[thirdparty/u-boot.git] / drivers / gpio / tca642x.c

/*
 * 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 <command.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(CFG_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(CFG_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;
}

#if defined(CONFIG_CMD_TCA642X) && !defined(CONFIG_SPL_BUILD)
/*
 * 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;
}

static int tca642x_get_bank(int pin)
{
	int gpio_bank;

	if (pin <= 7) {
		gpio_bank = 0;
	} else if ((pin >= 10) && (pin <= 17)) {
		gpio_bank = 1;
	} else if ((pin >= 20) && (pin <= 27)) {
		gpio_bank = 2;
	} else {
		printf("Requested pin is not available\n");
		gpio_bank = -1;
	}

	return gpio_bank;
}

static struct cmd_tbl 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, "", ""),
};

static int do_tca642x(struct cmd_tbl *cmdtp, int flag, int argc,
		      char *const argv[])
{
	static uchar chip = CFG_SYS_I2C_TCA642X_ADDR;
	int ret = CMD_RET_USAGE, val;
	int gpio_bank = 0;
	uint8_t bank_shift;
	ulong ul_arg2 = 0;
	ulong ul_arg3 = 0;
	struct cmd_tbl *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 = dectoul(argv[2], NULL);

	/* arg3 used as pin or invert value */
	if (argc > 3)
		ul_arg3 = dectoul(argv[3], NULL) & 0x1;

