^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) * Simple PWM based backlight control, board code has to setup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * 1) pin configuration so PWM waveforms can output
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * 2) platform_data being correctly configured
^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/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/gpio/consumer.h>
^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/fb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/backlight.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/pwm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/pwm_backlight.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/regulator/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct pwm_bl_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct pwm_device *pwm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) unsigned int lth_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) unsigned int *levels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) bool enabled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct regulator *power_supply;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct gpio_desc *enable_gpio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) unsigned int scale;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) bool legacy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) unsigned int post_pwm_on_delay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) unsigned int pwm_off_delay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) int (*notify)(struct device *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) int brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) void (*notify_after)(struct device *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) int brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) int (*check_fb)(struct device *, struct fb_info *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) void (*exit)(struct device *);
^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 void pwm_backlight_power_on(struct pwm_bl_data *pb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct pwm_state state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) pwm_get_state(pb->pwm, &state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) if (pb->enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) err = regulator_enable(pb->power_supply);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) dev_err(pb->dev, "failed to enable power supply\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) state.enabled = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) pwm_apply_state(pb->pwm, &state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (pb->post_pwm_on_delay)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) msleep(pb->post_pwm_on_delay);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (pb->enable_gpio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) gpiod_set_value_cansleep(pb->enable_gpio, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) pb->enabled = true;
^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) static void pwm_backlight_power_off(struct pwm_bl_data *pb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) struct pwm_state state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) pwm_get_state(pb->pwm, &state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (!pb->enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (pb->enable_gpio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) gpiod_set_value_cansleep(pb->enable_gpio, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) if (pb->pwm_off_delay)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) msleep(pb->pwm_off_delay);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) state.enabled = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) state.duty_cycle = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) pwm_apply_state(pb->pwm, &state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) regulator_disable(pb->power_supply);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) pb->enabled = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) static int compute_duty_cycle(struct pwm_bl_data *pb, int brightness)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) unsigned int lth = pb->lth_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) struct pwm_state state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) u64 duty_cycle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) pwm_get_state(pb->pwm, &state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (pb->levels)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) duty_cycle = pb->levels[brightness];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) duty_cycle = brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) duty_cycle *= state.period - lth;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) do_div(duty_cycle, pb->scale);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return duty_cycle + lth;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static int pwm_backlight_update_status(struct backlight_device *bl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) struct pwm_bl_data *pb = bl_get_data(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) int brightness = backlight_get_brightness(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct pwm_state state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (pb->notify)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) brightness = pb->notify(pb->dev, brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (brightness > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) pwm_get_state(pb->pwm, &state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) state.duty_cycle = compute_duty_cycle(pb, brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) pwm_apply_state(pb->pwm, &state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) pwm_backlight_power_on(pb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) pwm_backlight_power_off(pb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (pb->notify_after)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) pb->notify_after(pb->dev, brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static int pwm_backlight_check_fb(struct backlight_device *bl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) struct fb_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) struct pwm_bl_data *pb = bl_get_data(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) return !pb->check_fb || pb->check_fb(pb->dev, info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) static const struct backlight_ops pwm_backlight_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) .update_status = pwm_backlight_update_status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) .check_fb = pwm_backlight_check_fb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) #ifdef CONFIG_OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) #define PWM_LUMINANCE_SHIFT 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) #define PWM_LUMINANCE_SCALE (1 << PWM_LUMINANCE_SHIFT) /* luminance scale */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) * CIE lightness to PWM conversion.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) * The CIE 1931 lightness formula is what actually describes how we perceive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) * light:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) * Y = (L* / 903.3) if L* ≤ 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) * Y = ((L* + 16) / 116)^3 if L* > 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) * Where Y is the luminance, the amount of light coming out of the screen, and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) * is a number between 0.0 and 1.0; and L* is the lightness, how bright a human
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) * perceives the screen to be, and is a number between 0 and 100.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) * The following function does the fixed point maths needed to implement the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) * above formula.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) static u64 cie1931(unsigned int lightness)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) u64 retval;
^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) * @lightness is given as a number between 0 and 1, expressed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) * as a fixed-point number in scale
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) * PWM_LUMINANCE_SCALE. Convert to a percentage, still
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) * expressed as a fixed-point number, so the above formulas
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * can be applied.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) lightness *= 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) if (lightness <= (8 * PWM_LUMINANCE_SCALE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) retval = DIV_ROUND_CLOSEST(lightness * 10, 9033);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) retval = (lightness + (16 * PWM_LUMINANCE_SCALE)) / 116;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) retval *= retval * retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) retval += 1ULL << (2*PWM_LUMINANCE_SHIFT - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) retval >>= 2*PWM_LUMINANCE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) * Create a default correction table for PWM values to create linear brightness
