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path: root/drivers/video/backlight/da9052_bl.c
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Diffstat (limited to 'drivers/video/backlight/da9052_bl.c')
-rw-r--r--drivers/video/backlight/da9052_bl.c439
1 files changed, 439 insertions, 0 deletions
diff --git a/drivers/video/backlight/da9052_bl.c b/drivers/video/backlight/da9052_bl.c
new file mode 100644
index 000000000000..5cfcb471d337
--- /dev/null
+++ b/drivers/video/backlight/da9052_bl.c
@@ -0,0 +1,439 @@
+/*
+ * Copyright(c) 2009 Dialog Semiconductor Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * da9052_bl.c: Backlight driver for DA9052
+ */
+
+#include <linux/platform_device.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/reg.h>
+#include <linux/mfd/da9052/bl.h>
+
+
+#define DRIVER_NAME "da9052-backlight"
+#define DRIVER_NAME1 "WLED-1"
+#define DRIVER_NAME2 "WLED-2"
+#define DRIVER_NAME3 "WLED-3"
+
+/* These flags define if Backlight LEDs are present */
+/* Set the following macros to 1, if LEDs are present. Otherwise set to 0 */
+#define DA9052_LED1_PRESENT 1
+#define DA9052_LED2_PRESENT 1
+#define DA9052_LED3_PRESENT 1
+
+#define DA9052_MAX_BRIGHTNESS 0xA0/*0xFF*/
+
+struct da9052_backlight_data {
+ struct device *da9052_dev;
+ int current_brightness;
+ struct da9052 *da9052;
+
+ int is_led1_present;
+ int is_led2_present;
+ int is_led3_present;
+};
+
+enum da9052_led_number {
+ LED1 = 1,
+ LED2,
+ LED3,
+};
+
+static int da9052_backlight_brightness_set(struct da9052_backlight_data *data,
+ int brightness, enum da9052_led_number led)
+{
+ /*
+ * Mechanism for brightness control:
+ * For brightness control, current is used.
+ * PWM feature is not used.
+ * To use PWM feature, a fixed value of current should be defined.
+ */
+
+ int ret = 0;
+
+ unsigned int led_ramp_bit;
+ unsigned int led_current_register;
+ unsigned int led_current_sink_bit;
+ unsigned int led_boost_en_bit;
+
+ struct da9052_ssc_msg msg;
+
+ switch (led) {
+ case LED1:
+ led_ramp_bit = DA9052_LEDCONT_LED1RAMP;
+ led_current_register = DA9052_LED1CONF_REG;
+ led_current_sink_bit = DA9052_LEDCONT_LED1EN;
+ led_boost_en_bit = DA9052_BOOST_LED1INEN;
+ break;
+ case LED2:
+ led_ramp_bit = DA9052_LEDCONT_LED2RAMP;
+ led_current_register = DA9052_LED2CONF_REG;
+ led_current_sink_bit = DA9052_LEDCONT_LED2EN;
+ led_boost_en_bit = DA9052_BOOST_LED2INEN;
+ break;
+ case LED3:
+ led_ramp_bit = DA9052_LEDCONT_LED3RAMP;
+ led_current_register = DA9052_LED3CONF_REG;
+ led_current_sink_bit = DA9052_LEDCONT_LED3EN;
+ led_boost_en_bit = DA9052_BOOST_LED3INEN;
+ break;
+ default:
+ return -EIO;
+ }
+
+ /*
+ * 3 registers to be written
+ * 1. LED current for brightness
+ * 2. LED enable/disable depending on the brightness
+ * 3. BOOST enable/disable depending on the brightness
+ */
+
+ /* Configure LED current i.e. brightness */
+ msg.addr = led_current_register;
+ msg.data = brightness;
+ /* Write to the DA9052 register */
+ da9052_lock(data->da9052);
+ ret = data->da9052->write(data->da9052, &msg);
+ if (ret) {
+ da9052_unlock(data->da9052);
+ return ret;
+ }
+ da9052_unlock(data->da9052);
+
+ /*
+ * Check if brightness = 0
+ * and decide if led to be disabled
+ */
+ msg.addr = DA9052_LEDCONT_REG;
+ msg.data = 0;
+
+ /* Read LED_CONT register */
+ da9052_lock(data->da9052);
+ ret = data->da9052->read(data->da9052, &msg);
+ if (ret) {
+ da9052_unlock(data->da9052);
+ return ret;
+ }
+ da9052_unlock(data->da9052);
+
+ /* Set/Clear the LED current sink bit */
+ msg.data = brightness ? (msg.data | led_current_sink_bit) :
+ (msg.data & ~(led_current_sink_bit));
+ /* Disable current ramping */
