All of lore.kernel.org
 help / color / mirror / Atom feed
* [V2 PATCH] i2c driver for Maxim max9485 audio clock generator chip
@ 2008-10-22  1:22 Jon Smirl
  0 siblings, 0 replies; only message in thread
From: Jon Smirl @ 2008-10-22  1:22 UTC (permalink / raw)
  To: i2c-GZX6beZjE8VD60Wz+7aTrA

Signed-off-by: Jon Smirl <jonsmirl-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/misc/Kconfig        |    9 ++++
 drivers/misc/Makefile       |    1 
 drivers/misc/max9485.c      |  105 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/i2c/max9485.h |   39 ++++++++++++++++
 4 files changed, 154 insertions(+), 0 deletions(-)
 create mode 100644 drivers/misc/max9485.c
 create mode 100644 include/linux/i2c/max9485.h

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index efd3aa0..010baa6 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -391,6 +391,15 @@ config ATMEL_SSC
 
 	  If unsure, say N.
 
+config MAX9485
+	tristate "Maxim MAX9485 Programmable Audio Clock Generator"
+	help
+	  If you say yes here you get support for Maxim MAX9485 
+	  Programmable Audio Clock Generator.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called max9485.
+
 config INTEL_MENLOW
 	tristate "Thermal Management driver for Intel menlow platform"
 	depends on ACPI_THERMAL
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index c6c13f6..6133434 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_SONY_LAPTOP)	+= sony-laptop.o
 obj-$(CONFIG_THINKPAD_ACPI)	+= thinkpad_acpi.o
 obj-$(CONFIG_FUJITSU_LAPTOP)	+= fujitsu-laptop.o
 obj-$(CONFIG_EEPROM_93CX6)	+= eeprom_93cx6.o
+obj-$(CONFIG_MAX9485)		+= max9485.o
 obj-$(CONFIG_INTEL_MENLOW)	+= intel_menlow.o
 obj-$(CONFIG_ENCLOSURE_SERVICES) += enclosure.o
 obj-$(CONFIG_KGDB_TESTS)	+= kgdbts.o
diff --git a/drivers/misc/max9485.c b/drivers/misc/max9485.c
new file mode 100644
index 0000000..c1316f2
--- /dev/null
+++ b/drivers/misc/max9485.c
@@ -0,0 +1,105 @@
+/*
+ * Maxim max9485 Programmable Audio Clock Generator driver
+ *
+ * Written by: Jon Smirl <jonsmirl-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
+ *
+ * Copyright (C) 2008 Digispeaker.com
+ * Copyright (C) 2008 Jon Smirl <jonsmirl-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * This device is usually under the control of ALSA and should not be changed
+ * from userspace. The main purpose of this driver is to locate the i2c address
+ * of where the chip is located.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/sysfs.h>
+#include <linux/i2c/max9485.h>
+
+int max9485_set(struct i2c_client *max9485, u8 value)
+{
+	return i2c_smbus_write_byte(max9485, value);
+}
+EXPORT_SYMBOL_GPL(max9485_set);
+
+/*
+ * Display the only register
+ */
+static ssize_t max9485_show(struct device *dev, struct device_attribute *attr,
+			   char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	int rc;
+
+	rc = i2c_smbus_read_byte(client);
+	if (rc < 0)
+		return rc;
+
+	return sprintf(buf, "%s%s%s%s%s%s",
+			(rc & MAX9485_MCLK ? "MCLK+" : ""),
+			(rc & MAX9485_CLK_OUT_2 ? "CLK2+" : ""),
+			(rc & MAX9485_CLK_OUT_2 ? "CLK1+" : ""),
+			(rc & MAX9485_DOUBLED ? "DOUBLED+" : ""),
+			(rc & MAX9485_SCALE_768 ? "768x+" : (rc & MAX9485_SCALE_384 ? "384x+" : "256x+")),
+			((rc & 3) == MAX9485_FREQUENCY_48 ? "48Khz" :
