[PATCH] led: enable led in 88pm860x
Haojian Zhuang
haojian.zhuang at marvell.com
Tue Nov 10 17:26:22 EST 2009
Enable led sub device in Marvell 88PM860x. Two LED arrays can be supported.
Each LED array can be used for R,G,B leds.
Signed-off-by: Haojian Zhuang <haojian.zhuang at marvell.com>
---
drivers/leds/Kconfig | 7 +
drivers/leds/Makefile | 1 +
drivers/leds/leds-88pm860x.c | 334 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 342 insertions(+), 0 deletions(-)
create mode 100644 drivers/leds/leds-88pm860x.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index e4f599f..49ec714 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -236,6 +236,13 @@ config LEDS_BD2802
This option enables support for BD2802GU RGB LED driver chips
accessed via the I2C bus.
+config LEDS_88PM860X
+ tristate "LED Support for Marvell 88PM860x PMIC"
+ depends on LEDS_CLASS && MFD_88PM860X
+ help
+ This option enables support for on-chip LED drivers found on Marvell
+ Semiconductor 88PM8606 PMIC.
+
comment "LED Triggers"
config LEDS_TRIGGERS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 46d7270..361ae38 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_LEDS_DA903X) += leds-da903x.o
obj-$(CONFIG_LEDS_WM831X_STATUS) += leds-wm831x-status.o
obj-$(CONFIG_LEDS_WM8350) += leds-wm8350.o
obj-$(CONFIG_LEDS_PWM) += leds-pwm.o
+obj-$(CONFIG_LEDS_88PM860X) += leds-88pm860x.o
# LED SPI Drivers
obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
diff --git a/drivers/leds/leds-88pm860x.c b/drivers/leds/leds-88pm860x.c
new file mode 100644
index 0000000..5160559
--- /dev/null
+++ b/drivers/leds/leds-88pm860x.c
@@ -0,0 +1,334 @@
+/*
+ * LED driver for Marvell 88PM860x
+ *
+ * Copyright (C) 2009 Marvell International Ltd.
+ * Haojian Zhuang <haojian.zhuang at marvell.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/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/mfd/88pm860x.h>
+
+#define LED_PWM_SHIFT (3)
+#define LED_PWM_MASK (0x1F)
+#define LED_CURRENT_MASK (0x07 << 5)
+
+#define LED_BLINK_ON_MASK (0x07)
+#define LED_BLINK_PERIOD_MASK (0x0F << 3)
+#define LED_BLINK_MASK (0x7F)
+
+#define LED_BLINK_ON(x) ((x & 0x7) * 66 + 66)
+#define LED_BLINK_PERIOD(x) ((x & 0xF) * 530 + 930)
+#define LED_BLINK_ON_MIN LED_BLINK_ON(0)
+#define LED_BLINK_ON_MAX LED_BLINK_ON(0x7)
+#define LED_BLINK_PERIOD_MIN LED_BLINK_PERIOD(0)
+#define LED_BLINK_PERIOD_MAX LED_BLINK_PERIOD(0xE)
+#define LED_TO_ON(x) ((x - 66) / 66)
+#define LED_TO_PERIOD(x) ((x - 930) / 530)
+
+#define LED1_BLINK_EN (1 << 1)
+#define LED2_BLINK_EN (1 << 2)
+
+struct pm860x_led {
+ struct led_classdev cdev;
+ struct i2c_client *i2c;
+ struct pm860x_chip *chip;
+ struct mutex lock;
+ char name[MFD_NAME_SIZE];
+ int port;
+ int iset;
+
+ int blink;
+ int blink_time;
+ int blink_on;
+ int blink_off;
+ int current_brightness;
+};
+
+/* return offset of color register */
+static inline int __led_off(int port)
+{
+ int ret = -EINVAL;
+
+ switch (port) {
+ case PM8606_LED1_RED:
+ case PM8606_LED1_GREEN:
+ case PM8606_LED1_BLUE:
+ ret = port - PM8606_LED1_RED + PM8606_RGB1B;
+ break;
+ case PM8606_LED2_RED:
+ case PM8606_LED2_GREEN:
+ case PM8606_LED2_BLUE:
