V4L/DVB (10452): Add Freescale MC44S803 tuner driver

Add Freescale MC44S803 tuner driver.

Signed-off-by: Jochen Friedrich <jochen@scram.de>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 371 insertions, 0 deletions

diff --git a/drivers/media/common/tuners/mc44s803.c b/drivers/media/common/tuners/mc44s803.c
new file mode 100644
index 000000000000..20c4485ce16a
--- /dev/null
+++ b/drivers/media/common/tuners/mc44s803.c
@@ -0,0 +1,371 @@
+/*
+ *  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 "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 dvb_frontend_parameters *params)
+{
+        struct mc44s803_priv *priv = fe->tuner_priv;
+        u32 r1, r2, n1, n2, lo1, lo2, freq, val;
+        int err;
+
+        priv->frequency = params->frequency;
+
+        r1 = MC44S803_OSC / 1000000;
+        r2 = MC44S803_OSC /  100000;
+
+        n1 = (params->frequency + MC44S803_IF1 + 500000) / 1000000;
+        freq = MC44S803_OSC / r1 * n1;
+        lo1 = ((60 * n1) + (r1 / 2)) / r1;
+        freq = freq - params->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 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
+};
+
+/* 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");