drivers/misc: add driver for Texas Instruments DAC7512
Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: "H Hartley Sweeten" <hartleys@visionengravers.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/misc/ti_dac7512.c b/drivers/misc/ti_dac7512.c
new file mode 100644
index 0000000..d3f229a
--- /dev/null
+++ b/drivers/misc/ti_dac7512.c
@@ -0,0 +1,101 @@
+/*
+ * dac7512.c - Linux kernel module for
+ * Texas Instruments DAC7512
+ *
+ * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/spi/spi.h>
+
+#define DAC7512_DRV_NAME "dac7512"
+#define DRIVER_VERSION "1.0"
+
+static ssize_t dac7512_store_val(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ unsigned char tmp[2];
+ unsigned long val;
+
+ if (strict_strtoul(buf, 10, &val) < 0)
+ return -EINVAL;
+
+ tmp[0] = val >> 8;
+ tmp[1] = val & 0xff;
+ spi_write(spi, tmp, sizeof(tmp));
+ return count;
+}
+
+static DEVICE_ATTR(value, S_IWUSR, NULL, dac7512_store_val);
+
+static struct attribute *dac7512_attributes[] = {
+ &dev_attr_value.attr,
+ NULL
+};
+
+static const struct attribute_group dac7512_attr_group = {
+ .attrs = dac7512_attributes,
+};
+
+static int __devinit dac7512_probe(struct spi_device *spi)
+{
+ int ret;
+
+ spi->bits_per_word = 8;
+ spi->mode = SPI_MODE_0;
+ ret = spi_setup(spi);
+ if (ret < 0)
+ return ret;
+
+ return sysfs_create_group(&spi->dev.kobj, &dac7512_attr_group);
+}
+
+static int __devexit dac7512_remove(struct spi_device *spi)
+{
+ sysfs_remove_group(&spi->dev.kobj, &dac7512_attr_group);
+ return 0;
+}
+
+static struct spi_driver dac7512_driver = {
+ .driver = {
+ .name = DAC7512_DRV_NAME,
+ .owner = THIS_MODULE,
+ },
+ .probe = dac7512_probe,
+ .remove = __devexit_p(dac7512_remove),
+};
+
+static int __init dac7512_init(void)
+{
+ return spi_register_driver(&dac7512_driver);
+}
+
+static void __exit dac7512_exit(void)
+{
+ spi_unregister_driver(&dac7512_driver);
+}
+
+MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
+MODULE_DESCRIPTION("DAC7512 16-bit DAC");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION(DRIVER_VERSION);
+
+module_init(dac7512_init);
+module_exit(dac7512_exit);