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path: root/drivers/media/tuners/tda18218.c
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Diffstat (limited to 'drivers/media/tuners/tda18218.c')
-rw-r--r--drivers/media/tuners/tda18218.c340
1 files changed, 340 insertions, 0 deletions
diff --git a/drivers/media/tuners/tda18218.c b/drivers/media/tuners/tda18218.c
new file mode 100644
index 00000000000..18198537be9
--- /dev/null
+++ b/drivers/media/tuners/tda18218.c
@@ -0,0 +1,340 @@
+/*
+ * NXP TDA18218HN silicon tuner driver
+ *
+ * Copyright (C) 2010 Antti Palosaari <crope@iki.fi>
+ *
+ * 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 "tda18218_priv.h"
+
+/* write multiple registers */
+static int tda18218_wr_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len)
+{
+ int ret = 0, len2, remaining;
+ u8 buf[1 + len];
+ struct i2c_msg msg[1] = {
+ {
+ .addr = priv->cfg->i2c_address,
+ .flags = 0,
+ .buf = buf,
+ }
+ };
+
+ for (remaining = len; remaining > 0;
+ remaining -= (priv->cfg->i2c_wr_max - 1)) {
+ len2 = remaining;
+ if (len2 > (priv->cfg->i2c_wr_max - 1))
+ len2 = (priv->cfg->i2c_wr_max - 1);
+
+ msg[0].len = 1 + len2;
+ buf[0] = reg + len - remaining;
+ memcpy(&buf[1], &val[len - remaining], len2);
+
+ ret = i2c_transfer(priv->i2c, msg, 1);
+ if (ret != 1)
+ break;
+ }
+
+ if (ret == 1) {
+ ret = 0;
+ } else {
+ dev_warn(&priv->i2c->dev, "%s: i2c wr failed=%d reg=%02x " \
+ "len=%d\n", KBUILD_MODNAME, ret, reg, len);
+ ret = -EREMOTEIO;
+ }
+
+ return ret;
+}
+
+/* read multiple registers */
+static int tda18218_rd_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len)
+{
+ int ret;
+ u8 buf[reg+len]; /* we must start read always from reg 0x00 */
+ struct i2c_msg msg[2] = {
+ {
+ .addr = priv->cfg->i2c_address,
+ .flags = 0,
+ .len = 1,
+ .buf = "\x00",
+ }, {
+ .addr = priv->cfg->i2c_address,
+ .flags = I2C_M_RD,
+ .len = sizeof(buf),
+ .buf = buf,
+ }
+ };
+
+ ret = i2c_transfer(priv->i2c, msg, 2);
+ if (ret == 2) {
+ memcpy(val, &buf[reg], len);
+ ret = 0;
+ } else {
+ dev_warn(&priv->i2c->dev, "%s: i2c rd failed=%d reg=%02x " \
+ "len=%d\n", KBUILD_MODNAME, ret, reg, len);
+ ret = -EREMOTEIO;
+ }
+
+ return ret;
+}
+
+/* write single register */
+static int tda18218_wr_reg(struct tda18218_priv *priv, u8 reg, u8 val)
+{
+ return tda18218_wr_regs(priv, reg, &val, 1);
+}
+
+/* read single register */
+
+static int tda18218_rd_reg(struct tda18218_priv *priv, u8 reg, u8 *val)
+{
+ return tda18218_rd_regs(priv, reg, val, 1);
+}
+
+static int tda18218_set_params(struct dvb_frontend *fe)
+{
+ struct tda18218_priv *priv = fe->tuner_priv;
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+ u32 bw = c->bandwidth_hz;
+ int ret;
+ u8 buf[3], i, BP_Filter, LP_Fc;
+ u32 LO_Frac;
+ /* TODO: find out correct AGC algorithm */
+ u8 agc[][2] = {
+ { R20_AGC11, 0x60 },
+ { R23_AGC21, 0x02 },
+ { R20_AGC11, 0xa0 },
+ { R23_AGC21, 0x09 },
+ { R20_AGC11, 0xe0 },
+ { R23_AGC21, 0x0c },
+ { R20_AGC11, 0x40 },
+ { R23_AGC21, 0x01 },
+ { R20_AGC11, 0x80 },
+ { R23_AGC21, 0x08 },
+ { R20_AGC11, 0xc0 },
+ { R23_AGC21, 0x0b },
+ { R24_AGC22, 0x1c },
+ { R24_AGC22, 0x0c },
+ };
+
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
+
+ /* low-pass filter cut-off frequency */
+ if (bw <= 6000000) {
+ LP_Fc = 0;
+ priv->if_frequency = 3000000;
+ } else if (bw <= 7000000) {
+ LP_Fc = 1;
+ priv->if_frequency = 3500000;
+ } else {
+ LP_Fc = 2;
+ priv->if_frequency = 4000000;
+ }
+
+ LO_Frac = c->frequency + priv->if_frequency;
+
+ /* band-pass filter */
+ if (LO_Frac < 188000000)
+ BP_Filter = 3;
+ else if (LO_Frac < 253000000)
+ BP_Filter = 4;
+ else if (LO_Frac < 343000000)
+ BP_Filter = 5;
+ else
+ BP_Filter = 6;
+
+ buf[0] = (priv->regs[R1A_IF1] & ~7) | BP_Filter; /* BP_Filter */
+ buf[1] = (priv->regs[R1B_IF2] & ~3) | LP_Fc; /* LP_Fc */
+ buf[2] = priv->regs[R1C_AGC2B];
+ ret = tda18218_wr_regs(priv, R1A_IF1, buf, 3);
+ if (ret)
+ goto error;
+
+ buf[0] = (LO_Frac / 1000) >> 12; /* LO_Frac_0 */
+ buf[1] = (LO_Frac / 1000) >> 4; /* LO_Frac_1 */
+ buf[2] = (LO_Frac / 1000) << 4 |
+ (priv->regs[R0C_MD5] & 0x0f); /* LO_Frac_2 */
+ ret = tda18218_wr_regs(priv, R0A_MD3, buf, 3);
