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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3	TDA665x tuner driver4	Copyright (C) Manu Abraham (abraham.manu@gmail.com)5 6*/7 8#include <linux/init.h>9#include <linux/kernel.h>10#include <linux/module.h>11#include <linux/slab.h>12 13#include <media/dvb_frontend.h>14#include "tda665x.h"15 16struct tda665x_state {17	struct dvb_frontend		*fe;18	struct i2c_adapter		*i2c;19	const struct tda665x_config	*config;20 21	u32 frequency;22	u32 bandwidth;23};24 25static int tda665x_read(struct tda665x_state *state, u8 *buf)26{27	const struct tda665x_config *config = state->config;28	int err = 0;29	struct i2c_msg msg = { .addr = config->addr, .flags = I2C_M_RD, .buf = buf, .len = 2 };30 31	err = i2c_transfer(state->i2c, &msg, 1);32	if (err != 1)33		goto exit;34 35	return err;36exit:37	printk(KERN_ERR "%s: I/O Error err=<%d>\n", __func__, err);38	return err;39}40 41static int tda665x_write(struct tda665x_state *state, u8 *buf, u8 length)42{43	const struct tda665x_config *config = state->config;44	int err = 0;45	struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = length };46 47	err = i2c_transfer(state->i2c, &msg, 1);48	if (err != 1)49		goto exit;50 51	return err;52exit:53	printk(KERN_ERR "%s: I/O Error err=<%d>\n", __func__, err);54	return err;55}56 57static int tda665x_get_frequency(struct dvb_frontend *fe, u32 *frequency)58{59	struct tda665x_state *state = fe->tuner_priv;60 61	*frequency = state->frequency;62 63	return 0;64}65 66static int tda665x_get_status(struct dvb_frontend *fe, u32 *status)67{68	struct tda665x_state *state = fe->tuner_priv;69	u8 result = 0;70	int err = 0;71 72	*status = 0;73 74	err = tda665x_read(state, &result);75	if (err < 0)76		goto exit;77 78	if ((result >> 6) & 0x01) {79		printk(KERN_DEBUG "%s: Tuner Phase Locked\n", __func__);80		*status = 1;81	}82 83	return err;84exit:85	printk(KERN_ERR "%s: I/O Error\n", __func__);86	return err;87}88 89static int tda665x_set_frequency(struct dvb_frontend *fe,90				 u32 new_frequency)91{92	struct tda665x_state *state = fe->tuner_priv;93	const struct tda665x_config *config = state->config;94	u32 frequency, status = 0;95	u8 buf[4];96	int err = 0;97 98	if ((new_frequency < config->frequency_max)99	    || (new_frequency > config->frequency_min)) {100		printk(KERN_ERR "%s: Frequency beyond limits, frequency=%d\n",101		       __func__, new_frequency);102		return -EINVAL;103	}104 105	frequency = new_frequency;106 107	frequency += config->frequency_offst;108	frequency *= config->ref_multiplier;109	frequency += config->ref_divider >> 1;110	frequency /= config->ref_divider;111 112	buf[0] = (u8) ((frequency & 0x7f00) >> 8);113	buf[1] = (u8) (frequency & 0x00ff) >> 0;114	buf[2] = 0x80 | 0x40 | 0x02;115	buf[3] = 0x00;116 117	/* restore frequency */118	frequency = new_frequency;119 120	if (frequency < 153000000) {121		/* VHF-L */122		buf[3] |= 0x01; /* fc, Low Band, 47 - 153 MHz */123		if (frequency < 68000000)124			buf[3] |= 0x40; /* 83uA */125		if (frequency < 1040000000)126			buf[3] |= 0x60; /* 122uA */127		if (frequency < 1250000000)128			buf[3] |= 0x80; /* 163uA */129		else130			buf[3] |= 0xa0; /* 254uA */131	} else if (frequency < 438000000) {132		/* VHF-H */133		buf[3] |= 0x02; /* fc, Mid Band, 153 - 438 MHz */134		if (frequency < 230000000)135			buf[3] |= 0x40;136		if (frequency < 300000000)137			buf[3] |= 0x60;138		else139			buf[3] |= 0x80;140	} else {141		/* UHF */142		buf[3] |= 0x04; /* fc, High Band, 438 - 862 MHz */143		if (frequency < 470000000)144			buf[3] |= 0x60;145		if (frequency < 526000000)146			buf[3] |= 0x80;147		else148			buf[3] |= 0xa0;149	}150 151	/* Set params */152	err = tda665x_write(state, buf, 5);153	if (err < 0)154		goto exit;155 156	/* sleep for some time */157	printk(KERN_DEBUG "%s: Waiting to Phase LOCK\n", __func__);158	msleep(20);159	/* check status */160	err = tda665x_get_status(fe, &status);161	if (err < 0)162		goto exit;163 164	if (status == 1) {165		printk(KERN_DEBUG "%s: Tuner Phase locked: status=%d\n",166		       __func__, status);167		state->frequency = frequency; /* cache successful state */168	} else {169		printk(KERN_ERR "%s: No Phase lock: status=%d\n",170		       __func__, status);171	}172 173	return 0;174exit:175	printk(KERN_ERR "%s: I/O Error\n", __func__);176	return err;177}178 179static int tda665x_set_params(struct dvb_frontend *fe)180{181	struct dtv_frontend_properties *c = &fe->dtv_property_cache;182 183	tda665x_set_frequency(fe, c->frequency);184 185	return 0;186}187 188static void tda665x_release(struct dvb_frontend *fe)189{190	struct tda665x_state *state = fe->tuner_priv;191 192	fe->tuner_priv = NULL;193	kfree(state);194}195 196static const struct dvb_tuner_ops tda665x_ops = {197	.get_status	= tda665x_get_status,198	.set_params	= tda665x_set_params,199	.get_frequency	= tda665x_get_frequency,200	.release	= tda665x_release201};202 203struct dvb_frontend *tda665x_attach(struct dvb_frontend *fe,204				    const struct tda665x_config *config,205				    struct i2c_adapter *i2c)206{207	struct tda665x_state *state = NULL;208	struct dvb_tuner_info *info;209 210	state = kzalloc(sizeof(struct tda665x_state), GFP_KERNEL);211	if (!state)212		return NULL;213 214	state->config		= config;215	state->i2c		= i2c;216	state->fe		= fe;217	fe->tuner_priv		= state;218	fe->ops.tuner_ops	= tda665x_ops;219	info			 = &fe->ops.tuner_ops.info;220 221	memcpy(info->name, config->name, sizeof(config->name));222	info->frequency_min_hz	= config->frequency_min;223	info->frequency_max_hz	= config->frequency_max;224	info->frequency_step_hz	= config->frequency_offst;225 226	printk(KERN_DEBUG "%s: Attaching TDA665x (%s) tuner\n", __func__, info->name);227 228	return fe;229}230EXPORT_SYMBOL_GPL(tda665x_attach);231 232MODULE_DESCRIPTION("TDA665x driver");233MODULE_AUTHOR("Manu Abraham");234MODULE_LICENSE("GPL");235