| Message ID | 1487311560-26684-4-git-send-email-sean.wang@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Sean, Thanks for the updated patch. I have one more comment below. On 02/17/2017 07:05 AM, sean.wang@mediatek.com wrote: > From: Sean Wang <sean.wang@mediatek.com> > > MT6323 PMIC is a multi-function device that includes > LED function. It allows attaching up to 4 LEDs which > can either be on, off or dimmed and/or blinked with > the controller. > > Signed-off-by: Sean Wang <sean.wang@mediatek.com> > --- > drivers/leds/Kconfig | 8 + > drivers/leds/Makefile | 1 + > drivers/leds/leds-mt6323.c | 470 +++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 479 insertions(+) > create mode 100644 drivers/leds/leds-mt6323.c > > diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig > index c621cbb..30095fc 100644 > --- a/drivers/leds/Kconfig > +++ b/drivers/leds/Kconfig > @@ -117,6 +117,14 @@ config LEDS_MIKROTIK_RB532 > This option enables support for the so called "User LED" of > Mikrotik's Routerboard 532. > > +config LEDS_MT6323 > + tristate "LED Support for Mediatek MT6323 PMIC" > + depends on LEDS_CLASS > + depends on MFD_MT6397 > + help > + This option enables support for on-chip LED drivers found on > + Mediatek MT6323 PMIC. > + > config LEDS_S3C24XX > tristate "LED Support for Samsung S3C24XX GPIO LEDs" > depends on LEDS_CLASS > diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile > index 6b82737..4feb332 100644 > --- a/drivers/leds/Makefile > +++ b/drivers/leds/Makefile > @@ -72,6 +72,7 @@ obj-$(CONFIG_LEDS_IS31FL32XX) += leds-is31fl32xx.o > obj-$(CONFIG_LEDS_PM8058) += leds-pm8058.o > obj-$(CONFIG_LEDS_MLXCPLD) += leds-mlxcpld.o > obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o > +obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o > > # LED SPI Drivers > obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o > diff --git a/drivers/leds/leds-mt6323.c b/drivers/leds/leds-mt6323.c > new file mode 100644 > index 0000000..f431b1d > --- /dev/null > +++ b/drivers/leds/leds-mt6323.c > @@ -0,0 +1,470 @@ > +/* > + * LED driver for Mediatek MT6323 PMIC > + * > + * Copyright (C) 2017 Sean Wang <sean.wang@mediatek.com> > + * > + * 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. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + */ > +#include <linux/kernel.h> > +#include <linux/leds.h> > +#include <linux/mfd/mt6323/registers.h> > +#include <linux/mfd/mt6397/core.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/regmap.h> > + > +/* > + * Register field for MT6323_TOP_CKPDN0 to enable > + * 32K clock common for LED device. > + */ > +#define MT6323_RG_DRV_32K_CK_PDN BIT(11) > +#define MT6323_RG_DRV_32K_CK_PDN_MASK BIT(11) > + > +/* > + * Register field for MT6323_TOP_CKPDN2 to enable > + * individual clock for LED device. > + */ > +#define MT6323_RG_ISINK_CK_PDN(i) BIT(i) > +#define MT6323_RG_ISINK_CK_PDN_MASK(i) BIT(i) > + > +/* > + * Register field for MT6323_TOP_CKCON1 to select > + * clock source. > + */ > +#define MT6323_RG_ISINK_CK_SEL_MASK(i) (BIT(10) << (i)) > + > +/* > + * Register for MT6323_ISINK_CON0 to setup the > + * duty cycle of the blink. > + */ > +#define MT6323_ISINK_CON0(i) (MT6323_ISINK0_CON0 + 0x8 * (i)) > +#define MT6323_ISINK_DIM_DUTY_MASK (0x1f << 8) > +#define MT6323_ISINK_DIM_DUTY(i) (((i) << 8) & \ > + MT6323_ISINK_DIM_DUTY_MASK) > + > +/* Register to setup the period of the blink. */ > +#define MT6323_ISINK_CON1(i) (MT6323_ISINK0_CON1 + 0x8 * (i)) > +#define MT6323_ISINK_DIM_FSEL_MASK (0xffff) > +#define MT6323_ISINK_DIM_FSEL(i) ((i) & MT6323_ISINK_DIM_FSEL_MASK) > + > +/* Register