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u-boot/drivers/gpio/pca953x.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2008 Extreme Engineering Solutions, Inc.
*/
/*
* Driver for NXP's 4, 8 and 16 bit I2C gpio expanders (eg pca9537, pca9557,
* pca9539, etc)
*/
#include <common.h>
#include <i2c.h>
#include <pca953x.h>
/* Default to an address that hopefully won't corrupt other i2c devices */
#ifndef CONFIG_SYS_I2C_PCA953X_ADDR
#define CONFIG_SYS_I2C_PCA953X_ADDR (~0)
#endif
enum {
PCA953X_CMD_INFO,
PCA953X_CMD_DEVICE,
PCA953X_CMD_OUTPUT,
PCA953X_CMD_INPUT,
PCA953X_CMD_INVERT,
};
#ifdef CONFIG_SYS_I2C_PCA953X_WIDTH
struct pca953x_chip_ngpio {
uint8_t chip;
uint8_t ngpio;
};
static struct pca953x_chip_ngpio pca953x_chip_ngpios[] =
CONFIG_SYS_I2C_PCA953X_WIDTH;
/*
* Determine the number of GPIO pins supported. If we don't know we assume
* 8 pins.
*/
static int pca953x_ngpio(uint8_t chip)
{
int i;
for (i = 0; i < ARRAY_SIZE(pca953x_chip_ngpios); i++)
if (pca953x_chip_ngpios[i].chip == chip)
return pca953x_chip_ngpios[i].ngpio;
return 8;
}
#else
static int pca953x_ngpio(uint8_t chip)
{
return 8;
}
#endif
/*
* Modify masked bits in register
*/
static int pca953x_reg_write(uint8_t chip, uint addr, uint mask, uint data)
{
uint8_t valb;
uint16_t valw;
if (pca953x_ngpio(chip) <= 8) {
if (i2c_read(chip, addr, 1, &valb, 1))
return -1;
valb &= ~mask;
valb |= data;
return i2c_write(chip, addr, 1, &valb, 1);
} else {
if (i2c_read(chip, addr << 1, 1, (u8*)&valw, 2))
return -1;
valw = le16_to_cpu(valw);
valw &= ~mask;
valw |= data;
valw = cpu_to_le16(valw);
return i2c_write(chip, addr << 1, 1, (u8*)&valw, 2);
}
}
static int pca953x_reg_read(uint8_t chip, uint addr, uint *data)
{
uint8_t valb;
uint16_t valw;
if (pca953x_ngpio(chip) <= 8) {
if (i2c_read(chip, addr, 1, &valb, 1))
return -1;
*data = (int)valb;
} else {
if (i2c_read(chip, addr << 1, 1, (u8*)&valw, 2))
return -1;
*data = (uint)le16_to_cpu(valw);
}
return 0;
}
/*
* Set output value of IO pins in 'mask' to corresponding value in 'data'
* 0 = low, 1 = high
*/
int pca953x_set_val(uint8_t chip, uint mask, uint data)
{
return pca953x_reg_write(chip, PCA953X_OUT, mask, data);
}
/*
* Set read polarity of IO pins in 'mask' to corresponding value in 'data'
* 0 = read pin value, 1 = read inverted pin value
*/
int pca953x_set_pol(uint8_t chip, uint mask, uint data)
{
return pca953x_reg_write(chip, PCA953X_POL, mask, data);
}
/*
* Set direction of IO pins in 'mask' to corresponding value in 'data'
* 0 = output, 1 = input
*/
int pca953x_set_dir(uint8_t chip, uint mask, uint data)
{
return pca953x_reg_write(chip, PCA953X_CONF, mask, data);
}
/*
* Read current logic level of all IO pins
*/
int pca953x_get_val(uint8_t chip)
{
uint val;
if (pca953x_reg_read(chip, PCA953X_IN, &val) < 0)
return -1;
return (int)val;
}
#if defined(CONFIG_CMD_PCA953X) && !defined(CONFIG_SPL_BUILD)
/*
* Display pca953x information
*/
static int pca953x_info(uint8_t chip)
{
int i;
uint data;
int nr_gpio = pca953x_ngpio(chip);
int msb = nr_gpio - 1;
printf("pca953x@ 0x%x (%d pins):\n\n", chip, nr_gpio);
printf("gpio pins: ");
for (i = msb; i >= 0; i--)
printf("%x", i);
printf("\n");
for (i = 11 + nr_gpio; i > 0; i--)
