From patchwork Sun Apr 30 19:59:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 678098 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 72205C77B7C for ; Sun, 30 Apr 2023 20:01:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229566AbjD3UA7 (ORCPT ); Sun, 30 Apr 2023 16:00:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52036 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231259AbjD3UA6 (ORCPT ); Sun, 30 Apr 2023 16:00:58 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E59D5E47 for ; Sun, 30 Apr 2023 13:00:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1682884809; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=KNo1S+xdE4zW7WLOikSpF7IKsrkn8JFnjLjPWGcoGpA=; b=DpSSgV0xg0lh0s2uAgDBVt3jDtKG08qLpX/7+FLeXgw1pM6t5fHMyNy1nF/FIcY+6IwmVn +S7xIKAc/Ra1WNBnwQA1rxo4+da5qHgr4AU/k8hOS5TQstmvr6M7BzzA1gBdgrCFwFEMmZ fsFD2RQ95y17O2dlKX6NJgYWz90DdHo= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-651-XUZDrYNTOwiIx0sBsLEobw-1; Sun, 30 Apr 2023 16:00:03 -0400 X-MC-Unique: XUZDrYNTOwiIx0sBsLEobw-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id EB5A085C1A5; Sun, 30 Apr 2023 20:00:02 +0000 (UTC) Received: from localhost.localdomain (unknown [10.39.192.59]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0E9AEC15BA0; Sun, 30 Apr 2023 20:00:01 +0000 (UTC) From: Hans de Goede To: Pavel Machek , Lee Jones Cc: Hans de Goede , Jacek Anaszewski , Yauhen Kharuzhy , linux-leds@vger.kernel.org Subject: [PATCH v3 1/5] leds: Add Intel Cherry Trail Whiskey Cove PMIC LED driver Date: Sun, 30 Apr 2023 21:59:48 +0200 Message-Id: <20230430195952.862527-2-hdegoede@redhat.com> In-Reply-To: <20230430195952.862527-1-hdegoede@redhat.com> References: <20230430195952.862527-1-hdegoede@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org From: Yauhen Kharuzhy Add support for LEDs connected to the Intel Cherry Trail Whiskey Cove PMIC. Charger and general-purpose LEDs are supported. Hardware blinking is implemented, breathing is not. This driver was tested with Lenovo Yoga Book notebook. Changes by Hans de Goede (in response to review of v2): - Since the PMIC is connected to the battery any changes we make to the LED settings are permanent, even surviving reboot / poweroff. Save LED1 register settings on probe() and if auto-/hw-control was enabled on probe() restore the settings on remove() and shutdown(). - Delay switching LED1 to software control mode to first brightness write. - Use dynamically allocated drvdata instead of a global drvdata variable. - Ensure the LED is on when activating blinking. - Fix CHT_WC_LED_EFF_BREATHING val ((3 << 1) rather then BIT(3)). Link: https://lore.kernel.org/r/20190212205901.13037-2-jekhor@gmail.com Signed-off-by: Yauhen Kharuzhy Co-developed-by: Hans de Goede Signed-off-by: Hans de Goede --- Changes in v3: - Some comment tweaks and s/LED_OFF/0/ - Refuse to load on the Yoga Tab 3 as it turns out the LED1 driver output is connected to a haptic feedback motor there (and LED2 is unused) Changes in v2: - Update comment about YB1 kernel source usage for register info - Replace "cht-wc::" LED name prefix with "platform::" - Add