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path: root/drivers/media/tuners/max2165.c
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Diffstat (limited to 'drivers/media/tuners/max2165.c')
-rw-r--r--drivers/media/tuners/max2165.c417
1 files changed, 417 insertions, 0 deletions
diff --git a/drivers/media/tuners/max2165.c b/drivers/media/tuners/max2165.c
new file mode 100644
index 000000000..1575ab94e
--- /dev/null
+++ b/drivers/media/tuners/max2165.c
@@ -0,0 +1,417 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Maxim MAX2165 silicon tuner
+ *
+ * Copyright (c) 2009 David T. L. Wong <davidtlwong@gmail.com>
+ */
+
+#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 <media/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;
+}
+
+static 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 void max2165_release(struct dvb_frontend *fe)
+{
+ struct max2165_priv *priv = fe->tuner_priv;
+ dprintk("%s()\n", __func__);
+
+ kfree(priv);
+ fe->tuner_priv = NULL;
+}
+
+static const struct dvb_tuner_ops max2165_tuner_ops = {
+ .info = {
+ .name = "Maxim MAX2165",
+ .frequency_min_hz = 470 * MHz,
+ .frequency_max_hz = 862 * MHz,
+ .frequency_step_hz = 50 * kHz,
+ },
+
+ .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_GPL(max2165_attach);
+
+MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");
+MODULE_DESCRIPTION("Maxim MAX2165 silicon tuner driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 12:42:15 +0000