| Message ID | 1430390110-7194-1-git-send-email-j.anaszewski@samsung.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, Apr 30, 2015 at 3:35 AM, Jacek Anaszewski <j.anaszewski@samsung.com> wrote: > This patch adds led-flash support to Maxim max77693 chipset. > A device can be exposed to user space through LED subsystem > sysfs interface. Device supports up to two leds which can > work in flash and torch mode. The leds can be triggered > externally or by software. > > Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com> > Signed-off-by: Andrzej Hajda <a.hajda@samsung.com> > Acked-by: Kyungmin Park <kyungmin.park@samsung.com> > Cc: Bryan Wu <cooloney@gmail.com> > Cc: Richard Purdie <rpurdie@rpsys.net> Reapplied. thanks. -Bryan > --- > Fixed issues reported by 0-DAY kernel test infrastructure: > > - drivers/leds/leds-max77693.c:978:3-8: No need to set .owner here. The core will do it. > * removed the line > - drivers/leds/leds-max77693.c:193 max77693_add_mode() warn: maybe use && instead of & > * redesigned max77693_add_mode function > > > drivers/leds/Kconfig | 10 + > drivers/leds/Makefile | 1 + > drivers/leds/leds-max77693.c | 980 ++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 991 insertions(+) > create mode 100644 drivers/leds/leds-max77693.c > > diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig > index a38b17a..62be033 100644 > --- a/drivers/leds/Kconfig > +++ b/drivers/leds/Kconfig > @@ -475,6 +475,16 @@ config LEDS_TLC591XX > This option enables support for Texas Instruments TLC59108 > and TLC59116 LED controllers. > > +config LEDS_MAX77693 > + tristate "LED support for MAX77693 Flash" > + depends on LEDS_CLASS_FLASH > + depends on MFD_MAX77693 > + depends on OF > + help > + This option enables support for the flash part of the MAX77693 > + multifunction device. It has build in control for two leds in flash > + and torch mode. > + > config LEDS_MAX8997 > tristate "LED support for MAX8997 PMIC" > depends on LEDS_CLASS && MFD_MAX8997 > diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile > index 749dbe3..8bddae6 100644 > --- a/drivers/leds/Makefile > +++ b/drivers/leds/Makefile > @@ -53,6 +53,7 @@ obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o > obj-$(CONFIG_LEDS_NS2) += leds-ns2.o > obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o > obj-$(CONFIG_LEDS_ASIC3) += leds-asic3.o > +obj-$(CONFIG_LEDS_MAX77693) += leds-max77693.o > obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o > obj-$(CONFIG_LEDS_LM355x) += leds-lm355x.o > obj-$(CONFIG_LEDS_BLINKM) += leds-blinkm.o > diff --git a/drivers/leds/leds-max77693.c b/drivers/leds/leds-max77693.c > new file mode 100644 > index 0000000..eecaa92 > --- /dev/null > +++ b/drivers/leds/leds-max77693.c > @@ -0,0 +1,980 @@ > +/* > + * LED Flash class driver for the flash cell of max77693 mfd. > + * > + * Copyright (C) 2015, Samsung Electronics Co., Ltd. > + * > + * Authors: Jacek Anaszewski <j.anaszewski@samsung.com> > + * Andrzej Hajda <a.hajda@samsung.com> > + * > + * This program is free software; you can redistribute it and/or > + * modify it under the terms of the GNU General Public License > + * version 2 as published by the Free Software Foundation. > + */ > + > +#include <linux/led-class-flash.h> > +#include <linux/mfd/max77693.h> > +#include <linux/mfd/max77693-private.h> > +#include <linux/module.h> > +#include <linux/mutex.h> > +#include <linux/platform_device.h> > +#include <linux/regmap.h> > +#include <linux/slab.h> > +#include <linux/workqueue.h> > + > +#define MODE_OFF 0 > +#define MODE_FLASH(a) (1 << (a)) > +#define MODE_TORCH(a) (1 << (2 + (a))) > +#define MODE_FLASH_EXTERNAL(a) (1 << (4 + (a))) > + > +#define MODE_FLASH_MASK (MODE_FLASH(FLED1) | MODE_FLASH(FLED2) | \ > + MODE_FLASH_EXTERNAL(FLED1) | \ > + MODE_FLASH_EXTERNAL(FLED2)) > +#define MODE_TORCH_MASK (MODE_TORCH(FLED1) | MODE_TORCH(FLED2)) > + > +#define FLED1_IOUT (1 << 0) > +#define FLED2_IOUT (1 << 1) > + > +enum max77693_fled { > + FLED1, > + FLED2, > +}; > + > +enum max77693_led_mode { > + FLASH, > + TORCH, > +}; > + > +struct max77693_led_config_data { > + const char *label[2]; > + u32 iout_torch_max[2]; > + u32 iout_flash_max[2]; > + u32 flash_timeout_max[2]; > + u32 num_leds; > + u32 boost_mode; > + u32 boost_vout; > + u32 low_vsys; > +}; > + > +struct max77693_sub_led { > + /* corresponding FLED output identifier */ > + int fled_id; > + /* corresponding LED Flash class device */ > + struct led_classdev_flash fled_cdev; > + /* assures led-triggers compatibility */ > + struct work_struct work_brightness_set; > + > + /* brightness cache */ > + unsigned int torch_brightness; > + /* flash timeout cache */ > + unsigned int flash_timeout; > + /* flash faults that may have occurred */ > + u32 flash_faults; > +}; > + > +struct max77693_led_device { > + /* parent mfd regmap */ > + struct regmap *regmap; > + /* platform device data */ > + struct platform_device *pdev; > + /* secures access to the device */ > + struct mutex lock; > + > + /* sub led data */ > + struct max77693_sub_led sub_leds[2]; > + > + /* maximum torch current values for FLED outputs */ > + u32 iout_torch_max[2]; > + /* maximum flash current values for FLED outputs */ > + u32 iout_flash_max[2]; > + > + /* current flash timeout cache */ > + unsigned int current_flash_timeout; > + /* ITORCH register cache */ > + u8 torch_iout_reg; > + /* mode of fled outputs */ > + unsigned int mode_flags; > + /* recently strobed fled */ > + int strobing_sub_led_id; > + /* bitmask of FLED outputs use state (bit 0. - FLED1, bit 1. - FLED2) */ > + u8 fled_mask; > + /* FLED modes that can be set */ > + u8 allowed_modes; > + > + /* arrangement of current outputs */ > + bool iout_joint; > +}; > + > +static u8 max77693_led_iout_to_reg(u32 ua) > +{ > + if (ua < FLASH_IOUT_MIN) > + ua = FLASH_IOUT_MIN; > + return (ua - FLASH_IOUT_MIN) / FLASH_IOUT_STEP; > +} > + > +static u8 max77693_flash_timeout_to_reg(u32 us) > +{ > + return (us - FLASH_TIMEOUT_MIN) / FLASH_TIMEOUT_STEP; > +} > + > +static inline struct max77693_sub_led *flcdev_to_sub_led( > + struct led_classdev_flash *fled_cdev) > +{ > + return container_of(fled_cdev, struct max77693_sub_led, fled_cdev); > +} > + > +static inline struct max77693_led_device *sub_led_to_led( > + struct max77693_sub_led *sub_led) > +{ > + return container_of(sub_led, struct max77693_led_device, > + sub_leds[sub_led->fled_id]); > +} > + > +static inline u8 max77693_led_vsys_to_reg(u32 mv) > +{ > + return ((mv - MAX_FLASH1_VSYS_MIN) / MAX_FLASH1_VSYS_STEP) << 2; > +} > + > +static inline u8 max77693_led_vout_to_reg(u32 mv) > +{ > + return (mv - FLASH_VOUT_MIN) / FLASH_VOUT_STEP + FLASH_VOUT_RMIN; > +} > + > +static inline bool max77693_fled_used(struct max77693_led_device *led, > + int fled_id) > +{ > + u8 fled_bit = (fled_id == FLED1) ? FLED1_IOUT : FLED2_IOUT; > + > + return led->fled_mask & fled_bit; > +} > + > +static int max77693_set_mode_reg(struct max77693_led_device *led, u8 mode) > +{ > + struct regmap *rmap = led->regmap; > + int ret, v = 0, i; > + > + for (i = FLED1; i <= FLED2; ++i) { > + if (mode & MODE_TORCH(i)) > + v |= FLASH_EN_ON << TORCH_EN_SHIFT(i); > + > + if (mode & MODE_FLASH(i)) { > + v |= FLASH_EN_ON << FLASH_EN_SHIFT(i); > + } else if (mode & MODE_FLASH_EXTERNAL(i)) { > + v |= FLASH_EN_FLASH << FLASH_EN_SHIFT(i); > + /* > + * Enable hw triggering also for torch mode, as some > + * camera sensors use torch led to fathom ambient light > + * conditions before strobing the flash. > + */ > + v |= FLASH_EN_TORCH << TORCH_EN_SHIFT(i); > + } > + } > + > + /* Reset the register only prior setting flash modes */ > + if (mode & ~(MODE_TORCH(FLED1) | MODE_TORCH(FLED2))) { > + ret = regmap_write(rmap, MAX77693_LED_REG_FLASH_EN, 0); > + if (ret < 0) > + return ret; > + } > + > + return regmap_write(rmap, MAX77693_LED_REG_FLASH_EN, v); > +} > + > +static int max77693_add_mode(struct max77693_led_device *led, u8 mode) > +{ > + u8 new_mode_flags; > + int i, ret; > + > + if (led->iout_joint) > + /* Span the mode on FLED2 for joint iouts case */ > + mode |= (mode << 1); > + > + /* > + * FLASH_EXTERNAL mode activates FLASHEN and TORCHEN pins in the device. > + * Corresponding register bit fields interfere with SW triggered modes, > + * thus clear them to ensure proper device configuration. > + */ > + for (i = FLED1; i <= FLED2; ++i) > + if (mode & MODE_FLASH_EXTERNAL(i)) > + led->mode_flags &= (~MODE_TORCH(i) & ~MODE_FLASH(i)); > + > + new_mode_flags = mode | led->mode_flags; > + new_mode_flags &= led->allowed_modes; > + > + if (new_mode_flags ^ led->mode_flags) > + led->mode_flags = new_mode_flags; > + else > + return 0; > + > + ret = max77693_set_mode_reg(led, led->mode_flags); > + if (ret < 0) > + return ret; > + > + /* > + * Clear flash mode flag after setting the mode to avoid spurious flash > + * strobing on each subsequent torch mode setting. > + */ > + if (mode & MODE_FLASH_MASK) > + led->mode_flags &= ~mode; > + > + return ret; > +} > + > +static int max77693_clear_mode(struct max77693_led_device *led, > + u8 mode) > +{ > + if (led->iout_joint) > + /* Clear mode also on FLED2 for joint iouts case */ > + mode |= (mode << 1); > + > + led->mode_flags &= ~mode; > + > + return max77693_set_mode_reg(led, led->mode_flags); > +} > + > +static void max77693_add_allowed_modes(struct max77693_led_device *led, > + int fled_id, enum max77693_led_mode mode) > +{ > + if (mode == FLASH) > + led->allowed_modes |= (MODE_FLASH(fled_id) | > + MODE_FLASH_EXTERNAL(fled_id)); > + else > + led->allowed_modes |= MODE_TORCH(fled_id); > +} > + > +static void max77693_distribute_currents(struct max77693_led_device *led, > + int fled_id, enum max77693_led_mode mode, > + u32 micro_amp, u32 iout_max[2], u32 iout[2]) > +{ > + if (!led->iout_joint) { > + iout[fled_id] = micro_amp; > + max77693_add_allowed_modes(led, fled_id, mode); > + return; > + } > + > + iout[FLED1] = min(micro_amp, iout_max[FLED1]); > + iout[FLED2] = micro_amp - iout[FLED1]; > + > + if (mode == FLASH) > + led->allowed_modes &= ~MODE_FLASH_MASK; > + else > + led->allowed_modes &= ~MODE_TORCH_MASK; > + > + max77693_add_allowed_modes(led, FLED1, mode); > + > + if (iout[FLED2]) > + max77693_add_allowed_modes(led, FLED2, mode); > +} > + > +static int max77693_set_torch_current(struct max77693_led_device *led, > + int fled_id, u32 micro_amp) > +{ > + struct regmap *rmap = led->regmap; > + u8 iout1_reg = 0, iout2_reg = 0; > + u32 iout[2]; > + > + max77693_distribute_currents(led, fled_id, TORCH, micro_amp, > + led->iout_torch_max, iout); > + > + if (fled_id == FLED1 || led->iout_joint) { > + iout1_reg = max77693_led_iout_to_reg(iout[FLED1]); > + led->torch_iout_reg &= TORCH_IOUT_MASK(TORCH_IOUT2_SHIFT); > + } > + if (fled_id == FLED2 || led->iout_joint) { > + iout2_reg = max77693_led_iout_to_reg(iout[FLED2]); > + led->torch_iout_reg &= TORCH_IOUT_MASK(TORCH_IOUT1_SHIFT); > + } > + > + led->torch_iout_reg |= ((iout1_reg << TORCH_IOUT1_SHIFT) | > + (iout2_reg << TORCH_IOUT2_SHIFT)); > + > + return regmap_write(rmap, MAX77693_LED_REG_ITORCH, > + led->torch_iout_reg); > +} > + > +static int max77693_set_flash_current(struct max77693_led_device *led, > + int fled_id, > + u32 micro_amp) > +{ > + struct regmap *rmap = led->regmap; > + u8 iout1_reg, iout2_reg; > + u32 iout[2]; > + int ret = -EINVAL; > + > + max77693_distribute_currents(led, fled_id, FLASH, micro_amp, > + led->iout_flash_max, iout); > + > + if (fled_id == FLED1 || led->iout_joint) { > + iout1_reg = max77693_led_iout_to_reg(iout[FLED1]); > + ret = regmap_write(rmap, MAX77693_LED_REG_IFLASH1, > + iout1_reg); > + if (ret < 0) > + return ret; > + } > + if (fled_id == FLED2 || led->iout_joint) { > + iout2_reg = max77693_led_iout_to_reg(iout[FLED2]); > + ret = regmap_write(rmap, MAX77693_LED_REG_IFLASH2, > + iout2_reg); > + } > + > + return ret; > +} > + > +static int max77693_set_timeout(struct max77693_led_device *led, u32 microsec) > +{ > + struct regmap *rmap = led->regmap; > + u8 v; > + int ret; > + > + v = max77693_flash_timeout_to_reg(microsec) | FLASH_TMR_LEVEL; > + > + ret = regmap_write(rmap, MAX77693_LED_REG_FLASH_TIMER, v); > + if (ret < 0) > + return ret; > + > + led->current_flash_timeout = microsec; > + > + return 0; > +} > + > +static int max77693_get_strobe_status(struct max77693_led_device *led, > + bool *state) > +{ > + struct regmap *rmap = led->regmap; > + unsigned int v; > + int ret; > + > + ret = regmap_read(rmap, MAX77693_LED_REG_FLASH_STATUS, &v); > + if (ret < 0) > + return ret; > + > + *state = v & FLASH_STATUS_FLASH_ON; > + > + return ret; > +} > + > +static int max77693_get_flash_faults(struct max77693_sub_led *sub_led) > +{ > + struct max77693_led_device *led = sub_led_to_led(sub_led); > + struct regmap *rmap = led->regmap; > + unsigned int v; > + u8 fault_open_mask, fault_short_mask; > + int ret; > + > + sub_led->flash_faults = 0; > + > + if (led->iout_joint) { > + fault_open_mask = FLASH_INT_FLED1_OPEN | FLASH_INT_FLED2_OPEN; > + fault_short_mask = FLASH_INT_FLED1_SHORT | > + FLASH_INT_FLED2_SHORT; > + } else { > + fault_open_mask = (sub_led->fled_id == FLED1) ? > + FLASH_INT_FLED1_OPEN : > + FLASH_INT_FLED2_OPEN; > + fault_short_mask = (sub_led->fled_id == FLED1) ? > + FLASH_INT_FLED1_SHORT : > + FLASH_INT_FLED2_SHORT; > + } > + > + ret = regmap_read(rmap, MAX77693_LED_REG_FLASH_INT, &v); > + if (ret < 0) > + return ret; > + > + if (v & fault_open_mask) > + sub_led->flash_faults |= LED_FAULT_OVER_VOLTAGE; > + if (v & fault_short_mask) > + sub_led->flash_faults |= LED_FAULT_SHORT_CIRCUIT; > + if (v & FLASH_INT_OVER_CURRENT) > + sub_led->flash_faults |= LED_FAULT_OVER_CURRENT; > + > + return 0; > +} > + > +static int max77693_setup(struct max77693_led_device *led, > + struct max77693_led_config_data *led_cfg) > +{ > + struct regmap *rmap = led->regmap; > + int i, first_led, last_led, ret; > + u32 max_flash_curr[2]; > + u8 v; > + > + /* > + * Initialize only flash current. Torch current doesn't > + * require initialization as ITORCH register is written with > + * new value each time brightness_set op is called. > + */ > + if (led->iout_joint) { > + first_led = FLED1; > + last_led = FLED1; > + max_flash_curr[FLED1] = led_cfg->iout_flash_max[FLED1] + > + led_cfg->iout_flash_max[FLED2]; > + } else { > + first_led = max77693_fled_used(led, FLED1) ? FLED1 : FLED2; > + last_led = max77693_fled_used(led, FLED2) ? FLED2 : FLED1; > + max_flash_curr[FLED1] = led_cfg->iout_flash_max[FLED1]; > + max_flash_curr[FLED2] = led_cfg->iout_flash_max[FLED2]; > + } > + > + for (i = first_led; i <= last_led; ++i) { > + ret = max77693_set_flash_current(led, i, > + max_flash_curr[i]); > + if (ret < 0) > + return ret; > + } > + > + v = TORCH_TMR_NO_TIMER | MAX77693_LED_TRIG_TYPE_LEVEL; > + ret = regmap_write(rmap, MAX77693_LED_REG_ITORCHTIMER, v); > + if (ret < 0) > + return ret; > + > + if (led_cfg->low_vsys > 0) > + v = max77693_led_vsys_to_reg(led_cfg->low_vsys) | > + MAX_FLASH1_MAX_FL_EN; > + else > + v = 0; > + > + ret = regmap_write(rmap, MAX77693_LED_REG_MAX_FLASH1, v); > + if (ret < 0) > + return ret; > + ret = regmap_write(rmap, MAX77693_LED_REG_MAX_FLASH2, 0); > + if (ret < 0) > + return ret; > + > + if (led_cfg->boost_mode == MAX77693_LED_BOOST_FIXED) > + v = FLASH_BOOST_FIXED; > + else > + v = led_cfg->boost_mode | led_cfg->boost_mode << 1; > + > + if (max77693_fled_used(led, FLED1) && max77693_fled_used(led, FLED2)) > + v |= FLASH_BOOST_LEDNUM_2; > + > + ret = regmap_write(rmap, MAX77693_LED_REG_VOUT_CNTL, v); > + if (ret < 0) > + return ret; > + > + v = max77693_led_vout_to_reg(led_cfg->boost_vout); > + ret = regmap_write(rmap, MAX77693_LED_REG_VOUT_FLASH1, v); > + if (ret < 0) > + return ret; > + > + return max77693_set_mode_reg(led, MODE_OFF); > +} > + > +static int __max77693_led_brightness_set(struct max77693_led_device *led, > + int fled_id, enum led_brightness value) > +{ > + int ret; > + > + mutex_lock(&led->lock); > + > + if (value == 0) { > + ret = max77693_clear_mode(led, MODE_TORCH(fled_id)); > + if (ret < 0) > + dev_dbg(&led->pdev->dev, > + "Failed to clear torch mode (%d)\n", > + ret); > + goto unlock; > + } > + > + ret = max77693_set_torch_current(led, fled_id, value * TORCH_IOUT_STEP); > + if (ret < 0) { > + dev_dbg(&led->pdev->dev, > + "Failed to set torch current (%d)\n", > + ret); > + goto unlock; > + } > + > + ret = max77693_add_mode(led, MODE_TORCH(fled_id)); > + if (ret < 0) > + dev_dbg(&led->pdev->dev, > + "Failed to set torch mode (%d)\n", > + ret); > +unlock: > + mutex_unlock(&led->lock); > + return ret; > +} > + > +static void max77693_led_brightness_set_work( > + struct work_struct *work) > +{ > + struct max77693_sub_led *sub_led = > + container_of(work, struct max77693_sub_led, > + work_brightness_set); > + struct max77693_led_device *led = sub_led_to_led(sub_led); > + > + __max77693_led_brightness_set(led, sub_led->fled_id, > + sub_led->torch_brightness); > +} > + > +/* LED subsystem callbacks */ > + > +static int max77693_led_brightness_set_sync( > + struct led_classdev *led_cdev, > + enum led_brightness value) > +{ > + struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); > + struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev); > + struct max77693_led_device *led = sub_led_to_led(sub_led); > + > + return __max77693_led_brightness_set(led, sub_led->fled_id, value); > +} > + > +static void max77693_led_brightness_set( > + struct led_classdev *led_cdev, > + enum led_brightness value) > +{ > + struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); > + struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev); > + > + sub_led->torch_brightness = value; > + schedule_work(&sub_led->work_brightness_set); > +} > + > +static int max77693_led_flash_brightness_set( > + struct led_classdev_flash *fled_cdev, > + u32 brightness) > +{ > + struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev); > + struct max77693_led_device *led = sub_led_to_led(sub_led); > + int ret; > + > + mutex_lock(&led->lock); > + ret = max77693_set_flash_current(led, sub_led->fled_id, brightness); > + mutex_unlock(&led->lock); > + > + return ret; > +} > + > +static int max77693_led_flash_strobe_set( > + struct led_classdev_flash *fled_cdev, > + bool state) > +{ > + struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev); > + struct max77693_led_device *led = sub_led_to_led(sub_led); > + int fled_id = sub_led->fled_id; > + int ret; > + > + mutex_lock(&led->lock); > + > + if (!state) { > + ret = max77693_clear_mode(led, MODE_FLASH(fled_id)); > + goto unlock; > + } > + > + if (sub_led->flash_timeout != led->current_flash_timeout) { > + ret = max77693_set_timeout(led, sub_led->flash_timeout); > + if (ret < 0) > + goto unlock; > + } > + > + led->strobing_sub_led_id = fled_id; > + > + ret = max77693_add_mode(led, MODE_FLASH(fled_id)); > + if (ret < 0) > + goto unlock; > + > + ret = max77693_get_flash_faults(sub_led); > + > +unlock: > + mutex_unlock(&led->lock); > + return ret; > +} > + > +static int max77693_led_flash_fault_get( > + struct led_classdev_flash *fled_cdev, > + u32 *fault) > +{ > + struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev); > + > + *fault = sub_led->flash_faults; > + > + return 0; > +} > + > +static int max77693_led_flash_strobe_get( > + struct led_classdev_flash *fled_cdev, > + bool *state) > +{ > + struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev); > + struct max77693_led_device *led = sub_led_to_led(sub_led); > + int ret; > + > + if (!state) > + return -EINVAL; > + > + mutex_lock(&led->lock); > + > + ret = max77693_get_strobe_status(led, state); > + > + *state = !!(*state && (led->strobing_sub_led_id == sub_led->fled_id)); > + > + mutex_unlock(&led->lock); > + > + return ret; > +} > + > +static int max77693_led_flash_timeout_set( > + struct led_classdev_flash *fled_cdev, > + u32 timeout) > +{ > + struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev); > + struct max77693_led_device *led = sub_led_to_led(sub_led); > + > + mutex_lock(&led->lock); > + sub_led->flash_timeout = timeout; > + mutex_unlock(&led->lock); > + > + return 0; > +} > + > +static int max77693_led_parse_dt(struct max77693_led_device *led, > + struct max77693_led_config_data *cfg) > +{ > + struct device *dev = &led->pdev->dev; > + struct max77693_sub_led *sub_leds = led->sub_leds; > + struct device_node *node = dev->of_node, *child_node; > + struct property *prop; > + u32 led_sources[2]; > + int i, ret, fled_id; > + > + of_property_read_u32(node, "maxim,boost-mode", &cfg->boost_mode); > + of_property_read_u32(node, "maxim,boost-mvout", &cfg->boost_vout); > + of_property_read_u32(node, "maxim,mvsys-min", &cfg->low_vsys); > + > + for_each_available_child_of_node(node, child_node) { > + prop = of_find_property(child_node, "led-sources", NULL); > + if (prop) { > + const __be32 *srcs = NULL; > + > + for (i = 0; i < ARRAY_SIZE(led_sources); ++i) { > + srcs = of_prop_next_u32(prop, srcs, > + &led_sources[i]); > + if (!srcs) > + break; > + } > + } else { > + dev_err(dev, > + "led-sources DT property missing\n"); > + of_node_put(child_node); > + return -EINVAL; > + } > + > + if (i == 2) { > + fled_id = FLED1; > + led->fled_mask = FLED1_IOUT | FLED2_IOUT; > + } else if (led_sources[0] == FLED1) { > + fled_id = FLED1; > + led->fled_mask |= FLED1_IOUT; > + } else if (led_sources[0] == FLED2) { > + fled_id = FLED2; > + led->fled_mask |= FLED2_IOUT; > + } else { > + dev_err(dev, > + "Wrong led-sources DT property value.