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103 lines
2.5 KiB
103 lines
2.5 KiB
/* |
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* dac7512.c - Linux kernel module for |
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* Texas Instruments DAC7512 |
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* |
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* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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#include <linux/module.h> |
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#include <linux/spi/spi.h> |
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#include <linux/of.h> |
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static ssize_t dac7512_store_val(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct spi_device *spi = to_spi_device(dev); |
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unsigned char tmp[2]; |
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unsigned long val; |
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int ret; |
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ret = kstrtoul(buf, 10, &val); |
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if (ret) |
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return ret; |
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tmp[0] = val >> 8; |
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tmp[1] = val & 0xff; |
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spi_write(spi, tmp, sizeof(tmp)); |
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return count; |
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} |
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static DEVICE_ATTR(value, S_IWUSR, NULL, dac7512_store_val); |
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static struct attribute *dac7512_attributes[] = { |
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&dev_attr_value.attr, |
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NULL |
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}; |
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static const struct attribute_group dac7512_attr_group = { |
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.attrs = dac7512_attributes, |
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}; |
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static int dac7512_probe(struct spi_device *spi) |
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{ |
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int ret; |
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spi->bits_per_word = 8; |
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spi->mode = SPI_MODE_0; |
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ret = spi_setup(spi); |
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if (ret < 0) |
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return ret; |
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return sysfs_create_group(&spi->dev.kobj, &dac7512_attr_group); |
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} |
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static int dac7512_remove(struct spi_device *spi) |
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{ |
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sysfs_remove_group(&spi->dev.kobj, &dac7512_attr_group); |
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return 0; |
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} |
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static const struct spi_device_id dac7512_id_table[] = { |
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{ "dac7512", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(spi, dac7512_id_table); |
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#ifdef CONFIG_OF |
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static const struct of_device_id dac7512_of_match[] = { |
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{ .compatible = "ti,dac7512", }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, dac7512_of_match); |
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#endif |
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static struct spi_driver dac7512_driver = { |
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.driver = { |
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.name = "dac7512", |
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.of_match_table = of_match_ptr(dac7512_of_match), |
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}, |
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.probe = dac7512_probe, |
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.remove = dac7512_remove, |
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.id_table = dac7512_id_table, |
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}; |
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module_spi_driver(dac7512_driver); |
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MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>"); |
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MODULE_DESCRIPTION("DAC7512 16-bit DAC"); |
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MODULE_LICENSE("GPL v2");
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