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558 lines
16 KiB
558 lines
16 KiB
From patchwork Mon Mar 20 06:47:26 2017
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Content-Type: text/plain; charset="utf-8"
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MIME-Version: 1.0
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Content-Transfer-Encoding: 7bit
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Subject: [v6,3/4] leds: Add LED support for MT6323 PMIC
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From: sean.wang@mediatek.com
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X-Patchwork-Id: 9633081
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Message-Id: <1489992447-13007-4-git-send-email-sean.wang@mediatek.com>
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To: <rpurdie@rpsys.net>, <jacek.anaszewski@gmail.com>, <lee.jones@linaro.org>,
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<matthias.bgg@gmail.com>, <pavel@ucw.cz>, <robh+dt@kernel.org>,
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<mark.rutland@arm.com>
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Cc: devicetree@vger.kernel.org, keyhaede@gmail.com,
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Sean Wang <sean.wang@mediatek.com>, linux-kernel@vger.kernel.org,
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linux-mediatek@lists.infradead.org, linux-leds@vger.kernel.org,
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linux-arm-kernel@lists.infradead.org
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Date: Mon, 20 Mar 2017 14:47:26 +0800
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From: Sean Wang <sean.wang@mediatek.com>
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MT6323 PMIC is a multi-function device that includes LED function.
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It allows attaching up to 4 LEDs which can either be on, off or dimmed
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and/or blinked with the controller.
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Signed-off-by: Sean Wang <sean.wang@mediatek.com>
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Reviewed-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
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---
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drivers/leds/Kconfig | 8 +
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drivers/leds/Makefile | 1 +
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drivers/leds/leds-mt6323.c | 502 +++++++++++++++++++++++++++++++++++++++++++++
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3 files changed, 511 insertions(+)
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create mode 100644 drivers/leds/leds-mt6323.c
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Index: linux-4.9.17/drivers/leds/Kconfig
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===================================================================
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--- linux-4.9.17.orig/drivers/leds/Kconfig
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+++ linux-4.9.17/drivers/leds/Kconfig
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@@ -117,6 +117,14 @@ config LEDS_MIKROTIK_RB532
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This option enables support for the so called "User LED" of
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Mikrotik's Routerboard 532.
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+config LEDS_MT6323
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+ tristate "LED Support for Mediatek MT6323 PMIC"
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+ depends on LEDS_CLASS
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+ depends on MFD_MT6397
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+ help
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+ This option enables support for on-chip LED drivers found on
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+ Mediatek MT6323 PMIC.
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+
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config LEDS_S3C24XX
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tristate "LED Support for Samsung S3C24XX GPIO LEDs"
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depends on LEDS_CLASS
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Index: linux-4.9.17/drivers/leds/leds-mt6323.c
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===================================================================
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--- /dev/null
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+++ linux-4.9.17/drivers/leds/leds-mt6323.c
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@@ -0,0 +1,502 @@
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+/*
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+ * LED driver for Mediatek MT6323 PMIC
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+ *
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+ * Copyright (C) 2017 Sean Wang <sean.wang@mediatek.com>
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License as
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+ * published by the Free Software Foundation; either version 2 of
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+ * the License, or (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+#include <linux/kernel.h>
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+#include <linux/leds.h>
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+#include <linux/mfd/mt6323/registers.h>
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+#include <linux/mfd/mt6397/core.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/platform_device.h>
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+#include <linux/regmap.h>
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+
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+/*
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+ * Register field for MT6323_TOP_CKPDN0 to enable
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+ * 32K clock common for LED device.
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+ */
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+#define MT6323_RG_DRV_32K_CK_PDN BIT(11)
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+#define MT6323_RG_DRV_32K_CK_PDN_MASK BIT(11)
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+
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+/*
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+ * Register field for MT6323_TOP_CKPDN2 to enable
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+ * individual clock for LED device.
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+ */
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+#define MT6323_RG_ISINK_CK_PDN(i) BIT(i)
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+#define MT6323_RG_ISINK_CK_PDN_MASK(i) BIT(i)
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+
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+/*
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+ * Register field for MT6323_TOP_CKCON1 to select
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+ * clock source.
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+ */
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+#define MT6323_RG_ISINK_CK_SEL_MASK(i) (BIT(10) << (i))
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+
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+/*
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+ * Register for MT6323_ISINK_CON0 to setup the
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+ * duty cycle of the blink.