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * for LED based backlights using the CIE1931 algorithm.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) int pwm_backlight_brightness_default(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) struct platform_pwm_backlight_data *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) unsigned int period)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) u64 retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) * Once we have 4096 levels there's little point going much higher...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) * neither interactive sliders nor animation benefits from having
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) * more values in the table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) data->max_brightness =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) min((int)DIV_ROUND_UP(period, fls(period)), 4096);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) data->levels = devm_kcalloc(dev, data->max_brightness,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) sizeof(*data->levels), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) if (!data->levels)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) /* Fill the table using the cie1931 algorithm */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) for (i = 0; i < data->max_brightness; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) retval = cie1931((i * PWM_LUMINANCE_SCALE) /
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) data->max_brightness) * period;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) retval = DIV_ROUND_CLOSEST_ULL(retval, PWM_LUMINANCE_SCALE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) if (retval > UINT_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) data->levels[i] = (unsigned int)retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) data->dft_brightness = data->max_brightness / 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) data->max_brightness--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) static int pwm_backlight_parse_dt(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) struct platform_pwm_backlight_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) struct device_node *node = dev->of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) unsigned int num_levels = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) unsigned int levels_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) unsigned int num_steps = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) struct property *prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) unsigned int *table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) int length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) u32 value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) if (!node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) memset(data, 0, sizeof(*data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) * These values are optional and set as 0 by default, the out values
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) * are modified only if a valid u32 value can be decoded.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) of_property_read_u32(node, "post-pwm-on-delay-ms",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) &data->post_pwm_on_delay);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) of_property_read_u32(node, "pwm-off-delay-ms", &data->pwm_off_delay);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) * Determine the number of brightness levels, if this property is not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) * set a default table of brightness levels will be used.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) prop = of_find_property(node, "brightness-levels", &length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) if (!prop)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) data->max_brightness = length / sizeof(u32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) /* read brightness levels from DT property */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) if (data->max_brightness > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) size_t size = sizeof(*data->levels) * data->max_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) unsigned int i, j, n = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) data->levels = devm_kzalloc(dev, size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) if (!data->levels)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) ret = of_property_read_u32_array(node, "brightness-levels",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) data->levels,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) data->max_brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) ret = of_property_read_u32(node, "default-brightness-level",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) &value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) data->dft_brightness = value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) * This property is optional, if is set enables linear
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) * interpolation between each of the values of brightness levels
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) * and creates a new pre-computed table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) of_property_read_u32(node, "num-interpolated-steps",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) &num_steps);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * Make sure that there is at least two entries in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) * brightness-levels table, otherwise we can't interpolate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) * between two points.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) if (num_steps) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) if (data->max_brightness < 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) dev_err(dev, "can't interpolate\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) * Recalculate the number of brightness levels, now
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) * taking in consideration the number of interpolated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) * steps between two levels.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) for (i = 0; i < data->max_brightness - 1; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) if ((data->levels[i + 1] - data->levels[i]) /
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) num_steps)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) num_levels += num_steps;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) num_levels++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) num_levels++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) dev_dbg(dev, "new number of brightness levels: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) num_levels);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) * Create a new table of brightness levels with all the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) * interpolated steps.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) size = sizeof(*table) * num_levels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) table = devm_kzalloc(dev, size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) if (!table)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) /* Fill the interpolated table. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) levels_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) for (i = 0; i < data->max_brightness - 1; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) value = data->levels[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) n = (data->levels[i + 1] - value) / num_steps;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) if (n > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) for (j = 0; j < num_steps; j++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) table[levels_count] = value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) value += n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) levels_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) table[levels_count] = data->levels[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) levels_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) table[levels_count] = data->levels[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) * As we use interpolation lets remove current
