blob: d4034f6735b93d1c098e0b4765158d17cad282ac [file] [log] [blame]
Stefan Roese1cdd9412015-03-12 11:22:46 +01001/*
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
30struct 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
Stefan Roesef5df36d2015-07-06 13:35:55 +020035static int freq_last = -1;
36static int mask_last = -1;
37static int idx_last = -1;
38static int mode_last;
Stefan Roese1cdd9412015-03-12 11:22:46 +010039
40static 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
64static 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
94static 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 */
121void __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
129void __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
137void __led_blink(led_id_t mask, int freq)
138{
139 struct pca9551_blink_rate rate;
140 int mode;
Stefan Roesef5df36d2015-07-06 13:35:55 +0200141 int idx;
Stefan Roese1cdd9412015-03-12 11:22:46 +0100142
Stefan Roesef5df36d2015-07-06 13:35:55 +0200143 if ((freq == freq_last) || (mask == mask_last)) {
144 idx = idx_last;
145 mode = mode_last;
Stefan Roese1cdd9412015-03-12 11:22:46 +0100146 } else {
Stefan Roesef5df36d2015-07-06 13:35:55 +0200147 /* 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;
Stefan Roese1cdd9412015-03-12 11:22:46 +0100158 }
Stefan Roesef5df36d2015-07-06 13:35:55 +0200159 freq_last = freq;
160 mask_last = mask;
Stefan Roese1cdd9412015-03-12 11:22:46 +0100161
162 rate.psc = ((freq * 38) / 1000) - 1;
163 rate.pwm = 128; /* 50% duty cycle */
164
Stefan Roesef5df36d2015-07-06 13:35:55 +0200165 pca9551_led_set_blink_rate(idx, rate);
Stefan Roese1cdd9412015-03-12 11:22:46 +0100166 pca9551_led_set_state(mask, mode);
167}