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+ */
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+#define MT6323_ISINK_CON0(i) (MT6323_ISINK0_CON0 + 0x8 * (i))
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+#define MT6323_ISINK_DIM_DUTY_MASK (0x1f << 8)
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+#define MT6323_ISINK_DIM_DUTY(i) (((i) << 8) & \
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+ MT6323_ISINK_DIM_DUTY_MASK)
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+
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+/* Register to setup the period of the blink. */
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+#define MT6323_ISINK_CON1(i) (MT6323_ISINK0_CON1 + 0x8 * (i))
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+#define MT6323_ISINK_DIM_FSEL_MASK (0xffff)
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+#define MT6323_ISINK_DIM_FSEL(i) ((i) & MT6323_ISINK_DIM_FSEL_MASK)
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+
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+/* Register to control the brightness. */
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+#define MT6323_ISINK_CON2(i) (MT6323_ISINK0_CON2 + 0x8 * (i))
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+#define MT6323_ISINK_CH_STEP_SHIFT 12
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+#define MT6323_ISINK_CH_STEP_MASK (0x7 << 12)
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+#define MT6323_ISINK_CH_STEP(i) (((i) << 12) & \
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+ MT6323_ISINK_CH_STEP_MASK)
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+#define MT6323_ISINK_SFSTR0_TC_MASK (0x3 << 1)
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+#define MT6323_ISINK_SFSTR0_TC(i) (((i) << 1) & \
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+ MT6323_ISINK_SFSTR0_TC_MASK)
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+#define MT6323_ISINK_SFSTR0_EN_MASK BIT(0)
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+#define MT6323_ISINK_SFSTR0_EN BIT(0)
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+
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+/* Register to LED channel enablement. */
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+#define MT6323_ISINK_CH_EN_MASK(i) BIT(i)
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+#define MT6323_ISINK_CH_EN(i) BIT(i)
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+
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+#define MT6323_MAX_PERIOD 10000
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+#define MT6323_MAX_LEDS 4
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+#define MT6323_MAX_BRIGHTNESS 6
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+#define MT6323_UNIT_DUTY 3125
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+#define MT6323_CAL_HW_DUTY(o, p) DIV_ROUND_CLOSEST((o) * 100000ul,\
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+ (p) * MT6323_UNIT_DUTY)
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+
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+struct mt6323_leds;
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+
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+/**
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+ * struct mt6323_led - state container for the LED device
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+ * @id: the identifier in MT6323 LED device
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+ * @parent: the pointer to MT6323 LED controller
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+ * @cdev: LED class device for this LED device
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+ * @current_brightness: current state of the LED device
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+ */
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+struct mt6323_led {
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+ int id;
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+ struct mt6323_leds *parent;
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+ struct led_classdev cdev;
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+ enum led_brightness current_brightness;
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+};
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+
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+/**
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+ * struct mt6323_leds - state container for holding LED controller
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+ * of the driver
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+ * @dev: the device pointer
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+ * @hw: the underlying hardware providing shared
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+ * bus for the register operations
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+ * @lock: the lock among process context
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+ * @led: the array that contains the state of individual
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+ * LED device
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+ */
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+struct mt6323_leds {
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+ struct device *dev;
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+ struct mt6397_chip *hw;
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+ /* protect among process context */
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+ struct mutex lock;
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+ struct mt6323_led *led[MT6323_MAX_LEDS];
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+};
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+
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+static int mt6323_led_hw_brightness(struct led_classdev *cdev,
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+ enum led_brightness brightness)
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+{
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+ struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
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+ struct mt6323_leds *leds = led->parent;
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+ struct regmap *regmap = leds->hw->regmap;
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+ u32 con2_mask = 0, con2_val = 0;
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+ int ret;
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+
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+ /*
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+ * Setup current output for the corresponding
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+ * brightness level.
