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Date: Tue, 22 Aug 2017 13:26:11 +0700
From: s.abhisit@...il.com
To: lee.jones@...aro.org, Jonathan.Cameron@...wei.com,
pmeerw@...erw.net, jacopo@...ndi.org, linus.walleij@...aro.org
Cc: linux-kernel@...r.kernel.org, knaack.h@....de, lars@...afoo.de,
fabrice.gasnier@...com, robh@...nel.org, akinobu.mita@...il.com,
marek.vasut+renesas@...il.com, jacopo+renesas@...ndi.org,
mike.looijmans@...ic.nl, peda@...ntia.se, jeff.dagenais@...il.com,
linux-iio@...r.kernel.org, linux-gpio@...r.kernel.org,
robh+dt@...nel.org, mark.rutland@....com,
devicetree@...r.kernel.org, Abhisit Sangjan <s.abhisit@...il.com>
Subject: [PATCH] mfd: Add support for TI LMP92001
From: Abhisit Sangjan <s.abhisit@...il.com>
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.
Windows 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 <s.abhisit@...il.com>
---
Documentation/ABI/testing/sysfs-bus-iio-lmp920001 | 92 ++++
.../devicetree/bindings/gpio/gpio-lmp92001.txt | 22 +
.../bindings/iio/adc/ti-lmp92001-adc.txt | 21 +
.../bindings/iio/dac/ti-lmp92001-dac.txt | 35 ++
drivers/gpio/Kconfig | 7 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-lmp92001.c | 209 +++++++++
drivers/iio/adc/Kconfig | 10 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/lmp92001-adc.c | 500 +++++++++++++++++++++
drivers/iio/dac/Kconfig | 9 +
drivers/iio/dac/Makefile | 1 +
drivers/iio/dac/lmp92001-dac.c | 390 ++++++++++++++++
drivers/mfd/Kconfig | 12 +
drivers/mfd/Makefile | 4 +
drivers/mfd/lmp92001-core.c | 308 +++++++++++++
drivers/mfd/lmp92001-debug.c | 67 +++
drivers/mfd/lmp92001-i2c.c | 215 +++++++++
include/linux/mfd/lmp92001/core.h | 119 +++++
include/linux/mfd/lmp92001/debug.h | 28 ++
20 files changed, 2051 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-lmp920001
create mode 100644 Documentation/devicetree/bindings/gpio/gpio-lmp92001.txt
create mode 100644 Documentation/devicetree/bindings/iio/adc/ti-lmp92001-adc.txt
create mode 100644 Documentation/devicetree/bindings/iio/dac/ti-lmp92001-dac.txt
create mode 100644 drivers/gpio/gpio-lmp92001.c
create mode 100644 drivers/iio/adc/lmp92001-adc.c
create mode 100644 drivers/iio/dac/lmp92001-dac.c
create mode 100644 drivers/mfd/lmp92001-core.c
create mode 100644 drivers/mfd/lmp92001-debug.c
create mode 100644 drivers/mfd/lmp92001-i2c.c
create mode 100644 include/linux/mfd/lmp92001/core.h
create mode 100644 include/linux/mfd/lmp92001/debug.h
diff --git a/Documentation/ABI/testing/sysfs-bus-iio-lmp920001 b/Documentation/ABI/testing/sysfs-bus-iio-lmp920001
new file mode 100644
index 0000000..bd4e733
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-lmp920001
@@ -0,0 +1,92 @@
+What: /sys/bus/iio/devices/iio:deviceX/gang
+Date: August 2016
+KernelVersion: 4.1.15
+Contact: Abhisit Sangjan <s.abhisit@...il.com>
+Description:
+ Controls the association of analog output channels OUTx with
+ asynchronous control inputs Cy for DAC.
+ Can be either:
+ - "0"
+ - "1"
+
+ Cy to OUTx Assignment
+ ----------------------------------
+ | Cy | CDAC:GANG=0 | CDAC:GANG=1 |
+ ----------------------------------
+ | C1 | OUT[1:4] | OUT[1:3] |
+ ----------------------------------
+ | C2 | OUT[5:6] | OUT[4:6] |
+ ----------------------------------
+ | C3 | OUT[7:8] | OUT[7:9] |
+ ----------------------------------
+ | C4 | OUT[9:12] | OUT[10:12] |
+ ----------------------------------
+
+What: /sys/bus/iio/devices/iio:deviceX/outx
+Date: August 2016
+KernelVersion: 4.1.15
+Contact: Abhisit Sangjan <s.abhisit@...il.com>
+Description:
+ The pin output mode for DAC.
+ Can be either:
+ - "hiz" = High impedance state.
+ - "dac" = DAC output.
+ - "0" = Drive it to low.
+ - "1" = Drive it to high.
+
+What: /sys/bus/iio/devices/iio:deviceX/vref
+Date: August 2016
+KernelVersion: 4.1.15
+Contact: Abhisit Sangjan <s.abhisit@...il.com>
+Description:
+ This is voltage referance source for DACs.
+ Can be either:
+ - "external"
+ - "internal"
+
+What: /sys/devices/socX/soc/XXXXXXX.aips-bus/XXXXXXX.i2c/i2c-X/X-00XX/lmp92001-adc.X.auto/iio:deviceX/en
+Date: August 2016
+KernelVersion: 4.1.15
+Contact: Abhisit Sangjan <s.abhisit@...il.com>
+Description:
+ This is ADC Conversion Enable for each channel.
+ Can be either:
+ - "enable"
+ - "disable"
+
+What: /sys/devices/socX/soc/XXXXXXX.aips-bus/XXXXXXX.i2c/i2c-X/X-00XX/lmp92001-adc.X.auto/iio:deviceX/mode
+Date: August 2016
+KernelVersion: 4.1.15
+Contact: Abhisit Sangjan <s.abhisit@...il.com>
+Description:
+ This is conversion mode for all of ADCs.
+ Can be either:
+ - "continuous" = Continuously conversion all the time.
+ - "single-shot" = Once time conversion and stop.
+
+What: /sys/devices/socX/soc/XXXXXXX.aips-bus/XXXXXXX.i2c/i2c-X/X-00XX/lmp92001-adc.X.auto/iio:deviceX/vref
+Date: August 2016
+KernelVersion: 4.1.15
+Contact: Abhisit Sangjan <s.abhisit@...il.com>
+Description:
+ This is voltage referance source for ADCs.
+ Can be either:
+ - "external"
+ - "internal"
+
+What: /sys/devices/socX/soc/XXXXXXX.aips-bus/XXXXXXX.i2c/i2c-X/X-00XX/lmp92001-adc.X.auto/iio:deviceX/events/in_voltageX_thresh_{falling|rising}_en
+Date: August 2016
+KernelVersion: 4.1.15
+Contact: Abhisit Sangjan <s.abhisit@...il.com>
+Description:
+ This is ADC's Windows Comparator Function enable for falling and rising.
+ Supported channels are 1-3 and 9-11.
+
+What: /sys/devices/socX/soc/XXXXXXX.aips-bus/XXXXXXX.i2c/i2c-X/X-00XX/lmp92001-adc.X.auto/iio:deviceX/events/in_voltageX_thresh_{falling|rising}_value
+Date: August 2016
+KernelVersion: 4.1.15
+Contact: Abhisit Sangjan <s.abhisit@...il.com>
+Description:
+ This is ADC's Windows Comparator Function value for falling and rising.
+ Supported channels are 1-3 and 9-11.
+ The possible range is 0 - 2047.
diff --git a/Documentation/devicetree/bindings/gpio/gpio-lmp92001.txt b/Documentation/devicetree/bindings/gpio/gpio-lmp92001.txt
new file mode 100644
index 0000000..c68784e
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-lmp92001.txt
@@ -0,0 +1,22 @@
+* Texas Instruments' LMP92001 GPIOs
+
+Required properties:
+ - compatible: Must be set to "ti,lmp92001-gpio".
+ - reg: i2c chip address for the device.
+ - gpio-controller: Marks the device node as a gpio controller.
