diff options
Diffstat (limited to 'drivers/video/backlight/da9052_bl.c')
-rw-r--r-- | drivers/video/backlight/da9052_bl.c | 439 |
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); + |