\n"); > + of_node_put(child_node); > + return -EINVAL; > + } > + > + sub_leds[fled_id].fled_id = fled_id; > + > + cfg->label[fled_id] = > + of_get_property(child_node, "label", NULL) ? : > + child_node->name; > + > + ret = of_property_read_u32(child_node, "led-max-microamp", > + &cfg->iout_torch_max[fled_id]); > + if (ret < 0) { > + cfg->iout_torch_max[fled_id] = TORCH_IOUT_MIN; > + dev_warn(dev, "led-max-microamp DT property missing\n"); > + } > + > + ret = of_property_read_u32(child_node, "flash-max-microamp", > + &cfg->iout_flash_max[fled_id]); > + if (ret < 0) { > + cfg->iout_flash_max[fled_id] = FLASH_IOUT_MIN; > + dev_warn(dev, > + "flash-max-microamp DT property missing\n"); > + } > + > + ret = of_property_read_u32(child_node, "flash-max-timeout-us", > + &cfg->flash_timeout_max[fled_id]); > + if (ret < 0) { > + cfg->flash_timeout_max[fled_id] = FLASH_TIMEOUT_MIN; > + dev_warn(dev, > + "flash-max-timeout-us DT property missing\n"); > + } > + > + if (++cfg->num_leds == 2 || > + (max77693_fled_used(led, FLED1) && > + max77693_fled_used(led, FLED2))) { > + of_node_put(child_node); > + break; > + } > + } > + > + if (cfg->num_leds == 0) { > + dev_err(dev, "No DT child node found for connected LED(s).\n"); > + return -EINVAL; > + } > + > + return 0; > +} > + > +static void clamp_align(u32 *v, u32 min, u32 max, u32 step) > +{ > + *v = clamp_val(*v, min, max); > + if (step > 1) > + *v = (*v - min) / step * step + min; > +} > + > +static void max77693_align_iout_current(struct max77693_led_device *led, > + u32 *iout, u32 min, u32 max, u32 step) > +{ > + int i; > + > + if (led->iout_joint) { > + if (iout[FLED1] > min) { > + iout[FLED1] /= 2; > + iout[FLED2] = iout[FLED1]; > + } else { > + iout[FLED1] = min; > + iout[FLED2] = 0; > + return; > + } > + } > + > + for (i = FLED1; i <= FLED2; ++i) > + if (max77693_fled_used(led, i)) > + clamp_align(&iout[i], min, max, step); > + else > + iout[i] = 0; > +} > + > +static void max77693_led_validate_configuration(struct max77693_led_device *led, > + struct max77693_led_config_data *cfg) > +{ > + u32 flash_iout_max = cfg->boost_mode ? FLASH_IOUT_MAX_2LEDS : > + FLASH_IOUT_MAX_1LED; > + int i; > + > + if (cfg->num_leds == 1 && > + max77693_fled_used(led, FLED1) && max77693_fled_used(led, FLED2)) > + led->iout_joint = true; > + > + cfg->boost_mode = clamp_val(cfg->boost_mode, MAX77693_LED_BOOST_NONE, > + MAX77693_LED_BOOST_FIXED); > + > + /* Boost must be enabled if both current outputs are used */ > + if ((cfg->boost_mode == MAX77693_LED_BOOST_NONE) && led->iout_joint) > + cfg->boost_mode = MAX77693_LED_BOOST_FIXED; > + > + max77693_align_iout_current(led, cfg->iout_torch_max, > + TORCH_IOUT_MIN, TORCH_IOUT_MAX, TORCH_IOUT_STEP); > + > + max77693_align_iout_current(led, cfg->iout_flash_max, > + FLASH_IOUT_MIN, flash_iout_max, FLASH_IOUT_STEP); > + > + for (i = 0; i < ARRAY_SIZE(cfg->flash_timeout_max); ++i) > + clamp_align(&cfg->flash_timeout_max[i], FLASH_TIMEOUT_MIN, > + FLASH_TIMEOUT_MAX, FLASH_TIMEOUT_STEP); > + > + clamp_align(&cfg->boost_vout, FLASH_VOUT_MIN, FLASH_VOUT_MAX, > + FLASH_VOUT_STEP); > + > + if (cfg->low_vsys) > + clamp_align(&cfg->low_vsys, MAX_FLASH1_VSYS_MIN, > + MAX_FLASH1_VSYS_MAX, MAX_FLASH1_VSYS_STEP); > +} > + > +static int max77693_led_get_configuration(struct max77693_led_device *led, > + struct max77693_led_config_data *cfg) > +{ > + int ret; > + > + ret = max77693_led_parse_dt(led, cfg); > + if (ret < 0) > + return ret; > + > + max77693_led_validate_configuration(led, cfg); > + > + memcpy(led->iout_torch_max, cfg->iout_torch_max, > + sizeof(led->iout_torch_max)); > + memcpy(led->iout_flash_max, cfg->iout_flash_max, > + sizeof(led->iout_flash_max)); > + > + return 0; > +} > + > +static const struct led_flash_ops flash_ops = { > + .flash_brightness_set = max77693_led_flash_brightness_set, > + .strobe_set = max77693_led_flash_strobe_set, > + .strobe_get = max77693_led_flash_strobe_get, > + .timeout_set = max77693_led_flash_timeout_set, > + .fault_get = max77693_led_flash_fault_get, > +}; > + > +static void max77693_init_flash_settings(struct max77693_sub_led *sub_led, > + struct max77693_led_config_data *led_cfg) > +{ > + struct led_classdev_flash *fled_cdev = &sub_led->fled_cdev; > + struct max77693_led_device *led = sub_led_to_led(sub_led); > + int fled_id = sub_led->fled_id; > + struct led_flash_setting *setting; > + > + /* Init flash intensity setting */ > + setting = &fled_cdev->brightness; > + setting->min = FLASH_IOUT_MIN; > + setting->max = led->iout_joint ? > + led_cfg->iout_flash_max[FLED1] + > + led_cfg->iout_flash_max[FLED2] : > + led_cfg->iout_flash_max[fled_id]; > + setting->step = FLASH_IOUT_STEP; > + setting->val = setting->max; > + > + /* Init flash timeout setting */ > + setting = &fled_cdev->timeout; > + setting->min = FLASH_TIMEOUT_MIN; > + setting->max = led_cfg->flash_timeout_max[fled_id]; > + setting->step = FLASH_TIMEOUT_STEP; > + setting->val = setting->max; > +} > + > +static void max77693_init_fled_cdev(struct max77693_sub_led *sub_led, > + struct max77693_led_config_data *led_cfg) > +{ > + struct max77693_led_device *led = sub_led_to_led(sub_led); > + int fled_id = sub_led->fled_id; > + struct led_classdev_flash *fled_cdev; > + struct led_classdev *led_cdev; > + > + /* Initialize LED Flash class device */ > + fled_cdev = &sub_led->fled_cdev; > + fled_cdev->ops = &flash_ops; > + led_cdev = &fled_cdev->led_cdev; > + > + led_cdev->name = led_cfg->label[fled_id]; > + > + led_cdev->brightness_set = max77693_led_brightness_set; > + led_cdev->brightness_set_sync = max77693_led_brightness_set_sync; > + led_cdev->max_brightness = (led->iout_joint ? > + led_cfg->iout_torch_max[FLED1] + > + led_cfg->iout_torch_max[FLED2] : > + led_cfg->iout_torch_max[fled_id]) / > + TORCH_IOUT_STEP; > + led_cdev->flags |= LED_DEV_CAP_FLASH; > + INIT_WORK(&sub_led->work_brightness_set, > + max77693_led_brightness_set_work); > + > + max77693_init_flash_settings(sub_led, led_cfg); > + > + /* Init flash timeout cache */ > + sub_led->flash_timeout = fled_cdev->timeout.val; > +} > + > +static int max77693_led_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct max77693_dev *iodev = dev_get_drvdata(dev->parent); > + struct max77693_led_device *led; > + struct max77693_sub_led *sub_leds; > + struct max77693_led_config_data led_cfg = {}; > + int init_fled_cdev[2], i, ret; > + > + led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL); > + if (!led) > + return -ENOMEM; > + > + led->pdev = pdev; > + led->regmap = iodev->regmap; > + led->allowed_modes = MODE_FLASH_MASK; > + sub_leds = led->sub_leds; > + > + platform_set_drvdata(pdev, led); > + ret = max77693_led_get_configuration(led, &led_cfg); > + if (ret < 0) > + return ret; > + > + ret = max77693_setup(led, &led_cfg); > + if (ret < 0) > + return ret; > + > + mutex_init(&led->lock); > + > + init_fled_cdev[FLED1] = > + led->iout_joint || max77693_fled_used(led, FLED1); > + init_fled_cdev[FLED2] = > + !led->iout_joint && max77693_fled_used(led, FLED2); > + > + for (i = FLED1; i <= FLED2; ++i) { > + if (!init_fled_cdev[i]) > + continue; > + > + /* Initialize LED Flash class device */ > + max77693_init_fled_cdev(&sub_leds[i], &led_cfg); > + > + /* Register LED Flash class device */ > + ret = led_classdev_flash_register(dev, &sub_leds[i].fled_cdev); > + if (ret < 0) { > + /* > + * At