[media] si2157: Silicon Labs Si2157 silicon tuner driver

Silicon Labs Si2157 silicon tuner driver.
Currently it supports only DVB-T.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 244 insertions, 0 deletions

diff --git a/drivers/media/tuners/si2157.c b/drivers/media/tuners/si2157.c
new file mode 100644
index 000000000000..953f2e3f1489
--- /dev/null
+++ b/drivers/media/tuners/si2157.c
@@ -0,0 +1,244 @@
+#include "si2157_priv.h"
+
+/* execute firmware command */
+static int si2157_cmd_execute(struct si2157 *s, struct si2157_cmd *cmd)
+{
+        int ret;
+        u8 buf[1];
+        unsigned long timeout;
+
+        mutex_lock(&s->i2c_mutex);
+
+        if (cmd->len) {
+                /* write cmd and args for firmware */
+                ret = i2c_master_send(s->client, cmd->args, cmd->len);
+                if (ret < 0) {
+                        goto err_mutex_unlock;
+                } else if (ret != cmd->len) {
+                        ret = -EREMOTEIO;
+                        goto err_mutex_unlock;
+                }
+        }
+
+        /* wait cmd execution terminate */
+        #define TIMEOUT 80
+        timeout = jiffies + msecs_to_jiffies(TIMEOUT);
+        while (!time_after(jiffies, timeout)) {
+                ret = i2c_master_recv(s->client, buf, 1);
+                if (ret < 0) {
+                        goto err_mutex_unlock;
+                } else if (ret != 1) {
+                        ret = -EREMOTEIO;
+                        goto err_mutex_unlock;
+                }
+
+                /* firmware ready? */
+                if ((buf[0] >> 7) & 0x01)
+                        break;
+        }
+
+        dev_dbg(&s->client->dev, "%s: cmd execution took %d ms\n", __func__,
+                        jiffies_to_msecs(jiffies) -
+                        (jiffies_to_msecs(timeout) - TIMEOUT));
+
+        if (!(buf[0] >> 7) & 0x01) {
+                ret = -ETIMEDOUT;
+                goto err_mutex_unlock;
+        } else {
+                ret = 0;
+        }
+
+err_mutex_unlock:
+        mutex_unlock(&s->i2c_mutex);
+        if (ret)
+                goto err;
+
+        return 0;
+err:
+        dev_dbg(&s->client->dev, "%s: failed=%d\n", __func__, ret);
+        return ret;
+}
+
+static int si2157_init(struct dvb_frontend *fe)
+{
+        struct si2157 *s = fe->tuner_priv;
+
+        dev_dbg(&s->client->dev, "%s:\n", __func__);
+
+        s->active = true;
+
+        return 0;
+}
+
+static int si2157_sleep(struct dvb_frontend *fe)
+{
+        struct si2157 *s = fe->tuner_priv;
+
+        dev_dbg(&s->client->dev, "%s:\n", __func__);
+
+        s->active = false;
+
+        return 0;
+}
+
+static int si2157_set_params(struct dvb_frontend *fe)
+{
+        struct si2157 *s = fe->tuner_priv;
+        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+        int ret;
+        struct si2157_cmd cmd;
+
+        dev_dbg(&s->client->dev,
+                        "%s: delivery_system=%d frequency=%u bandwidth_hz=%u\n",
+                        __func__, c->delivery_system, c->frequency,
+                        c->bandwidth_hz);
+
+        if (!s->active) {
+                ret = -EAGAIN;
+                goto err;
+        }
+
+        /* configure? */
+        cmd.args[0] = 0xc0;
+        cmd.args[1] = 0x00;
+        cmd.args[2] = 0x0c;
+        cmd.args[3] = 0x00;
+        cmd.args[4] = 0x00;
+        cmd.args[5] = 0x01;
+        cmd.args[6] = 0x01;
+        cmd.args[7] = 0x01;
+        cmd.args[8] = 0x01;
+        cmd.args[9] = 0x01;
+        cmd.args[10] = 0x01;
+        cmd.args[11] = 0x02;
+        cmd.args[12] = 0x00;
