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/* (C) 2005-2011 by maintech GmbH
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* (C) 2011-2012 by Harald Welte <laforge@gnumonks.org>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <time.h>
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#include <math.h>
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#include <stdio.h>
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#include <errno.h>
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#include <si570.h>
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#include <logging.h>
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#include <utility/trace.h>
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#include <twi/twid.h>
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static void udelay(uint32_t usec)
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{
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uint32_t i, j;
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volatile uint32_t k;
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for (i = 0; i < usec; i++) {
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for (j = 0; j < 0xff; j++) {
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k = 0;
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}
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}
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}
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static int smbus8_read_bytes(void *i2c, uint8_t addr, uint8_t reg_nr,
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uint8_t *out, uint8_t num)
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{
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unsigned char rc;
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rc = TWID_Read(i2c, addr, reg_nr, 1, out, num, NULL);
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if (rc != 0) {
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LOGP(DVCO, LOGL_ERROR, "Error %u in TWID_Read\n", rc);
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return -EIO;
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}
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return rc;
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}
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static int smbus8_read_byte(void *i2c, uint8_t addr, uint8_t reg_nr,
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uint8_t *val)
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{
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return smbus8_read_bytes(i2c, addr, reg_nr, val, 1);
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}
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static int smbus8_write_bytes(void *i2c, uint8_t addr, uint8_t reg_nr,
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uint8_t *val, uint8_t num)
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{
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unsigned char rc;
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rc = TWID_Write(i2c, addr, reg_nr, 1, val, num, NULL);
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if (rc != 0) {
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LOGP(DVCO, LOGL_ERROR, "Error %u in TWID_Write\n", rc);
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return -EIO;
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}
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return rc;
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}
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static int smbus8_write_byte(void *i2c, uint8_t addr, uint8_t reg_nr,
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uint8_t val)
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{
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return smbus8_write_bytes(i2c, addr, reg_nr, &val, 1);
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}
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static const struct si570_info si570_data[2] = {
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{.freq_range = {{.min=10000, .max=945000}, {.min=970000, .max=1134000}, {.min=1213000, .max=1417500}}, .init_freq=856000 },
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{.freq_range = {{.min=10000, .max=280000}}, .init_freq=100000 },
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};
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//init module
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int si570_init(struct si570_ctx *ctx, void *i2c_dev, uint8_t i2c_addr)
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{
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ctx->i2c = i2c_dev;
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ctx->slave_addr = i2c_addr;
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ctx->init = 0;
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return si570_reinit(ctx);
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}
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int si570_reinit(struct si570_ctx *ctx)
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{
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TRACE_DEBUG("si570_init()\r\n");
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if (0 != si570_reset(ctx)) {
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TRACE_DEBUG("SI570 reset failed.\n");
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return -EIO;
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}
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TRACE_DEBUG("si570_init():2\r\n");
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if (0 != si570_read_calibration(ctx)) {
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TRACE_DEBUG("SI570 init failed.\n");
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return -EIO;
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}
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TRACE_DEBUG("si570_init():3\r\n");
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ctx->init = 1;
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return 0;
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}
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void si570_print_info(struct si570_ctx *ctx)
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{
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TRACE_DEBUG("SI570 XTAL: %u Hz REF: %u Hz\n", ctx->xtal >> 3, ctx->info->init_freq * 1000);
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}
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static int hs_to_div(int n1)
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{
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switch (n1) {
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case 0: return 4;
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case 1: return 5;
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case 2: return 6;
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case 3: return 7;
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case 5: return 9;
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case 7: return 11;
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}
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return 0;
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}
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int si570_reset(struct si570_ctx *ctx)
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{
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TRACE_DEBUG("si570_reset:1\r\n");
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smbus8_write_byte(ctx->i2c, ctx->slave_addr, 135, 80);
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udelay(1000);
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TRACE_DEBUG("si570_reset:2\r\n");
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smbus8_write_byte(ctx->i2c, ctx->slave_addr, 135, 01);
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udelay(1000);
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TRACE_DEBUG("si570_reset:3\r\n");
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return 0;
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}
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int si570_read_calibration(struct si570_ctx *ctx)
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{
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int n;
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int res;
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uint8_t data[6];
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uint64_t xd, xf;
