[PATCH 09/11] [POWERPC] Motion-PRO: Add LED support.
Marian Balakowicz
m8 at semihalf.com
Wed Oct 24 09:13:58 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 | 222 +++++++++++++++++++++++++++++++++++++++++
include/asm-powerpc/mpc52xx.h | 5 +
4 files changed, 236 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..d4b872c
--- /dev/null
+++ b/drivers/leds/leds-motionpro.c
@@ -0,0 +1,222 @@
+/*
+ * LEDs driver for the Motionpro board.
+ *
+ * Copyright (C) 2007 Semihalf
+ *
+ * Author: Jan Wrobel <wrr 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
+ *
+ *
+ * This driver enables control over Motionpro's status and ready LEDs through
+ * sysfs. LEDs can be controlled by writing to sysfs files:
+ * class/leds/motionpro-(ready|status)led/(brightness|delay_off|delay_on).
+ * See Documentation/leds-class.txt for more details
+ *
+ * Before user issues first control command via sysfs, LED blinking is
+ * controlled by the kernel. By default status LED is blinking fast and ready
+ * LED is turned off.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/leds.h>
+
+#include <asm/mpc52xx.h>
+#include <asm/io.h>
+
+/* Led status */
+#define LED_NOT_REGISTERED 0
+#define LED_KERNEL_CONTROLLED 1
+#define LED_USER_CONTROLLED 2
+
+/* Led control bits */
+#define LED_ON MPC52xx_GPT_OUTPUT_1
+
+static void mpled_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness);
+
+struct motionpro_led{
+ /* Protects the led data */
+ spinlock_t led_lock;
+
+ /* Path to led's control register DTS node */
+ char *reg_compat;
+
+ /* Address to access led's register */
+ void __iomem *reg_addr;
+
+ int status;
+
+ /* Blinking timer used when led is controlled by the kernel */
+ struct timer_list kernel_mode_timer;
+
+ /*
+ * Delay between blinks when led is controlled by the kernel.
+ * If set to 0 led blinking is off.
+ */
+ int kernel_mode_delay;
+
+ struct led_classdev classdev;
+};
+
+static struct motionpro_led led[] = {
+ {
+ .reg_compat = "promess,motionpro-statusled",
+ .reg_addr = 0,
+ .led_lock = SPIN_LOCK_UNLOCKED,
+ .status = LED_NOT_REGISTERED,
+ .kernel_mode_delay = HZ / 10,
+ .classdev = {
+ .name = "motionpro-statusled",
+ .brightness_set = mpled_set,
+ .default_trigger = "timer",
+ },
+ },
+ {
+ .reg_compat = "promess,motionpro-readyled",
+ .reg_addr = 0,
+ .led_lock = SPIN_LOCK_UNLOCKED,
+ .status = LED_NOT_REGISTERED,
+ .kernel_mode_delay = 0,
+ .classdev = {
+ .name = "motionpro-readyled",
+ .brightness_set = mpled_set,
+ .default_trigger = "timer",
+ }
+ }
+};
+
+/* Timer event - blinks led before user takes control over it */
+static void mpled_timer_toggle(unsigned long ptr)
+{
+ struct motionpro_led *mled = (struct motionpro_led *) ptr;
+
+ spin_lock_bh(&mled->led_lock);
+ if (mled->status == LED_KERNEL_CONTROLLED){
+ u32 reg = in_be32(mled->reg_addr);
+ reg ^= LED_ON;
+ out_be32(mled->reg_addr, reg);
+ led->kernel_mode_timer.expires = jiffies +
+ led->kernel_mode_delay;
+ add_timer(&led->kernel_mode_timer);
+ }
+ spin_unlock_bh(&mled->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 *mled;
+ u32 reg;
+
+ mled = container_of(led_cdev, struct motionpro_led, classdev);
+
+ spin_lock_bh(&mled->led_lock);
+ mled->status = LED_USER_CONTROLLED;
+
+ reg = in_be32(mled->reg_addr);
+ if (brightness)
+ reg |= LED_ON;
+ else
+ reg &= ~LED_ON;
+ out_be32(mled->reg_addr, reg);
+
+ spin_unlock_bh(&mled->led_lock);
+}
+
+static void mpled_init_led(void __iomem *reg_addr)
+{
+ u32 reg = in_be32(reg_addr);
+ reg |= MPC52xx_GPT_ENABLE_OUTPUT;
+ reg &= ~LED_ON;
+ out_be32(reg_addr, reg);
+}
+
+static void mpled_clean(void)
+{
+ int i;
+ for (i = 0; i < sizeof(led) / sizeof(struct motionpro_led); i++){
+ if (led[i].status != LED_NOT_REGISTERED){
+ spin_lock_bh(&led[i].led_lock);
+ led[i].status = LED_NOT_REGISTERED;
+ spin_unlock_bh(&led[i].led_lock);
+ led_classdev_unregister(&led[i].classdev);
+ }
+ if (led[i].reg_addr){
+ iounmap(led[i].reg_addr);
+ led[i].reg_addr = 0;
+ }
+ }
+}
+
+static int __init mpled_init(void)
+{
+ int i, error;
+
+ for (i = 0; i < sizeof(led) / sizeof(struct motionpro_led); i++){
+ led[i].reg_addr = mpc52xx_find_and_map(led[i].reg_compat);
+ if (!led[i].reg_addr){
+ printk(KERN_ERR __FILE__ ": "
+ "Error while mapping GPIO register for LED %s\n",
+ led[i].classdev.name);
+ error = -EIO;
+ goto err;
+ }
+
+ mpled_init_led(led[i].reg_addr);
+ led[i].status = LED_KERNEL_CONTROLLED;
+ if (led[i].kernel_mode_delay){
+ init_timer(&led[i].kernel_mode_timer);
+ led[i].kernel_mode_timer.function = mpled_timer_toggle;
+ led[i].kernel_mode_timer.data = (unsigned long)&led[i];
+ led[i].kernel_mode_timer.expires =
+ jiffies + led[i].kernel_mode_delay;
+ add_timer(&led[i].kernel_mode_timer);
+ }
+
+ if ((error = led_classdev_register(NULL, &led[i].classdev)) < 0){
+ printk(KERN_ERR __FILE__ ": "
+ "Error while registering class device for LED "
+ "%s\n",
+ led[i].classdev.name);
+ goto err;
+ }
+ }
+
+ printk("Motionpro LEDs driver initialized\n");
+ return 0;
+err:
+ mpled_clean();
+ return error;
+}
+
+static void __exit mpled_exit(void)
+{
+ mpled_clean();
+}
+
+module_init(mpled_init);
+module_exit(mpled_exit);
+
+MODULE_LICENSE("GPL")
+MODULE_DESCRIPTION("LEDs support for Motionpro");
+MODULE_AUTHOR("Jan Wrobel <wrr at semihalf.com>");
diff --git a/include/asm-powerpc/mpc52xx.h b/include/asm-powerpc/mpc52xx.h
index 859ffb0..7e20f54 100644
--- a/include/asm-powerpc/mpc52xx.h
+++ b/include/asm-powerpc/mpc52xx.h
@@ -140,6 +140,11 @@ 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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