diff options
Diffstat (limited to 'drivers/media/dvb-frontends/stv6110.c')
| -rw-r--r-- | drivers/media/dvb-frontends/stv6110.c | 437 |
1 files changed, 437 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/stv6110.c b/drivers/media/dvb-frontends/stv6110.c new file mode 100644 index 000000000..1cf9c095d --- /dev/null +++ b/drivers/media/dvb-frontends/stv6110.c @@ -0,0 +1,437 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * stv6110.c + * + * Driver for ST STV6110 satellite tuner IC. + * + * Copyright (C) 2009 NetUP Inc. + * Copyright (C) 2009 Igor M. Liplianin <liplianin@netup.ru> + */ + +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/dvb/frontend.h> + +#include <linux/types.h> + +#include "stv6110.h" + +/* Max transfer size done by I2C transfer functions */ +#define MAX_XFER_SIZE 64 + +static int debug; + +struct stv6110_priv { + int i2c_address; + struct i2c_adapter *i2c; + + u32 mclk; + u8 clk_div; + u8 gain; + u8 regs[8]; +}; + +#define dprintk(args...) \ + do { \ + if (debug) \ + printk(KERN_DEBUG args); \ + } while (0) + +static s32 abssub(s32 a, s32 b) +{ + if (a > b) + return a - b; + else + return b - a; +}; + +static void stv6110_release(struct dvb_frontend *fe) +{ + kfree(fe->tuner_priv); + fe->tuner_priv = NULL; +} + +static int stv6110_write_regs(struct dvb_frontend *fe, u8 buf[], + int start, int len) +{ + struct stv6110_priv *priv = fe->tuner_priv; + int rc; + u8 cmdbuf[MAX_XFER_SIZE]; + struct i2c_msg msg = { + .addr = priv->i2c_address, + .flags = 0, + .buf = cmdbuf, + .len = len + 1 + }; + + dprintk("%s\n", __func__); + + if (1 + len > sizeof(cmdbuf)) { + printk(KERN_WARNING + "%s: i2c wr: len=%d is too big!\n", + KBUILD_MODNAME, len); + return -EINVAL; + } + + if (start + len > 8) + return -EINVAL; + + memcpy(&cmdbuf[1], buf, len); + cmdbuf[0] = start; + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + + rc = i2c_transfer(priv->i2c, &msg, 1); + if (rc != 1) + dprintk("%s: i2c error\n", __func__); + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 0); + + return 0; +} + +static int stv6110_read_regs(struct dvb_frontend *fe, u8 regs[], + int start, int len) +{ + struct stv6110_priv *priv = fe->tuner_priv; + int rc; + u8 reg[] = { start }; + struct i2c_msg msg[] = { + { + .addr = priv->i2c_address, + .flags = 0, + .buf = reg, + .len = 1, + }, { + .addr = priv->i2c_address, + .flags = I2C_M_RD, + .buf = regs, + .len = len, + }, + }; + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + + rc = i2c_transfer(priv->i2c, msg, 2); + if (rc != 2) + dprintk("%s: i2c error\n", __func__); + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 0); + + memcpy(&priv->regs[start], regs, len); + + return 0; +} + +static int stv6110_read_reg(struct dvb_frontend *fe, int start) +{ + u8 buf[] = { 0 }; + stv6110_read_regs(fe, buf, start, 1); + + return buf[0]; +} + +static int stv6110_sleep(struct dvb_frontend *fe) +{ + u8 reg[] = { 0 }; + stv6110_write_regs(fe, reg, 0, 1); + + return 0; +} + +static u32 carrier_width(u32 symbol_rate, enum fe_rolloff rolloff) +{ + u32 rlf; + + switch (rolloff) { + case ROLLOFF_20: + rlf = 20; + break; + case ROLLOFF_25: + rlf = 25; + break; + default: + rlf = 35; + break; + } + + return symbol_rate + ((symbol_rate * rlf) / 100); +} + +static int stv6110_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth) +{ + struct stv6110_priv *priv = fe->tuner_priv; + u8 r8, ret = 0x04; + int i; + + if ((bandwidth / 2) > 36000000) /*BW/2 max=31+5=36 mhz for r8=31*/ + r8 = 31; + else if ((bandwidth / 2) < 5000000) /* BW/2 min=5Mhz for F=0 */ + r8 = 0; + else /*if 5 < BW/2 < 36*/ + r8 = (bandwidth / 2) / 1000000 - 5; + + /* ctrl3, RCCLKOFF = 0 Activate the calibration Clock */ + /* ctrl3, CF = r8 Set the LPF value */ + priv->regs[RSTV6110_CTRL3] &= ~((1 << 6) | 0x1f); + priv->regs[RSTV6110_CTRL3] |= (r8 & 0x1f); + stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL3], RSTV6110_CTRL3, 1); + /* stat1, CALRCSTRT = 1 Start LPF auto calibration*/ + priv->regs[RSTV6110_STAT1] |= 0x02; + stv6110_write_regs(fe, &priv->regs[RSTV6110_STAT1], RSTV6110_STAT1, 1); + + i = 0; + /* Wait for CALRCSTRT == 0 */ + while ((i < 10) && (ret != 0)) { + ret = ((stv6110_read_reg(fe, RSTV6110_STAT1)) & 0x02); + mdelay(1); /* wait for LPF auto calibration */ + i++; + } + + /* RCCLKOFF = 1 calibration done, deactivate the calibration Clock */ + priv->regs[RSTV6110_CTRL3] |= (1 << 6); + stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL3], RSTV6110_CTRL3, 1); + return 0; +} + +static int stv6110_init(struct dvb_frontend *fe) +{ + struct stv6110_priv *priv = fe->tuner_priv; + u8 buf0[] = { 0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e }; + + memcpy(priv->regs, buf0, 8); + /* K = (Reference / 1000000) - 16 */ + priv->regs[RSTV6110_CTRL1] &= ~(0x1f << 3); + priv->regs[RSTV6110_CTRL1] |= + ((((priv->mclk / 1000000) - 16) & 0x1f) << 3); + + /* divisor value for the output clock */ + priv->regs[RSTV6110_CTRL2] &= ~0xc0; + priv->regs[RSTV6110_CTRL2] |= (priv->clk_div << 6); + + stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL1], RSTV6110_CTRL1, 8); + msleep(1); + stv6110_set_bandwidth(fe, 72000000); + + return 0; +} + +static int stv6110_get_frequency(struct dvb_frontend *fe, u32 *frequency) +{ + struct stv6110_priv *priv = fe->tuner_priv; + u32 nbsteps, divider, psd2, freq; + u8 regs[] = { 0, 0, 0, 0, 0, 0, 0, 0 }; + + stv6110_read_regs(fe, regs, 0, 8); + /*N*/ + divider = (priv->regs[RSTV6110_TUNING2] & 0x0f) << 8; + divider += priv->regs[RSTV6110_TUNING1]; + + /*R*/ + nbsteps = (priv->regs[RSTV6110_TUNING2] >> 6) & 3; + /*p*/ + psd2 = (priv->regs[RSTV6110_TUNING2] >> 4) & 1; + + freq = divider * (priv->mclk / 1000); + freq /= (1 << (nbsteps + psd2)); + freq /= 4; + + *frequency = freq; + + return 0; +} + +static int stv6110_set_frequency(struct dvb_frontend *fe, u32 frequency) +{ + struct stv6110_priv *priv = fe->tuner_priv; + u8 ret = 0x04; + u32 divider, ref, p, presc, i, result_freq, vco_freq; + s32 p_calc, p_calc_opt = 1000, r_div, r_div_opt = 0, p_val; + + dprintk("%s, freq=%d kHz, mclk=%d Hz\n", __func__, + frequency, priv->mclk); + + /* K = (Reference / 1000000) - 16 */ + priv->regs[RSTV6110_CTRL1] &= ~(0x1f << 3); + priv->regs[RSTV6110_CTRL1] |= + ((((priv->mclk / 1000000) - 16) & 0x1f) << 3); + + /* BB_GAIN = db/2 */ + priv->regs[RSTV6110_CTRL2] &= ~0x0f; + priv->regs[RSTV6110_CTRL2] |= (priv->gain & 0x0f); + + if (frequency <= 1023000) { + p = 1; + presc = 0; + } else if (frequency <= 1300000) { + p = 1; + presc = 1; + } else if (frequency <= 2046000) { + p = 0; + presc = 0; + } else { + p = 0; + presc = 1; + } + /* DIV4SEL = p*/ + priv->regs[RSTV6110_TUNING2] &= ~(1 << 4); + priv->regs[RSTV6110_TUNING2] |= (p << 4); + + /* PRESC32ON = presc */ + priv->regs[RSTV6110_TUNING2] &= ~(1 << 5); + priv->regs[RSTV6110_TUNING2] |= (presc << 5); + + p_val = (int)(1 << (p + 1)) * 10;/* P = 2 or P = 4 */ + for (r_div = 0; r_div <= 3; r_div++) { + p_calc = (priv->mclk / 100000); + p_calc /= (1 << (r_div + 1)); + if ((abssub(p_calc, p_val)) < (abssub(p_calc_opt, p_val))) + r_div_opt = r_div; + + p_calc_opt = (priv->mclk / 100000); + p_calc_opt /= (1 << (r_div_opt + 1)); + } + + ref = priv->mclk / ((1 << (r_div_opt + 1)) * (1 << (p + 1))); + divider = (((frequency * 1000) + (ref >> 1)) / ref); + + /* RDIV = r_div_opt */ + priv->regs[RSTV6110_TUNING2] &= ~(3 << 6); + priv->regs[RSTV6110_TUNING2] |= (((r_div_opt) & 3) << 6); + + /* NDIV_MSB = MSB(divider) */ + priv->regs[RSTV6110_TUNING2] &= ~0x0f; + priv->regs[RSTV6110_TUNING2] |= (((divider) >> 8) & 0x0f); + + /* NDIV_LSB, LSB(divider) */ + priv->regs[RSTV6110_TUNING1] = (divider & 0xff); + + /* CALVCOSTRT = 1 VCO Auto Calibration */ + priv->regs[RSTV6110_STAT1] |= 0x04; + stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL1], + RSTV6110_CTRL1, 8); + + i = 0; + /* Wait for CALVCOSTRT == 0 */ + while ((i < 10) && (ret != 0)) { + ret = ((stv6110_read_reg(fe, RSTV6110_STAT1)) & 0x04); + msleep(1); /* wait for VCO auto calibration */ + i++; + } + + ret = stv6110_read_reg(fe, RSTV6110_STAT1); + stv6110_get_frequency(fe, &result_freq); + + vco_freq = divider * ((priv->mclk / 1000) / ((1 << (r_div_opt + 1)))); + dprintk("%s, stat1=%x, lo_freq=%d kHz, vco_frec=%d kHz\n", __func__, + ret, result_freq, vco_freq); + + return 0; +} + +static int stv6110_set_params(struct dvb_frontend *fe) +{ + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + u32 bandwidth = carrier_width(c->symbol_rate, c->rolloff); + + stv6110_set_frequency(fe, c->frequency); + stv6110_set_bandwidth(fe, bandwidth); + + return 0; +} + +static int stv6110_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth) +{ + struct stv6110_priv *priv = fe->tuner_priv; + u8 r8 = 0; + u8 regs[] = { 0, 0, 0, 0, 0, 0, 0, 0 }; + stv6110_read_regs(fe, regs, 0, 8); + + /* CF */ + r8 = priv->regs[RSTV6110_CTRL3] & 0x1f; + *bandwidth = (r8 + 5) * 2000000;/* x2 for ZIF tuner BW/2 = F+5 Mhz */ + + return 0; +} + +static const struct dvb_tuner_ops stv6110_tuner_ops = { + .info = { + .name = "ST STV6110", + .frequency_min_hz = 950 * MHz, + .frequency_max_hz = 2150 * MHz, + .frequency_step_hz = 1 * MHz, + }, + .init = stv6110_init, + .release = stv6110_release, + .sleep = stv6110_sleep, + .set_params = stv6110_set_params, + .get_frequency = stv6110_get_frequency, + .set_frequency = stv6110_set_frequency, + .get_bandwidth = stv6110_get_bandwidth, + .set_bandwidth = stv6110_set_bandwidth, + +}; + +struct dvb_frontend *stv6110_attach(struct dvb_frontend *fe, + const struct stv6110_config *config, + struct i2c_adapter *i2c) +{ + struct stv6110_priv *priv = NULL; + u8 reg0[] = { 0x00, 0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e }; + + struct i2c_msg msg[] = { + { + .addr = config->i2c_address, + .flags = 0, + .buf = reg0, + .len = 9 + } + }; + int ret; + + /* divisor value for the output clock */ + reg0[2] &= ~0xc0; + reg0[2] |= (config->clk_div << 6); + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + + ret = i2c_transfer(i2c, msg, 1); + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 0); + + if (ret != 1) + return NULL; + + priv = kzalloc(sizeof(struct stv6110_priv), GFP_KERNEL); + if (priv == NULL) + return NULL; + + priv->i2c_address = config->i2c_address; + priv->i2c = i2c; + priv->mclk = config->mclk; + priv->clk_div = config->clk_div; + priv->gain = config->gain; + + memcpy(&priv->regs, ®0[1], 8); + + memcpy(&fe->ops.tuner_ops, &stv6110_tuner_ops, + sizeof(struct dvb_tuner_ops)); + fe->tuner_priv = priv; + printk(KERN_INFO "STV6110 attached on addr=%x!\n", priv->i2c_address); + + return fe; +} +EXPORT_SYMBOL_GPL(stv6110_attach); + +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); + +MODULE_DESCRIPTION("ST STV6110 driver"); +MODULE_AUTHOR("Igor M. Liplianin"); +MODULE_LICENSE("GPL"); |