to control the brightness. */ > +#define MT6323_ISINK_CON2(i) (MT6323_ISINK0_CON2 + 0x8 * (i)) > +#define MT6323_ISINK_CH_STEP_SHIFT 12 > +#define MT6323_ISINK_CH_STEP_MASK (0x7 << 12) > +#define MT6323_ISINK_CH_STEP(i) (((i) << 12) & \ > + MT6323_ISINK_CH_STEP_MASK) > +#define MT6323_ISINK_SFSTR0_TC_MASK (0x3 << 1) > +#define MT6323_ISINK_SFSTR0_TC(i) (((i) << 1) & \ > + MT6323_ISINK_SFSTR0_TC_MASK) > +#define MT6323_ISINK_SFSTR0_EN_MASK BIT(0) > +#define MT6323_ISINK_SFSTR0_EN BIT(0) > + > +/* Register to LED channel enablement. */ > +#define MT6323_ISINK_CH_EN_MASK(i) BIT(i) > +#define MT6323_ISINK_CH_EN(i) BIT(i) > + > +#define MT6323_MAX_PERIOD 10000 > +#define MT6323_MAX_LEDS 4 > +#define MT6323_MAX_BRIGHTNESS 6 > +#define MT6323_UNIT_DUTY 3125 > + > +struct mt6323_leds; > + > +/** > + * struct mt6323_led - state container for the LED device > + * @id: the identifier in MT6323 LED device > + * @parent: the pointer to MT6323 LED controller > + * @cdev: LED class device for this LED device > + * @current_brightness: current state of the LED device > + */ > +struct mt6323_led { > + int id; > + struct mt6323_leds *parent; > + struct led_classdev cdev; > + u8 current_brightness; > +}; > + > +/** > + * struct mt6323_leds - state container for holding LED controller > + * of the driver > + * @dev: the device pointer > + * @hw: the underlying hardware providing shared > + * bus for the register operations > + * @led_num: how much the LED device the controller could control > + * @lock: the lock among process context > + * @led: the array that contains the state of individual > + * LED device > + */ > +struct mt6323_leds { > + struct device *dev; > + struct mt6397_chip *hw; > + u8 led_num; > + /* protect among process context */ > + struct mutex lock; > + struct mt6323_led led[MT6323_MAX_LEDS]; > +}; > + > +static int mt6323_led_hw_off(struct led_classdev *cdev) > +{ > + struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); > + struct mt6323_leds *leds = led->parent; > + struct regmap *regmap = leds->hw->regmap; > + unsigned int status; > + int ret; > + > + status = MT6323_ISINK_CH_EN(led->id); > + ret = regmap_update_bits(regmap, MT6323_ISINK_EN_CTRL, > + MT6323_ISINK_CH_EN_MASK(led->id), ~status); > + if (ret < 0) > + return ret; > + > + usleep_range(100, 300); > + ret = regmap_update_bits(regmap, MT6323_TOP_CKPDN2, > + MT6323_RG_ISINK_CK_PDN_MASK(led->id), > + MT6323_RG_ISINK_CK_PDN(led->id)); > + if (ret < 0) > + return ret; > + > + return 0; > +} > + > +static int mt6323_get_led_hw_brightness(struct led_classdev *cdev) > +{ > + struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); > + struct mt6323_leds *leds = led->parent; > + struct regmap *regmap = leds->hw->regmap; > + unsigned int status; > + int ret; > + > + ret = regmap_read(regmap, MT6323_TOP_CKPDN2, &status); > + if (ret < 0) > + return ret; > + > + if (status & MT6323_RG_ISINK_CK_PDN_MASK(led->id)) > + return 0; > + > + ret = regmap_read(regmap, MT6323_ISINK_EN_CTRL, &status); > + if (ret < 0) > + return ret; > + > + if (!(status & MT6323_ISINK_CH_EN(led->id))) > + return 0; > + > + ret = regmap_read(regmap, MT6323_ISINK_CON2(led->id), &status); > + if (ret < 0) > + return ret; > + > + return ((status & MT6323_ISINK_CH_STEP_MASK) > + >> MT6323_ISINK_CH_STEP_SHIFT) + 1; > +} > + > +static int mt6323_led_hw_on(struct led_classdev *cdev) > +{ > + struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); > + struct mt6323_leds *leds = led->parent; > + struct regmap *regmap = leds->hw->regmap; > + unsigned int status; > + int ret; > + > + /* > + * Setup required clock