this moment FLED1 might have been already > + * registered and it needs to be released. > + */ > + if (i == FLED2) > + goto err_register_led2; > + else > + goto err_register_led1; > + } > + } > + > + return 0; > + > +err_register_led2: > + /* It is possible than only FLED2 was to be registered */ > + if (!init_fled_cdev[FLED1]) > + goto err_register_led1; > + led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev); > +err_register_led1: > + mutex_destroy(&led->lock); > + > + return ret; > +} > + > +static int max77693_led_remove(struct platform_device *pdev) > +{ > + struct max77693_led_device *led = platform_get_drvdata(pdev); > + struct max77693_sub_led *sub_leds = led->sub_leds; > + > + if (led->iout_joint || max77693_fled_used(led, FLED1)) { > + led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev); > + cancel_work_sync(&sub_leds[FLED1].work_brightness_set); > + } > + > + if (!led->iout_joint && max77693_fled_used(led, FLED2)) { > + led_classdev_flash_unregister(&sub_leds[FLED2].fled_cdev); > + cancel_work_sync(&sub_leds[FLED2].work_brightness_set); > + } > + > + mutex_destroy(&led->lock); > + > + return 0; > +} > + > +static const struct of_device_id max77693_led_dt_match[] = { > + { .compatible = "maxim,max77693-led" }, > + {}, > +}; > + > +static struct platform_driver max77693_led_driver = { > + .probe = max77693_led_probe, > + .remove = max77693_led_remove, > + .driver = { > + .name = "max77693-led", > + .of_match_table = max77693_led_dt_match, > + }, > +}; > + > +module_platform_driver(max77693_led_driver); > + > +MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@samsung.com>"); > +MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>"); > +MODULE_DESCRIPTION("Maxim MAX77693 led flash driver"); > +MODULE_LICENSE("GPL v2"); > -- > 1.7.9.5 > -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index a38b17a..62be033 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -475,6 +475,16 @@ config LEDS_TLC591XX This option enables support for Texas Instruments TLC59108 and TLC59116 LED controllers. +config LEDS_MAX77693 + tristate "LED support for MAX77693 Flash" + depends on LEDS_CLASS_FLASH + depends on MFD_MAX77693 + depends on OF + help + This option enables support for the flash part of the MAX77693 + multifunction device. It has build in control for two leds in flash + and torch mode. + config LEDS_MAX8997 tristate "LED support for MAX8997 PMIC" depends on LEDS_CLASS && MFD_MAX8997 diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 749dbe3..8bddae6 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -53,6 +53,7 @@ obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o obj-$(CONFIG_LEDS_NS2) += leds-ns2.o obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o obj-$(CONFIG_LEDS_ASIC3) += leds-asic3.o +obj-$(CONFIG_LEDS_MAX77693) += leds-max77693.o obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o obj-$(CONFIG_LEDS_LM355x) += leds-lm355x.o obj-$(CONFIG_LEDS_BLINKM) += leds-blinkm.o diff --git a/drivers/leds/leds-max77693.c b/drivers/leds/leds-max77693.c new file mode 100644 index 0000000..eecaa92 --- /dev/null +++ b/drivers/leds/leds-max77693.c @@ -0,0 +1,980 @@ +/* + * LED Flash class driver for the flash cell of max77693 mfd. + * + * Copyright (C) 2015, Samsung Electronics Co., Ltd. + * + * Authors: Jacek Anaszewski <j.anaszewski@samsung.com> + * Andrzej Hajda <a.hajda@samsung.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + */ + +#include <linux/led-class-flash.h> +#include <linux/mfd/max77693.h> +#include <linux/mfd/max77693-private.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/slab.h> +#include <linux/workqueue.h> + +#define MODE_OFF 0 +#define MODE_FLASH(a) (1 << (a)) +#define MODE_TORCH(a) (1 << (2 + (a))) +#define MODE_FLASH_EXTERNAL(a) (1 << (4 + (a))) + +#define MODE_FLASH_MASK (MODE_FLASH(FLED1) | MODE_FLASH(FLED2) | \ + MODE_FLASH_EXTERNAL(FLED1) | \ + MODE_FLASH_EXTERNAL(FLED2)) +#define MODE_TORCH_MASK (MODE_TORCH(FLED1) | MODE_TORCH(FLED2)) + +#define FLED1_IOUT (1 << 0) +#define FLED2_IOUT (1 << 1) + +enum max77693_fled { + FLED1, + FLED2, +}; + +enum max77693_led_mode { + FLASH, + TORCH, +}; + +struct max77693_led_config_data { + const char *label[2]; + u32 iout_torch_max[2]; + u32 iout_flash_max[2]; + u32 flash_timeout_max[2]; + u32 num_leds; + u32 boost_mode; + u32 boost_vout; + u32 low_vsys; +}; + +struct max77693_sub_led { + /* corresponding FLED output identifier */ + int fled_id; + /* corresponding LED Flash class device */ + struct led_classdev_flash fled_cdev; + /* assures led-triggers compatibility */ + struct work_struct work_brightness_set; + + /* brightness cache */ + unsigned int torch_brightness; + /* flash timeout cache */ + unsigned int flash_timeout; + /* flash faults that may have occurred */ + u32 flash_faults; +}; + +struct max77693_led_device { + /* parent mfd regmap */ + struct regmap *regmap; + /* platform device data */ + struct platform_device *pdev; + /* secures access to the device */ + struct mutex lock; + + /* sub led data */ + struct max77693_sub_led sub_leds[2]; + + /* maximum torch current values for FLED outputs */ + u32 iout_torch_max[2]; + /* maximum flash current values for FLED outputs */ + u32 iout_flash_max[2]; + + /* current flash timeout cache */ + unsigned int current_flash_timeout; + /* ITORCH register cache */ + u8 torch_iout_reg; + /* mode of fled outputs */ + unsigned int mode_flags; + /* recently strobed fled */ + int strobing_sub_led_id; + /* bitmask of FLED outputs use state (bit 0. - FLED1, bit 1. - FLED2) */ + u8 fled_mask; + /* FLED modes that can be set */ + u8 allowed_modes; + + /* arrangement of current outputs */ + bool iout_joint; +}; + +static u8 max77693_led_iout_to_reg(u32 ua) +{ + if (ua < FLASH_IOUT_MIN) + ua = FLASH_IOUT_MIN; + return (ua - FLASH_IOUT_MIN) / FLASH_IOUT_STEP; +} + +static u8 max77693_flash_timeout_to_reg(u32 us) +{ + return (us - FLASH_TIMEOUT_MIN) / FLASH_TIMEOUT_STEP; +} + +static inline struct max77693_sub_led *flcdev_to_sub_led( + struct led_classdev_flash *fled_cdev) +{ + return container_of(fled_cdev, struct max77693_sub_led, fled_cdev); +} + +static inline struct max77693_led_device *sub_led_to_led( + struct max77693_sub_led *sub_led) +{ + return container_of(sub_led, struct max77693_led_device, + sub_leds[sub_led->fled_id]); +} + +static inline u8 max77693_led_vsys_to_reg(u32 mv) +{ + return ((mv - MAX_FLASH1_VSYS_MIN) / MAX_FLASH1_VSYS_STEP) << 2; +} + +static inline u8 max77693_led_vout_to_reg(u32 mv) +{ + return (mv - FLASH_VOUT_MIN) / FLASH_VOUT_STEP + FLASH_VOUT_RMIN; +} + +static inline bool max77693_fled_used(struct max77693_led_device *led, + int fled_id) +{ + u8 fled_bit = (fled_id == FLED1) ? FLED1_IOUT : FLED2_IOUT; + + return led->fled_mask & fled_bit; +} + +static int max77693_set_mode_reg(struct max77693_led_device *led, u8 mode) +{ + struct regmap *rmap = led->regmap; + int ret, v = 0, i; + + for (i = FLED1; i <= FLED2; ++i) { + if (mode & MODE_TORCH(i)) + v |= FLASH_EN_ON << TORCH_EN_SHIFT(i); + + if (mode & MODE_FLASH(i)) { + v |= FLASH_EN_ON << FLASH_EN_SHIFT(i); + } else if (mode & MODE_FLASH_EXTERNAL(i)) { + v |= FLASH_EN_FLASH << FLASH_EN_SHIFT(i); + /* + * Enable hw