brintos

brintos / linux-shallow public Read only

0
0
Text · 9.4 KiB · 1575ab9 Raw
418 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 *  Driver for Maxim MAX2165 silicon tuner4 *5 *  Copyright (c) 2009 David T. L. Wong <davidtlwong@gmail.com>6 */7 8#include <linux/module.h>9#include <linux/moduleparam.h>10#include <linux/videodev2.h>11#include <linux/delay.h>12#include <linux/dvb/frontend.h>13#include <linux/i2c.h>14#include <linux/slab.h>15 16#include <media/dvb_frontend.h>17 18#include "max2165.h"19#include "max2165_priv.h"20#include "tuner-i2c.h"21 22#define dprintk(args...) \23	do { \24		if (debug) \25			printk(KERN_DEBUG "max2165: " args); \26	} while (0)27 28static int debug;29module_param(debug, int, 0644);30MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");31 32static int max2165_write_reg(struct max2165_priv *priv, u8 reg, u8 data)33{34	int ret;35	u8 buf[] = { reg, data };36	struct i2c_msg msg = { .flags = 0, .buf = buf, .len = 2 };37 38	msg.addr = priv->config->i2c_address;39 40	if (debug >= 2)41		dprintk("%s: reg=0x%02X, data=0x%02X\n", __func__, reg, data);42 43	ret = i2c_transfer(priv->i2c, &msg, 1);44 45	if (ret != 1)46		dprintk("%s: error reg=0x%x, data=0x%x, ret=%i\n",47			__func__, reg, data, ret);48 49	return (ret != 1) ? -EIO : 0;50}51 52static int max2165_read_reg(struct max2165_priv *priv, u8 reg, u8 *p_data)53{54	int ret;55	u8 dev_addr = priv->config->i2c_address;56 57	u8 b0[] = { reg };58	u8 b1[] = { 0 };59	struct i2c_msg msg[] = {60		{ .addr = dev_addr, .flags = 0, .buf = b0, .len = 1 },61		{ .addr = dev_addr, .flags = I2C_M_RD, .buf = b1, .len = 1 },62	};63 64	ret = i2c_transfer(priv->i2c, msg, 2);65	if (ret != 2) {66		dprintk("%s: error reg=0x%x, ret=%i\n", __func__, reg, ret);67		return -EIO;68	}69 70	*p_data = b1[0];71	if (debug >= 2)72		dprintk("%s: reg=0x%02X, data=0x%02X\n",73			__func__, reg, b1[0]);74	return 0;75}76 77static int max2165_mask_write_reg(struct max2165_priv *priv, u8 reg,78	u8 mask, u8 data)79{80	int ret;81	u8 v;82 83	data &= mask;84	ret = max2165_read_reg(priv, reg, &v);85	if (ret != 0)86		return ret;87	v &= ~mask;88	v |= data;89	ret = max2165_write_reg(priv, reg, v);90 91	return ret;92}93 94static int max2165_read_rom_table(struct max2165_priv *priv)95{96	u8 dat[3];97	int i;98 99	for (i = 0; i < 3; i++) {100		max2165_write_reg(priv, REG_ROM_TABLE_ADDR, i + 1);101		max2165_read_reg(priv, REG_ROM_TABLE_DATA, &dat[i]);102	}103 104	priv->tf_ntch_low_cfg = dat[0] >> 4;105	priv->tf_ntch_hi_cfg = dat[0] & 0x0F;106	priv->tf_balun_low_ref = dat[1] & 0x0F;107	priv->tf_balun_hi_ref = dat[1] >> 4;108	priv->bb_filter_7mhz_cfg = dat[2] & 0x0F;109	priv->bb_filter_8mhz_cfg = dat[2] >> 4;110 111	dprintk("tf_ntch_low_cfg = 0x%X\n", priv->tf_ntch_low_cfg);112	dprintk("tf_ntch_hi_cfg = 0x%X\n", priv->tf_ntch_hi_cfg);113	dprintk("tf_balun_low_ref = 0x%X\n", priv->tf_balun_low_ref);114	dprintk("tf_balun_hi_ref = 0x%X\n", priv->tf_balun_hi_ref);115	dprintk("bb_filter_7mhz_cfg = 0x%X\n", priv->bb_filter_7mhz_cfg);116	dprintk("bb_filter_8mhz_cfg = 0x%X\n", priv->bb_filter_8mhz_cfg);117 118	return 0;119}120 121static int max2165_set_osc(struct max2165_priv *priv, u8 osc /*MHz*/)122{123	u8 v;124 125	v = (osc / 2);126	if (v == 2)127		v = 0x7;128	else129		v -= 8;130 131	max2165_mask_write_reg(priv, REG_PLL_CFG, 0x07, v);132 133	return 0;134}135 136static int max2165_set_bandwidth(struct max2165_priv *priv, u32 bw)137{138	u8 val;139 140	if (bw == 8000000)141		val = priv->bb_filter_8mhz_cfg;142	else143		val = priv->bb_filter_7mhz_cfg;144 145	max2165_mask_write_reg(priv, REG_BASEBAND_CTRL, 0xF0, val << 4);146 147	return 0;148}149 150static int fixpt_div32(u32 dividend, u32 divisor, u32 *quotient, u32 *fraction)151{152	u32 remainder;153	u32 q, f = 0;154	int i;155 156	if (0 == divisor)157		return -EINVAL;158 159	q = dividend / divisor;160	remainder = dividend - q * divisor;161 162	for (i = 0; i < 31; i++) {163		remainder <<= 1;164		if (remainder >= divisor) {165			f += 1;166			remainder -= divisor;167		}168		f <<= 1;169	}170 171	*quotient = q;172	*fraction = f;173 174	return 0;175}176 177static int max2165_set_rf(struct max2165_priv *priv, u32 freq)178{179	u8 tf;180	u8 tf_ntch;181	u32 t;182	u32 quotient, fraction;183	int ret;184 185	/* Set PLL divider according to RF frequency */186	ret = fixpt_div32(freq / 1000, priv->config->osc_clk * 1000,187			 &quotient, &fraction);188	if (ret != 0)189		return ret;190 191	/* 20-bit fraction */192	fraction >>= 12;193 194	max2165_write_reg(priv, REG_NDIV_INT, quotient);195	max2165_mask_write_reg(priv, REG_NDIV_FRAC2, 0x0F, fraction >> 16);196	max2165_write_reg(priv, REG_NDIV_FRAC1, fraction >> 8);197	max2165_write_reg(priv, REG_NDIV_FRAC0, fraction);198 199	/* Norch Filter */200	tf_ntch = (freq < 725000000) ?201		priv->tf_ntch_low_cfg : priv->tf_ntch_hi_cfg;202 203	/* Tracking filter balun */204	t = priv->tf_balun_low_ref;205	t += (priv->tf_balun_hi_ref - priv->tf_balun_low_ref)206		* (freq / 1000 - 470000) / (780000 - 470000);207 208	tf = t;209	dprintk("tf = %X\n", tf);210	tf |= tf_ntch << 4;211 212	max2165_write_reg(priv, REG_TRACK_FILTER, tf);213 214	return 0;215}216 217static void max2165_debug_status(struct max2165_priv *priv)218{219	u8 status, autotune;220	u8 auto_vco_success, auto_vco_active;221	u8 pll_locked;222	u8 dc_offset_low, dc_offset_hi;223	u8 signal_lv_over_threshold;224	u8 vco, vco_sub_band, adc;225 226	max2165_read_reg(priv, REG_STATUS, &status);227	max2165_read_reg(priv, REG_AUTOTUNE, &autotune);228 229	auto_vco_success = (status >> 6) & 0x01;230	auto_vco_active = (status >> 5) & 0x01;231	pll_locked = (status >> 4) & 0x01;232	dc_offset_low = (status >> 3) & 0x01;233	dc_offset_hi = (status >> 2) & 0x01;234	signal_lv_over_threshold = status & 0x01;235 236	vco = autotune >> 6;237	vco_sub_band = (autotune >> 3) & 0x7;238	adc = autotune & 0x7;239 240	dprintk("auto VCO active: %d, auto VCO success: %d\n",241		auto_vco_active, auto_vco_success);242	dprintk("PLL locked: %d\n", pll_locked);243	dprintk("DC offset low: %d, DC offset high: %d\n",244		dc_offset_low, dc_offset_hi);245	dprintk("Signal lvl over threshold: %d\n", signal_lv_over_threshold);246	dprintk("VCO: %d, VCO Sub-band: %d, ADC: %d\n", vco, vco_sub_band, adc);247}248 249static int max2165_set_params(struct dvb_frontend *fe)250{251	struct max2165_priv *priv = fe->tuner_priv;252	struct dtv_frontend_properties *c = &fe->dtv_property_cache;253	int ret;254 255	switch (c->bandwidth_hz) {256	case 7000000:257	case 8000000:258		priv->frequency = c->frequency;259		break;260	default:261		printk(KERN_INFO "MAX2165: bandwidth %d Hz not supported.