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Tue, 31 Oct 2023 01:51:47 +0000 From: "larry.lai" To: lee@kernel.org, andriy.shevchenko@linux.intel.com, linus.walleij@linaro.org, pavel@ucw.cz Cc: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-leds@vger.kernel.org, GaryWang@aaeon.com.tw, musa.lin@yunjingtech.com, jack.chang@yunjingtech.com, noah.hung@yunjingtech.com, "larry.lai" , Gary Wang Subject: [PATCH V7 3/3] leds: Add support for UP board CPLD onboard LEDS Date: Tue, 31 Oct 2023 09:51:19 +0800 Message-Id: <20231031015119.29756-4-larry.lai@yunjingtech.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20231031015119.29756-1-larry.lai@yunjingtech.com> References: <20231031015119.29756-1-larry.lai@yunjingtech.com> X-ClientProxiedBy: TYXPR01CA0060.jpnprd01.prod.outlook.com (2603:1096:403:a::30) To SEYPR06MB6507.apcprd06.prod.outlook.com (2603:1096:101:177::9) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SEYPR06MB6507:EE_|SEZPR06MB6926:EE_ X-MS-Office365-Filtering-Correlation-Id: 28d29f6b-f4dd-42cc-ec5e-08dbd9b3f16e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Mon, 30 Oct 2023 18:52:07 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1781234011620544719 X-GMAIL-MSGID: 1781234011620544719 The UP boards come with a few FPGA-controlled onboard LEDs: * UP Board: yellow, green, red * UP Squared: blue, yellow, green, red This patch depends on patch "mfd: Add support for UP board CPLD/FPGA". Signed-off-by: Gary Wang Signed-off-by: larry.lai --- PATCH V6 --> PATCH V7: cleaned up coding style and addressed review comments. PATCH V4 -> PATCH V6 : There is no change. RFC 2023/04/25 -> PATCH V4 (1) Fixed kernel test robot compiler warning. (2) Remove mistakes with wrong Reviewed-by tags. RFC 2022/11/23 --> RFC 2023/04/25: Refer 2022/12/08 Lee Jones review, cleaned up coding style. PATCH V3 -> RFC 2022/11/23: Update the changes Copyright. PATCH V1 -> V3: There is no change. PATCH --> PATCH V1: Refer 2022/10/03 Andy Shevchenko review, cleaned up coding style. --- drivers/leds/Kconfig | 10 +++ drivers/leds/Makefile | 1 + drivers/leds/leds-upboard.c | 154 ++++++++++++++++++++++++++++++++++++ 3 files changed, 165 insertions(+) create mode 100644 drivers/leds/leds-upboard.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 499d0f215a8b..d9d533cb38ca 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -872,6 +872,16 @@ source "drivers/leds/flash/Kconfig" comment "RGB LED drivers" source "drivers/leds/rgb/Kconfig" +config LEDS_UPBOARD + tristate "LED support for the UP board" + depends on LEDS_CLASS + depends on MFD_INTEL_UPBOARD_FPGA + help + This option enables support for the UP board LEDs. + + To compile this driver as a module, choose M here: the module + will be called leds-upboard. + comment "LED Triggers" source "drivers/leds/trigger/Kconfig" diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 4fd2f92cd198..e72956645646 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -83,6 +83,7 @@ obj-$(CONFIG_LEDS_TI_LMU_COMMON) += leds-ti-lmu-common.o obj-$(CONFIG_LEDS_TLC591XX) += leds-tlc591xx.o obj-$(CONFIG_LEDS_TPS6105X) += leds-tps6105x.o obj-$(CONFIG_LEDS_TURRIS_OMNIA) += leds-turris-omnia.o +obj-$(CONFIG_LEDS_UPBOARD) += leds-upboard.o obj-$(CONFIG_LEDS_WM831X_STATUS) += leds-wm831x-status.o obj-$(CONFIG_LEDS_WM8350) += leds-wm8350.o obj-$(CONFIG_LEDS_WRAP) += leds-wrap.o diff --git a/drivers/leds/leds-upboard.c b/drivers/leds/leds-upboard.c new file mode 100644 index 000000000000..8198f41563ea --- /dev/null +++ b/drivers/leds/leds-upboard.c @@ -0,0 +1,154 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * UP Board CPLD/FPGA based LED driver + * + * Copyright (c) AAEON. All rights reserved. + * + * Author: Gary Wang + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +struct upboard_led { + struct regmap_field *field; + struct led_classdev