Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932925AbaGQMdN (ORCPT ); Thu, 17 Jul 2014 08:33:13 -0400 Received: from mail1.bemta14.messagelabs.com ([193.109.254.116]:19132 "EHLO mail1.bemta14.messagelabs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932833AbaGQMdJ (ORCPT ); Thu, 17 Jul 2014 08:33:09 -0400 X-Greylist: delayed 383 seconds by postgrey-1.27 at vger.kernel.org; Thu, 17 Jul 2014 08:33:09 EDT X-Env-Sender: Andreas.Werner@men.de X-Msg-Ref: server-12.tower-194.messagelabs.com!1405600001!24902179!1 X-Originating-IP: [80.255.6.145] X-StarScan-Received: X-StarScan-Version: 6.11.3; banners=-,-,- X-VirusChecked: Checked X-PGP-Universal: processed; by keys.men.de on Thu, 17 Jul 2014 14:26:41 +0200 Date: Thu, 17 Jul 2014 15:18:51 +0200 From: Andreas Werner To: CC: , , , , , , Subject: [PATCH v3 3/3] drivers/leds/leds-menf21bmc: introduce MEN 14F021P00 BMC LED driver Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) X-Originating-IP: [192.1.1.171] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Added driver to support the 14F021P00 BMC LEDs. The BMC is a Board Management Controll include four LEDs which can be switched on and off. This driver use the I2C interface to the BMC using the menf21bmc MFD Core driver. Signed-off-by: Andreas Werner --- drivers/leds/Kconfig | 6 ++ drivers/leds/Makefile | 1 + drivers/leds/leds-menf21bmc.c | 134 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 141 insertions(+) create mode 100644 drivers/leds/leds-menf21bmc.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 27cf0cd..d38ff3f 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -458,6 +458,12 @@ config LEDS_OT200 This option enables support for the LEDs on the Bachmann OT200. Say Y to enable LEDs on the Bachmann OT200. +config LEDS_MENF21BMC + tristate "LED support for the MEN 14F021P00 BMC" + depends on LEDS_CLASS && MFD_MENF21BMC + help + Say Y here to include support for the MEN 14F021P00 BMC LEDs. + comment "LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)" config LEDS_BLINKM diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 3c03666..cadc433 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -53,6 +53,7 @@ obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o obj-$(CONFIG_LEDS_LM355x) += leds-lm355x.o obj-$(CONFIG_LEDS_BLINKM) += leds-blinkm.o obj-$(CONFIG_LEDS_VERSATILE) += leds-versatile.o +obj-$(CONFIG_LEDS_MENF21BMC) += leds-menf21bmc.o # LED SPI Drivers obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o diff --git a/drivers/leds/leds-menf21bmc.c b/drivers/leds/leds-menf21bmc.c new file mode 100644 index 0000000..5eaa119 --- /dev/null +++ b/drivers/leds/leds-menf21bmc.c @@ -0,0 +1,134 @@ +/* + * MEN 14F021P00 Board Management Controller (BMC) LEDs Driver. + * + * This is the core LED driver of the MEN 14F021P00 BMC. + * There are four LEDs available which can be switched on and off. + * STATUS LED, HOT SWAP LED, USER LED 1, USER LED 2 + * + * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH + * Author: Andreas Werner + * All rights reserved. + * + * 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; either version 2 of the License, or (at your + * option) any later version. + * + */ + +#include +#include +#include +#include +#include + +#define BMC_CMD_LED_GET_SET 0xA0 +#define BMC_BIT_LED_STATUS BIT(0) +#define BMC_BIT_LED_HOTSWAP BIT(1) +#define BMC_BIT_LED_USER1 BIT(2) +#define BMC_BIT_LED_USER2 BIT(3) + +struct menf21bmc_led { + struct led_classdev cdev; + u8 led_bit; + const char *name; + struct i2c_client *i2c_client; +}; + +static struct menf21bmc_led leds[] = { + { + .name = "menf21bmc:led_status", + .led_bit = BMC_BIT_LED_STATUS, + }, + { + .name = "menf21bmc:led_hotswap", + .led_bit = BMC_BIT_LED_HOTSWAP, + }, + { + .name = "menf21bmc:led_user1", + .led_bit = BMC_BIT_LED_USER1, + }, + { + .name = "menf21bmc:led_user2", + .led_bit = BMC_BIT_LED_USER2, + } +}; + +static DEFINE_MUTEX(led_lock); + +static void +menf21bmc_led_set(struct led_classdev *led_cdev, enum led_brightness value) +{ + int led_val; + struct menf21bmc_led *led = container_of(led_cdev, + struct menf21bmc_led, cdev); + + mutex_lock(&led_lock); + led_val = i2c_smbus_read_byte_data(led->i2c_client, + BMC_CMD_LED_GET_SET); + if (led_val < 0) + goto err_out; + + if (value == LED_OFF) + led_val &= ~led->led_bit; + else + led_val |= led->led_bit; + + i2c_smbus_write_byte_data(led->i2c_client, + BMC_CMD_LED_GET_SET, led_val); +err_out: + mutex_unlock(&led_lock); +} + +static int menf21bmc_led_probe(struct platform_device *pdev) +{ + int i; + int ret; + struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent); + + for (i = 0; i < ARRAY_SIZE(leds); i++) { + leds[i].cdev.name = leds[i].name; + leds[i].cdev.brightness_set = menf21bmc_led_set; + leds[i].i2c_client = i2c_client; + ret = led_classdev_register(&pdev->dev, &leds[i].cdev); + if (ret < 0) + goto err_free_leds; + } + dev_info(&pdev->dev, "MEN 140F21P00 BMC LED device enabled\n"); + + return 0; + +err_free_leds: + dev_err(&pdev->dev, "failed to register LED device\n"); + + for (i = i - 1; i >= 0; i--) + led_classdev_unregister(&leds[i].cdev); + + return ret; +} + +static int menf21bmc_led_remove(struct platform_device *pdev) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(leds); i++) + led_classdev_unregister(&leds[i].cdev); + + return 0; +} + +static struct platform_driver menf21bmc_led = { + .probe = menf21bmc_led_probe, + .remove = menf21bmc_led_remove, + .driver = { + .name = "menf21bmc_led", + .owner = THIS_MODULE, + }, +}; + +module_platform_driver(menf21bmc_led); + +MODULE_AUTHOR("Andreas Werner "); +MODULE_DESCRIPTION("MEN 14F021P00 BMC led driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:menf21bmc_led"); -- 2.0.1 -- 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/