1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2015 Stefan Roese <sr@denx.de>
4 */
5
6 #include <common.h>
7 #include <errno.h>
8 #include <i2c.h>
9
10 #ifndef CONFIG_PCA9551_I2C_ADDR
11 #error "CONFIG_PCA9551_I2C_ADDR not defined!"
12 #endif
13
14 #define PCA9551_REG_INPUT 0x00 /* Input register (read only) */
15 #define PCA9551_REG_PSC0 0x01 /* Frequency prescaler 0 */
16 #define PCA9551_REG_PWM0 0x02 /* PWM0 */
17 #define PCA9551_REG_PSC1 0x03 /* Frequency prescaler 1 */
18 #define PCA9551_REG_PWM1 0x04 /* PWM1 */
19 #define PCA9551_REG_LS0 0x05 /* LED0 to LED3 selector */
20 #define PCA9551_REG_LS1 0x06 /* LED4 to LED7 selector */
21
22 #define PCA9551_CTRL_AI (1 << 4) /* Auto-increment flag */
23
24 #define PCA9551_LED_STATE_ON 0x00
25 #define PCA9551_LED_STATE_OFF 0x01
26 #define PCA9551_LED_STATE_BLINK0 0x02
27 #define PCA9551_LED_STATE_BLINK1 0x03
28
29 struct pca9551_blink_rate {
30 u8 psc; /* Frequency preescaler, see PCA9551_7.pdf p. 6 */
31 u8 pwm; /* Pulse width modulation, see PCA9551_7.pdf p. 6 */
32 };
33
34 static int freq_last = -1;
35 static int mask_last = -1;
36 static int idx_last = -1;
37 static int mode_last;
38
pca9551_led_get_state(int led,int * state)39 static int pca9551_led_get_state(int led, int *state)
40 {
41 unsigned int reg;
42 u8 shift, buf;
43 int ret;
44
45 if (led < 0 || led > 7) {
46 return -EINVAL;
47 } else if (led < 4) {
48 reg = PCA9551_REG_LS0;
49 shift = led << 1;
50 } else {
51 reg = PCA9551_REG_LS1;
52 shift = (led - 4) << 1;
53 }
54
55 ret = i2c_read(CONFIG_PCA9551_I2C_ADDR, reg, 1, &buf, 1);
56 if (ret)
57 return ret;
58
59 *state = (buf >> shift) & 0x03;
60 return 0;
61 }
62
pca9551_led_set_state(int led,int state)63 static int pca9551_led_set_state(int led, int state)
64 {
65 unsigned int reg;
66 u8 shift, buf, mask;
67 int ret;
68
69 if (led < 0 || led > 7) {
70 return -EINVAL;
71 } else if (led < 4) {
72 reg = PCA9551_REG_LS0;
73 shift = led << 1;
74 } else {
75 reg = PCA9551_REG_LS1;
76 shift = (led - 4) << 1;
77 }
78 mask = 0x03 << shift;
79
80 ret = i2c_read(CONFIG_PCA9551_I2C_ADDR, reg, 1, &buf, 1);
81 if (ret)
82 return ret;
83
84 buf = (buf & ~mask) | ((state & 0x03) << shift);
85
86 ret = i2c_write(CONFIG_PCA9551_I2C_ADDR, reg, 1, &buf, 1);
87 if (ret)
88 return ret;
89
90 return 0;
91 }
92
pca9551_led_set_blink_rate(int idx,struct pca9551_blink_rate rate)93 static int pca9551_led_set_blink_rate(int idx, struct pca9551_blink_rate rate)
94 {
95 unsigned int reg;
96 int ret;
97
98 switch (idx) {
99 case 0:
100 reg = PCA9551_REG_PSC0;
101 break;
102 case 1:
103 reg = PCA9551_REG_PSC1;
104 break;
105 default:
106 return -EINVAL;
107 }
108 reg |= PCA9551_CTRL_AI;
109
110 ret = i2c_write(CONFIG_PCA9551_I2C_ADDR, reg, 1, (u8 *)&rate, 2);
111 if (ret)
112 return ret;
113
114 return 0;
115 }
116
117 /*
118 * Functions referenced by cmd_led.c or status_led.c
119 */
__led_init(led_id_t id,int state)120 void __led_init(led_id_t id, int state)
121 {
122 }
123
__led_set(led_id_t mask,int state)124 void __led_set(led_id_t mask, int state)
125 {
126 if (state == CONFIG_LED_STATUS_OFF)
127 pca9551_led_set_state(mask, PCA9551_LED_STATE_OFF);
128 else
129 pca9551_led_set_state(mask, PCA9551_LED_STATE_ON);
130 }
131
__led_toggle(led_id_t mask)132 void __led_toggle(led_id_t mask)
133 {
134 int state = 0;
135
136 pca9551_led_get_state(mask, &state);
137 pca9551_led_set_state(mask, !state);
138 }
139
__led_blink(led_id_t mask,int freq)140 void __led_blink(led_id_t mask, int freq)
141 {
142 struct pca9551_blink_rate rate;
143 int mode;
144 int idx;
145
146 if ((freq == freq_last) || (mask == mask_last)) {
147 idx = idx_last;
148 mode = mode_last;
149 } else {
150 /* Toggle blink index */
151 if (idx_last == 0) {
152 idx = 1;
153 mode = PCA9551_LED_STATE_BLINK1;
154 } else {
155 idx = 0;
156 mode = PCA9551_LED_STATE_BLINK0;
157 }
158
159 idx_last = idx;
160 mode_last = mode;
161 }
162 freq_last = freq;
163 mask_last = mask;
164
165 rate.psc = ((freq * 38) / 1000) - 1;
166 rate.pwm = 128; /* 50% duty cycle */
167
168 pca9551_led_set_blink_rate(idx, rate);
169 pca9551_led_set_state(mask, mode);
170 }
171