diff options
Diffstat (limited to 'drivers/media/dvb/frontends/mt2266.c')
| -rw-r--r-- | drivers/media/dvb/frontends/mt2266.c | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/drivers/media/dvb/frontends/mt2266.c b/drivers/media/dvb/frontends/mt2266.c new file mode 100644 index 000000000000..03fe8265745f --- /dev/null +++ b/drivers/media/dvb/frontends/mt2266.c @@ -0,0 +1,287 @@ +/* + * Driver for Microtune MT2266 "Direct conversion low power broadband tuner" + * + * Copyright (c) 2007 Olivier DANET <odanet@caramail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/dvb/frontend.h> +#include <linux/i2c.h> + +#include "dvb_frontend.h" +#include "mt2266.h" + +#define I2C_ADDRESS 0x60 + +#define REG_PART_REV 0 +#define REG_TUNE 1 +#define REG_BAND 6 +#define REG_BANDWIDTH 8 +#define REG_LOCK 0x12 + +#define PART_REV 0x85 + +struct mt2266_priv { + struct mt2266_config *cfg; + struct i2c_adapter *i2c; + + u32 frequency; + u32 bandwidth; +}; + +/* Here, frequencies are expressed in kiloHertz to avoid 32 bits overflows */ + +static int debug; +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off)."); + +#define dprintk(args...) do { if (debug) {printk(KERN_DEBUG "MT2266: " args); printk("\n"); }} while (0) + +// Reads a single register +static int mt2266_readreg(struct mt2266_priv *priv, u8 reg, u8 *val) +{ + struct i2c_msg msg[2] = { + { .addr = priv->cfg->i2c_address, .flags = 0, .buf = ®, .len = 1 }, + { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, .buf = val, .len = 1 }, + }; + if (i2c_transfer(priv->i2c, msg, 2) != 2) { + printk(KERN_WARNING "MT2266 I2C read failed\n"); + return -EREMOTEIO; + } + return 0; +} + +// Writes a single register +static int mt2266_writereg(struct mt2266_priv *priv, u8 reg, u8 val) +{ + u8 buf[2] = { reg, val }; + struct i2c_msg msg = { + .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 2 + }; + if (i2c_transfer(priv->i2c, &msg, 1) != 1) { + printk(KERN_WARNING "MT2266 I2C write failed\n"); + return -EREMOTEIO; + } + return 0; +} + +// Writes a set of consecutive registers +static int mt2266_writeregs(struct mt2266_priv *priv,u8 *buf, u8 len) +{ + struct i2c_msg msg = { + .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = len + }; + if (i2c_transfer(priv->i2c, &msg, 1) != 1) { + printk(KERN_WARNING "MT2266 I2C write failed (len=%i)\n",(int)len); + return -EREMOTEIO; + } + return 0; +} + +// Initialisation sequences +static u8 mt2266_init1[] = { + REG_TUNE, + 0x00, 0x00, 0x28, 0x00, 0x52, 0x99, 0x3f }; + +static u8 mt2266_init2[] = { + 0x17, 0x6d, 0x71, 0x61, 0xc0, 0xbf, 0xff, 0xdc, 0x00, 0x0a, + 0xd4, 0x03, 0x64, 0x64, 0x64, 0x64, 0x22, 0xaa, 0xf2, 0x1e, 0x80, 0x14, 0x01, 0x01, 0x01, 0x01, + 0x01, 0x01, 0x7f, 0x5e, 0x3f, 0xff, 0xff, 0xff, 0x00, 0x77, 0x0f, 0x2d }; + +static u8 mt2266_init_8mhz[] = { + REG_BANDWIDTH, + 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22 }; + +static u8 mt2266_init_7mhz[] = { + REG_BANDWIDTH, + 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32 }; + +static u8 mt2266_init_6mhz[] = { + REG_BANDWIDTH, + 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7, 0xa7 }; + +#define FREF 30000 // Quartz oscillator 30 MHz + +static int mt2266_set_params(struct dvb_frontend *fe, struct dvb_frontend_parameters *params) +{ + struct mt2266_priv *priv; + int ret=0; + u32 freq; + u32 tune; + u8 lnaband; + u8 b[10]; + int i; + + priv = fe->tuner_priv; + + mt2266_writereg(priv,0x17,0x6d); + mt2266_writereg(priv,0x1c,0xff); + + freq = params->frequency / 1000; // Hz -> kHz + priv->bandwidth = (fe->ops.info.type == FE_OFDM) ? params->u.ofdm.bandwidth : 0; + priv->frequency = freq * 1000; + tune=2 * freq * (8192/16) / (FREF/16); + + if (freq <= 495000) lnaband = 0xEE; else + if (freq <= 525000) lnaband = 0xDD; else + if (freq <= 550000) lnaband = 0xCC; else + if (freq <= 