diff options
Diffstat (limited to 'drivers/media/tuners/max2165.c')
| -rw-r--r-- | drivers/media/tuners/max2165.c | 433 |
1 files changed, 433 insertions, 0 deletions
diff --git a/drivers/media/tuners/max2165.c b/drivers/media/tuners/max2165.c new file mode 100644 index 0000000..ba84936 --- /dev/null +++ b/drivers/media/tuners/max2165.c @@ -0,0 +1,433 @@ +/* + * Driver for Maxim MAX2165 silicon tuner + * + * Copyright (c) 2009 David T. L. Wong <davidtlwong@gmail.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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/videodev2.h> +#include <linux/delay.h> +#include <linux/dvb/frontend.h> +#include <linux/i2c.h> +#include <linux/slab.h> + +#include "dvb_frontend.h" + +#include "max2165.h" +#include "max2165_priv.h" +#include "tuner-i2c.h" + +#define dprintk(args...) \ + do { \ + if (debug) \ + printk(KERN_DEBUG "max2165: " args); \ + } while (0) + +static int debug; +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off)."); + +static int max2165_write_reg(struct max2165_priv *priv, u8 reg, u8 data) +{ + int ret; + u8 buf[] = { reg, data }; + struct i2c_msg msg = { .flags = 0, .buf = buf, .len = 2 }; + + msg.addr = priv->config->i2c_address; + + if (debug >= 2) + dprintk("%s: reg=0x%02X, data=0x%02X\n", __func__, reg, data); + + ret = i2c_transfer(priv->i2c, &msg, 1); + + if (ret != 1) + dprintk("%s: error reg=0x%x, data=0x%x, ret=%i\n", + __func__, reg, data, ret); + + return (ret != 1) ? -EIO : 0; +} + +static int max2165_read_reg(struct max2165_priv *priv, u8 reg, u8 *p_data) +{ + int ret; + u8 dev_addr = priv->config->i2c_address; + + u8 b0[] = { reg }; + u8 b1[] = { 0 }; + struct i2c_msg msg[] = { + { .addr = dev_addr, .flags = 0, .buf = b0, .len = 1 }, + { .addr = dev_addr, .flags = I2C_M_RD, .buf = b1, .len = 1 }, + }; + + ret = i2c_transfer(priv->i2c, msg, 2); + if (ret != 2) { + dprintk("%s: error reg=0x%x, ret=%i\n", __func__, reg, ret); + return -EIO; + } + + *p_data = b1[0]; + if (debug >= 2) + dprintk("%s: reg=0x%02X, data=0x%02X\n", + __func__, reg, b1[0]); + return 0; +} + +static int max2165_mask_write_reg(struct max2165_priv *priv, u8 reg, + u8 mask, u8 data) +{ + int ret; + u8 v; + + data &= mask; + ret = max2165_read_reg(priv, reg, &v); + if (ret != 0) + return ret; + v &= ~mask; + v |= data; + ret = max2165_write_reg(priv, reg, v); + + return ret; +} + +static int max2165_read_rom_table(struct max2165_priv *priv) +{ + u8 dat[3]; + int i; + + for (i = 0; i < 3; i++) { + max2165_write_reg(priv, REG_ROM_TABLE_ADDR, i + 1); + max2165_read_reg(priv, REG_ROM_TABLE_DATA, &dat[i]); + } + + priv->tf_ntch_low_cfg = dat[0] >> 4; + priv->tf_ntch_hi_cfg = dat[0] & 0x0F; + priv->tf_balun_low_ref = dat[1] & 0x0F; + priv->tf_balun_hi_ref = dat[1] >> 4; + priv->bb_filter_7mhz_cfg = dat[2] & 0x0F; + priv->bb_filter_8mhz_cfg = dat[2] >> 4; + + dprintk("tf_ntch_low_cfg = 0x%X\n", priv->tf_ntch_low_cfg); + dprintk("tf_ntch_hi_cfg = 0x%X\n", priv->tf_ntch_hi_cfg); + dprintk("tf_balun_low_ref = 0x%X\n", priv->tf_balun_low_ref); + dprintk("tf_balun_hi_ref = 0x%X\n", priv->tf_balun_hi_ref); + dprintk("bb_filter_7mhz_cfg = 0x%X\n", priv->bb_filter_7mhz_cfg); + dprintk("bb_filter_8mhz_cfg = 0x%X\n", priv->bb_filter_8mhz_cfg); + + return 0; +} + +static int max2165_set_osc(struct max2165_priv *priv, u8 osc /*MHz*/) +{ + u8 v; + + v = (osc / 2); + if (v == 2) + v = 0x7; + else + v -= 8; + + max2165_mask_write_reg(priv, REG_PLL_CFG, 0x07, v); + + return 0; +} + +static int max2165_set_bandwidth(struct max2165_priv *priv, u32 bw) +{ + u8 val; + + if (bw == 8000000) + val = priv->bb_filter_8mhz_cfg; + else + val = priv->bb_filter_7mhz_cfg; + + max2165_mask_write_reg(priv, REG_BASEBAND_CTRL, 0xF0, val << 4); + + return 0; +} + +int fixpt_div32(u32 dividend, u32 divisor, u32 *quotient, u32 *fraction) +{ + u32 remainder; + u32 q, f = 0; + int i; + + if (0 == divisor) + return -EINVAL; + + q = dividend / divisor; + remainder = dividend - q * divisor; + + for (i = 0; i < 31; i++) { + remainder <<= 1; + if (remainder >= divisor) { + f += 1; + remainder -= divisor; + } + f <<= 1; + } + + *quotient = q; + *fraction = f; + + return 0; +} + +static int max2165_set_rf(struct max2165_priv *priv, u32 freq) +{ + u8 tf; + u8 tf_ntch; + u32 t; + u32 quotient, fraction; + int ret; + + /* Set PLL divider according to RF frequency */ + ret = fixpt_div32(freq / 1000, priv->config->osc_clk * 1000, + "ient, &fraction); + if (ret != 0) + return ret; + + /* 20-bit fraction */ + fraction >>= 12; + + max2165_write_reg(priv, REG_NDIV_INT, quotient); + max2165_mask_write_reg(priv, REG_NDIV_FRAC2, 0x0F, fraction >> 16); + max2165_write_reg(priv, REG_NDIV_FRAC1, fraction >> 8); + max2165_write_reg(priv, REG_NDIV_FRAC0, fraction); + + /* Norch Filter */ + tf_ntch = (freq < 725000000) ? + priv->tf_ntch_low_cfg : priv->tf_ntch_hi_cfg; + + /* Tracking filter balun */ + t = priv->tf_balun_low_ref; + t += (priv->tf_balun_hi_ref - priv->tf_balun_low_ref) + * (freq / 1000 - 470000) / (780000 - 470000); + + tf = t; + dprintk("tf = %X\n", tf); + tf |= tf_ntch << 4; + + max2165_write_reg(priv, REG_TRACK_FILTER, tf); + + return 0; +} + +static void max2165_debug_status(struct max2165_priv *priv) +{ + u8 status, autotune; + u8 auto_vco_success, auto_vco_active; + u8 pll_locked; + u8 dc_offset_low, dc_offset_hi; + u8 signal_lv_over_threshold; + u8 vco, vco_sub_band, adc; + + max2165_read_reg(priv, REG_STATUS, &status); + max2165_read_reg(priv, REG_AUTOTUNE, &autotune); + + auto_vco_success = (status >> 6) & 0x01; + auto_vco_active = (status >> 5) & 0x01; + pll_locked = (status >> 4) & 0x01; + dc_offset_low = (status >> 3) & 0x01; + dc_offset_hi = (status >> 2) & 0x01; + signal_lv_over_threshold = status & 0x01; + + vco = autotune >> 6; + vco_sub_band = (autotune >> 3) & 0x7; + adc = autotune & 0x7; + + dprintk("auto VCO active: %d, auto VCO success: %d\n", + auto_vco_active, auto_vco_success); + dprintk("PLL locked: %d\n", pll_locked); + dprintk("DC offset low: %d, DC offset high: %d\n", + dc_offset_low, dc_offset_hi); + dprintk("Signal lvl over threshold: %d\n", signal_lv_over_threshold); + dprintk("VCO: %d, VCO Sub-band: %d, ADC: %d\n", vco, vco_sub_band, adc); +} + +static int max2165_set_params(struct dvb_frontend *fe) +{ + struct max2165_priv *priv = fe->tuner_priv; + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + int ret; + + switch (c->bandwidth_hz) { + case 7000000: + case 8000000: + priv->frequency = c->frequency; + break; + default: + printk(KERN_INFO "MAX2165: bandwidth %d Hz not supported.