+ if (ret)
+ goto error;
+
+ buf[0] = priv->regs[R0F_MD8] | (1 << 6); /* Freq_prog_Start */
+ ret = tda18218_wr_regs(priv, R0F_MD8, buf, 1);
+ if (ret)
+ goto error;
+
+ buf[0] = priv->regs[R0F_MD8] & ~(1 << 6); /* Freq_prog_Start */
+ ret = tda18218_wr_regs(priv, R0F_MD8, buf, 1);
+ if (ret)
+ goto error;
+
+ /* trigger AGC */
+ for (i = 0; i < ARRAY_SIZE(agc); i++) {
+ ret = tda18218_wr_reg(priv, agc[i][0], agc[i][1]);
+ if (ret)
+ goto error;
+ }
+
+error:
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
+
+ if (ret)
+ dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
+
+ return ret;
+}
+
+static int tda18218_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
+{
+ struct tda18218_priv *priv = fe->tuner_priv;
+ *frequency = priv->if_frequency;
+ dev_dbg(&priv->i2c->dev, "%s: if_frequency=%d\n", __func__, *frequency);
+ return 0;
+}
+
+static int tda18218_sleep(struct dvb_frontend *fe)
+{
+ struct tda18218_priv *priv = fe->tuner_priv;
+ int ret;
+
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
+
+ /* standby */
+ ret = tda18218_wr_reg(priv, R17_PD1, priv->regs[R17_PD1] | (1 << 0));
+
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
+
+ if (ret)
+ dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
+
+ return ret;
+}
+
+static int tda18218_init(struct dvb_frontend *fe)
+{
+ struct tda18218_priv *priv = fe->tuner_priv;
+ int ret;
+
+ /* TODO: calibrations */
+
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
+
+ ret = tda18218_wr_regs(priv, R00_ID, priv->regs, TDA18218_NUM_REGS);
+
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
+
+ if (ret)
+ dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
+
+ return ret;
+}
+
+static int tda18218_release(struct dvb_frontend *fe)
+{
+ kfree(fe->tuner_priv);
+ fe->tuner_priv = NULL;
+ return 0;
+}
+
+static const struct dvb_tuner_ops tda18218_tuner_ops = {
+ .info = {
+ .name = "NXP TDA18218",
+
+ .frequency_min = 174000000,
+ .frequency_max = 864000000,
+ .frequency_step = 1000,
+ },
+
+ .release = tda18218_release,
+ .init = tda18218_init,
+ .sleep = tda18218_sleep,
+
+ .set_params = tda18218_set_params,
+
+ .get_if_frequency = tda18218_get_if_frequency,
+};
+
+struct dvb_frontend *tda18218_attach(struct dvb_frontend *fe,
+ struct i2c_adapter *i2c, struct tda18218_config *cfg)
+{
+ struct tda18218_priv *priv = NULL;
+ u8 uninitialized_var(val);
+ int ret;
+ /* chip default registers values */
+ static u8 def_regs[] = {
+ 0xc0, 0x88, 0x00, 0x8e, 0x03, 0x00, 0x00, 0xd0, 0x00, 0x40,
+ 0x00, 0x00, 0x07, 0xff, 0x84, 0x09, 0x00, 0x13, 0x00, 0x00,
+ 0x01, 0x84, 0x09, 0xf0, 0x19, 0x0a, 0x8e, 0x69, 0x98, 0x01,
+ 0x00, 0x58, 0x10, 0x40, 0x8c, 0x00, 0x0c, 0x48, 0x85, 0xc9,
+ 0xa7, 0x00, 0x00, 0x00, 0x30, 0x81, 0x80, 0x00, 0x39, 0x00,
+ 0x8a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf6, 0xf6
+ };
+
+ priv = kzalloc(sizeof(struct tda18218_priv), GFP_KERNEL);
+ if (priv == NULL)
+ return NULL;
+
+ priv->cfg = cfg;
+ priv->i2c = i2c;
+ fe->tuner_priv = priv;
+
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
+
+ /* check if the tuner is there */
+ ret = tda18218_rd_reg(priv, R00_ID, &val);
+ dev_dbg(&priv->i2c->dev, "%s: ret=%d chip id=%02x\n", __func__, ret,
+ val);
+ if (ret || val != def_regs[R00_ID]) {
+ kfree(priv);
+ return NULL;
+ }
+
+ dev_info(&priv->i2c->dev,
+ "%s: NXP TDA18218HN successfully identified\n",
+ KBUILD_MODNAME);
+
+ memcpy(&fe->ops.tuner_ops, &tda18218_tuner_ops,
+ sizeof(struct dvb_tuner_ops));
+ memcpy(priv->regs, def_regs, sizeof(def_regs));
+
+ /* loop-through enabled chip default register values */
+ if (priv->cfg->loop_through) {
+ priv->regs[R17_PD1] = 0xb0;
+ priv->regs[R18_PD2] = 0x59;
+ }
+
+ /* standby */
+ ret = tda18218_wr_reg(priv, R17_PD1, priv->regs[R17_PD1] | (1 << 0));
+ if (ret)
+ dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
+
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
+
+ return fe;
+}
+EXPORT_SYMBOL(tda18218_attach);
+
+MODULE_DESCRIPTION("NXP TDA18218HN silicon tuner driver");
+MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
+MODULE_LICENSE("GPL");
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