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path: root/drivers/gpio/gpio-adp5520.c
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Diffstat (limited to 'drivers/gpio/gpio-adp5520.c')
-rw-r--r--drivers/gpio/gpio-adp5520.c167
1 files changed, 167 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-adp5520.c b/drivers/gpio/gpio-adp5520.c
new file mode 100644
index 000000000..c55e821c6
--- /dev/null
+++ b/drivers/gpio/gpio-adp5520.c
@@ -0,0 +1,167 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * GPIO driver for Analog Devices ADP5520 MFD PMICs
+ *
+ * Copyright 2009 Analog Devices Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/adp5520.h>
+#include <linux/gpio/driver.h>
+
+struct adp5520_gpio {
+ struct device *master;
+ struct gpio_chip gpio_chip;
+ unsigned char lut[ADP5520_MAXGPIOS];
+ unsigned long output;
+};
+
+static int adp5520_gpio_get_value(struct gpio_chip *chip, unsigned off)
+{
+ struct adp5520_gpio *dev;
+ uint8_t reg_val;
+
+ dev = gpiochip_get_data(chip);
+
+ /*
+ * There are dedicated registers for GPIO IN/OUT.
+ * Make sure we return the right value, even when configured as output
+ */
+
+ if (test_bit(off, &dev->output))
+ adp5520_read(dev->master, ADP5520_GPIO_OUT, &reg_val);
+ else
+ adp5520_read(dev->master, ADP5520_GPIO_IN, &reg_val);
+
+ return !!(reg_val & dev->lut[off]);
+}
+
+static void adp5520_gpio_set_value(struct gpio_chip *chip,
+ unsigned off, int val)
+{
+ struct adp5520_gpio *dev;
+ dev = gpiochip_get_data(chip);
+
+ if (val)
+ adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]);
+ else
+ adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]);
+}
+
+static int adp5520_gpio_direction_input(struct gpio_chip *chip, unsigned off)
+{
+ struct adp5520_gpio *dev;
+ dev = gpiochip_get_data(chip);
+
+ clear_bit(off, &dev->output);
+
+ return adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_2,
+ dev->lut[off]);
+}
+
+static int adp5520_gpio_direction_output(struct gpio_chip *chip,
+ unsigned off, int val)
+{
+ struct adp5520_gpio *dev;
+ int ret = 0;
+ dev = gpiochip_get_data(chip);
+
+ set_bit(off, &dev->output);
+
+ if (val)
+ ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_OUT,
+ dev->lut[off]);
+ else
+ ret |= adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT,
+ dev->lut[off]);
+
+ ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_2,
+ dev->lut[off]);
+
+ return ret;
+}
+
+static int adp5520_gpio_probe(struct platform_device *pdev)
+{
+ struct adp5520_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
+ struct adp5520_gpio *dev;
+ struct gpio_chip *gc;
+ int ret, i, gpios;
+ unsigned char ctl_mask = 0;
+
+ if (pdata == NULL) {
+ dev_err(&pdev->dev, "missing platform data\n");
+ return -ENODEV;
+ }
+
+ if (pdev->id != ID_ADP5520) {
+ dev_err(&pdev->dev, "only ADP5520 supports GPIO\n");
+ return -ENODEV;
+ }
+
+ dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+ if (dev == NULL)
+ return -ENOMEM;
+
+ dev->master = pdev->dev.parent;
+
+ for (gpios = 0, i = 0; i < ADP5520_MAXGPIOS; i++)
+ if (pdata->gpio_en_mask & (1 << i))
+ dev->lut[gpios++] = 1 << i;
+
+ if (gpios < 1)
+ return -EINVAL;
+
+ gc = &dev->gpio_chip;
+ gc->direction_input = adp5520_gpio_direction_input;
+ gc->direction_output = adp5520_gpio_direction_output;
+ gc->get = adp5520_gpio_get_value;
+ gc->set = adp5520_gpio_set_value;
+ gc->can_sleep = true;
+
+ gc->base = pdata->gpio_start;
+ gc->ngpio = gpios;
+ gc->label = pdev->name;
+ gc->owner = THIS_MODULE;
+
+ ret = adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_1,
+ pdata->gpio_en_mask);
+
+ if (pdata->gpio_en_mask & ADP5520_GPIO_C3)
+ ctl_mask |= ADP5520_C3_MODE;
+
+ if (pdata->gpio_en_mask & ADP5520_GPIO_R3)
+ ctl_mask |= ADP5520_R3_MODE;
+
+ if (ctl_mask)
+ ret = adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
+ ctl_mask);
+
+ ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
+ pdata->gpio_pullup_mask);
+
+ if (ret) {
+ dev_err(&pdev->dev, "failed to write\n");
+ return ret;
+ }
+
+ return devm_gpiochip_add_data(&pdev->dev, &dev->gpio_chip, dev);
+}
+
+static struct platform_driver adp5520_gpio_driver = {
+ .driver = {
+ .name = "adp5520-gpio",
+ },
+ .probe = adp5520_gpio_probe,
+};
+
+module_platform_driver(adp5520_gpio_driver);
+
+MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
+MODULE_DESCRIPTION("GPIO ADP5520 Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:adp5520-gpio");