mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-10 15:14:43 +00:00
gpio: tca642x: Add the tca642x gpio expander driver
Add the tca642x gpio expander driver Datasheet: http://www.ti.com/product/tca6424a Signed-off-by: Dan Murphy <dmurphy@ti.com>
This commit is contained in:
Dan Murphy
Tom Rini
parent
f881a4df4f
commit
61c1775f16
3 changed files with 403 additions and 0 deletions
|
|
@ -33,6 +33,7 @@ COBJS-$(CONFIG_BCM2835_GPIO) += bcm2835_gpio.o
|
|||
COBJS-$(CONFIG_S3C2440_GPIO) += s3c2440_gpio.o
|
||||
COBJS-$(CONFIG_XILINX_GPIO) += xilinx_gpio.o
|
||||
COBJS-$(CONFIG_ADI_GPIO2) += adi_gpio2.o
|
||||
COBJS-$(CONFIG_TCA642X) += tca642x.o
|
||||
|
||||
COBJS := $(COBJS-y)
|
||||
SRCS := $(COBJS:.o=.c)
|
||||
|
|
|
|||
333
drivers/gpio/tca642x.c
Normal file
333
drivers/gpio/tca642x.c
Normal file
|
|
@ -0,0 +1,333 @@
|
|||
/*
|
||||
* Copyright 2013 Texas Instruments, Inc.
|
||||
* Author: Dan Murphy <dmurphy@ti.com>
|
||||
*
|
||||
* Derived work from the pca953x.c driver
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License as
|
||||
* published by the Free Software Foundation; either version 2 of
|
||||
* the License, or (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
||||
* MA 02111-1307 USA
|
||||
*/
|
||||
|
||||
#include <common.h>
|
||||
#include <i2c.h>
|
||||
#include <tca642x.h>
|
||||
|
||||
/* tca642x register address definitions */
|
||||
struct tca642x_bank_info tca642x_regs[] = {
|
||||
{ .input_reg = 0x00,
|
||||
.output_reg = 0x04,
|
||||
.polarity_reg = 0x08,
|
||||
.configuration_reg = 0x0c },
|
||||
{ .input_reg = 0x01,
|
||||
.output_reg = 0x05,
|
||||
.polarity_reg = 0x09,
|
||||
.configuration_reg = 0x0d },
|
||||
{ .input_reg = 0x02,
|
||||
.output_reg = 0x06,
|
||||
.polarity_reg = 0x0a,
|
||||
.configuration_reg = 0x0e },
|
||||
};
|
||||
|
||||
/*
|
||||
* Modify masked bits in register
|
||||
*/
|
||||
static int tca642x_reg_write(uchar chip, uint8_t addr,
|
||||
uint8_t reg_bit, uint8_t data)
|
||||
{
|
||||
uint8_t valw;
|
||||
int org_bus_num;
|
||||
int ret;
|
||||
|
||||
org_bus_num = i2c_get_bus_num();
|
||||
i2c_set_bus_num(CONFIG_SYS_I2C_TCA642X_BUS_NUM);
|
||||
|
||||
if (i2c_read(chip, addr, 1, (uint8_t *)&valw, 1)) {
|
||||
printf("Could not read before writing\n");
|
||||
ret = -1;
|
||||
goto error;
|
||||
}
|
||||
valw &= ~reg_bit;
|
||||
valw |= data;
|
||||
|
||||
ret = i2c_write(chip, addr, 1, (u8 *)&valw, 1);
|
||||
|
||||
error:
|
||||
i2c_set_bus_num(org_bus_num);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int tca642x_reg_read(uchar chip, uint8_t addr, uint8_t *data)
|
||||
{
|
||||
uint8_t valw;
|
||||
int org_bus_num;
|
||||
int ret = 0;
|
||||
|
||||
org_bus_num = i2c_get_bus_num();
|
||||
i2c_set_bus_num(CONFIG_SYS_I2C_TCA642X_BUS_NUM);
|
||||
if (i2c_read(chip, addr, 1, (u8 *)&valw, 1)) {
|
||||
ret = -1;
|
||||
goto error;
|
||||
}
|
||||
|
||||
*data = valw;
|
||||
|
||||
error:
|
||||
i2c_set_bus_num(org_bus_num);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Set output value of IO pins in 'reg_bit' to corresponding value in 'data'