	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:
		gpio_bank = tca642x_get_bank(ul_arg2);
		if (gpio_bank < 0) {
			ret = CMD_RET_FAILURE;
			goto error;
		}
		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:
		gpio_bank = tca642x_get_bank(ul_arg2);
		if (gpio_bank < 0) {
			ret = CMD_RET_FAILURE;
			goto error;
		}
		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:
		gpio_bank = tca642x_get_bank(ul_arg2);
		if (gpio_bank < 0) {
			ret = CMD_RET_FAILURE;
			goto error;
		}
		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 */
Commit	Line	Data
61c1775f DM	1	/*
	2	* Copyright 2013 Texas Instruments, Inc.
	3	* Author: Dan Murphy <dmurphy@ti.com>
	4	*
	5	* Derived work from the pca953x.c driver
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License as
	9	* published by the Free Software Foundation; either version 2 of
	10	* the License, or (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	20	* MA 02111-1307 USA
	21	*/
	22
d678a59d	23	#include <common.h>
09140113	24	#include <command.h>
61c1775f DM	25	#include <i2c.h>
	26	#include <tca642x.h>
	27
	28	/* tca642x register address definitions */
	29	struct tca642x_bank_info tca642x_regs[] = {
	30	{ .input_reg = 0x00,
	31	.output_reg = 0x04,
	32	.polarity_reg = 0x08,
	33	.configuration_reg = 0x0c },
	34	{ .input_reg = 0x01,
	35	.output_reg = 0x05,
	36	.polarity_reg = 0x09,
	37	.configuration_reg = 0x0d },
	38	{ .input_reg = 0x02,
	39	.output_reg = 0x06,
	40	.polarity_reg = 0x0a,
	41	.configuration_reg = 0x0e },
	42	};
	43
	44	/*
	45	* Modify masked bits in register
	46	*/
	47	static int tca642x_reg_write(uchar chip, uint8_t addr,
	48	uint8_t reg_bit, uint8_t data)
	49	{
	50	uint8_t valw;
	51	int org_bus_num;
	52	int ret;
	53
	54	org_bus_num = i2c_get_bus_num();
65cc0e2a	55	i2c_set_bus_num(CFG_SYS_I2C_TCA642X_BUS_NUM);
61c1775f DM	56
	57	if (i2c_read(chip, addr, 1, (uint8_t *)&valw, 1)) {
	58	printf("Could not read before writing\n");
	59	ret = -1;
	60	goto error;
	61	}
	62	valw &= ~reg_bit;
	63	valw \|= data;
	64
	65	ret = i2c_write(chip, addr, 1, (u8 *)&valw, 1);
	66
	67	error:
	68	i2c_set_bus_num(org_bus_num);
	69	return ret;
	70	}
	71
	72	static int tca642x_reg_read(uchar chip, uint8_t addr, uint8_t *data)
	73	{
	74	uint8_t valw;
	75	int org_bus_num;
	76	int ret = 0;
	77
	78	org_bus_num = i2c_get_bus_num();
65cc0e2a	79	i2c_set_bus_num(CFG_SYS_I2C_TCA642X_BUS_NUM);
61c1775f DM	80	if (i2c_read(chip, addr, 1, (u8 *)&valw, 1)) {
	81	ret = -1;
	82	goto error;
	83	}
	84
	85	*data = valw;
	86
	87	error:
	88	i2c_set_bus_num(org_bus_num);
	89	return ret;
	90	}
	91
	92	/*
	93	* Set output value of IO pins in 'reg_bit' to corresponding value in 'data'
	94	* 0 = low, 1 = high
	95	*/
	96	int tca642x_set_val(uchar chip, uint8_t gpio_bank,
	97	uint8_t reg_bit, uint8_t data)
	98	{
	99	uint8_t out_reg = tca642x_regs[gpio_bank].output_reg;
	100
	101	return tca642x_reg_write(chip, out_reg, reg_bit, data);
	102	}
	103
	104	/*
	105	* Set read polarity of IO pins in 'reg_bit' to corresponding value in 'data'
	106	* 0 = read pin value, 1 = read inverted pin value
	107	*/
	108	int tca642x_set_pol(uchar chip, uint8_t gpio_bank,
	109	uint8_t reg_bit, uint8_t data)
	110	{
	111	uint8_t pol_reg = tca642x_regs[gpio_bank].polarity_reg;
	112
	113	return tca642x_reg_write(chip, pol_reg, reg_bit, data);
	114	}
	115
	116	/*
	117	* Set direction of IO pins in 'reg_bit' to corresponding value in 'data'
	118	* 0 = output, 1 = input
	119	*/
	120	int tca642x_set_dir(uchar chip, uint8_t gpio_bank,
	121	uint8_t reg_bit, uint8_t data)
	122	{
	123	uint8_t config_reg = tca642x_regs[gpio_bank].configuration_reg;
	124
	125	return tca642x_reg_write(chip, config_reg, reg_bit, data);
	126	}
	127
	128	/*
	129	* Read current logic level of all IO pins