leds-cht-wcove to list of drivers using "platform::charging" in Documentation/leds/well-known-leds.txt - Bail from cht_wc_leds_brightness_set() on first error - Make default blink 1Hz, like sw-blink default blink --- Documentation/leds/well-known-leds.txt | 2 +- drivers/leds/Kconfig | 11 + drivers/leds/Makefile | 1 + drivers/leds/leds-cht-wcove.c | 380 +++++++++++++++++++++++++ 4 files changed, 393 insertions(+), 1 deletion(-) create mode 100644 drivers/leds/leds-cht-wcove.c diff --git a/Documentation/leds/well-known-leds.txt b/Documentation/leds/well-known-leds.txt index 2160382c86be..7640debee6c0 100644 --- a/Documentation/leds/well-known-leds.txt +++ b/Documentation/leds/well-known-leds.txt @@ -65,7 +65,7 @@ Phones usually have multi-color status LED. * Power management -Good: "platform:*:charging" (allwinner sun50i) +Good: "platform:*:charging" (allwinner sun50i, leds-cht-wcove) * Screen diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 9dbce09eabac..90835716f14a 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -122,6 +122,17 @@ config LEDS_BCM6358 This option enables support for LEDs connected to the BCM6358 LED HW controller accessed via MMIO registers. +config LEDS_CHT_WCOVE + tristate "LED support for Intel Cherry Trail Whiskey Cove PMIC" + depends on LEDS_CLASS + depends on INTEL_SOC_PMIC_CHTWC + help + This option enables support for charger and general purpose LEDs + connected to the Intel Cherrytrail Whiskey Cove PMIC. + + To compile this driver as a module, choose M here: the module + will be called leds-cht-wcove. + config LEDS_CPCAP tristate "LED Support for Motorola CPCAP" depends on LEDS_CLASS diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index d30395d11fd8..78b5b69f9c54 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -19,6 +19,7 @@ obj-$(CONFIG_LEDS_BCM6328) += leds-bcm6328.o obj-$(CONFIG_LEDS_BCM6358) += leds-bcm6358.o obj-$(CONFIG_LEDS_BD2802) += leds-bd2802.o obj-$(CONFIG_LEDS_BLINKM) += leds-blinkm.o +obj-$(CONFIG_LEDS_CHT_WCOVE) += leds-cht-wcove.o obj-$(CONFIG_LEDS_CLEVO_MAIL) += leds-clevo-mail.o obj-$(CONFIG_LEDS_COBALT_QUBE) += leds-cobalt-qube.o obj-$(CONFIG_LEDS_COBALT_RAQ) += leds-cobalt-raq.o diff --git a/drivers/leds/leds-cht-wcove.c b/drivers/leds/leds-cht-wcove.c new file mode 100644 index 000000000000..9fe76a0c62c8 --- /dev/null +++ b/drivers/leds/leds-cht-wcove.c @@ -0,0 +1,380 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for LEDs connected to the Intel Cherry Trail Whiskey Cove PMIC + * + * Copyright 2019 Yauhen Kharuzhy + * Copyright 2023 Hans de Goede + * + * Register info comes from the Lenovo Yoga Book Android opensource code + * available from Lenovo. File lenovo_yb1_x90f_l_osc_201803.7z path in the 7z: + * YB1_source_code/kernel/cht/drivers/misc/charger_gp_led.c + */ + +#include +#include +#include +#include +#include +#include +#include + +#define CHT_WC_LED1_CTRL 0x5e1f +#define CHT_WC_LED1_FSM 0x5e20 +#define CHT_WC_LED1_PWM 0x5e21 + +#define CHT_WC_LED2_CTRL 0x4fdf +#define CHT_WC_LED2_FSM 0x4fe0 +#define CHT_WC_LED2_PWM 0x4fe1 + +#define CHT_WC_LED1_SWCTL BIT(0) /* HW or SW control of charging