\n", + c->bandwidth_hz); + return -EINVAL; + } + + dprintk("%s() frequency=%d\n", __func__, c->frequency); + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + max2165_set_bandwidth(priv, c->bandwidth_hz); + ret = max2165_set_rf(priv, priv->frequency); + mdelay(50); + max2165_debug_status(priv); + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 0); + + if (ret != 0) + return -EREMOTEIO; + + return 0; +} + +static int max2165_get_frequency(struct dvb_frontend *fe, u32 *freq) +{ + struct max2165_priv *priv = fe->tuner_priv; + dprintk("%s()\n", __func__); + *freq = priv->frequency; + return 0; +} + +static int max2165_get_bandwidth(struct dvb_frontend *fe, u32 *bw) +{ + struct max2165_priv *priv = fe->tuner_priv; + dprintk("%s()\n", __func__); + + *bw = priv->bandwidth; + return 0; +} + +static int max2165_get_status(struct dvb_frontend *fe, u32 *status) +{ + struct max2165_priv *priv = fe->tuner_priv; + u16 lock_status = 0; + + dprintk("%s()\n", __func__); + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + + max2165_debug_status(priv); + *status = lock_status; + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 0); + + return 0; +} + +static int max2165_sleep(struct dvb_frontend *fe) +{ + dprintk("%s()\n", __func__); + return 0; +} + +static int max2165_init(struct dvb_frontend *fe) +{ + struct max2165_priv *priv = fe->tuner_priv; + dprintk("%s()\n", __func__); + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + + /* Setup initial values */ + /* Fractional Mode on */ + max2165_write_reg(priv, REG_NDIV_FRAC2, 0x18); + /* LNA on */ + max2165_write_reg(priv, REG_LNA, 0x01); + max2165_write_reg(priv, REG_PLL_CFG, 0x7A); + max2165_write_reg(priv, REG_TEST, 0x08); + max2165_write_reg(priv, REG_SHUTDOWN, 0x40); + max2165_write_reg(priv, REG_VCO_CTRL, 0x84); + max2165_write_reg(priv, REG_BASEBAND_CTRL, 0xC3); + max2165_write_reg(priv, REG_DC_OFFSET_CTRL, 0x75); + max2165_write_reg(priv, REG_DC_OFFSET_DAC, 0x00); + max2165_write_reg(priv, REG_ROM_TABLE_ADDR, 0x00); + + max2165_set_osc(priv, priv->config->osc_clk); + + max2165_read_rom_table(priv); + + max2165_set_bandwidth(priv, 8000000); + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 0); + + return 0; +} + +static int max2165_release(struct dvb_frontend *fe) +{ + struct max2165_priv *priv = fe->tuner_priv; + dprintk("%s()\n", __func__); + + kfree(priv); + fe->tuner_priv = NULL; + + return 0; +} + +static const struct dvb_tuner_ops max2165_tuner_ops = { + .info = { + .name = "Maxim MAX2165", + .frequency_min = 470000000, + .frequency_max = 780000000, + .frequency_step = 50000, + }, + + .release = max2165_release, + .init = max2165_init, + .sleep = max2165_sleep, + + .set_params = max2165_set_params, + .set_analog_params = NULL, + .get_frequency = max2165_get_frequency, + .get_bandwidth = max2165_get_bandwidth, + .get_status = max2165_get_status +}; + +struct dvb_frontend *max2165_attach(struct dvb_frontend *fe, + struct i2c_adapter *i2c, + struct max2165_config *cfg) +{ + struct max2165_priv *priv = NULL; + + dprintk("%s(%d-%04x)\n", __func__, + i2c ? i2c_adapter_id(i2c) : -1, + cfg ? cfg->i2c_address : -1); + + priv = kzalloc(sizeof(struct max2165_priv), GFP_KERNEL); + if (priv == NULL) + return NULL; + + memcpy(&fe->ops.tuner_ops, &max2165_tuner_ops, + sizeof(struct dvb_tuner_ops)); + + priv->config = cfg; + priv->i2c = i2c; + fe->tuner_priv = priv; + + max2165_init(fe); + max2165_debug_status(priv); + + return fe; +} +EXPORT_SYMBOL(max2165_attach); + +MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>"); +MODULE_DESCRIPTION("Maxim MAX2165 silicon tuner driver"); +MODULE_LICENSE("GPL"); |