+ msg.data = (msg.data & ~(led_ramp_bit));
+
+ /* Write to the DA9052 register */
+ da9052_lock(data->da9052);
+ ret = data->da9052->write(data->da9052, &msg);
+ if (ret) {
+ da9052_unlock(data->da9052);
+ return ret;
+ }
+ da9052_unlock(data->da9052);
+
+ /* Configure BOOST */
+ msg.addr = DA9052_BOOST_REG;
+ msg.data = 0;
+
+ /* Read LED_CONT register */
+ da9052_lock(data->da9052);
+ ret = data->da9052->read(data->da9052, &msg);
+ if (ret) {
+ da9052_unlock(data->da9052);
+ return ret;
+ }
+ da9052_unlock(data->da9052);
+
+ /* Set/Clear the LED BOOST enable bit */
+ msg.data = brightness ? (msg.data | led_boost_en_bit) :
+ (msg.data & ~(led_boost_en_bit));
+ /* Set/Clear the BOOST converter enable bit */
+
+ if (0 == (data->is_led1_present | data->is_led2_present |
+ data->is_led3_present)) {
+ msg.data = msg.data & ~(DA9052_BOOST_BOOSTEN);
+ } else
+ msg.data = (msg.data | DA9052_BOOST_BOOSTEN);
+
+ /* Write to the DA9052 register */
+ da9052_lock(data->da9052);
+ ret = data->da9052->write(data->da9052, &msg);
+ if (ret) {
+ da9052_unlock(data->da9052);
+ return ret;
+ }
+ da9052_unlock(data->da9052);
+
+ return 0;
+}
+
+static int da9052_backlight_set(struct backlight_device *bl, int brightness)
+{
+ struct da9052_backlight_data *data = bl_get_data(bl);
+ int ret = 0;
+ /* Check for LED1 */
+ if (1 == data->is_led1_present) {
+ ret = da9052_backlight_brightness_set(data, brightness, LED1);
+ if (ret)
+ return ret;
+ }
+ /* Check for LED2 */
+ if (1 == data->is_led2_present) {
+ ret = da9052_backlight_brightness_set(data, brightness, LED2);
+ if (ret)
+ return ret;
+ }
+ /* Check for LED3 */
+ if (1 == data->is_led3_present) {
+ ret = da9052_backlight_brightness_set(data, brightness, LED3);
+ if (ret)
+ return ret;
+ }
+
+ data->current_brightness = brightness;
+ return 0;
+}
+
+static int da9052_backlight_update_status(struct backlight_device *bl)
+{
+ int brightness = bl->props.brightness;
+
+ if (bl->props.power != FB_BLANK_UNBLANK)
+ brightness = 0;
+
+ if (bl->props.fb_blank != FB_BLANK_UNBLANK)
+ brightness = 0;
+ return da9052_backlight_set(bl, brightness);
+}
+
+static int da9052_backlight_get_brightness(struct backlight_device *bl)
+{
+ struct da9052_backlight_data *data = bl_get_data(bl);
+ return data->current_brightness;
+}
+
+struct backlight_ops da9052_backlight_ops = {
+ .update_status = da9052_backlight_update_status,
+ .get_brightness = da9052_backlight_get_brightness,
+};
+
+static int da9052_backlight_probe1(struct platform_device *pdev)
+{
+ struct da9052_backlight_data *data;
+ struct backlight_device *bl;
+ struct backlight_properties props;
+ struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent);
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (data == NULL)
+ return -ENOMEM;
+ data->da9052_dev = pdev->dev.parent;
+ data->da9052 = da9052;
+ data->current_brightness = 0;
+
+ data->is_led1_present = DA9052_LED1_PRESENT;
+
+ bl = backlight_device_register(pdev->name, data->da9052_dev,
+ data, &da9052_backlight_ops, &props);
+#if 0 /* Commented to be integrated with 2.6.28 kernel */
+ bl = backlight_device_register(pdev->name, data->da9052_dev,
+ data, &da9052_backlight_ops);
+#endif
+ if (IS_ERR(bl)) {
+ dev_err(&pdev->dev, "failed to register backlight\n");
+ kfree(data);
+ return PTR_ERR(bl);
+ }
+
+ bl->props.max_brightness = DA9052_MAX_BRIGHTNESS;
+ bl->props.brightness = 0;
+ bl->props.power = FB_BLANK_UNBLANK;
+ bl->props.fb_blank = FB_BLANK_UNBLANK;
+ platform_set_drvdata(pdev, bl);
+
+ backlight_update_status(bl);
+
+ /*
+ * NOTE:
+ * The default settings for DA9052 registers depends upon OTP values.
