Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / misc / ti_dac7512.c

diff --git a/kernel/drivers/misc/ti_dac7512.c b/kernel/drivers/misc/ti_dac7512.c
new file mode 100644 (file)
index 0000000..cb0289b
--- /dev/null
+++ b/kernel/drivers/misc/ti_dac7512.c
@@ -0,0 +1,104 @@
+/*
+ *  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/spi/spi.h>
+#include <linux/of.h>
+
+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;
+       int ret;
+
+       ret = kstrtoul(buf, 10, &val);
+       if (ret)
+               return ret;
+
+       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 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 dac7512_remove(struct spi_device *spi)
+{
+       sysfs_remove_group(&spi->dev.kobj, &dac7512_attr_group);
+       return 0;
+}
+
+static const struct spi_device_id dac7512_id_table[] = {
+       { "dac7512", 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(spi, dac7512_id_table);
+
+#ifdef CONFIG_OF
+static const struct of_device_id dac7512_of_match[] = {
+       { .compatible = "ti,dac7512", },
+       { }
+};
+MODULE_DEVICE_TABLE(of, dac7512_of_match);
+#endif
+
+static struct spi_driver dac7512_driver = {
+       .driver = {
+               .name   = "dac7512",
+               .owner  = THIS_MODULE,
+               .of_match_table = of_match_ptr(dac7512_of_match),
+       },
+       .probe  = dac7512_probe,
+       .remove = dac7512_remove,
+       .id_table = dac7512_id_table,
+};
+
+module_spi_driver(dac7512_driver);
+
+MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
+MODULE_DESCRIPTION("DAC7512 16-bit DAC");
+MODULE_LICENSE("GPL v2");