diff options
Diffstat (limited to 'drivers/leds/leds-lm3533.c')
| -rw-r--r-- | drivers/leds/leds-lm3533.c | 757 |
1 files changed, 757 insertions, 0 deletions
diff --git a/drivers/leds/leds-lm3533.c b/drivers/leds/leds-lm3533.c new file mode 100644 index 000000000..b3edee703 --- /dev/null +++ b/drivers/leds/leds-lm3533.c @@ -0,0 +1,757 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * leds-lm3533.c -- LM3533 LED driver + * + * Copyright (C) 2011-2012 Texas Instruments + * + * Author: Johan Hovold <jhovold@gmail.com> + */ + +#include <linux/module.h> +#include <linux/leds.h> +#include <linux/mfd/core.h> +#include <linux/mutex.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include <linux/mfd/lm3533.h> + + +#define LM3533_LVCTRLBANK_MIN 2 +#define LM3533_LVCTRLBANK_MAX 5 +#define LM3533_LVCTRLBANK_COUNT 4 +#define LM3533_RISEFALLTIME_MAX 7 +#define LM3533_ALS_CHANNEL_LV_MIN 1 +#define LM3533_ALS_CHANNEL_LV_MAX 2 + +#define LM3533_REG_CTRLBANK_BCONF_BASE 0x1b +#define LM3533_REG_PATTERN_ENABLE 0x28 +#define LM3533_REG_PATTERN_LOW_TIME_BASE 0x71 +#define LM3533_REG_PATTERN_HIGH_TIME_BASE 0x72 +#define LM3533_REG_PATTERN_RISETIME_BASE 0x74 +#define LM3533_REG_PATTERN_FALLTIME_BASE 0x75 + +#define LM3533_REG_PATTERN_STEP 0x10 + +#define LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK 0x04 +#define LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK 0x02 +#define LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK 0x01 + +#define LM3533_LED_FLAG_PATTERN_ENABLE 1 + + +struct lm3533_led { + struct lm3533 *lm3533; + struct lm3533_ctrlbank cb; + struct led_classdev cdev; + int id; + + struct mutex mutex; + unsigned long flags; +}; + + +static inline struct lm3533_led *to_lm3533_led(struct led_classdev *cdev) +{ + return container_of(cdev, struct lm3533_led, cdev); +} + +static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led) +{ + return led->id + 2; +} + +static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base) +{ + return base + led->id; +} + +static inline u8 lm3533_led_get_pattern(struct lm3533_led *led) +{ + return led->id; +} + +static inline u8 lm3533_led_get_pattern_reg(struct lm3533_led *led, + u8 base) +{ + return base + lm3533_led_get_pattern(led) * LM3533_REG_PATTERN_STEP; +} + +static int lm3533_led_pattern_enable(struct lm3533_led *led, int enable) +{ + u8 mask; + u8 val; + int pattern; + int state; + int ret = 0; + + dev_dbg(led->cdev.dev, "%s - %d\n", __func__, enable); + + mutex_lock(&led->mutex); + + state = test_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags); + if ((enable && state) || (!enable && !state)) + goto out; + + pattern = lm3533_led_get_pattern(led); + mask = 1 << (2 * pattern); + + if (enable) + val = mask; + else + val = 0; + + ret = lm3533_update(led->lm3533, LM3533_REG_PATTERN_ENABLE, val, mask); + if (ret) { + dev_err(led->cdev.dev, "failed to enable pattern %d (%d)\n", + pattern, enable); + goto out; + } + + __change_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags); +out: + mutex_unlock(&led->mutex); + + return ret; +} + +static int lm3533_led_set(struct led_classdev *cdev, + enum led_brightness value) +{ + struct lm3533_led *led = to_lm3533_led(cdev); + + dev_dbg(led->cdev.dev, "%s - %d\n", __func__, value); + + if (value == 0) + lm3533_led_pattern_enable(led, 0); /* disable blink */ + + return lm3533_ctrlbank_set_brightness(&led->cb, value); +} + +static enum led_brightness lm3533_led_get(struct led_classdev *cdev) +{ + struct lm3533_led *led = to_lm3533_led(cdev); + u8 val; + int ret; + + ret = lm3533_ctrlbank_get_brightness(&led->cb, &val); + if (ret) + return ret; + + dev_dbg(led->cdev.dev, "%s - %u\n", __func__, val); + + return val; +} + +/* Pattern generator defines (delays in us). */ +#define LM3533_LED_DELAY1_VMIN 0x00 +#define LM3533_LED_DELAY2_VMIN 0x3d +#define LM3533_LED_DELAY3_VMIN 0x80 + +#define LM3533_LED_DELAY1_VMAX (LM3533_LED_DELAY2_VMIN - 1) +#define LM3533_LED_DELAY2_VMAX (LM3533_LED_DELAY3_VMIN - 1) +#define LM3533_LED_DELAY3_VMAX 0xff + +#define LM3533_LED_DELAY1_TMIN 16384U +#define LM3533_LED_DELAY2_TMIN 1130496U +#define LM3533_LED_DELAY3_TMIN 10305536U + +#define LM3533_LED_DELAY1_TMAX 999424U +#define LM3533_LED_DELAY2_TMAX 9781248U +#define LM3533_LED_DELAY3_TMAX 76890112U + +/* t_step = (t_max - t_min) / (v_max - v_min) */ +#define LM3533_LED_DELAY1_TSTEP 16384 +#define LM3533_LED_DELAY2_TSTEP 131072 +#define LM3533_LED_DELAY3_TSTEP 524288 + +/* Delay limits for hardware accelerated blinking (in ms). */ +#define LM3533_LED_DELAY_ON_MAX \ + ((LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY2_TSTEP / 2) / 1000) +#define LM3533_LED_DELAY_OFF_MAX \ + ((LM3533_LED_DELAY3_TMAX + LM3533_LED_DELAY3_TSTEP / 2) / 1000) + +/* + * Returns linear map of *t from [t_min,t_max] to [v_min,v_max] with a step + * size of t_step, where + * + * t_step = (t_max - t_min) / (v_max - v_min) + * + * and updates *t to reflect the mapped value. + */ +static u8 time_to_val(unsigned *t, unsigned t_min, unsigned t_step, + u8 v_min, u8 v_max) +{ + unsigned val; + + val = (*t + t_step / 2 - t_min) / t_step + v_min; + + *t = t_step * (val - v_min) + t_min; + + return (u8)val; +} + +/* + * Returns time code corresponding to *delay (in ms) and updates *delay to + * reflect actual hardware delay. + * + * Hardware supports 256 discrete delay times, divided into three groups with + * the following ranges and step-sizes: + * + * [ 16, 999] [0x00, 0x3e] step 16 ms + * [ 1130, 9781] [0x3d, 0x7f] step 131 ms + * [10306, 76890] [0x80, 0xff] step 524 ms + * + * Note that delay group 3 is only available for delay_off. + */ +static u8 lm3533_led_get_hw_delay(unsigned *delay) +{ + unsigned t; + u8 val; + + t = *delay * 1000; + + if (t >= (LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY3_TMIN) / 2) { + t = clamp(t, LM3533_LED_DELAY3_TMIN, LM3533_LED_DELAY3_TMAX); + val = time_to_val(&t, LM3533_LED_DELAY3_TMIN, + LM3533_LED_DELAY3_TSTEP, + LM3533_LED_DELAY3_VMIN, + LM3533_LED_DELAY3_VMAX); + } else if (t >= (LM3533_LED_DELAY1_TMAX + LM3533_LED_DELAY2_TMIN) / 2) { + t = clamp(t, LM3533_LED_DELAY2_TMIN, LM3533_LED_DELAY2_TMAX); + val = time_to_val(&t, LM3533_LED_DELAY2_TMIN, + LM3533_LED_DELAY2_TSTEP, + LM3533_LED_DELAY2_VMIN, + LM3533_LED_DELAY2_VMAX); + } else { + t = clamp(t, LM3533_LED_DELAY1_TMIN, LM3533_LED_DELAY1_TMAX); + val = time_to_val(&t, LM3533_LED_DELAY1_TMIN, + LM3533_LED_DELAY1_TSTEP, + LM3533_LED_DELAY1_VMIN, + LM3533_LED_DELAY1_VMAX); + } + + *delay = (t + 500) / 1000; + + return val; +} + +/* + * Set delay register base to *delay (in ms) and update *delay to reflect + * actual hardware delay used. + */ +static u8 lm3533_led_delay_set(struct lm3533_led *led, u8 base, + unsigned long *delay) +{ + unsigned t; + u8 val; + u8 reg; + int ret; + + t = (unsigned)*delay; + + /* Delay group 3 is only available for low time (delay off). */ + if (base != LM3533_REG_PATTERN_LOW_TIME_BASE) + t = min(t, LM3533_LED_DELAY2_TMAX / 1000); + + val = lm3533_led_get_hw_delay(&t); + + dev_dbg(led->cdev.dev, "%s - %lu: %u (0x%02x)\n", __func__, + *delay, t, val); + reg = lm3533_led_get_pattern_reg(led, base); + ret = lm3533_write(led->lm3533, reg, val); + if (ret) + dev_err(led->cdev.dev, "failed to set delay (%02x)\n", reg); + + *delay = t; + + return ret; +} + +static int lm3533_led_delay_on_set(struct lm3533_led *led, unsigned long *t) +{ + return lm3533_led_delay_set(led, LM3533_REG_PATTERN_HIGH_TIME_BASE, t); +} + +static int lm3533_led_delay_off_set(struct lm3533_led *led, unsigned long *t) +{ + return lm3533_led_delay_set(led, LM3533_REG_PATTERN_LOW_TIME_BASE, t); +} + +static int lm3533_led_blink_set(struct led_classdev *cdev, + unsigned long *delay_on, + unsigned long *delay_off) +{ + struct lm3533_led *led = to_lm3533_led(cdev); + int ret; + + dev_dbg(led->cdev.dev, "%s - on = %lu, off = %lu\n", __func__, + *delay_on, *delay_off); + + if (*delay_on > LM3533_LED_DELAY_ON_MAX || + *delay_off > LM3533_LED_DELAY_OFF_MAX) + return -EINVAL; + + if (*delay_on == 0 && *delay_off == 0) { + *delay_on = 500; + *delay_off = 500; + } + + ret = lm3533_led_delay_on_set(led, delay_on); + if (ret) + return ret; + + ret = lm3533_led_delay_off_set(led, delay_off); + if (ret) + return ret; + + return lm3533_led_pattern_enable(led, 1); +} + +static ssize_t show_id(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct lm3533_led *led = to_lm3533_led(led_cdev); + + return scnprintf(buf, PAGE_SIZE, "%d\n", led->id); +} + +/* + * Pattern generator rise/fall times: + * + * 0 - 2048 us (default) + * 1 - 262 ms + * 2 - 524 ms + * 3 - 1.049 s + * 4 - 2.097 s + * 5 - 4.194 s + * 6 - 8.389 s + * 7 - 16.78 s + */ +static ssize_t show_risefalltime(struct device *dev, + struct device_attribute *attr, + char *buf, u8 base) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct lm3533_led *led = to_lm3533_led(led_cdev); + ssize_t ret; + u8 reg; + u8 val; + + reg = lm3533_led_get_pattern_reg(led, base); + ret = lm3533_read(led->lm3533, reg, &val); + if (ret) + return ret; + + return scnprintf(buf, PAGE_SIZE, "%x\n", val); +} + +static ssize_t show_risetime(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return show_risefalltime(dev, attr, buf, + LM3533_REG_PATTERN_RISETIME_BASE); +} + +static ssize_t show_falltime(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return show_risefalltime(dev, attr, buf, + LM3533_REG_PATTERN_FALLTIME_BASE); +} + +static ssize_t store_risefalltime(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len, u8 base) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct lm3533_led *led = to_lm3533_led(led_cdev); + u8 val; + u8 reg; + int ret; + + if (kstrtou8(buf, 0, &val) || val > LM3533_RISEFALLTIME_MAX) + return -EINVAL; + + reg = lm3533_led_get_pattern_reg(led, base); + ret = lm3533_write(led->lm3533, reg, val); + if (ret) + return ret; + + return len; +} + +static ssize_t store_risetime(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + return store_risefalltime(dev, attr, buf, len, + LM3533_REG_PATTERN_RISETIME_BASE); +} + +static ssize_t store_falltime(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + return store_risefalltime(dev, attr, buf, len, + LM3533_REG_PATTERN_FALLTIME_BASE); +} + +static ssize_t show_als_channel(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct lm3533_led *led = to_lm3533_led(led_cdev); + unsigned channel; + u8 reg; + u8 val; + int ret; + + reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE); + ret = lm3533_read(led->lm3533, reg, &val); + if (ret) + return ret; + + channel = (val & LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK) + 1; + + return scnprintf(buf, PAGE_SIZE, "%u\n", channel); +} + +static ssize_t store_als_channel(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct