From patchwork Fri Mar 8 20:09:12 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Murphy X-Patchwork-Id: 159998 Delivered-To: patch@linaro.org Received: by 2002:a02:5cc1:0:0:0:0:0 with SMTP id w62csp9138527jad; Fri, 8 Mar 2019 12:09:41 -0800 (PST) X-Google-Smtp-Source: APXvYqw8+V1FsFzR2c+5l0hgFkaF7xW8BWywUmd34qwuTwQI5+ttpVHxsrX4o9VqUz6+ficgG34g X-Received: by 2002:a17:902:9306:: with SMTP id bc6mr20273528plb.59.1552075781204; Fri, 08 Mar 2019 12:09:41 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1552075781; cv=none; d=google.com; s=arc-20160816; b=bnxgxILJR26Nw9gN3NoF3DSBzClSZPmBMXK5wwn8znNmeVsSrFAgiOJ+78aOext1iN v/6NZjUUU4EvsxLZaKNrE2/mX3pH8mibzjIeJlTC58toX7QgaeJnhm8UelR1myKol8N0 u7rU1VY5QKuC0Id5WYuI37JlJZL0kTBPmQIhc31se3Q4gPZMxtVZfAzMK3YDz3M7lURJ QEu/FcG3bZRcQUYA1pYn4gEHYbsG6PcT0H9R4mFdLAvpvdJLTJcljxkAO4OUfOXLDBYf HCIx2C4CcYhZ8cGul82WauD5iQJ1X1qm3Uumizcbr15F8lhoci/irKn4cGcp0nlW1tvb q8FA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:dkim-signature; bh=Yz15SrG6WifO7b/6u+PIdB3arnfMXOQgK7WKi2rxeOk=; b=L1/Muig2mpbQiJCavD/eyO4AJu6k+eyRcou+lk5liSrUIcYwhbzx7KhVhU1qjCu8Ma PchW+U2PEw18piBsx+yIjf+IpgaiL4fZNH39WQCZ5t76KxnCAHJ2L/ssLHc3gxlSU0ot JxfFX5SetT4k+xnALll7OPKO+Cui4aHRYzk/aGjTDAMOt1wRMDBZCQZI+2WEcpVE0B4g bkq9xcILtNRrd6m7JWbfSZsvjfPy6lAdkXn+PzqCnTYUZTKZ0pNmPpmDhD3Lby2Akra2 3Ax838+0cVe3YX9jg4tHiOF2WnQKS90RW7pbGUiq5rPeRzy1wPwqnI+KoxzLy9KZlTpL fgAg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@ti.com header.s=ti-com-17Q1 header.b=XzP6kTjg; spf=pass (google.com: best guess record for domain of devicetree-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=devicetree-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=NONE dis=NONE) header.from=ti.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id l16si5111249pgg.459.2019.03.08.12.09.40; Fri, 08 Mar 2019 12:09:41 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of devicetree-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=XzP6kTjg; spf=pass (google.com: best guess record for domain of devicetree-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=devicetree-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 S1726348AbfCHUJi (ORCPT + 7 others); Fri, 8 Mar 2019 15:09:38 -0500 Received: from fllv0016.ext.ti.com ([198.47.19.142]:49248 "EHLO fllv0016.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726776AbfCHUJi (ORCPT ); Fri, 8 Mar 2019 15:09:38 -0500 Received: from fllv0034.itg.ti.com ([10.64.40.246]) by fllv0016.ext.ti.com (8.15.2/8.15.2) with ESMTP id x28K9UVF109550; Fri, 8 Mar 2019 14:09:30 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1552075770; bh=Yz15SrG6WifO7b/6u+PIdB3arnfMXOQgK7WKi2rxeOk=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=XzP6kTjgZ1+cwekdhL7Cl9PJ2F4+H5Sf9SunjaPbiNe9xyeVaH5Ln9nAQVHmcPOIZ I5RthMka548+JvtKDAONKzRhR02ZRL0xbywq/xoOAWnpleirtllaqM3QCxYz1BS4PV b313WbANOU21yLKQeRzvjwecJLHYHG4oczCPEG68= Received: from DFLE115.ent.ti.com (dfle115.ent.ti.com [10.64.6.36]) by fllv0034.itg.ti.com (8.15.2/8.15.2) with ESMTPS id x28K9U5T118846 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 8 Mar 2019 14:09:30 -0600 Received: from DFLE110.ent.ti.com (10.64.6.31) by DFLE115.ent.ti.com (10.64.6.