|
||||
* 0 = low, 1 = high
|
||||
*/
|
||||
int tca642x_set_val(uchar chip, uint8_t gpio_bank,
|
||||
uint8_t reg_bit, uint8_t data)
|
||||
{
|
||||
uint8_t out_reg = tca642x_regs[gpio_bank].output_reg;
|
||||
|
||||
return tca642x_reg_write(chip, out_reg, reg_bit, data);
|
||||
}
|
||||
|
||||
/*
|
||||
* Set read polarity of IO pins in 'reg_bit' to corresponding value in 'data'
|
||||
* 0 = read pin value, 1 = read inverted pin value
|
||||
*/
|
||||
int tca642x_set_pol(uchar chip, uint8_t gpio_bank,
|
||||
uint8_t reg_bit, uint8_t data)
|
||||
{
|
||||
uint8_t pol_reg = tca642x_regs[gpio_bank].polarity_reg;
|
||||
|
||||
return tca642x_reg_write(chip, pol_reg, reg_bit, data);
|
||||
}
|
||||
|
||||
/*
|
||||
* Set direction of IO pins in 'reg_bit' to corresponding value in 'data'
|
||||
* 0 = output, 1 = input
|
||||
*/
|
||||
int tca642x_set_dir(uchar chip, uint8_t gpio_bank,
|
||||
uint8_t reg_bit, uint8_t data)
|
||||
{
|
||||
uint8_t config_reg = tca642x_regs[gpio_bank].configuration_reg;
|
||||
|
||||
return tca642x_reg_write(chip, config_reg, reg_bit, data);
|
||||
}
|
||||
|
||||
/*
|
||||
* Read current logic level of all IO pins
|
||||
*/
|
||||
int tca642x_get_val(uchar chip, uint8_t gpio_bank)
|
||||
{
|
||||
uint8_t val;
|
||||
uint8_t in_reg = tca642x_regs[gpio_bank].input_reg;
|
||||
|
||||
if (tca642x_reg_read(chip, in_reg, &val) < 0)
|
||||
return -1;
|
||||
|
||||
return (int)val;
|
||||
}
|
||||
|
||||
/*
|
||||
* Set the inital register states for the tca642x gpio expander
|
||||
*/
|
||||
int tca642x_set_inital_state(uchar chip, struct tca642x_bank_info init_data[])
|
||||
{
|
||||
int i, ret;
|
||||
uint8_t config_reg;
|
||||
uint8_t polarity_reg;
|
||||
uint8_t output_reg;
|
||||
|
||||
for (i = 0; i < 3; i++) {
|
||||
config_reg = tca642x_regs[i].configuration_reg;
|
||||
ret = tca642x_reg_write(chip, config_reg, 0xff,
|
||||
init_data[i].configuration_reg);
|
||||
polarity_reg = tca642x_regs[i].polarity_reg;
|
||||
ret = tca642x_reg_write(chip, polarity_reg, 0xff,
|
||||
init_data[i].polarity_reg);
|
||||
output_reg = tca642x_regs[i].output_reg;
|
||||
ret = tca642x_reg_write(chip, output_reg, 0xff,
|
||||
init_data[i].output_reg);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_CMD_TCA642X
|
||||
/*
|
||||
* Display tca642x information
|
||||
*/
|
||||
static int tca642x_info(uchar chip)
|
||||
{
|
||||
int i, j;
|
||||
uint8_t data;
|
||||
|
||||
printf("tca642x@ 0x%x (%d pins):\n", chip, 24);
|
||||
for (i = 0; i < 3; i++) {
|
||||
printf("Bank %i\n", i);
|
||||
if (tca642x_reg_read(chip,
|
||||
tca642x_regs[i].configuration_reg,
|
||||
&data) < 0)
|
||||
return -1;
|
||||
printf("\tConfiguration: ");
|
||||
for (j = 7; j >= 0; j--)
|
||||
printf("%c", data & (1 << j) ? 'i' : 'o');
|
||||
printf("\n");
|
||||
|
||||
if (tca642x_reg_read(chip,
|
||||
tca642x_regs[i].polarity_reg, &data) < 0)
|
||||
return -1;
|
||||
printf("\tPolarity: ");
|
||||
for (j = 7; j >= 0; j--)
|
||||
printf("%c", data & (1 << j) ? '1' : '0');
|
||||
printf("\n");
|
||||
|
||||
if (tca642x_reg_read(chip,
|