+ ret = port - PM8606_LED2_RED + PM8606_RGB2B;
+ break;
+ }
+ return ret;
+}
+
+/* return offset of blink register */
+static inline int __blink_off(int port)
+{
+ int ret = -EINVAL;
+
+ switch (port) {
+ case PM8606_LED1_RED:
+ case PM8606_LED1_GREEN:
+ case PM8606_LED1_BLUE:
+ ret = PM8606_RGB1A;
+ case PM8606_LED2_RED:
+ case PM8606_LED2_GREEN:
+ case PM8606_LED2_BLUE:
+ ret = PM8606_RGB2A;
+ }
+ return ret;
+}
+
+static inline int __blink_ctl_mask(int port)
+{
+ int ret = -EINVAL;
+
+ switch (port) {
+ case PM8606_LED1_RED:
+ case PM8606_LED1_GREEN:
+ case PM8606_LED1_BLUE:
+ ret = LED1_BLINK_EN;
+ break;
+ case PM8606_LED2_RED:
+ case PM8606_LED2_GREEN:
+ case PM8606_LED2_BLUE:
+ ret = LED2_BLINK_EN;
+ break;
+ }
+ return ret;
+}
+
+static void pm860x_led_set(struct led_classdev *cdev,
+ enum led_brightness value)
+{
+ struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
+ struct pm860x_chip *chip = data->chip;
+ unsigned char brightness;
+ int offset;
+ int ret = -EINVAL;
+
+ offset = __led_off(data->port);
+
+ mutex_lock(&data->lock);
+ brightness = value >> 3;
+
+ if ((data->current_brightness == 0) && brightness) {
+ if (data->iset) {
+ ret = pm860x_set_bits(data->i2c, offset,
+ LED_CURRENT_MASK, data->iset);
+ if (ret < 0)
+ goto out;
+ }
+ }
+
+ ret = pm860x_set_bits(data->i2c, offset, LED_PWM_MASK, brightness);
+ if (ret < 0)
+ goto out;
+ mutex_unlock(&data->lock);
+
+ data->current_brightness = brightness;
+ dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
+ offset, brightness);
+ return;
+out:
+ mutex_unlock(&data->lock);
+ dev_err(chip->dev, "Fail on update LED. (reg:%d, brightness:%d)\n",
+ offset, brightness);
+ return;
+}
+
+static enum led_brightness pm860x_led_get(struct led_classdev *cdev)
+{
+ struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
+ struct pm860x_chip *chip = data->chip;
+ enum led_brightness brightness = LED_OFF;
+ int offset = 0, ret = -EINVAL;
+
+ offset = __led_off(data->port);
+
+ mutex_lock(&data->lock);
+ ret = pm860x_reg_read(data->i2c, offset);
+ if (ret < 0)
+ goto out;
+ ret &= LED_PWM_MASK;
+ if (ret >= (LED_FULL >> LED_PWM_SHIFT))
+ brightness = LED_FULL;
+ else if (ret < (LED_HALF >> LED_PWM_SHIFT))
+ brightness = LED_OFF;
+ else
+ brightness = LED_HALF;
+out:
+ mutex_unlock(&data->lock);
+ dev_dbg(chip->dev, "Read LED. (reg:%d, brightness:%d, ret:%d)\n",
+ offset, brightness, ret);
+ return brightness;
+}
+
+static int pm860x_led_blink(struct led_classdev *cdev,
+ unsigned long *delay_on,
+ unsigned long *delay_off)
+{
+ struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
+ struct pm860x_chip *chip = data->chip;
+ int period, on, offset, sum;
+ int ret = -EINVAL;
+
+ offset = __blink_off(data->port);
+
+ on = *delay_on;
+ if (on < LED_BLINK_ON_MIN)
+ on = LED_BLINK_ON_MIN;
+ if (on > LED_BLINK_ON_MAX)
+ on = LED_BLINK_ON_MAX;
+
+ on = LED_TO_ON(on);
+ on = LED_BLINK_ON(on);
+
+ period = on + *delay_off;
+ if (period < LED_BLINK_PERIOD_MIN)
+ period = LED_BLINK_PERIOD_MIN;
+ if (period > LED_BLINK_PERIOD_MAX)
+ period = LED_BLINK_PERIOD_MAX;
+ period = LED_TO_PERIOD(period);
+ period = LED_BLINK_PERIOD(period);
