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tvpll.c revision 1.3 
      1 /* $NetBSD: tvpll.c,v 1.3 2011/07/15 03:31:37 jmcneill Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2008, 2011 Jonathan A. Kollasch
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
     20  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     21  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     22  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     23  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     24  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     25  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     26  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: tvpll.c,v 1.3 2011/07/15 03:31:37 jmcneill Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/systm.h>
     34 #include <sys/device.h>
     35 #include <sys/kmem.h>
     36 #include <sys/syslog.h>
     37 #include <sys/module.h>
     38 
     39 #include <dev/dtv/dtvio.h>
     40 #include <dev/i2c/i2cvar.h>
     41 #include <dev/i2c/tvpllvar.h>
     42 
     43 struct tvpll {
     44 	device_t		parent;
     45 	i2c_tag_t		tag;
     46 	i2c_addr_t		addr;
     47 	const struct tvpll_data *	pll;
     48 	uint32_t		frequency;
     49 };
     50 
     51 static uint32_t tvpll_algo(struct tvpll *, uint8_t *,
     52 		const struct dvb_frontend_parameters *, uint32_t *);
     53 
     54 struct tvpll *
     55 tvpll_open(device_t parent, i2c_tag_t t, i2c_addr_t a, struct tvpll_data *p)
     56 {
     57 	struct tvpll *tvpll;
     58 	int rv;
     59 
     60 	tvpll = kmem_alloc(sizeof(struct tvpll), KM_SLEEP);
     61         if (tvpll == NULL)
     62                 return NULL;
     63 
     64 	tvpll->tag = t;
     65 	tvpll->addr = a;
     66 
     67 	tvpll->pll = p;
     68 
     69 	if (tvpll->pll->initdata) {
     70 		iic_acquire_bus(tvpll->tag, I2C_F_POLL);
     71 		rv = iic_exec(tvpll->tag, I2C_OP_WRITE_WITH_STOP, tvpll->addr,
     72 		    &tvpll->pll->initdata[1], tvpll->pll->initdata[0],
     73 		    NULL, 0, I2C_F_POLL);
     74 		iic_release_bus(tvpll->tag, I2C_F_POLL);
     75 	}
     76 
     77 	device_printf(parent, "tvpll: %s\n", tvpll->pll->name);
     78 
     79 	return tvpll;
     80 }
     81 
     82 void
     83 tvpll_close(struct tvpll *tvpll)
     84 {
     85 	kmem_free(tvpll, sizeof(*tvpll));
     86 }
     87 
     88 static uint32_t
     89 tvpll_algo(struct tvpll *tvpll, uint8_t *b,
     90     const struct dvb_frontend_parameters *p, uint32_t *fr)
     91 {
     92 	const struct tvpll_data *pll;
     93 	uint32_t d;
     94 	int i;
     95 
     96 	pll = tvpll->pll;
     97 
     98 	if(p->frequency != 0 &&
     99 	    (p->frequency < pll->min || p->frequency > pll->max))
    100 		return 0;
    101 
    102 	for(i = 0; i < pll->count; i++) {
    103 		if (p->frequency > pll->entries[i].limit)
    104 			continue;
    105 		else
    106 			break;
    107 	}
    108 
    109 	if ( i >= pll->count)
    110 		return EINVAL;
    111 
    112 	d = (p->frequency + pll->iffreq) / pll->entries[i].stepsize;
    113 
    114 	b[0] = (d >> 8) & 0xff;
    115 	b[1] = (d >> 0) & 0xff;
    116 	b[2] = pll->entries[i].config;
    117 	b[3] = pll->entries[i].cb;
    118 	b[4] = pll->entries[i].aux;
    119 
    120 	*fr = (d * pll->entries[i].stepsize) - pll->iffreq;
    121 
    122 	log(LOG_DEBUG, "pllw %d %02x %02x %02x %02x %02x\n", *fr, b[0], b[1], b[2], b[3], b[4]);
    123 	return 0;
    124 }
    125 
    126 int
    127 tvpll_tune_dtv(struct tvpll *tvpll,
    128     const struct dvb_frontend_parameters *params)
    129 {
    130 	int rv;
    131 	uint32_t fr;
    132 	uint8_t b[5], ab[2];
    133 
    134 	fr = 0;
    135 
    136 	if((rv = tvpll_algo(tvpll, b, params, &fr)) != 0)
    137 		return rv;
    138 
    139 	iic_acquire_bus(tvpll->tag, I2C_F_POLL);
    140 	/* gate ctrl? */
    141 	if (b[4] != TVPLL_IGNORE_AUX) {
    142 		ab[0] = b[2] | 0x18;
    143 		ab[1] = b[4];
    144 		rv = iic_exec(tvpll->tag, I2C_OP_WRITE_WITH_STOP, tvpll->addr, ab, 2, NULL, 0, I2C_F_POLL);
    145 	}
    146 	rv = iic_exec(tvpll->tag, I2C_OP_WRITE_WITH_STOP, tvpll->addr, b, 4, NULL, 0, I2C_F_POLL);
    147 	iic_release_bus(tvpll->tag, I2C_F_POLL);
    148 
    149 	if (rv != 0)
    150 		printf("%s\n", __func__);
    151 
    152 	tvpll->frequency = fr;
    153 
    154 	return rv;
    155 }
    156 
    157 MODULE(MODULE_CLASS_DRIVER, tvpll, NULL);
    158 
    159 static int
    160 tvpll_modcmd(modcmd_t cmd, void *opaque)
    161 {
    162 	if (cmd == MODULE_CMD_INIT || cmd == MODULE_CMD_FINI)
    163 		return 0;
    164 	return ENOTTY;
    165 }
    166