Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753727Ab1F1OUf (ORCPT ); Tue, 28 Jun 2011 10:20:35 -0400 Received: from tx2ehsobe004.messaging.microsoft.com ([65.55.88.14]:47356 "EHLO TX2EHSOBE008.bigfish.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758204Ab1F1OST (ORCPT ); Tue, 28 Jun 2011 10:18:19 -0400 X-SpamScore: 10 X-BigFish: VPS10(zzc8kzz1202h10d2nzz8275bhz32i2a8h668h839h61h) X-Spam-TCS-SCL: 0:0 X-Forefront-Antispam-Report: CIP:203.197.93.240;KIP:(null);UIP:(null);IPVD:NLI;H:Kcinpunhjhc01.kpit.com;RD:Kcinpunhjhc01.kpit.com;EFVD:NLI Subject: [PATCH 9/11] Backlight: DA9052 Backlight driver v1 From: ashishj3 Reply-To: To: CC: , , , Content-Type: text/plain; charset="cp1252" Date: Tue, 28 Jun 2011 19:48:12 +0530 Message-ID: <1309270692.376.227.camel@L-0532.kpit.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-OriginatorOrg: kpitcummins.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7569 Lines: 273 DA9052 PMIC has capability to supply power for upto 3 banks of 6 white serial LEDS. It can also control intensity of independent banks. To drive these banks boost converter will provide up to 24V and forward current of max. 50mA. This patch controls intensity of the individual WLEDs bank through DA9052 PMIC. Signed-off-by: David Dajun Chen Signed-off-by: Ashish Jangam --- drivers/video/backlight/Kconfig | 6 + drivers/video/backlight/Makefile | 1 + drivers/video/backlight/da9052_bl.c | 216 +++++++++++++++++++++++++++++++++++ 3 files changed, 223 insertions(+), 0 deletions(-) create mode 100755 drivers/video/backlight/da9052_bl.c diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 0c9373b..a14fb21 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -237,6 +237,12 @@ config BACKLIGHT_DA903X If you have a LCD backlight connected to the WLED output of DA9030 or DA9034 WLED output, say Y here to enable this driver. +config BACKLIGHT_DA9052 + tristate "Dialog DA9052 WLED" + depends on PMIC_DA9052 + help + Enable the DA9052 Backlight Driver + config BACKLIGHT_MAX8925 tristate "Backlight driver for MAX8925" depends on MFD_MAX8925 diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index b9ca849..a317e11 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -26,6 +26,7 @@ obj-$(CONFIG_BACKLIGHT_PROGEAR) += progear_bl.o obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o obj-$(CONFIG_BACKLIGHT_DA903X) += da903x_bl.o +obj-$(CONFIG_BACKLIGHT_DA9052) += da9052_bl.o obj-$(CONFIG_BACKLIGHT_MAX8925) += max8925_bl.o obj-$(CONFIG_BACKLIGHT_APPLE) += apple_bl.o obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o diff --git a/drivers/video/backlight/da9052_bl.c b/drivers/video/backlight/da9052_bl.c new file mode 100755 index 0000000..ed8b2f8 --- /dev/null +++ b/drivers/video/backlight/da9052_bl.c @@ -0,0 +1,216 @@ +/* + * Backlight Driver for Dialog DA9052 PMICs + * + * Copyright(c) 2011 Dialog Semiconductor Ltd. + * + * Author: David Dajun Chen + * + * 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. + * + */ + +#include +#include +#include +#include + +#include +#include + +#define DA9052_MAX_BRIGHTNESS 0xFF + +enum { + DA9052_WLEDS_OFF, + DA9052_WLEDS_ON, +}; + +static unsigned char wled_bank[] = { + DA9052_LED1_CONF_REG, + DA9052_LED2_CONF_REG, + DA9052_LED3_CONF_REG, +}; + +struct da9052_bl { + struct da9052 *da9052; + uint brightness; + uint state; + uint led_reg; +}; + +static int da9052_adjust_wled_brightness(struct da9052_bl *wleds) +{ + unsigned char boost_en; + unsigned char i_sink; + int ret; + + boost_en = 0x3F; + i_sink = 0xFF; + if (wleds->state == DA9052_WLEDS_OFF) { + boost_en = 0x00; + i_sink = 0x00; + } + + ret = da9052_reg_write(wleds->da9052, DA9052_BOOST_REG, boost_en); + if (ret < 0) { + dev_err(wleds->da9052->dev, + "Failed to write boost reg, %d\n", ret); + return ret; + } + + ret = da9052_reg_write(wleds->da9052, DA9052_LED_CONT_REG, i_sink); + if (ret < 0) { + dev_err(wleds->da9052->dev, + "Failed to write led cont reg, %d\n", ret); + return ret; + } + + ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg], 0x0); + if (ret < 0) { + dev_err(wleds->da9052->dev, + "Failed to write led conf reg, %d", ret); + return ret; + } + + if (wleds->brightness) { + msleep(10); + ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg], + wleds->brightness); + if (ret < 0) { + dev_err(wleds->da9052->dev, + "Failed to write led conf reg, %d", ret); + return ret; + } + } + + return 0; +} + +static int da9052_backlight_update_status(struct backlight_device *bl) +{ + int brightness = bl->props.brightness; + struct da9052_bl *wleds = bl_get_data(bl); + + wleds->brightness = brightness; + wleds->state = DA9052_WLEDS_ON; + + return da9052_adjust_wled_brightness(wleds); +} + +static int da9052_backlight_get_brightness(struct backlight_device *bl) +{ + struct da9052_bl *wleds = bl_get_data(bl); + + return wleds->brightness; +} + +static const struct backlight_ops da9052_backlight_ops = { + .update_status = da9052_backlight_update_status, + .get_brightness = da9052_backlight_get_brightness, +}; + +static int da9052_backlight_probe(struct platform_device *pdev) +{ + struct backlight_device *bl; + struct backlight_properties props; + static int led_reg_num; + struct da9052_bl *wleds; + + wleds = kzalloc(sizeof(struct da9052_bl), GFP_KERNEL); + if (!wleds) + return -ENOMEM; + + wleds->da9052 = dev_get_drvdata(pdev->dev.parent); + wleds->brightness = 0; + wleds->led_reg = led_reg_num++; + wleds->state = DA9052_WLEDS_OFF; + + bl = backlight_device_register(pdev->name, wleds->da9052->dev, wleds, + &da9052_backlight_ops, &props); + if (IS_ERR(bl)) { + dev_err(&pdev->dev, "Failed to register backlight\n"); + kfree(wleds); + return PTR_ERR(bl); + } + + bl->props.max_brightness = DA9052_MAX_BRIGHTNESS; + bl->props.brightness = 0; + platform_set_drvdata(pdev, bl); + + return da9052_adjust_wled_brightness(wleds); +} + +static int da9052_backlight_remove(struct platform_device *pdev) +{ + struct backlight_device *bl = platform_get_drvdata(pdev); + struct da9052_bl *wleds = bl_get_data(bl); + + wleds->brightness = 0; + wleds->state = DA9052_WLEDS_OFF; + da9052_adjust_wled_brightness(wleds); + backlight_device_unregister(bl); + + return 0; +} + +static struct platform_driver da9052_wled1_driver = { + .probe = da9052_backlight_probe, + .remove = da9052_backlight_remove, + .driver = { + .name = "da9052-WLED1", + .owner = THIS_MODULE, + }, +}; + +static struct platform_driver da9052_wled2_driver = { + .probe = da9052_backlight_probe, + .remove = da9052_backlight_remove, + .driver = { + .name = "da9052-WLED2", + .owner = THIS_MODULE, + }, +}; + +static struct platform_driver da9052_wled3_driver = { + .probe = da9052_backlight_probe, + .remove = da9052_backlight_remove, + .driver = { + .name = "da9052-WLED3", + .owner = THIS_MODULE, + }, +}; + +static int __init da9052_backlight_init(void) +{ + int ret; + + ret = platform_driver_register(&da9052_wled1_driver); + if (ret) + return ret; + + ret = platform_driver_register(&da9052_wled2_driver); + if (ret) + return ret; + + ret = platform_driver_register(&da9052_wled3_driver); + if (ret) + return ret; + + return 0; +} +module_init(da9052_backlight_init); + +static void __exit da9052_backlight_exit(void) +{ + platform_driver_unregister(&da9052_wled1_driver); + platform_driver_unregister(&da9052_wled2_driver); + platform_driver_unregister(&da9052_wled3_driver); +} +module_exit(da9052_backlight_exit); + +MODULE_AUTHOR("David Dajun Chen "); +MODULE_DESCRIPTION("Backlight driver for DA9052 PMIC"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:da9052-backlight"); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/