[linux-2.6-block.git] / drivers / media / dvb-frontends / isl6421.c

// 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
 *
 * 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 "isl6421.h"

struct isl6421 {
	u8			config;
	u8			override_or;
	u8			override_and;
	struct i2c_adapter	*i2c;
	u8			i2c_addr;
	bool			is_off;
};

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[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;

	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)
{
	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) };

	if (arg)
		isl6421->config |= ISL6421_LLC1;
	else
		isl6421->config &= ~ISL6421_LLC1;

	isl6421->config |= isl6421->override_or;
	isl6421->config &= isl6421->override_and;

	return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
}

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,
			       .buf = &isl6421->config,
			       .len = sizeof(isl6421->config) };

	switch (tone) {
	case SEC_TONE_ON:
		isl6421->config |= ISL6421_ENT1;
		break;
	case SEC_TONE_OFF:
		isl6421->config &= ~ISL6421_ENT1;
		break;
	default:
		return -EINVAL;
	}

	isl6421->config |= isl6421->override_or;
	isl6421->config &= isl6421->override_and;

	return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
}

static void isl6421_release(struct dvb_frontend *fe)
{
	/* power off */
	isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);

	/* free */
	kfree(fe->sec_priv);
	fe->sec_priv = NULL;
}

struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr,
		   u8 override_set, u8 override_clear, bool override_tone)
{
	struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
	if (!isl6421)
		return NULL;

	/* default configuration */
	isl6421->config = ISL6421_ISEL1;
	isl6421->i2c = i2c;
	isl6421->i2c_addr = i2c_addr;
	fe->sec_priv = isl6421;

	/* bits which should be forced to '1' */
	isl6421->override_or = override_set;

	/* bits which should be forced to '0' */
	isl6421->override_and = ~override_clear;

	/* detect if it is present or not */
	if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
		kfree(isl6421);
		fe->sec_priv = NULL;
		return NULL;
	}

	isl6421->is_off = true;

	/* install release callback */
	fe->ops.release_sec = isl6421_release;

	/* override frontend ops */
	fe->ops.set_voltage = isl6421_set_voltage;
	fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
	if (override_tone)
		fe->ops.set_tone = isl6421_set_tone;

	return fe;
}
EXPORT_SYMBOL(isl6421_attach);

MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
MODULE_LICENSE("GPL");
Commit	Line	Data
a0c7056f	1	// SPDX-License-Identifier: GPL-2.0-or-later
21c28582 AQ	2	/*
	3	* isl6421.h - driver for lnb supply and control ic ISL6421
	4	*
	5	* Copyright (C) 2006 Andrew de Quincey
	6	* Copyright (C) 2006 Oliver Endriss
	7	*
991ce92f	8	* the project's page is at https://linuxtv.org
21c28582 AQ	9	*/
	10	#include <linux/delay.h>
	11	#include <linux/errno.h>
	12	#include <linux/init.h>
	13	#include <linux/kernel.h>
	14	#include <linux/module.h>
21c28582 AQ	15	#include <linux/string.h>
	16	#include <linux/slab.h>
	17
fada1935	18	#include <media/dvb_frontend.h>
21c28582 AQ	19	#include "isl6421.h"
	20
	21	struct isl6421 {
	22	u8 config;
	23	u8 override_or;
	24	u8 override_and;
	25	struct i2c_adapter *i2c;
	26	u8 i2c_addr;
21482415	27	bool is_off;
21c28582 AQ	28	};
21c28582 AQ	29
0df289a2 MCC	30	static int isl6421_set_voltage(struct dvb_frontend *fe,
0df289a2 MCC	31	enum fe_sec_voltage voltage)
21c28582	32	{
21482415 JD	33	int ret;
	34	u8 buf;
	35	bool is_off;
13fef933	36	struct isl6421 isl6421 = (struct isl6421 ) fe->sec_priv;
21482415 JD	37	struct i2c_msg msg[2] = {
	38	{
	39	.addr = isl6421->i2c_addr,
	40	.flags = 0,
	41	.buf = &isl6421->config,
	42	.len = 1,
	43	}, {
	44	.addr = isl6421->i2c_addr,
	45	.flags = I2C_M_RD,
	46	.buf = &buf,
	47	.len = 1,
	48	}
	49
	50	};
21c28582 AQ	51
	52	isl6421->config &= ~(ISL6421_VSEL1 \| ISL6421_EN1);
	53
	54	switch(voltage) {
	55	case SEC_VOLTAGE_OFF:
21482415	56	is_off = true;
21c28582 AQ	57	break;
21c28582 AQ	58	case SEC_VOLTAGE_13:
21482415	59	is_off = false;
21c28582 AQ	60	isl6421->config \|= ISL6421_EN1;
	61	break;
	62	case SEC_VOLTAGE_18:
21482415	63	is_off = false;
21c28582 AQ	64	isl6421->config \|= (ISL6421_EN1 \| ISL6421_VSEL1);
	65	break;
	66	default:
	67	return -EINVAL;
c2c1b415	68	}
21c28582	69
21482415 JD	70	/*
	71	* If LNBf were not powered on, disable dynamic current limit, as,
	72	* according with datasheet, highly capacitive load on the output may
	73	* cause a difficult start-up.
	74	*/
	75	if (isl6421->is_off && !is_off)
	76	isl6421->config \|= ISL6421_DCL;
	77
21c28582 AQ	78	isl6421->config \|= isl6421->override_or;
	79	isl6421->config &= isl6421->override_and;
	80
21482415 JD	81	ret = i2c_transfer(isl6421->i2c, msg, 2);
	82	if (ret < 0)
	83	return ret;
	84	if (ret != 2)
	85	return -EIO;
	86
868c9a17	87	/* Store off status now in case future commands fail */
21482415 JD	88	isl6421->is_off = is_off;
	89
	90	/* On overflow, the device will try again after 900 ms (typically) */
	91	if (!is_off && (buf & ISL6421_OLF1))
	92	msleep(1000);
	93
	94	/* Re-enable dynamic current limit */
	95	if ((isl6421->config & ISL6421_DCL) &&
	96	!(isl6421->override_or & ISL6421_DCL)) {
	97	isl6421->config &= ~ISL6421_DCL;
	98
	99	ret = i2c_transfer(isl6421->i2c, msg, 2);
	100	if (ret < 0)
	101	return ret;
	102	if (ret != 2)
	103	return -EIO;
	104	}
	105
	106	/* Check if overload flag is active. If so, disable power */
	107	if (!is_off && (buf & ISL6421_OLF1)) {
	108	isl6421->config &= ~(ISL6421_VSEL1 \| ISL6421_EN1);
	109	ret = i2c_transfer(isl6421->i2c, msg, 1);
	110	if (ret < 0)
	111	return ret;
	112	if (ret != 1)
	113	return -EIO;
	114	isl6421->is_off = true;
	115
	116	dev_warn(&isl6421->i2c->dev,
	117	"Overload current detected. disabling LNBf power\n");
	118	return -EINVAL;
	119	}
	120
	121	return 0;
21c28582 AQ	122	}
	123
	124	static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
	125	{
13fef933	126	struct isl6421 isl6421 = (struct isl6421 ) fe->sec_priv;
21c28582 AQ	127	struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
	128	.buf = &isl6421->config,
	129	.len = sizeof(isl6421->config) };
	130
	131	if (arg)
	132	isl6421->config \|= ISL6421_LLC1;
	133	else
	134	isl6421->config &= ~ISL6421_LLC1;
	135
	136	isl6421->config \|= isl6421->override_or;
	137	isl6421->config &= isl6421->override_and;
	138
	139	return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
	140	}
	141
0df289a2 MCC	142	static int isl6421_set_tone(struct dvb_frontend *fe,
0df289a2 MCC	143	enum fe_sec_tone_mode tone)
48a8a03b MCC	144	{
	145	struct isl6421 isl6421 = (struct isl6421 ) fe->sec_priv;
	146	struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0,
	147	.buf = &isl6421->config,
	148	.len = sizeof(isl6421->config) };
	149
	150	switch (tone) {
	151	case SEC_TONE_ON:
	152	isl6421->config \|= ISL6421_ENT1;
	153	break;
	154	case SEC_TONE_OFF:
	155	isl6421->config &= ~ISL6421_ENT1;
	156	break;
	157	default:
	158	return -EINVAL;
	159	}
	160
	161	isl6421->config \|= isl6421->override_or;
	162	isl6421->config &= isl6421->override_and;
	163
	164	return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO;
	165	}
	166
21c28582 AQ	167	static void isl6421_release(struct dvb_frontend *fe)
21c28582 AQ	168	{
21c28582 AQ	169	/* power off */
	170	isl6421_set_voltage(fe, SEC_VOLTAGE_OFF);
	171
13fef933 AQ	172	/* free */
	173	kfree(fe->sec_priv);
	174	fe->sec_priv = NULL;
21c28582 AQ	175	}
21c28582 AQ	176
13fef933	177	struct dvb_frontend isl6421_attach(struct dvb_frontend fe, struct i2c_adapter *i2c, u8 i2c_addr,
48a8a03b	178	u8 override_set, u8 override_clear, bool override_tone)
21c28582 AQ	179	{
	180	struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL);
	181	if (!isl6421)
13fef933	182	return NULL;
21c28582 AQ	183
	184	/* default configuration */
	185	isl6421->config = ISL6421_ISEL1;
	186	isl6421->i2c = i2c;
	187	isl6421->i2c_addr = i2c_addr;
13fef933	188	fe->sec_priv = isl6421;
21c28582 AQ	189
	190	/* bits which should be forced to '1' */
	191	isl6421->override_or = override_set;
	192
	193	/* bits which should be forced to '0' */
	194	isl6421->override_and = ~override_clear;
	195
	196	/* detect if it is present or not */
	197	if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) {
	198	kfree(isl6421);
09d48954	199	fe->sec_priv = NULL;
13fef933	200	return NULL;
21c28582 AQ	201	}
21c28582 AQ	202
21482415 JD	203	isl6421->is_off = true;
21482415 JD	204
21c28582	205	/* install release callback */
62a7b3e2	206	fe->ops.release_sec = isl6421_release;
21c28582 AQ	207
21c28582 AQ	208	/* override frontend ops */
dea74869 PB	209	fe->ops.set_voltage = isl6421_set_voltage;
dea74869 PB	210	fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage;
48a8a03b MCC	211	if (override_tone)
48a8a03b MCC	212	fe->ops.set_tone = isl6421_set_tone;
21c28582	213
13fef933	214	return fe;
21c28582 AQ	215	}
	216	EXPORT_SYMBOL(isl6421_attach);
	217
	218	MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421");
	219	MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss");
	220	MODULE_LICENSE("GPL");