diff options
Diffstat (limited to 'drivers/media/tuners/qm1d1b0004.c')
| -rw-r--r-- | drivers/media/tuners/qm1d1b0004.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/drivers/media/tuners/qm1d1b0004.c b/drivers/media/tuners/qm1d1b0004.c new file mode 100644 index 000000000000..9dac1b875c18 --- /dev/null +++ b/drivers/media/tuners/qm1d1b0004.c @@ -0,0 +1,264 @@ +// 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 + +static const struct qm1d1b0004_config default_cfg = { + .lpf_freq = QM1D1B0004_CFG_LPF_DFLT, + .half_step = false, +}; + +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 = 950000, + .frequency_max = 2150000, + }, + + .init = qm1d1b0004_init, + + .set_params = qm1d1b0004_set_params, + .set_config = qm1d1b0004_set_config, +}; + +static int +qm1d1b0004_probe(struct i2c_client *client, const struct i2c_device_id *id) +{ + 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 int qm1d1b0004_remove(struct i2c_client *client) +{ + struct dvb_frontend *fe; + + fe = i2c_get_clientdata(client); + kfree(fe->tuner_priv); + fe->tuner_priv = NULL; + return 0; +} + + +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 = 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"); |