From: Abhisit Sangjan <s.abhi...@gmail.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.
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 <s.abhi...@gmail.com>
---
drivers/gpio/Kconfig | 7 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-lmp92001.c | 202 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 210 insertions(+)
create mode 100644 drivers/gpio/gpio-lmp92001.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 461d6fc3688b..5962ea0d6745 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 a9fda6c55113..560d59c67758 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 000000000000..4079e362e9b3
--- /dev/null
+++ b/drivers/gpio/gpio-lmp92001.c
@@ -0,0 +1,202 @@
+/*
+ * gpio-lmp92001.c - Support for TI LMP92001 GPIOs
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhi...@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/bitops.h>
+#include <linux/gpio/driver.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include <linux/mfd/lmp92001/core.h>
+
+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 & BIT(offset));
+}
+
+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 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 /* 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)
+{
+ 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.abhi...@gmail.com>");
+MODULE_DESCRIPTION("GPIO interface for TI LMP92001");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lmp92001-gpio");
--
2.13.0
