1 /* 2 * Copyright (C) 2015 Stefan Roese <sr@denx.de> 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <errno.h> 9 #include <i2c.h> 10 11 #ifndef CONFIG_PCA9551_I2C_ADDR 12 #error "CONFIG_PCA9551_I2C_ADDR not defined!" 13 #endif 14 15 #define PCA9551_REG_INPUT 0x00 /* Input register (read only) */ 16 #define PCA9551_REG_PSC0 0x01 /* Frequency prescaler 0 */ 17 #define PCA9551_REG_PWM0 0x02 /* PWM0 */ 18 #define PCA9551_REG_PSC1 0x03 /* Frequency prescaler 1 */ 19 #define PCA9551_REG_PWM1 0x04 /* PWM1 */ 20 #define PCA9551_REG_LS0 0x05 /* LED0 to LED3 selector */ 21 #define PCA9551_REG_LS1 0x06 /* LED4 to LED7 selector */ 22 23 #define PCA9551_CTRL_AI (1 << 4) /* Auto-increment flag */ 24 25 #define PCA9551_LED_STATE_ON 0x00 26 #define PCA9551_LED_STATE_OFF 0x01 27 #define PCA9551_LED_STATE_BLINK0 0x02 28 #define PCA9551_LED_STATE_BLINK1 0x03 29 30 struct pca9551_blink_rate { 31 u8 psc; /* Frequency preescaler, see PCA9551_7.pdf p. 6 */ 32 u8 pwm; /* Pulse width modulation, see PCA9551_7.pdf p. 6 */ 33 }; 34 35 static int freq_last = -1; 36 static int mask_last = -1; 37 static int idx_last = -1; 38 static int mode_last; 39 40 static int pca9551_led_get_state(int led, int *state) 41 { 42 unsigned int reg; 43 u8 shift, buf; 44 int ret; 45 46 if (led < 0 || led > 7) { 47 return -EINVAL; 48 } else if (led < 4) { 49 reg = PCA9551_REG_LS0; 50 shift = led << 1; 51 } else { 52 reg = PCA9551_REG_LS1; 53 shift = (led - 4) << 1; 54 } 55 56 ret = i2c_read(CONFIG_PCA9551_I2C_ADDR, reg, 1, &buf, 1); 57 if (ret) 58 return ret; 59 60 *state = (buf >> shift) & 0x03; 61 return 0; 62 } 63 64 static int pca9551_led_set_state(int led, int state) 65 { 66 unsigned int reg; 67 u8 shift, buf, mask; 68 int ret; 69 70 if (led < 0 || led > 7) { 71 return -EINVAL; 72 } else if (led < 4) { 73 reg = PCA9551_REG_LS0; 74 shift = led << 1; 75 } else { 76 reg = PCA9551_REG_LS1; 77 shift = (led - 4) << 1; 78 } 79 mask = 0x03 << shift; 80 81 ret = i2c_read(CONFIG_PCA9551_I2C_ADDR, reg, 1, &buf, 1); 82 if (ret) 83 return ret; 84 85 buf = (buf & ~mask) | ((state & 0x03) << shift); 86 87 ret = i2c_write(CONFIG_PCA9551_I2C_ADDR, reg, 1, &buf, 1); 88 if (ret) 89 return ret; 90 91 return 0; 92 } 93 94 static int pca9551_led_set_blink_rate(int idx, struct pca9551_blink_rate rate) 95 { 96 unsigned int reg; 97 int ret; 98 99 switch (idx) { 100 case 0: 101 reg = PCA9551_REG_PSC0; 102 break; 103 case 1: 104 reg = PCA9551_REG_PSC1; 105 break; 106 default: 107 return -EINVAL; 108 } 109 reg |= PCA9551_CTRL_AI; 110 111 ret = i2c_write(CONFIG_PCA9551_I2C_ADDR, reg, 1, (u8 *)&rate, 2); 112 if (ret) 113 return ret; 114 115 return 0; 116 } 117 118 /* 119 * Functions referenced by cmd_led.c 120 */ 121 void __led_set(led_id_t mask, int state) 122 { 123 if (state == STATUS_LED_OFF) 124 pca9551_led_set_state(mask, PCA9551_LED_STATE_OFF); 125 else 126 pca9551_led_set_state(mask, PCA9551_LED_STATE_ON); 127 } 128 129 void __led_toggle(led_id_t mask) 130 { 131 int state = 0; 132 133 pca9551_led_get_state(mask, &state); 134 pca9551_led_set_state(mask, !state); 135 } 136 137 void __led_blink(led_id_t mask, int freq) 138 { 139 struct pca9551_blink_rate rate; 140 int mode; 141 int idx; 142 143 if ((freq == freq_last) || (mask == mask_last)) { 144 idx = idx_last; 145 mode = mode_last; 146 } else { 147 /* Toggle blink index */ 148 if (idx_last == 0) { 149 idx = 1; 150 mode = PCA9551_LED_STATE_BLINK1; 151 } else { 152 idx = 0; 153 mode = PCA9551_LED_STATE_BLINK0; 154 } 155 156 idx_last = idx; 157 mode_last = mode; 158 } 159 freq_last = freq; 160 mask_last = mask; 161 162 rate.psc = ((freq * 38) / 1000) - 1; 163 rate.pwm = 128; /* 50% duty cycle */ 164 165 pca9551_led_set_blink_rate(idx, rate); 166 pca9551_led_set_state(mask, mode); 167 } 168