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path: root/drivers/media/tuners/mc44s803.c
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Diffstat (limited to 'drivers/media/tuners/mc44s803.c')
-rw-r--r--drivers/media/tuners/mc44s803.c379
1 files changed, 379 insertions, 0 deletions
diff --git a/drivers/media/tuners/mc44s803.c b/drivers/media/tuners/mc44s803.c
new file mode 100644
index 0000000..f1b7640
--- /dev/null
+++ b/drivers/media/tuners/mc44s803.c
@@ -0,0 +1,379 @@
+/*
+ * Driver for Freescale MC44S803 Low Power CMOS Broadband Tuner
+ *
+ * Copyright (c) 2009 Jochen Friedrich <jochen@scram.de>
+ *
+ * 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/delay.h>
+#include <linux/dvb/frontend.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+
+#include "dvb_frontend.h"
+
+#include "mc44s803.h"
+#include "mc44s803_priv.h"
+
+#define mc_printk(level, format, arg...) \
+ printk(level "mc44s803: " format , ## arg)
+
+/* Writes a single register */
+static int mc44s803_writereg(struct mc44s803_priv *priv, u32 val)
+{
+ u8 buf[3];
+ struct i2c_msg msg = {
+ .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 3
+ };
+
+ buf[0] = (val & 0xff0000) >> 16;
+ buf[1] = (val & 0xff00) >> 8;
+ buf[2] = (val & 0xff);
+
+ if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
+ mc_printk(KERN_WARNING, "I2C write failed\n");
+ return -EREMOTEIO;
+ }
+ return 0;
+}
+
+/* Reads a single register */
+static int mc44s803_readreg(struct mc44s803_priv *priv, u8 reg, u32 *val)
+{
+ u32 wval;
+ u8 buf[3];
+ int ret;
+ struct i2c_msg msg[] = {
+ { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD,
+ .buf = buf, .len = 3 },
+ };
+
+ wval = MC44S803_REG_SM(MC44S803_REG_DATAREG, MC44S803_ADDR) |
+ MC44S803_REG_SM(reg, MC44S803_D);
+
+ ret = mc44s803_writereg(priv, wval);
+ if (ret)
+ return ret;
+
+ if (i2c_transfer(priv->i2c, msg, 1) != 1) {
+ mc_printk(KERN_WARNING, "I2C read failed\n");
+ return -EREMOTEIO;
+ }
+
+ *val = (buf[0] << 16) | (buf[1] << 8) | buf[2];
+
+ return 0;
+}
+
+static int mc44s803_release(struct dvb_frontend *fe)
+{
+ struct mc44s803_priv *priv = fe->tuner_priv;
+
+ fe->tuner_priv = NULL;
+ kfree(priv);
+
+ return 0;
+}
+
+static int mc44s803_init(struct dvb_frontend *fe)
+{
+ struct mc44s803_priv *priv = fe->tuner_priv;
+ u32 val;
+ int err;
+
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 1);
+
+/* Reset chip */
+ val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR) |
+ MC44S803_REG_SM(1, MC44S803_RS);
+
+ err = mc44s803_writereg(priv, val);
+ if (err)
+ goto exit;
+
+ val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR);
+
+ err = mc44s803_writereg(priv, val);
+ if (err)
+ goto exit;
+
+/* Power Up and Start Osc */
+
+ val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) |
+ MC44S803_REG_SM(0xC0, MC44S803_REFOSC) |
+ MC44S803_REG_SM(1, MC44S803_OSCSEL);
+
+ err = mc44s803_writereg(priv, val);
+ if (err)
+ goto exit;
+
+ val = MC44S803_REG_SM(MC44S803_REG_POWER, MC44S803_ADDR) |
+ MC44S803_REG_SM(0x200, MC44S803_POWER);
