From: Abhisit Sangjan <[email protected]> TI LMP92001 Analog System Monitor and Controller
8-bit GPIOs. 12 DACs with 12-bit resolution. The GPIOs and DACs are shared port function with Cy function pin to take control the pin suddenly from external hardware. DAC's referance voltage selectable for Internal/External. 16 + 1 ADCs with 12-bit resolution. Built-in internal Temperature Sensor on channel 17. Window Comparator Function is supported on channel 1-3 and 9-11 for monitoring with interrupt signal (pending to implement for interrupt). ADC's referance voltage selectable for Internal/External. Signed-off-by: Abhisit Sangjan <[email protected]> --- drivers/iio/dac/Kconfig | 9 ++ drivers/iio/dac/Makefile | 1 + drivers/iio/dac/lmp92001-dac.c | 337 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 347 insertions(+) create mode 100644 drivers/iio/dac/lmp92001-dac.c diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig index 25bed2d7d2b9..3e0d81606927 100644 --- a/drivers/iio/dac/Kconfig +++ b/drivers/iio/dac/Kconfig @@ -221,6 +221,15 @@ config DPOT_DAC To compile this driver as a module, choose M here: the module will be called dpot-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. + config LPC18XX_DAC tristate "NXP LPC18xx DAC driver" depends on ARCH_LPC18XX || COMPILE_TEST diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile index 603587cc2f07..516d2beced7b 100644 --- a/drivers/iio/dac/Makefile +++ b/drivers/iio/dac/Makefile @@ -23,6 +23,7 @@ obj-$(CONFIG_AD7303) += ad7303.o obj-$(CONFIG_AD8801) += ad8801.o obj-$(CONFIG_CIO_DAC) += cio-dac.o obj-$(CONFIG_DPOT_DAC) += dpot-dac.o +obj-$(CONFIG_LMP92001_DAC) += lmp92001-dac.o obj-$(CONFIG_LPC18XX_DAC) += lpc18xx_dac.o obj-$(CONFIG_LTC2632) += ltc2632.o obj-$(CONFIG_M62332) += m62332.o diff --git a/drivers/iio/dac/lmp92001-dac.c b/drivers/iio/dac/lmp92001-dac.c new file mode 100644 index 000000000000..072026e9895c --- /dev/null +++ b/drivers/iio/dac/lmp92001-dac.c @@ -0,0 +1,337 @@ +/* + * lmp92001-dac.c - Support for TI LMP92001 DACs + * + * Copyright 2016-2017 Celestica Ltd. + * + * Author: Abhisit Sangjan <[email protected]> + * + * 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/iio/iio.h> +#include <linux/kernel.h> +#include <linux/mfd/core.h> +#include <linux/module.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: + mutex_lock(&lmp92001->dac_lock); + + ret = regmap_read(lmp92001->regmap, + 0x7F + channel->channel, val); + + mutex_unlock(&lmp92001->dac_lock); + + if (ret < 0) + return ret; + + return IIO_VAL_INT; + default: + return -EINVAL; + } + break; + default: + return -EINVAL; + } +} + +static 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 < 0 || val > 4095) + return -EINVAL; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + switch (channel->type) { + case IIO_VOLTAGE: + mutex_lock(&lmp92001->dac_lock); + + ret = regmap_write(lmp92001->regmap, + 0x7F + channel->channel, val); + + mutex_unlock(&lmp92001->dac_lock); + + if (ret < 0) + return ret; + + return 0; + default: + return -EINVAL; + } + break; + default: + return -EINVAL; + } +} + +static const struct iio_info lmp92001_info = { + .read_raw = lmp92001_read_raw, + .write_raw = lmp92001_write_raw, + .driver_module = THIS_MODULE, +}; + +static 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 & CREF_DEXT ? "external" : "internal"); +} + +static 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 (strncmp("external", buf, 8) == 0) + cref = 1; + else if (strncmp("internal", buf, 8) == 0) + cref = 0; + else + return -EINVAL; + + ret = regmap_update_bits(lmp92001->regmap, LMP92001_CREF, CREF_DEXT, + cref); + if (ret < 0) + return ret; + + return len; +} + +static 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 & CDAC_OFF) + outx = "hiz"; + else { + if (cdac & CDAC_OLVL) + outx = "1 or dac"; + else + outx = "0 or dac"; + } + + return sprintf(buf, "%s\n", outx); +} + +static 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 (strncmp("hiz", buf, 3) == 0) { + cdac = CDAC_OFF; + mask = CDAC_OFF; + } else if (strncmp("dac", buf, 3) == 0) { + cdac = ~CDAC_OFF; + mask = CDAC_OFF; + } else if (strncmp("0", buf, 1) == 0) { + cdac = ~(CDAC_OLVL | CDAC_OFF); + mask = CDAC_OLVL | CDAC_OFF; + } else if (strncmp("1", buf, 1) == 0) { + cdac = CDAC_OLVL; + mask = CDAC_OLVL | CDAC_OFF; + } else + return -EINVAL; + + ret = regmap_update_bits(lmp92001->regmap, LMP92001_CDAC, mask, cdac); + if (ret < 0) + return ret; + + return len; +} + +static 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 & CDAC_GANG ? "1" : "0"); +} + +static 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 (strncmp("0", buf, 1) == 0) + cdac = ~CDAC_GANG; + else if (strncmp("1", buf, 1) == 0) + cdac = CDAC_GANG; + else + return -EINVAL; + + ret = regmap_update_bits(lmp92001->regmap, LMP92001_CDAC, CDAC_GANG, + 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, \ + .type = IIO_VOLTAGE, \ + .indexed = 1, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_SCALE), \ + .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, 0); + if (!indio_dev) + return -ENOMEM; + + iio_device_set_drvdata(indio_dev, lmp92001); + + mutex_init(&lmp92001->dac_lock); + + 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, + CDAC_GANG | CDAC_OLVL | CDAC_OFF, cdac); + if (ret < 0) + return ret; + + return devm_iio_device_register(&pdev->dev, indio_dev); +} + +static int lmp92001_dac_remove(struct platform_device *pdev) +{ + return 0; +} + +static struct platform_driver lmp92001_dac_driver = { + .driver.name = "lmp92001-dac", + .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 <[email protected]>"); +MODULE_DESCRIPTION("IIO DAC interface for TI LMP92001"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:lmp92001-dac"); -- 2.13.0
