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Subject[PATCH 3/5] iio: Add support for LMP92001 DAC
Date
From: Abhisit Sangjan <s.abhisit@gmail.com>

---
drivers/iio/dac/Kconfig | 9 ++
drivers/iio/dac/Makefile | 1 +
drivers/iio/dac/lmp92001-dac.c | 350 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 360 insertions(+)
create mode 100644 drivers/iio/dac/lmp92001-dac.c

diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
index 25bed2d..69d4ad3 100644
--- a/drivers/iio/dac/Kconfig
+++ b/drivers/iio/dac/Kconfig
@@ -310,4 +310,13 @@ config VF610_DAC
This driver can also be built as a module. If so, the module will
be called vf610_dac.

+config LMP92001_DAC
+ tristate "TI LMP92001 DAC Driver"
+ depends on MFD_LMP92001
+ help
+ If you say yes here you get support for TI LMP92001 DACs.
+
+ This driver can also be built as a module. If so, the module will
+ be called lmp92001_dac.
+
endmenu
diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile
index 603587c..82395b6 100644
--- a/drivers/iio/dac/Makefile
+++ b/drivers/iio/dac/Makefile
@@ -33,3 +33,4 @@ obj-$(CONFIG_MCP4922) += mcp4922.o
obj-$(CONFIG_STM32_DAC_CORE) += stm32-dac-core.o
obj-$(CONFIG_STM32_DAC) += stm32-dac.o
obj-$(CONFIG_VF610_DAC) += vf610_dac.o
+obj-$(CONFIG_LMP92001_DAC) += lmp92001-dac.o
diff --git a/drivers/iio/dac/lmp92001-dac.c b/drivers/iio/dac/lmp92001-dac.c
new file mode 100644
index 0000000..9ed4183
--- /dev/null
+++ b/drivers/iio/dac/lmp92001-dac.c
@@ -0,0 +1,350 @@
+/*
+ * lmp92001-dac.c - Support for TI LMP92001 DACs
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@gmail.com>
+ *
+ * Inspired by wm831x driver.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/iio/iio.h>
+#include <linux/mfd/core.h>
+#include <linux/platform_device.h>
+
+#include <linux/mfd/lmp92001/core.h>
+
+static int lmp92001_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *channel, int *val,
+ int *val2, long mask)
+{
+ struct lmp92001 *lmp92001 = iio_device_get_drvdata(indio_dev);
+ int ret;
+
+ switch (mask)
+ {
+ case IIO_CHAN_INFO_RAW:
+ switch (channel->type) {
+ case IIO_VOLTAGE:
+ ret = regmap_read(lmp92001->regmap,
+ 0x7F + channel->channel, val);
+ if (ret < 0)
+ return ret;
+
+ return IIO_VAL_INT;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return -EINVAL;
+}
+
+int lmp92001_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *channel,
+ int val, int val2, long mask)
+{
+ struct lmp92001 *lmp92001 = iio_device_get_drvdata(indio_dev);
+ int ret;
+
+ if (val > 4095)
+ return -EINVAL;
+
+ switch (mask)
+ {
+ case IIO_CHAN_INFO_RAW:
+ switch (channel->type) {
+ case IIO_VOLTAGE:
+ ret = regmap_write(lmp92001->regmap,
+ 0x7F + channel->channel, val);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return -EINVAL;
+}
+
+static const struct iio_info lmp92001_info = {
+ .read_raw = lmp92001_read_raw,
+ .write_raw = lmp92001_write_raw,
+ .driver_module = THIS_MODULE,
+};
+
