^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 the KB3886 Backlight
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2007-2008 Claudio Nieder
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Based on corgi_bl.c by Richard Purdie and kb3886 driver by Robert Woerle
^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/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/init.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/mutex.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/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/dmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define KB3886_PARENT 0x64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define KB3886_IO 0x60
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define KB3886_ADC_DAC_PWM 0xC4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define KB3886_PWM0_WRITE 0x81
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define KB3886_PWM0_READ 0x41
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static DEFINE_MUTEX(bl_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static void kb3886_bl_set_intensity(int intensity)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) mutex_lock(&bl_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) intensity = intensity&0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) outb(KB3886_ADC_DAC_PWM, KB3886_PARENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) usleep_range(10000, 11000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) outb(KB3886_PWM0_WRITE, KB3886_IO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) usleep_range(10000, 11000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) outb(intensity, KB3886_IO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) mutex_unlock(&bl_mutex);
^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) struct kb3886bl_machinfo {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) int max_intensity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) int default_intensity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) int limit_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) void (*set_bl_intensity)(int intensity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static struct kb3886bl_machinfo kb3886_bl_machinfo = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) .max_intensity = 0xff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) .default_intensity = 0xa0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) .limit_mask = 0x7f,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) .set_bl_intensity = kb3886_bl_set_intensity,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static struct platform_device kb3886bl_device = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) .name = "kb3886-bl",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) .dev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) .platform_data = &kb3886_bl_machinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) .id = -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static struct platform_device *devices[] __initdata = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) &kb3886bl_device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * Back to driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) static int kb3886bl_intensity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static struct backlight_device *kb3886_backlight_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static struct kb3886bl_machinfo *bl_machinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static unsigned long kb3886bl_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) #define KB3886BL_SUSPENDED 0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) static const struct dmi_system_id kb3886bl_device_table[] __initconst = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) .ident = "Sahara Touch-iT",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) .matches = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) DMI_MATCH(DMI_SYS_VENDOR, "SDV"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) DMI_MATCH(DMI_PRODUCT_NAME, "iTouch T201"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) { }
^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 kb3886bl_send_intensity(struct backlight_device *bd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) int intensity = backlight_get_brightness(bd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (kb3886bl_flags & KB3886BL_SUSPENDED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) intensity = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) bl_machinfo->set_bl_intensity(intensity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) kb3886bl_intensity = intensity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return 0;
^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) #ifdef CONFIG_PM_SLEEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static int kb3886bl_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) struct backlight_device *bd = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) kb3886bl_flags |= KB3886BL_SUSPENDED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) backlight_update_status(bd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static int kb3886bl_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) struct backlight_device *bd = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) kb3886bl_flags &= ~KB3886BL_SUSPENDED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) backlight_update_status(bd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) static SIMPLE_DEV_PM_OPS(kb3886bl_pm_ops, kb3886bl_suspend, kb3886bl_resume);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static int kb3886bl_get_intensity(struct backlight_device *bd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return kb3886bl_intensity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static const struct backlight_ops kb3886bl_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) .get_brightness = kb3886bl_get_intensity,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) .update_status = kb3886bl_send_intensity,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) static int kb3886bl_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) struct backlight_properties props;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) struct kb3886bl_machinfo *machinfo = dev_get_platdata(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) bl_machinfo = machinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (!machinfo->limit_mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) machinfo->limit_mask = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) memset(&props, 0, sizeof(struct backlight_properties));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) props.type = BACKLIGHT_RAW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) props.max_brightness = machinfo->max_intensity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) kb3886_backlight_device = devm_backlight_device_register(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) "kb3886-bl", &pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) NULL, &kb3886bl_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) &props);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (IS_ERR(kb3886_backlight_device))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return PTR_ERR(kb3886_backlight_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) platform_set_drvdata(pdev, kb3886_backlight_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) kb3886_backlight_device->props.power = FB_BLANK_UNBLANK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) kb3886_backlight_device->props.brightness = machinfo->default_intensity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) backlight_update_status(kb3886_backlight_device);
^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 struct platform_driver kb3886bl_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) .probe = kb3886bl_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) .name = "kb3886-bl",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) .pm = &kb3886bl_pm_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static int __init kb3886_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if (!dmi_check_system(kb3886bl_device_table))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) platform_add_devices(devices, ARRAY_SIZE(devices));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) return platform_driver_register(&kb3886bl_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) static void __exit kb3886_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) platform_driver_unregister(&kb3886bl_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) module_init(kb3886_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) module_exit(kb3886_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) MODULE_AUTHOR("Claudio Nieder <private@claudio.ch>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) MODULE_DESCRIPTION("Tabletkiosk Sahara Touch-iT Backlight Driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) MODULE_ALIAS("dmi:*:svnSDV:pniTouchT201:*");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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