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) * brightness levels table and replace for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) * new interpolated table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) devm_kfree(dev, data->levels);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) data->levels = table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) * Reassign max_brightness value to the new total number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) * of brightness levels.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) data->max_brightness = num_levels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) data->max_brightness--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) static const struct of_device_id pwm_backlight_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) { .compatible = "pwm-backlight" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) MODULE_DEVICE_TABLE(of, pwm_backlight_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) static int pwm_backlight_parse_dt(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) struct platform_pwm_backlight_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) static
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) int pwm_backlight_brightness_default(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) struct platform_pwm_backlight_data *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) unsigned int period)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) static bool pwm_backlight_is_linear(struct platform_pwm_backlight_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) unsigned int nlevels = data->max_brightness + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) unsigned int min_val = data->levels[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) unsigned int max_val = data->levels[nlevels - 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) * Multiplying by 128 means that even in pathological cases such
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) * as (max_val - min_val) == nlevels the error at max_val is less
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) * than 1%.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) unsigned int slope = (128 * (max_val - min_val)) / nlevels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) unsigned int margin = (max_val - min_val) / 20; /* 5% */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) for (i = 1; i < nlevels; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) unsigned int linear_value = min_val + ((i * slope) / 128);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) unsigned int delta = abs(linear_value - data->levels[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) if (delta > margin)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) static int pwm_backlight_initial_power_state(const struct pwm_bl_data *pb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) struct device_node *node = pb->dev->of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) bool active = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) * If the enable GPIO is present, observable (either as input
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) * or output) and off then the backlight is not currently active.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) * */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) if (pb->enable_gpio && gpiod_get_value_cansleep(pb->enable_gpio) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) active = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) if (!regulator_is_enabled(pb->power_supply))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) active = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) if (!pwm_is_enabled(pb->pwm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) active = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) * Synchronize the enable_gpio with the observed state of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) * hardware.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) if (pb->enable_gpio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) gpiod_direction_output(pb->enable_gpio, active);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) * Do not change pb->enabled here! pb->enabled essentially
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) * tells us if we own one of the regulator's use counts and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) * right now we do not.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) /* Not booted with device tree or no phandle link to the node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) if (!node || !node->phandle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) return FB_BLANK_UNBLANK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) * If the driver is probed from the device tree and there is a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) * phandle link pointing to the backlight node, it is safe to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) * assume that another driver will enable the backlight at the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) * appropriate time. Therefore, if it is disabled, keep it so.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) return active ? FB_BLANK_UNBLANK: FB_BLANK_POWERDOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) static int pwm_backlight_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) struct platform_pwm_backlight_data *data = dev_get_platdata(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) struct platform_pwm_backlight_data defdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) struct backlight_properties props;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) struct backlight_device *bl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) struct device_node *node = pdev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) struct pwm_bl_data *pb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) struct pwm_state state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) if (!data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) ret = pwm_backlight_parse_dt(&pdev->dev, &defdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) dev_err(&pdev->dev, "failed to find platform data\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) data = &defdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) if (data->init) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) ret = data->init(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) pb = devm_kzalloc(&pdev->dev, sizeof(*pb), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) if (!pb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) goto err_alloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) pb->notify = data->notify;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) pb->notify_after = data->notify_after;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) pb->check_fb = data->check_fb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) pb->exit = data->exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) pb->dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) pb->enabled = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) pb->post_pwm_on_delay = data->post_pwm_on_delay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) pb->pwm_off_delay = data->pwm_off_delay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) pb->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) GPIOD_ASIS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) if (IS_ERR(pb->enable_gpio)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) ret = PTR_ERR(pb->enable_gpio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) goto err_alloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) pb->power_supply = devm_regulator_get(&pdev->dev, "power");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) if (IS_ERR(pb->power_supply)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) ret = PTR_ERR(pb->power_supply);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) goto err_alloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) pb->pwm = devm_pwm_get(&pdev->dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) if (IS_ERR(pb->pwm) && PTR_ERR(pb->pwm) != -EPROBE_DEFER && !node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) dev_err(&pdev->dev, "unable to request PWM, trying legacy API\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) pb->legacy = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) pb->pwm = pwm_request(data->pwm_id, "pwm-backlight");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) if (IS_ERR(pb->pwm)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) ret = PTR_ERR(pb->pwm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) if (ret != -EPROBE_DEFER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) dev_err(&pdev->dev, "unable to request PWM\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) goto err_alloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) dev_dbg(&pdev->dev, "got pwm for backlight\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) /* Sync up PWM state. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) pwm_init_state(pb->pwm, &state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) * The DT case will set the pwm_period_ns field to 0 and store the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) * period, parsed from the DT, in the PWM device. For the non-DT case,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) * set the period from platform data if it has not already been set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) * via the PWM lookup table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) if (!state.period && (data->pwm_period_ns > 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) state.period = data->pwm_period_ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) ret = pwm_apply_state(pb->pwm, &state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) dev_err(&pdev->dev, "failed to apply initial PWM state: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) goto err_alloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) memset(&props, 0, sizeof(struct backlight_properties));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) if (data->levels) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) pb->levels = data->levels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) * For the DT case, only when brightness levels is defined
