This patch supports i2c interface of si470x. The i2c specific part
exists in radio-si470x-i2c.c file and the common part uses
radio-si470x-common.c file. The '#if defined' is inserted inevitably
because of parts used only si470x usb in the common file.
The current driver version doesn't support the RDS.
Signed-off-by: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>
---
linux/drivers/media/radio/si470x/Kconfig | 13 +
linux/drivers/media/radio/si470x/Makefile | 2 +
.../media/radio/si470x/radio-si470x-common.c | 6 +
.../drivers/media/radio/si470x/radio-si470x-i2c.c | 254 ++++++++++++++++++++
linux/drivers/media/radio/si470x/radio-si470x.h | 6 +
5 files changed, 281 insertions(+), 0 deletions(-)
create mode 100644 linux/drivers/media/radio/si470x/radio-si470x-i2c.c
diff --git a/linux/drivers/media/radio/si470x/Kconfig b/linux/drivers/media/radio/si470x/Kconfig
index 20d05c0..a466654 100644
--- a/linux/drivers/media/radio/si470x/Kconfig
+++ b/linux/drivers/media/radio/si470x/Kconfig
@@ -22,3 +22,16 @@ config USB_SI470X
To compile this driver as a module, choose M here: the
module will be called radio-usb-si470x.
+
+config I2C_SI470X
+ tristate "Silicon Labs Si470x FM Radio Receiver support with I2C"
+ depends on I2C && RADIO_SI470X && !USB_SI470X
+ ---help---
+ This is a driver for I2C devices with the Silicon Labs SI470x
+ chip.
+
+ Say Y here if you want to connect this type of radio to your
+ computer's I2C port.
+
+ To compile this driver as a module, choose M here: the
+ module will be called radio-i2c-si470x.
diff --git a/linux/drivers/media/radio/si470x/Makefile b/linux/drivers/media/radio/si470x/Makefile
index 3cb777f..0696481 100644
--- a/linux/drivers/media/radio/si470x/Makefile
+++ b/linux/drivers/media/radio/si470x/Makefile
@@ -3,5 +3,7 @@
#
radio-usb-si470x-objs := radio-si470x-usb.o radio-si470x-common.o
+radio-i2c-si470x-objs := radio-si470x-i2c.o radio-si470x-common.o
obj-$(CONFIG_USB_SI470X) += radio-usb-si470x.o
+obj-$(CONFIG_I2C_SI470X) += radio-i2c-si470x.o
diff --git a/linux/drivers/media/radio/si470x/radio-si470x-common.c b/linux/drivers/media/radio/si470x/radio-si470x-common.c
index 84cbea3..0a48159 100644
--- a/linux/drivers/media/radio/si470x/radio-si470x-common.c
+++ b/linux/drivers/media/radio/si470x/radio-si470x-common.c
@@ -581,8 +581,12 @@ static int si470x_vidioc_g_tuner(struct file *file, void *priv,
/* driver constants */
strcpy(tuner->name, "FM");
tuner->type = V4L2_TUNER_RADIO;
+#if defined(CONFIG_USB_SI470X) || defined(CONFIG_USB_SI470X_MODULE)
tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
V4L2_TUNER_CAP_RDS;
+#else
+ tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
+#endif
/* range limits */
switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
@@ -608,10 +612,12 @@ static int si470x_vidioc_g_tuner(struct file *file, void *priv,
tuner->rxsubchans = V4L2_TUNER_SUB_MONO;
else
tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
+#if defined(CONFIG_USB_SI470X) || defined(CONFIG_USB_SI470X_MODULE)
/* If there is a reliable method of detecting an RDS channel,
then this code should check for that before setting this
RDS subchannel. */
tuner->rxsubchans |= V4L2_TUNER_SUB_RDS;
+#endif
/* mono/stereo selector */
if ((radio->registers[POWERCFG] & POWERCFG_MONO) == 0)
diff --git a/linux/drivers/media/radio/si470x/radio-si470x-i2c.c b/linux/drivers/media/radio/si470x/radio-si470x-i2c.c
new file mode 100644
index 0000000..2181021
--- /dev/null
+++ b/linux/drivers/media/radio/si470x/radio-si470x-i2c.c
@@ -0,0 +1,254 @@
+/*
+ * drivers/media/radio/si470x/radio-si470x-i2c.c
+ *
+ * I2C driver for radios with Silicon Labs Si470x FM Radio Receivers
+ *
+ * Copyright (C) 2009 Samsung Electronics Co.Ltd
+ * Author: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>
+ *
+ * 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.
