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// SPDX-License-Identifier: GPL-2.0
/*
* Sharp QM1D1B0004 satellite tuner
*
* Copyright (C) 2014 Akihiro Tsukada <tskd08@gmail.com>
*
* based on (former) drivers/media/pci/pt1/va1j5jf8007s.c.
*/
/*
* Note:
* Since the data-sheet of this tuner chip is not available,
* this driver lacks some tuner_ops and config options.
* In addition, the implementation might be dependent on the specific use
* in the FE module: VA1J5JF8007S and/or in the product: Earthsoft PT1/PT2.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <media/dvb_frontend.h>
#include "qm1d1b0004.h"
/*
* Tuner I/F (copied from the former va1j5jf8007s.c)
* b[0] I2C addr
* b[1] "0":1, BG:2, divider_quotient[7:3]:5
* b[2] divider_quotient[2:0]:3, divider_remainder:5
* b[3] "111":3, LPF[3:2]:2, TM:1, "0":1, REF:1
* b[4] BANDX, PSC:1, LPF[1:0]:2, DIV:1, "0":1
*
* PLL frequency step :=
* REF == 0 -> PLL XTL frequency(4MHz) / 8
* REF == 1 -> PLL XTL frequency(4MHz) / 4
*
* PreScaler :=
* PSC == 0 -> x32
* PSC == 1 -> x16
*
* divider_quotient := (frequency / PLL frequency step) / PreScaler
* divider_remainder := (frequency / PLL frequency step) % PreScaler
*
* LPF := LPF Frequency / 1000 / 2 - 2
* LPF Frequency @ baudrate=28.86Mbps = 30000
*
* band (1..9)
* band 1 (freq < 986000) -> DIV:1, BANDX:5, PSC:1
* band 2 (freq < 1072000) -> DIV:1, BANDX:6, PSC:1
* band 3 (freq < 1154000) -> DIV:1, BANDX:7, PSC:0
* band 4 (freq < 1291000) -> DIV:0, BANDX:1, PSC:0
* band 5 (freq < 1447000) -> DIV:0, BANDX:2, PSC:0
* band 6 (freq < 1615000) -> DIV:0, BANDX:3, PSC:0
* band 7 (freq < 1791000) -> DIV:0, BANDX:4, PSC:0
* band 8 (freq < 1972000) -> DIV:0, BANDX:5, PSC:0
* band 9 (freq < 2150000) -> DIV:0, BANDX:6, PSC:0
*/
#define QM1D1B0004_PSC_MASK (1 << 4)
#define QM1D1B0004_XTL_FREQ 4000
#define QM1D1B0004_LPF_FALLBACK 30000
#if 0 /* Currently unused */
static const struct qm1d1b0004_config default_cfg = {
.lpf_freq = QM1D1B0004_CFG_LPF_DFLT,
.half_step = false,
};
#endif
struct qm1d1b0004_state {
struct qm1d1b0004_config cfg;
struct i2c_client *i2c;
};
struct qm1d1b0004_cb_map {
u32 frequency;
u8 cb;
};
static const struct qm1d1b0004_cb_map cb_maps[] = {
{ 986000, 0xb2 },
{ 1072000, 0xd2 },
{ 1154000, 0xe2 },
{ 1291000, 0x20 },
{ 1447000, 0x40 },
{ 1615000, 0x60 },
{ 1791000, 0x80 },
{ 1972000, 0xa0 },
};
static u8 lookup_cb(u32 frequency)
{
int i;
const struct qm1d1b0004_cb_map *map;
for (i = 0; i < ARRAY_SIZE(cb_maps); i++) {
map = &cb_maps[i];
if (frequency < map->frequency)
return map->cb;
}
return 0xc0;
}
static int qm1d1b0004_set_params(struct dvb_frontend *fe)
{
struct qm1d1b0004_state *state;
u32 frequency, pll, lpf_freq;
u16 word;
u8 buf[4], cb, lpf;
int ret;
state = fe->tuner_priv;
frequency = fe->dtv_property_cache.frequency;
pll = QM1D1B0004_XTL_FREQ / 4;
if (state->cfg.half_step)
pll /= 2;
word = DIV_ROUND_CLOSEST(frequency, pll);
cb = lookup_cb(frequency);
if (cb & QM1D1B0004_PSC_MASK)
word = (word << 1 & ~0x1f) | (word & 0x0f);