led */ +#define CHT_WC_LED1_ON BIT(1) + +#define CHT_WC_LED2_ON BIT(0) +#define CHT_WC_LED_I_MA2_5 (2 << 2) /* LED current limit */ +#define CHT_WC_LED_I_MASK GENMASK(3, 2) /* LED current limit mask */ + +#define CHT_WC_LED_F_1_4_HZ (0 << 4) +#define CHT_WC_LED_F_1_2_HZ (1 << 4) +#define CHT_WC_LED_F_1_HZ (2 << 4) +#define CHT_WC_LED_F_2_HZ (3 << 4) +#define CHT_WC_LED_F_MASK GENMASK(5, 4) + +#define CHT_WC_LED_EFF_OFF (0 << 1) +#define CHT_WC_LED_EFF_ON (1 << 1) +#define CHT_WC_LED_EFF_BLINKING (2 << 1) +#define CHT_WC_LED_EFF_BREATHING (3 << 1) +#define CHT_WC_LED_EFF_MASK GENMASK(2, 1) + +#define CHT_WC_LED_COUNT 2 + +struct cht_wc_led_regs { + /* Register addresses */ + u16 ctrl; + u16 fsm; + u16 pwm; + /* Mask + values for turning the LED on/off */ + u8 on_off_mask; + u8 on_val; + u8 off_val; +}; + +struct cht_wc_led_saved_regs { + unsigned int ctrl; + unsigned int fsm; + unsigned int pwm; +}; + +struct cht_wc_led { + struct led_classdev cdev; + const struct cht_wc_led_regs *regs; + struct regmap *regmap; + struct mutex mutex; +}; + +struct cht_wc_leds { + struct cht_wc_led leds[CHT_WC_LED_COUNT]; + /* Saved LED1 initial register values */ + struct cht_wc_led_saved_regs led1_initial_regs; +}; + +static const struct cht_wc_led_regs cht_wc_led_regs[CHT_WC_LED_COUNT] = { + { + .ctrl = CHT_WC_LED1_CTRL, + .fsm = CHT_WC_LED1_FSM, + .pwm = CHT_WC_LED1_PWM, + .on_off_mask = CHT_WC_LED1_SWCTL | CHT_WC_LED1_ON, + .on_val = CHT_WC_LED1_SWCTL | CHT_WC_LED1_ON, + .off_val = CHT_WC_LED1_SWCTL, + }, + { + .ctrl = CHT_WC_LED2_CTRL, + .fsm = CHT_WC_LED2_FSM, + .pwm = CHT_WC_LED2_PWM, + .on_off_mask = CHT_WC_LED2_ON, + .on_val = CHT_WC_LED2_ON, + .off_val = 0, + }, +}; + +static const char * const cht_wc_leds_names[CHT_WC_LED_COUNT] = { + "platform::" LED_FUNCTION_CHARGING, + "platform::" LED_FUNCTION_INDICATOR, +}; + +static int cht_wc_leds_brightness_set(struct led_classdev *cdev, + enum led_brightness value) +{ + struct cht_wc_led *led = container_of(cdev, struct cht_wc_led, cdev); + int ret; + + mutex_lock(&led->mutex); + + if (!value) { + ret = regmap_update_bits(led->regmap, led->regs->ctrl, + led->regs->on_off_mask, led->regs->off_val); + if (ret < 0) { + dev_err(cdev->dev, "Failed to turn off: %d\n", ret); + goto out; + } + + /* Disable HW blinking */ + ret = regmap_update_bits(led->regmap, led->regs->fsm, + CHT_WC_LED_EFF_MASK, CHT_WC_LED_EFF_ON); + if (ret < 0) + dev_err(cdev->dev, "Failed to update LED FSM reg: %d\n", ret); + } else { + ret = regmap_write(led->regmap, led->regs->pwm, value); + if (ret < 0) { + dev_err(cdev->dev, "Failed to set brightness: %d\n", ret); + goto out; + } + + ret = regmap_update_bits(led->regmap, led->regs->ctrl, + led->regs->on_off_mask, led->regs->on_val); + if (ret < 0) + dev_err(cdev->dev, "Failed to turn on: %d\n", ret); + } +out: + mutex_unlock(&led->mutex); + return ret; +} + +enum led_brightness cht_wc_leds_brightness_get(struct led_classdev *cdev) +{ + struct cht_wc_led *led = container_of(cdev, struct cht_wc_led, cdev); + unsigned int val; + int ret; + + mutex_lock(&led->mutex); + + ret = regmap_read(led->regmap, led->regs->ctrl, &val); + if (ret < 0) { + dev_err(cdev->dev, "Failed to read LED CTRL reg: %d\n", ret); + ret = 0; + goto done; + } + + val &= led->regs->on_off_mask; + if (val != led->regs->on_val) { + ret = 0; + goto done; + } + + ret = regmap_read(led->regmap, led->regs->pwm, &val); + if (ret < 0) { + dev_err(cdev->dev, "Failed to read LED PWM reg: %d\n", ret); + ret = 0; + goto done; + } + + ret = val; +done: + mutex_unlock(&led->mutex); + + return ret; +} + +/* Return blinking period for given CTRL reg value */ +static unsigned long cht_wc_leds_get_period(int ctrl) +{ + ctrl &= CHT_WC_LED_F_MASK; + + switch (ctrl) { + case CHT_WC_LED_F_1_4_HZ: + return 1000 * 4; + case CHT_WC_LED_F_1_2_HZ: + return 1000 * 2; + case CHT_WC_LED_F_1_HZ: + return 1000; + case CHT_WC_LED_F_2_HZ: + return 1000 / 2; + }; + + return 0; +} + +/* + * Find suitable hardware blink mode for given period. + * period < 750 ms - select 2 HZ + * 750 ms <= period < 1500 ms - select 1 HZ + * 1500 ms <= period < 3000 ms - select 1/2 HZ + * 3000 ms <= period < 5000 ms - select 1/4 HZ + * 5000 ms <= period - return -1 + */ +static int cht_wc_leds_find_freq(unsigned long period) +{ + if (period < 750) + return CHT_WC_LED_F_2_HZ; + else if (period < 1500) + return CHT_WC_LED_F_1_HZ; + else if (period < 3000) + return CHT_WC_LED_F_1_2_HZ; + else if (period < 5000) + return CHT_WC_LED_F_1_4_HZ; + else + return -1; +} + +static int cht_wc_leds_blink_set(struct led_classdev *cdev, + unsigned long *delay_on, + unsigned long *delay_off) +{ + struct cht_wc_led *led = container_of(cdev, struct cht_wc_led, cdev); + unsigned int ctrl; + int ret; + + mutex_lock(&led->mutex); + + /* Blink with 1 Hz as default if nothing specified */ + if (!*delay_on && !*delay_off) + *delay_on = *delay_off = 500; + + ctrl = cht_wc_leds_find_freq(*delay_on + *delay_off); + if (ctrl < 0) { + /* Disable HW blinking */ + ret = regmap_update_bits(led->regmap, led->regs->fsm, + CHT_WC_LED_EFF_MASK, CHT_WC_LED_EFF_ON); + if (ret < 0) + dev_err(cdev->dev, "Failed to update LED FSM reg: %d\n", ret); + + /* Fallback to software timer */ + *delay_on = *delay_off = 0; + ret = -EINVAL; + goto done; + } + + ret = regmap_update_bits(led->regmap, led->regs->fsm, + CHT_WC_LED_EFF_MASK, CHT_WC_LED_EFF_BLINKING); + if (ret < 0) + dev_err(cdev->dev, "Failed to update LED FSM reg: %d\n", ret); + + /* Set the frequency and make sure the LED is on */ + ret = regmap_update_bits(led->regmap, led->regs->ctrl, + CHT_WC_LED_F_MASK | led->regs->on_off_mask, + ctrl | led->regs->on_val); + if (ret < 0) + dev_err(cdev->dev, "Failed to update LED CTRL reg: %d\n", ret); + + *delay_off = *delay_on = cht_wc_leds_get_period(ctrl) / 2; + +done: + mutex_unlock(&led->mutex); + + return ret; +} + +static int cht_wc_led_save_regs(struct cht_wc_led *led, + struct cht_wc_led_saved_regs *saved_regs) +{ + int ret; + + ret = regmap_read(led->regmap, led->regs->ctrl, &saved_regs->ctrl); + if (ret < 0) + return ret; + + ret = regmap_read(led->regmap, led->regs->fsm, &saved_regs->fsm); + if (ret < 0) + return ret; + + return regmap_read(led->regmap, led->regs->pwm, &saved_regs->pwm); +} + +static