+			((rc & 3) == MAX9485_FREQUENCY_441 ? "44.1Khz" :
+			((rc & 3) == MAX9485_FREQUENCY_32 ? "32Khz" : "12Khz"))));
+}
+static DEVICE_ATTR(max9485, S_IRUGO, max9485_show, NULL);
+
+/*
+ * Called when a max9485 device is matched with this driver
+ */
+static int max9485_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE)) {
+		dev_err(&client->dev, "i2c bus does not support the max9485\n");
+		return -ENODEV;
+	}
+	return sysfs_create_file(&client->dev.kobj, &dev_attr_max9485.attr);
+}
+
+static int max9485_remove(struct i2c_client *client)
+{
+	sysfs_remove_file(&client->dev.kobj, &dev_attr_max9485.attr);
+	return 0;
+}
+
+static const struct i2c_device_id max9485_id[] = {
+	{ "max9485", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, max9485_id);
+
+static struct i2c_driver max9485_driver = {
+	.driver = {
+		.name = "max9485",
+	},
+	.probe = max9485_probe,
+	.remove = max9485_remove,
+	.id_table = max9485_id,
+};
+
+static int __init max9485_init(void)
+{
+	return i2c_add_driver(&max9485_driver);
+}
+
+static void __exit max9485_exit(void)
+{
+	i2c_del_driver(&max9485_driver);
+}
+
+MODULE_AUTHOR("Jon Smirl <jonsmirl-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org");
+MODULE_DESCRIPTION("Maxim MAX9485 Programmable Audio Clock Generator driver");
+MODULE_LICENSE("GPL");
+
+module_init(max9485_init);
+module_exit(max9485_exit);
diff --git a/include/linux/i2c/max9485.h b/include/linux/i2c/max9485.h
new file mode 100644
index 0000000..81543bb
--- /dev/null
+++ b/include/linux/i2c/max9485.h
@@ -0,0 +1,39 @@
+/*
+ * Maxim max9485 Programmable Audio Clock Generator driver
+ *
+ * Written by: Jon Smirl <jonsmirl-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
+ *
+ * Copyright (C) 2008 Digispeaker.com
+ * Copyright (C) 2008 Jon Smirl <jonsmirl-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __LINUX_I2C_MAX9485_H
+#define __LINUX_I2C_MAX9485_H
+
+struct i2c_client;
+
+/* Defines for Maxim MAX9485 Audio Clock Generator */
+
+#define MAX9485_MCLK         (1 << 7)
+#define MAX9485_CLK_OUT_2    (1 << 6)
+#define MAX9485_CLK_OUT_1    (1 << 5)
+#define MAX9485_DOUBLED      (1 << 4)
+#define MAX9485_SCALE_256    (0 << 2)
+#define MAX9485_SCALE_384    (1 << 2)
+#define MAX9485_SCALE_768    (2 << 2)
+#define MAX9485_FREQUENCY_12  0
+#define MAX9485_FREQUENCY_32  1
+#define MAX9485_FREQUENCY_441 2
+#define MAX9485_FREQUENCY_48  3
+
+/* Combinations that minimize jitter */
+#define MAX9485_245760 (MAX9485_SCALE_256 | MAX9485_FREQUENCY_48 | MAX9485_DOUBLED)
+#define MAX9485_225792 (MAX9485_SCALE_256 | MAX9485_FREQUENCY_441 | MAX9485_DOUBLED)
+
+int max9485_set(struct i2c_client *max9485, u8 value);
+
+#endif /*  __LINUX_I2C_MAX9485_H */


_______________________________________________
i2c mailing list
i2c-GZX6beZjE8VD60Wz+7aTrA@public.gmane.org
http://lists.lm-sensors.org/mailman/listinfo/i2c

^ permalink raw reply related	[flat|nested] only message in thread
only message in thread, other threads:[~2008-10-22  1:22 UTC | newest]

Thread overview: (only message) (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2008-10-22  1:22 [V2 PATCH] i2c driver for Maxim max9485 audio clock generator chip Jon Smirl

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.