^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Backlight driver for OMAP based boards.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2006 Andrzej Zaborowski <balrog@zabor.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/fb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/backlight.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/platform_data/omap1_bl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <mach/hardware.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <mach/mux.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define OMAPBL_MAX_INTENSITY 0xff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct omap_backlight {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) int powermode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) int current_intensity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct omap_backlight_config *pdata;
^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) static inline void omapbl_send_intensity(int intensity)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) omap_writeb(intensity, OMAP_PWL_ENABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static inline void omapbl_send_enable(int enable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) omap_writeb(enable, OMAP_PWL_CLK_ENABLE);
^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 void omapbl_blank(struct omap_backlight *bl, int mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) if (bl->pdata->set_power)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) bl->pdata->set_power(bl->dev, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) switch (mode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) case FB_BLANK_NORMAL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) case FB_BLANK_VSYNC_SUSPEND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) case FB_BLANK_HSYNC_SUSPEND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) case FB_BLANK_POWERDOWN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) omapbl_send_intensity(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) omapbl_send_enable(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) case FB_BLANK_UNBLANK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) omapbl_send_intensity(bl->current_intensity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) omapbl_send_enable(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #ifdef CONFIG_PM_SLEEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static int omapbl_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct backlight_device *bl_dev = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct omap_backlight *bl = bl_get_data(bl_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) omapbl_blank(bl, FB_BLANK_POWERDOWN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return 0;
^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) static int omapbl_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct backlight_device *bl_dev = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct omap_backlight *bl = bl_get_data(bl_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) omapbl_blank(bl, bl->powermode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static int omapbl_set_power(struct backlight_device *dev, int state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct omap_backlight *bl = bl_get_data(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) omapbl_blank(bl, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) bl->powermode = state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static int omapbl_update_status(struct backlight_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) struct omap_backlight *bl = bl_get_data(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (bl->current_intensity != dev->props.brightness) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (bl->powermode == FB_BLANK_UNBLANK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) omapbl_send_intensity(dev->props.brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) bl->current_intensity = dev->props.brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (dev->props.fb_blank != bl->powermode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) omapbl_set_power(dev, dev->props.fb_blank);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static int omapbl_get_intensity(struct backlight_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) struct omap_backlight *bl = bl_get_data(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return bl->current_intensity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static const struct backlight_ops omapbl_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) .get_brightness = omapbl_get_intensity,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) .update_status = omapbl_update_status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static int omapbl_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) struct backlight_properties props;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) struct backlight_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) struct omap_backlight *bl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) struct omap_backlight_config *pdata = dev_get_platdata(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (!pdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) bl = devm_kzalloc(&pdev->dev, sizeof(struct omap_backlight),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (unlikely(!bl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) memset(&props, 0, sizeof(struct backlight_properties));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) props.type = BACKLIGHT_RAW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) props.max_brightness = OMAPBL_MAX_INTENSITY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) dev = devm_backlight_device_register(&pdev->dev, "omap-bl", &pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) bl, &omapbl_ops, &props);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (IS_ERR(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) return PTR_ERR(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) bl->powermode = FB_BLANK_POWERDOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) bl->current_intensity = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) bl->pdata = pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) bl->dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) platform_set_drvdata(pdev, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) omap_cfg_reg(PWL); /* Conflicts with UART3 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) dev->props.fb_blank = FB_BLANK_UNBLANK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) dev->props.brightness = pdata->default_intensity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) omapbl_update_status(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) dev_info(&pdev->dev, "OMAP LCD backlight initialised\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) static SIMPLE_DEV_PM_OPS(omapbl_pm_ops, omapbl_suspend, omapbl_resume);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static struct platform_driver omapbl_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) .probe = omapbl_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) .name = "omap-bl",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) .pm = &omapbl_pm_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) module_platform_driver(omapbl_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) MODULE_AUTHOR("Andrzej Zaborowski <balrog@zabor.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) MODULE_DESCRIPTION("OMAP LCD Backlight driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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