summaryrefslogtreecommitdiffstats
path: root/drivers/media/tuners/mt2266.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/media/tuners/mt2266.c')
-rw-r--r--drivers/media/tuners/mt2266.c343
1 files changed, 343 insertions, 0 deletions
diff --git a/drivers/media/tuners/mt2266.c b/drivers/media/tuners/mt2266.c
new file mode 100644
index 0000000000..2e92885a6b
--- /dev/null
+++ b/drivers/media/tuners/mt2266.c
@@ -0,0 +1,343 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Microtune MT2266 "Direct conversion low power broadband tuner"
+ *
+ * Copyright (c) 2007 Olivier DANET <odanet@caramail.com>
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/dvb/frontend.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+
+#include <media/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;
+ u8 band;
+};
+
+#define MT2266_VHF 1
+#define MT2266_UHF 0
+
+/* 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 = &reg, .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 };
+
+static u8 mt2266_uhf[] = { 0x1d, 0xdc, 0x00, 0x0a, 0xd4, 0x03, 0x64, 0x64,
+ 0x64, 0x64, 0x22, 0xaa, 0xf2, 0x1e, 0x80, 0x14 };
+
+static u8 mt2266_vhf[] = { 0x1d, 0xfe, 0x00, 0x00, 0xb4, 0x03, 0xa5, 0xa5,
+ 0xa5, 0xa5, 0x82, 0xaa, 0xf1, 0x17, 0x80, 0x1f };
+
+#define FREF 30000 // Quartz oscillator 30 MHz
+
+static int mt2266_set_params(struct dvb_frontend *fe)
+{
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+ struct mt2266_priv *priv;
+ int ret=0;
+ u32 freq;
+ u32 tune;
+ u8 lnaband;
+ u8 b[10];
+ int i;
+ u8 band;
+
+ priv = fe->tuner_priv;
+
+ freq = priv->frequency / 1000; /* Hz -> kHz */
+ if (freq < 470000 && freq > 230000)
+ return -EINVAL; /* Gap between VHF and UHF bands */
+
+ priv->frequency = c->frequency;
+ tune = 2 * freq * (8192/16) / (FREF/16);
+ band = (freq < 300000) ? MT2266_VHF : MT2266_UHF;
+ if (band == MT2266_VHF)
+ tune *= 2;
+
+ switch (c->bandwidth_hz) {
+ case 6000000:
+ mt2266_writeregs(priv, mt2266_init_6mhz,
+ sizeof(mt2266_init_6mhz));
+ break;
+ case 8000000:
+ mt2266_writeregs(priv, mt2266_init_8mhz,
+ sizeof(mt2266_init_8mhz));
+ break;
+ case 7000000:
+ default:
+ mt2266_writeregs(priv, mt2266_init_7mhz,
+ sizeof(mt2266_init_7mhz));
+ break;
+ }
+ priv->bandwidth = c->bandwidth_hz;
+
+ if (band == MT2266_VHF && priv->band == MT2266_UHF) {
+ dprintk("Switch from UHF to VHF");
+ mt2266_writereg(priv, 0x05, 0x04);
+ mt2266_writereg(priv, 0x19, 0x61);
+ mt2266_writeregs(priv, mt2266_vhf, sizeof(mt2266_vhf));
+ } else if (band == MT2266_UHF && priv->band == MT2266_VHF) {
+ dprintk("Switch from VHF to UHF");
+ mt2266_writereg(priv, 0x05, 0x52);
+ mt2266_writereg(priv, 0x19, 0x61);
+ mt2266_writeregs(priv, mt2266_uhf, sizeof(mt2266_uhf));
+ }
+ msleep(10);
+
+ 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;
+
+ 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 %s",
+ (int) tune, (int) lnaband,
+ (band == MT2266_UHF) ? "UHF" : "VHF");
+ dprintk("set_parms: [1..3]: %2x %2x %2x",
+ (int) b[1], (int) b[2], (int)b[3]);
+
+ if (band == MT2266_UHF) {
+ b[0] = 0x05;
+ b[1] = (priv->band == MT2266_VHF) ? 0x52 : 0x62;
+ b[2] = lnaband;
+ mt2266_writeregs(priv, b, 3);
+ }
+
+ /* Wait for pll lock or timeout */
+ i = 0;
+ do {
+ mt2266_readreg(priv,REG_LOCK,b);
+ if (b[0] & 0x40)
+ break;
+ msleep(10);
+ i++;
+ } while (i<10);
+ dprintk("Lock when i=%i",(int)i);
+
+ if (band == MT2266_UHF && priv->band == MT2266_VHF)
+ mt2266_writereg(priv, 0x05, 0x62);
+
+ priv->band = band;
+
+ 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)
+{
+ int ret;
+ struct mt2266_priv *priv = fe->tuner_priv;
+ ret = mt2266_writereg(priv, 0x17, 0x6d);
+ if (ret < 0)
+ return ret;
+ ret = mt2266_writereg(priv, 0x1c, 0xff);
+ if (ret < 0)
+ return ret;
+ 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 void mt2266_release(struct dvb_frontend *fe)
+{
+ kfree(fe->tuner_priv);
+ fe->tuner_priv = NULL;
+}
+
+static const struct dvb_tuner_ops mt2266_tuner_ops = {
+ .info = {
+ .name = "Microtune MT2266",
+ .frequency_min_hz = 174 * MHz,
+ .frequency_max_hz = 862 * MHz,
+ .frequency_step_hz = 50 * kHz,
+ },
+ .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;
+ priv->band = MT2266_UHF;
+
+ if (mt2266_readreg(priv, 0, &id)) {
+ 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_GPL(mt2266_attach);
+
+MODULE_AUTHOR("Olivier DANET");
+MODULE_DESCRIPTION("Microtune MT2266 silicon tuner driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-03 10:15:45 +0000