triggering also for torch mode, as some + * camera sensors use torch led to fathom ambient light + * conditions before strobing the flash. + */ + v |= FLASH_EN_TORCH << TORCH_EN_SHIFT(i); + } + } + + /* Reset the register only prior setting flash modes */ + if (mode & ~(MODE_TORCH(FLED1) | MODE_TORCH(FLED2))) { + ret = regmap_write(rmap, MAX77693_LED_REG_FLASH_EN, 0); + if (ret < 0) + return ret; + } + + return regmap_write(rmap, MAX77693_LED_REG_FLASH_EN, v); +} + +static int max77693_add_mode(struct max77693_led_device *led, u8 mode) +{ + u8 new_mode_flags; + int i, ret; + + if (led->iout_joint) + /* Span the mode on FLED2 for joint iouts case */ + mode |= (mode << 1); + + /* + * FLASH_EXTERNAL mode activates FLASHEN and TORCHEN pins in the device. + * Corresponding register bit fields interfere with SW triggered modes, + * thus clear them to ensure proper device configuration. + */ + for (i = FLED1; i <= FLED2; ++i) + if (mode & MODE_FLASH_EXTERNAL(i)) + led->mode_flags &= (~MODE_TORCH(i) & ~MODE_FLASH(i)); + + new_mode_flags = mode | led->mode_flags; + new_mode_flags &= led->allowed_modes; + + if (new_mode_flags ^ led->mode_flags) + led->mode_flags = new_mode_flags; + else + return 0; + + ret = max77693_set_mode_reg(led, led->mode_flags); + if (ret < 0) + return ret; + + /* + * Clear flash mode flag after setting the mode to avoid spurious flash + * strobing on each subsequent torch mode setting. + */ + if (mode & MODE_FLASH_MASK) + led->mode_flags &= ~mode; + + return ret; +} + +static int max77693_clear_mode(struct max77693_led_device *led, + u8 mode) +{ + if (led->iout_joint) + /* Clear mode also on FLED2 for joint iouts case */ + mode |= (mode << 1); + + led->mode_flags &= ~mode; + + return max77693_set_mode_reg(led, led->mode_flags); +} + +static void max77693_add_allowed_modes(struct max77693_led_device *led, + int fled_id, enum max77693_led_mode mode) +{ + if (mode == FLASH) + led->allowed_modes |= (MODE_FLASH(fled_id) | + MODE_FLASH_EXTERNAL(fled_id)); + else + led->allowed_modes |= MODE_TORCH(fled_id); +} + +static void max77693_distribute_currents(struct max77693_led_device *led, + int fled_id, enum max77693_led_mode mode, + u32 micro_amp, u32 iout_max[2], u32 iout[2]) +{ + if (!led->iout_joint) { + iout[fled_id] = micro_amp; + max77693_add_allowed_modes(led, fled_id, mode); + return; + } + + iout[FLED1] = min(micro_amp, iout_max[FLED1]); + iout[FLED2] = micro_amp - iout[FLED1]; + + if (mode == FLASH) + led->allowed_modes &= ~MODE_FLASH_MASK; + else + led->allowed_modes &= ~MODE_TORCH_MASK; + + max77693_add_allowed_modes(led, FLED1, mode); + + if (iout[FLED2]) + max77693_add_allowed_modes(led, FLED2, mode); +} + +static int max77693_set_torch_current(struct max77693_led_device *led, + int fled_id, u32 micro_amp) +{ + struct regmap *rmap = led->regmap; + u8 iout1_reg = 0, iout2_reg = 0; + u32 iout[2]; + + max77693_distribute_currents(led, fled_id, TORCH, micro_amp, + led->iout_torch_max, iout); + + if (fled_id == FLED1 || led->iout_joint) { + iout1_reg = max77693_led_iout_to_reg(iout[FLED1]); + led->torch_iout_reg &= TORCH_IOUT_MASK(TORCH_IOUT2_SHIFT); + } + if (fled_id == FLED2 || led->iout_joint) { + iout2_reg = max77693_led_iout_to_reg(iout[FLED2]); + led->torch_iout_reg &= TORCH_IOUT_MASK(TORCH_IOUT1_SHIFT); + } + + led->torch_iout_reg |= ((iout1_reg << TORCH_IOUT1_SHIFT) | + (iout2_reg << TORCH_IOUT2_SHIFT)); + + return regmap_write(rmap, MAX77693_LED_REG_ITORCH, + led->torch_iout_reg); +} + +static int max77693_set_flash_current(struct max77693_led_device *led, + int fled_id, + u32 micro_amp) +{ + struct regmap *rmap = led->regmap; + u8 iout1_reg, iout2_reg; + u32 iout[2]; + int ret = -EINVAL; + + max77693_distribute_currents(led, fled_id, FLASH, micro_amp, + led->iout_flash_max, iout); + + if (fled_id == FLED1 || led->iout_joint) { + iout1_reg = max77693_led_iout_to_reg(iout[FLED1]); + ret = regmap_write(rmap, MAX77693_LED_REG_IFLASH1, + iout1_reg); + if (ret < 0) + return ret; + } + if (fled_id == FLED2 || led->iout_joint) { + iout2_reg = max77693_led_iout_to_reg(iout[FLED2]); + ret = regmap_write(rmap, MAX77693_LED_REG_IFLASH2, + iout2_reg); + } + + return ret; +} + +static int max77693_set_timeout(struct max77693_led_device *led, u32 microsec) +{ + struct regmap *rmap = led->regmap; + u8 v; + int ret; + + v = max77693_flash_timeout_to_reg(microsec) | FLASH_TMR_LEVEL; + + ret = regmap_write(rmap, MAX77693_LED_REG_FLASH_TIMER, v); + if (ret < 0) + return ret; + + led->current_flash_timeout = microsec; + + return 0; +} + +static int max77693_get_strobe_status(struct max77693_led_device *led, + bool *state) +{ + struct regmap *rmap = led->regmap; + unsigned int v; + int ret; + + ret = regmap_read(rmap, MAX77693_LED_REG_FLASH_STATUS, &v); + if (ret < 0) + return ret; + + *state = v & FLASH_STATUS_FLASH_ON; + + return ret; +} + +static int max77693_get_flash_faults(struct max77693_sub_led *sub_led) +{ + struct max77693_led_device *led = sub_led_to_led(sub_led); + struct regmap *rmap = led->regmap; + unsigned int v; + u8 fault_open_mask, fault_short_mask; + int ret; + + sub_led->flash_faults = 0; + + if (led->iout_joint) { + fault_open_mask = FLASH_INT_FLED1_OPEN | FLASH_INT_FLED2_OPEN; + fault_short_mask = FLASH_INT_FLED1_SHORT | + FLASH_INT_FLED2_SHORT; + } else { + fault_open_mask = (sub_led->fled_id == FLED1) ? + FLASH_INT_FLED1_OPEN : + FLASH_INT_FLED2_OPEN; + fault_short_mask = (sub_led->fled_id == FLED1) ? + FLASH_INT_FLED1_SHORT : + FLASH_INT_FLED2_SHORT; + } + + ret = regmap_read(rmap, MAX77693_LED_REG_FLASH_INT, &v); + if (ret < 0) + return ret; + + if (v & fault_open_mask) + sub_led->flash_faults |= LED_FAULT_OVER_VOLTAGE; + if (v & fault_short_mask) + sub_led->flash_faults |= LED_FAULT_SHORT_CIRCUIT; + if (v & FLASH_INT_OVER_CURRENT) + sub_led->flash_faults |= LED_FAULT_OVER_CURRENT; + + return 0; +} + +static int max77693_setup(struct max77693_led_device *led, + struct max77693_led_config_data *led_cfg) +{ + struct regmap *rmap = led->regmap; + int i, first_led, last_led, ret; + u32 max_flash_curr[2]; + u8 v; + + /* + * Initialize only flash current. Torch current doesn't + * require initialization as ITORCH register is written with + * new value each time brightness_set op is called. + */ + if (led->iout_joint) { + first_led = FLED1; + last_led = FLED1; + max_flash_curr[FLED1] = led_cfg->iout_flash_max[FLED1] + + led_cfg->iout_flash_max[FLED2]; + } else { + first_led = max77693_fled_used(led, FLED1) ? FLED1 : FLED2; + last_led = max77693_fled_used(led, FLED2) ? FLED2 : FLED1; + max_flash_curr[FLED1] = led_cfg->iout_flash_max[FLED1]; + max_flash_curr[FLED2] = led_cfg->iout_flash_max[FLED2]; + } + + for (i = first_led; i <= last_led; ++i) { + ret = max77693_set_flash_current(led, i, + max_flash_curr[i]); + if (ret < 0) + return ret; + } + + v = TORCH_TMR_NO_TIMER | MAX77693_LED_TRIG_TYPE_LEVEL; + ret = regmap_write(rmap, MAX77693_LED_REG_ITORCHTIMER, v); + if (ret < 0) + return ret; + + if (led_cfg->low_vsys > 0) + v = max77693_led_vsys_to_reg(led_cfg->low_vsys) | + MAX_FLASH1_MAX_FL_EN; + else + v = 0; + + ret = regmap_write(rmap, MAX77693_LED_REG_MAX_FLASH1, v); + if (ret < 0) + return ret; + ret = regmap_write(rmap, MAX77693_LED_REG_MAX_FLASH2, 0); + if (ret < 0) + return ret; + + if (led_cfg->boost_mode == MAX77693_LED_BOOST_FIXED) + v = FLASH_BOOST_FIXED; + else + v = led_cfg->boost_mode | led_cfg->boost_mode << 1; + + if (max77693_fled_used(led, FLED1) && max77693_fled_used(led, FLED2)) + v |= FLASH_BOOST_LEDNUM_2; + + ret = regmap_write(rmap, MAX77693_LED_REG_VOUT_CNTL, v); + if (ret < 0) + return ret; + + v = max77693_led_vout_to_reg(led_cfg->boost_vout); + ret = regmap_write(rmap, MAX77693_LED_REG_VOUT_FLASH1, v); + if (ret < 0) + return ret; + + return max77693_set_mode_reg(led, MODE_OFF); +} + +static int __max77693_led_brightness_set(struct max77693_led_device *led, + int fled_id, enum led_brightness value) +{ + int ret; + + mutex_lock(&led->lock); + + if (value == 0) { + ret = max77693_clear_mode(led, MODE_TORCH(fled_id)); + if (ret < 0) + dev_dbg(&led->pdev->dev, + "Failed to clear torch mode (%d)\n", + ret); + goto unlock; + } + + ret = max77693_set_torch_current(led, fled_id, value * TORCH_IOUT_STEP); + if (ret < 0) { + dev_dbg(&led->pdev->dev, + "Failed to set torch current (%d)\n", + ret); + goto unlock; + } + + ret = max77693_add_mode(led, MODE_TORCH(fled_id)); + if (ret < 0) + dev_dbg(&led->pdev->dev, + "Failed to set torch mode (%d)\n", + ret); +unlock: + mutex_unlock(&led->lock); + return ret; +} + +static void max77693_led_brightness_set_work( + struct work_struct *work) +{ + struct max77693_sub_led *sub_led = + container_of(work, struct max77693_sub_led, + work_brightness_set); + struct max77693_led_device *led = sub_led_to_led(sub_led); + + __max77693_led_brightness_set(led, sub_led->fled_id, + sub_led->torch_brightness); +} + +/* LED subsystem callbacks */ + +static int max77693_led_brightness_set_sync( + struct led_classdev *led_cdev, + enum led_brightness value) +{ + struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); + struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev); + struct max77693_led_device *led = sub_led_to_led(sub_led); + + return __max77693_led_brightness_set(led, sub_led->fled_id, value); +} + +static void max77693_led_brightness_set( + struct led_classdev *led_cdev, + enum led_brightness value) +{ + struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); + struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev); + + sub_led->torch_brightness = value; + schedule_work(&sub_led->work_brightness_set); +} + +static int max77693_led_flash_brightness_set( + struct led_classdev_flash *fled_cdev, + u32 brightness) +{ + struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev); + struct max77693_led_device *led = sub_led_to_led(sub_led); + int ret; + + mutex_lock(&led->lock); + ret = max77693_set_flash_current(led, sub_led->fled_id, brightness); + mutex_unlock(&led->lock); + + return ret; +} + +static int max77693_led_flash_strobe_set( + struct led_classdev_flash *fled_cdev, + bool state) +{ + struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev); + struct max77693_led_device *led = sub_led_to_led(sub_led); + int fled_id = sub_led->fled_id; + int ret; + + mutex_lock(&led->lock); + + if (!state) { + ret = max77693_clear_mode(led, MODE_FLASH(fled_id)); + goto unlock; + } + + if (sub_led->flash_timeout != led->current_flash_timeout) { + ret = max77693_set_timeout(led, sub_led->flash_timeout); + if (ret < 0) + goto unlock; + } + + led->strobing_sub_led_id = fled_id; + + ret = max77693_add_mode(led, MODE_FLASH(fled_id)); + if (ret < 0) + goto unlock; + + ret = max77693_get_flash_faults(sub_led); + +unlock: + mutex_unlock(&led->lock); + return ret; +} + +static int max77693_led_flash_fault_get( + struct led_classdev_flash *fled_cdev, + u32 *fault) +{ + struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev); + + *fault = sub_led->flash_faults; + + return 0; +} + +static int max77693_led_flash_strobe_get( + struct led_classdev_flash *fled_cdev, + bool *state) +{ + struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev); + struct max77693_led_device *led = sub_led_to_led(sub_led); + int ret; + + if (!state) + return -EINVAL; + + mutex_lock(&led->lock); + + ret = max77693_get_strobe_status(led, state); + + *state = !!(*state && (led->strobing_sub_led_id == sub_led->fled_id)); + + mutex_unlock(&led->lock); + + return ret; +} + +static int max77693_led_flash_timeout_set( + struct led_classdev_flash *fled_cdev, + u32 timeout) +{ + struct max77693_sub_led *sub_led = flcdev_to_sub_led(fled_cdev); + struct max77693_led_device *led = sub_led_to_led(sub_led); + + mutex_lock(&led->lock); + sub_led->flash_timeout = timeout; + mutex_unlock(&led->lock); + + return 0; +} + +static int max77693_led_parse_dt(struct max77693_led_device *led, + struct max77693_led_config_data *cfg) +{ + struct device *dev = &led->pdev->dev; + struct max77693_sub_led *sub_leds = led->sub_leds; + struct device_node *node = dev->of_node, *child_node; + struct property *prop; + u32 led_sources[2]; + int i, ret, fled_id; + + of_property_read_u32(node, "maxim,boost-mode", &cfg->boost_mode); + of_property_read_u32(node, "maxim,boost-mvout", &cfg->boost_vout); + of_property_read_u32(node, "maxim,mvsys-min", &cfg->low_vsys); + + for_each_available_child_of_node(node, child_node) { + prop = of_find_property(child_node, "led-sources", NULL); + if (prop) { + const __be32 *srcs = NULL; + + for (i = 0; i < ARRAY_SIZE(led_sources); ++i) { + srcs = of_prop_next_u32(prop, srcs, + &led_sources[i]); + if (!srcs) + break; + } + } else { + dev_err(dev, + "led-sources DT property missing\n"); + of_node_put(child_node); + return -EINVAL; + } + + if (i == 2) { + fled_id = FLED1; + led->fled_mask = FLED1_IOUT | FLED2_IOUT; + } else if (led_sources[0] == FLED1) { + fled_id = FLED1; + led->fled_mask |= FLED1_IOUT; + } else if (led_sources[0] == FLED2) { + fled_id = FLED2; + led->fled_mask |= FLED2_IOUT; + } else { + dev_err(dev, + "Wrong led-sources DT property value.\n"); + of_node_put(child_node); + return -EINVAL; + } + + sub_leds[fled_id].fled_id = fled_id; + + cfg->label[fled_id] = + of_get_property(child_node, "label", NULL) ? : + child_node->name; + + ret = of_property_read_u32(child_node, "led-max-microamp", + &cfg->iout_torch_max[fled_id]); + if (ret < 0) { + cfg->iout_torch_max[fled_id] = TORCH_IOUT_MIN; + dev_warn(dev, "led-max-microamp DT property missing\n"); + } + + ret = of_property_read_u32(child_node, "flash-max-microamp", + &cfg->iout_flash_max[fled_id]); + if (ret < 0) { + cfg->iout_flash_max[fled_id] = FLASH_IOUT_MIN; + dev_warn(dev, + "flash-max-microamp DT property missing\n"); + } + + ret = of_property_read_u32(child_node, "flash-max-timeout-us", + &cfg->flash_timeout_max[fled_id]); + if (ret < 0) { + cfg->flash_timeout_max[fled_id] = FLASH_TIMEOUT_MIN; + dev_warn(dev, + "flash-max-timeout-us DT property missing\n"); + } + + if (++cfg->num_leds == 2 || + (max77693_fled_used(led, FLED1) && + max77693_fled_used(led, FLED2))) { + of_node_put(child_node); + break; + } + } + + if (cfg->num_leds == 0) { + dev_err(dev, "No DT child node found for connected LED(s).