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Date: Fri, 22 Oct 2010 19:04:19 +0100
From: Alan Cox <alan@...rguk.ukuu.org.uk>
To: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: [PATCH (CORRECTED)] langwell_gpio: Add support for whitney point
I must remember to refresh before sending, I must remember to refresh before
sending. I must ...
From: Alan Cox <alan@...ux.intel.com>
In this case the logic is very similar but the IRQs are not exposed and the
device is not picked up via PCI
Based on a separate internal whitney point driver by:
Yin Kangkai <kangkai.yin@...el.com>
Signed-off-by: Alan Cox <alan@...ux.intel.com>
---
drivers/gpio/langwell_gpio.c | 83 +++++++++++++++++++++++++++++++++++++++++-
1 files changed, 82 insertions(+), 1 deletions(-)
diff --git a/drivers/gpio/langwell_gpio.c b/drivers/gpio/langwell_gpio.c
index 8383a8d..09d74b3 100644
--- a/drivers/gpio/langwell_gpio.c
+++ b/drivers/gpio/langwell_gpio.c
@@ -18,10 +18,12 @@
/* Supports:
* Moorestown platform Langwell chip.
* Medfield platform Penwell chip.
+ * Whitney point.
*/
#include <linux/module.h>
#include <linux/pci.h>
+#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/stddef.h>
@@ -300,9 +302,88 @@ static struct pci_driver lnw_gpio_driver = {
.probe = lnw_gpio_probe,
};
+
+static int __devinit wp_gpio_probe(struct platform_device *pdev)
+{
+ struct lnw_gpio *lnw;
+ struct gpio_chip *gc;
+ struct resource *rc;
+ int retval = 0;
+
+ rc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!rc)
+ return -EINVAL;
+
+ lnw = kzalloc(sizeof(struct lnw_gpio), GFP_KERNEL);
+ if (!lnw) {
+ dev_err(&pdev->dev,
+ "can't allocate whitneypoint_gpio chip data\n");
+ return -ENOMEM;
+ }
+ lnw->reg_base = ioremap_nocache(rc->start, resource_size(rc));
+ if (lnw->reg_base == NULL) {
+ retval = -EINVAL;
+ goto err_kmalloc;
+ }
+ spin_lock_init(&lnw->lock);
+ gc = &lnw->chip;
+ gc->label = dev_name(&pdev->dev);
+ gc->owner = THIS_MODULE;
+ gc->direction_input = lnw_gpio_direction_input;
+ gc->direction_output = lnw_gpio_direction_output;
+ gc->get = lnw_gpio_get;
+ gc->set = lnw_gpio_set;
+ gc->to_irq = NULL;
+ gc->base = 0;
+ gc->ngpio = 64;
+ gc->can_sleep = 0;
+ retval = gpiochip_add(gc);
+ if (retval) {
+ dev_err(&pdev->dev, "whitneypoint gpiochip_add error %d\n",
+ retval);
+ goto err_ioremap;
+ }
+ platform_set_drvdata(pdev, lnw);
+ return 0;
+err_ioremap:
+ iounmap(lnw->reg_base);
+err_kmalloc:
+ kfree(lnw);
+ return retval;
+}
+
+static int __devexit wp_gpio_remove(struct platform_device *pdev)
+{
+ struct lnw_gpio *lnw = platform_get_drvdata(pdev);
+ int err;
+ err = gpiochip_remove(&lnw->chip);
+ if (err)
+ dev_err(&pdev->dev, "failed to remove gpio_chip.\n");
+ iounmap(lnw->reg_base);
+ kfree(lnw);
+ platform_set_drvdata(pdev, NULL);
+ return 0;
+}
+
+static struct platform_driver wp_gpio_driver = {
+ .probe = wp_gpio_probe,
+ .remove = __devexit_p(wp_gpio_remove),
+ .driver = {
+ .name = "wp_gpio",
+ .owner = THIS_MODULE,
+ },
+};
+
static int __init lnw_gpio_init(void)
{
- return pci_register_driver(&lnw_gpio_driver);
+ int ret;
+ ret = pci_register_driver(&lnw_gpio_driver);
+ if (ret < 0)
+ return ret;
+ ret = platform_driver_register(&wp_gpio_driver);
+ if (ret < 0)
+ pci_unregister_driver(&lnw_gpio_driver);
+ return ret;
}
device_initcall(lnw_gpio_init);
--
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