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1591.10; Fri, 8 Mar 2019 14:09:29 -0600 Received: from dflp32.itg.ti.com (10.64.6.15) by DFLE110.ent.ti.com (10.64.6.31) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.1591.10 via Frontend Transport; Fri, 8 Mar 2019 14:09:29 -0600 Received: from legion.dal.desgin.ti.com (legion.dal.design.ti.com [128.247.22.53]) by dflp32.itg.ti.com (8.14.3/8.13.8) with ESMTP id x28K9TTa018385; Fri, 8 Mar 2019 14:09:29 -0600 Received: from localhost (a0272616local-lt.dhcp.ti.com [172.22.114.154]) by legion.dal.desgin.ti.com (8.11.7p1+Sun/8.11.7) with ESMTP id x28K9TU27905; Fri, 8 Mar 2019 14:09:29 -0600 (CST) From: Dan Murphy To: , , , , CC: , , , Dan Murphy Subject: [PATCH v2 4/4] leds: lm3532: Introduce the lm3532 LED driver Date: Fri, 8 Mar 2019 14:09:12 -0600 Message-ID: <20190308200912.28163-4-dmurphy@ti.com> X-Mailer: git-send-email 2.12.2 In-Reply-To: <20190308200912.28163-1-dmurphy@ti.com> References: <20190308200912.28163-1-dmurphy@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Introduce the Texas Instruments LM3532 White LED driver. The driver supports ALS configurability or manual brightness control. The driver also supports associating LED strings with specific control banks in a group or as individually controlled strings. Signed-off-by: Dan Murphy --- v2 - Added look up tables for als_avg, als_imp and ramp times, fixed brightness control when ALS is in control, added property value checks to ensure the values are not out of bounds - https://lore.kernel.org/patchwork/patch/1048807/ drivers/leds/Kconfig | 10 + drivers/leds/Makefile | 1 + drivers/leds/leds-lm3532.c | 734 +++++++++++++++++++++++++++++++++++++ 3 files changed, 745 insertions(+) create mode 100644 drivers/leds/leds-lm3532.c -- 2.20.1.390.gb5101f9297 diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index a72f97fca57b..da00b9ed5a5c 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -138,6 +138,16 @@ config LEDS_LM3530 controlled manually or using PWM input or using ambient light automatically. +config LEDS_LM3532 + tristate "LCD Backlight driver for LM3532" + depends on LEDS_CLASS + depends on I2C + help + This option enables support for the LCD backlight using + LM3532 ambient light sensor chip. This ALS chip can be + controlled manually or using PWM input or using ambient + light automatically. + config LEDS_LM3533 tristate "LED support for LM3533" depends on LEDS_CLASS diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 4c1b0054f379..7a8b1f55d459 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -18,6 +18,7 @@ obj-$(CONFIG_LEDS_BD2802) += leds-bd2802.o obj-$(CONFIG_LEDS_CPCAP) += leds-cpcap.o obj-$(CONFIG_LEDS_LOCOMO) += leds-locomo.o obj-$(CONFIG_LEDS_LM3530) += leds-lm3530.o +obj-$(CONFIG_LEDS_LM3532) += leds-lm3532.o obj-$(CONFIG_LEDS_LM3533) += leds-lm3533.o obj-$(CONFIG_LEDS_LM3642) += leds-lm3642.o obj-$(CONFIG_LEDS_MIKROTIK_RB532) += leds-rb532.o diff --git a/drivers/leds/leds-lm3532.c