+ssize_t lmp92001_dvref_read(struct iio_dev *indio_dev, uintptr_t private,
+ struct iio_chan_spec const *channel, char *buf)
+{
+ struct lmp92001 *lmp92001 = iio_device_get_drvdata(indio_dev);
+ unsigned int cref;
+ int ret;
+
+ ret = regmap_read(lmp92001->regmap, LMP92001_CREF, &cref);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%s\n", cref & 1 ? "external" : "internal");
+}
+
+ssize_t lmp92001_dvref_write(struct iio_dev *indio_dev, uintptr_t private,
+ struct iio_chan_spec const *channel, const char *buf,
+ size_t len)
+{
+ struct lmp92001 *lmp92001 = iio_device_get_drvdata(indio_dev);
+ unsigned int cref;
+ int ret;
+
+ if (strcmp("external\n", buf) == 0)
+ cref = 1;
+ else if (strcmp("internal\n", buf) == 0)
+ cref = 0;
+ else
+ return -EINVAL;
+
+ ret = regmap_update_bits(lmp92001->regmap, LMP92001_CREF, 1, cref);
+ if (ret < 0)
+ return ret;
+
+ return len;
+}
+
+ssize_t lmp92001_outx_read(struct iio_dev *indio_dev, uintptr_t private,
+ struct iio_chan_spec const *channel, char *buf)
+{
+ struct lmp92001 *lmp92001 = iio_device_get_drvdata(indio_dev);
+ unsigned int cdac;
+ const char *outx;
+ int ret;
+
+ ret = regmap_read(lmp92001->regmap, LMP92001_CDAC, &cdac);
+ if (ret < 0)
+ return ret;
+
+ if (cdac & 1)
+ outx = "hiz";
+ else
+ {
+ if (cdac & 2)
+ outx = "1 or dac";
+ else
+ outx = "0 or dac";
+ }
+
+ return sprintf(buf, "%s\n", outx);
+}
+
+ssize_t lmp92001_outx_write(struct iio_dev *indio_dev, uintptr_t private,
+ struct iio_chan_spec const *channel, const char *buf,
+ size_t len)
+{
+ struct lmp92001 *lmp92001 = iio_device_get_drvdata(indio_dev);
+ unsigned int cdac, mask;
+ int ret;
+
+ if (strcmp("hiz\n", buf) == 0)
+ {
+ cdac = 1;
+ mask = 1;
+ }
+ else if (strcmp("dac\n", buf) == 0)
+ {
+ cdac = 0;
+ mask = 1;
+ }
+ else if (strcmp("0\n", buf) == 0)
+ {
+ cdac = 0;
+ mask = 3;
+ }
+ else if (strcmp("1\n", buf) == 0)
+ {
+ cdac = 2;
+ mask = 3;
+ }
+ else
+ return -EINVAL;
+
+ ret = regmap_update_bits(lmp92001->regmap, LMP92001_CDAC, mask, cdac);
+ if (ret < 0)
+ return ret;
+
+ return len;
+}
+
+ssize_t lmp92001_gang_read(struct iio_dev *indio_dev, uintptr_t private,
+ struct iio_chan_spec const *channel, char *buf)
+{
+ struct lmp92001 *lmp92001 = iio_device_get_drvdata(indio_dev);
+ unsigned int cdac;
+ int ret;
+
+ ret = regmap_read(lmp92001->regmap, LMP92001_CDAC, &cdac);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%s\n", cdac & 4 ? "1" : "0");
+}
+
+ssize_t lmp92001_gang_write(struct iio_dev *indio_dev, uintptr_t private,
+ struct iio_chan_spec const *channel, const char *buf,
+ size_t len)
+{
+ struct lmp92001 *lmp92001 = iio_device_get_drvdata(indio_dev);
+ unsigned int cdac = 0;
+ int ret;
+
+ if (strcmp("0\n", buf) == 0)
+ cdac = 0;
+ else if (strcmp("1\n", buf) == 0)
+ cdac = 4;
+ else
+ return -EINVAL;
+
+ ret = regmap_update_bits(lmp92001->regmap, LMP92001_CDAC, 4, cdac);
+ if (ret < 0)
+ return ret;
+
+ return len;
+}
+
+static const struct iio_chan_spec_ext_info lmp92001_ext_info[] = {