+        cmd.args[13] = 0x00;
+        cmd.args[14] = 0x01;
+        cmd.len = 15;
+        ret = si2157_cmd_execute(s, &cmd);
+        if (ret)
+                goto err;
+
+        cmd.args[0] = 0x02;
+        cmd.len = 1;
+        ret = si2157_cmd_execute(s, &cmd);
+        if (ret)
+                goto err;
+
+        cmd.args[0] = 0x01;
+        cmd.args[1] = 0x01;
+        cmd.len = 2;
+        ret = si2157_cmd_execute(s, &cmd);
+        if (ret)
+                goto err;
+
+        /* set frequency */
+        cmd.args[0] = 0x41;
+        cmd.args[1] = 0x00;
+        cmd.args[2] = 0x00;
+        cmd.args[3] = 0x00;
+        cmd.args[4] = (c->frequency >>  0) & 0xff;
+        cmd.args[5] = (c->frequency >>  8) & 0xff;
+        cmd.args[6] = (c->frequency >> 16) & 0xff;
+        cmd.args[7] = (c->frequency >> 24) & 0xff;
+        cmd.len = 8;
+        ret = si2157_cmd_execute(s, &cmd);
+        if (ret)
+                goto err;
+
+        return 0;
+err:
+        dev_dbg(&s->client->dev, "%s: failed=%d\n", __func__, ret);
+        return ret;
+}
+
+static const struct dvb_tuner_ops si2157_tuner_ops = {
+        .info = {
+                .name           = "Silicon Labs Si2157",
+                .frequency_min  = 174000000,
+                .frequency_max  = 862000000,
+        },
+
+        .init = si2157_init,
+        .sleep = si2157_sleep,
+        .set_params = si2157_set_params,
+};
+
+static int si2157_probe(struct i2c_client *client,
+                const struct i2c_device_id *id)
+{
+        struct si2157_config *cfg = client->dev.platform_data;
+        struct dvb_frontend *fe = cfg->fe;
+        struct si2157 *s;
+        struct si2157_cmd cmd;
+        int ret;
+
+        s = kzalloc(sizeof(struct si2157), GFP_KERNEL);
+        if (!s) {
+                ret = -ENOMEM;
+                dev_err(&client->dev, "%s: kzalloc() failed\n", KBUILD_MODNAME);
+                goto err;
+        }
+
+        s->client = client;
+        s->fe = cfg->fe;
+        mutex_init(&s->i2c_mutex);
+
+        /* check if the tuner is there */
+        cmd.len = 0;
+        ret = si2157_cmd_execute(s, &cmd);
+        if (ret)
+                goto err;
+
+        fe->tuner_priv = s;
+        memcpy(&fe->ops.tuner_ops, &si2157_tuner_ops,
+                        sizeof(struct dvb_tuner_ops));
+
+        i2c_set_clientdata(client, s);
+
+        dev_info(&s->client->dev,
+                        "%s: Silicon Labs Si2157 successfully attached\n",
+                        KBUILD_MODNAME);
+        return 0;
+err:
+        dev_dbg(&client->dev, "%s: failed=%d\n", __func__, ret);
+        kfree(s);
+
+        return ret;
+}
+
+static int si2157_remove(struct i2c_client *client)
+{
+        struct si2157 *s = i2c_get_clientdata(client);
+        struct dvb_frontend *fe = s->fe;
+
+        dev_dbg(&client->dev, "%s:\n", __func__);
+
+        memset(&fe->ops.tuner_ops, 0, sizeof(struct dvb_tuner_ops));
+        fe->tuner_priv = NULL;
+        kfree(s);
+
+        return 0;
+}
+
+static const struct i2c_device_id si2157_id[] = {
+        {"si2157", 0},
+        {}
+};
+MODULE_DEVICE_TABLE(i2c, si2157_id);
+
+static struct i2c_driver si2157_driver = {
+        .driver = {
+                .owner  = THIS_MODULE,
+                .name   = "si2157",
+        },
+        .probe          = si2157_probe,
+        .remove         = si2157_remove,
+        .id_table       = si2157_id,
+};
+
+module_i2c_driver(si2157_driver);
+
+MODULE_DESCRIPTION("Silicon Labs Si2157 silicon tuner driver");
+MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
+MODULE_LICENSE("GPL");