+ - #gpio-cells : Should be two. The first cell is the pin number and the
+ second cell is used to specify the gpio polarity:
+ 0 = Active high
+ 1 = Active low
+
+Example:
+lmp92001@20 {
+ compatible = "ti,lmp92001";
+ reg = <0x20>;
+
+ lmp92001_gpio: lmp92001-gpio {
+ compatible = "ti,lmp92001-gpio";
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+};
diff --git a/Documentation/devicetree/bindings/iio/adc/ti-lmp92001-adc.txt b/Documentation/devicetree/bindings/iio/adc/ti-lmp92001-adc.txt
new file mode 100644
index 0000000..34d7809
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/ti-lmp92001-adc.txt
@@ -0,0 +1,21 @@
+* Texas Instruments' LMP92001 ADCs
+
+Required properties:
+ - compatible: Must be set to "ti,lmp92001-adc".
+ - reg: i2c chip address for the device.
+ - ti,lmp92001-adc-mode: adc operation, either continuous or single-shot.
+ - ti,lmp92001-adc-mask: bit mask for which channel is enable.
+ 0 = Off
+ 1 = On
+
+Example:
+lmp92001@20 {
+ compatible = "ti,lmp92001";
+ reg = <0x20>;
+
+ lmp92001-adc {
+ compatible = "ti,lmp92001-adc";
+ ti,lmp92001-adc-mode = "continuous";
+ ti,lmp92001-adc-mask = <0x00000079>;
+ };
+};
\ No newline at end of file
diff --git a/Documentation/devicetree/bindings/iio/dac/ti-lmp92001-dac.txt b/Documentation/devicetree/bindings/iio/dac/ti-lmp92001-dac.txt
new file mode 100644
index 0000000..882db9c
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/dac/ti-lmp92001-dac.txt
@@ -0,0 +1,35 @@
+* Texas Instruments' LMP92001 DACs
+
+Required properties:
+ - compatible: Must be set to "ti,lmp92001-dac".
+ - reg: i2c chip address for the device.
+ - ti,lmp92001-dac-hiz: hi-impedance control,
+ 1 = Forces all OUT[1:12] outputs to hi-z, 0 = normal
+ - ti,lmp92001-dac-outx:
+ Cy = 0, 1 = will force associated OUTx outputs to VDD
+ Cy = 0, 0 = will force associated OUTx outputs to GND
+ - ti,lmp92001-dac-gang: What group of Cy is governed to.
+ -----------------------------------------
+ | Cy | CDAC:GANG = 0 | CDAC:GANG = 1 |
+ -----------------------------------------
+ | C1 | OUT[1:4] | OUT[1:3] |
+ -----------------------------------------
+ | C2 | OUT[5:6] | OUT[4:6] |
+ -----------------------------------------
+ | C3 | OUT[7:8] | OUT[7:9] |
+ -----------------------------------------
+ | C4 | OUT[9:12] | OUT[10:12] |
+ -----------------------------------------
+
+Example:
+lmp92001@20 {
+ compatible = "ti,lmp92001";
+ reg = <0x20>;
+
+ lmp92001-dac {
+ compatible = "ti,lmp92001-dac";
+ ti,lmp92001-dac-hiz = /bits/ 8 <0>;
+ ti,lmp92001-dac-outx = /bits/ 8 <0>;
+ ti,lmp92001-dac-gang = /bits/ 8 <0>;
+ };
+};
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 461d6fc..5962ea0 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -948,6 +948,13 @@ config GPIO_KEMPLD
This driver can also be built as a module. If so, the module will be
called gpio-kempld.
+config GPIO_LMP92001
+ tristate "LMP92001 GPIOs"
+ depends on MFD_LMP92001
+ help
+ Say yes here to access the GPIO signals of TI LMP92001 Analog System
+ Monitor and Controller.
+
config GPIO_LP3943
tristate "TI/National Semiconductor LP3943 GPIO expander"
depends on MFD_LP3943
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index a9fda6c..560d59c 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -62,6 +62,7 @@ obj-$(CONFIG_GPIO_JANZ_TTL) += gpio-janz-ttl.o
obj-$(CONFIG_GPIO_KEMPLD) += gpio-kempld.o
obj-$(CONFIG_ARCH_KS8695) += gpio-ks8695.o
obj-$(CONFIG_GPIO_INTEL_MID) += gpio-intel-mid.o
+obj-$(CONFIG_GPIO_LMP92001) += gpio-lmp92001.o
obj-$(CONFIG_GPIO_LOONGSON) += gpio-loongson.o
obj-$(CONFIG_GPIO_LP3943) += gpio-lp3943.o
obj-$(CONFIG_GPIO_LPC18XX) += gpio-lpc18xx.o
diff --git a/drivers/gpio/gpio-lmp92001.c b/drivers/gpio/gpio-lmp92001.c
new file mode 100644
index 0000000..b80ba4e
--- /dev/null
+++ b/drivers/gpio/gpio-lmp92001.c
@@ -0,0 +1,209 @@
+/*
+ * gpio-lmp92001.c - Support for TI LMP92001 GPIOs
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@...il.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/bitops.h>
+#include <linux/gpio/driver.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include <linux/mfd/lmp92001/core.h>
+
+#define SGEN_GPI (1 << 0) /* 1 - if any bit in SGPI is set. */
+
+struct lmp92001_gpio {
+ struct lmp92001 *lmp92001;
+ struct gpio_chip gpio_chip;
+};
+
+static int lmp92001_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
+{
+ struct lmp92001_gpio *lmp92001_gpio = gpiochip_get_data(chip);
+ struct lmp92001 *lmp92001 = lmp92001_gpio->lmp92001;
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(lmp92001->regmap, LMP92001_CGPO, &val);
+ if (ret < 0)
+ return ret;
+
+ return (val >> offset) & BIT(0);
+}
+
+static int lmp92001_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
+{
+ struct lmp92001_gpio *lmp92001_gpio = gpiochip_get_data(chip);
+ struct lmp92001 *lmp92001 = lmp92001_gpio->lmp92001;
+
+ return regmap_update_bits(lmp92001->regmap, LMP92001_CGPO, BIT(offset),
+ BIT(offset));
+}
+
+static int lmp92001_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct lmp92001_gpio *lmp92001_gpio = gpiochip_get_data(chip);
+ struct lmp92001 *lmp92001 = lmp92001_gpio->lmp92001;
+ unsigned int val, sgen;
+
+ /*
+ * Does the GPIO input mode?
+ * Does the GPIO was set?
+ * Reading indicated logic level.
+ * Clear indicated logic level.
