diff options
Diffstat (limited to 'drivers/leds/leds-lp8788.c')
| -rw-r--r-- | drivers/leds/leds-lp8788.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/drivers/leds/leds-lp8788.c b/drivers/leds/leds-lp8788.c new file mode 100644 index 000000000..9b9525ccc --- /dev/null +++ b/drivers/leds/leds-lp8788.c @@ -0,0 +1,171 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * TI LP8788 MFD - keyled driver + * + * Copyright 2012 Texas Instruments + * + * Author: Milo(Woogyom) Kim <milo.kim@ti.com> + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/leds.h> +#include <linux/mutex.h> +#include <linux/mfd/lp8788.h> +#include <linux/mfd/lp8788-isink.h> + +#define MAX_BRIGHTNESS LP8788_ISINK_MAX_PWM +#define DEFAULT_LED_NAME "keyboard-backlight" + +struct lp8788_led { + struct lp8788 *lp; + struct mutex lock; + struct led_classdev led_dev; + enum lp8788_isink_number isink_num; + int on; +}; + +struct lp8788_led_config { + enum lp8788_isink_scale scale; + enum lp8788_isink_number num; + int iout; +}; + +static struct lp8788_led_config default_led_config = { + .scale = LP8788_ISINK_SCALE_100mA, + .num = LP8788_ISINK_3, + .iout = 0, +}; + +static int lp8788_led_init_device(struct lp8788_led *led, + struct lp8788_led_platform_data *pdata) +{ + struct lp8788_led_config *cfg = &default_led_config; + u8 addr, mask, val; + int ret; + + if (pdata) { + cfg->scale = pdata->scale; + cfg->num = pdata->num; + cfg->iout = pdata->iout_code; + } + + led->isink_num = cfg->num; + + /* scale configuration */ + addr = LP8788_ISINK_CTRL; + mask = 1 << (cfg->num + LP8788_ISINK_SCALE_OFFSET); + val = cfg->scale << (cfg->num + LP8788_ISINK_SCALE_OFFSET); + ret = lp8788_update_bits(led->lp, addr, mask, val); + if (ret) + return ret; + + /* current configuration */ + addr = lp8788_iout_addr[cfg->num]; + mask = lp8788_iout_mask[cfg->num]; + val = cfg->iout; + + return lp8788_update_bits(led->lp, addr, mask, val); +} + +static int lp8788_led_enable(struct lp8788_led *led, + enum lp8788_isink_number num, int on) +{ + int ret; + + u8 mask = 1 << num; + u8 val = on << num; + + ret = lp8788_update_bits(led->lp, LP8788_ISINK_CTRL, mask, val); + if (ret == 0) + led->on = on; + + return ret; +} + +static int lp8788_brightness_set(struct led_classdev *led_cdev, + enum led_brightness val) +{ + struct lp8788_led *led = + container_of(led_cdev, struct lp8788_led, led_dev); + + enum lp8788_isink_number num = led->isink_num; + int enable, ret; + + mutex_lock(&led->lock); + + switch (num) { + case LP8788_ISINK_1: + case LP8788_ISINK_2: + case LP8788_ISINK_3: + ret = lp8788_write_byte(led->lp, lp8788_pwm_addr[num], val); + if (ret < 0) + goto unlock; + break; + default: + mutex_unlock(&led->lock); + return -EINVAL; + } + + enable = (val > 0) ? 1 : 0; + if (enable != led->on) + ret = lp8788_led_enable(led, num, enable); +unlock: + mutex_unlock(&led->lock); + return ret; +} + +static int lp8788_led_probe(struct platform_device *pdev) +{ + struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent); + struct lp8788_led_platform_data *led_pdata; + struct lp8788_led *led; + struct device *dev = &pdev->dev; + int ret; + + led = devm_kzalloc(dev, sizeof(struct lp8788_led), GFP_KERNEL); + if (!led) + return -ENOMEM; + + led->lp = lp; + led->led_dev.max_brightness = MAX_BRIGHTNESS; + led->led_dev.brightness_set_blocking = lp8788_brightness_set; + + led_pdata = lp->pdata ? lp->pdata->led_pdata : NULL; + + if (!led_pdata || !led_pdata->name) + led->led_dev.name = DEFAULT_LED_NAME; + else + led->led_dev.name = led_pdata->name; + + mutex_init(&led->lock); + + ret = lp8788_led_init_device(led, led_pdata); + if (ret) { + dev_err(dev, "led init device err: %d\n", ret); + return ret; + } + + ret = devm_led_classdev_register(dev, &led->led_dev); + if (ret) { + dev_err(dev, "led register err: %d\n", ret); + return ret; + } + + return 0; +} + +static struct platform_driver lp8788_led_driver = { + .probe = lp8788_led_probe, + .driver = { + .name = LP8788_DEV_KEYLED, + }, +}; +module_platform_driver(lp8788_led_driver); + +MODULE_DESCRIPTION("Texas Instruments LP8788 Keyboard LED Driver"); +MODULE_AUTHOR("Milo Kim"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:lp8788-keyled"); |