From patchwork Fri Sep 28 18:29:46 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Murphy X-Patchwork-Id: 10620275 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 228DD15A7 for ; Fri, 28 Sep 2018 18:30:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1218D2C09A for ; Fri, 28 Sep 2018 18:30:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 04FEB2C0B1; Fri, 28 Sep 2018 18:30:56 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 541572C09A for ; Fri, 28 Sep 2018 18:30:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726907AbeI2AzH (ORCPT ); Fri, 28 Sep 2018 20:55:07 -0400 Received: from fllv0015.ext.ti.com ([198.47.19.141]:43118 "EHLO fllv0015.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726118AbeI2AzH (ORCPT ); Fri, 28 Sep 2018 20:55:07 -0400 Received: from dflxv15.itg.ti.com ([128.247.5.124]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id w8SITxdr085394; Fri, 28 Sep 2018 13:29:59 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1538159399; bh=3GAuzUXbOd8jWOv+t3OUo6wLb5KapUn+jO53TkxpDGM=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=rsVcXnnq+A0KKb1qwg0PbLffQO3/wgUY/1pMEGCPORUyDK+/IRWjNyCWIjQl4IZuH UpaKBY0EBxkxgn9eF76Jam22Sp/hCLfwqgIq1T89fqzryxOwZW0RJsOE+Fn+O8hksr jWszUVsJUz3Sj1pqy9g6BA+Ky4viGxOuIPr9s74k= Received: from DFLE100.ent.ti.com (dfle100.ent.ti.com [10.64.6.21]) by dflxv15.itg.ti.com (8.14.3/8.13.8) with ESMTP id w8SITxJT017013; Fri, 28 Sep 2018 13:29:59 -0500 Received: from DFLE102.ent.ti.com (10.64.6.23) by DFLE100.ent.ti.com (10.64.6.21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1466.3; Fri, 28 Sep 2018 13:29:58 -0500 Received: from dflp33.itg.ti.com (10.64.6.16) by DFLE102.ent.ti.com (10.64.6.23) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.1466.3 via Frontend Transport; Fri, 28 Sep 2018 13:29:58 -0500 Received: from legion.dal.design.ti.com (legion.dal.design.ti.com [128.247.22.53]) by dflp33.itg.ti.com (8.14.3/8.13.8) with ESMTP id w8SITwi9014925; Fri, 28 Sep 2018 13:29:58 -0500 Received: from localhost (a0272616local-lt.dhcp.ti.com [172.22.149.181]) by legion.dal.design.ti.com (8.11.7p1+Sun/8.11.7) with ESMTP id w8SITwx27698; Fri, 28 Sep 2018 13:29:58 -0500 (CDT) From: Dan Murphy To: , , CC: , , , , , Milo Kim , Sebastian Reichel Subject: [RFC PATCH v2 1/9] leds: add TI LMU backlight driver Date: Fri, 28 Sep 2018 13:29:46 -0500 Message-ID: <20180928182954.25446-2-dmurphy@ti.com> X-Mailer: git-send-email 2.12.2 In-Reply-To: <20180928182954.25446-1-dmurphy@ti.com> References: <20180928182954.25446-1-dmurphy@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Pavel Machek This adds backlight support for the following TI LMU chips: LM3532, LM3631, LM3632, LM3633, LM3695 and LM3697. It controls LEDs on Droid 4 smartphone, including keyboard and screen backlights. Signed-off-by: Milo Kim [add LED subsystem support for keyboard backlight and rework DT binding according to Rob Herrings feedback] Signed-off-by: Sebastian Reichel [remove backlight subsystem support for now] Signed-off-by: Pavel Machek --- drivers/leds/Kconfig | 8 ++ drivers/leds/Makefile | 1 + drivers/leds/ti-lmu-led-common.c | 138 +++++++++++++++++++++++++++++++ drivers/leds/ti-lmu-led-common.h | 54 ++++++++++++ 4 files changed, 201 insertions(+) create mode 100644 drivers/leds/ti-lmu-led-common.c create mode 100644 drivers/leds/ti-lmu-led-common.h diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 44097a3e0fcc..dc717b30d9d3 