+ * E.g. The configuration of BOOST register, minimum value for LED
+ * current etc. are taken from OTP
+ */
+
+ return 0;
+}
+static int da9052_backlight_probe2(struct platform_device *pdev)
+{
+ struct da9052_backlight_data *data;
+ struct backlight_device *bl;
+ struct backlight_properties props;
+ struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent);
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (data == NULL)
+ return -ENOMEM;
+ data->da9052_dev = pdev->dev.parent;
+ data->da9052 = da9052;
+ data->current_brightness = 0;
+
+ data->is_led2_present = DA9052_LED2_PRESENT;
+ bl = backlight_device_register(pdev->name, data->da9052_dev,
+ data, &da9052_backlight_ops, &props);
+ if (IS_ERR(bl)) {
+ dev_err(&pdev->dev, "failed to register backlight\n");
+ kfree(data);
+ return PTR_ERR(bl);
+ }
+
+ bl->props.max_brightness = DA9052_MAX_BRIGHTNESS;
+ bl->props.brightness = 0;
+ bl->props.power = FB_BLANK_UNBLANK;
+ bl->props.fb_blank = FB_BLANK_UNBLANK;
+ platform_set_drvdata(pdev, bl);
+
+ backlight_update_status(bl);
+
+ /*
+ * NOTE:
+ * The default settings for DA9052 registers depends upon OTP values.
+ * E.g. The configuration of BOOST register, minimum value for LED
+ * current etc. are taken from OTP
+ */
+
+ return 0;
+}
+static int da9052_backlight_probe3(struct platform_device *pdev)
+{
+ struct da9052_backlight_data *data;
+ struct backlight_device *bl;
+ struct backlight_properties props;
+
+ struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent);
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (data == NULL)
+ return -ENOMEM;
+ data->da9052_dev = pdev->dev.parent;
+ data->da9052 = da9052;
+ data->current_brightness = 0;
+
+ data->is_led3_present = DA9052_LED3_PRESENT;
+ bl = backlight_device_register(pdev->name, data->da9052_dev,
+ data, &da9052_backlight_ops, &props);
+ if (IS_ERR(bl)) {
+ dev_err(&pdev->dev, "failed to register backlight\n");
+ kfree(data);
+ return PTR_ERR(bl);
+ }
+
+ bl->props.max_brightness = DA9052_MAX_BRIGHTNESS;
+ bl->props.brightness = 0;
+ bl->props.power = FB_BLANK_UNBLANK;
+ bl->props.fb_blank = FB_BLANK_UNBLANK;
+ platform_set_drvdata(pdev, bl);
+
+ backlight_update_status(bl);
+
+ /*
+ * NOTE:
+ * The default settings for DA9052 registers depends upon OTP values.
+ * E.g. The configuration of BOOST register, minimum value for LED
+ * current etc. are taken from OTP
+ */
+
+ return 0;
+}
+
+static int da9052_backlight_remove1(struct platform_device *pdev)
+{
+ struct backlight_device *bl = platform_get_drvdata(pdev);
+ struct da9052_backlight_data *data = bl_get_data(bl);
+
+ backlight_device_unregister(bl);
+ kfree(data);
+ return 0;
+}
+
+static int da9052_backlight_remove2(struct platform_device *pdev)
+{
+ struct backlight_device *bl = platform_get_drvdata(pdev);
+ struct da9052_backlight_data *data = bl_get_data(bl);
+
+ backlight_device_unregister(bl);
+ kfree(data);
+ return 0;
+}
+static int da9052_backlight_remove3(struct platform_device *pdev)
+{
+ struct backlight_device *bl = platform_get_drvdata(pdev);
+ struct da9052_backlight_data *data = bl_get_data(bl);
+
+ backlight_device_unregister(bl);
+ kfree(data);
+ return 0;
+}
+
+static struct platform_driver da9052_backlight_driver1 = {
+ .driver = {
+ .name = DRIVER_NAME1,
+ .owner = THIS_MODULE,
+ },
+ .probe = da9052_backlight_probe1,
+ .remove = da9052_backlight_remove1,
+};
+static struct platform_driver da9052_backlight_driver2 = {
+ .driver = {
+ .name = DRIVER_NAME2,
+ .owner = THIS_MODULE,
+ },
+ .probe = da9052_backlight_probe2,
+ .remove = da9052_backlight_remove2,
+};
+static struct platform_driver da9052_backlight_driver3 = {
+ .driver = {
+ .name = DRIVER_NAME3,
+ .owner = THIS_MODULE,
+ },
+ .probe = da9052_backlight_probe3,
+ .remove = da9052_backlight_remove3,
+};
+
+static int __init da9052_backlight_init(void)
+{
+ s32 ret;
+ ret = platform_driver_register(&da9052_backlight_driver1);
+ if (ret)
+ return ret;
+ ret = platform_driver_register(&da9052_backlight_driver2);
+ if (ret)
+ return ret;
+
+ ret = platform_driver_register(&da9052_backlight_driver3);
+ if (ret)
+ return ret;
+
+ return ret;
+}
+module_init(da9052_backlight_init);
+
+static void __exit da9052_backlight_exit(void)
+{
+ platform_driver_unregister(&da9052_backlight_driver1);
+ platform_driver_unregister(&da9052_backlight_driver2);
+ platform_driver_unregister(&da9052_backlight_driver3);
+}
+module_exit(da9052_backlight_exit);
+
+MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
+MODULE_DESCRIPTION("Backlight driver for Dialog DA9052 PMIC");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRIVER_NAME);
+
generated by cgit v1.2.3 (git 2.0.4) at 2024-05-23 03:06:23 +0000