^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 Kinetic KTD253
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Based on code and know-how from the Samsung GT-S7710
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Gareth Phillips <gareth.phillips@samsung.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/backlight.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/fb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/gpio/consumer.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/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/limits.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/property.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /* Current ratio is n/32 from 1/32 to 32/32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define KTD253_MIN_RATIO 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define KTD253_MAX_RATIO 32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define KTD253_DEFAULT_RATIO 13
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define KTD253_T_LOW_NS (200 + 10) /* Additional 10ns as safety factor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define KTD253_T_HIGH_NS (200 + 10) /* Additional 10ns as safety factor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define KTD253_T_OFF_CRIT_NS 100000 /* 100 us, now it doesn't look good */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define KTD253_T_OFF_MS 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct ktd253_backlight {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct backlight_device *bl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct gpio_desc *gpiod;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) u16 ratio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static void ktd253_backlight_set_max_ratio(struct ktd253_backlight *ktd253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) gpiod_set_value_cansleep(ktd253->gpiod, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) ndelay(KTD253_T_HIGH_NS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) /* We always fall back to this when we power on */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) static int ktd253_backlight_stepdown(struct ktd253_backlight *ktd253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * These GPIO operations absolutely can NOT sleep so no _cansleep
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * suffixes, and no using GPIO expanders on slow buses for this!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * The maximum number of cycles of the loop is 32 so the time taken
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * should nominally be:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * (T_LOW_NS + T_HIGH_NS + loop_time) * 32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * Architectures do not always support ndelay() and we will get a few us
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * instead. If we get to a critical time limit an interrupt has likely
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * occured in the low part of the loop and we need to restart from the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * top so we have the backlight in a known state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) u64 ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) ns = ktime_get_ns();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) gpiod_set_value(ktd253->gpiod, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) ndelay(KTD253_T_LOW_NS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) gpiod_set_value(ktd253->gpiod, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) ns = ktime_get_ns() - ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) if (ns >= KTD253_T_OFF_CRIT_NS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) dev_err(ktd253->dev, "PCM on backlight took too long (%llu ns)\n", ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) ndelay(KTD253_T_HIGH_NS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) static int ktd253_backlight_update_status(struct backlight_device *bl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct ktd253_backlight *ktd253 = bl_get_data(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) int brightness = backlight_get_brightness(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) u16 target_ratio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) u16 current_ratio = ktd253->ratio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) dev_dbg(ktd253->dev, "new brightness/ratio: %d/32\n", brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) target_ratio = brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if (target_ratio == current_ratio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) /* This is already right */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (target_ratio == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) gpiod_set_value_cansleep(ktd253->gpiod, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * We need to keep the GPIO low for at least this long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * to actually switch the KTD253 off.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) msleep(KTD253_T_OFF_MS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) ktd253->ratio = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (current_ratio == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) ktd253_backlight_set_max_ratio(ktd253);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) current_ratio = KTD253_MAX_RATIO;
^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) while (current_ratio != target_ratio) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) * These GPIO operations absolutely can NOT sleep so no
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * _cansleep suffixes, and no using GPIO expanders on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) * slow buses for this!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) ret = ktd253_backlight_stepdown(ktd253);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (ret == -EAGAIN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) * Something disturbed the backlight setting code when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * running so we need to bring the PWM back to a known
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * state. This shouldn't happen too much.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) gpiod_set_value_cansleep(ktd253->gpiod, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) msleep(KTD253_T_OFF_MS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) ktd253_backlight_set_max_ratio(ktd253);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) current_ratio = KTD253_MAX_RATIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) } else if (current_ratio == KTD253_MIN_RATIO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /* After 1/32 we loop back to 32/32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) current_ratio = KTD253_MAX_RATIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) current_ratio--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) ktd253->ratio = current_ratio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) dev_dbg(ktd253->dev, "new ratio set to %d/32\n", target_ratio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static const struct backlight_ops ktd253_backlight_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) .options = BL_CORE_SUSPENDRESUME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) .update_status = ktd253_backlight_update_status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) static int ktd253_backlight_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) struct backlight_device *bl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) struct ktd253_backlight *ktd253;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) u32 max_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) u32 brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) ktd253 = devm_kzalloc(dev, sizeof(*ktd253), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (!ktd253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) ktd253->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) ret = device_property_read_u32(dev, "max-brightness", &max_brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) max_brightness = KTD253_MAX_RATIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) if (max_brightness > KTD253_MAX_RATIO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /* Clamp brightness to hardware max */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) dev_err(dev, "illegal max brightness specified\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) max_brightness = KTD253_MAX_RATIO;
^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) ret = device_property_read_u32(dev, "default-brightness", &brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) brightness = KTD253_DEFAULT_RATIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) if (brightness > max_brightness) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) /* Clamp default brightness to max brightness */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) dev_err(dev, "default brightness exceeds max brightness\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) brightness = max_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) if (brightness)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) /* This will be the default ratio when the KTD253 is enabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) ktd253->ratio = KTD253_MAX_RATIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) ktd253->ratio = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) ktd253->gpiod = devm_gpiod_get(dev, "enable",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) brightness ? GPIOD_OUT_HIGH :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) GPIOD_OUT_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if (IS_ERR(ktd253->gpiod)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) ret = PTR_ERR(ktd253->gpiod);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) if (ret != -EPROBE_DEFER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) dev_err(dev, "gpio line missing or invalid.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) gpiod_set_consumer_name(ktd253->gpiod, dev_name(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) bl = devm_backlight_device_register(dev, dev_name(dev), dev, ktd253,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) &ktd253_backlight_ops, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) if (IS_ERR(bl)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) dev_err(dev, "failed to register backlight\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) return PTR_ERR(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) bl->props.max_brightness = max_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) /* When we just enable the GPIO line we set max brightness */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) if (brightness) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) bl->props.brightness = brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) bl->props.power = FB_BLANK_UNBLANK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) bl->props.brightness = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) bl->props.power = FB_BLANK_POWERDOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) ktd253->bl = bl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) platform_set_drvdata(pdev, bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) backlight_update_status(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) static const struct of_device_id ktd253_backlight_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) { .compatible = "kinetic,ktd253" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) { /* sentinel */ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) MODULE_DEVICE_TABLE(of, ktd253_backlight_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) static struct platform_driver ktd253_backlight_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) .name = "ktd253-backlight",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) .of_match_table = ktd253_backlight_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) .probe = ktd253_backlight_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) module_platform_driver(ktd253_backlight_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) MODULE_DESCRIPTION("Kinetic KTD253 Backlight Driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) MODULE_ALIAS("platform:ktd253-backlight");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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