[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>

diff --git a/drivers/media/tuners/Kconfig b/drivers/media/tuners/Kconfig
index a1284889cd1537ad7f16d32b74300d7021be080a..22b6b8bb1d93b5287744fb148cc162fe3b2ba051 100644 (file)
--- a/drivers/media/tuners/Kconfig
+++ b/drivers/media/tuners/Kconfig
@@ -230,6 +230,13 @@ config MEDIA_TUNER_TUA9001
        help
          Infineon TUA 9001 silicon tuner driver.
 
+config MEDIA_TUNER_SI2157
+       tristate "Silicon Labs Si2157 silicon tuner"
+       depends on MEDIA_SUPPORT && I2C
+       default m if !MEDIA_SUBDRV_AUTOSELECT
+       help
+         Silicon Labs Si2157 silicon tuner driver.
+
 config MEDIA_TUNER_IT913X
        tristate "ITE Tech IT913x silicon tuner"
        depends on MEDIA_SUPPORT && I2C

diff --git a/drivers/media/tuners/Makefile b/drivers/media/tuners/Makefile
index efe82a904b123ec66d80ca8a930d163ac66b3ba4..a6ff0c628dfaa89a69d1c8ef8a9daa54499dc80f 100644 (file)
--- a/drivers/media/tuners/Makefile
+++ b/drivers/media/tuners/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_MEDIA_TUNER_TDA18212) += tda18212.o
 obj-$(CONFIG_MEDIA_TUNER_E4000) += e4000.o
 obj-$(CONFIG_MEDIA_TUNER_FC2580) += fc2580.o
 obj-$(CONFIG_MEDIA_TUNER_TUA9001) += tua9001.o
+obj-$(CONFIG_MEDIA_TUNER_SI2157) += si2157.o
 obj-$(CONFIG_MEDIA_TUNER_M88TS2022) += m88ts2022.o
 obj-$(CONFIG_MEDIA_TUNER_FC0011) += fc0011.o
 obj-$(CONFIG_MEDIA_TUNER_FC0012) += fc0012.o

diff --git a/drivers/media/tuners/si2157.c b/drivers/media/tuners/si2157.c
new file mode 100644 (file)
index 0000000..953f2e3
--- /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");

diff --git a/drivers/media/tuners/si2157.h b/drivers/media/tuners/si2157.h
new file mode 100644 (file)
index 0000000..5de47d4
--- /dev/null
+++ b/drivers/media/tuners/si2157.h
@@ -0,0 +1,18 @@
+#ifndef SI2157_H
+#define SI2157_H
+
+#include <linux/kconfig.h>
+#include "dvb_frontend.h"
+
+/*
+ * I2C address
+ * 0x60
+ */
+struct si2157_config {
+       /*
+        * frontend
+        */
+       struct dvb_frontend *fe;
+};
+
+#endif

diff --git a/drivers/media/tuners/si2157_priv.h b/drivers/media/tuners/si2157_priv.h
new file mode 100644 (file)
index 0000000..6018851
--- /dev/null
+++ b/drivers/media/tuners/si2157_priv.h
@@ -0,0 +1,21 @@
+#ifndef SI2157_PRIV_H
+#define SI2157_PRIV_H
+
+#include "si2157.h"
+
+/* state struct */
+struct si2157 {
+       struct mutex i2c_mutex;
+       struct i2c_client *client;
+       struct dvb_frontend *fe;
+       bool active;
+};
+
+/* firmare command struct */
+#define SI2157_ARGLEN      30
+struct si2157_cmd {
+       u8 args[SI2157_ARGLEN];
+       unsigned len;
+};
+
+#endif