/* step.1: set frequency with BG:2, TM:0(4MHZ), LPF:4MHz */
buf[0] = 0x40 | word >> 8;
buf[1] = word;
/* inconsisnten with the above I/F doc. maybe the doc is wrong */
buf[2] = 0xe0 | state->cfg.half_step;
buf[3] = cb;
ret = i2c_master_send(state->i2c, buf, 4);
if (ret < 0)
return ret;
/* step.2: set TM:1 */
buf[0] = 0xe4 | state->cfg.half_step;
ret = i2c_master_send(state->i2c, buf, 1);
if (ret < 0)
return ret;
msleep(20);
/* step.3: set LPF */
lpf_freq = state->cfg.lpf_freq;
if (lpf_freq == QM1D1B0004_CFG_LPF_DFLT)
lpf_freq = fe->dtv_property_cache.symbol_rate / 1000;
if (lpf_freq == 0)
lpf_freq = QM1D1B0004_LPF_FALLBACK;
lpf = DIV_ROUND_UP(lpf_freq, 2000) - 2;
buf[0] = 0xe4 | ((lpf & 0x0c) << 1) | state->cfg.half_step;
buf[1] = cb | ((lpf & 0x03) << 2);
ret = i2c_master_send(state->i2c, buf, 2);
if (ret < 0)
return ret;
/* step.4: read PLL lock? */
buf[0] = 0;
ret = i2c_master_recv(state->i2c, buf, 1);
if (ret < 0)
return ret;
return 0;
}
static int qm1d1b0004_set_config(struct dvb_frontend *fe, void *priv_cfg)
{
struct qm1d1b0004_state *state;
state = fe->tuner_priv;
memcpy(&state->cfg, priv_cfg, sizeof(state->cfg));
return 0;
}
static int qm1d1b0004_init(struct dvb_frontend *fe)
{
struct qm1d1b0004_state *state;
u8 buf[2] = {0xf8, 0x04};
state = fe->tuner_priv;
if (state->cfg.half_step)
buf[0] |= 0x01;
return i2c_master_send(state->i2c, buf, 2);
}
static const struct dvb_tuner_ops qm1d1b0004_ops = {
.info = {
.name = "Sharp qm1d1b0004",
.frequency_min_hz = 950 * MHz,
.frequency_max_hz = 2150 * MHz,
},
.init = qm1d1b0004_init,
.set_params = qm1d1b0004_set_params,
.set_config = qm1d1b0004_set_config,
};
static int
qm1d1b0004_probe(struct i2c_client *client)
{
struct dvb_frontend *fe;
struct qm1d1b0004_config *cfg;
struct qm1d1b0004_state *state;
int ret;
cfg = client->dev.platform_data;
fe = cfg->fe;
i2c_set_clientdata(client, fe);
fe->tuner_priv = kzalloc(sizeof(struct qm1d1b0004_state), GFP_KERNEL);
if (!fe->tuner_priv) {
ret = -ENOMEM;
goto err_mem;
}
memcpy(&fe->ops.tuner_ops, &qm1d1b0004_ops, sizeof(fe->ops.tuner_ops));
state = fe->tuner_priv;
state->i2c = client;
ret = qm1d1b0004_set_config(fe, cfg);
if (ret != 0)
goto err_priv;
dev_info(&client->dev, "Sharp QM1D1B0004 attached.\n");
return 0;
err_priv:
kfree(fe->tuner_priv);
err_mem:
fe->tuner_priv = NULL;
return ret;
}
static void qm1d1b0004_remove(struct i2c_client *client)
{
struct dvb_frontend *fe;
fe = i2c_get_clientdata(client);
kfree(fe->tuner_priv);
fe->tuner_priv = NULL;
}
static const struct i2c_device_id qm1d1b0004_id[] = {
{"qm1d1b0004", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, qm1d1b0004_id);
static struct i2c_driver qm1d1b0004_driver = {
.driver = {
.name = "qm1d1b0004",
},
.probe_new = qm1d1b0004_probe,
.remove = qm1d1b0004_remove,
.id_table = qm1d1b0004_id,
};
module_i2c_driver(qm1d1b0004_driver);
MODULE_DESCRIPTION("Sharp QM1D1B0004");
MODULE_AUTHOR("Akihiro Tsukada");
MODULE_LICENSE("GPL");
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