Added: trunk/drivers/gpio/adp5520-gpio.c (0 => 6186)
--- trunk/drivers/gpio/adp5520-gpio.c (rev 0)
+++ trunk/drivers/gpio/adp5520-gpio.c 2009-03-17 12:42:56 UTC (rev 6186)
@@ -0,0 +1,202 @@
+/*
+ * GPIO driver for Analog Devices ADP5520 MFD PMICs
+ *
+ * Copyright 2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/adp5520.h>
+
+#include <linux/gpio.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 = container_of(chip, struct adp5520_gpio, gpio_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, GPIO_OUT, ®_val);
+ else
+ adp5520_read(dev->master, GPIO_IN, ®_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 = container_of(chip, struct adp5520_gpio, gpio_chip);
+
+ if (val)
+ adp5520_set_bits(dev->master, GPIO_OUT, dev->lut[off]);
+ else
+ adp5520_clr_bits(dev->master, GPIO_OUT, dev->lut[off]);
+}
+
+static int adp5520_gpio_direction_input(struct gpio_chip *chip, unsigned off)
+{
+ struct adp5520_gpio *dev;
+ dev = container_of(chip, struct adp5520_gpio, gpio_chip);
+
+ clear_bit(off, &dev->output);
+
+ return adp5520_clr_bits(dev->master, 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 = container_of(chip, struct adp5520_gpio, gpio_chip);
+
+ set_bit(off, &dev->output);
+
+ if (val)
+ ret |= adp5520_set_bits(dev->master, GPIO_OUT, dev->lut[off]);
+ else
+ ret |= adp5520_clr_bits(dev->master, GPIO_OUT, dev->lut[off]);
+
+ ret |= adp5520_set_bits(dev->master, GPIO_CFG_2, dev->lut[off]);
+
+ return ret;
+}
+
+static int __devinit adp5520_gpio_probe(struct platform_device *pdev)
+{
+ struct adp5520_gpio_platfrom_data *pdata = pdev->dev.platform_data;
+ struct adp5520_gpio *dev;
+ struct gpio_chip *gc;
+ int ret, i, gpios;
+ unsigned char ctl_mask = 0;
+
+ if (pdata == NULL)
+ return 0;
+
+ if (pdev->id != ID_ADP5520)
+ return 0;
+
+ dev = kzalloc(sizeof(struct adp5520_gpio), GFP_KERNEL);
+ if (dev == NULL) {
+ dev_err(&pdev->dev, "failed to alloc memory\n");
+ 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) {
+ ret = -EINVAL;
+ goto err;
+ }
+
+ 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 = 1;
+
+ gc->base = pdata->gpio_start;
+ gc->ngpio = gpios;
+ gc->label = pdev->name;
+ gc->owner = THIS_MODULE;
+
+ ret = adp5520_clr_bits(dev->master, GPIO_CFG_1,
+ pdata->gpio_en_mask);
+
+ if (pdata->gpio_en_mask & GPIO_C3)
+ ctl_mask |= C3_MODE;
+
+ if (pdata->gpio_en_mask & GPIO_R3)
+ ctl_mask |= R3_MODE;
+
+ if (ctl_mask)
+ ret = adp5520_set_bits(dev->master, LED_CONTROL,
+ ctl_mask);
+
+ ret |= adp5520_set_bits(dev->master, GPIO_PULLUP,
+ pdata->gpio_pullup_mask);
+
+ if (ret) {
+ dev_err(&pdev->dev, "failed to write\n");
+ goto err;
+ }
+
+ ret = gpiochip_add(&dev->gpio_chip);
+ if (ret)
+ goto err;
+
+ platform_set_drvdata(pdev, dev);
+ return 0;
+
+err:
+ kfree(dev);
+ return ret;
+}
+
+static int __devexit adp5520_gpio_remove(struct platform_device *pdev)
+{
+ struct adp5520_gpio *dev;
+ int ret;
+
+ dev = platform_get_drvdata(pdev);
+ ret = gpiochip_remove(&dev->gpio_chip);
+ if (ret) {
+ dev_err(&pdev->dev, "%s failed, %d\n",
+ "gpiochip_remove()", ret);
+ return ret;
+ }
+
+ kfree(dev);
+ return 0;
+}
+
+static struct platform_driver adp5520_gpio_driver = {
+ .driver = {
+ .name = "adp5520-gpio",
+ .owner = THIS_MODULE,
+ },
+ .probe = adp5520_gpio_probe,
+ .remove = __devexit_p(adp5520_gpio_remove),
+};
+
+static int __init adp5520_gpio_init(void)
+{
+ return platform_driver_register(&adp5520_gpio_driver);
+}
+module_init(adp5520_gpio_init);
+
+static void __exit adp5520_gpio_exit(void)
+{
+ platform_driver_unregister(&adp5520_gpio_driver);
+}
+module_exit(adp5520_gpio_exit);
+
+MODULE_AUTHOR("Michael Hennerich <[email protected]>");
+MODULE_DESCRIPTION("GPIO ADP5520 Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:adp5520-gpio");