+ */
+ regmap_read(lmp92001->regmap, LMP92001_CGPO, &val);
+ if ((val >> offset) & BIT(0)) {
+ regmap_read(lmp92001->regmap, LMP92001_SGEN, &sgen);
+ if (sgen & SGEN_GPI) {
+ regmap_read(lmp92001->regmap, LMP92001_SGPI, &val);
+ regmap_update_bits(lmp92001->regmap, LMP92001_CGPO,
+ 0xFF, val);
+ }
+ }
+
+ return !!(val & BIT(offset));
+}
+
+static int lmp92001_gpio_direction_out(struct gpio_chip *chip, unsigned offset,
+ int value)
+{
+ struct lmp92001_gpio *lmp92001_gpio = gpiochip_get_data(chip);
+ struct lmp92001 *lmp92001 = lmp92001_gpio->lmp92001;
+
+ return regmap_update_bits(lmp92001->regmap, LMP92001_CGPO, BIT(offset),
+ 0 << offset);
+}
+
+static void lmp92001_gpio_set(struct gpio_chip *chip, unsigned offset,
+ int value)
+{
+ struct lmp92001_gpio *lmp92001_gpio = gpiochip_get_data(chip);
+ struct lmp92001 *lmp92001 = lmp92001_gpio->lmp92001;
+
+ regmap_update_bits(lmp92001->regmap, LMP92001_CGPO, BIT(offset),
+ value << offset);
+}
+
+#ifdef CONFIG_DEBUG_FS
+static void lmp92001_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
+{
+ struct lmp92001_gpio *lmp92001_gpio = gpiochip_get_data(chip);
+ struct lmp92001 *lmp92001 = lmp92001_gpio->lmp92001;
+ int i, gpio;
+ unsigned int cgpo;
+ const char *label, *dir, *logic;
+
+ for (i = 0; i < chip->ngpio; i++) {
+ gpio = i + chip->base;
+
+ label = gpiochip_is_requested(chip, i);
+ if (!label)
+ continue;
+
+ regmap_read(lmp92001->regmap, LMP92001_CGPO, &cgpo);
+ if ((cgpo>>i) & BIT(0))
+ dir = "in";
+ else
+ dir = "out";
+
+ if (lmp92001_gpio_get(chip, i))
+ logic = "hi";
+ else
+ logic = "lo";
+
+ seq_printf(s, " gpio-%-3d (%-20.20s) %-3.3s %-2.2s\n",
+ gpio, label, dir, logic);
+ }
+}
+#else
+#define lmp92001_gpio_dbg_show NULL
+#endif
+
+static struct gpio_chip lmp92001_gpio_chip = {
+ .label = "lmp92001",
+ .owner = THIS_MODULE,
+ .get_direction = lmp92001_gpio_get_direction,
+ .direction_input = lmp92001_gpio_direction_in,
+ .get = lmp92001_gpio_get,
+ .direction_output = lmp92001_gpio_direction_out,
+ .set = lmp92001_gpio_set,
+ .dbg_show = lmp92001_gpio_dbg_show,
+};
+
+static int lmp92001_gpio_probe(struct platform_device *pdev)
+{
+ struct lmp92001 *lmp92001 = dev_get_drvdata(pdev->dev.parent);
+ struct lmp92001_gpio *lmp92001_gpio;
+ int ret;
+
+ lmp92001_gpio = devm_kzalloc(&pdev->dev, sizeof(*lmp92001_gpio),
+ GFP_KERNEL);
+ if (!lmp92001_gpio)
+ return -ENOMEM;
+
+ lmp92001_gpio->lmp92001 = lmp92001;
+ lmp92001_gpio->gpio_chip = lmp92001_gpio_chip;
+ lmp92001_gpio->gpio_chip.ngpio = 8;
+ lmp92001_gpio->gpio_chip.parent = &pdev->dev;
+ lmp92001_gpio->gpio_chip.base = -1;
+
+ ret = devm_gpiochip_add_data(&pdev->dev, &lmp92001_gpio->gpio_chip,
+ lmp92001_gpio);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, lmp92001_gpio);
+
+ return ret;
+}
+
+static int lmp92001_gpio_remove(struct platform_device *pdev)
+{
+ struct lmp92001_gpio *lmp92001_gpio = platform_get_drvdata(pdev);
+
+ devm_gpiochip_remove(&pdev->dev, &lmp92001_gpio->gpio_chip);
+
+ return 0;
+}
+
+static struct platform_driver lmp92001_gpio_driver = {
+ .driver.name = "lmp92001-gpio",
+ .probe = lmp92001_gpio_probe,
+ .remove = lmp92001_gpio_remove,
+};
+
+static int __init lmp92001_gpio_init(void)
+{
+ return platform_driver_register(&lmp92001_gpio_driver);
+}
+subsys_initcall(lmp92001_gpio_init);
+
+static void __exit lmp92001_gpio_exit(void)
+{
+ platform_driver_unregister(&lmp92001_gpio_driver);
+}
+module_exit(lmp92001_gpio_exit);
+
+MODULE_AUTHOR("Abhisit Sangjan <s.abhisit@...il.com>");
+MODULE_DESCRIPTION("GPIO interface for TI LMP92001");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lmp92001-gpio");
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 614fa41..2adeba5 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -331,6 +331,16 @@ config IMX7D_ADC
This driver can also be built as a module. If so, the module will be
called imx7d_adc.
+config LMP92001_ADC
+ tristate "TI LMP92001 ADC Driver"
+ depends on MFD_LMP92001
+ help
+ If you say yes here you get support for TI LMP92001 ADCs
+ conversion.
+
+ This driver can also be built as a module. If so, the module will
+ be called lmp92001_adc.
+
config LP8788_ADC
tristate "LP8788 ADC driver"
depends on MFD_LP8788
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index b546736a..2ed8986 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_HI8435) += hi8435.o
obj-$(CONFIG_HX711) += hx711.o
obj-$(CONFIG_IMX7D_ADC) += imx7d_adc.o
obj-$(CONFIG_INA2XX_ADC) += ina2xx-adc.o
+obj-$(CONFIG_LMP92001_ADC) += lmp92001-adc.o
obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
obj-$(CONFIG_LPC18XX_ADC) += lpc18xx_adc.o
obj-$(CONFIG_LPC32XX_ADC) += lpc32xx_adc.o
diff --git a/drivers/iio/adc/lmp92001-adc.c b/drivers/iio/adc/lmp92001-adc.c
new file mode 100644
index 0000000..8e64b51
--- /dev/null
+++ b/drivers/iio/adc/lmp92001-adc.c
@@ -0,0 +1,500 @@
+/*
+ * lmp92001-adc.c - Support for TI LMP92001 ADCs
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@...il.com>
+ *
+ * Inspired by wm831x and ad5064 drivers.
+ *
+ * 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/interrupt.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>
+
+#define CGEN_STRT (1 << 0) /* Is continuous conversion all of ADCs? */
+#define CGEN_LCK (1 << 1) /* Is lock the HW register? */
+#define CGEN_RST (1 << 7) /* Reset all registers. */
+
+#define CREF_AEXT (1 << 1) /* 1 - ADC external reference.
+ * 0 - ADC internal reference.
+ */
+
+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);
+ unsigned int code, cgen, sgen, try;
+ int ret;
+
+ mutex_lock(&lmp92001->adc_lock);
+
+ ret = regmap_read(lmp92001->regmap, LMP92001_CGEN, &cgen);
+ if (ret < 0)
+ goto exit;
+
+ /*
+ * Is not continuous conversion?
+ * Lock the HW registers (if needed).
+ * Triggering single-short conversion.
+ * Waiting for conversion successfully.