\n",262		       c->bandwidth_hz);263		return -EINVAL;264	}265 266	dprintk("%s() frequency=%d\n", __func__, c->frequency);267 268	if (fe->ops.i2c_gate_ctrl)269		fe->ops.i2c_gate_ctrl(fe, 1);270	max2165_set_bandwidth(priv, c->bandwidth_hz);271	ret = max2165_set_rf(priv, priv->frequency);272	mdelay(50);273	max2165_debug_status(priv);274	if (fe->ops.i2c_gate_ctrl)275		fe->ops.i2c_gate_ctrl(fe, 0);276 277	if (ret != 0)278		return -EREMOTEIO;279 280	return 0;281}282 283static int max2165_get_frequency(struct dvb_frontend *fe, u32 *freq)284{285	struct max2165_priv *priv = fe->tuner_priv;286	dprintk("%s()\n", __func__);287	*freq = priv->frequency;288	return 0;289}290 291static int max2165_get_bandwidth(struct dvb_frontend *fe, u32 *bw)292{293	struct max2165_priv *priv = fe->tuner_priv;294	dprintk("%s()\n", __func__);295 296	*bw = priv->bandwidth;297	return 0;298}299 300static int max2165_get_status(struct dvb_frontend *fe, u32 *status)301{302	struct max2165_priv *priv = fe->tuner_priv;303	u16 lock_status = 0;304 305	dprintk("%s()\n", __func__);306 307	if (fe->ops.i2c_gate_ctrl)308			fe->ops.i2c_gate_ctrl(fe, 1);309 310	max2165_debug_status(priv);311	*status = lock_status;312 313	if (fe->ops.i2c_gate_ctrl)314			fe->ops.i2c_gate_ctrl(fe, 0);315 316	return 0;317}318 319static int max2165_sleep(struct dvb_frontend *fe)320{321	dprintk("%s()\n", __func__);322	return 0;323}324 325static int max2165_init(struct dvb_frontend *fe)326{327	struct max2165_priv *priv = fe->tuner_priv;328	dprintk("%s()\n", __func__);329 330	if (fe->ops.i2c_gate_ctrl)331		fe->ops.i2c_gate_ctrl(fe, 1);332 333	/* Setup initial values */334	/* Fractional Mode on */335	max2165_write_reg(priv, REG_NDIV_FRAC2, 0x18);336	/* LNA on */337	max2165_write_reg(priv, REG_LNA, 0x01);338	max2165_write_reg(priv, REG_PLL_CFG, 0x7A);339	max2165_write_reg(priv, REG_TEST, 0x08);340	max2165_write_reg(priv, REG_SHUTDOWN, 0x40);341	max2165_write_reg(priv, REG_VCO_CTRL, 0x84);342	max2165_write_reg(priv, REG_BASEBAND_CTRL, 0xC3);343	max2165_write_reg(priv, REG_DC_OFFSET_CTRL, 0x75);344	max2165_write_reg(priv, REG_DC_OFFSET_DAC, 0x00);345	max2165_write_reg(priv, REG_ROM_TABLE_ADDR, 0x00);346 347	max2165_set_osc(priv, priv->config->osc_clk);348 349	max2165_read_rom_table(priv);350 351	max2165_set_bandwidth(priv, 8000000);352 353	if (fe->ops.i2c_gate_ctrl)354			fe->ops.i2c_gate_ctrl(fe, 0);355 356	return 0;357}358 359static void max2165_release(struct dvb_frontend *fe)360{361	struct max2165_priv *priv = fe->tuner_priv;362	dprintk("%s()\n", __func__);363 364	kfree(priv);365	fe->tuner_priv = NULL;366}367 368static const struct dvb_tuner_ops max2165_tuner_ops = {369	.info = {370		.name              = "Maxim MAX2165",371		.frequency_min_hz  = 470 * MHz,372		.frequency_max_hz  = 862 * MHz,373		.frequency_step_hz =  50 * kHz,374	},375 376	.release	   = max2165_release,377	.init		   = max2165_init,378	.sleep		   = max2165_sleep,379 380	.set_params	   = max2165_set_params,381	.set_analog_params = NULL,382	.get_frequency	   = max2165_get_frequency,383	.get_bandwidth	   = max2165_get_bandwidth,384	.get_status	   = max2165_get_status385};386 387struct dvb_frontend *max2165_attach(struct dvb_frontend *fe,388				   struct i2c_adapter *i2c,389				   struct max2165_config *cfg)390{391	struct max2165_priv *priv = NULL;392 393	dprintk("%s(%d-%04x)\n", __func__,394		i2c ? i2c_adapter_id(i2c) : -1,395		cfg ? cfg->i2c_address : -1);396 397	priv = kzalloc(sizeof(struct max2165_priv), GFP_KERNEL);398	if (priv == NULL)399		return NULL;400 401	memcpy(&fe->ops.tuner_ops, &max2165_tuner_ops,402		sizeof(struct dvb_tuner_ops));403 404	priv->config = cfg;405	priv->i2c = i2c;406	fe->tuner_priv = priv;407 408	max2165_init(fe);409	max2165_debug_status(priv);410 411	return fe;412}413EXPORT_SYMBOL_GPL(max2165_attach);414 415MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");416MODULE_DESCRIPTION("Maxim MAX2165 silicon tuner driver");417MODULE_LICENSE("GPL");418