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -756,6 +756,14 @@ 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 420b5d2cfa62..e09bb27bc7ea 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -78,6 +78,7 @@ 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-$(CONFIG_LEDS_TI_LMU_COMMON) += ti-lmu-led-common.o # LED SPI Drivers obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o diff --git a/drivers/leds/ti-lmu-led-common.c b/drivers/leds/ti-lmu-led-common.c new file mode 100644 index 000000000000..2d4f22f480d1 --- /dev/null +++ b/drivers/leds/ti-lmu-led-common.c @@ -0,0 +1,138 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2015 Texas Instruments + * Copyright 2018 Sebastian Reichel + * Copyright 2018 Pavel Machek + * + * TI LMU Led driver, based on previous work from + * Milo Kim + */ + +#include +#include +#include +#include +#include + +#include "ti-lmu-led-common.h" + +const static int ramp_table[16] = { 2, 262, 524, 1049, 2090, 4194, 8389, + 16780, 33550, 41940, 50330, 58720, + 67110, 83880, 100660, 117440}; + +static int ti_lmu_common_update_brightness_register(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) +{ + lmu_bank->current_brightness = brightness; + + return ti_lmu_common_update_brightness_register(lmu_bank, brightness); +} +EXPORT_SYMBOL(ti_lmu_common_set_brightness); + +static int ti_lmu_common_convert_ramp_to_index(unsigned int msec) +{ + int size = ARRAY_SIZE(ramp_table); + int i; + + if (msec <= ramp_table[0]) + return 0; + + if (msec > ramp_table[size - 1]) + return size - 1; + + for (i = 1; i < size; i++) { + if (msec == ramp_table[i]) + return i; + + /* Find an approximate index by looking up the table */ + if (msec > ramp_table[i - 1] && msec < ramp_table[i]) { + if (msec - ramp_table[i - 1] < ramp_table[i] - msec) + 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_msec == 0 && lmu_bank->ramp_down_msec == 0) { + ramp_up = 0; + ramp_down = 0; + } else { + ramp_up = ti_lmu_common_convert_ramp_to_index(lmu_bank->ramp_up_msec); + ramp_down = ti_lmu_common_convert_ramp_to_index(lmu_bank->ramp_down_msec); + } + + 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-ms", + &lmu_data->ramp_up_msec); + if (ret) + dev_warn(dev, "ramp-up-ms property missing\n"); + + + ret = fwnode_property_read_u32(child, "ramp-down-ms", + &lmu_data->ramp_down_msec); + if (ret) + dev_warn(dev, "ramp-down-ms property missing\n"); + + return 0; +} +EXPORT_SYMBOL(ti_lmu_common_get_ramp_params); + +MODULE_DESCRIPTION("TI LMU LED Driver"); +MODULE_AUTHOR("Sebastian Reichel"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:ti-lmu-led"); diff --git a/drivers/leds/ti-lmu-led-common.h b/drivers/leds/ti-lmu-led-common.h new file mode 100644 index 000000000000..511768dd54b6 --- /dev/null +++ b/drivers/leds/ti-lmu-led-common.h @@ -0,0 +1,54 @@ +// SPDX-License-Identifier: GPL-2.0 +// TI LMU Common Core +// Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define LMU_DUAL_CHANNEL_USED (BIT(0) | BIT(1)) +#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 + +#define NUM_DUAL_CHANNEL 2 + +struct ti_lmu_bank { + struct regmap *regmap; + + int bank_id; + int fault_monitor_used; + + u8 enable_reg; + unsigned long enable_usec; + + int current_brightness; + u32 default_brightness; + int max_brightness; + + u8 lsb_brightness_reg; + u8 msb_brightness_reg; + + u8 runtime_ramp_reg; + u32 ramp_up_msec; + u32 ramp_down_msec; +}; + + +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);