b/drivers/leds/leds-lm3532.c new file mode 100644 index 000000000000..e3ddfab2faf3 --- /dev/null +++ b/drivers/leds/leds-lm3532.c @@ -0,0 +1,734 @@ +// SPDX-License-Identifier: GPL-2.0 +// TI LM3532 LED driver +// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define LM3532_NAME "lm3532-led" +#define LM3532_BL_MODE_MANUAL 0x00 +#define LM3532_BL_MODE_ALS 0x01 + +#define LM3532_REG_OUTPUT_CFG 0x10 +#define LM3532_REG_STARTSHUT_RAMP 0x11 +#define LM3532_REG_RT_RAMP 0x12 +#define LM3532_REG_PWM_A_CFG 0x13 +#define LM3532_REG_PWM_B_CFG 0x14 +#define LM3532_REG_PWM_C_CFG 0x15 +#define LM3532_REG_ZONE_CFG_A 0x16 +#define LM3532_REG_CTRL_A_BRT 0x17 +#define LM3532_REG_ZONE_CFG_B 0x18 +#define LM3532_REG_CTRL_B_BRT 0x19 +#define LM3532_REG_ZONE_CFG_C 0x1a +#define LM3532_REG_CTRL_C_BRT 0x1b +#define LM3532_REG_ENABLE 0x1d +#define LM3532_ALS_CONFIG 0x23 +#define LM3532_REG_ZN_0_HI 0x60 +#define LM3532_REG_ZN_0_LO 0x61 +#define LM3532_REG_ZN_1_HI 0x62 +#define LM3532_REG_ZN_1_LO 0x63 +#define LM3532_REG_ZN_2_HI 0x64 +#define LM3532_REG_ZN_2_LO 0x65 +#define LM3532_REG_ZN_3_HI 0x66 +#define LM3532_REG_ZN_3_LO 0x67 +#define LM3532_REG_MAX 0x7e + +/* Contorl Enable */ +#define LM3532_CTRL_A_ENABLE BIT(0) +#define LM3532_CTRL_B_ENABLE BIT(1) +#define LM3532_CTRL_C_ENABLE BIT(2) + +/* PWM Zone Control */ +#define LM3532_PWM_ZONE_MASK 0x7c +#define LM3532_PWM_ZONE_0_EN BIT(2) +#define LM3532_PWM_ZONE_1_EN BIT(3) +#define LM3532_PWM_ZONE_2_EN BIT(4) +#define LM3532_PWM_ZONE_3_EN BIT(5) +#define LM3532_PWM_ZONE_4_EN BIT(6) + +/* Brightness Configuration */ +#define LM3532_I2C_CTRL BIT(0) +#define LM3532_ALS_CTRL 0 +#define LM3532_LINEAR_MAP BIT(1) +#define LM3532_ZONE_MASK (BIT(2) | BIT(3) | BIT(4)) +#define LM3532_ZONE_0 0 +#define LM3532_ZONE_1 BIT(2) +#define LM3532_ZONE_2 BIT(3) +#define LM3532_ZONE_3 (BIT(2) | BIT(3)) +#define LM3532_ZONE_4 BIT(4) + +#define LM3532_ENABLE_ALS BIT(3) +#define LM3532_ALS_SEL_SHIFT 6 + +/* Zone Boundary Register */ +#define LM3532_ALS_WINDOW_mV 2000 +#define LM3532_ALS_ZB_MAX 4 +#define LM3532_ALS_OFFSET_mV 2 + +#define LM3532_CONTROL_A 0 +#define LM3532_CONTROL_B 1 +#define LM3532_CONTROL_C 2 +#define LM3532_MAX_CONTROL_BANKS 3 +#define LM3532_MAX_LED_STRINGS 3 + +#define LM3532_OUTPUT_CFG_MASK 0x3 +#define LM3532_BRT_VAL_ADJUST 8 +#define LM3532_RAMP_DOWN_SHIFT 3 + +#define LM3532_NUM_RAMP_VALS 8 +#define LM3532_NUM_AVG_VALS 8 +#define LM3532_NUM_IMP_VALS 32 + +/* + * struct lm3532_als_data + * @config - value of ALS configuration register + * @als1_imp_sel - value of ALS1 resistor select register + * @als2_imp_sel - value of ALS2 resistor select register + * @als_avrg_time - ALS averaging time + * @als_input_mode - ALS input mode for brightness control + * @als_vmin - Minimum ALS voltage + * @als_vmax - Maximum ALS voltage + * @zone_lo - values of ALS lo ZB(Zone Boundary) registers + * @zone_hi - values of ALS hi ZB(Zone Boundary) registers + */ +struct lm3532_als_data { + u8 config; + u8 als1_imp_sel; + u8 als2_imp_sel; + u8 als_avrg_time; + u8 als_input_mode; + u32 als_vmin; + u32 als_vmax; + u8 