580000) lnaband = 0xBB; else + if (freq <= 605000) lnaband = 0xAA; else + if (freq <= 630000) lnaband = 0x99; else + if (freq <= 655000) lnaband = 0x88; else + if (freq <= 685000) lnaband = 0x77; else + if (freq <= 710000) lnaband = 0x66; else + if (freq <= 735000) lnaband = 0x55; else + if (freq <= 765000) lnaband = 0x44; else + if (freq <= 802000) lnaband = 0x33; else + if (freq <= 840000) lnaband = 0x22; else lnaband = 0x11; + + msleep(100); + mt2266_writeregs(priv,(params->u.ofdm.bandwidth==BANDWIDTH_6_MHZ)?mt2266_init_6mhz: + (params->u.ofdm.bandwidth==BANDWIDTH_7_MHZ)?mt2266_init_7mhz: + mt2266_init_8mhz,sizeof(mt2266_init_8mhz)); + + b[0] = REG_TUNE; + b[1] = (tune >> 8) & 0x1F; + b[2] = tune & 0xFF; + b[3] = tune >> 13; + mt2266_writeregs(priv,b,4); + + dprintk("set_parms: tune=%d band=%d",(int)tune,(int)lnaband); + dprintk("set_parms: [1..3]: %2x %2x %2x",(int)b[1],(int)b[2],(int)b[3]); + + b[0] = 0x05; + b[1] = 0x62; + b[2] = lnaband; + mt2266_writeregs(priv,b,3); + + //Waits for pll lock or timeout + i = 0; + do { + mt2266_readreg(priv,REG_LOCK,b); + if ((b[0] & 0x40)==0x40) + break; + msleep(10); + i++; + } while (i<10); + dprintk("Lock when i=%i",(int)i); + return ret; +} + +static void mt2266_calibrate(struct mt2266_priv *priv) +{ + mt2266_writereg(priv,0x11,0x03); + mt2266_writereg(priv,0x11,0x01); + + mt2266_writeregs(priv,mt2266_init1,sizeof(mt2266_init1)); + mt2266_writeregs(priv,mt2266_init2,sizeof(mt2266_init2)); + + mt2266_writereg(priv,0x33,0x5e); + mt2266_writereg(priv,0x10,0x10); + mt2266_writereg(priv,0x10,0x00); + + mt2266_writeregs(priv,mt2266_init_8mhz,sizeof(mt2266_init_8mhz)); + + msleep(25); + mt2266_writereg(priv,0x17,0x6d); + mt2266_writereg(priv,0x1c,0x00); + msleep(75); + mt2266_writereg(priv,0x17,0x6d); + mt2266_writereg(priv,0x1c,0xff); +} + +static int mt2266_get_frequency(struct dvb_frontend *fe, u32 *frequency) +{ + struct mt2266_priv *priv = fe->tuner_priv; + *frequency = priv->frequency; + return 0; +} + +static int mt2266_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth) +{ + struct mt2266_priv *priv = fe->tuner_priv; + *bandwidth = priv->bandwidth; + return 0; +} + +static int mt2266_init(struct dvb_frontend *fe) +{ + struct mt2266_priv *priv = fe->tuner_priv; + mt2266_writereg(priv,0x17,0x6d); + mt2266_writereg(priv,0x1c,0xff); + return 0; +} + +static int mt2266_sleep(struct dvb_frontend *fe) +{ + struct mt2266_priv *priv = fe->tuner_priv; + mt2266_writereg(priv,0x17,0x6d); + mt2266_writereg(priv,0x1c,0x00); + return 0; +} + +static int mt2266_release(struct dvb_frontend *fe) +{ + kfree(fe->tuner_priv); + fe->tuner_priv = NULL; + return 0; +} + +static const struct dvb_tuner_ops mt2266_tuner_ops = { + .info = { + .name = "Microtune MT2266", + .frequency_min = 470000000, + .frequency_max = 860000000, + .frequency_step = 50000, + }, + .release = mt2266_release, + .init = mt2266_init, + .sleep = mt2266_sleep, + .set_params = mt2266_set_params, + .get_frequency = mt2266_get_frequency, + .get_bandwidth = mt2266_get_bandwidth +}; + +struct dvb_frontend * mt2266_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, struct mt2266_config *cfg) +{ + struct mt2266_priv *priv = NULL; + u8 id = 0; + + priv = kzalloc(sizeof(struct mt2266_priv), GFP_KERNEL); + if (priv == NULL) + return NULL; + + priv->cfg = cfg; + priv->i2c = i2c; + + if (mt2266_readreg(priv,0,&id) != 0) { + kfree(priv); + return NULL; + } + if (id != PART_REV) { + kfree(priv); + return NULL; + } + printk(KERN_INFO "MT2266: successfully identified\n"); + memcpy(&fe->ops.tuner_ops, &mt2266_tuner_ops, sizeof(struct dvb_tuner_ops)); + + fe->tuner_priv = priv; + mt2266_calibrate(priv); + return fe; +} +EXPORT_SYMBOL(mt2266_attach); + +MODULE_AUTHOR("Olivier DANET"); +MODULE_DESCRIPTION("Microtune MT2266 silicon tuner driver"); +MODULE_LICENSE("GPL"); |