void cht_wc_led_restore_regs(struct cht_wc_led *led, + const struct cht_wc_led_saved_regs *saved_regs) +{ + regmap_write(led->regmap, led->regs->ctrl, saved_regs->ctrl); + regmap_write(led->regmap, led->regs->fsm, saved_regs->fsm); + regmap_write(led->regmap, led->regs->pwm, saved_regs->pwm); +} + +static int cht_wc_leds_probe(struct platform_device *pdev) +{ + struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent); + struct cht_wc_leds *leds; + int ret; + int i; + + /* + * On the Lenovo Yoga Tab 3 the LED1 driver output is actually + * connected to a haptic feedback motor rather then a LED. + * So do not register a LED classdev there (LED2 is unused). + */ + if (pmic->cht_wc_model == INTEL_CHT_WC_LENOVO_YT3_X90) + return -ENODEV; + + leds = devm_kzalloc(&pdev->dev, sizeof(*leds), GFP_KERNEL); + if (!leds) + return -ENOMEM; + + /* + * LED1 might be in hw-controlled mode when this driver gets loaded; and + * since the PMIC is always powered by the battery any changes made are + * permanent. Save LED1 regs to restore them on remove() or shutdown(). + */ + leds->leds[0].regs = &cht_wc_led_regs[0]; + leds->leds[0].regmap = pmic->regmap; + ret = cht_wc_led_save_regs(&leds->leds[0], &leds->led1_initial_regs); + if (ret < 0) + return ret; + + for (i = 0; i < CHT_WC_LED_COUNT; i++) { + struct cht_wc_led *led = &leds->leds[i]; + + led->regs = &cht_wc_led_regs[i]; + led->regmap = pmic->regmap; + mutex_init(&led->mutex); + led->cdev.name = cht_wc_leds_names[i]; + led->cdev.brightness_set_blocking = cht_wc_leds_brightness_set; + led->cdev.brightness_get = cht_wc_leds_brightness_get; + led->cdev.blink_set = cht_wc_leds_blink_set; + led->cdev.max_brightness = 255; + + ret = led_classdev_register(&pdev->dev, &led->cdev); + if (ret < 0) + return ret; + } + + platform_set_drvdata(pdev, leds); + return 0; +} + +static void cht_wc_leds_remove(struct platform_device *pdev) +{ + struct cht_wc_leds *leds = platform_get_drvdata(pdev); + int i; + + for (i = 0; i < CHT_WC_LED_COUNT; i++) + led_classdev_unregister(&leds->leds[i].cdev); + + /* Restore LED1 regs if hw-control was active else leave LED1 off */ + if (!(leds->led1_initial_regs.ctrl & CHT_WC_LED1_SWCTL)) + cht_wc_led_restore_regs(&leds->leds[0], &leds->led1_initial_regs); +} + +static void cht_wc_leds_disable(struct platform_device *pdev) +{ + struct cht_wc_leds *leds = platform_get_drvdata(pdev); + int i; + + for (i = 0; i < CHT_WC_LED_COUNT; i++) + cht_wc_leds_brightness_set(&leds->leds[i].cdev, 0); + + /* Restore LED1 regs if hw-control was active else leave LED1 off */ + if (!(leds->led1_initial_regs.ctrl & CHT_WC_LED1_SWCTL)) + cht_wc_led_restore_regs(&leds->leds[0], &leds->led1_initial_regs); +} + +static struct platform_driver cht_wc_leds_driver = { + .probe = cht_wc_leds_probe, + .remove_new = cht_wc_leds_remove, + .shutdown = cht_wc_leds_disable, + .driver = { + .name = "cht_wcove_leds", + }, +}; +module_platform_driver(cht_wc_leds_driver); + +MODULE_ALIAS("platform:cht_wcove_leds"); +MODULE_DESCRIPTION("Intel Cherry Trail Whiskey Cove PMIC LEDs driver"); +MODULE_AUTHOR("Yauhen Kharuzhy "); +MODULE_LICENSE("GPL");