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+ */
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+ con2_mask |= MT6323_ISINK_CH_STEP_MASK |
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+ MT6323_ISINK_SFSTR0_TC_MASK |
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+ MT6323_ISINK_SFSTR0_EN_MASK;
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+ con2_val |= MT6323_ISINK_CH_STEP(brightness - 1) |
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+ MT6323_ISINK_SFSTR0_TC(2) |
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+ MT6323_ISINK_SFSTR0_EN;
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+
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+ ret = regmap_update_bits(regmap, MT6323_ISINK_CON2(led->id),
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+ con2_mask, con2_val);
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+ return ret;
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+}
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+
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+static int mt6323_led_hw_off(struct led_classdev *cdev)
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+{
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+ struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
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+ struct mt6323_leds *leds = led->parent;
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+ struct regmap *regmap = leds->hw->regmap;
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+ unsigned int status;
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+ int ret;
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+
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+ status = MT6323_ISINK_CH_EN(led->id);
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+ ret = regmap_update_bits(regmap, MT6323_ISINK_EN_CTRL,
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+ MT6323_ISINK_CH_EN_MASK(led->id), ~status);
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+ if (ret < 0)
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+ return ret;
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+
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+ usleep_range(100, 300);
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+ ret = regmap_update_bits(regmap, MT6323_TOP_CKPDN2,
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+ MT6323_RG_ISINK_CK_PDN_MASK(led->id),
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+ MT6323_RG_ISINK_CK_PDN(led->id));
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+ if (ret < 0)
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+ return ret;
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+
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+ return 0;
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+}
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+
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+static enum led_brightness
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+mt6323_get_led_hw_brightness(struct led_classdev *cdev)
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+{
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+ struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
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+ struct mt6323_leds *leds = led->parent;
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+ struct regmap *regmap = leds->hw->regmap;
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+ unsigned int status;
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+ int ret;
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+
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+ ret = regmap_read(regmap, MT6323_TOP_CKPDN2, &status);
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+ if (ret < 0)
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+ return ret;
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+
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+ if (status & MT6323_RG_ISINK_CK_PDN_MASK(led->id))
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+ return 0;
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+
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+ ret = regmap_read(regmap, MT6323_ISINK_EN_CTRL, &status);
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+ if (ret < 0)
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+ return ret;
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+
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+ if (!(status & MT6323_ISINK_CH_EN(led->id)))
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+ return 0;
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+
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+ ret = regmap_read(regmap, MT6323_ISINK_CON2(led->id), &status);
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+ if (ret < 0)
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+ return ret;
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+
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+ return ((status & MT6323_ISINK_CH_STEP_MASK)
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+ >> MT6323_ISINK_CH_STEP_SHIFT) + 1;
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+}
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+
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+static int mt6323_led_hw_on(struct led_classdev *cdev,
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+ enum led_brightness brightness)
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+{
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+ struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
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+ struct mt6323_leds *leds = led->parent;
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+ struct regmap *regmap = leds->hw->regmap;
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+ unsigned int status;
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+ int ret;
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+
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+ /*
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+ * Setup required clock source, enable the corresponding
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+ * clock and channel and let work with continuous blink as
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+ * the default.
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+ */
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+ ret = regmap_update_bits(regmap, MT6323_TOP_CKCON1,
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+ MT6323_RG_ISINK_CK_SEL_MASK(led->id), 0);
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+ if (ret < 0)
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+ return ret;
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+
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+ status = MT6323_RG_ISINK_CK_PDN(led->id);
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+ ret = regmap_update_bits(regmap, MT6323_TOP_CKPDN2,
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+ MT6323_RG_ISINK_CK_PDN_MASK(led->id),
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+ ~status);
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+ if (ret < 0)
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+ return ret;
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+
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+ usleep_range(100, 300);
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+
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+ ret = regmap_update_bits(regmap, MT6323_ISINK_EN_CTRL,
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+ MT6323_ISINK_CH_EN_MASK(led->id),
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+ MT6323_ISINK_CH_EN(led->id));
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+ if (ret < 0)
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+ return ret;
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+
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+ ret = mt6323_led_hw_brightness(cdev, brightness);
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+ if (ret < 0)
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+ return ret;
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+
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+ ret = regmap_update_bits(regmap, MT6323_ISINK_CON0(led->id),
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+ MT6323_ISINK_DIM_DUTY_MASK,
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+ MT6323_ISINK_DIM_DUTY(31));
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+ if (ret < 0)
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+ return ret;
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+
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+ ret = regmap_update_bits(regmap, MT6323_ISINK_CON1(led->id),
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+ MT6323_ISINK_DIM_FSEL_MASK,
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+ MT6323_ISINK_DIM_FSEL(1000));
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+ if (ret < 0)
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+ return ret;
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+
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+ return 0;
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+}
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+
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+static int mt6323_led_set_blink(struct led_classdev *cdev,
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+ unsigned long *delay_on,
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+ unsigned long *delay_off)
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+{
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+ struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
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+ struct mt6323_leds *leds = led->parent;
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+ struct regmap *regmap = leds->hw->regmap;
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+ unsigned long period;
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+ u8 duty_hw;
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+ int ret;
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+
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+ /*
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+ * Units are in ms, if over the hardware able
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+ * to support, fallback into software blink
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+ */
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+ period = *delay_on + *delay_off;
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+
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+ if (period > MT6323_MAX_PERIOD)
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+ return -EINVAL;
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+
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+ /*
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+ * LED subsystem requires a default user
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+ * friendly blink pattern for the LED so using
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+ * 1Hz duty cycle 50% here if without specific
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+ * value delay_on and delay off being assigned.