+ {
+ .name = "vref",
+ .read = lmp92001_dvref_read,
+ .write = lmp92001_dvref_write,
+ .shared = IIO_SHARED_BY_ALL,
+ },
+ {
+ .name = "outx",
+ .read = lmp92001_outx_read,
+ .write = lmp92001_outx_write,
+ .shared = IIO_SHARED_BY_ALL,
+ },
+ {
+ .name = "gang",
+ .read = lmp92001_gang_read,
+ .write = lmp92001_gang_write,
+ .shared = IIO_SHARED_BY_ALL,
+ },
+ { },
+};
+
+#define LMP92001_CHAN_SPEC(_ch) \
+{ \
+ .channel = _ch, \
+ .scan_index = _ch, \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .ext_info = lmp92001_ext_info, \
+ .output = 1, \
+}
+
+static const struct iio_chan_spec lmp92001_dac_channels[] = {
+ LMP92001_CHAN_SPEC(1),
+ LMP92001_CHAN_SPEC(2),
+ LMP92001_CHAN_SPEC(3),
+ LMP92001_CHAN_SPEC(4),
+ LMP92001_CHAN_SPEC(5),
+ LMP92001_CHAN_SPEC(6),
+ LMP92001_CHAN_SPEC(7),
+ LMP92001_CHAN_SPEC(8),
+ LMP92001_CHAN_SPEC(9),
+ LMP92001_CHAN_SPEC(10),
+ LMP92001_CHAN_SPEC(11),
+ LMP92001_CHAN_SPEC(12),
+};
+
+static int lmp92001_dac_probe(struct platform_device *pdev)
+{
+ struct lmp92001 *lmp92001 = dev_get_drvdata(pdev->dev.parent);
+ struct iio_dev *indio_dev;
+ struct device_node *np = pdev->dev.of_node;
+ u8 gang = 0, outx = 0, hiz = 0;
+ unsigned int cdac = 0;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*lmp92001));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ iio_device_set_drvdata(indio_dev, lmp92001);
+
+ indio_dev->name = pdev->name;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->info = &lmp92001_info;
+ indio_dev->channels = lmp92001_dac_channels;
+ indio_dev->num_channels = ARRAY_SIZE(lmp92001_dac_channels);
+
+ of_property_read_u8(np, "ti,lmp92001-dac-hiz", &hiz);
+ cdac |= hiz;
+
+ of_property_read_u8(np, "ti,lmp92001-dac-outx", &outx);
+ cdac |= outx << 1;
+
+ of_property_read_u8(np, "ti,lmp92001-dac-gang", &gang);
+ cdac |= gang << 2;
+
+ ret = regmap_update_bits(lmp92001->regmap, LMP92001_CDAC, 7, cdac);
+ if (ret < 0)
+ return ret;
+
+ platform_set_drvdata(pdev, indio_dev);
+
+ return iio_device_register(indio_dev);
+}
+
+static int lmp92001_dac_remove(struct platform_device *pdev)
+{
+ struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+
+ iio_device_unregister(indio_dev);
+
+ return 0;
+}
+
+static struct platform_driver lmp92001_dac_driver = {
+ .driver.name = "lmp92001-dac",
+ .driver.owner = THIS_MODULE,
+ .probe = lmp92001_dac_probe,
+ .remove = lmp92001_dac_remove,
+};
+
+static int __init lmp92001_dac_init(void)
+{
+ return platform_driver_register(&lmp92001_dac_driver);
+}
+subsys_initcall(lmp92001_dac_init);
+
+static void __exit lmp92001_dac_exit(void)
+{
+ platform_driver_unregister(&lmp92001_dac_driver);
+}
+module_exit(lmp92001_dac_exit);
+
+MODULE_AUTHOR("Abhisit Sangjan <s.abhisit@gmail.com>");
+MODULE_DESCRIPTION("IIO DAC interface for TI LMP92001");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lmp92001-dac");
--
2.7.4
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