^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * TI LP8788 MFD - keyled driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright 2012 Texas Instruments
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/leds.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/mfd/lp8788.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/mfd/lp8788-isink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define MAX_BRIGHTNESS LP8788_ISINK_MAX_PWM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define DEFAULT_LED_NAME "keyboard-backlight"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct lp8788_led {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct lp8788 *lp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct mutex lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct led_classdev led_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) enum lp8788_isink_number isink_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) int on;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct lp8788_led_config {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) enum lp8788_isink_scale scale;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) enum lp8788_isink_number num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) int iout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static struct lp8788_led_config default_led_config = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) .scale = LP8788_ISINK_SCALE_100mA,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) .num = LP8788_ISINK_3,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) .iout = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static int lp8788_led_init_device(struct lp8788_led *led,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct lp8788_led_platform_data *pdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct lp8788_led_config *cfg = &default_led_config;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) u8 addr, mask, val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (pdata) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) cfg->scale = pdata->scale;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) cfg->num = pdata->num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) cfg->iout = pdata->iout_code;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) led->isink_num = cfg->num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) /* scale configuration */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) addr = LP8788_ISINK_CTRL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) mask = 1 << (cfg->num + LP8788_ISINK_SCALE_OFFSET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) val = cfg->scale << (cfg->num + LP8788_ISINK_SCALE_OFFSET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) ret = lp8788_update_bits(led->lp, addr, mask, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) /* current configuration */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) addr = lp8788_iout_addr[cfg->num];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) mask = lp8788_iout_mask[cfg->num];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) val = cfg->iout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return lp8788_update_bits(led->lp, addr, mask, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static int lp8788_led_enable(struct lp8788_led *led,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) enum lp8788_isink_number num, int on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) u8 mask = 1 << num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) u8 val = on << num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) ret = lp8788_update_bits(led->lp, LP8788_ISINK_CTRL, mask, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) if (ret == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) led->on = on;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) static int lp8788_brightness_set(struct led_classdev *led_cdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) enum led_brightness val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) struct lp8788_led *led =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) container_of(led_cdev, struct lp8788_led, led_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) enum lp8788_isink_number num = led->isink_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) int enable, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) mutex_lock(&led->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) switch (num) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) case LP8788_ISINK_1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) case LP8788_ISINK_2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) case LP8788_ISINK_3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) ret = lp8788_write_byte(led->lp, lp8788_pwm_addr[num], val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) mutex_unlock(&led->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) enable = (val > 0) ? 1 : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) if (enable != led->on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) ret = lp8788_led_enable(led, num, enable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) mutex_unlock(&led->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static int lp8788_led_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) struct lp8788_led_platform_data *led_pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct lp8788_led *led;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) led = devm_kzalloc(dev, sizeof(struct lp8788_led), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) if (!led)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) led->lp = lp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) led->led_dev.max_brightness = MAX_BRIGHTNESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) led->led_dev.brightness_set_blocking = lp8788_brightness_set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) led_pdata = lp->pdata ? lp->pdata->led_pdata : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) if (!led_pdata || !led_pdata->name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) led->led_dev.name = DEFAULT_LED_NAME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) led->led_dev.name = led_pdata->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) mutex_init(&led->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) ret = lp8788_led_init_device(led, led_pdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) dev_err(dev, "led init device err: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) ret = devm_led_classdev_register(dev, &led->led_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) dev_err(dev, "led register err: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) static struct platform_driver lp8788_led_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) .probe = lp8788_led_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) .name = LP8788_DEV_KEYLED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) module_platform_driver(lp8788_led_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) MODULE_DESCRIPTION("Texas Instruments LP8788 Keyboard LED Driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) MODULE_AUTHOR("Milo Kim");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) MODULE_ALIAS("platform:lp8788-keyled");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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