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) * data->levels is filled. For the non-DT case, data->levels
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) * can come from platform data, however is not usual.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) for (i = 0; i <= data->max_brightness; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) if (data->levels[i] > pb->scale)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) pb->scale = data->levels[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) if (pwm_backlight_is_linear(data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) props.scale = BACKLIGHT_SCALE_LINEAR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) props.scale = BACKLIGHT_SCALE_NON_LINEAR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) } else if (!data->max_brightness) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) * If no brightness levels are provided and max_brightness is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) * not set, use the default brightness table. For the DT case,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) * max_brightness is set to 0 when brightness levels is not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) * specified. For the non-DT case, max_brightness is usually
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) * set to some value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) /* Get the PWM period (in nanoseconds) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) pwm_get_state(pb->pwm, &state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) ret = pwm_backlight_brightness_default(&pdev->dev, data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) state.period);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) dev_err(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) "failed to setup default brightness table\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) goto err_alloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) for (i = 0; i <= data->max_brightness; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) if (data->levels[i] > pb->scale)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) pb->scale = data->levels[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) pb->levels = data->levels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) props.scale = BACKLIGHT_SCALE_NON_LINEAR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) * That only happens for the non-DT case, where platform data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) * sets the max_brightness value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) pb->scale = data->max_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) pwm_adjust_config(pb->pwm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) pb->lth_brightness = data->lth_brightness * (div_u64(state.period,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) pb->scale));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) props.type = BACKLIGHT_RAW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) props.max_brightness = data->max_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) bl = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, pb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) &pwm_backlight_ops, &props);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) if (IS_ERR(bl)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) dev_err(&pdev->dev, "failed to register backlight\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) ret = PTR_ERR(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) if (pb->legacy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) pwm_free(pb->pwm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) goto err_alloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) if (data->dft_brightness > data->max_brightness) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) dev_warn(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) "invalid default brightness level: %u, using %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) data->dft_brightness, data->max_brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) data->dft_brightness = data->max_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) bl->props.brightness = data->dft_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) bl->props.power = pwm_backlight_initial_power_state(pb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) backlight_update_status(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) platform_set_drvdata(pdev, bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) err_alloc:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) if (data->exit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) data->exit(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) static int pwm_backlight_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) struct backlight_device *bl = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) struct pwm_bl_data *pb = bl_get_data(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) backlight_device_unregister(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) pwm_backlight_power_off(pb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) if (pb->exit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) pb->exit(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) if (pb->legacy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) pwm_free(pb->pwm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) static void pwm_backlight_shutdown(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) struct backlight_device *bl = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) struct pwm_bl_data *pb = bl_get_data(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) pwm_backlight_power_off(pb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) #ifdef CONFIG_PM_SLEEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) static int pwm_backlight_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) struct backlight_device *bl = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) struct pwm_bl_data *pb = bl_get_data(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) if (pb->notify)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) pb->notify(pb->dev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) pwm_backlight_power_off(pb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) if (pb->notify_after)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) pb->notify_after(pb->dev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) static int pwm_backlight_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) struct backlight_device *bl = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) backlight_update_status(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) static const struct dev_pm_ops pwm_backlight_pm_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) #ifdef CONFIG_PM_SLEEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) .suspend = pwm_backlight_suspend,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) .resume = pwm_backlight_resume,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) .poweroff = pwm_backlight_suspend,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) .restore = pwm_backlight_resume,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) static struct platform_driver pwm_backlight_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) .name = "pwm-backlight",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) .pm = &pwm_backlight_pm_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) .of_match_table = of_match_ptr(pwm_backlight_of_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) .probe = pwm_backlight_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) .remove = pwm_backlight_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) .shutdown = pwm_backlight_shutdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) module_platform_driver(pwm_backlight_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) MODULE_DESCRIPTION("PWM based Backlight Driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) MODULE_LICENSE("GPL v2");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) MODULE_ALIAS("platform:pwm-backlight");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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