172 lines
3.4 KiB
C
172 lines
3.4 KiB
C
/*
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* Copyright (C) 2015 Stefan Roese <sr@denx.de>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <errno.h>
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#include <i2c.h>
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#ifndef CONFIG_PCA9551_I2C_ADDR
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#error "CONFIG_PCA9551_I2C_ADDR not defined!"
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#endif
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#define PCA9551_REG_INPUT 0x00 /* Input register (read only) */
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#define PCA9551_REG_PSC0 0x01 /* Frequency prescaler 0 */
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#define PCA9551_REG_PWM0 0x02 /* PWM0 */
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#define PCA9551_REG_PSC1 0x03 /* Frequency prescaler 1 */
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#define PCA9551_REG_PWM1 0x04 /* PWM1 */
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#define PCA9551_REG_LS0 0x05 /* LED0 to LED3 selector */
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#define PCA9551_REG_LS1 0x06 /* LED4 to LED7 selector */
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#define PCA9551_CTRL_AI (1 << 4) /* Auto-increment flag */
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#define PCA9551_LED_STATE_ON 0x00
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#define PCA9551_LED_STATE_OFF 0x01
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#define PCA9551_LED_STATE_BLINK0 0x02
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#define PCA9551_LED_STATE_BLINK1 0x03
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struct pca9551_blink_rate {
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u8 psc; /* Frequency preescaler, see PCA9551_7.pdf p. 6 */
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u8 pwm; /* Pulse width modulation, see PCA9551_7.pdf p. 6 */
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};
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static int freq_last = -1;
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static int mask_last = -1;
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static int idx_last = -1;
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static int mode_last;
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static int pca9551_led_get_state(int led, int *state)
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{
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unsigned int reg;
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u8 shift, buf;
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int ret;
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if (led < 0 || led > 7) {
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return -EINVAL;
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} else if (led < 4) {
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reg = PCA9551_REG_LS0;
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shift = led << 1;
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} else {
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reg = PCA9551_REG_LS1;
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shift = (led - 4) << 1;
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}
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ret = i2c_read(CONFIG_PCA9551_I2C_ADDR, reg, 1, &buf, 1);
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if (ret)
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return ret;
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*state = (buf >> shift) & 0x03;
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return 0;
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}
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static int pca9551_led_set_state(int led, int state)
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{
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unsigned int reg;
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u8 shift, buf, mask;
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int ret;
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if (led < 0 || led > 7) {
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return -EINVAL;
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} else if (led < 4) {
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reg = PCA9551_REG_LS0;
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shift = led << 1;
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} else {
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reg = PCA9551_REG_LS1;
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shift = (led - 4) << 1;
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}
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mask = 0x03 << shift;
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ret = i2c_read(CONFIG_PCA9551_I2C_ADDR, reg, 1, &buf, 1);
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if (ret)
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return ret;
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buf = (buf & ~mask) | ((state & 0x03) << shift);
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ret = i2c_write(CONFIG_PCA9551_I2C_ADDR, reg, 1, &buf, 1);
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if (ret)
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return ret;
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return 0;
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}
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static int pca9551_led_set_blink_rate(int idx, struct pca9551_blink_rate rate)
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{
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unsigned int reg;
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int ret;
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switch (idx) {
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case 0:
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reg = PCA9551_REG_PSC0;
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break;
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case 1:
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reg = PCA9551_REG_PSC1;
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break;
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default:
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return -EINVAL;
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}
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reg |= PCA9551_CTRL_AI;
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ret = i2c_write(CONFIG_PCA9551_I2C_ADDR, reg, 1, (u8 *)&rate, 2);
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if (ret)
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return ret;
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return 0;
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}
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/*
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* Functions referenced by cmd_led.c or status_led.c
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*/
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void __led_init(led_id_t id, int state)
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{
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}
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void __led_set(led_id_t mask, int state)
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{
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if (state == STATUS_LED_OFF)
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pca9551_led_set_state(mask, PCA9551_LED_STATE_OFF);
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else
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pca9551_led_set_state(mask, PCA9551_LED_STATE_ON);
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}
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void __led_toggle(led_id_t mask)
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{
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int state = 0;
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pca9551_led_get_state(mask, &state);
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pca9551_led_set_state(mask, !state);
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}
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void __led_blink(led_id_t mask, int freq)
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{
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struct pca9551_blink_rate rate;
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int mode;
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int idx;
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if ((freq == freq_last) || (mask == mask_last)) {
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idx = idx_last;
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mode = mode_last;
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} else {
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/* Toggle blink index */
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if (idx_last == 0) {
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idx = 1;
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mode = PCA9551_LED_STATE_BLINK1;
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} else {
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idx = 0;
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mode = PCA9551_LED_STATE_BLINK0;
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}
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idx_last = idx;
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mode_last = mode;
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}
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freq_last = freq;
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mask_last = mask;
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rate.psc = ((freq * 38) / 1000) - 1;
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rate.pwm = 128; /* 50% duty cycle */
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pca9551_led_set_blink_rate(idx, rate);
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pca9551_led_set_state(mask, mode);
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}
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