source, enable the corresponding > + * clock and channel and let work with continuous blink as > + * the default. > + */ > + ret = regmap_update_bits(regmap, MT6323_TOP_CKCON1, > + MT6323_RG_ISINK_CK_SEL_MASK(led->id), 0); > + if (ret < 0) > + return ret; > + > + status = MT6323_RG_ISINK_CK_PDN(led->id); > + ret = regmap_update_bits(regmap, MT6323_TOP_CKPDN2, > + MT6323_RG_ISINK_CK_PDN_MASK(led->id), > + ~status); > + if (ret < 0) > + return ret; > + > + usleep_range(100, 300); > + > + ret = regmap_update_bits(regmap, MT6323_ISINK_EN_CTRL, > + MT6323_ISINK_CH_EN_MASK(led->id), > + MT6323_ISINK_CH_EN(led->id)); > + if (ret < 0) > + return ret; > + > + ret = regmap_update_bits(regmap, MT6323_ISINK_CON2(led->id), > + MT6323_ISINK_CH_STEP_MASK, > + MT6323_ISINK_CH_STEP(1)); > + if (ret < 0) > + return ret; > + > + ret = regmap_update_bits(regmap, MT6323_ISINK_CON0(led->id), > + MT6323_ISINK_DIM_DUTY_MASK, > + MT6323_ISINK_DIM_DUTY(31)); > + if (ret < 0) > + return ret; > + > + ret = regmap_update_bits(regmap, MT6323_ISINK_CON1(led->id), > + MT6323_ISINK_DIM_FSEL_MASK, > + MT6323_ISINK_DIM_FSEL(1000)); > + if (ret < 0) > + return ret; > + > + led->current_brightness = 1; > + > + return 0; > +} > + > +static int mt6323_led_set_blink(struct led_classdev *cdev, > + unsigned long *delay_on, > + unsigned long *delay_off) > +{ > + struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); > + struct mt6323_leds *leds = led->parent; > + struct regmap *regmap = leds->hw->regmap; > + u16 period; > + u8 duty_cycle, duty_hw; > + int ret; > + > + /* > + * Units are in ms, if over the hardware able > + * to support, fallback into software blink. > + */ > + if (*delay_on + *delay_off > MT6323_MAX_PERIOD) > + return -EINVAL; > + > + /* > + * LED subsystem requires a default user > + * friendly blink pattern for the LED so using > + * 1Hz duty cycle 50% here if without specific > + * value delay_on and delay off being assigned. > + */ > + if (*delay_on == 0 && *delay_off == 0) { > + *delay_on = 500; > + *delay_off = 500; > + } > + > + period = *delay_on + *delay_off; > + > + /* > + * duty_cycle is the percentage of period during > + * which the led is ON. > + */ > + duty_cycle = 100 * (*delay_on) / period; > + > + mutex_lock(&leds->lock); > + > + if (!led->current_brightness) { > + ret = mt6323_led_hw_on(cdev); > + if (ret < 0) > + goto out; > + } > + > + duty_hw = DIV_ROUND_CLOSEST(duty_cycle * 1000, MT6323_UNIT_DUTY); > + ret = regmap_update_bits(regmap, MT6323_ISINK_CON0(led->id), > + MT6323_ISINK_DIM_DUTY_MASK, > + MT6323_ISINK_DIM_DUTY(duty_hw)); > + if (ret < 0) > + goto out; > + > + ret = regmap_update_bits(regmap, MT6323_ISINK_CON1(led->id), > + MT6323_ISINK_DIM_FSEL_MASK, > + MT6323_ISINK_DIM_FSEL(period - 1)); > +out: > + mutex_unlock(&leds->lock); > + > + return ret; > +} > + > +static int mt6323_led_set_brightness(struct led_classdev *cdev, > + enum led_brightness brightness) > +{ > + struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); > + struct mt6323_leds *leds = led->parent; > + struct regmap *regmap = leds->hw->regmap; > + int ret; > + > + mutex_lock(&leds->lock); > + > + if (!led->current_brightness && brightness) { > + ret = mt6323_led_hw_on(cdev); > + if (ret < 0) > + goto out; > + } > + > + if (brightness) { > + /* > + * Setup current output for the corresponding > + * brightness level. > + */ > + ret = regmap_update_bits(regmap, MT6323_ISINK_CON2(led->id), > + MT6323_ISINK_CH_STEP_MASK, > + MT6323_ISINK_CH_STEP(brightness - 1)); > + if (ret < 0) > + goto out; > + > + ret = regmap_update_bits(regmap, MT6323_ISINK_CON2(led->id), > + MT6323_ISINK_SFSTR0_TC_MASK | > + MT6323_ISINK_SFSTR0_EN_MASK, > + MT6323_ISINK_SFSTR0_TC(2) | > + MT6323_ISINK_SFSTR0_EN); > + if (ret < 0) > + goto out; > + } else { > + ret = mt6323_led_hw_off(cdev); > + if (ret < 0) > + goto out; > + } > + > + led->current_brightness = brightness; > +out: > + mutex_unlock(&leds->lock); > + > + return ret; > +} > + > +static int mt6323_led_set_dt_default(struct led_classdev *cdev, > + struct device_node *np) > +{ > + struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); > + const char *state; > + int ret; > + > + led->cdev.name = of_get_property(np, "label", NULL) ? : np->name; > + led->cdev.default_trigger = of_get_property(np, > + "linux,default-trigger", > + NULL); > + > + state = of_get_property(np, "default-state", NULL); > + if (state) { > + if (!strcmp(state, "keep")) { > + ret = mt6323_get_led_hw_brightness(cdev); > + if (ret < 0) > + return ret; > + led->current_brightness = ret; > + } else if (!strcmp(state, "on")) { > + mt6323_led_set_brightness(cdev, 1); > + } else { > + mt6323_led_set_brightness(cdev, 0); > + } > + } > + > + return 0; > +} > + > +static int mt6323_led_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct device_node *np = pdev->dev.of_node; > + struct device_node *child; > + struct mt6397_chip *hw = dev_get_drvdata(pdev->dev.parent); > + struct mt6323_leds *leds; > + int ret, i = 0, count; > + unsigned int status; > + > + count = of_get_child_count(np); > + if (!count) > + return -ENODEV; > + > + count = (count <= MT6323_MAX_LEDS) ? count : MT6323_MAX_LEDS; > + > + leds = devm_kzalloc(dev, sizeof(struct mt6323_leds) + > + sizeof(struct mt6323_led) * count, > + 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); > + leds->led_num = count; > + > + 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) { You're limiting the count of LEDs above, but here you're parsing all available child nodes, which can result in accessing unallocated memory. > + leds->led[i].cdev.max_brightness = MT6323_MAX_BRIGHTNESS; > + leds->led[i].cdev.brightness_set_blocking = > + mt6323_led_set_brightness; > + leds->led[i].cdev.blink_set = mt6323_led_set_blink; > + leds->led[i].id = i; > + leds->led[i].parent = leds; > + > + ret = mt6323_led_set_dt_default(&leds->led[i].cdev, child); > + if (ret < 0) { > + dev_err(leds->dev, > + "Failed to LED set default from devicetree\n"); > + return ret; > + } > + > + ret = devm_led_classdev_register(dev, &leds->led[i].cdev); > + if (ret) { > + dev_err(&pdev->dev, "Failed to register LED: %d\n", > + ret); > + return ret; > + } > + leds->led[i].cdev.dev->of_node = child; > + i++; > + } > + > + return 0; > +} > + > +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 ; i < leds->led_num ; 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"); >
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index c621cbb..30095fc 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -117,6 +117,14 @@ config LEDS_MIKROTIK_RB532 This option enables support for the so called "User LED" of Mikrotik's Routerboard 532. +config LEDS_MT6323 + tristate "LED Support for Mediatek MT6323 PMIC" + depends on LEDS_CLASS + depends on MFD_MT6397 + help + This option enables support for on-chip LED drivers found on + Mediatek MT6323 PMIC. + config LEDS_S3C24XX tristate "LED Support for Samsung S3C24XX GPIO LEDs" depends on LEDS_CLASS diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 6b82737..4feb332 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -72,6 +72,7 @@ obj-$(CONFIG_LEDS_IS31FL32XX) += leds-is31fl32xx.o obj-$(CONFIG_LEDS_PM8058) += leds-pm8058.o obj-$(CONFIG_LEDS_MLXCPLD) += leds-mlxcpld.o obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o +obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o # LED SPI Drivers obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o diff --git a/drivers/leds/leds-mt6323.c b/drivers/leds/leds-mt6323.c new file mode 100644 index 0000000..f431b1d --- /dev/null +++ b/drivers/leds/leds-mt6323.c @@ -0,0 +1,470 @@ +/* + * LED driver for Mediatek MT6323 PMIC + * + * Copyright (C) 2017 Sean Wang <sean.wang@mediatek.com> + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ +#include <linux/kernel.h> +#include <linux/leds.h> +#include <linux/mfd/mt6323/registers.h> +#include <linux/mfd/mt6397/core.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +/* + * Register field for MT6323_TOP_CKPDN0 to enable + * 32K clock common for LED device. + */ +#define MT6323_RG_DRV_32K_CK_PDN BIT(11) +#define MT6323_RG_DRV_32K_CK_PDN_MASK BIT(11) + +/* + * Register field for MT6323_TOP_CKPDN2 to enable + * individual clock for LED device. + */ +#define MT6323_RG_ISINK_CK_PDN(i) BIT(i) +#define MT6323_RG_ISINK_CK_PDN_MASK(i) BIT(i) + +/* + * Register field for MT6323_TOP_CKCON1 to select + * clock source. + */ +#define MT6323_RG_ISINK_CK_SEL_MASK(i) (BIT(10) << (i)) + +/* + * Register for MT6323_ISINK_CON0 to setup the + * duty cycle of the blink. + */ +#define MT6323_ISINK_CON0(i) (MT6323_ISINK0_CON0 + 0x8 * (i)) +#define MT6323_ISINK_DIM_DUTY_MASK (0x1f << 8) +#define MT6323_ISINK_DIM_DUTY(i) (((i) << 8) & \ + MT6323_ISINK_DIM_DUTY_MASK) + +/* Register to setup the period of the blink. */ +#define MT6323_ISINK_CON1(i) (MT6323_ISINK0_CON1 + 0x8 * (i)) +#define MT6323_ISINK_DIM_FSEL_MASK (0xffff) +#define MT6323_ISINK_DIM_FSEL(i) ((i) & MT6323_ISINK_DIM_FSEL_MASK) + +/* Register to control the brightness. */ +#define MT6323_ISINK_CON2(i) (MT6323_ISINK0_CON2 + 0x8 * (i)) +#define MT6323_ISINK_CH_STEP_SHIFT 12 +#define MT6323_ISINK_CH_STEP_MASK (0x7 << 12) +#define MT6323_ISINK_CH_STEP(i) (((i) << 12) & \ + MT6323_ISINK_CH_STEP_MASK) +#define MT6323_ISINK_SFSTR0_TC_MASK (0x3 << 1) +#define MT6323_ISINK_SFSTR0_TC(i) (((i) << 1) & \ + MT6323_ISINK_SFSTR0_TC_MASK) +#define MT6323_ISINK_SFSTR0_EN_MASK BIT(0) +#define MT6323_ISINK_SFSTR0_EN BIT(0) + +/* Register to LED channel enablement. */ +#define MT6323_ISINK_CH_EN_MASK(i) BIT(i) +#define MT6323_ISINK_CH_EN(i) BIT(i) + +#define MT6323_MAX_PERIOD 10000 +#define MT6323_MAX_LEDS 4 +#define MT6323_MAX_BRIGHTNESS 6 +#define MT6323_UNIT_DUTY 3125 + +struct mt6323_leds; + +/** + * struct mt6323_led - state container for the LED device + * @id: the identifier in MT6323 LED device + * @parent: the pointer to MT6323 LED controller + * @cdev: LED class device for this LED device + * @current_brightness: current state of the LED device + */ +struct mt6323_led { + int id; + struct mt6323_leds *parent; + struct led_classdev cdev; + u8 current_brightness; +}; + +/** + * struct mt6323_leds - state container for holding LED controller + * of the driver + * @dev: the device pointer + * @hw: the underlying hardware providing shared + * bus for the register operations + * @led_num: how much the LED device the controller could control + * @lock: the lock among process context + * @led: the array that contains the state of individual + * LED device + */ +struct mt6323_leds { + struct device *dev; + struct mt6397_chip *hw; + u8 led_num; + /* protect among process context */ + struct mutex lock; + struct mt6323_led led[MT6323_MAX_LEDS]; +}; + +static int mt6323_led_hw_off(struct led_classdev *cdev) +{ + struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); + struct