/* * 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 -1; 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; /* Set PLL divider according to RF frequency */ fixpt_div32(freq / 1000, priv->config->osc_clk * 1000, "ient, &fraction); /* 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");