^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) * Backlight driver for Dialog Semiconductor DA9030/DA9034
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2008 Compulab, Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Mike Rapoport <mike@compulab.co.il>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (C) 2006-2008 Marvell International Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Eric Miao <eric.miao@marvell.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/fb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/backlight.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/mfd/da903x.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define DA9030_WLED_CONTROL 0x25
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define DA9030_WLED_CP_EN (1 << 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define DA9030_WLED_TRIM(x) ((x) & 0x7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define DA9034_WLED_CONTROL1 0x3C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define DA9034_WLED_CONTROL2 0x3D
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define DA9034_WLED_ISET(x) ((x) & 0x1f)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define DA9034_WLED_BOOST_EN (1 << 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define DA9030_MAX_BRIGHTNESS 7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define DA9034_MAX_BRIGHTNESS 0x7f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct da903x_backlight_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct device *da903x_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) int id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) int current_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) static int da903x_backlight_set(struct backlight_device *bl, int brightness)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct da903x_backlight_data *data = bl_get_data(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) struct device *dev = data->da903x_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) uint8_t val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) switch (data->id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) case DA9034_ID_WLED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) ret = da903x_update(dev, DA9034_WLED_CONTROL1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) brightness, 0x7f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (data->current_brightness && brightness == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) ret = da903x_clr_bits(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) DA9034_WLED_CONTROL2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) DA9034_WLED_BOOST_EN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if (data->current_brightness == 0 && brightness)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) ret = da903x_set_bits(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) DA9034_WLED_CONTROL2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) DA9034_WLED_BOOST_EN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) case DA9030_ID_WLED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) val = DA9030_WLED_TRIM(brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) val |= brightness ? DA9030_WLED_CP_EN : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) ret = da903x_write(dev, DA9030_WLED_CONTROL, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) data->current_brightness = brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) static int da903x_backlight_update_status(struct backlight_device *bl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return da903x_backlight_set(bl, backlight_get_brightness(bl));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static int da903x_backlight_get_brightness(struct backlight_device *bl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct da903x_backlight_data *data = bl_get_data(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return data->current_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) static const struct backlight_ops da903x_backlight_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) .options = BL_CORE_SUSPENDRESUME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) .update_status = da903x_backlight_update_status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) .get_brightness = da903x_backlight_get_brightness,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) static int da903x_backlight_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) struct da9034_backlight_pdata *pdata = dev_get_platdata(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) struct da903x_backlight_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) struct backlight_device *bl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) struct backlight_properties props;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) int max_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (data == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) switch (pdev->id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) case DA9030_ID_WLED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) max_brightness = DA9030_MAX_BRIGHTNESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) case DA9034_ID_WLED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) max_brightness = DA9034_MAX_BRIGHTNESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) dev_err(&pdev->dev, "invalid backlight device ID(%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) pdev->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) data->id = pdev->id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) data->da903x_dev = pdev->dev.parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) data->current_brightness = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /* adjust the WLED output current */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (pdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) da903x_write(data->da903x_dev, DA9034_WLED_CONTROL2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) DA9034_WLED_ISET(pdata->output_current));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) memset(&props, 0, sizeof(props));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) props.type = BACKLIGHT_RAW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) props.max_brightness = max_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) bl = devm_backlight_device_register(&pdev->dev, pdev->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) data->da903x_dev, data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) &da903x_backlight_ops, &props);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (IS_ERR(bl)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) dev_err(&pdev->dev, "failed to register backlight\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return PTR_ERR(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) bl->props.brightness = max_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) platform_set_drvdata(pdev, bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) backlight_update_status(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) static struct platform_driver da903x_backlight_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) .name = "da903x-backlight",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) .probe = da903x_backlight_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) module_platform_driver(da903x_backlight_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) MODULE_DESCRIPTION("Backlight Driver for Dialog Semiconductor DA9030/DA9034");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) MODULE_ALIAS("platform:da903x-backlight");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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