||||
tca642x_regs[i].input_reg, &data) < 0)
|
||||
return -1;
|
||||
printf("\tInput value: ");
|
||||
for (j = 7; j >= 0; j--)
|
||||
printf("%c", data & (1 << j) ? '1' : '0');
|
||||
printf("\n");
|
||||
|
||||
if (tca642x_reg_read(chip,
|
||||
tca642x_regs[i].output_reg, &data) < 0)
|
||||
return -1;
|
||||
printf("\tOutput value: ");
|
||||
for (j = 7; j >= 0; j--)
|
||||
printf("%c", data & (1 << j) ? '1' : '0');
|
||||
printf("\n");
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
cmd_tbl_t cmd_tca642x[] = {
|
||||
U_BOOT_CMD_MKENT(device, 3, 0, (void *)TCA642X_CMD_DEVICE, "", ""),
|
||||
U_BOOT_CMD_MKENT(output, 4, 0, (void *)TCA642X_CMD_OUTPUT, "", ""),
|
||||
U_BOOT_CMD_MKENT(input, 3, 0, (void *)TCA642X_CMD_INPUT, "", ""),
|
||||
U_BOOT_CMD_MKENT(invert, 4, 0, (void *)TCA642X_CMD_INVERT, "", ""),
|
||||
U_BOOT_CMD_MKENT(info, 2, 0, (void *)TCA642X_CMD_INFO, "", ""),
|
||||
};
|
||||
|
||||
int do_tca642x(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
|
||||
{
|
||||
static uchar chip = CONFIG_SYS_I2C_TCA642X_ADDR;
|
||||
int ret = CMD_RET_USAGE, val;
|
||||
uint8_t gpio_bank = 0;
|
||||
uint8_t bank_shift;
|
||||
ulong ul_arg2 = 0;
|
||||
ulong ul_arg3 = 0;
|
||||
cmd_tbl_t *c;
|
||||
|
||||
c = find_cmd_tbl(argv[1], cmd_tca642x, ARRAY_SIZE(cmd_tca642x));
|
||||
|
||||
/* All commands but "device" require 'maxargs' arguments */
|
||||
if (!c ||
|
||||
!((argc == (c->maxargs)) ||
|
||||
(((int)c->cmd == TCA642X_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, 10);
|
||||
|
||||
/* arg3 used as pin or invert value */
|
||||
if (argc > 3) {
|
||||
ul_arg3 = simple_strtoul(argv[3], NULL, 10) & 0x1;
|
||||
if (ul_arg2 <= 7) {
|
||||
gpio_bank = 0;
|
||||
} else if ((ul_arg2 >= 10) && (ul_arg2 <= 17)) {
|
||||
gpio_bank = 1;
|
||||
} else if ((ul_arg2 >= 20) && (ul_arg2 <= 27)) {
|
||||
gpio_bank = 2;
|
||||
} else {
|
||||
printf("Requested pin is not available\n");
|
||||
ret = CMD_RET_FAILURE;
|
||||
goto error;
|
||||
}
|
||||
}
|
||||
|
||||
switch ((int)c->cmd) {
|
||||
case TCA642X_CMD_INFO:
|
||||
ret = tca642x_info(chip);
|
||||
if (ret)
|
||||
ret = CMD_RET_FAILURE;
|
||||
break;
|
||||
|
||||
case TCA642X_CMD_DEVICE:
|
||||
if (argc == 3)
|
||||
chip = (uint8_t)ul_arg2;
|
||||
printf("Current device address: 0x%x\n", chip);
|
||||
ret = CMD_RET_SUCCESS;
|
||||
break;
|
||||
|
||||
case TCA642X_CMD_INPUT:
|
||||
bank_shift = ul_arg2 - (gpio_bank * 10);
|
||||
ret = tca642x_set_dir(chip, gpio_bank, (1 << bank_shift),
|
||||
TCA642X_DIR_IN << bank_shift);
|
||||
val = (tca642x_get_val(chip, gpio_bank) &
|
||||
(1 << bank_shift)) != 0;
|
||||
|
||||
if (ret)
|
||||
ret = CMD_RET_FAILURE;
|
||||
else
|
||||
printf("chip 0x%02x, pin 0x%lx = %d\n", chip,
|
||||
ul_arg2, val);
|
||||
break;
|
||||
|
||||
case TCA642X_CMD_OUTPUT:
|
||||
bank_shift = ul_arg2 - (gpio_bank * 10);
|
||||
ret = tca642x_set_dir(chip, gpio_bank, (1 << bank_shift),
|
||||
(TCA642X_DIR_OUT << bank_shift));
|
||||
if (!ret)
|
||||
ret = tca642x_set_val(chip,
|
||||
gpio_bank, (1 << bank_shift),
|
||||
(ul_arg3 << bank_shift));
