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[209.132.180.67]) by mx.google.com with ESMTP id j8si9512944pfh.239.2019.05.06.12.16.29; Mon, 06 May 2019 12:16:29 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-leds-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@ti.com header.s=ti-com-17Q1 header.b=Tjt7JkG6; spf=pass (google.com: best guess record for domain of linux-leds-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-leds-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=NONE dis=NONE) header.from=ti.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726352AbfEFTQ2 (ORCPT + 1 other); Mon, 6 May 2019 15:16:28 -0400 Received: from fllv0015.ext.ti.com ([198.47.19.141]:52828 "EHLO fllv0015.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726175AbfEFTQZ (ORCPT ); Mon, 6 May 2019 15:16:25 -0400 Received: from lelv0265.itg.ti.com ([10.180.67.224]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id x46JG9gb075436; Mon, 6 May 2019 14:16:09 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1557170169; bh=EOysHEmVprVHbA6cHKUPLGkNbCYJbZUuBPXeor5VM8A=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=Tjt7JkG6HNcnWS3G9wg3FhqCdiA4YJFgvAHC3g5/dLkqNnVft4I+7/DrJNsig3J+3 ESOjNdMRunO2U8SWC0apZR2Jx45SGEpaepW3C/8tPWn8esR9pL8/56Vw1/87pgtI81 YRFynWzKZXY51gyGrj8iwJ1Tgpw/tvKfTR3u6a2o= Received: from DFLE114.ent.ti.com (dfle114.ent.ti.com [10.64.6.35]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id x46JG932074985 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 6 May 2019 14:16:09 -0500 Received: from DFLE114.ent.ti.com (10.64.6.35) by DFLE114.ent.ti.com (10.64.6.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Mon, 6 May 2019 14:16:09 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DFLE114.ent.ti.com (10.64.6.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5 via Frontend Transport; Mon, 6 May 2019 14:16:09 -0500 Received: from localhost (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id x46JG9FH077967; Mon, 6 May 2019 14:16:09 -0500 From: Dan Murphy To: , CC: , , , , Dan Murphy Subject: [PATCH v4 4/7] leds: TI LMU: Add common code for TI LMU devices Date: Mon, 6 May 2019 14:16:11 -0500 Message-ID: <20190506191614.25051-5-dmurphy@ti.com> X-Mailer: git-send-email 2.21.0.5.gaeb582a983 In-Reply-To: <20190506191614.25051-1-dmurphy@ti.com> References: <20190506191614.25051-1-dmurphy@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-leds-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org Create a TI LMU common framework for TI LMU devices that share common features. Currently the runtime ramp and brightness setting have been identified as common features with common register settings. This work is derived from Milo Kims TI LMU MFD code. Acked-by: Pavel Machek Signed-off-by: Dan Murphy --- v4 - Renamed the files from ti-lmu-led-common to leds-ti-lmu-common, updated the ramp-up/down variable from ms->us, fixed Kconfig, updated common header name - https://lore.kernel.org/patchwork/patch/1068615/ v3 - No changes - https://lore.kernel.org/patchwork/patch/1058764/ v2 - Added support for the brightness resolution parameter as it is a global parameter for all LMU devices, no other changes were made - https://lore.kernel.org/patchwork/patch/1054500/ drivers/leds/Kconfig | 8 ++ drivers/leds/Makefile | 1 + drivers/leds/leds-ti-lmu-common.c | 156 +++++++++++++++++++++++++++++ include/linux/leds-ti-lmu-common.h | 47 +++++++++ 4 files changed, 212 insertions(+) create mode 100644 drivers/leds/leds-ti-lmu-common.c create mode 100644 include/linux/leds-ti-lmu-common.h -- 2.21.0.5.gaeb582a983 diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index da00b9ed5a5c..a88dad3be96c 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -776,6 +776,14 @@ config LEDS_NIC78BX To compile this driver as a module, choose M here: the module will be called leds-nic78bx. +config LEDS_TI_LMU_COMMON + tristate "LED driver for TI LMU" + depends on REGMAP + help + Say Y to enable the LED driver for TI LMU devices. + This supports common features between the TI LM3532, LM3631, LM3632, + LM3633, LM3695 and LM3697. + comment "LED Triggers" source "drivers/leds/trigger/Kconfig" diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 7a8b1f55d459..9d7cdd363603 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -80,6 +80,7 @@ obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o obj-$(CONFIG_LEDS_SC27XX_BLTC) += leds-sc27xx-bltc.o obj-$(CONFIG_LEDS_LM3601X) += leds-lm3601x.o +obj-$(CONFIG_LEDS_TI_LMU_COMMON) += leds-ti-lmu-common.o # LED SPI Drivers obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o diff --git a/drivers/leds/leds-ti-lmu-common.c b/drivers/leds/leds-ti-lmu-common.c new file mode 100644 index 000000000000..adc7293004f1 --- /dev/null +++ b/drivers/leds/leds-ti-lmu-common.c @@ -0,0 +1,156 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright 2015 Texas Instruments +// Copyright 2018 