[PATCH v4 11/13] [POWERPC] Motion-PRO: Add LED support
Marian Balakowicz
m8 at semihalf.com
Sat Nov 10 04:12:43 EST 2007
Add LED driver for Promess Motion-PRO board.
Signed-off-by: Jan Wrobel <wrr at semihalf.com>
Signed-off-by: Marian Balakowicz <m8 at semihalf.com>
---
drivers/leds/Kconfig | 7 +
drivers/leds/Makefile | 3
drivers/leds/leds-motionpro.c | 250 +++++++++++++++++++++++++++++++++++++++++
include/asm-powerpc/mpc52xx.h | 5 +
4 files changed, 264 insertions(+), 1 deletions(-)
create mode 100644 drivers/leds/leds-motionpro.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index ec568fa..1567ed6 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -55,6 +55,13 @@ config LEDS_TOSA
This option enables support for the LEDs on Sharp Zaurus
SL-6000 series.
+config LEDS_MOTIONPRO
+ tristate "Motion-PRO LEDs Support"
+ depends on LEDS_CLASS && PPC_MPC5200
+ help
+ This option enables support for status and ready LEDs connected
+ to GPIO lines on Motion-PRO board.
+
config LEDS_S3C24XX
tristate "LED Support for Samsung S3C24XX GPIO LEDs"
depends on LEDS_CLASS && ARCH_S3C2410
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index a60de1b..a56d399 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -18,7 +18,8 @@ obj-$(CONFIG_LEDS_H1940) += leds-h1940.o
obj-$(CONFIG_LEDS_COBALT_QUBE) += leds-cobalt-qube.o
obj-$(CONFIG_LEDS_COBALT_RAQ) += leds-cobalt-raq.o
obj-$(CONFIG_LEDS_GPIO) += leds-gpio.o
-obj-$(CONFIG_LEDS_CM_X270) += leds-cm-x270.o
+obj-$(CONFIG_LEDS_CM_X270) += leds-cm-x270.o
+obj-$(CONFIG_LEDS_MOTIONPRO) += leds-motionpro.o
# LED Triggers
obj-$(CONFIG_LEDS_TRIGGER_TIMER) += ledtrig-timer.o
diff --git a/drivers/leds/leds-motionpro.c b/drivers/leds/leds-motionpro.c
new file mode 100644
index 0000000..7c422d2
--- /dev/null
+++ b/drivers/leds/leds-motionpro.c
@@ -0,0 +1,250 @@
+/*
+ * LEDs driver for the Motion-PRO board.
+ *
+ * Copyright (C) 2007 Semihalf
+ * Jan Wrobel <wrr at semihalf.com>
+ * Marian Balakowicz <m8 at semihalf.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ *
+ * Decription:
+ * This driver enables control over Motion-PRO status and ready LEDs through
+ * sysfs. LEDs can be controlled by writing to sysfs files:
+ * class/leds/<led-name>/(brightness|delay_off|delay_on).
+ * See Documentation/leds-class.txt for more details.
+ * <led-name> is the set to the value of 'label' property of the
+ * corresponding GPT node.
+ *
+ * Before user issues first control command via sysfs, LED blinking is
+ * controlled by the kernel ('blink-delay' property of the GPT node
+ * in the device tree blob).
+ *
+ */
+
+#define DEBUG
+
+#include <linux/module.h>
+#include <linux/leds.h>
+#include <linux/of_platform.h>
+#include <asm/mpc52xx.h>
+
+/* LED control bits */
+#define LED_ON MPC52xx_GPT_OUTPUT_1
+
+/* LED mode */
+#define LED_MODE_KERNEL 1
+#define LED_MODE_USER 2
+
+struct motionpro_led {
+ spinlock_t led_lock; /* Protects the LED data */
+ struct mpc52xx_gpt __iomem *gpt;/* LED registers */
+ struct timer_list blink_timer; /* Used if blink_delay is nonzero */
+ unsigned int blink_delay; /* [ms], if set to 0 blinking is off */
+ unsigned int mode; /* kernel/user */
+ struct led_classdev mpled_cdev; /* LED class */
+};
+
+/*
+ * Timer event - blinks LED before user takes control over it
+ * with the first access via sysfs.
+ */
+static void mpled_timer_toggle(unsigned long data)
+{
+ struct motionpro_led *mpled = (struct motionpro_led *)data;
+
+ spin_lock_bh(&mpled->led_lock);
+ if (mpled->mode == LED_MODE_KERNEL) {
+ u32 val = in_be32(&mpled->gpt->mode);
+ val ^= LED_ON;
+ out_be32(&mpled->gpt->mode, val);
+
+ mod_timer(&mpled->blink_timer,
+ jiffies + msecs_to_jiffies(mpled->blink_delay));
+ }
+ spin_unlock_bh(&mpled->led_lock);
+}
+
+/*
+ * Turn on/off led according to user settings in sysfs.
+ * First call to this function disables kernel blinking.