+ */
+ if (!(cgen & CGEN_STRT)) {
+ if (!(cgen & CGEN_LCK)) {
+ ret = regmap_update_bits(lmp92001->regmap,
+ LMP92001_CGEN, CGEN_LCK, CGEN_LCK);
+ if (ret < 0)
+ goto exit;
+ }
+
+ /* Writing any value to triggered Single-Shot conversion. */
+ ret = regmap_write(lmp92001->regmap, LMP92001_CTRIG, 1);
+ if (ret < 0)
+ goto exit;
+
+ /* In case of conversion is in-progress, repeat for 10 times. */
+ try = 10;
+ do {
+ ret = regmap_read(lmp92001->regmap,
+ LMP92001_SGEN, &sgen);
+ if (ret < 0)
+ goto exit;
+ } while ((sgen & CGEN_RST) && (--try > 0));
+
+ if (!try) {
+ ret = -ETIME;
+ goto exit;
+ }
+ }
+
+ ret = regmap_read(lmp92001->regmap, 0x1F + channel->channel, &code);
+ if (ret < 0)
+ goto exit;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ switch (channel->type) {
+ case IIO_VOLTAGE:
+ case IIO_TEMP:
+ *val = code;
+ ret = IIO_VAL_INT;
+ goto exit;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ /* In case of no match channel info/type is return here. */
+ ret = -EINVAL;
+
+exit:
+ mutex_unlock(&lmp92001->adc_lock);
+
+ return ret;
+}
+
+static const struct iio_info lmp92001_info = {
+ .read_raw = lmp92001_read_raw,
+ .driver_module = THIS_MODULE,
+};
+
+static ssize_t lmp92001_avref_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_AEXT ? "external" : "internal");
+}
+
+static ssize_t lmp92001_avref_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 = 2;
+ else if (strncmp("internal", buf, 8) == 0)
+ cref = 0;
+ else
+ return -EINVAL;
+
+ ret = regmap_update_bits(lmp92001->regmap, LMP92001_CREF, CREF_AEXT,
+ cref);
+ if (ret < 0)
+ return ret;
+
+ return len;
+}
+
+static ssize_t lmp92001_enable_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 reg, cad;
+ int ret;
+
+ switch (channel->channel) {
+ case 1 ... 8:
+ reg = LMP92001_CAD1;
+ break;
+ case 9 ... 16:
+ reg = LMP92001_CAD2;
+ break;
+ case 17:
+ reg = LMP92001_CAD3;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = regmap_read(lmp92001->regmap, reg, &cad);
+ if (ret < 0)
+ return ret;
+
+ if (channel->channel <= 8)
+ cad >>= channel->channel - 1;
+ else if (channel->channel > 8)
+ cad >>= channel->channel - 9;
+ else if (channel->channel > 16)
+ cad >>= channel->channel - 17;
+ else
+ return -EINVAL;
+
+ return sprintf(buf, "%s\n", cad & BIT(0) ? "enable" : "disable");
+}
+
+static ssize_t lmp92001_enable_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 reg, enable, shif, mask;
+ int ret;
+
+ switch (channel->channel) {
+ case 1 ... 8:
+ reg = LMP92001_CAD1;
+ shif = (channel->channel - 1);
+ break;
+ case 9 ... 16:
+ reg = LMP92001_CAD2;
+ shif = (channel->channel - 9);
+ break;
+ case 17:
+ reg = LMP92001_CAD3;
+ shif = (channel->channel - 17);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (strncmp("enable", buf, 6) == 0)
+ enable = 1;
+ else if (strncmp("disable", buf, 7) == 0)
+ enable = 0;
+ else
+ return -EINVAL;
+
+ enable <<= shif;
+ mask = 1 << shif;
+
+ ret = regmap_update_bits(lmp92001->regmap, reg, mask, enable);
+ if (ret < 0)
+ return ret;
+
+ return len;
+}
+
+static ssize_t lmp92001_mode_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 cgen;
+ int ret;
+
+ ret = regmap_read(lmp92001->regmap, LMP92001_CGEN, &cgen);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%s\n",
+ cgen & BIT(0) ? "continuous" : "single-shot");
+}
+
+static ssize_t lmp92001_mode_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 cgen;
+ int ret;
+
+ if (strncmp("continuous", buf, 10) == 0)
+ cgen = 1;
+ else if (strncmp("single-shot", buf, 11) == 0)
+ cgen = 0;
+ else
+ return -EINVAL;
+
+ /*
+ * Unlock the HW registers.
+ * Set conversion mode.
+ * Lock the HW registers.
+ */
+ ret = regmap_update_bits(lmp92001->regmap, LMP92001_CGEN, CGEN_LCK, 0);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_update_bits(lmp92001->regmap, LMP92001_CGEN, CGEN_STRT,
+ cgen);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_update_bits(lmp92001->regmap, LMP92001_CGEN, CGEN_LCK,
+ CGEN_LCK);
+ if (ret < 0)
+ return ret;
+
+ return len;
+}
+
+static const struct iio_chan_spec_ext_info lmp92001_ext_info[] = {
+ {
+ .name = "vref",
+ .read = lmp92001_avref_read,
+ .write = lmp92001_avref_write,
+ .shared = IIO_SHARED_BY_ALL,
+ },
+ {
+ .name = "en",
+ .read = lmp92001_enable_read,
+ .write = lmp92001_enable_write,
+ .shared = IIO_SEPARATE,
+ },
+ {
+ .name = "mode",
+ .read = lmp92001_mode_read,
+ .write = lmp92001_mode_write,
+ .shared = IIO_SHARED_BY_ALL,
+ },
+ { },
+};
+
+static const struct iio_event_spec lmp92001_events[] = {
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_RISING,
+ .mask_separate = BIT(IIO_EV_INFO_ENABLE) |
+ BIT(IIO_EV_INFO_VALUE),
+ },
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_FALLING,
+ .mask_separate = BIT(IIO_EV_INFO_ENABLE) |
+ BIT(IIO_EV_INFO_VALUE),
+ },
+ { },
+};
+
+#define LMP92001_CHAN_SPEC(_ch, _type, _event, _nevent) \
+{ \
+ .channel = _ch, \
+ .type = _type, \
+ .indexed = 1, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .event_spec = _event, \
+ .num_event_specs = _nevent, \
+ .ext_info = lmp92001_ext_info, \
+}
+
+static const struct iio_chan_spec lmp92001_adc_channels[] = {
+ LMP92001_CHAN_SPEC(1, IIO_VOLTAGE, lmp92001_events,
+ ARRAY_SIZE(lmp92001_events)),
+ LMP92001_CHAN_SPEC(2, IIO_VOLTAGE, lmp92001_events,
+ ARRAY_SIZE(lmp92001_events)),
+ LMP92001_CHAN_SPEC(3, IIO_VOLTAGE, lmp92001_events,
+ ARRAY_SIZE(lmp92001_events)),
+ LMP92001_CHAN_SPEC(4, IIO_VOLTAGE, NULL, 0),
+ LMP92001_CHAN_SPEC(5, IIO_VOLTAGE, NULL, 0),
+ LMP92001_CHAN_SPEC(6, IIO_VOLTAGE, NULL, 0),
+ LMP92001_CHAN_SPEC(7, IIO_VOLTAGE, NULL, 0),
+ LMP92001_CHAN_SPEC(8, IIO_VOLTAGE, NULL, 0),
+ LMP92001_CHAN_SPEC(9, IIO_VOLTAGE, lmp92001_events,
+ ARRAY_SIZE(lmp92001_events)),
+ LMP92001_CHAN_SPEC(10, IIO_VOLTAGE, lmp92001_events,
+ ARRAY_SIZE(lmp92001_events)),
+ LMP92001_CHAN_SPEC(11, IIO_VOLTAGE, lmp92001_events,
+ ARRAY_SIZE(lmp92001_events)),
+ LMP92001_CHAN_SPEC(12, IIO_VOLTAGE, NULL, 0),
+ LMP92001_CHAN_SPEC(13, IIO_VOLTAGE, NULL, 0),
+ LMP92001_CHAN_SPEC(14, IIO_VOLTAGE, NULL, 0),
+ LMP92001_CHAN_SPEC(15, IIO_VOLTAGE, NULL, 0),
+ LMP92001_CHAN_SPEC(16, IIO_VOLTAGE, NULL, 0),
+ LMP92001_CHAN_SPEC(17, IIO_TEMP, NULL, 0),
+};
+
+static int lmp92001_adc_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;
+ const char *conversion;
+ unsigned int cgen = 0, cad1, cad2, cad3;
+ u32 mask;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*lmp92001));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ mutex_init(&lmp92001->adc_lock);
+
+ iio_device_set_drvdata(indio_dev, lmp92001);
+
+ indio_dev->name = pdev->name;
+ indio_dev->dev.parent = &pdev->dev;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->info = &lmp92001_info;
+ indio_dev->channels = lmp92001_adc_channels;
+ indio_dev->num_channels = ARRAY_SIZE(lmp92001_adc_channels);
+
+ ret = regmap_update_bits(lmp92001->regmap, LMP92001_CGEN,
+ CGEN_RST, CGEN_RST);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to self reset all registers\n");
+ return ret;
+ }
+
+ /*
+ * Turn on all of them, if you are pretty sure they are must be
+ * real-time update or specify which channel is needed to be used to
+ * save conversion time for a cycle.