Sebastian Reichel +// Copyright 2018 Pavel Machek +// TI LMU LED common framework, based on previous work from +// Milo Kim + +#include +#include +#include + +#include + +const static int ramp_table[16] = {2048, 262000, 524000, 1049000, 2090000, + 4194000, 8389000, 16780000, 33550000, 41940000, + 50330000, 58720000, 67110000, 83880000, + 100660000, 117440000}; + +static int ti_lmu_common_update_brightness(struct ti_lmu_bank *lmu_bank, + int brightness) +{ + struct regmap *regmap = lmu_bank->regmap; + u8 reg, val; + int ret; + + /* + * Brightness register update + * + * 11 bit dimming: update LSB bits and write MSB byte. + * MSB brightness should be shifted. + * 8 bit dimming: write MSB byte. + */ + if (lmu_bank->max_brightness == MAX_BRIGHTNESS_11BIT) { + reg = lmu_bank->lsb_brightness_reg; + ret = regmap_update_bits(regmap, reg, + LMU_11BIT_LSB_MASK, + brightness); + if (ret) + return ret; + + val = brightness >> LMU_11BIT_MSB_SHIFT; + } else { + val = brightness; + } + + reg = lmu_bank->msb_brightness_reg; + + return regmap_write(regmap, reg, val); +} + +int ti_lmu_common_set_brightness(struct ti_lmu_bank *lmu_bank, int brightness) +{ + return ti_lmu_common_update_brightness(lmu_bank, brightness); +} +EXPORT_SYMBOL(ti_lmu_common_set_brightness); + +static int ti_lmu_common_convert_ramp_to_index(unsigned int usec) +{ + int size = ARRAY_SIZE(ramp_table); + int i; + + if (usec <= ramp_table[0]) + return 0; + + if (usec > ramp_table[size - 1]) + return size - 1; + + for (i = 1; i < size; i++) { + if (usec == ramp_table[i]) + return i; + + /* Find an approximate index by looking up the table */ + if (usec > ramp_table[i - 1] && usec < ramp_table[i]) { + if (usec - ramp_table[i - 1] < ramp_table[i] - usec) + return i - 1; + else + return i; + } + } + + return -EINVAL; +} + +int ti_lmu_common_set_ramp(struct ti_lmu_bank *lmu_bank) +{ + struct regmap *regmap = lmu_bank->regmap; + u8 ramp, ramp_up, ramp_down; + + if (lmu_bank->ramp_up_usec == 0 && lmu_bank->ramp_down_usec == 0) { + ramp_up = 0; + ramp_down = 0; + } else { + ramp_up = ti_lmu_common_convert_ramp_to_index(lmu_bank->ramp_up_usec); + ramp_down = ti_lmu_common_convert_ramp_to_index(lmu_bank->ramp_down_usec); + } + + if (ramp_up < 0 || ramp_down < 0) + return -EINVAL; + + ramp = (ramp_up << 4) | ramp_down; + + return regmap_write(regmap, lmu_bank->runtime_ramp_reg, ramp); + +} +EXPORT_SYMBOL(ti_lmu_common_set_ramp); + +int ti_lmu_common_get_ramp_params(struct device *dev, + struct fwnode_handle *child, + struct ti_lmu_bank *lmu_data) +{ + int ret; + + ret = fwnode_property_read_u32(child, "ramp-up-us", + &lmu_data->ramp_up_usec); + if (ret) + dev_warn(dev, "ramp-up-us property missing\n"); + + + ret = fwnode_property_read_u32(child, "ramp-down-us", + &lmu_data->ramp_down_usec); + if (ret) + dev_warn(dev, "ramp-down-us property missing\n"); + + return 0; +} +EXPORT_SYMBOL(ti_lmu_common_get_ramp_params); + +int ti_lmu_common_get_brt_res(struct device *dev, struct fwnode_handle *child, + struct ti_lmu_bank *lmu_data) +{ + int ret; + + ret = device_property_read_u32(dev, "ti,brightness-resolution", + &lmu_data->max_brightness); + if (ret) + ret = fwnode_property_read_u32(child, + "ti,brightness-resolution", + &lmu_data->max_brightness); + if (lmu_data->max_brightness <= 0) { + lmu_data->max_brightness = MAX_BRIGHTNESS_8BIT; + return ret; + } + + if (lmu_data->max_brightness > MAX_BRIGHTNESS_11BIT) + lmu_data->max_brightness = MAX_BRIGHTNESS_11BIT; + + + return 0; +} +EXPORT_SYMBOL(ti_lmu_common_get_brt_res); + +MODULE_DESCRIPTION("TI LMU common LED framework"); +MODULE_AUTHOR("Sebastian Reichel"); +MODULE_AUTHOR("Dan Murphy "); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("ti-lmu-led-common"); diff --git a/include/linux/leds-ti-lmu-common.h b/include/linux/leds-ti-lmu-common.h new file mode 100644 index 000000000000..5eb111f38803 --- /dev/null +++ b/include/linux/leds-ti-lmu-common.h @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// TI LMU Common Core +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ + +#ifndef _TI_LMU_COMMON_H_ +#define _TI_LMU_COMMON_H_ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define LMU_11BIT_LSB_MASK (BIT(0) | BIT(1) | BIT(2)) +#define LMU_11BIT_MSB_SHIFT 3 + +#define MAX_BRIGHTNESS_8BIT 255 +#define MAX_BRIGHTNESS_11BIT 2047 + +struct ti_lmu_bank { + struct regmap *regmap; + + int max_brightness; + + u8 lsb_brightness_reg; + u8 msb_brightness_reg; + + u8 runtime_ramp_reg; + u32 ramp_up_usec; + u32 ramp_down_usec; +}; + +int ti_lmu_common_set_brightness(struct ti_lmu_bank *lmu_bank, int brightness); + +int ti_lmu_common_set_ramp(struct ti_lmu_bank *lmu_bank); + +int ti_lmu_common_get_ramp_params(struct device *dev, + struct fwnode_handle *child, + struct ti_lmu_bank *lmu_data); + +int ti_lmu_common_get_brt_res(struct device *dev, struct fwnode_handle *child, + struct ti_lmu_bank *lmu_data); + +#endif /* _TI_LMU_COMMON_H_ */