->override_and = ~override_clear;
1959a0bf528SMauro Carvalho Chehab
1969a0bf528SMauro Carvalho Chehab /* detect if it is present or not */
1979a0bf528SMauro Carvalho Chehab if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
1989a0bf528SMauro Carvalho Chehab kfree(isl6421);
1999a0bf528SMauro Carvalho Chehab fe->sec_priv = NULL;
2009a0bf528SMauro Carvalho Chehab return NULL;
2019a0bf528SMauro Carvalho Chehab }
2029a0bf528SMauro Carvalho Chehab
20321482415SJemma Denson isl6421->is_off = true;
20421482415SJemma Denson
2059a0bf528SMauro Carvalho Chehab /* install release callback */
2069a0bf528SMauro Carvalho Chehab fe->ops.release_sec = isl6421_release;
2079a0bf528SMauro Carvalho Chehab
2089a0bf528SMauro Carvalho Chehab /* override frontend ops */
2099a0bf528SMauro Carvalho Chehab fe->ops.set_voltage = isl6421_set_voltage;
2109a0bf528SMauro Carvalho Chehab fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
21148a8a03bSMauro Carvalho Chehab if (override_tone)
21248a8a03bSMauro Carvalho Chehab fe->ops.set_tone = isl6421_set_tone;
2139a0bf528SMauro Carvalho Chehab
2149a0bf528SMauro Carvalho Chehab return fe;
2159a0bf528SMauro Carvalho Chehab }
216*86495af1SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(isl6421_attach);
2179a0bf528SMauro Carvalho Chehab
2189a0bf528SMauro Carvalho Chehab MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
2199a0bf528SMauro Carvalho Chehab MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
2209a0bf528SMauro Carvalho Chehab MODULE_LICENSE("GPL");
221