+
+ err = mc44s803_writereg(priv, val);
+ if (err)
+ goto exit;
+
+ msleep(10);
+
+ val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) |
+ MC44S803_REG_SM(0x40, MC44S803_REFOSC) |
+ MC44S803_REG_SM(1, MC44S803_OSCSEL);
+
+ err = mc44s803_writereg(priv, val);
+ if (err)
+ goto exit;
+
+ msleep(20);
+
+/* Setup Mixer */
+
+ val = MC44S803_REG_SM(MC44S803_REG_MIXER, MC44S803_ADDR) |
+ MC44S803_REG_SM(1, MC44S803_TRI_STATE) |
+ MC44S803_REG_SM(0x7F, MC44S803_MIXER_RES);
+
+ err = mc44s803_writereg(priv, val);
+ if (err)
+ goto exit;
+
+/* Setup Cirquit Adjust */
+
+ val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) |
+ MC44S803_REG_SM(1, MC44S803_G1) |
+ MC44S803_REG_SM(1, MC44S803_G3) |
+ MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) |
+ MC44S803_REG_SM(1, MC44S803_G6) |
+ MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) |
+ MC44S803_REG_SM(0x3, MC44S803_LP) |
+ MC44S803_REG_SM(1, MC44S803_CLRF) |
+ MC44S803_REG_SM(1, MC44S803_CLIF);
+
+ err = mc44s803_writereg(priv, val);
+ if (err)
+ goto exit;
+
+ val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) |
+ MC44S803_REG_SM(1, MC44S803_G1) |
+ MC44S803_REG_SM(1, MC44S803_G3) |
+ MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) |
+ MC44S803_REG_SM(1, MC44S803_G6) |
+ MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) |
+ MC44S803_REG_SM(0x3, MC44S803_LP);
+
+ err = mc44s803_writereg(priv, val);
+ if (err)
+ goto exit;
+
+/* Setup Digtune */
+
+ val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
+ MC44S803_REG_SM(3, MC44S803_XOD);
+
+ err = mc44s803_writereg(priv, val);
+ if (err)
+ goto exit;
+
+/* Setup AGC */
+
+ val = MC44S803_REG_SM(MC44S803_REG_LNAAGC, MC44S803_ADDR) |
+ MC44S803_REG_SM(1, MC44S803_AT1) |
+ MC44S803_REG_SM(1, MC44S803_AT2) |
+ MC44S803_REG_SM(1, MC44S803_AGC_AN_DIG) |
+ MC44S803_REG_SM(1, MC44S803_AGC_READ_EN) |
+ MC44S803_REG_SM(1, MC44S803_LNA0);
+
+ err = mc44s803_writereg(priv, val);
+ if (err)
+ goto exit;
+
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0);
+ return 0;
+
+exit:
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0);
+
+ mc_printk(KERN_WARNING, "I/O Error\n");
+ return err;
+}
+
+static int mc44s803_set_params(struct dvb_frontend *fe)
+{
+ struct mc44s803_priv *priv = fe->tuner_priv;
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+ u32 r1, r2, n1, n2, lo1, lo2, freq, val;
+ int err;
+
+ priv->frequency = c->frequency;
+
+ r1 = MC44S803_OSC / 1000000;
+ r2 = MC44S803_OSC / 100000;
+
+ n1 = (c->frequency + MC44S803_IF1 + 500000) / 1000000;
+ freq = MC44S803_OSC / r1 * n1;
+ lo1 = ((60 * n1) + (r1 / 2)) / r1;
+ freq = freq - c->frequency;
+
+ n2 = (freq - MC44S803_IF2 + 50000) / 100000;
+ lo2 = ((60 * n2) + (r2 / 2)) / r2;
+
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 1);
+
+ val = MC44S803_REG_SM(MC44S803_REG_REFDIV, MC44S803_ADDR) |
+ MC44S803_REG_SM(r1-1, MC44S803_R1) |
+ MC44S803_REG_SM(r2-1, MC44S803_R2) |
+ MC44S803_REG_SM(1, MC44S803_REFBUF_EN);
+
+ err = mc44s803_writereg(priv, val);
+ if (err)