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+ */
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+ if (!*delay_on && !*delay_off) {
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+ *delay_on = 500;
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+ *delay_off = 500;
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+ }
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+
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+ /*
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+ * Calculate duty_hw based on the percentage of period during
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+ * which the led is ON.
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+ */
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+ duty_hw = MT6323_CAL_HW_DUTY(*delay_on, period);
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+
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+ /* hardware doesn't support zero duty cycle. */
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+ if (!duty_hw)
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+ return -EINVAL;
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+
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+ mutex_lock(&leds->lock);
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+ /*
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+ * Set max_brightness as the software blink behavior
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+ * when no blink brightness.
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+ */
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+ if (!led->current_brightness) {
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+ ret = mt6323_led_hw_on(cdev, cdev->max_brightness);
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+ if (ret < 0)
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+ goto out;
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+ led->current_brightness = cdev->max_brightness;
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+ }
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+
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+ ret = regmap_update_bits(regmap, MT6323_ISINK_CON0(led->id),
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+ MT6323_ISINK_DIM_DUTY_MASK,
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+ MT6323_ISINK_DIM_DUTY(duty_hw - 1));
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+ if (ret < 0)
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+ goto out;
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+
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+ ret = regmap_update_bits(regmap, MT6323_ISINK_CON1(led->id),
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+ MT6323_ISINK_DIM_FSEL_MASK,
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+ MT6323_ISINK_DIM_FSEL(period - 1));
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+out:
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+ mutex_unlock(&leds->lock);
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+
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+ return ret;
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+}
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+
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+static int mt6323_led_set_brightness(struct led_classdev *cdev,
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+ enum led_brightness brightness)
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+{
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+ struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
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+ struct mt6323_leds *leds = led->parent;
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+ int ret;
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+
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+ mutex_lock(&leds->lock);
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+
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+ if (!led->current_brightness && brightness) {
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+ ret = mt6323_led_hw_on(cdev, brightness);
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+ if (ret < 0)
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+ goto out;
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+ } else if (brightness) {
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+ ret = mt6323_led_hw_brightness(cdev, brightness);
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+ if (ret < 0)
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+ goto out;
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+ } else {
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+ ret = mt6323_led_hw_off(cdev);
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+ if (ret < 0)
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+ goto out;
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+ }
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+
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+ led->current_brightness = brightness;
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+out:
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+ mutex_unlock(&leds->lock);
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+
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+ return ret;
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+}
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+
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+static int mt6323_led_set_dt_default(struct led_classdev *cdev,
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+ struct device_node *np)
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+{
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+ struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev);
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+ const char *state;
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+ int ret = 0;
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+
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+ led->cdev.name = of_get_property(np, "label", NULL) ? : np->name;
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+ led->cdev.default_trigger = of_get_property(np,
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+ "linux,default-trigger",
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+ NULL);
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+
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+ state = of_get_property(np, "default-state", NULL);
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+ if (state) {
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+ if (!strcmp(state, "keep")) {
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+ ret = mt6323_get_led_hw_brightness(cdev);
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+ if (ret < 0)
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+ return ret;
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+ led->current_brightness = ret;
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+ ret = 0;
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+ } else if (!strcmp(state, "on")) {
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+ ret =
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+ mt6323_led_set_brightness(cdev, cdev->max_brightness);
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+ } else {
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+ ret = mt6323_led_set_brightness(cdev, LED_OFF);
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+ }
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+ }
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+
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+ return ret;
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+}
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+
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+static int mt6323_led_probe(struct platform_device *pdev)
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+{
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+ struct device *dev = &pdev->dev;
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+ struct device_node *np = pdev->dev.of_node;
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|
+ struct device_node *child;
|
|
+ struct mt6397_chip *hw = dev_get_drvdata(pdev->dev.parent);
|
|
+ struct mt6323_leds *leds;
|
|
+ struct mt6323_led *led;
|
|
+ int ret;
|
|
+ unsigned int status;
|
|
+ u32 reg;
|
|
+
|
|
+ leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
|
|
+ if (!leds)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ platform_set_drvdata(pdev, leds);
|
|
+ leds->dev = dev;
|
|
+
|
|
+ /*
|
|
+ * leds->hw points to the underlying bus for the register
|
|
+ * controlled.
