jcs.org
Control intel backlight on FreeBSD (and OpenBSD)
openbsd
add suport for gen8/broadwell backlight setting
tested on:
vga1 at pci0 dev 2 function 0 "Intel HD Graphics 5300" rev 0x09
+20
-5
+20
-5
intel_backlight.c
+20
-5
intel_backlight.c
···
69
69
int main(int argc, char** argv)
70
70
{
71
71
uint32_t current, max, min;
72
+
struct pci_device *dev;
72
73
int result;
73
74
74
-
intel_get_mmio(intel_get_pci_device());
75
+
dev = intel_get_pci_device();
76
+
intel_get_mmio(dev);
75
77
76
-
current = reg_read(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
78
+
if (IS_GEN8(dev->device_id)) /* broadwell */
79
+
current = reg_read(BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
80
+
else
81
+
current = reg_read(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
82
+
77
83
max = reg_read(BLC_PWM_PCH_CTL2) >> 16;
78
84
79
85
min = 0.5 + 0.5 * max / 100.0; // 0.5%
···
99
105
v = min;
100
106
else if (v > max)
101
107
v = max;
102
-
reg_write(BLC_PWM_CPU_CTL,
103
-
(reg_read(BLC_PWM_CPU_CTL) &~ BACKLIGHT_DUTY_CYCLE_MASK) | v);
104
-
(void) reg_read(BLC_PWM_CPU_CTL);
108
+
109
+
if (IS_GEN8(dev->device_id)) {
110
+
reg_write(BLC_PWM_PCH_CTL2,
111
+
(reg_read(BLC_PWM_PCH_CTL2) &~
112
+
BACKLIGHT_DUTY_CYCLE_MASK) | v);
113
+
(void) reg_read(BLC_PWM_PCH_CTL2);
114
+
} else {
115
+
reg_write(BLC_PWM_CPU_CTL,
116
+
(reg_read(BLC_PWM_CPU_CTL) &~
117
+
BACKLIGHT_DUTY_CYCLE_MASK) | v);
118
+
(void) reg_read(BLC_PWM_CPU_CTL);
119
+
}
105
120
result = 0.5 + v * 100.0 / max;
106
121
printf ("set backlight to %d%% (%d/%d)\n", result, v, max);
107
122
}