+ goto exit;
+
+ val = MC44S803_REG_SM(MC44S803_REG_LO1, MC44S803_ADDR) |
+ MC44S803_REG_SM(n1-2, MC44S803_LO1);
+
+ err = mc44s803_writereg(priv, val);
+ if (err)
+ goto exit;
+
+ val = MC44S803_REG_SM(MC44S803_REG_LO2, MC44S803_ADDR) |
+ MC44S803_REG_SM(n2-2, MC44S803_LO2);
+
+ err = mc44s803_writereg(priv, val);
+ if (err)
+ goto exit;
+
+ val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
+ MC44S803_REG_SM(1, MC44S803_DA) |
+ MC44S803_REG_SM(lo1, MC44S803_LO_REF) |
+ MC44S803_REG_SM(1, MC44S803_AT);
+
+ err = mc44s803_writereg(priv, val);
+ if (err)
+ goto exit;
+
+ val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
+ MC44S803_REG_SM(2, MC44S803_DA) |
+ MC44S803_REG_SM(lo2, MC44S803_LO_REF) |
+ MC44S803_REG_SM(1, MC44S803_AT);
+
+ err = mc44s803_writereg(priv, val);
+ if (err)
+ goto exit;
+
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0);
+
+ return 0;
+
+exit:
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0);
+
+ mc_printk(KERN_WARNING, "I/O Error\n");
+ return err;
+}
+
+static int mc44s803_get_frequency(struct dvb_frontend *fe, u32 *frequency)
+{
+ struct mc44s803_priv *priv = fe->tuner_priv;
+ *frequency = priv->frequency;
+ return 0;
+}
+
+static int mc44s803_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
+{
+ *frequency = MC44S803_IF2; /* 36.125 MHz */
+ return 0;
+}
+
+static const struct dvb_tuner_ops mc44s803_tuner_ops = {
+ .info = {
+ .name = "Freescale MC44S803",
+ .frequency_min = 48000000,
+ .frequency_max = 1000000000,
+ .frequency_step = 100000,
+ },
+
+ .release = mc44s803_release,
+ .init = mc44s803_init,
+ .set_params = mc44s803_set_params,
+ .get_frequency = mc44s803_get_frequency,
+ .get_if_frequency = mc44s803_get_if_frequency,
+};
+
+/* This functions tries to identify a MC44S803 tuner by reading the ID
+ register. This is hasty. */
+struct dvb_frontend *mc44s803_attach(struct dvb_frontend *fe,
+ struct i2c_adapter *i2c, struct mc44s803_config *cfg)
+{
+ struct mc44s803_priv *priv;
+ u32 reg;
+ u8 id;
+ int ret;
+
+ reg = 0;
+
+ priv = kzalloc(sizeof(struct mc44s803_priv), GFP_KERNEL);
+ if (priv == NULL)
+ return NULL;
+
+ priv->cfg = cfg;
+ priv->i2c = i2c;
+ priv->fe = fe;
+
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
+
+ ret = mc44s803_readreg(priv, MC44S803_REG_ID, &reg);
+ if (ret)
+ goto error;
+
+ id = MC44S803_REG_MS(reg, MC44S803_ID);
+
+ if (id != 0x14) {
+ mc_printk(KERN_ERR, "unsupported ID "
+ "(%x should be 0x14)\n", id);
+ goto error;
+ }
+
+ mc_printk(KERN_INFO, "successfully identified (ID = %x)\n", id);
+ memcpy(&fe->ops.tuner_ops, &mc44s803_tuner_ops,
+ sizeof(struct dvb_tuner_ops));
+
+ fe->tuner_priv = priv;
+
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
+
+ return fe;
+
+error:
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
+
+ kfree(priv);
+ return NULL;
+}
+EXPORT_SYMBOL(mc44s803_attach);
+
+MODULE_AUTHOR("Jochen Friedrich");
+MODULE_DESCRIPTION("Freescale MC44S803 silicon tuner driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-18 05:44:45 +0000