[PATCH 09/11] [POWERPC] Motion-PRO: Add LED support.
Grant Likely
grant.likely at secretlab.ca
Thu Oct 25 00:18:01 EST 2007
On 10/23/07, Marian Balakowicz <m8 at semihalf.com> wrote:
> 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);
Please use of-platform-bus bindings instead. Let the of-platform bus
take care of scanning the tree for you. Don't do it manually.
> + 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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>
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
grant.likely at secretlab.ca
(403) 399-0195
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