+ */
+ ret = of_property_read_u32(np, "ti,lmp92001-adc-mask", &mask);
+ if (ret < 0) {
+ cad1 = cad2 = cad3 = 0xFF;
+ dev_info(&pdev->dev, "turn on all of channels by default\n");
+ } else {
+ cad1 = mask & 0xFF;
+ cad2 = (mask >> 8) & 0xFF;
+ cad3 = (mask >> 16) & 0xFF;
+ }
+
+ ret = regmap_update_bits(lmp92001->regmap, LMP92001_CAD1, 0xFF, cad1);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to enable/disable channels 1-8\n");
+ return ret;
+ }
+
+ ret = regmap_update_bits(lmp92001->regmap, LMP92001_CAD2, 0xFF, cad2);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to enable/disable channels 9-16\n");
+ return ret;
+ }
+
+ ret = regmap_update_bits(lmp92001->regmap, LMP92001_CAD3, BIT(0), cad3);
+ if (ret < 0) {
+ dev_err(&pdev->dev,
+ "failed to enable/disable channel 17 (temperature)\n");
+ return ret;
+ }
+
+ ret = of_property_read_string_index(np, "ti,lmp92001-adc-mode", 0,
+ &conversion);
+ if (!ret) {
+ if (strncmp("continuous", conversion, 10) == 0) {
+ cgen |= 1;
+ } else if (strncmp("single-shot", conversion, 11) == 0) {
+ /* Okay */
+ } else {
+ dev_warn(&pdev->dev,
+ "wrong adc mode! set to single-short conversion\n");
+ }
+ } else
+ dev_info(&pdev->dev,
+ "single-short conversion was chosen by default\n");
+
+ /* Lock the HW registers and set conversion mode. */
+ ret = regmap_update_bits(lmp92001->regmap,
+ LMP92001_CGEN, CGEN_LCK | CGEN_STRT,
+ cgen | CGEN_LCK);
+ if (ret < 0)
+ return ret;
+
+ platform_set_drvdata(pdev, indio_dev);
+
+ return devm_iio_device_register(&pdev->dev, indio_dev);
+}
+
+static int lmp92001_adc_remove(struct platform_device *pdev)
+{
+ struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+ struct lmp92001 *lmp92001 = iio_device_get_drvdata(indio_dev);
+
+ /*
+ * To stop ADC conversion to save power
+ *
+ * Unlock the HW registers.
+ * Set conversion mode to single-shot.
+ * Lock the HW registers.
+ */
+ regmap_update_bits(lmp92001->regmap, LMP92001_CGEN, CGEN_LCK, 0);
+ regmap_update_bits(lmp92001->regmap, LMP92001_CGEN, CGEN_STRT, 0);
+ regmap_update_bits(lmp92001->regmap, LMP92001_CGEN, CGEN_LCK, CGEN_LCK);
+
+ devm_iio_device_unregister(&pdev->dev, indio_dev);
+
+ return 0;
+}
+
+static struct platform_driver lmp92001_adc_driver = {
+ .driver.name = "lmp92001-adc",
+ .probe = lmp92001_adc_probe,
+ .remove = lmp92001_adc_remove,
+};
+
+static int __init lmp92001_adc_init(void)
+{
+ return platform_driver_register(&lmp92001_adc_driver);
+}
+subsys_initcall(lmp92001_adc_init);
+
+static void __exit lmp92001_adc_exit(void)
+{
+ platform_driver_unregister(&lmp92001_adc_driver);
+}
+module_exit(lmp92001_adc_exit);
+
+MODULE_AUTHOR("Abhisit Sangjan <s.abhisit@...il.com>");
+MODULE_DESCRIPTION("IIO ADC interface for TI LMP92001");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lmp92001-adc");
diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
index 25bed2d..3e0d816 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 603587c..516d2be 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 0000000..8ea981b
--- /dev/null
+++ b/drivers/iio/dac/lmp92001-dac.c
@@ -0,0 +1,390 @@
+/*
+ * lmp92001-dac.c - Support for TI LMP92001 DACs
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@...il.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/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>
+
+#define CREF_DEXT (1 << 0) /* 1 - DAC external reference.
+ * 0 - DAC internal reference.
+ */
+#define CDAC_OFF (1 << 0) /* 1 - Forces all outputs to high impedance. */
+#define CDAC_OLVL (1 << 1) /* 1 - Cy=0 will force associated OUTx outputs
+ * to VDD.
+ * 0 - Cy=0 will force associated OUTx outputs
+ * to GND.
+ */
+#define CDAC_GANG (1 << 2) /* Controls the association of analog output
+ * channels OUTx with asynchronous control
+ * inputs Cy.
+ *
+ * Cy to OUTx Assignment
+ * --------------------------------------
+ * | Cy | CDAC:GANG = 0 | CDAC:GANG = 1 |
+ * --------------------------------------
+ * | C1 | OUT[1:4] | OUT[1:3] |
+ * --------------------------------------
+ * | C2 | OUT[5:6] | OUT[4:6] |
+ * --------------------------------------
+ * | C3 | OUT[7:8] | OUT[7:9] |
+ * --------------------------------------
+ * | C4 | OUT[9:12] | OUT[10:12] |
+ * --------------------------------------
+ */
+
+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;
+
+ mutex_lock(&lmp92001->dac_lock);
+
+ 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)
+ goto exit;
+
+ ret = IIO_VAL_INT;
+ goto exit;
+ break;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ /* In case of no match channel info/type is return here. */
+ ret = -EINVAL;
+
+exit:
+ mutex_unlock(&lmp92001->dac_lock);
+
+ return ret;
+}
+
+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;
+
+ mutex_lock(&lmp92001->dac_lock);
+
+ if (val < 0 || val > 4095) {
+ ret = -EINVAL;
+ goto exit;
+ }
+
+ 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)
+ goto exit;
+
+ ret = 0;
+ goto exit;
+ break;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ /* In case of no match channel info/type is return here. */
+ ret = -EINVAL;
+
+exit:
+ mutex_unlock(&lmp92001->dac_lock);
+
+ return ret;
+}
+
+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 & CREF_DEXT ? "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 (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;
+}
+
+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);
+}
+
+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;
+}
+
+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");
+}
+
+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), \
+ .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;
+
+ mutex_init(&lmp92001->dac_lock);
+
+ 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,
+ CDAC_GANG | CDAC_OLVL | CDAC_OFF, cdac);
+ if (ret < 0)
+ return ret;
+
+ platform_set_drvdata(pdev, indio_dev);
+
+ return devm_iio_device_register(&pdev->dev, indio_dev);
+}
+
+static int lmp92001_dac_remove(struct platform_device *pdev)
+{
+ struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+
+ devm_iio_device_unregister(&pdev->dev, indio_dev);
+
+ 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 <s.abhisit@...il.com>");
+MODULE_DESCRIPTION("IIO DAC interface for TI LMP92001");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lmp92001-dac");
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 94ad2c1..a20389a 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1528,6 +1528,18 @@ config MFD_LM3533
additional drivers must be enabled in order to use the LED,
backlight or ambient-light-sensor functionality of the device.
+config MFD_LMP92001
+ tristate "TI LMP92001 Analog System Monitor and Controller"
+ depends on I2C
+ select MFD_CORE
+ select REGMAP_I2C
+ help
+ Say yes here to enable support for TI LMP92001 Analog System
+ Monitor and Controller
+
+ This driver provide support for 16 ADC, 12 DAC, Voltage Reference,
+ Analog Temperature Sensor and 8-bit GPIO Port.