lm3533_led *led = to_lm3533_led(led_cdev); + unsigned channel; + u8 reg; + u8 val; + u8 mask; + int ret; + + if (kstrtouint(buf, 0, &channel)) + return -EINVAL; + + if (channel < LM3533_ALS_CHANNEL_LV_MIN || + channel > LM3533_ALS_CHANNEL_LV_MAX) + return -EINVAL; + + reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE); + mask = LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK; + val = channel - 1; + + ret = lm3533_update(led->lm3533, reg, val, mask); + if (ret) + return ret; + + return len; +} + +static ssize_t show_als_en(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct lm3533_led *led = to_lm3533_led(led_cdev); + bool enable; + u8 reg; + u8 val; + int ret; + + reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE); + ret = lm3533_read(led->lm3533, reg, &val); + if (ret) + return ret; + + enable = val & LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK; + + return scnprintf(buf, PAGE_SIZE, "%d\n", enable); +} + +static ssize_t store_als_en(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct lm3533_led *led = to_lm3533_led(led_cdev); + unsigned enable; + u8 reg; + u8 mask; + u8 val; + int ret; + + if (kstrtouint(buf, 0, &enable)) + return -EINVAL; + + reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE); + mask = LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK; + + if (enable) + val = mask; + else + val = 0; + + ret = lm3533_update(led->lm3533, reg, val, mask); + if (ret) + return ret; + + return len; +} + +static ssize_t show_linear(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct lm3533_led *led = to_lm3533_led(led_cdev); + u8 reg; + u8 val; + int linear; + int ret; + + reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE); + ret = lm3533_read(led->lm3533, reg, &val); + if (ret) + return ret; + + if (val & LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK) + linear = 1; + else + linear = 0; + + return scnprintf(buf, PAGE_SIZE, "%x\n", linear); +} + +static ssize_t store_linear(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct lm3533_led *led = to_lm3533_led(led_cdev); + unsigned long linear; + u8 reg; + u8 mask; + u8 val; + int ret; + + if (kstrtoul(buf, 0, &linear)) + return -EINVAL; + + reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE); + mask = LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK; + + if (linear) + val = mask; + else + val = 0; + + ret = lm3533_update(led->lm3533, reg, val, mask); + if (ret) + return ret; + + return len; +} + +static ssize_t show_pwm(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct lm3533_led *led = to_lm3533_led(led_cdev); + u8 val; + int ret; + + ret = lm3533_ctrlbank_get_pwm(&led->cb, &val); + if (ret) + return ret; + + return scnprintf(buf, PAGE_SIZE, "%u\n", val); +} + +static ssize_t store_pwm(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct lm3533_led *led = to_lm3533_led(led_cdev); + u8 val; + int ret; + + if (kstrtou8(buf, 0, &val)) + return -EINVAL; + + ret = lm3533_ctrlbank_set_pwm(&led->cb, val); + if (ret) + return ret; + + return len; +} + +static LM3533_ATTR_RW(als_channel); +static LM3533_ATTR_RW(als_en); +static LM3533_ATTR_RW(falltime); +static LM3533_ATTR_RO(id); +static LM3533_ATTR_RW(linear); +static LM3533_ATTR_RW(pwm); +static LM3533_ATTR_RW(risetime); + +static struct attribute *lm3533_led_attributes[] = { + &dev_attr_als_channel.attr, + &dev_attr_als_en.attr, + &dev_attr_falltime.attr, + &dev_attr_id.attr, + &dev_attr_linear.attr, + &dev_attr_pwm.attr, + &dev_attr_risetime.attr, + NULL, +}; + +static umode_t