[Linux-kernel-mentees] [PATCH 1/1] media: dvb_dummy_tuner: implement driver skeleton

Daniel W. S. Almeida dwlsalmeida at gmail.com
Thu Jan 9 15:24:08 UTC 2020


From: "Daniel W. S. Almeida" <dwlsalmeida at gmail.com>

Implement the skeleton for the tuner driver in a separate file.

Signed-off-by: Daniel W. S. Almeida <dwlsalmeida at gmail.com>
---
 drivers/media/tuners/Kconfig           |   7 ++
 drivers/media/tuners/Makefile          |   1 +
 drivers/media/tuners/dvb_dummy_tuner.c | 153 +++++++++++++++++++++++++
 drivers/media/tuners/dvb_dummy_tuner.h |  20 ++++
 4 files changed, 181 insertions(+)
 create mode 100644 drivers/media/tuners/dvb_dummy_tuner.c
 create mode 100644 drivers/media/tuners/dvb_dummy_tuner.h

diff --git a/drivers/media/tuners/Kconfig b/drivers/media/tuners/Kconfig
index e104bb7766e1..efa1591fe0ae 100644
--- a/drivers/media/tuners/Kconfig
+++ b/drivers/media/tuners/Kconfig
@@ -296,4 +296,11 @@ config MEDIA_TUNER_QM1D1B0004
 	default m if !MEDIA_SUBDRV_AUTOSELECT
 	help
 	  Sharp QM1D1B0004 ISDB-S tuner driver.
+
+config MEDIA_TUNER_DVB_DUMMY_TUNER
+	tristate "Dummy tuner"
+	depends on MEDIA_SUPPORT && I2C
+	default m if !MEDIA_SUBDRV_AUTOSELECT
+	help
+	  Dummy tuner driver for common TV standards.
 endmenu
diff --git a/drivers/media/tuners/Makefile b/drivers/media/tuners/Makefile
index 7b4f8423501e..f98de1cf2e19 100644
--- a/drivers/media/tuners/Makefile
+++ b/drivers/media/tuners/Makefile
@@ -44,5 +44,6 @@ obj-$(CONFIG_MEDIA_TUNER_QM1D1C0042) += qm1d1c0042.o
 obj-$(CONFIG_MEDIA_TUNER_QM1D1B0004) += qm1d1b0004.o
 obj-$(CONFIG_MEDIA_TUNER_M88RS6000T) += m88rs6000t.o
 obj-$(CONFIG_MEDIA_TUNER_TDA18250) += tda18250.o
+obj-$(CONFIG_MEDIA_TUNER_DVB_DUMMY_TUNER) += dvb_dummy_tuner.o
 