\n"); + return -EINVAL; + } + + return 0; +} + +static void clamp_align(u32 *v, u32 min, u32 max, u32 step) +{ + *v = clamp_val(*v, min, max); + if (step > 1) + *v = (*v - min) / step * step + min; +} + +static void max77693_align_iout_current(struct max77693_led_device *led, + u32 *iout, u32 min, u32 max, u32 step) +{ + int i; + + if (led->iout_joint) { + if (iout[FLED1] > min) { + iout[FLED1] /= 2; + iout[FLED2] = iout[FLED1]; + } else { + iout[FLED1] = min; + iout[FLED2] = 0; + return; + } + } + + for (i = FLED1; i <= FLED2; ++i) + if (max77693_fled_used(led, i)) + clamp_align(&iout[i], min, max, step); + else + iout[i] = 0; +} + +static void max77693_led_validate_configuration(struct max77693_led_device *led, + struct max77693_led_config_data *cfg) +{ + u32 flash_iout_max = cfg->boost_mode ? FLASH_IOUT_MAX_2LEDS : + FLASH_IOUT_MAX_1LED; + int i; + + if (cfg->num_leds == 1 && + max77693_fled_used(led, FLED1) && max77693_fled_used(led, FLED2)) + led->iout_joint = true; + + cfg->boost_mode = clamp_val(cfg->boost_mode, MAX77693_LED_BOOST_NONE, + MAX77693_LED_BOOST_FIXED); + + /* Boost must be enabled if both current outputs are used */ + if ((cfg->boost_mode == MAX77693_LED_BOOST_NONE) && led->iout_joint) + cfg->boost_mode = MAX77693_LED_BOOST_FIXED; + + max77693_align_iout_current(led, cfg->iout_torch_max, + TORCH_IOUT_MIN, TORCH_IOUT_MAX, TORCH_IOUT_STEP); + + max77693_align_iout_current(led, cfg->iout_flash_max, + FLASH_IOUT_MIN, flash_iout_max, FLASH_IOUT_STEP); + + for (i = 0; i < ARRAY_SIZE(cfg->flash_timeout_max); ++i) + clamp_align(&cfg->flash_timeout_max[i], FLASH_TIMEOUT_MIN, + FLASH_TIMEOUT_MAX, FLASH_TIMEOUT_STEP); + + clamp_align(&cfg->boost_vout, FLASH_VOUT_MIN, FLASH_VOUT_MAX, + FLASH_VOUT_STEP); + + if (cfg->low_vsys) + clamp_align(&cfg->low_vsys, MAX_FLASH1_VSYS_MIN, + MAX_FLASH1_VSYS_MAX, MAX_FLASH1_VSYS_STEP); +} + +static int max77693_led_get_configuration(struct max77693_led_device *led, + struct max77693_led_config_data *cfg) +{ + int ret; + + ret = max77693_led_parse_dt(led, cfg); + if (ret < 0) + return ret; + + max77693_led_validate_configuration(led, cfg); + + memcpy(led->iout_torch_max, cfg->iout_torch_max, + sizeof(led->iout_torch_max)); + memcpy(led->iout_flash_max, cfg->iout_flash_max, + sizeof(led->iout_flash_max)); + + return 0; +} + +static const struct led_flash_ops flash_ops = { + .flash_brightness_set = max77693_led_flash_brightness_set, + .strobe_set = max77693_led_flash_strobe_set, + .strobe_get = max77693_led_flash_strobe_get, + .timeout_set = max77693_led_flash_timeout_set, + .fault_get = max77693_led_flash_fault_get, +}; + +static void max77693_init_flash_settings(struct max77693_sub_led *sub_led, + struct max77693_led_config_data *led_cfg) +{ + struct led_classdev_flash *fled_cdev = &sub_led->fled_cdev; + struct max77693_led_device *led = sub_led_to_led(sub_led); + int fled_id = sub_led->fled_id; + struct led_flash_setting *setting; + + /* Init flash intensity setting */ + setting = &fled_cdev->brightness; + setting->min = FLASH_IOUT_MIN; + setting->max = led->iout_joint ? + led_cfg->iout_flash_max[FLED1] + + led_cfg->iout_flash_max[FLED2] : + led_cfg->iout_flash_max[fled_id]; + setting->step = FLASH_IOUT_STEP; + setting->val = setting->max; + + /* Init flash timeout setting */ + setting = &fled_cdev->timeout; + setting->min = FLASH_TIMEOUT_MIN; + setting->max = led_cfg->flash_timeout_max[fled_id]; + setting->step = FLASH_TIMEOUT_STEP; + setting->val = setting->max; +} + +static void max77693_init_fled_cdev(struct max77693_sub_led *sub_led, + struct max77693_led_config_data *led_cfg) +{ + struct max77693_led_device *led = sub_led_to_led(sub_led); + int fled_id = sub_led->fled_id; + struct led_classdev_flash *fled_cdev; + struct led_classdev *led_cdev; + + /* Initialize LED Flash class device */ + fled_cdev = &sub_led->fled_cdev; + fled_cdev->ops = &flash_ops; + led_cdev = &fled_cdev->led_cdev; + + led_cdev->name = led_cfg->label[fled_id]; + + led_cdev->brightness_set = max77693_led_brightness_set; + led_cdev->brightness_set_sync = max77693_led_brightness_set_sync; + led_cdev->max_brightness = (led->iout_joint ? + led_cfg->iout_torch_max[FLED1] + + led_cfg->iout_torch_max[FLED2] : + led_cfg->iout_torch_max[fled_id]) / + TORCH_IOUT_STEP; + led_cdev->flags |= LED_DEV_CAP_FLASH; + INIT_WORK(&sub_led->work_brightness_set, + max77693_led_brightness_set_work); + + max77693_init_flash_settings(sub_led, led_cfg); + + /* Init flash timeout cache */ + sub_led->flash_timeout = fled_cdev->timeout.val; +} + +static int max77693_led_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct max77693_dev *iodev = dev_get_drvdata(dev->parent); + struct max77693_led_device *led; + struct max77693_sub_led *sub_leds; + struct max77693_led_config_data led_cfg = {}; + int init_fled_cdev[2], i, ret; + + led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL); + if (!led) + return -ENOMEM; + + led->pdev = pdev; + led->regmap = iodev->regmap; + led->allowed_modes = MODE_FLASH_MASK; + sub_leds = led->sub_leds; + + platform_set_drvdata(pdev, led); + ret = max77693_led_get_configuration(led, &led_cfg); + if (ret < 0) + return ret; + + ret = max77693_setup(led, &led_cfg); + if (ret < 0) + return ret; + + mutex_init(&led->lock); + + init_fled_cdev[FLED1] = + led->iout_joint || max77693_fled_used(led, FLED1); + init_fled_cdev[FLED2] = + !led->iout_joint && max77693_fled_used(led, FLED2); + + for (i = FLED1; i <= FLED2; ++i) { + if (!init_fled_cdev[i]) + continue; + + /* Initialize LED Flash class device */ + max77693_init_fled_cdev(&sub_leds[i], &led_cfg); + + /* Register LED Flash class device */ + ret = led_classdev_flash_register(dev, &sub_leds[i].fled_cdev); + if (ret < 0) { + /* + * At this moment FLED1 might have been already + * registered and it needs to be released. + */ + if (i == FLED2) + goto err_register_led2; + else + goto err_register_led1; + } + } + + return 0; + +err_register_led2: + /* It is possible than only FLED2 was to be registered */ + if (!init_fled_cdev[FLED1]) + goto err_register_led1; + led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev); +err_register_led1: + mutex_destroy(&led->lock); + + return ret; +} + +static int max77693_led_remove(struct platform_device *pdev) +{ + struct max77693_led_device *led = platform_get_drvdata(pdev); + struct max77693_sub_led *sub_leds = led->sub_leds; + + if (led->iout_joint || max77693_fled_used(led, FLED1)) { + led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev); + cancel_work_sync(&sub_leds[FLED1].work_brightness_set); + } + + if (!led->iout_joint && max77693_fled_used(led, FLED2)) { + led_classdev_flash_unregister(&sub_leds[FLED2].fled_cdev); + cancel_work_sync(&sub_leds[FLED2].work_brightness_set); + } + + mutex_destroy(&led->lock); + + return 0; +} + +static const struct of_device_id max77693_led_dt_match[] = { + { .compatible = "maxim,max77693-led" }, + {}, +}; + +static struct platform_driver max77693_led_driver = { + .probe = max77693_led_probe, + .remove = max77693_led_remove, + .driver = { + .name = "max77693-led", + .of_match_table = max77693_led_dt_match, + }, +}; + +module_platform_driver(max77693_led_driver); + +MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@samsung.com>"); +MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>"); +MODULE_DESCRIPTION("Maxim MAX77693 led flash driver"); +MODULE_LICENSE("GPL v2");