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int n1, hs_div;
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TRACE_DEBUG("si570_read_calib:1\r\n");
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if (0 != (res = smbus8_read_bytes(ctx->i2c, ctx->slave_addr, 7, data, 6))) {
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TRACE_DEBUG ("SI570 calibration read error (%i)\n", res);
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return -EINVAL;
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}
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TRACE_DEBUG("si570_read_calib:2\r\n");
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xd = data[1] & 0x3F;
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xd <<= 8;
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xd |= data[2];
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xd <<= 8;
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xd |= data[3];
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xd <<= 8;
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xd |= data[4];
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xd <<= 8;
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xd |= data[5];
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TRACE_DEBUG("si570_read_calib:2b\r\n");
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n1 = ((data[0] << 2) & 0x1F) | (data[1] >> 6);
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hs_div = (data[0] >> 5);
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TRACE_DEBUG("si570_read_calib:2c\r\n");
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n = 1; if (xd > 0) {
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//for (n=0; n<2; n++) {
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TRACE_DEBUG("si570_read_calib:2d\r\n");
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xf = si570_data[n].init_freq * 1000;
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TRACE_DEBUG("si570_read_calib:2e\r\n");
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xf *= hs_to_div(hs_div) * (n1+1);
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TRACE_DEBUG("si570_read_calib:2f\r\n");
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xf<<=31;
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TRACE_DEBUG("si570_read_calib:2g\r\n");
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ctx->xtal = (xf + (xd/2)) / xd;
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TRACE_DEBUG("si570_read_calib:2h\r\n");
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ctx->info = &si570_data[n];
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TRACE_DEBUG("si570_read_calib:3\r\n");
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return 0;
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}
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return -EINVAL;
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}
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//set frequency
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int si570_set_freq(struct si570_ctx *ctx, uint32_t freq, int trim)
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{
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uint32_t dco_min = 4850000ULL;
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int mul, hsv, n1;
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int freq_in_range = 0;
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ctx->lock = 0;
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for (mul = (dco_min / freq) + 1; (freq * mul) <= 5670000; mul++) {
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for (hsv=7; hsv>=0; hsv--) {
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int hsdiv = hs_to_div(hsv);
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if (!hsdiv) continue;
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if (mul%hsdiv) continue;
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n1 = mul / hsdiv;
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if (n1 > 128) continue;
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if (n1 != 1) {
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if (n1 < 1) continue;
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if (n1 % 2) continue;
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}
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goto found_solution;
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}
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}
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TRACE_DEBUG("SI570 no solution\n");
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return -EINVAL;
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found_solution:
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{
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uint8_t data[6];
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uint64_t xf, xd, xr;
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uint32_t n1v;
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xf = freq;
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xf*= 1000;
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xf+= trim;
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xd = hs_to_div(hsv) * n1 * xf;
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xd<<=31;
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xr = (xd + ctx->xtal/2) / ctx->xtal;
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n1v= n1 - 1;
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data[0] = (hsv << 5) | (n1v>> 2);
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data[1] = (n1v << 6) | (xr >> 32);
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data[2] = (xr >> 24);
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data[3] = (xr >> 16);
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data[4] = (xr >> 8);
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data[5] = (xr >> 0);
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smbus8_write_byte(ctx->i2c, ctx->slave_addr, 137, 0x10);
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smbus8_write_bytes(ctx->i2c,ctx->slave_addr, 7, data, 6);
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smbus8_write_byte(ctx->i2c, ctx->slave_addr, 137, 0x00);
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smbus8_write_byte(ctx->i2c, ctx->slave_addr, 135, 0x40);
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ctx->lock = 1;
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}
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return 0;
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}
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int si570_get_lock(struct si570_ctx *ctx)
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{
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return ctx->init && ctx->lock;
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}
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//dump all registers
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void si570_regdump(struct si570_ctx *ctx)
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{
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uint8_t data[8];
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if (!ctx->init) {
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TRACE_DEBUG("SI570 not initialized\n");
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return;
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}
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smbus8_read_bytes(ctx->i2c, ctx->slave_addr, 7, data, 6);
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smbus8_read_byte(ctx->i2c, ctx->slave_addr, 135, &data[6]);
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smbus8_read_byte(ctx->i2c, ctx->slave_addr, 137, &data[7]);
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TRACE_DEBUG("SI570 regs: %02X %02X %02X %02X %02X %02X %02X %02X\n",
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data[0], data[1], data[2], data[3],
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data[4], data[5], data[6], data[7]);
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}
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//write register(s)
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int si570_reg_write(struct si570_ctx *ctx, uint8_t reg, int len, const uint8_t* data)
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{
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return smbus8_write_bytes(ctx->i2c, ctx->slave_addr, reg, data, len);
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}
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