+
config MFD_TIMBERDALE
tristate "Timberdale FPGA"
select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 080793b..20d2e65 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -199,6 +199,10 @@ obj-$(CONFIG_MFD_RN5T618) += rn5t618.o
obj-$(CONFIG_MFD_SEC_CORE) += sec-core.o sec-irq.o
obj-$(CONFIG_MFD_SYSCON) += syscon.o
obj-$(CONFIG_MFD_LM3533) += lm3533-core.o lm3533-ctrlbank.o
+
+lmp92001-objs := lmp92001-core.o lmp92001-i2c.o lmp92001-debug.o
+obj-$(CONFIG_MFD_LMP92001) += lmp92001.o
+
obj-$(CONFIG_MFD_VEXPRESS_SYSREG) += vexpress-sysreg.o
obj-$(CONFIG_MFD_RETU) += retu-mfd.o
obj-$(CONFIG_MFD_AS3711) += as3711.o
diff --git a/drivers/mfd/lmp92001-core.c b/drivers/mfd/lmp92001-core.c
new file mode 100644
index 0000000..55bc9ab
--- /dev/null
+++ b/drivers/mfd/lmp92001-core.c
@@ -0,0 +1,308 @@
+/*
+ * lmp92001-core.c - Device access for TI LMP92001
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@...il.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/mfd/lmp92001/core.h>
+#include <linux/mfd/lmp92001/debug.h>
+
+static const struct mfd_cell lmp92001_devs[] = {
+ {
+ .name = "lmp92001-gpio",
+ .of_compatible = "ti,lmp92001-gpio",
+ },
+ {
+ .name = "lmp92001-adc",
+ .of_compatible = "ti,lmp92001-adc",
+ },
+ {
+ .name = "lmp92001-dac",
+ .of_compatible = "ti,lmp92001-dac",
+ },
+};
+
+static struct reg_default lmp92001_defaults[] = {
+ { LMP92001_SGEN, 0x40 },
+ { LMP92001_SHIL, 0x00 },
+ { LMP92001_SLOL, 0x00 },
+ { LMP92001_CGEN, 0x00 },
+ { LMP92001_CDAC, 0x03 },
+ { LMP92001_CGPO, 0xFF },
+ { LMP92001_CINH, 0x00 },
+ { LMP92001_CINL, 0x00 },
+ { LMP92001_CAD1, 0x00 },
+ { LMP92001_CAD2, 0x00 },
+ { LMP92001_CAD3, 0x00 },
+ { LMP92001_CTRIG, 0x00 },
+ { LMP92001_CREF, 0x07 },
+ { LMP92001_ADC1, 0x0000 },
+ { LMP92001_ADC2, 0x0000 },
+ { LMP92001_ADC3, 0x0000 },
+ { LMP92001_ADC4, 0x0000 },
+ { LMP92001_ADC5, 0x0000 },
+ { LMP92001_ADC6, 0x0000 },
+ { LMP92001_ADC7, 0x0000 },
+ { LMP92001_ADC8, 0x0000 },
+ { LMP92001_ADC9, 0x0000 },
+ { LMP92001_ADC10, 0x0000 },
+ { LMP92001_ADC11, 0x0000 },
+ { LMP92001_ADC12, 0x0000 },
+ { LMP92001_ADC13, 0x0000 },
+ { LMP92001_ADC14, 0x0000 },
+ { LMP92001_ADC15, 0x0000 },
+ { LMP92001_ADC16, 0x0000 },
+ { LMP92001_LIH1, 0x0FFF },
+ { LMP92001_LIH2, 0x0FFF },
+ { LMP92001_LIH3, 0x0FFF },
+ { LMP92001_LIH9, 0x0FFF },
+ { LMP92001_LIH10, 0x0FFF },
+ { LMP92001_LIH11, 0x0FFF },
+ { LMP92001_LIL1, 0x0000 },
+ { LMP92001_LIL2, 0x0000 },
+ { LMP92001_LIL3, 0x0000 },
+ { LMP92001_LIL9, 0x0000 },
+ { LMP92001_LIL10, 0x0000 },
+ { LMP92001_LIL11, 0x0000 },
+ { LMP92001_DAC1, 0x0000 },
+ { LMP92001_DAC2, 0x0000 },
+ { LMP92001_DAC3, 0x0000 },
+ { LMP92001_DAC4, 0x0000 },
+ { LMP92001_DAC5, 0x0000 },
+ { LMP92001_DAC6, 0x0000 },
+ { LMP92001_DAC7, 0x0000 },
+ { LMP92001_DAC8, 0x0000 },
+ { LMP92001_DAC9, 0x0000 },
+ { LMP92001_DAC10, 0x0000 },
+ { LMP92001_DAC11, 0x0000 },
+ { LMP92001_DAC12, 0x0000 },
+ { LMP92001_DALL, 0x0000 },
+};
+
+static bool lmp92001_reg_readable(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case LMP92001_ID:
+ case LMP92001_VER:
+ case LMP92001_SGEN:
+ case LMP92001_SGPI:
+ case LMP92001_SHIL:
+ case LMP92001_SLOL:
+ case LMP92001_CGEN:
+ case LMP92001_CDAC:
+ case LMP92001_CGPO:
+ case LMP92001_CINH:
+ case LMP92001_CINL:
+ case LMP92001_CAD1:
+ case LMP92001_CAD2:
+ case LMP92001_CAD3:
+ case LMP92001_ADC1:
+ case LMP92001_ADC2:
+ case LMP92001_ADC3:
+ case LMP92001_ADC4:
+ case LMP92001_ADC5:
+ case LMP92001_ADC6:
+ case LMP92001_ADC7:
+ case LMP92001_ADC8:
+ case LMP92001_ADC9:
+ case LMP92001_ADC10:
+ case LMP92001_ADC11:
+ case LMP92001_ADC12:
+ case LMP92001_ADC13:
+ case LMP92001_ADC14:
+ case LMP92001_ADC15:
+ case LMP92001_ADC16:
+ case LMP92001_ADC17:
+ case LMP92001_LIH1:
+ case LMP92001_LIH2:
+ case LMP92001_LIH3:
+ case LMP92001_LIH9:
+ case LMP92001_LIH10:
+ case LMP92001_LIH11:
+ case LMP92001_LIL1:
+ case LMP92001_LIL2:
+ case LMP92001_LIL3:
+ case LMP92001_LIL9:
+ case LMP92001_LIL10:
+ case LMP92001_LIL11:
+ case LMP92001_CREF:
+ case LMP92001_DAC1:
+ case LMP92001_DAC2:
+ case LMP92001_DAC3:
+ case LMP92001_DAC4:
+ case LMP92001_DAC5:
+ case LMP92001_DAC6:
+ case LMP92001_DAC7:
+ case LMP92001_DAC8:
+ case LMP92001_DAC9:
+ case LMP92001_DAC10:
+ case LMP92001_DAC11:
+ case LMP92001_DAC12:
+ case LMP92001_BLK0:
+ case LMP92001_BLK1:
+ case LMP92001_BLK2:
+ case LMP92001_BLK3:
+ case LMP92001_BLK4:
+ case LMP92001_BLK5:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool lmp92001_reg_writeable(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case LMP92001_CGEN:
+ case LMP92001_CDAC:
+ case LMP92001_CGPO:
+ case LMP92001_CINH:
+ case LMP92001_CINL:
+ case LMP92001_CAD1:
+ case LMP92001_CAD2:
+ case LMP92001_CAD3:
+ case LMP92001_CTRIG:
+ case LMP92001_LIH1:
+ case LMP92001_LIH2:
+ case LMP92001_LIH3:
+ case LMP92001_LIH9:
+ case LMP92001_LIH10:
+ case LMP92001_LIH11:
+ case LMP92001_LIL1:
+ case LMP92001_LIL2:
+ case LMP92001_LIL3:
+ case LMP92001_LIL9:
+ case LMP92001_LIL10:
+ case LMP92001_LIL11:
+ case LMP92001_CREF:
+ case LMP92001_DAC1:
+ case LMP92001_DAC2:
+ case LMP92001_DAC3:
+ case LMP92001_DAC4:
+ case LMP92001_DAC5:
+ case LMP92001_DAC6:
+ case LMP92001_DAC7:
+ case LMP92001_DAC8:
+ case LMP92001_DAC9:
+ case LMP92001_DAC10:
+ case LMP92001_DAC11:
+ case LMP92001_DAC12:
+ case LMP92001_DALL:
+ case LMP92001_BLK0:
+ case LMP92001_BLK1:
+ case LMP92001_BLK4:
+ case LMP92001_BLK5:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool lmp92001_reg_volatile(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case LMP92001_SGEN:
+ case LMP92001_SGPI:
+ case LMP92001_SHIL:
+ case LMP92001_SLOL:
+ case LMP92001_CGEN:
+ case LMP92001_ADC1:
+ case LMP92001_ADC2:
+ case LMP92001_ADC3:
+ case LMP92001_ADC4:
+ case LMP92001_ADC5:
+ case LMP92001_ADC6:
+ case LMP92001_ADC7:
+ case LMP92001_ADC8:
+ case LMP92001_ADC9:
+ case LMP92001_ADC10:
+ case LMP92001_ADC11:
+ case LMP92001_ADC12:
+ case LMP92001_ADC13:
+ case LMP92001_ADC14:
+ case LMP92001_ADC15:
+ case LMP92001_ADC16:
+ case LMP92001_ADC17:
+ case LMP92001_BLK2:
+ case LMP92001_BLK3:
+ return true;
+ default:
+ return false;
+ }
+}
+
+struct regmap_config lmp92001_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 16,
+
+ .cache_type = REGCACHE_RBTREE,
+
+ .reg_defaults = lmp92001_defaults,
+ .num_reg_defaults = ARRAY_SIZE(lmp92001_defaults),
+
+ .max_register = LMP92001_BLK5,
+ .readable_reg = lmp92001_reg_readable,
+ .writeable_reg = lmp92001_reg_writeable,
+ .volatile_reg = lmp92001_reg_volatile,
+};
+
+int lmp92001_device_init(struct lmp92001 *lmp92001, unsigned long id, int irq)
+{
+ int ret;
+ unsigned int comid, ver;
+
+ dev_set_drvdata(lmp92001->dev, lmp92001);
+
+ ret = regmap_read(lmp92001->regmap, LMP92001_ID, &comid);
+ if (ret < 0) {
+ dev_err(lmp92001->dev, "failed to read Company ID: %d\n", ret);
+ goto exit;
+ }
+
+ ret = regmap_read(lmp92001->regmap, LMP92001_VER, &ver);
+ if (ret < 0) {
+ dev_err(lmp92001->dev, "failed to read Version: %d\n", ret);
+ goto exit;
+ }
+
+ dev_info(lmp92001->dev, "Company ID 0x%.2x, Version 0x%.2x\n",
+ comid, ver);
+
+ ret = mfd_add_devices(lmp92001->dev, PLATFORM_DEVID_AUTO,
+ lmp92001_devs, ARRAY_SIZE(lmp92001_devs),
+ NULL, 0, NULL);
+ if (ret != 0) {
+ dev_err(lmp92001->dev, "failed to add children\n");
+ goto exit;
+ }
+
+ ret = lmp92001_debug_init(lmp92001);
+ if (ret < 0) {
+ dev_err(lmp92001->dev, "failed to initial debug fs.\n");
+ goto exit;
+ }
+
+exit:
+ return ret;
+}
+
+void lmp92001_device_exit(struct lmp92001 *lmp92001)
+{
+ lmp92001_debug_exit(lmp92001);
+ mfd_remove_devices(lmp92001->dev);
+}
diff --git a/drivers/mfd/lmp92001-debug.c b/drivers/mfd/lmp92001-debug.c
new file mode 100644
index 0000000..d733e67
--- /dev/null
+++ b/drivers/mfd/lmp92001-debug.c
@@ -0,0 +1,67 @@
+/*
+ * lmp92001-debug.c - Debug file system for TI LMP92001
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@...il.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/mfd/lmp92001/core.h>
+
+static ssize_t lmp92001_id_ver_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct lmp92001 *lmp92001 = dev_get_drvdata(dev);
+ int ret;
+ unsigned int comid, ver;
+
+ ret = regmap_read(lmp92001->regmap, LMP92001_ID, &comid);
+ if (ret < 0) {
+ dev_err(lmp92001->dev, "failed to read Company ID: %d\n", ret);
+ return 0;
+ }
+
+ ret = regmap_read(lmp92001->regmap, LMP92001_VER, &ver);
+ if (ret < 0) {
+ dev_err(lmp92001->dev, "failed to read Version: %d\n", ret);
+ return 0;
+ }
+
+ ret = sprintf(buf, "Company ID 0x%02x (%d), Version 0x%02x (%d)\n",
+ comid, comid, ver, ver);
+
+ return ret;
+}
+static DEVICE_ATTR(lmp92001_id_ver, 0444, lmp92001_id_ver_show, NULL);
+
+int lmp92001_debug_init(struct lmp92001 *lmp92001)
+{
+ int ret;
+
+ ret = device_create_file(lmp92001->dev, &dev_attr_lmp92001_id_ver);
+ if (ret != 0)
+ dev_err(lmp92001->dev,
+ "unique ID attribute is not created: %d\n", ret);
+
+ return ret;
+}
+
+void lmp92001_debug_exit(struct lmp92001 *lmp92001)
+{
+ device_remove_file(lmp92001->dev, &dev_attr_lmp92001_id_ver);
+}
diff --git a/drivers/mfd/lmp92001-i2c.c b/drivers/mfd/lmp92001-i2c.c
new file mode 100644
index 0000000..bbb1dad
--- /dev/null
+++ b/drivers/mfd/lmp92001-i2c.c
@@ -0,0 +1,215 @@
+/*
+ * lmp92001-i2c.c - I2C access for TI LMP92001
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@...il.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/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <linux/mfd/lmp92001/core.h>
+
+static const unsigned short lmp92001_i2c_addresses[] = {
+ 0x40, 0x42, 0x44, 0x46, 0x48, 0x4A, 0x4C, 0x4E, 0x50, I2C_CLIENT_END
+};
+
+/* TODO: To read/write block access, it may need to re-ordering endianness! */
+static int lmp92001_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+ struct device *dev = context;
+ struct i2c_client *i2c = to_i2c_client(dev);
+ int ret;
+
+ if (reg > 0xff)
+ return -EINVAL;
+
+ switch (reg) {
+ case LMP92001_ID ... LMP92001_CTRIG:
+ case LMP92001_CREF:
+ ret = i2c_smbus_read_byte_data(i2c, reg);
+ break;
+ case LMP92001_ADC1 ... LMP92001_LIL11:
+ case LMP92001_DAC1 ... LMP92001_DALL:
+ ret = i2c_smbus_read_word_swapped(i2c, reg);
+ break;
+ case LMP92001_BLK0 ... LMP92001_BLK5:
+ ret = i2c_smbus_read_block_data(i2c, reg,
+ (u8 *)((uintptr_t)*val));
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (ret < 0)
+ return ret;
+
+ if (reg <= LMP92001_DALL)
+ *val = ret;
+
+ return 0;
+}
+
+static int lmp92001_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+ struct device *dev = context;
+ struct i2c_client *i2c = to_i2c_client(dev);
+ int ret;
+
+ if (reg > 0xff)
+ return -EINVAL;
+
+ switch (reg) {
+ case LMP92001_ID ... LMP92001_CTRIG:
+ case LMP92001_CREF:
+ ret = i2c_smbus_write_byte_data(i2c, reg, val);
+ break;
+ case LMP92001_ADC1 ... LMP92001_LIL11:
+ case LMP92001_DAC1 ... LMP92001_DALL:
+ ret = i2c_smbus_write_word_swapped(i2c, reg, val);
+ break;
+ /* To call this function/case, must be passed val as pointer */
+ case LMP92001_BLK0:
+ case LMP92001_BLK4:
+ ret = i2c_smbus_write_block_data(i2c, reg, 24,
+ (u8 *)((uintptr_t)val));
+ break;
+ case LMP92001_BLK1:
+ case LMP92001_BLK5:
+ ret = i2c_smbus_write_block_data(i2c, reg, 12,
+ (u8 *)((uintptr_t)val));
+ break;
+ case LMP92001_BLK2:
+ ret = i2c_smbus_write_block_data(i2c, reg, 34,
+ (u8 *)((uintptr_t)val));
+ break;
+ case LMP92001_BLK3:
+ ret = i2c_smbus_write_block_data(i2c, reg, 18,
+ (u8 *)((uintptr_t)val));
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int lmp92001_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct lmp92001 *lmp92001;
+ int ret;
+
+ lmp92001 = devm_kzalloc(&i2c->dev, sizeof(struct lmp92001), GFP_KERNEL);
+ if (!lmp92001)
+ return -ENOMEM;
+
+ i2c_set_clientdata(i2c, lmp92001);
