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authorMargarita Olaya <magi@slimlogic.co.uk>2011-06-09 14:50:19 -0500
committerSamuel Ortiz <sameo@linux.intel.com>2011-07-31 23:28:22 +0200
commit668a6cc710ee054af2b059d27bbec746ead0fbca (patch)
tree67b13e972464064fe81529613aaba32874352746 /drivers/gpio/gpio-tps65912.c
parentd49a0f3f14a763242b71244019d7881ee06e0658 (diff)
tps65912: gpio: add gpio driver
TPS65912 has five GPIOs that can be configured for different purposes. Signed-off-by: Margarita Olaya Cabrera <magi@slimlogic.co.uk> Acked-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Liam Girdwood <lrg@ti.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/gpio/gpio-tps65912.c')
-rw-r--r--drivers/gpio/gpio-tps65912.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-tps65912.c b/drivers/gpio/gpio-tps65912.c
new file mode 100644
index 000000000000..79e66c002350
--- /dev/null
+++ b/drivers/gpio/gpio-tps65912.c
@@ -0,0 +1,156 @@
+/*
+ * Copyright 2011 Texas Instruments Inc.
+ *
+ * Author: Margarita Olaya <magi@slimlogic.co.uk>
+ *
+ * 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 driver is based on wm8350 implementation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/gpio.h>
+#include <linux/mfd/core.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/mfd/tps65912.h>
+
+struct tps65912_gpio_data {
+ struct tps65912 *tps65912;
+ struct gpio_chip gpio_chip;
+};
+
+static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset)
+{
+ struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio);
+ int val;
+
+ val = tps65912_reg_read(tps65912, TPS65912_GPIO1 + offset);
+
+ if (val & GPIO_STS_MASK)
+ return 1;
+
+ return 0;
+}
+
+static void tps65912_gpio_set(struct gpio_chip *gc, unsigned offset,
+ int value)
+{
+ struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio);
+
+ if (value)
+ tps65912_set_bits(tps65912, TPS65912_GPIO1 + offset,
+ GPIO_SET_MASK);
+ else
+ tps65912_clear_bits(tps65912, TPS65912_GPIO1 + offset,
+ GPIO_SET_MASK);
+}
+
+static int tps65912_gpio_output(struct gpio_chip *gc, unsigned offset,
+ int value)
+{
+ struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio);
+
+ /* Set the initial value */
+ tps65912_gpio_set(gc, offset, value);
+
+ return tps65912_set_bits(tps65912, TPS65912_GPIO1 + offset,
+ GPIO_CFG_MASK);
+}
+
+static int tps65912_gpio_input(struct gpio_chip *gc, unsigned offset)
+{
+ struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio);
+
+ return tps65912_clear_bits(tps65912, TPS65912_GPIO1 + offset,
+ GPIO_CFG_MASK);
+
+}
+
+static struct gpio_chip template_chip = {
+ .label = "tps65912",
+ .owner = THIS_MODULE,
+ .direction_input = tps65912_gpio_input,
+ .direction_output = tps65912_gpio_output,
+ .get = tps65912_gpio_get,
+ .set = tps65912_gpio_set,
+ .can_sleep = 1,
+ .ngpio = 5,
+ .base = -1,
+};
+
+static int __devinit tps65912_gpio_probe(struct platform_device *pdev)
+{
+ struct tps65912 *tps65912 = dev_get_drvdata(pdev->dev.parent);
+ struct tps65912_board *pdata = tps65912->dev->platform_data;
+ struct tps65912_gpio_data *tps65912_gpio;
+ int ret;
+
+ tps65912_gpio = kzalloc(sizeof(*tps65912_gpio), GFP_KERNEL);
+ if (tps65912_gpio == NULL)
+ return -ENOMEM;
+
+ tps65912_gpio->tps65912 = tps65912;
+ tps65912_gpio->gpio_chip = template_chip;
+ tps65912_gpio->gpio_chip.dev = &pdev->dev;
+ if (pdata && pdata->gpio_base)
+ tps65912_gpio->gpio_chip.base = pdata->gpio_base;
+
+ ret = gpiochip_add(&tps65912_gpio->gpio_chip);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
+ goto err;
+ }
+
+ platform_set_drvdata(pdev, tps65912_gpio);
+
+ return ret;
+
+err:
+ kfree(tps65912_gpio);
+ return ret;
+}
+
+static int __devexit tps65912_gpio_remove(struct platform_device *pdev)
+{
+ struct tps65912_gpio_data *tps65912_gpio = platform_get_drvdata(pdev);
+ int ret;
+
+ ret = gpiochip_remove(&tps65912_gpio->gpio_chip);
+ if (ret == 0)
+ kfree(tps65912_gpio);
+
+ return ret;
+}
+
+static struct platform_driver tps65912_gpio_driver = {
+ .driver = {
+ .name = "tps65912-gpio",
+ .owner = THIS_MODULE,
+ },
+ .probe = tps65912_gpio_probe,
+ .remove = __devexit_p(tps65912_gpio_remove),
+};
+
+static int __init tps65912_gpio_init(void)
+{
+ return platform_driver_register(&tps65912_gpio_driver);
+}
+subsys_initcall(tps65912_gpio_init);
+
+static void __exit tps65912_gpio_exit(void)
+{
+ platform_driver_unregister(&tps65912_gpio_driver);
+}
+module_exit(tps65912_gpio_exit);
+
+MODULE_AUTHOR("Margarita Olaya Cabrera <magi@slimlogic.co.uk>");
+MODULE_DESCRIPTION("GPIO interface for TPS65912 PMICs");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:tps65912-gpio");