zones_lo[LM3532_ALS_ZB_MAX]; + u8 zones_hi[LM3532_ALS_ZB_MAX]; +}; + +/** + * struct lm3532_led + * @led_dev: led class device + * @priv - Pointer the device data structure + * @control_bank - Control bank the LED is associated to + * @mode - Mode of the LED string + * @num_leds - Number of LED strings are supported in this array + * @led_strings - The LED strings supported in this array + * @label - LED label + */ +struct lm3532_led { + struct led_classdev led_dev; + struct lm3532_data *priv; + + int control_bank; + int mode; + int num_leds; + u32 led_strings[LM3532_MAX_CONTROL_BANKS]; + char label[LED_MAX_NAME_SIZE]; +}; + +/** + * struct lm3532_data + * @enable_gpio - Hardware enable gpio + * @regulator: regulator + * @client: i2c client + * @regmap - Devices register map + * @dev - Pointer to the devices device struct + * @lock - Lock for reading/writing the device + * @als_data - Pointer to the als data struct + * @runtime_ramp_up - Runtime ramp up setting + * @runtime_ramp_down - Runtime ramp down setting + * @leds - Array of LED strings + */ +struct lm3532_data { + struct gpio_desc *enable_gpio; + struct regulator *regulator; + struct i2c_client *client; + struct regmap *regmap; + struct device *dev; + struct mutex lock; + + struct lm3532_als_data *als_data; + + u32 runtime_ramp_up; + u32 runtime_ramp_down; + + struct lm3532_led leds[]; +}; + +static const struct reg_default lm3532_reg_defs[] = { + {LM3532_REG_OUTPUT_CFG, 0xe4}, + {LM3532_REG_STARTSHUT_RAMP, 0xc0}, + {LM3532_REG_RT_RAMP, 0xc0}, + {LM3532_REG_PWM_A_CFG, 0x82}, + {LM3532_REG_PWM_B_CFG, 0x82}, + {LM3532_REG_PWM_C_CFG, 0x82}, + {LM3532_REG_ZONE_CFG_A, 0xf1}, + {LM3532_REG_CTRL_A_BRT, 0xf3}, + {LM3532_REG_ZONE_CFG_B, 0xf1}, + {LM3532_REG_CTRL_B_BRT, 0xf3}, + {LM3532_REG_ZONE_CFG_C, 0xf1}, + {LM3532_REG_CTRL_C_BRT, 0xf3}, + {LM3532_REG_ENABLE, 0xf8}, + {LM3532_ALS_CONFIG, 0x44}, + {LM3532_REG_ZN_0_HI, 0x35}, + {LM3532_REG_ZN_0_LO, 0x33}, + {LM3532_REG_ZN_1_HI, 0x6a}, + {LM3532_REG_ZN_1_LO, 0x66}, + {LM3532_REG_ZN_2_HI, 0xa1}, + {LM3532_REG_ZN_2_LO, 0x99}, + {LM3532_REG_ZN_3_HI, 0xdc}, + {LM3532_REG_ZN_3_LO, 0xcc}, +}; + +static const struct regmap_config lm3532_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + + .max_register = LM3532_REG_MAX, + .reg_defaults = lm3532_reg_defs, + .num_reg_defaults = ARRAY_SIZE(lm3532_reg_defs), + .cache_type = REGCACHE_FLAT, +}; + +const static int als_imp_table[LM3532_NUM_IMP_VALS] = {37000, 18500, 12330, + 92500, 7400, 6170, 5290, + 4630, 4110, 3700, 3360, + 3080, 2850, 2640, 2440, + 2310, 2180, 2060, 1950, + 1850, 1760, 1680, 1610, + 1540, 1480, 1420, 1370, + 1320, 1280, 1230, 1190}; +static int lm3532_get_als_imp_index(int als_imped) +{ + int i; + + if (als_imped > als_imp_table[1]) + return 0; + + if (als_imped < als_imp_table[LM3532_NUM_IMP_VALS - 1]) + return LM3532_NUM_IMP_VALS - 1; + + for (i = 1; i < LM3532_NUM_IMP_VALS; i++) { + if (als_imped == als_imp_table[i]) + return i; + + /* Find an approximate index by looking up the table */ + if (als_imped < als_imp_table[i - 1] && + als_imped > als_imp_table[i]) { + if (als_imped - als_imp_table[i - 1] < + als_imp_table[i] - als_imped) + return i + 1; + else + return i; + } + } + + return -EINVAL; +} + +static int lm3532_get_index(const int table[], int size, int value) +{ + int i; + + for (i = 1; i < size; i++) { + if (value == table[i]) + return i; + + /* Find an approximate index by looking up the table */ + if (value > table[i - 1] && + value < table[i]) { + if (value - table[i - 1] < table[i] - value) + return i - 1; + else + return i; + } + } + + return -EINVAL; +} + +const static int als_avrg_table[LM3532_NUM_AVG_VALS] = {17920, 35840, 71680, + 1433360, 286720, 573440, + 1146880, 2293760}; +static int lm3532_get_als_avg_index(int avg_time) +{ + if (avg_time <= als_avrg_table[0]) + return 0; + + if (avg_time > als_avrg_table[LM3532_NUM_AVG_VALS - 1]) + return LM3532_NUM_AVG_VALS - 1; + + return lm3532_get_index(&als_avrg_table[0], LM3532_NUM_AVG_VALS, + avg_time); +} + +const static int ramp_table[LM3532_NUM_RAMP_VALS] = { 8, 1024, 2048, 4096, 8192, + 16384, 32768, 65536}; +static int lm3532_get_ramp_index(int ramp_time) +{ + if (ramp_time <= ramp_table[0]) + return 0; + + if (ramp_time > ramp_table[LM3532_NUM_RAMP_VALS - 1]) + return LM3532_NUM_RAMP_VALS - 1; + + return lm3532_get_index(&ramp_table[0], LM3532_NUM_RAMP_VALS, + ramp_time); +} + +static int lm3532_led_enable(struct lm3532_led *led_data) +{ + int ctrl_en_val; + int ret; + + switch (led_data->control_bank) { + case LM3532_CONTROL_A: + ctrl_en_val = LM3532_CTRL_A_ENABLE; + break; + case LM3532_CONTROL_B: + ctrl_en_val = LM3532_CTRL_B_ENABLE; + break; + case LM3532_CONTROL_C: + ctrl_en_val = LM3532_CTRL_C_ENABLE; + break; + default: + dev_err(led_data->priv->dev, "Invalid control bank\n"); + return -EINVAL; + }; + + ret = regmap_update_bits(led_data->priv->regmap, LM3532_REG_ENABLE, + ctrl_en_val, ctrl_en_val); + if (ret) { + dev_err(led_data->priv->dev, "Failed to set ctrl:%d\n", ret); + return ret; + } + + return regulator_enable(led_data->priv->regulator); +} + +static int lm3532_led_disable(struct lm3532_led *led_data) +{ + int ctrl_en_val; + int ret; + + switch (led_data->control_bank) { + case LM3532_CONTROL_A: + ctrl_en_val = LM3532_CTRL_A_ENABLE; + break; + case LM3532_CONTROL_B: + ctrl_en_val = LM3532_CTRL_B_ENABLE; + break; + case LM3532_CONTROL_C: + ctrl_en_val = LM3532_CTRL_C_ENABLE; + break; + default: + dev_err(led_data->priv->dev, "Invalid control bank\n"); + return -EINVAL; + }; + + ret = regmap_update_bits(led_data->priv->regmap, LM3532_REG_ENABLE, + ctrl_en_val, ~ctrl_en_val); + if (ret) { + dev_err(led_data->priv->dev, "Failed to set ctrl:%d\n", ret); + return ret; + } + + return regulator_disable(led_data->priv->regulator); +} + +static int lm3532_brightness_set(struct led_classdev *led_cdev, + enum led_brightness brt_val) +{ + struct lm3532_led *led = + container_of(led_cdev, struct lm3532_led, led_dev); + u8 brightnes_reg; + int ret; + + mutex_lock(&led->priv->lock); + + if (led->mode == LM3532_BL_MODE_ALS) { + if (brt_val > LED_OFF) + ret = lm3532_led_enable(led); + else + ret = lm3532_led_disable(led); + + goto