TI LP8788 PMU has the current sink as the keyboard led driver.
The brightness is controlled by the i2c commands.
Configurable parameters can be defined in the platform side.
Signed-off-by: Milo(Woogyom) Kim <milo....@ti.com>
---
drivers/leds/Kconfig | 7 ++
drivers/leds/Makefile | 1 +
drivers/leds/leds-lp8788.c | 178 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 186 insertions(+), 0 deletions(-)
create mode 100644 drivers/leds/leds-lp8788.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index f028f03..a498deb 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -200,6 +200,13 @@ config LEDS_LP5523
Driver provides direct control via LED class and interface for
programming the engines.
+config LEDS_LP8788
+ tristate "LED support for the TI LP8788 PMIC"
+ depends on LEDS_CLASS
+ depends on MFD_LP8788
+ help
+ This option enables support for the Keyboard LEDs on the LP8788 PMIC.
+
config LEDS_CLEVO_MAIL
tristate "Mail LED on Clevo notebook"
depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 5eebd7b..f156193 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_LEDS_GPIO) += leds-gpio.o
obj-$(CONFIG_LEDS_LP3944) += leds-lp3944.o
obj-$(CONFIG_LEDS_LP5521) += leds-lp5521.o
obj-$(CONFIG_LEDS_LP5523) += leds-lp5523.o
+obj-$(CONFIG_LEDS_LP8788) += leds-lp8788.o
obj-$(CONFIG_LEDS_TCA6507) += leds-tca6507.o
obj-$(CONFIG_LEDS_CLEVO_MAIL) += leds-clevo-mail.o
obj-$(CONFIG_LEDS_HP6XX) += leds-hp6xx.o
diff --git a/drivers/leds/leds-lp8788.c b/drivers/leds/leds-lp8788.c
new file mode 100644
index 0000000..d92625e
--- /dev/null
+++ b/drivers/leds/leds-lp8788.c
@@ -0,0 +1,178 @@
+/*
+ * TI LP8788 MFD - keyled driver
+ *
+ * Copyright 2012 Texas Instruments
+ *
+ * Author: Milo(Woogyom) Kim <milo....@ti.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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/mfd/lp8788.h>
+#include <linux/mfd/lp8788-isink.h>
+
+#define MAX_BRIGHTNESS LP8788_ISINK_MAX_PWM
+#define DEFAULT_LED_NAME "keyboard-backlight"
+#define DEFAULT_ISINK_SCALE LP8788_ISINK_SCALE_100mA
+#define DEFAULT_ISINK_NUM LP8788_ISINK_3
+#define DEFAULT_ISINK_OUT 0
+
+struct lp8788_led {
+ struct lp8788 *lp;
+ struct led_classdev led_dev;
+ enum lp8788_isink_number isink_num;
+ int on;
+};
+
+static int lp8788_led_init_device(struct lp8788_led *led,
+ struct lp8788_led_platform_data *pdata)
+{
+ enum lp8788_isink_scale scale = DEFAULT_ISINK_SCALE;
+ enum lp8788_isink_number num = DEFAULT_ISINK_NUM;
+ int ret, iout = DEFAULT_ISINK_OUT;
+ u8 addr, mask, val;
+
+ if (pdata) {
+ scale = pdata->scale;
+ num = pdata->num;
+ iout = pdata->iout_code;
+ }
+
+ led->isink_num = num;
+
+ /* scale configuration */
+ addr = LP8788_ISINK_CTRL;
+ mask = 1 << (num + LP8788_ISINK_SCALE_OFFSET);
+ val = scale << num;
+ ret = lp8788_update_bits(led->lp, addr, mask, val);
+ if (ret)
+ return ret;
+
+ /* current configuration */
+ addr = lp8788_iout_addr[num];
+ mask = lp8788_iout_mask[num];
+ val = iout;
+
+ return lp8788_update_bits(led->lp, addr, mask, val);
+}
+
+static void lp8788_led_enable(struct lp8788_led *led,
+ enum lp8788_isink_number num, int on)
+{
+ u8 mask = 1 << num;
+ u8 val = on << num;
+
+ if (lp8788_update_bits(led->lp, LP8788_ISINK_CTRL, mask, val))
+ return;
+
+ led->on = on;
+}
+
+static void lp8788_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness brt_val)
+{
+ struct lp8788_led *led =
+ container_of(led_cdev, struct lp8788_led, led_dev);
+ enum lp8788_isink_number num = led->isink_num;
+ int enable;
+
+ switch (num) {
+ case LP8788_ISINK_1:
+ case LP8788_ISINK_2:
+ case LP8788_ISINK_3:
+ lp8788_write_byte(led->lp, lp8788_pwm_addr[num], brt_val);
+ break;
+ default:
+ return;
+ }
+
+ enable = (brt_val > 0) ? 1 : 0;
+
+ if (enable != led->on)
+ lp8788_led_enable(led, num, enable);
+}
+
+static __devinit int lp8788_led_probe(struct platform_device *pdev)
+{
+ struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
+ struct lp8788_led_platform_data *led_pdata;
+ struct lp8788_led *led;
+ int ret;
+
+ led = devm_kzalloc(lp->dev, sizeof(struct lp8788_led), GFP_KERNEL);
+ if (!led)
+ return -ENOMEM;
+
+ led->lp = lp;
+ led->led_dev.max_brightness = MAX_BRIGHTNESS;
+ led->led_dev.brightness_set = lp8788_brightness_set;
+
+ led_pdata = lp->pdata ? lp->pdata->led_pdata : NULL;
+
+ if (!led_pdata || !led_pdata->name)
+ led->led_dev.name = DEFAULT_LED_NAME;
+ else
+ led->led_dev.name = led_pdata->name;
+
+ platform_set_drvdata(pdev, led);
+
+ ret = lp8788_led_init_device(led, led_pdata);
+ if (ret) {
+ dev_err(lp->dev, "led init device err: %d\n", ret);
+ goto err_dev;
+ }
+
+ ret = led_classdev_register(lp->dev, &led->led_dev);
+ if (ret) {
+ dev_err(lp->dev, "led register err: %d\n", ret);
+ goto err_dev;
+ }
+
+ return 0;
+
+err_dev:
+ return ret;
+}
+
+static int __devexit lp8788_led_remove(struct platform_device *pdev)
+{
+ struct lp8788_led *led = platform_get_drvdata(pdev);
+
+ led_classdev_unregister(&led->led_dev);
+ platform_set_drvdata(pdev, NULL);
+ return 0;
+}
+
+static struct platform_driver lp8788_led_driver = {
+ .probe = lp8788_led_probe,
+ .remove = __devexit_p(lp8788_led_remove),
+ .driver = {
+ .name = LP8788_DEV_KEYLED,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init lp8788_led_init(void)
+{
+ return platform_driver_register(&lp8788_led_driver);
+}
+module_init(lp8788_led_init);
+
+static void __exit lp8788_led_exit(void)
+{
+ platform_driver_unregister(&lp8788_led_driver);
+}
+module_exit(lp8788_led_exit);
+
+MODULE_DESCRIPTION("Texas Instruments LP8788 Keyboard LED Driver");
+MODULE_AUTHOR("Milo Kim");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lp8788-keyled");
--
1.7.2.5
Best Regards,
Milo
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