Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752705AbbKBFZ7 (ORCPT ); Mon, 2 Nov 2015 00:25:59 -0500 Received: from arroyo.ext.ti.com ([192.94.94.40]:44508 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751783AbbKBFY6 (ORCPT ); Mon, 2 Nov 2015 00:24:58 -0500 From: Milo Kim To: , , CC: Milo Kim , Jingoo Han Subject: [PATCH RESEND 09/16] backlight: ti-lmu-backlight: add LM3631 driver Date: Mon, 2 Nov 2015 14:24:28 +0900 Message-ID: <1446441875-1256-10-git-send-email-milo.kim@ti.com> X-Mailer: git-send-email 1.9.5.msysgit.0 In-Reply-To: <1446441875-1256-1-git-send-email-milo.kim@ti.com> References: <1446441875-1256-1-git-send-email-milo.kim@ti.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6028 Lines: 192 LM3631 has 2 backlight strings and 11 bit dimming is supported. PWM brightness control is also supported. Common backlight driver is controlled by TI LMU backlight driver. Only LM3631 specific code is implemented here. Cc: Jingoo Han Cc: Lee Jones Cc: linux-kernel@vger.kernel.org Signed-off-by: Milo Kim --- drivers/video/backlight/Kconfig | 9 +++ drivers/video/backlight/Makefile | 1 + drivers/video/backlight/lm3631_bl.c | 129 ++++++++++++++++++++++++++++++++++++ 3 files changed, 139 insertions(+) create mode 100644 drivers/video/backlight/lm3631_bl.c diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 86d7946..986842e 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -399,6 +399,15 @@ config BACKLIGHT_LM3532 Up to 3 backlight strings and 8 bit dimming is supported. PWM brightness control is also supported. +config BACKLIGHT_LM3631 + tristate "Backlight driver for TI LM3631" + depends on BACKLIGHT_CLASS_DEVICE && MFD_TI_LMU + select TI_LMU_BACKLIGHT + help + Say Y to enable the backlight driver for TI LM3631. + Up to 2 backlight strings and 11 bit dimming is supported. + PWM brightness control is also supported. + config TI_LMU_BACKLIGHT tristate "Backlight driver for TI LMU" depends on BACKLIGHT_LM3532 || BACKLIGHT_LM3631 || \ diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index e037f57..e8891e8 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -39,6 +39,7 @@ obj-$(CONFIG_BACKLIGHT_IPAQ_MICRO) += ipaq_micro_bl.o obj-$(CONFIG_BACKLIGHT_LM3532) += lm3532_bl.o obj-$(CONFIG_BACKLIGHT_LM3533) += lm3533_bl.o obj-$(CONFIG_BACKLIGHT_LM3630A) += lm3630a_bl.o +obj-$(CONFIG_BACKLIGHT_LM3631) += lm3631_bl.o obj-$(CONFIG_BACKLIGHT_LM3639) += lm3639_bl.o obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o obj-$(CONFIG_BACKLIGHT_LP855X) += lp855x_bl.o diff --git a/drivers/video/backlight/lm3631_bl.c b/drivers/video/backlight/lm3631_bl.c new file mode 100644 index 0000000..1a914e5 --- /dev/null +++ b/drivers/video/backlight/lm3631_bl.c @@ -0,0 +1,129 @@ +/* + * TI LM3631 Backlight Driver + * + * Copyright 2015 Texas Instruments + * + * Author: Milo Kim + * + * 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 +#include +#include +#include + +#include "ti-lmu-backlight.h" + +/* Default backlight mode: PWM x I2C before sloping */ +#define LM3631_DEFAULT_MODE LM3631_MODE_COMB1 +#define LM3631_FULL_STRINGS (LMU_HVLED1 | LMU_HVLED2) +#define LM3631_MAX_BRIGHTNESS 2047 + +static int lm3631_bl_init(struct ti_lmu_bl_chip *chip) +{ + /* Set the brightness mode to 'comb1' by default */ + return ti_lmu_update_bits(chip->lmu, LM3631_REG_BRT_MODE, + LM3631_MODE_MASK, LM3631_DEFAULT_MODE); +} + +static int lm3631_bl_enable(struct ti_lmu_bl *lmu_bl, int enable) +{ + return ti_lmu_update_bits(lmu_bl->chip->lmu, LM3631_REG_DEVCTRL, + LM3631_BL_EN_MASK, enable); +} + +static int lm3631_bl_set_brightness(struct ti_lmu_bl *lmu_bl, int brightness) +{ + u8 data; + int ret; + + if (lmu_bl->mode == BL_PWM_BASED) + return 0; + + data = brightness & LM3631_BRT_LSB_MASK; + ret = ti_lmu_update_bits(lmu_bl->chip->lmu, LM3631_REG_BRT_LSB, + LM3631_BRT_LSB_MASK, data); + if (ret) + return ret; + + data = (brightness >> LM3631_BRT_MSB_SHIFT) & 0xFF; + return ti_lmu_write_byte(lmu_bl->chip->lmu, LM3631_REG_BRT_MSB, + data); +} + +static int lm3631_bl_string_configure(struct ti_lmu_bl *lmu_bl) +{ + u8 val; + + if (lmu_bl->bl_string == LM3631_FULL_STRINGS) + val = LM3631_BL_TWO_STRINGS; + else + val = LM3631_BL_ONE_STRING; + + return ti_lmu_update_bits(lmu_bl->chip->lmu, LM3631_REG_BL_CFG, + LM3631_BL_STRING_MASK, val); +} + +static int lm3631_bl_configure(struct ti_lmu_bl *lmu_bl) +{ + int ret; + int index; + + ret = lm3631_bl_string_configure(lmu_bl); + if (ret) + return ret; + + /* Set exponential mapping */ + ret = ti_lmu_update_bits(lmu_bl->chip->lmu, LM3631_REG_BL_CFG, + LM3631_MAP_MASK, LM3631_EXPONENTIAL_MAP); + if (ret) + return ret; + + /* Enable slope bit before updating slope time value */ + ret = ti_lmu_update_bits(lmu_bl->chip->lmu, LM3631_REG_BRT_MODE, + LM3631_EN_SLOPE_MASK, LM3631_EN_SLOPE_MASK); + if (ret) + return ret; + + /* Slope time configuration */ + index = ti_lmu_backlight_get_ramp_index(lmu_bl, BL_RAMP_UP); + if (index > 0) { + ret = ti_lmu_update_bits(lmu_bl->chip->lmu, LM3631_REG_SLOPE, + LM3631_SLOPE_MASK, + index << LM3631_SLOPE_SHIFT); + if (ret) + return ret; + } + + return 0; +} + +/* Backlight ramp up time. Unit is msec. */ +static const int lm3631_ramp_table[] = { + 0, 1, 2, 5, 10, 20, 50, 100, + 250, 500, 750, 1000, 1500, 2000, 3000, 4000, +}; + +static const struct ti_lmu_bl_ops lm3631_lmu_ops = { + .init = lm3631_bl_init, + .configure = lm3631_bl_configure, + .update_brightness = lm3631_bl_set_brightness, + .bl_enable = lm3631_bl_enable, + .max_brightness = LM3631_MAX_BRIGHTNESS, + .ramp_table = lm3631_ramp_table, + .size_ramp = ARRAY_SIZE(lm3631_ramp_table), +}; + +/* LM3631 backlight of_device_id */ +TI_LMU_BL_OF_DEVICE(lm3631, "ti,lm3631-backlight"); + +/* LM3631 backlight platform driver */ +TI_LMU_BL_PLATFORM_DRIVER(lm3631, "lm3631-backlight"); + +MODULE_DESCRIPTION("TI LM3631 Backlight Driver"); +MODULE_AUTHOR("Milo Kim"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:lm3631-backlight"); -- 1.9.1 -- 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/