|
||||
if (ret)
|
||||
ret = CMD_RET_FAILURE;
|
||||
break;
|
||||
|
||||
case TCA642X_CMD_INVERT:
|
||||
bank_shift = ul_arg2 - (gpio_bank * 10);
|
||||
ret = tca642x_set_pol(chip, gpio_bank, (1 << bank_shift),
|
||||
(ul_arg3 << bank_shift));
|
||||
if (ret)
|
||||
ret = CMD_RET_FAILURE;
|
||||
break;
|
||||
}
|
||||
error:
|
||||
if (ret == CMD_RET_FAILURE)
|
||||
eprintf("Error talking to chip at 0x%x\n", chip);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
U_BOOT_CMD(
|
||||
tca642x, 5, 1, do_tca642x,
|
||||
"tca642x gpio access",
|
||||
"device [dev]\n"
|
||||
" - show or set current device address\n"
|
||||
"tca642x info\n"
|
||||
" - display info for current chip\n"
|
||||
"tca642x output pin 0|1\n"
|
||||
" - set pin as output and drive low or high\n"
|
||||
"tca642x invert pin 0|1\n"
|
||||
" - disable/enable polarity inversion for reads\n"
|
||||
"tca642x input pin\n"
|
||||
" - set pin as input and read value"
|
||||
);
|
||||
|
||||
#endif /* CONFIG_CMD_TCA642X */
|
||||
69
include/tca642x.h
Normal file
69
include/tca642x.h
Normal file
|
|
@ -0,0 +1,69 @@
|
|||
/*
|
||||
* Copyright 2013 Texas Instruments, Inc.
|
||||
* Author: Dan Murphy <dmurphy@ti.com>
|
||||
*
|
||||
* Derived work from the pca953x.c driver
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License as
|
||||
* published by the Free Software Foundation; either version 2 of
|
||||
* the License, or (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
||||
* MA 02111-1307 USA
|
||||
*/
|
||||
|
||||
#ifndef __TCA642X_H_
|
||||
#define __TCA642X_H_
|
||||
|
||||
#ifdef CONFIG_CMD_TCA642X
|
||||
enum {
|
||||
TCA642X_CMD_INFO,
|
||||
TCA642X_CMD_DEVICE,
|
||||
TCA642X_CMD_OUTPUT,
|
||||
TCA642X_CMD_INPUT,
|
||||
TCA642X_CMD_INVERT,
|
||||
};
|
||||
#endif
|
||||
|
||||
#define TCA642X_OUT_LOW 0
|
||||
#define TCA642X_OUT_HIGH 1
|
||||
#define TCA642X_POL_NORMAL 0
|
||||
#define TCA642X_POL_INVERT 1
|
||||
#define TCA642X_DIR_OUT 0
|
||||
#define TCA642X_DIR_IN 1
|
||||
|
||||
/* Default to an address that hopefully won't corrupt other i2c devices */
|
||||
#ifndef CONFIG_SYS_I2C_TCA642X_ADDR
|
||||
#define CONFIG_SYS_I2C_TCA642X_ADDR (~0)
|
||||
#endif
|
||||
|
||||
/* Default to an address that hopefully won't corrupt other i2c devices */
|
||||
#ifndef CONFIG_SYS_I2C_TCA642X_BUS_NUM
|
||||
#define CONFIG_SYS_I2C_TCA642X_BUS_NUM (0)
|
||||
#endif
|
||||
|
||||
struct tca642x_bank_info {
|
||||
uint8_t input_reg;
|
||||
uint8_t output_reg;
|
||||
uint8_t polarity_reg;
|
||||
uint8_t configuration_reg;
|
||||
};
|
||||
|
||||
int tca642x_set_val(uchar chip, uint8_t gpio_bank,
|
||||
uint8_t reg_bit, uint8_t data);
|
||||
int tca642x_set_pol(uchar chip, uint8_t gpio_bank,
|
||||
uint8_t reg_bit, uint8_t data);
|
||||
int tca642x_set_dir(uchar chip, uint8_t gpio_bank,
|
||||
uint8_t reg_bit, uint8_t data);
|
||||
int tca642x_get_val(uchar chip, uint8_t gpio_bank);
|
||||
int tca642x_set_inital_state(uchar chip, struct tca642x_bank_info init_data[]);
|
||||
|
||||
#endif /* __TCA642X_H_ */
|
||||
Loading…
Reference in a new issue