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 000000000000..ba84936aafd6
--- /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,
+                         &quotient, &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");