8 unsigned char mode, state;
10 unsigned char probe_steady, mode_changed;
12 uint16_t mode_pwm[N_PWMLED_MODES];
13 int16_t err_sums[N_PWMLED_MODES];
16 pwmled_t pwmleds[N_PWMLEDS];
18 #define SENSE_MOHM 3000 /* 1 Ohm */
20 * Voltage in uV at ADC reading == 1 is 1100/gain/1024
21 * ADC module returns sum of 1 << PWMLED_ADC_SHIFT measurements
22 * Voltage in uV measured is current in mA * sense resistance in mOhm
24 #define MA_GAIN_TO_ADC(ma, gain) ((uint16_t) \
27 * (1 << (PWMLED_ADC_SHIFT)) \
31 static uint16_t adc_max[N_PWMLEDS] = {
32 MA_GAIN_TO_ADC( 30, 1),
33 MA_GAIN_TO_ADC( 30, 1),
36 static uint16_t adc_vals[N_PWMLEDS*N_PWMLED_MODES] = {
38 MA_GAIN_TO_ADC( 2, 1),
39 MA_GAIN_TO_ADC( 5, 1),
40 MA_GAIN_TO_ADC( 10, 1),
41 MA_GAIN_TO_ADC( 20, 1),
43 MA_GAIN_TO_ADC( 2, 1),
44 MA_GAIN_TO_ADC( 8, 1),
45 MA_GAIN_TO_ADC( 14, 1),
46 MA_GAIN_TO_ADC( 20, 1),
53 // The above are constructed so that the following work:
54 #define ST_IS_ON(s) ((s) & 0x02)
55 #define ST_CAN_SET_MODE(s) ((s) & 0x01)
61 for (i = 0; i < N_PWMLEDS; i++) {
62 pwmled_t *led = pwmleds + i;
64 led->target = adc_vals[i*N_PWMLED_MODES];
67 led->state = ST_PROBING;
68 led->probe_steady = 0;
70 for (j = 0; j < N_PWMLED_MODES; j++) {
75 pwmleds[0].state = ST_DISABLED;
78 void pwmled_set_mode(unsigned char n, unsigned char mode)
80 pwmled_t *led = pwmleds + n;
82 if (!ST_CAN_SET_MODE(led->state))
85 if (led->mode) { // save the previous state
86 led->mode_pwm[led->mode - 1] = led->pwm;
87 led->err_sums[led->mode - 1] = led->err_sum;
92 if (mode > 0 && mode <= N_PWMLED_MODES) {
93 led->target = adc_vals[n*N_PWMLED_MODES + mode - 1];
95 led->pwm = led->mode_pwm[mode - 1];
96 led->err_sum = led->err_sums[mode - 1];
97 led->mode_changed = 1;
105 #define PWMLED_PROBE_STEADY_COUNT 10
107 static inline unsigned char pwmled_probed_ok(unsigned char n, uint16_t old_pwm)
109 pwmled_t *led = pwmleds + n;
111 if (led->pwm == old_pwm) {
112 if (led->probe_steady < PWMLED_PROBE_STEADY_COUNT)
115 led->probe_steady = 0;
118 if (led->probe_steady < PWMLED_PROBE_STEADY_COUNT
119 && old_pwm <= led->pwm)
123 led->mode_pwm[led->mode - 1] = led->pwm;
124 led->err_sums[led->mode - 1] = 0;
126 // next mode to probe?
127 if (led->mode < N_PWMLED_MODES) {
128 led->probe_steady = 0;
132 led->target = adc_vals[n*N_PWMLED_MODES+led->mode-1];
143 // log_word(jiffies);
145 for (i = 0; i < N_PWMLED_MODES; i++)
146 log_word(led->mode_pwm[i]);
151 // pwmled_set_mode(n, 2);
157 static inline void pwmled_err(unsigned char n)
159 pwmleds[n].state = ST_DISABLED;
164 // log_word(jiffies);
169 void pwmled_adc(unsigned char n, uint16_t adcval)
171 pwmled_t *led = pwmleds + n;
176 if (!ST_IS_ON(led->state))
179 if (led->state == ST_ON && led->mode_changed) {
183 // FIXME: test for maximum adcval value (adc_max[n])
187 shift = led->state == ST_PROBING ? 3 : 8;
189 sum = ((int32_t)led->pwm << shift)
190 + led->err_sum + led->target - adcval;
195 led->pwm = sum >> shift;
196 sum -= led->pwm << shift;
199 if (led->pwm >= PWM_MAX
200 || (led->pwm > (2*PWM_MAX/3) && adcval < 0x08)) {
205 if (led->state == ST_PROBING)
206 if (pwmled_probed_ok(n, old_pwm))
209 if (led->pwm == old_pwm)