diff options
Diffstat (limited to 'roms/u-boot/drivers/misc/pca9551_led.c')
| -rw-r--r-- | roms/u-boot/drivers/misc/pca9551_led.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/misc/pca9551_led.c b/roms/u-boot/drivers/misc/pca9551_led.c new file mode 100644 index 000000000..cdc4390f8 --- /dev/null +++ b/roms/u-boot/drivers/misc/pca9551_led.c @@ -0,0 +1,171 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2015 Stefan Roese <sr@denx.de> + */ + +#include <common.h> +#include <errno.h> +#include <i2c.h> +#include <status_led.h> + +#ifndef CONFIG_PCA9551_I2C_ADDR +#error "CONFIG_PCA9551_I2C_ADDR not defined!" +#endif + +#define PCA9551_REG_INPUT 0x00 /* Input register (read only) */ +#define PCA9551_REG_PSC0 0x01 /* Frequency prescaler 0 */ +#define PCA9551_REG_PWM0 0x02 /* PWM0 */ +#define PCA9551_REG_PSC1 0x03 /* Frequency prescaler 1 */ +#define PCA9551_REG_PWM1 0x04 /* PWM1 */ +#define PCA9551_REG_LS0 0x05 /* LED0 to LED3 selector */ +#define PCA9551_REG_LS1 0x06 /* LED4 to LED7 selector */ + +#define PCA9551_CTRL_AI (1 << 4) /* Auto-increment flag */ + +#define PCA9551_LED_STATE_ON 0x00 +#define PCA9551_LED_STATE_OFF 0x01 +#define PCA9551_LED_STATE_BLINK0 0x02 +#define PCA9551_LED_STATE_BLINK1 0x03 + +struct pca9551_blink_rate { + u8 psc; /* Frequency preescaler, see PCA9551_7.pdf p. 6 */ + u8 pwm; /* Pulse width modulation, see PCA9551_7.pdf p. 6 */ +}; + +static int freq_last = -1; +static int mask_last = -1; +static int idx_last = -1; +static int mode_last; + +static int pca9551_led_get_state(int led, int *state) +{ + unsigned int reg; + u8 shift, buf; + int ret; + + if (led < 0 || led > 7) { + return -EINVAL; + } else if (led < 4) { + reg = PCA9551_REG_LS0; + shift = led << 1; + } else { + reg = PCA9551_REG_LS1; + shift = (led - 4) << 1; + } + + ret = i2c_read(CONFIG_PCA9551_I2C_ADDR, reg, 1, &buf, 1); + if (ret) + return ret; + + *state = (buf >> shift) & 0x03; + return 0; +} + +static int pca9551_led_set_state(int led, int state) +{ + unsigned int reg; + u8 shift, buf, mask; + int ret; + + if (led < 0 || led > 7) { + return -EINVAL; + } else if (led < 4) { + reg = PCA9551_REG_LS0; + shift = led << 1; + } else { + reg = PCA9551_REG_LS1; + shift = (led - 4) << 1; + } + mask = 0x03 << shift; + + ret = i2c_read(CONFIG_PCA9551_I2C_ADDR, reg, 1, &buf, 1); + if (ret) + return ret; + + buf = (buf & ~mask) | ((state & 0x03) << shift); + + ret = i2c_write(CONFIG_PCA9551_I2C_ADDR, reg, 1, &buf, 1); + if (ret) + return ret; + + return 0; +} + +static int pca9551_led_set_blink_rate(int idx, struct pca9551_blink_rate rate) +{ + unsigned int reg; + int ret; + + switch (idx) { + case 0: + reg = PCA9551_REG_PSC0; + break; + case 1: + reg = PCA9551_REG_PSC1; + break; + default: + return -EINVAL; + } + reg |= PCA9551_CTRL_AI; + + ret = i2c_write(CONFIG_PCA9551_I2C_ADDR, reg, 1, (u8 *)&rate, 2); + if (ret) + return ret; + + return 0; +} + +/* + * Functions referenced by cmd_led.c or status_led.c + */ +void __led_init(led_id_t id, int state) +{ +} + +void __led_set(led_id_t mask, int state) +{ + if (state == CONFIG_LED_STATUS_OFF) + pca9551_led_set_state(mask, PCA9551_LED_STATE_OFF); + else + pca9551_led_set_state(mask, PCA9551_LED_STATE_ON); +} + +void __led_toggle(led_id_t mask) +{ + int state = 0; + + pca9551_led_get_state(mask, &state); + pca9551_led_set_state(mask, !state); +} + +void __led_blink(led_id_t mask, int freq) +{ + struct pca9551_blink_rate rate; + int mode; + int idx; + + if ((freq == freq_last) || (mask == mask_last)) { + idx = idx_last; + mode = mode_last; + } else { + /* Toggle blink index */ + if (idx_last == 0) { + idx = 1; + mode = PCA9551_LED_STATE_BLINK1; + } else { + idx = 0; + mode = PCA9551_LED_STATE_BLINK0; + } + + idx_last = idx; + mode_last = mode; + } + freq_last = freq; + mask_last = mask; + + rate.psc = ((freq * 38) / 1000) - 1; + rate.pwm = 128; /* 50% duty cycle */ + + pca9551_led_set_blink_rate(idx, rate); + pca9551_led_set_state(mask, mode); +} |