From patchwork Fri Jan 9 22:45:45 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Lunn X-Patchwork-Id: 5603111 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id A54A7C058D for ; Fri, 9 Jan 2015 23:06:40 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 7E2962062A for ; Fri, 9 Jan 2015 23:06:39 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B44B120634 for ; Fri, 9 Jan 2015 23:06:37 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Y9ibS-0005Qi-6D; Fri, 09 Jan 2015 23:04:26 +0000 Received: from casper.infradead.org ([2001:770:15f::2]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Y9ibG-0005Nm-QI for linux-arm-kernel@bombadil.infradead.org; Fri, 09 Jan 2015 23:04:15 +0000 Received: from vps0.lunn.ch ([178.209.37.122]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Y9iLs-00067P-S9 for linux-arm-kernel@lists.infradead.org; Fri, 09 Jan 2015 22:48:21 +0000 Received: from andrew by vps0.lunn.ch with local (Exim 4.80) (envelope-from ) id 1Y9iJQ-00082t-BA; Fri, 09 Jan 2015 23:45:48 +0100 From: Andrew Lunn To: cooloney@gmail.com, rpurdie@rpsys.net Subject: [PATCHv2 2/2] leds: tlc59116: Driver for the TI 16 Channel i2c LED driver Date: Fri, 9 Jan 2015 23:45:45 +0100 Message-Id: <1420843545-30892-3-git-send-email-andrew@lunn.ch> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1420843545-30892-1-git-send-email-andrew@lunn.ch> References: <1420843545-30892-1-git-send-email-andrew@lunn.ch> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150109_224820_928114_22FA07D3 X-CRM114-Status: GOOD ( 22.74 ) X-Spam-Score: -1.9 (-) Cc: devicetree@vger.kernel.org, Matthew.Fatheree@belkin.com, Andrew Lunn , linux-leds@vger.kernel.org, kaloz@openwrt.org, linux ARM X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The TLC59116 is an I2C bus controlled 16-channel LED driver. Each LED output has its own 8-bit fixed-frequency PWM controller to control the brightness of the LED. This is based on a driver from Belkin, but has been extensively rewritten. Signed-off-by: Andrew Lunn Cc: Matthew.Fatheree@belkin.com --- drivers/leds/Kconfig | 8 ++ drivers/leds/Makefile | 1 + drivers/leds/leds-tlc59116.c | 252 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 261 insertions(+) create mode 100644 drivers/leds/leds-tlc59116.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index a6c3d2f153f3..8fc283c01673 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -457,6 +457,14 @@ config LEDS_TCA6507 LED driver chips accessed via the I2C bus. Driver support brightness control and hardware-assisted blinking. +config LEDS_TLC59116 + tristate "LED driver for TLC59116F controllers" + depends on LEDS_CLASS && I2C + select REGMAP_I2C + help + This option enables support for Texas Instruments TLC59116F + LED controller. + config LEDS_MAX8997 tristate "LED support for MAX8997 PMIC" depends on LEDS_CLASS && MFD_MAX8997 diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 1c65a191d907..8e7d20acfa7b 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -30,6 +30,7 @@ obj-$(CONFIG_LEDS_LP8501) += leds-lp8501.o obj-$(CONFIG_LEDS_LP8788) += leds-lp8788.o obj-$(CONFIG_LEDS_LP8860) += leds-lp8860.o obj-$(CONFIG_LEDS_TCA6507) += leds-tca6507.o +obj-$(CONFIG_LEDS_TLC59116) += leds-tlc59116.o obj-$(CONFIG_LEDS_CLEVO_MAIL) += leds-clevo-mail.o obj-$(CONFIG_LEDS_IPAQ_MICRO) += leds-ipaq-micro.o obj-$(CONFIG_LEDS_HP6XX) += leds-hp6xx.o diff --git a/drivers/leds/leds-tlc59116.c b/drivers/leds/leds-tlc59116.c new file mode 100644 index 000000000000..9ed8175e7992 --- /dev/null +++ b/drivers/leds/leds-tlc59116.c @@ -0,0 +1,252 @@ +/* + * Copyright 2014 Belkin Inc. + * Copyright 2014 Andrew Lunn + * + * 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; version 2 of the License. + */ + +#include +#include +#include +#include +#include +#include +#include + +#define TLC59116_LEDS 16 + +#define TLC59116_REG_MODE1 0x00 /* Mode register 0 */ +#define MODE1_RESPON_ADDR_MASK 0xF0 +#define MODE1_NORMAL_MODE (0 << 4) +#define MODE1_SPEED_MODE (1 << 4) + +#define TLC59116_REG_MODE2 0x01 /* Mode register 1 */ +#define MODE2_DIM (0 << 5) +#define MODE2_BLINK (1 << 5) +#define MODE2_OCH_STOP (0 << 3) +#define MODE2_OCH_ACK (1 << 3) + +#define TLC59116_REG_PWM(x) (0x02 + x) + +#define TLC59116_REG_GRPPWM 0x12 +#define TLC59116_REG_GRPFREQ 0x13 + +/* LED Driver Output State, determine the source that drives LED outputs */ +#define TLC59116_REG_LEDOUT(x) (0x14 + (x >> 2)) +#define TLC59116_LED_OFF 0x0 /* Output LOW */ +#define TLC59116_LED_ON 0x1 /* Output HI-Z */ +#define TLC59116_DIM 0x2 /* Dimming */ +#define TLC59116_BLINK 0x3 /* Blinking */ +#define LED_MASK 0x3 + +#define ldev_to_led(c) container_of(c, struct tlc59116_led, ldev) +#define