mt6323_leds *leds = led->parent; + struct regmap *regmap = leds->hw->regmap; + unsigned int status; + int ret; + + status = MT6323_ISINK_CH_EN(led->id); + ret = regmap_update_bits(regmap, MT6323_ISINK_EN_CTRL, + MT6323_ISINK_CH_EN_MASK(led->id), ~status); + if (ret < 0) + return ret; + + usleep_range(100, 300); + ret = regmap_update_bits(regmap, MT6323_TOP_CKPDN2, + MT6323_RG_ISINK_CK_PDN_MASK(led->id), + MT6323_RG_ISINK_CK_PDN(led->id)); + if (ret < 0) + return ret; + + return 0; +} + +static int mt6323_get_led_hw_brightness(struct led_classdev *cdev) +{ + struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); + struct mt6323_leds *leds = led->parent; + struct regmap *regmap = leds->hw->regmap; + unsigned int status; + int ret; + + ret = regmap_read(regmap, MT6323_TOP_CKPDN2, &status); + if (ret < 0) + return ret; + + if (status & MT6323_RG_ISINK_CK_PDN_MASK(led->id)) + return 0; + + ret = regmap_read(regmap, MT6323_ISINK_EN_CTRL, &status); + if (ret < 0) + return ret; + + if (!(status & MT6323_ISINK_CH_EN(led->id))) + return 0; + + ret = regmap_read(regmap, MT6323_ISINK_CON2(led->id), &status); + if (ret < 0) + return ret; + + return ((status & MT6323_ISINK_CH_STEP_MASK) + >> MT6323_ISINK_CH_STEP_SHIFT) + 1; +} + +static int mt6323_led_hw_on(struct led_classdev *cdev) +{ + struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); + struct mt6323_leds *leds = led->parent; + struct regmap *regmap = leds->hw->regmap; + unsigned int status; + int ret; + + /* + * Setup required clock source, enable the corresponding + * clock and channel and let work with continuous blink as + * the default. + */ + ret = regmap_update_bits(regmap, MT6323_TOP_CKCON1, + MT6323_RG_ISINK_CK_SEL_MASK(led->id), 0); + if (ret < 0) + return ret; + + status = MT6323_RG_ISINK_CK_PDN(led->id); + ret = regmap_update_bits(regmap, MT6323_TOP_CKPDN2, + MT6323_RG_ISINK_CK_PDN_MASK(led->id), + ~status); + if (ret < 0) + return ret; + + usleep_range(100, 300); + + ret = regmap_update_bits(regmap, MT6323_ISINK_EN_CTRL, + MT6323_ISINK_CH_EN_MASK(led->id), + MT6323_ISINK_CH_EN(led->id)); + if (ret < 0) + return ret; + + ret = regmap_update_bits(regmap, MT6323_ISINK_CON2(led->id), + MT6323_ISINK_CH_STEP_MASK, + MT6323_ISINK_CH_STEP(1)); + if (ret < 0) + return ret; + + ret = regmap_update_bits(regmap, MT6323_ISINK_CON0(led->id), + MT6323_ISINK_DIM_DUTY_MASK, + MT6323_ISINK_DIM_DUTY(31)); + if (ret < 0) + return ret; + + ret = regmap_update_bits(regmap, MT6323_ISINK_CON1(led->id), + MT6323_ISINK_DIM_FSEL_MASK, + MT6323_ISINK_DIM_FSEL(1000)); + if (ret < 0) + return ret; + + led->current_brightness = 1; + + return 0; +} + +static int mt6323_led_set_blink(struct led_classdev *cdev, + unsigned long *delay_on, + unsigned long *delay_off) +{ + struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); + struct mt6323_leds *leds = led->parent; + struct regmap *regmap = leds->hw->regmap; + u16 period; + u8 duty_cycle, duty_hw; + int ret; + + /* + * Units are in ms, if over the hardware able + * to support, fallback into software blink. + */ + if (*delay_on + *delay_off > MT6323_MAX_PERIOD) + return -EINVAL; + + /* + * LED subsystem requires a default user + * friendly blink pattern for the LED so using + * 1Hz duty cycle 50% here if without specific + * value delay_on and delay off being assigned. + */ + if (*delay_on == 0 && *delay_off == 0) { + *delay_on = 500; + *delay_off = 500; + } + + period = *delay_on + *delay_off; + + /* + * duty_cycle is the percentage of period during + * which the led is ON. + */ + duty_cycle = 100 * (*delay_on) / period; + + mutex_lock(&leds->lock); + + if (!led->current_brightness) { + ret = mt6323_led_hw_on(cdev); + if (ret < 0) + goto out; + } + + duty_hw = DIV_ROUND_CLOSEST(duty_cycle * 1000, MT6323_UNIT_DUTY); + ret = regmap_update_bits(regmap, MT6323_ISINK_CON0(led->id), + MT6323_ISINK_DIM_DUTY_MASK, + MT6323_ISINK_DIM_DUTY(duty_hw)); + if (ret < 0) + goto out; + + ret = regmap_update_bits(regmap, MT6323_ISINK_CON1(led->id), + MT6323_ISINK_DIM_FSEL_MASK, + MT6323_ISINK_DIM_FSEL(period - 1)); +out: + mutex_unlock(&leds->lock); + + return ret; +} + +static int mt6323_led_set_brightness(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); + struct mt6323_leds *leds = led->parent; + struct regmap *regmap = leds->hw->regmap; + int ret; + + mutex_lock(&leds->lock); + + if (!led->current_brightness && brightness) { + ret = mt6323_led_hw_on(cdev); + if (ret < 0) + goto out; + } + + if (brightness) { + /* + * Setup current output for the corresponding + * brightness level. + */ + ret = regmap_update_bits(regmap, MT6323_ISINK_CON2(led->id), + MT6323_ISINK_CH_STEP_MASK, + MT6323_ISINK_CH_STEP(brightness - 1)); + if (ret < 0) + goto out; + + ret = regmap_update_bits(regmap, MT6323_ISINK_CON2(led->id), + MT6323_ISINK_SFSTR0_TC_MASK | + MT6323_ISINK_SFSTR0_EN_MASK, + MT6323_ISINK_SFSTR0_TC(2) | + MT6323_ISINK_SFSTR0_EN); + if (ret < 0) + goto out; + } else { + ret = mt6323_led_hw_off(cdev); + if (ret < 0) + goto out; + } + + led->current_brightness = brightness; +out: + mutex_unlock(&leds->lock); + + return ret; +} + +static int mt6323_led_set_dt_default(struct led_classdev *cdev, + struct device_node *np) +{ + struct mt6323_led *led = container_of(cdev, struct mt6323_led, cdev); + const char *state; + int ret; + + led->cdev.name = of_get_property(np, "label", NULL) ? : np->name; + led->cdev.default_trigger = of_get_property(np, + "linux,default-trigger", + NULL); + + state = of_get_property(np, "default-state", NULL); + if (state) { + if (!strcmp(state, "keep")) { + ret = mt6323_get_led_hw_brightness(cdev); + if (ret < 0) + return ret; + led->current_brightness = ret; + } else if (!strcmp(state, "on")) { + mt6323_led_set_brightness(cdev, 1); + } else { + mt6323_led_set_brightness(cdev, 0); + } + } + + return 0; +} + +static int mt6323_led_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = pdev->dev.of_node; + struct device_node *child; + struct mt6397_chip *hw = dev_get_drvdata(pdev->dev.parent); + struct mt6323_leds *leds; + int ret, i = 0, count; + unsigned int status; + + count = of_get_child_count(np); + if (!count) + return -ENODEV; + + count = (count <= MT6323_MAX_LEDS) ? count : MT6323_MAX_LEDS; + + leds = devm_kzalloc(dev, sizeof(struct mt6323_leds) + + sizeof(struct mt6323_led) * count, + 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); + leds->led_num = count; + + 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) { + leds->led[i].cdev.max_brightness = MT6323_MAX_BRIGHTNESS; + leds->led[i].cdev.brightness_set_blocking = + mt6323_led_set_brightness; + leds->led[i].cdev.blink_set = mt6323_led_set_blink; + leds->led[i].id = i; + leds->led[i].parent = leds; + + ret = mt6323_led_set_dt_default(&leds->led[i].cdev, child); + if (ret < 0) { + dev_err(leds->dev, + "Failed to LED set default from devicetree\n"); + return ret; + } + + ret = devm_led_classdev_register(dev, &leds->led[i].cdev); + if (ret) { + dev_err(&pdev->dev, "Failed to register LED: %d\n", + ret); + return ret; + } + leds->led[i].cdev.dev->of_node = child; + i++; + } + + return 0; +} + +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 ; i < leds->led_num ; 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");