+ lmp92001->dev = &i2c->dev;
+
+ lmp92001_regmap_config.reg_read = lmp92001_reg_read;
+ lmp92001_regmap_config.reg_write = lmp92001_reg_write;
+
+ lmp92001->regmap = devm_regmap_init(&i2c->dev, NULL, &i2c->dev,
+ &lmp92001_regmap_config);
+ if (IS_ERR(lmp92001->regmap)) {
+ ret = PTR_ERR(lmp92001->regmap);
+ dev_err(lmp92001->dev, "failed to allocate register map: %d\n",
+ ret);
+ return ret;
+ }
+
+ return lmp92001_device_init(lmp92001, id->driver_data, i2c->irq);
+}
+
+static int lmp92001_i2c_remove(struct i2c_client *i2c)
+{
+ struct lmp92001 *lmp92001 = i2c_get_clientdata(i2c);
+
+ lmp92001_device_exit(lmp92001);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id lmp92001_dt_ids[] = {
+ { .compatible = "ti,lmp92001", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, lmp92001_dt_ids);
+#endif
+
+static const struct i2c_device_id lmp92001_i2c_ids[] = {
+ { "lmp92001" },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, lmp92001_i2c_ids);
+
+static int lmp92001_i2c_detect(struct i2c_client *i2c,
+ struct i2c_board_info *info)
+{
+ struct i2c_adapter *adapter = i2c->adapter;
+ s32 comid, ver;
+
+ if (!i2c_check_functionality(adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA |
+ I2C_FUNC_SMBUS_WORD_DATA |
+ I2C_FUNC_SMBUS_BLOCK_DATA))
+ return -ENODEV;
+
+ comid = i2c_smbus_read_byte_data(i2c, LMP92001_ID);
+ ver = i2c_smbus_read_byte_data(i2c, LMP92001_VER);
+
+ if (comid != 0x01 || ver != 0x10)
+ return -ENODEV;
+
+ return 0;
+}
+
+static struct i2c_driver lmp92001_i2c_driver = {
+ .driver = {
+ .name = "lmp92001",
+ .of_match_table = of_match_ptr(lmp92001_dt_ids),
+ },
+ .probe = lmp92001_i2c_probe,
+ .remove = lmp92001_i2c_remove,
+ .id_table = lmp92001_i2c_ids,
+ .detect = lmp92001_i2c_detect,
+ .address_list = lmp92001_i2c_addresses,
+};
+
+static int __init lmp92001_i2c_init(void)
+{
+ return i2c_add_driver(&lmp92001_i2c_driver);
+}
+subsys_initcall(lmp92001_i2c_init);
+
+static void __exit lmp92001_i2c_exit(void)
+{
+ i2c_del_driver(&lmp92001_i2c_driver);
+}
+module_exit(lmp92001_i2c_exit);
+
+MODULE_DESCRIPTION("i2c driver for TI LMP92001");
+MODULE_AUTHOR("Abhisit Sangjan <s.abhisit@...il.com>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/lmp92001/core.h b/include/linux/mfd/lmp92001/core.h
new file mode 100644
index 0000000..9039000
--- /dev/null
+++ b/include/linux/mfd/lmp92001/core.h
@@ -0,0 +1,119 @@
+/*
+ * include/linux/mfd/lmp92001/core.h - Core interface for TI LMP92001
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@...il.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.
+ *
+ */
+
+#ifndef __MFD_LMP92001_CORE_H__
+#define __MFD_LMP92001_CORE_H__
+
+#include <linux/device.h>
+#include <linux/mfd/core.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+
+/*
+ * Register values.
+ */
+/* ID */
+#define LMP92001_ID 0x0E
+#define LMP92001_VER 0x0F
+/* STATUS */
+#define LMP92001_SGEN 0x10
+#define LMP92001_SGPI 0x11
+#define LMP92001_SHIL 0x12
+#define LMP92001_SLOL 0x13
+/* CONTROL */
+#define LMP92001_CGEN 0x14
+#define LMP92001_CDAC 0x15
+#define LMP92001_CGPO 0x16
+#define LMP92001_CINH 0x17
+#define LMP92001_CINL 0x18
+#define LMP92001_CAD1 0x19
+#define LMP92001_CAD2 0x1A
+#define LMP92001_CAD3 0x1B
+#define LMP92001_CTRIG 0x1C
+/* ADC OUTPUT DATA */
+#define LMP92001_ADC1 0x20
+#define LMP92001_ADC2 0x21
+#define LMP92001_ADC3 0x22
+#define LMP92001_ADC4 0x23
+#define LMP92001_ADC5 0x24
+#define LMP92001_ADC6 0x25
+#define LMP92001_ADC7 0x26
+#define LMP92001_ADC8 0x27
+#define LMP92001_ADC9 0x28
+#define LMP92001_ADC10 0x29
+#define LMP92001_ADC11 0x2A
+#define LMP92001_ADC12 0x2B
+#define LMP92001_ADC13 0x2C
+#define LMP92001_ADC14 0x2D
+#define LMP92001_ADC15 0x2E
+#define LMP92001_ADC16 0x2F
+#define LMP92001_ADC17 0x30
+/* ADC WINDOW COMPARATOR LIMITS */
+#define LMP92001_LIH1 0x40
+#define LMP92001_LIH2 0x41
+#define LMP92001_LIH3 0x42
+#define LMP92001_LIH9 0x43
+#define LMP92001_LIH10 0x44
+#define LMP92001_LIH11 0x45
+#define LMP92001_LIL1 0x46
+#define LMP92001_LIL2 0x47
+#define LMP92001_LIL3 0x48
+#define LMP92001_LIL9 0x49
+#define LMP92001_LIL10 0x4A
+#define LMP92001_LIL11 0x4B
+/* INTERNAL REFERENCE CONTROL */
+#define LMP92001_CREF 0x66
+/* DAC INPUT DATA */
+#define LMP92001_DAC1 0x80
+#define LMP92001_DAC2 0x81
+#define LMP92001_DAC3 0x82
+#define LMP92001_DAC4 0x83
+#define LMP92001_DAC5 0x84
+#define LMP92001_DAC6 0x85
+#define LMP92001_DAC7 0x86
+#define LMP92001_DAC8 0x87
+#define LMP92001_DAC9 0x88
+#define LMP92001_DAC10 0x89
+#define LMP92001_DAC11 0x8A
+#define LMP92001_DAC12 0x8B
+#define LMP92001_DALL 0x90
+/* MEMORY MAPPED BLOCK COMMANDS */
+#define LMP92001_BLK0 0xF0
+#define LMP92001_BLK1 0xF1
+#define LMP92001_BLK2 0xF2
+#define LMP92001_BLK3 0xF3
+#define LMP92001_BLK4 0xF4
+#define LMP92001_BLK5 0xF5
+
+struct lmp92001 {
+ struct device *dev;
+ struct regmap *regmap;
+
+ struct mutex adc_lock;
+ struct mutex dac_lock;
+};
+
+extern struct regmap_config lmp92001_regmap_config;
+
+int lmp92001_device_init(struct lmp92001 *lmp92001, unsigned long id, int irq);
+void lmp92001_device_exit(struct lmp92001 *lmp92001);
+
+#endif /* __MFD_LMP92001_CORE_H__ */
diff --git a/include/linux/mfd/lmp92001/debug.h b/include/linux/mfd/lmp92001/debug.h
new file mode 100644
index 0000000..efef95f
--- /dev/null
+++ b/include/linux/mfd/lmp92001/debug.h
@@ -0,0 +1,28 @@
+/*
+ * include/linux/mfd/lmp92001/debug.h - Debug interface for TI 92001
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@...il.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.
+ *
+ */
+
+#ifndef __MFD_LMP92001_DEBUG_H__
+#define __MFD_LMP92001_DEBUG_H__
+
+int lmp92001_debug_init(struct lmp92001 *lmp92001);
+void lmp92001_debug_exit(struct lmp92001 *lmp92001);
+
+#endif /* __MFD_LMP92001_DEBUG_H__ */
--
2.7.4
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