|
|
+ */
|
|
+ leds->hw = hw;
|
|
+ mutex_init(&leds->lock);
|
|
+
|
|
+ status = MT6323_RG_DRV_32K_CK_PDN;
|
|
+ ret = regmap_update_bits(leds->hw->regmap, MT6323_TOP_CKPDN0,
|
|
+ MT6323_RG_DRV_32K_CK_PDN_MASK, ~status);
|
|
+ if (ret < 0) {
|
|
+ dev_err(leds->dev,
|
|
+ "Failed to update MT6323_TOP_CKPDN0 Register\n");
|
|
+ return ret;
|
|
+ }
|
|
+
|
|
+ for_each_available_child_of_node(np, child) {
|
|
+ ret = of_property_read_u32(child, "reg", ®);
|
|
+ if (ret) {
|
|
+ dev_err(dev, "Failed to read led 'reg' property\n");
|
|
+ goto put_child_node;
|
|
+ }
|
|
+
|
|
+ if (reg < 0 || reg > MT6323_MAX_LEDS || leds->led[reg]) {
|
|
+ dev_err(dev, "Invalid led reg %u\n", reg);
|
|
+ ret = -EINVAL;
|
|
+ goto put_child_node;
|
|
+ }
|
|
+
|
|
+ led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
|
|
+ if (!led) {
|
|
+ ret = -ENOMEM;
|
|
+ goto put_child_node;
|
|
+ }
|
|
+
|
|
+ leds->led[reg] = led;
|
|
+ leds->led[reg]->id = reg;
|
|
+ leds->led[reg]->cdev.max_brightness = MT6323_MAX_BRIGHTNESS;
|
|
+ leds->led[reg]->cdev.brightness_set_blocking =
|
|
+ mt6323_led_set_brightness;
|
|
+ leds->led[reg]->cdev.blink_set = mt6323_led_set_blink;
|
|
+ leds->led[reg]->cdev.brightness_get =
|
|
+ mt6323_get_led_hw_brightness;
|
|
+ leds->led[reg]->parent = leds;
|
|
+
|
|
+ ret = mt6323_led_set_dt_default(&leds->led[reg]->cdev, child);
|
|
+ if (ret < 0) {
|
|
+ dev_err(leds->dev,
|
|
+ "Failed to LED set default from devicetree\n");
|
|
+ goto put_child_node;
|
|
+ }
|
|
+
|
|
+ ret = devm_led_classdev_register(dev, &leds->led[reg]->cdev);
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "Failed to register LED: %d\n",
|
|
+ ret);
|
|
+ goto put_child_node;
|
|
+ }
|
|
+ leds->led[reg]->cdev.dev->of_node = child;
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+
|
|
+put_child_node:
|
|
+ of_node_put(child);
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int mt6323_led_remove(struct platform_device *pdev)
|
|
+{
|
|
+ struct mt6323_leds *leds = platform_get_drvdata(pdev);
|
|
+ int i;
|
|
+
|
|
+ /* Turn the LEDs off on driver removal. */
|
|
+ for (i = 0 ; leds->led[i] ; i++)
|
|
+ mt6323_led_hw_off(&leds->led[i]->cdev);
|
|
+
|
|
+ regmap_update_bits(leds->hw->regmap, MT6323_TOP_CKPDN0,
|
|
+ MT6323_RG_DRV_32K_CK_PDN_MASK,
|
|
+ MT6323_RG_DRV_32K_CK_PDN);
|
|
+
|
|
+ mutex_destroy(&leds->lock);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static const struct of_device_id mt6323_led_dt_match[] = {
|
|
+ { .compatible = "mediatek,mt6323-led" },
|
|
+ {},
|
|
+};
|
|
+MODULE_DEVICE_TABLE(of, mt6323_led_dt_match);
|
|
+
|
|
+static struct platform_driver mt6323_led_driver = {
|
|
+ .probe = mt6323_led_probe,
|
|
+ .remove = mt6323_led_remove,
|
|
+ .driver = {
|
|
+ .name = "mt6323-led",
|
|
+ .of_match_table = mt6323_led_dt_match,
|
|
+ },
|
|
+};
|
|
+
|
|
+module_platform_driver(mt6323_led_driver);
|
|
+
|
|
+MODULE_DESCRIPTION("LED driver for Mediatek MT6323 PMIC");
|
|
+MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
|
|
+MODULE_LICENSE("GPL");
|
|
|