cdev; + unsigned char bit; +}; + +static enum led_brightness upboard_led_brightness_get(struct led_classdev *cdev) +{ + struct upboard_led *led = container_of(cdev, struct upboard_led, cdev); + int brightness = 0; + + regmap_field_read(led->field, &brightness); + + return brightness; +}; + +static void upboard_led_brightness_set(struct led_classdev *cdev, enum led_brightness brightness) +{ + struct upboard_led *led = container_of(cdev, struct upboard_led, cdev); + + regmap_field_write(led->field, brightness != LED_OFF); +}; + +static struct gpio_led_platform_data upboard_gpio_led_pd; +static const struct mfd_cell upboard_gpio_led_cells[] = { + MFD_CELL_BASIC("leds-gpio", NULL, + &upboard_gpio_led_pd, + sizeof(upboard_gpio_led_pd), 0) +}; + +int upboard_led_gpio_register(struct upboard_fpga *fpga) +{ + struct gpio_led blue_led, yellow_led, green_led, red_led; + struct gpio_desc *desc; + static struct gpio_led leds[4]; + int num_leds = 0; + int ret; + + desc = devm_gpiod_get(fpga->dev, "blue", GPIOD_OUT_LOW); + if (!IS_ERR(desc)) { + blue_led.name = "upboard:blue:"; + blue_led.gpio = desc_to_gpio(desc); + blue_led.default_state = LEDS_GPIO_DEFSTATE_KEEP; + leds[num_leds++] = blue_led; + devm_gpiod_put(fpga->dev, desc); + } + + desc = devm_gpiod_get(fpga->dev, "yellow", GPIOD_OUT_LOW); + if (!IS_ERR(desc)) { + yellow_led.name = "upboard:yellow:"; + yellow_led.gpio = desc_to_gpio(desc); + yellow_led.default_state = LEDS_GPIO_DEFSTATE_KEEP; + leds[num_leds++] = yellow_led; + devm_gpiod_put(fpga->dev, desc); + } + + desc = devm_gpiod_get(fpga->dev, "green", GPIOD_OUT_LOW); + if (!IS_ERR(desc)) { + green_led.name = "upboard:green:"; + green_led.gpio = desc_to_gpio(desc); + green_led.default_state = LEDS_GPIO_DEFSTATE_KEEP; + leds[num_leds++] = green_led; + devm_gpiod_put(fpga->dev, desc); + } + + desc = devm_gpiod_get(fpga->dev, "red", GPIOD_OUT_LOW); + if (!IS_ERR(desc)) { + red_led.name = "upboard:red:"; + red_led.gpio = desc_to_gpio(desc); + red_led.default_state = LEDS_GPIO_DEFSTATE_KEEP; + leds[num_leds++] = red_led; + devm_gpiod_put(fpga->dev, desc); + } + + /* No optional LEDs defined */ + if (num_leds == 0) + return -ENODEV; + + upboard_gpio_led_pd.num_leds = num_leds; + upboard_gpio_led_pd.leds = leds; + + ret = devm_mfd_add_devices(fpga->dev, PLATFORM_DEVID_AUTO, + upboard_gpio_led_cells, + ARRAY_SIZE(upboard_gpio_led_cells), + NULL, 0, NULL); + if (ret) { + dev_err(fpga->dev, "Failed to add GPIO LEDs, %d", ret); + return ret; + } + + return 0; +} + +static int __init upboard_led_probe(struct platform_device *pdev) +{ + struct upboard_fpga * const cpld = dev_get_drvdata(pdev->dev.parent); + struct reg_field fldconf = { + .reg = UPFPGA_REG_FUNC_EN0, + }; + struct upboard_led_data * const pdata = pdev->dev.platform_data; + struct upboard_led *led; + + /* check & register GPIO LEDs */ + if (strstr(pdata->colour, "gpio")) + return upboard_led_gpio_register(cpld); + + led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL); + if (!led) + return -ENOMEM; + + fldconf.lsb = pdata->bit; + fldconf.msb = pdata->bit; + led->field = devm_regmap_field_alloc(&pdev->dev, cpld->regmap, fldconf); + if (IS_ERR(led->field)) + return PTR_ERR(led->field); + + led->cdev.brightness_get = upboard_led_brightness_get; + led->cdev.brightness_set = upboard_led_brightness_set; + led->cdev.name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "upboard:%s:", pdata->colour); + if (!led->cdev.name) + return -ENOMEM; + + return devm_led_classdev_register(&pdev->dev, &led->cdev); +}; + +static struct platform_driver upboard_led_driver = { + .driver = { + .name = "upboard-led", + }, +}; +module_platform_driver_probe(upboard_led_driver, upboard_led_probe); + +MODULE_AUTHOR("Gary Wang "); +MODULE_DESCRIPTION("UP Board LED driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:upboard-led");