+
+ mutex_lock(&data->lock);
+ data->blink_on = on;
+ data->blink_off = period - data->blink_on;
+ sum = (period << 3) | data->blink_on;
+
+ ret = pm860x_set_bits(data->i2c, offset, LED_BLINK_MASK, sum);
+ if (ret < 0)
+ goto out;
+
+ offset = __blink_ctl_mask(data->port);
+ ret = pm860x_set_bits(data->i2c, PM8606_WLED3B, offset, offset);
+ if (ret < 0)
+ goto out;
+ mutex_unlock(&data->lock);
+
+ dev_dbg(chip->dev, "LED blink delay on:%dms, delay off:%dms\n",
+ data->blink_on, data->blink_off);
+ return 0;
+out:
+ mutex_unlock(&data->lock);
+ return ret;
+}
+
+static int __check_device(struct pm860x_led_pdata *pdata, char *name)
+{
+ struct pm860x_led_pdata *p = pdata;
+ int ret = -EINVAL;
+
+ while (p && p->id) {
+ if ((p->id != PM8606_ID_LED) || (p->flags < 0))
+ break;
+
+ if (!strncmp(name, pm860x_led_name[p->flags],
+ MFD_NAME_SIZE)) {
+ ret = (int)p->flags;
+ break;
+ }
+ p++;
+ }
+ return ret;
+}
+
+static int pm860x_led_probe(struct platform_device *pdev)
+{
+ struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
+ struct pm860x_platform_data *pm860x_pdata;
+ struct pm860x_led_pdata *pdata;
+ struct pm860x_led *data;
+ struct resource *res;
+ int ret;
+
+ res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "No I/O resource!\n");
+ return -EINVAL;
+ }
+
+ if (pdev->dev.parent->platform_data) {
+ pm860x_pdata = pdev->dev.parent->platform_data;
+ pdata = pm860x_pdata->led;
+ } else
+ pdata = NULL;
+
+ data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL);
+ if (data == NULL)
+ return -ENOMEM;
+ strncpy(data->name, res->name, MFD_NAME_SIZE);
+ dev_set_drvdata(&pdev->dev, data);
+ data->chip = chip;
+ data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
+ data->iset = pdata->iset;
+ data->port = __check_device(pdata, data->name);
+ if (data->port < 0)
+ return -EINVAL;
+
+ data->current_brightness = 0;
+ data->cdev.name = data->name;
+ data->cdev.brightness_set = pm860x_led_set;
+ data->cdev.brightness_get = pm860x_led_get;
+ data->cdev.blink_set = pm860x_led_blink;
+ mutex_init(&data->lock);
+
+ ret = led_classdev_register(chip->dev, &data->cdev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
+ goto out;
+ }
+ return 0;
+out:
+ kfree(data);
+ return ret;
+}
+
+static int pm860x_led_remove(struct platform_device *pdev)
+{
+ struct pm860x_led *data = platform_get_drvdata(pdev);
+
+ led_classdev_unregister(&data->cdev);
+ kfree(data);
+
+ return 0;
+}
+
+static struct platform_driver pm860x_led_driver = {
+ .driver = {
+ .name = "88pm860x-led",
+ .owner = THIS_MODULE,
+ },
+ .probe = pm860x_led_probe,
+ .remove = pm860x_led_remove,
+};
+
+static int __devinit pm860x_led_init(void)
+{
+ return platform_driver_register(&pm860x_led_driver);
+}
+module_init(pm860x_led_init);
+
+static void __devexit pm860x_led_exit(void)
+{
+ platform_driver_unregister(&pm860x_led_driver);
+}
+module_exit(pm860x_led_exit);
+
+MODULE_DESCRIPTION("LED driver for Marvell PM860x");
+MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang at marvell.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:88pm860x-led");
--
1.5.6.5
More information about the linux-arm-kernel
mailing list