 ccflags-y += -I$(srctree)/drivers/media/dvb-frontends
diff --git a/drivers/media/tuners/dvb_dummy_tuner.c b/drivers/media/tuners/dvb_dummy_tuner.c
new file mode 100644
index 000000000000..63d2e47d4739
--- /dev/null
+++ b/drivers/media/tuners/dvb_dummy_tuner.c
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Driver for Dummy Frontend
+ *
+ *  Written by Daniel W. S. Almeida <dwlsalmeida at gmail.com>
+ */
+
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <media/dvb_frontend.h>
+#include "dvb_dummy_tuner.h"
+
+struct dvb_dummy_tuner_dev {
+	struct dvb_frontend *fe;
+};
+
+static void dvb_dummy_tuner_release(struct dvb_frontend *fe)
+{
+}
+
+static int dvb_dummy_tuner_init(struct dvb_frontend *fe)
+{
+	return 0;
+}
+
+static int dvb_dummy_tuner_sleep(struct dvb_frontend *fe)
+{
+	return 0;
+}
+
+static int dvb_dummy_tuner_suspend(struct dvb_frontend *fe)
+{
+	return 0;
+}
+
+static int dvb_dummy_tuner_resume(struct dvb_frontend *fe)
+{
+	return 0;
+}
+
+static int dvb_dummy_tuner_set_params(struct dvb_frontend *fe)
+{
+	return 0;
+}
+
+static int dvb_dummy_tuner_set_config(struct dvb_frontend *fe, void *priv_cfg)
+{
+	return 0;
+}
+
+static int dvb_dummy_tuner_get_frequency(struct dvb_frontend *fe,
+					 u32 *frequency)
+{
+	return 0;
+}
+
+static int dvb_dummy_tuner_get_bandwidth(struct dvb_frontend *fe,
+					 u32 *bandwidth)
+{
+	return 0;
+}
+
+static int dvb_dummy_tuner_get_if_frequency(struct dvb_frontend *fe,
+					    u32 *frequency)
+{
+	return 0;
+}
+
+static int dvb_dummy_tuner_get_status(struct dvb_frontend *fe, u32 *status)
+{
+	return 0;
+}
+
+static const struct dvb_tuner_ops dvb_dummy_tuner_ops = {
+	.release = dvb_dummy_tuner_release,
+	.init = dvb_dummy_tuner_init,
+	.sleep = dvb_dummy_tuner_sleep,
+	.suspend = dvb_dummy_tuner_suspend,
+	.resume = dvb_dummy_tuner_resume,
+	.set_params = dvb_dummy_tuner_set_params,
+	.set_config = dvb_dummy_tuner_set_config,
+	.get_bandwidth = dvb_dummy_tuner_get_bandwidth,
+	.get_frequency = dvb_dummy_tuner_get_frequency,
+	.get_if_frequency = dvb_dummy_tuner_get_if_frequency,
+	.get_status = dvb_dummy_tuner_get_status,
+};
+
+static const struct i2c_device_id dvb_dummy_tuner_i2c_id_table[] = {
+	{"dvb_dummy_tuner", 0},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, dvb_dummy_tuner_i2c_id_table);
+
+static int dvb_dummy_tuner_i2c_probe(struct i2c_client *client,
+				     const struct i2c_device_id *id)
+{
+	int ret = 0;
+	struct dvb_dummy_tuner_config *config = client->dev.platform_data;
+	struct dvb_frontend *fe = config->fe;
+	struct dvb_dummy_tuner_dev *tuner_dev = NULL;
+
+	tuner_dev = kzalloc(sizeof(*tuner_dev), GFP_KERNEL);
+	if (!tuner_dev) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	i2c_set_clientdata(client, tuner_dev);
+	tuner_dev->fe = config->fe;
+
+	memcpy(&fe->ops.tuner_ops,
+	       &dvb_dummy_tuner_ops,
+	       sizeof(struct dvb_tuner_ops));
+
+	fe->tuner_priv = client;
+
+	pr_debug("%s: Successfully probed %s\n", __func__, client->name);
+	return ret;
+
+err:
+	pr_err("%s: failed\n", __func__);
+	return ret;
+}
+
+static int dvb_dummy_tuner_i2c_remove(struct i2c_client *client)
+{
+	struct dvb_dummy_tuner_dev *tuner_dev = i2c_get_clientdata(client);
+	struct dvb_frontend *fe = tuner_dev->fe;
+
+	memset(&fe->ops.tuner_ops, 0, sizeof(struct dvb_tuner_ops));
+	fe->tuner_priv = NULL;
+	kfree(tuner_dev);
+
+	return 0;
+}
+
+static struct i2c_driver dvb_dummy_tuner_i2c_driver = {
+	.driver = {
+		.name = "dvb_dummy_tuner",
+		.suppress_bind_attrs = true,
+	},
+	.probe		= dvb_dummy_tuner_i2c_probe,
+	.remove		= dvb_dummy_tuner_i2c_remove,
+	.id_table	= dvb_dummy_tuner_i2c_id_table,
+};
+module_i2c_driver(dvb_dummy_tuner_i2c_driver);
+
+MODULE_DESCRIPTION("DVB Dummy Tuner");
+MODULE_AUTHOR("Daniel W. S. Almeida");
+MODULE_LICENSE("GPL");
diff --git a/drivers/media/tuners/dvb_dummy_tuner.h b/drivers/media/tuners/dvb_dummy_tuner.h
new file mode 100644
index 000000000000..fde7628258fa
--- /dev/null
+++ b/drivers/media/tuners/dvb_dummy_tuner.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * DVB Dummy Tuner
+ *
+ */
+#ifndef __TUNER_DVB_DUMMY_TUNER_H__
+#define __TUNER_DVB_DUMMY_TUNER_H__
+
+#include <media/dvb_frontend.h>
+/**
+ * struct dvb_dummy_tuner_config - configuration parameters for the dummy tuner
+ *
+ * @fe:
+ *	frontend returned by driver
+ */
+struct dvb_dummy_tuner_config {
+	struct dvb_frontend *fe;
+};
+
+#endif /*__TUNER_DVB_DUMMY_TUNER_H__ */
-- 
2.24.1



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