]>
git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/misc/pca9551_led.c
2 * Copyright (C) 2015 Stefan Roese <sr@denx.de>
4 * SPDX-License-Identifier: GPL-2.0+
11 #ifndef CONFIG_PCA9551_I2C_ADDR
12 #error "CONFIG_PCA9551_I2C_ADDR not defined!"
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 */
23 #define PCA9551_CTRL_AI (1 << 4) /* Auto-increment flag */
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
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 */
35 static int freq_last
= -1;
36 static int mask_last
= -1;
37 static int idx_last
= -1;
40 static int pca9551_led_get_state(int led
, int *state
)
46 if (led
< 0 || led
> 7) {
49 reg
= PCA9551_REG_LS0
;
52 reg
= PCA9551_REG_LS1
;
53 shift
= (led
- 4) << 1;
56 ret
= i2c_read(CONFIG_PCA9551_I2C_ADDR
, reg
, 1, &buf
, 1);
60 *state
= (buf
>> shift
) & 0x03;
64 static int pca9551_led_set_state(int led
, int state
)
70 if (led
< 0 || led
> 7) {
73 reg
= PCA9551_REG_LS0
;
76 reg
= PCA9551_REG_LS1
;
77 shift
= (led
- 4) << 1;
81 ret
= i2c_read(CONFIG_PCA9551_I2C_ADDR
, reg
, 1, &buf
, 1);
85 buf
= (buf
& ~mask
) | ((state
& 0x03) << shift
);
87 ret
= i2c_write(CONFIG_PCA9551_I2C_ADDR
, reg
, 1, &buf
, 1);
94 static int pca9551_led_set_blink_rate(int idx
, struct pca9551_blink_rate rate
)
101 reg
= PCA9551_REG_PSC0
;
104 reg
= PCA9551_REG_PSC1
;
109 reg
|= PCA9551_CTRL_AI
;
111 ret
= i2c_write(CONFIG_PCA9551_I2C_ADDR
, reg
, 1, (u8
*)&rate
, 2);
119 * Functions referenced by cmd_led.c or status_led.c
121 void __led_init(led_id_t id
, int state
)
125 void __led_set(led_id_t mask
, int state
)
127 if (state
== CONFIG_LED_STATUS_OFF
)
128 pca9551_led_set_state(mask
, PCA9551_LED_STATE_OFF
);
130 pca9551_led_set_state(mask
, PCA9551_LED_STATE_ON
);
133 void __led_toggle(led_id_t mask
)
137 pca9551_led_get_state(mask
, &state
);
138 pca9551_led_set_state(mask
, !state
);
141 void __led_blink(led_id_t mask
, int freq
)
143 struct pca9551_blink_rate rate
;
147 if ((freq
== freq_last
) || (mask
== mask_last
)) {
151 /* Toggle blink index */
154 mode
= PCA9551_LED_STATE_BLINK1
;
157 mode
= PCA9551_LED_STATE_BLINK0
;
166 rate
.psc
= ((freq
* 38) / 1000) - 1;
167 rate
.pwm
= 128; /* 50% duty cycle */
169 pca9551_led_set_blink_rate(idx
, rate
);
170 pca9551_led_set_state(mask
, mode
);