printf("-");
printf("\n");
if (pca953x_reg_read(chip, PCA953X_CONF, &data) < 0)
return -1;
printf("conf: ");
for (i = msb; i >= 0; i--)
printf("%c", data & (1 << i) ? 'i' : 'o');
printf("\n");
if (pca953x_reg_read(chip, PCA953X_POL, &data) < 0)
return -1;
printf("invert: ");
for (i = msb; i >= 0; i--)
printf("%c", data & (1 << i) ? '1' : '0');
printf("\n");
if (pca953x_reg_read(chip, PCA953X_IN, &data) < 0)
return -1;
printf("input: ");
for (i = msb; i >= 0; i--)
printf("%c", data & (1 << i) ? '1' : '0');
printf("\n");
if (pca953x_reg_read(chip, PCA953X_OUT, &data) < 0)
return -1;
printf("output: ");
for (i = msb; i >= 0; i--)
printf("%c", data & (1 << i) ? '1' : '0');
printf("\n");
return 0;
}
static cmd_tbl_t cmd_pca953x[] = {
U_BOOT_CMD_MKENT(device, 3, 0, (void *)PCA953X_CMD_DEVICE, "", ""),
U_BOOT_CMD_MKENT(output, 4, 0, (void *)PCA953X_CMD_OUTPUT, "", ""),
U_BOOT_CMD_MKENT(input, 3, 0, (void *)PCA953X_CMD_INPUT, "", ""),
U_BOOT_CMD_MKENT(invert, 4, 0, (void *)PCA953X_CMD_INVERT, "", ""),
U_BOOT_CMD_MKENT(info, 2, 0, (void *)PCA953X_CMD_INFO, "", ""),
};
static int do_pca953x(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
static uint8_t chip = CONFIG_SYS_I2C_PCA953X_ADDR;
int ret = CMD_RET_USAGE, val;
ulong ul_arg2 = 0;
ulong ul_arg3 = 0;
cmd_tbl_t *c;
c = find_cmd_tbl(argv[1], cmd_pca953x, ARRAY_SIZE(cmd_pca953x));
/* All commands but "device" require 'maxargs' arguments */
if (!c || !((argc == (c->maxargs)) ||
(((long)c->cmd == PCA953X_CMD_DEVICE) &&
(argc == (c->maxargs - 1))))) {
return CMD_RET_USAGE;
}
/* arg2 used as chip number or pin number */
if (argc > 2)
ul_arg2 = simple_strtoul(argv[2], NULL, 16);
/* arg3 used as pin or invert value */
if (argc > 3)
ul_arg3 = simple_strtoul(argv[3], NULL, 16) & 0x1;
switch ((long)c->cmd) {
case PCA953X_CMD_INFO:
ret = pca953x_info(chip);
if (ret)
ret = CMD_RET_FAILURE;
break;
case PCA953X_CMD_DEVICE:
if (argc == 3)
chip = (uint8_t)ul_arg2;
printf("Current device address: 0x%x\n", chip);
ret = CMD_RET_SUCCESS;
break;
case PCA953X_CMD_INPUT:
ret = pca953x_set_dir(chip, (1 << ul_arg2),
PCA953X_DIR_IN << ul_arg2);
val = (pca953x_get_val(chip) & (1 << ul_arg2)) != 0;
if (ret)
ret = CMD_RET_FAILURE;
else
printf("chip 0x%02x, pin 0x%lx = %d\n", chip, ul_arg2,
val);
break;
case PCA953X_CMD_OUTPUT:
ret = pca953x_set_dir(chip, (1 << ul_arg2),
(PCA953X_DIR_OUT << ul_arg2));
if (!ret)
ret = pca953x_set_val(chip, (1 << ul_arg2),
(ul_arg3 << ul_arg2));
if (ret)
ret = CMD_RET_FAILURE;
break;
case PCA953X_CMD_INVERT:
ret = pca953x_set_pol(chip, (1 << ul_arg2),
(ul_arg3 << ul_arg2));
if (ret)
ret = CMD_RET_FAILURE;
break;
}
if (ret == CMD_RET_FAILURE)
eprintf("Error talking to chip at 0x%x\n", chip);
return ret;
}
U_BOOT_CMD(
pca953x, 5, 1, do_pca953x,
"pca953x gpio access",
"device [dev]\n"
" - show or set current device address\n"
"pca953x info\n"
" - display info for current chip\n"
"pca953x output pin 0|1\n"
" - set pin as output and drive low or high\n"
"pca953x invert pin 0|1\n"
" - disable/enable polarity inversion for reads\n"
"pca953x input pin\n"
" - set pin as input and read value"
);
#endif /* CONFIG_CMD_PCA953X */
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