lm3533_led_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct led_classdev *led_cdev = dev_get_drvdata(dev); + struct lm3533_led *led = to_lm3533_led(led_cdev); + umode_t mode = attr->mode; + + if (attr == &dev_attr_als_channel.attr || + attr == &dev_attr_als_en.attr) { + if (!led->lm3533->have_als) + mode = 0; + } + + return mode; +}; + +static const struct attribute_group lm3533_led_attribute_group = { + .is_visible = lm3533_led_attr_is_visible, + .attrs = lm3533_led_attributes +}; + +static const struct attribute_group *lm3533_led_attribute_groups[] = { + &lm3533_led_attribute_group, + NULL +}; + +static int lm3533_led_setup(struct lm3533_led *led, + struct lm3533_led_platform_data *pdata) +{ + int ret; + + ret = lm3533_ctrlbank_set_max_current(&led->cb, pdata->max_current); + if (ret) + return ret; + + return lm3533_ctrlbank_set_pwm(&led->cb, pdata->pwm); +} + +static int lm3533_led_probe(struct platform_device *pdev) +{ + struct lm3533 *lm3533; + struct lm3533_led_platform_data *pdata; + struct lm3533_led *led; + int ret; + + dev_dbg(&pdev->dev, "%s\n", __func__); + + lm3533 = dev_get_drvdata(pdev->dev.parent); + if (!lm3533) + return -EINVAL; + + pdata = dev_get_platdata(&pdev->dev); + if (!pdata) { + dev_err(&pdev->dev, "no platform data\n"); + return -EINVAL; + } + + if (pdev->id < 0 || pdev->id >= LM3533_LVCTRLBANK_COUNT) { + dev_err(&pdev->dev, "illegal LED id %d\n", pdev->id); + return -EINVAL; + } + + led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL); + if (!led) + return -ENOMEM; + + led->lm3533 = lm3533; + led->cdev.name = pdata->name; + led->cdev.default_trigger = pdata->default_trigger; + led->cdev.brightness_set_blocking = lm3533_led_set; + led->cdev.brightness_get = lm3533_led_get; + led->cdev.blink_set = lm3533_led_blink_set; + led->cdev.brightness = LED_OFF; + led->cdev.groups = lm3533_led_attribute_groups, + led->id = pdev->id; + + mutex_init(&led->mutex); + + /* The class framework makes a callback to get brightness during + * registration so use parent device (for error reporting) until + * registered. + */ + led->cb.lm3533 = lm3533; + led->cb.id = lm3533_led_get_ctrlbank_id(led); + led->cb.dev = lm3533->dev; + + platform_set_drvdata(pdev, led); + + ret = led_classdev_register(pdev->dev.parent, &led->cdev); + if (ret) { + dev_err(&pdev->dev, "failed to register LED %d\n", pdev->id); + return ret; + } + + led->cb.dev = led->cdev.dev; + + ret = lm3533_led_setup(led, pdata); + if (ret) + goto err_deregister; + + ret = lm3533_ctrlbank_enable(&led->cb); + if (ret) + goto err_deregister; + + return 0; + +err_deregister: + led_classdev_unregister(&led->cdev); + + return ret; +} + +static int lm3533_led_remove(struct platform_device *pdev) +{ + struct lm3533_led *led = platform_get_drvdata(pdev); + + dev_dbg(&pdev->dev, "%s\n", __func__); + + lm3533_ctrlbank_disable(&led->cb); + led_classdev_unregister(&led->cdev); + + return 0; +} + +static void lm3533_led_shutdown(struct platform_device *pdev) +{ + + struct lm3533_led *led = platform_get_drvdata(pdev); + + dev_dbg(&pdev->dev, "%s\n", __func__); + + lm3533_ctrlbank_disable(&led->cb); + lm3533_led_set(&led->cdev, LED_OFF); /* disable blink */ +} + +static struct platform_driver lm3533_led_driver = { + .driver = { + .name = "lm3533-leds", + }, + .probe = lm3533_led_probe, + .remove = lm3533_led_remove, + .shutdown = lm3533_led_shutdown, +}; +module_platform_driver(lm3533_led_driver); + +MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>"); +MODULE_DESCRIPTION("LM3533 LED driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:lm3533-leds"); |