work_to_led(work) container_of(work, struct tlc59116_led, work) + +struct tlc59116_led { + bool active; + struct regmap *regmap; + int led_no; + struct led_classdev ldev; + struct work_struct work; +}; + +struct tlc59116_priv { + struct tlc59116_led leds[TLC59116_LEDS]; +}; + +static int +tlc59116_set_mode(struct regmap *regmap, u8 mode) +{ + u8 val = 0; + int err; + + if ((mode != MODE2_DIM) && (mode != MODE2_BLINK)) + mode = MODE2_DIM; + + /* Configure MODE1 register */ + err = regmap_write(regmap, TLC59116_REG_MODE1, MODE1_NORMAL_MODE); + if (err) + return err; + + /* Configure MODE2 Reg */ + val |= MODE2_OCH_STOP; + val |= mode; + + return regmap_write(regmap, TLC59116_REG_MODE2, val); +} + +static int +tlc59116_set_led(struct tlc59116_led *led, u8 val) +{ + struct regmap *regmap = led->regmap; + int i = (led->led_no % 4) * 2; + char addr = TLC59116_REG_LEDOUT(led->led_no); + unsigned int mask = LED_MASK << i; + + val = val << i; + + return regmap_update_bits(regmap, addr, mask, val); +} + +static void +tlc59116_led_work(struct work_struct *work) +{ + struct tlc59116_led *led = work_to_led(work); + struct regmap *regmap = led->regmap; + int err; + u8 pwm; + + pwm = TLC59116_REG_PWM(led->led_no); + err = regmap_write(regmap, pwm, led->ldev.brightness); + if (err) + dev_err(led->ldev.dev, "Failed setting brightness\n"); +} + +static void +tlc59116_led_set(struct led_classdev *led_cdev, enum led_brightness value) +{ + struct tlc59116_led *led = ldev_to_led(led_cdev); + + led->ldev.brightness = value; + schedule_work(&led->work); +} + +static void +tlc59116_destroy_devices(struct tlc59116_priv *priv, int i) +{ + while (--i >= 0) { + if (priv->leds[i].active) { + led_classdev_unregister(&priv->leds[i].ldev); + cancel_work_sync(&priv->leds[i].work); + } + } +} + +static int +tlc59116_configure(struct device *dev, + struct tlc59116_priv *priv, + struct regmap *regmap) +{ + int i, err = 0; + + tlc59116_set_mode(regmap, MODE2_DIM); + for (i = 0; i < TLC59116_LEDS; i++) { + struct tlc59116_led *led = &priv->leds[i]; + + if (!led->active) + continue; + + led->regmap = regmap; + led->led_no = i; + led->ldev.brightness_set = tlc59116_led_set; + led->ldev.max_brightness = LED_FULL; + INIT_WORK(&led->work, tlc59116_led_work); + err = led_classdev_register(dev, &led->ldev); + if (err < 0) { + dev_err(dev, "couldn't register LED %s\n", + led->ldev.name); + goto exit; + } + tlc59116_set_led(led, TLC59116_DIM); + } + + return 0; + +exit: + tlc59116_destroy_devices(priv, i); + return err; +} + +static const struct regmap_config tlc59116_regmap = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0x1e, +}; + +static int +tlc59116_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct tlc59116_priv *priv = i2c_get_clientdata(client); + struct device *dev = &client->dev; + struct device_node *np = client->dev.of_node, *child; + struct regmap *regmap; + int err, count, reg; + + count = of_get_child_count(np); + if (!count || count > TLC59116_LEDS) + return -EINVAL; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA)) + return -EIO; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + regmap = devm_regmap_init_i2c(client, &tlc59116_regmap); + if (IS_ERR(regmap)) { + err = PTR_ERR(regmap); + dev_err(dev, "Failed to allocate register map: %d\n", err); + return err; + } + + i2c_set_clientdata(client, priv); + + for_each_child_of_node(np, child) { + err = of_property_read_u32(child, "reg", ®); + if (err) + return err; + if (reg < 0 || reg >= TLC59116_LEDS) + return -EINVAL; + if (priv->leds[reg].active) + return -EINVAL; + priv->leds[reg].active = true; + priv->leds[reg].ldev.name = + of_get_property(child, "label", NULL) ? : child->name; + priv->leds[reg].ldev.default_trigger = + of_get_property(child, "linux,default-trigger", NULL); + } + return tlc59116_configure(dev, priv, regmap); +} + +static int +tlc59116_remove(struct i2c_client *client) +{ + struct tlc59116_priv *priv = i2c_get_clientdata(client); + + tlc59116_destroy_devices(priv, TLC59116_LEDS); + + return 0; +} + +static const struct of_device_id of_tlc59116_leds_match[] = { + { .compatible = "ti,tlc59116", }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_tlc59116_leds_match); + +static const struct i2c_device_id tlc59116_id[] = { + { "tlc59116" }, + {}, +}; +MODULE_DEVICE_TABLE(i2c, tlc59116_id); + +static struct i2c_driver tlc59116_driver = { + .driver = { + .name = "tlc59116", + .of_match_table = of_match_ptr(of_tlc59116_leds_match), + }, + .probe = tlc59116_probe, + .remove = tlc59116_remove, + .id_table = tlc59116_id, +}; + +module_i2c_driver(tlc59116_driver); + +MODULE_AUTHOR("Andrew Lunn "); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("TLC59116 LED driver");