+ */
+static void mpled_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ struct motionpro_led *mpled;
+ int old_mode;
+ u32 val;
+
+ mpled = container_of(led_cdev, struct motionpro_led, mpled_cdev);
+
+ spin_lock_bh(&mpled->led_lock);
+ /* disable kernel controll */
+ old_mode = mpled->mode;
+ if (old_mode == LED_MODE_KERNEL)
+ mpled->mode = LED_MODE_USER;
+
+ val = in_be32(&mpled->gpt->mode);
+ if (brightness)
+ val |= LED_ON;
+ else
+ val &= ~LED_ON;
+ out_be32(&mpled->gpt->mode, val);
+ spin_unlock_bh(&mpled->led_lock);
+
+ /* delete kernel mode blink timer, not needed anymore */
+ if ((old_mode == LED_MODE_KERNEL) && mpled->blink_delay)
+ del_timer(&mpled->blink_timer);
+}
+
+static void mpled_init_led(void __iomem *gpt_mode)
+{
+ u32 val = in_be32(gpt_mode);
+ val |= MPC52xx_GPT_ENABLE_OUTPUT;
+ val &= ~LED_ON;
+ out_be32(gpt_mode, val);
+}
+
+static int __devinit mpled_probe(struct of_device *op,
+ const struct of_device_id *match)
+{
+ struct motionpro_led *mpled;
+ const unsigned int *of_blink_delay;
+ const char *label;
+ int err;
+
+ dev_dbg(&op->dev, "mpled_probe: node=%s (op=%p, match=%p)\n",
+ op->node->name, op, match);
+
+ mpled = kzalloc(sizeof(*mpled), GFP_KERNEL);
+ if (!mpled)
+ return -ENOMEM;
+
+ mpled->gpt = mpc52xx_map_node(op->node);
+ if (!mpled->gpt) {
+ printk(KERN_ERR __FILE__ ": "
+ "Error mapping GPT registers for LED %s\n",
+ op->node->full_name);
+ err = -EIO;
+ goto err_free;
+ }
+
+ /* initialize GPT for LED use */
+ mpled_init_led(&mpled->gpt->mode);
+
+ spin_lock_init(&mpled->led_lock);
+ mpled->mode = LED_MODE_KERNEL;
+
+ /* get LED label, used to register led classdev */
+ label = of_get_property(op->node, "label", NULL);
+ if (label == NULL) {
+ printk(KERN_ERR __FILE__ ": "
+ "No label property provided for LED %s\n",
+ op->node->full_name);
+ err = -EINVAL;
+ goto err_free;
+ }
+ dev_dbg(&op->dev, "mpled_probe: label = '%s'\n", label);
+
+ /* get 'blink-delay' property if present */
+ of_blink_delay = of_get_property(op->node, "blink-delay", NULL);
+ mpled->blink_delay = of_blink_delay ? *of_blink_delay : 0;
+ dev_dbg(&op->dev, "mpled_probe: blink_delay = %d msec\n",
+ mpled->blink_delay);
+
+ /* initialize kernel blink_timer if blink_delay was provided */
+ if (mpled->blink_delay) {
+ init_timer(&mpled->blink_timer);
+ mpled->blink_timer.function = mpled_timer_toggle;
+ mpled->blink_timer.data = (unsigned long)mpled;
+
+ mod_timer(&mpled->blink_timer,
+ jiffies + msecs_to_jiffies(mpled->blink_delay));
+ }
+
+ /* register LED classdev */
+ mpled->mpled_cdev.name = label;
+ mpled->mpled_cdev.brightness_set = mpled_set;
+ mpled->mpled_cdev.default_trigger = "timer";
+
+ err = led_classdev_register(NULL, &mpled->mpled_cdev);
+ if (err) {
+ printk(KERN_ERR __FILE__ ": "
+ "Error registering class device for LED %s\n",
+ op->node->full_name);
+ goto err;
+ }
+
+ dev_set_drvdata(&op->dev, mpled);
+ return 0;
+
+err:
+ if (mpled->blink_delay)
+ del_timer(&mpled->blink_timer);
+ iounmap(mpled->gpt);
+err_free:
+ kfree(mpled);
+
+ return err;
+}
+
+static int mpled_remove(struct of_device *op)
+{
+ struct motionpro_led *mpled = dev_get_drvdata(&op->dev);
+
+ dev_dbg(&op->dev, "mpled_remove: (%p)\n", op);
+
+ if (mpled->blink_delay && (mpled->mode == LED_MODE_KERNEL))
+ del_timer(&mpled->blink_timer);
+
+ led_classdev_unregister(&mpled->mpled_cdev);
+
+ iounmap(mpled->gpt);
+ kfree(mpled);
+
+ return 0;
+}
+
+static struct of_device_id mpled_match[] = {
+ { .compatible = "promess,motionpro-led", },
+ {},
+};
+
+static struct of_platform_driver mpled_driver = {
+ .match_table = mpled_match,
+ .probe = mpled_probe,
+ .remove = mpled_remove,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "leds-motionpro",
+ },
+};
+
+static int __init mpled_init(void)
+{
+ return of_register_platform_driver(&mpled_driver);
+}
+
+static void __exit mpled_exit(void)
+{
+ of_unregister_platform_driver(&mpled_driver);
+}
+
+module_init(mpled_init);
+module_exit(mpled_exit);
+
+MODULE_LICENSE("GPL")
+MODULE_DESCRIPTION("Motion-PRO LED driver");
+MODULE_AUTHOR("Jan Wrobel <wrr at semihalf.com>");
+MODULE_AUTHOR("Marian Balakowicz <m8 at semihalf.com>");
diff --git a/include/asm-powerpc/mpc52xx.h b/include/asm-powerpc/mpc52xx.h
index 1887b13..d8e4ada 100644
--- a/include/asm-powerpc/mpc52xx.h
+++ b/include/asm-powerpc/mpc52xx.h
@@ -147,6 +147,11 @@ struct mpc52xx_gpio {
#define MPC52xx_GPIO_PSC_CONFIG_UART_WITH_CD 5
#define MPC52xx_GPIO_PCI_DIS (1<<15)
+/* Enables GPT register to operate as simple GPIO output register */
+#define MPC52xx_GPT_ENABLE_OUTPUT 0x00000024
+/* Puts 1 on GPT output pin */
+#define MPC52xx_GPT_OUTPUT_1 0x00000010
+
/* GPIO with WakeUp*/
struct mpc52xx_gpio_wkup {
u8 wkup_gpioe; /* GPIO_WKUP + 0x00 */
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