unlock; + } + + switch (led->control_bank) { + case LM3532_CONTROL_A: + brightnes_reg = LM3532_REG_CTRL_A_BRT; + break; + case LM3532_CONTROL_B: + brightnes_reg = LM3532_REG_CTRL_B_BRT; + break; + case LM3532_CONTROL_C: + brightnes_reg = LM3532_REG_CTRL_C_BRT; + break; + default: + dev_err(led->priv->dev, "Invalid control bank\n"); + ret = -EINVAL; + goto unlock; + }; + + if (brt_val == LED_OFF) { + ret = lm3532_led_disable(led); + goto unlock; + } + + lm3532_led_enable(led); + brt_val = brt_val / LM3532_BRT_VAL_ADJUST; + + ret = regmap_write(led->priv->regmap, brightnes_reg, brt_val); + +unlock: + mutex_unlock(&led->priv->lock); + return ret; +} + +static int lm3532_init_registers(struct lm3532_led *led) +{ + struct lm3532_data *drvdata = led->priv; + unsigned int runtime_ramp_val; + unsigned int output_cfg_val = 0; + unsigned int output_cfg_shift = 0; + unsigned int output_cfg_mask = 0; + int ret, i; + + for (i = 0; i < led->num_leds; i++) { + output_cfg_shift = led->led_strings[i] * 2; + output_cfg_val |= (led->control_bank << output_cfg_shift); + output_cfg_mask |= LM3532_OUTPUT_CFG_MASK << output_cfg_shift; + } + + ret = regmap_update_bits(drvdata->regmap, LM3532_REG_OUTPUT_CFG, + output_cfg_mask, output_cfg_val); + + runtime_ramp_val = drvdata->runtime_ramp_up | + (drvdata->runtime_ramp_down << LM3532_RAMP_DOWN_SHIFT); + + return regmap_write(drvdata->regmap, LM3532_REG_RT_RAMP, + runtime_ramp_val); +} + +static int lm3532_als_configure(struct lm3532_data *priv, + struct lm3532_led *led) +{ + struct lm3532_als_data *als = priv->als_data; + u32 als_vmin, als_vmax, als_vstep; + int zone_reg = LM3532_REG_ZN_0_HI; + int brightnes_config_reg; + int ret; + int i; + + als_vmin = als->als_vmin; + als_vmax = als->als_vmax; + + als_vstep = (als_vmax - als_vmin) / ((LM3532_ALS_ZB_MAX + 1) * 2); + + for (i = 0; i < LM3532_ALS_ZB_MAX; i++) { + als->zones_lo[i] = ((als_vmin + als_vstep + (i * als_vstep)) * + LED_FULL) / 1000; + als->zones_hi[i] = ((als_vmin + LM3532_ALS_OFFSET_mV + + als_vstep + (i * als_vstep)) * LED_FULL) / 1000; + + zone_reg = LM3532_REG_ZN_0_HI + i * 2; + ret = regmap_write(priv->regmap, zone_reg, als->zones_lo[i]); + if (ret) + return ret; + + zone_reg += 1; + ret = regmap_write(priv->regmap, zone_reg, als->zones_hi[i]); + if (ret) + return ret; + } + + als->config = (als->als_avrg_time | (LM3532_ENABLE_ALS) | + (als->als_input_mode << LM3532_ALS_SEL_SHIFT)); + + ret = regmap_write(priv->regmap, LM3532_ALS_CONFIG, als->config); + if (ret) + return ret; + + switch (led->control_bank) { + case LM3532_CONTROL_A: + brightnes_config_reg = LM3532_REG_ZONE_CFG_A; + break; + case LM3532_CONTROL_B: + brightnes_config_reg = LM3532_REG_ZONE_CFG_B; + break; + case LM3532_CONTROL_C: + brightnes_config_reg = LM3532_REG_ZONE_CFG_C; + break; + default: + dev_err(led->priv->dev, "Invalid control bank\n"); + return -EINVAL; + }; + + return regmap_update_bits(priv->regmap, brightnes_config_reg, + LM3532_I2C_CTRL, LM3532_ALS_CTRL); +} + +static int lm3532_parse_als(struct lm3532_data *priv) +{ + struct lm3532_als_data *als; + int als_avg_time; + int als_impedance; + int ret; + + als = devm_kzalloc(priv->dev, sizeof(*als), GFP_KERNEL); + if (als == NULL) + return -ENOMEM; + + ret = device_property_read_u32(&priv->client->dev, "als-vmin", + &als->als_vmin); + if (ret) + als->als_vmin = 0; + + ret = device_property_read_u32(&priv->client->dev, "als-vmax", + &als->als_vmax); + if (ret) + als->als_vmax = LM3532_ALS_WINDOW_mV; + + if (als->als_vmax > LM3532_ALS_WINDOW_mV) { + ret = -EINVAL; + return ret; + } + + ret = device_property_read_u32(&priv->client->dev, "als1-imp-sel", + &als_impedance); + if (ret) + als->als1_imp_sel = 0; + else + als->als1_imp_sel = lm3532_get_als_imp_index(als_impedance); + + ret = device_property_read_u32(&priv->client->dev, "als2-imp-sel", + &als_impedance); + if (ret) + als->als2_imp_sel = 0; + else + als->als2_imp_sel = lm3532_get_als_imp_index(als_impedance); + + ret = device_property_read_u32(&priv->client->dev, "als-avrg-time-us", + &als_avg_time); + if (ret) + als->als_avrg_time = 0; + else + als->als_avrg_time = lm3532_get_als_avg_index(als_avg_time); + + ret = device_property_read_u8(&priv->client->dev, "als-input-mode", + &als->als_input_mode); + if (ret) + als->als_input_mode = 0; + + if (als->als_input_mode > LM3532_BL_MODE_ALS) { + ret = -EINVAL; + return ret; + } + + priv->als_data = als; + + return ret; +} + +static int lm3532_parse_node(struct lm3532_data *priv) +{ + struct fwnode_handle *child = NULL; + struct lm3532_led *led; + const char *name; + int control_bank; + u32 ramp_time; + size_t i = 0; + int ret; + + priv->enable_gpio = devm_gpiod_get_optional(&priv->client->dev, + "enable", GPIOD_OUT_LOW); + if (IS_ERR(priv->enable_gpio)) + priv->enable_gpio = NULL; + + priv->regulator = devm_regulator_get(&priv->client->dev, "vin"); + if (IS_ERR(priv->regulator)) + priv->regulator = NULL; + + ret = device_property_read_u32(&priv->client->dev, "ramp-up-us", + &ramp_time); + if (ret) + dev_info(&priv->client->dev, "ramp-up-ms property missing\n"); + else + priv->runtime_ramp_up = lm3532_get_ramp_index(ramp_time); + + ret = device_property_read_u32(&priv->client->dev, "ramp-down-us", + &ramp_time); + if (ret) + dev_info(&priv->client->dev, "ramp-down-ms property missing\n"); + else + priv->runtime_ramp_down = lm3532_get_ramp_index(ramp_time); + + device_for_each_child_node(priv->dev, child) { + led = &priv->leds[i]; + + ret = fwnode_property_read_u32(child, "reg", &control_bank); + if (ret) { + dev_err(&priv->client->dev, "reg property missing\n"); + fwnode_handle_put(child); + goto child_out; + } + + if (control_bank > LM3532_CONTROL_C) { + dev_err(&priv->client->dev, "Control bank invalid\n"); + continue; + } + + led->control_bank = control_bank; + + ret = fwnode_property_read_u32(child, "ti,led-mode", + &led->mode); + if (ret) { + dev_err(&priv->client->dev, "ti,led-mode property missing\n"); + fwnode_handle_put(child); + goto child_out; + } + + if (led->mode == LM3532_BL_MODE_ALS) { + ret = lm3532_parse_als(priv); + if (ret) + dev_err(&priv->client->dev, "Failed to parse als\n"); + else + lm3532_als_configure(priv, led); + } + + led->num_leds = fwnode_property_read_u32_array(child, + "led-sources", + NULL, 0); + + if (led->num_leds > LM3532_MAX_LED_STRINGS) { + dev_err(&priv->client->dev, "To many LED string defined\n"); + continue; + } + + ret = fwnode_property_read_u32_array(child, "led-sources", + led->led_strings, + led->num_leds); + if (ret) { + dev_err(&priv->client->dev, "led-sources property missing\n"); + fwnode_handle_put(child); + goto child_out; + } + + fwnode_property_read_string(child, "linux,default-trigger", + &led->led_dev.default_trigger); + + ret = fwnode_property_read_string(child, "label", &name); + if (ret) + snprintf(led->label, sizeof(led->label), + "%s::", priv->client->name); + else + snprintf(led->label, sizeof(led->label), + "%s:%s", priv->client->name, name); + + led->priv = priv; + led->led_dev.name = led->label; + led->led_dev.brightness_set_blocking = lm3532_brightness_set; + + ret = devm_led_classdev_register(priv->dev, &led->led_dev); + if (ret) { + dev_err(&priv->client->dev, "led register err: %d\n", + ret); + fwnode_handle_put(child); + goto child_out; + } + + lm3532_init_registers(led); + + i++; + } + +child_out: + return ret; +} + +static int lm3532_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct lm3532_data *drvdata; + int ret = 0; + int count; + + count = device_get_child_node_count(&client->dev); + if (!count) { + dev_err(&client->dev, "LEDs are not defined in device tree!"); + return -ENODEV; + } + + drvdata = devm_kzalloc(&client->dev, struct_size(drvdata, leds, count), + GFP_KERNEL); + if (drvdata == NULL) + return -ENOMEM; + + drvdata->client = client; + drvdata->dev = &client->dev; + + drvdata->regmap = devm_regmap_init_i2c(client, &lm3532_regmap_config); + if (IS_ERR(drvdata->regmap)) { + ret = PTR_ERR(drvdata->regmap); + dev_err(&client->dev, "Failed to allocate register map: %d\n", + ret); + return ret; + } + + mutex_init(&drvdata->lock); + i2c_set_clientdata(client, drvdata); + + ret = lm3532_parse_node(drvdata); + if (ret) { + dev_err(&client->dev, "Failed to parse node\n"); + return ret; + } + + if (drvdata->enable_gpio) + gpiod_direction_output(drvdata->enable_gpio, 1); + + return ret; +} + +static int lm3532_remove(struct i2c_client *client) +{ + struct lm3532_data *drvdata = i2c_get_clientdata(client); + + if (drvdata->enable_gpio) + gpiod_direction_output(drvdata->enable_gpio, 0); + + return 0; +} + +static const struct of_device_id of_lm3532_leds_match[] = { + { .compatible = "ti,lm3532", }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_lm3532_leds_match); + +static const struct i2c_device_id lm3532_id[] = { + {LM3532_NAME, 0}, + {} +}; +MODULE_DEVICE_TABLE(i2c, lm3532_id); + +static struct i2c_driver lm3532_i2c_driver = { + .probe = lm3532_probe, + .remove = lm3532_remove, + .id_table = lm3532_id, + .driver = { + .name = LM3532_NAME, + .of_match_table = of_lm3532_leds_match, + }, +}; +module_i2c_driver(lm3532_i2c_driver); + +MODULE_DESCRIPTION("Back Light driver for LM3532"); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Dan Murphy ");