+ *
+ *
+ * TODO:
+ * - RDS support
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+
+#include "radio-si470x.h"
+
+#define DRIVER_KERNEL_VERSION KERNEL_VERSION(1, 0, 0)
+#define DRIVER_CARD "Silicon Labs Si470x FM Radio Receiver"
+#define DRIVER_VERSION "1.0.0"
+
+/* starting with the upper byte of register 0x0a */
+#define READ_REG_NUM RADIO_REGISTER_NUM
+#define READ_INDEX(i) ((i + RADIO_REGISTER_NUM - 0x0a) % READ_REG_NUM)
+
+static int si470x_get_all_registers(struct si470x_device *radio)
+{
+ int i;
+ u16 buf[READ_REG_NUM];
+ struct i2c_msg msgs[1] = {
+ { radio->client->addr, I2C_M_RD, sizeof(u16) * READ_REG_NUM,
+ (void *)buf },
+ };
+
+ if (i2c_transfer(radio->client->adapter, msgs, 1) != 1)
+ return -EIO;
+
+ for (i = 0; i < READ_REG_NUM; i++)
+ radio->registers[i] = __be16_to_cpu(buf[READ_INDEX(i)]);
+
+ return 0;
+}
+
+int si470x_get_register(struct si470x_device *radio, int regnr)
+{
+ u16 buf[READ_REG_NUM];
+ struct i2c_msg msgs[1] = {
+ { radio->client->addr, I2C_M_RD, sizeof(u16) * READ_REG_NUM,
+ (void *)buf },
+ };
+
+ if (i2c_transfer(radio->client->adapter, msgs, 1) != 1)
+ return -EIO;
+
+ radio->registers[regnr] = __be16_to_cpu(buf[READ_INDEX(regnr)]);
+
+ return 0;
+}
+
+/* starting with the upper byte of register 0x02h */
+#define WRITE_REG_NUM 8
+#define WRITE_INDEX(i) (i + 0x02)
+
+int si470x_set_register(struct si470x_device *radio, int regnr)
+{
+ int i;
+ u16 buf[WRITE_REG_NUM];
+ struct i2c_msg msgs[1] = {
+ { radio->client->addr, 0, sizeof(u16) * WRITE_REG_NUM,
+ (void *)buf },
+ };
+
+ for (i = 0; i < WRITE_REG_NUM; i++)
+ buf[i] = __cpu_to_be16(radio->registers[WRITE_INDEX(i)]);
+
+ if (i2c_transfer(radio->client->adapter, msgs, 1) != 1)
+ return -EIO;
+
+ return 0;
+}
+
+int si470x_disconnect_check(struct si470x_device *radio)
+{
+ return 0;
+}
+
+static int si470x_fops_open(struct file *file)
+{
+ struct si470x_device *radio = video_drvdata(file);
+ int retval = 0;
+
+ mutex_lock(&radio->lock);
+ radio->users++;
+
+ if (radio->users == 1)
+ /* start radio */
+ retval = si470x_start(radio);
+ mutex_unlock(&radio->lock);
+
+ return retval;
+}
+
+static int si470x_fops_release(struct file *file)
+{
+ struct si470x_device *radio = video_drvdata(file);
+ int retval = 0;
+
+ /* safety check */
+ if (!radio)
+ return -ENODEV;
+
+ mutex_lock(&radio->lock);
+ radio->users--;
+ if (radio->users == 0)
+ /* stop radio */
+ retval = si470x_stop(radio);
+ mutex_unlock(&radio->lock);
+
+ return retval;
+}
+
+const struct v4l2_file_operations si470x_fops = {
+ .owner = THIS_MODULE,
+ .ioctl = video_ioctl2,
+ .open = si470x_fops_open,
+ .release = si470x_fops_release,
+};
+
+int si470x_vidioc_querycap(struct file *file, void *priv,
+ struct v4l2_capability *capability)
+{
+ strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
+ strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
+ capability->version = DRIVER_KERNEL_VERSION;
+ capability->capabilities = V4L2_CAP_HW_FREQ_SEEK |
+ V4L2_CAP_TUNER | V4L2_CAP_RADIO;
+
+ return 0;
+}
+
+static int __devinit si470x_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct si470x_device *radio;
+ int retval = 0;
+
+ /* private data allocation and initialization */
+ radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
+ if (!radio) {
+ retval = -ENOMEM;
+ goto err_initial;
+ }
+ radio->client = client;
+ radio->users = 0;
+ mutex_init(&radio->lock);
+
+ /* video device allocation and initialization */
+ radio->videodev = video_device_alloc();
+ if (!radio->videodev) {
+ retval = -ENOMEM;
+ goto err_radio;
+ }
+ memcpy(radio->videodev, &si470x_viddev_template,
+ sizeof(si470x_viddev_template));
+ video_set_drvdata(radio->videodev, radio);
+
+ /* power up : need 110ms */
+ radio->registers[POWERCFG] = POWERCFG_ENABLE;
+ if (si470x_set_register(radio, POWERCFG) < 0) {
+ retval = -EIO;
+ goto err_all;
+ }
+ msleep(110);
+
+ /* show some infos about the specific si470x device */
+ if (si470x_get_all_registers(radio) < 0) {
+ retval = -EIO;
+ goto err_radio;
+ }
+ dev_info(&client->dev, "DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
+ radio->registers[DEVICEID], radio->registers[CHIPID]);
+
+ /* set initial frequency */
+ si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
+
+ /* register video device */
+ retval = video_register_device(radio->videodev, VFL_TYPE_RADIO, -1);
+ if (retval) {
+ dev_warn(&client->dev, "Could not register video device\n");
+ goto err_all;
+ }
+
+ i2c_set_clientdata(client, radio);
+
+ return 0;
+err_all:
+ video_device_release(radio->videodev);
+err_radio:
+ kfree(radio);
+err_initial:
+ return retval;
+}
+
+static __devexit int si470x_i2c_remove(struct i2c_client *client)
+{
+ struct si470x_device *radio = i2c_get_clientdata(client);
+
+ video_unregister_device(radio->videodev);
+ kfree(radio);
+ i2c_set_clientdata(client, NULL);
+
+ return 0;
+}
+
+static const struct i2c_device_id si470x_i2c_id[] = {
+ { "si470x", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, si470x_i2c_id);
+
+static struct i2c_driver si470x_i2c_driver = {
+ .driver = {
+ .name = "si470x",
+ .owner = THIS_MODULE,
+ },
+ .probe = si470x_i2c_probe,
+ .remove = __devexit_p(si470x_i2c_remove),
+ .id_table = si470x_i2c_id,
+};
+
+static int __init si470x_i2c_init(void)
+{
+ return i2c_add_driver(&si470x_i2c_driver);
+}
+module_init(si470x_i2c_init);
+
+static void __exit si470x_i2c_exit(void)
+{
+ i2c_del_driver(&si470x_i2c_driver);
+}
+module_exit(si470x_i2c_exit);
+
+MODULE_DESCRIPTION("i2c radio driver for si470x fm radio receivers");
+MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
diff --git a/linux/drivers/media/radio/si470x/radio-si470x.h b/linux/drivers/media/radio/si470x/radio-si470x.h
index 6305f6b..2eef291 100644
--- a/linux/drivers/media/radio/si470x/radio-si470x.h
+++ b/linux/drivers/media/radio/si470x/radio-si470x.h
@@ -143,6 +143,11 @@
struct si470x_device {
struct video_device *videodev;
+#if defined(CONFIG_I2C_SI470X) || defined(CONFIG_I2C_SI470X_MODULE)
+ struct i2c_client *client;
+#endif
+
+#if defined(CONFIG_USB_SI470X) || defined(CONFIG_USB_SI470X_MODULE)
/* reference to USB and video device */
struct usb_device *usbdev;
struct usb_interface *intf;
@@ -160,6 +165,7 @@ struct si470x_device {
/* driver management */
unsigned char disconnected;
struct mutex disconnect_lock;
+#endif
unsigned int users;
/* Silabs internal registers (0..15) */
--
1.6.0.4
--
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