	130	*/
	131	int tca642x_get_val(uchar chip, uint8_t gpio_bank)
	132	{
	133	uint8_t val;
	134	uint8_t in_reg = tca642x_regs[gpio_bank].input_reg;
	135
	136	if (tca642x_reg_read(chip, in_reg, &val) < 0)
	137	return -1;
	138
	139	return (int)val;
	140	}
	141
	142	/*
	143	* Set the inital register states for the tca642x gpio expander
144	*/
145	int tca642x_set_inital_state(uchar chip, struct tca642x_bank_info init_data[])
146	{
147	int i, ret;
148	uint8_t config_reg;
149	uint8_t polarity_reg;
150	uint8_t output_reg;
151
152	for (i = 0; i < 3; i++) {
153	config_reg = tca642x_regs[i].configuration_reg;
154	ret = tca642x_reg_write(chip, config_reg, 0xff,
155	init_data[i].configuration_reg);
156	polarity_reg = tca642x_regs[i].polarity_reg;
157	ret = tca642x_reg_write(chip, polarity_reg, 0xff,
158	init_data[i].polarity_reg);
159	output_reg = tca642x_regs[i].output_reg;
160	ret = tca642x_reg_write(chip, output_reg, 0xff,
161	init_data[i].output_reg);
162	}
163
164	return ret;
165	}
166
bb2277b3	167	#if defined(CONFIG_CMD_TCA642X) && !defined(CONFIG_SPL_BUILD)
61c1775f DM	168	/*
	169	* Display tca642x information
	170	*/
	171	static int tca642x_info(uchar chip)
	172	{
	173	int i, j;
	174	uint8_t data;
	175
	176	printf("tca642x@ 0x%x (%d pins):\n", chip, 24);
	177	for (i = 0; i < 3; i++) {
	178	printf("Bank %i\n", i);
	179	if (tca642x_reg_read(chip,
	180	tca642x_regs[i].configuration_reg,
	181	&data) < 0)
	182	return -1;
	183	printf("\tConfiguration: ");
	184	for (j = 7; j >= 0; j--)
	185	printf("%c", data & (1 << j) ? 'i' : 'o');
	186	printf("\n");
	187
	188	if (tca642x_reg_read(chip,
	189	tca642x_regs[i].polarity_reg, &data) < 0)
	190	return -1;
	191	printf("\tPolarity: ");
	192	for (j = 7; j >= 0; j--)
	193	printf("%c", data & (1 << j) ? '1' : '0');
	194	printf("\n");
	195
	196	if (tca642x_reg_read(chip,
	197	tca642x_regs[i].input_reg, &data) < 0)
	198	return -1;
	199	printf("\tInput value: ");
	200	for (j = 7; j >= 0; j--)
	201	printf("%c", data & (1 << j) ? '1' : '0');
	202	printf("\n");
	203
	204	if (tca642x_reg_read(chip,
	205	tca642x_regs[i].output_reg, &data) < 0)
	206	return -1;
	207	printf("\tOutput value: ");
	208	for (j = 7; j >= 0; j--)
	209	printf("%c", data & (1 << j) ? '1' : '0');
	210	printf("\n");
	211	}
	212
	213	return 0;
	214	}
	215
49b4c54b TN	216	static int tca642x_get_bank(int pin)
	217	{
	218	int gpio_bank;
	219
	220	if (pin <= 7) {
	221	gpio_bank = 0;
	222	} else if ((pin >= 10) && (pin <= 17)) {
	223	gpio_bank = 1;
	224	} else if ((pin >= 20) && (pin <= 27)) {
	225	gpio_bank = 2;
	226	} else {
	227	printf("Requested pin is not available\n");
	228	gpio_bank = -1;
	229	}
	230
	231	return gpio_bank;
	232	}
	233
09140113	234	static struct cmd_tbl cmd_tca642x[] = {
61c1775f DM	235	U_BOOT_CMD_MKENT(device, 3, 0, (void *)TCA642X_CMD_DEVICE, "", ""),
	236	U_BOOT_CMD_MKENT(output, 4, 0, (void *)TCA642X_CMD_OUTPUT, "", ""),
	237	U_BOOT_CMD_MKENT(input, 3, 0, (void *)TCA642X_CMD_INPUT, "", ""),
	238	U_BOOT_CMD_MKENT(invert, 4, 0, (void *)TCA642X_CMD_INVERT, "", ""),
	239	U_BOOT_CMD_MKENT(info, 2, 0, (void *)TCA642X_CMD_INFO, "", ""),
	240	};
	241
09140113 SG	242	static int do_tca642x(struct cmd_tbl *cmdtp, int flag, int argc,
09140113 SG	243	char *const argv[])
61c1775f	244	{
65cc0e2a	245	static uchar chip = CFG_SYS_I2C_TCA642X_ADDR;
61c1775f	246	int ret = CMD_RET_USAGE, val;
49b4c54b	247	int gpio_bank = 0;
61c1775f DM	248	uint8_t bank_shift;
	249	ulong ul_arg2 = 0;
	250	ulong ul_arg3 = 0;
09140113	251	struct cmd_tbl *c;
61c1775f DM	252
	253	c = find_cmd_tbl(argv[1], cmd_tca642x, ARRAY_SIZE(cmd_tca642x));
	254
	255	/* All commands but "device" require 'maxargs' arguments */
	256	if (!c \|\|
	257	!((argc == (c->maxargs)) \|\|
	258	(((int)c->cmd == TCA642X_CMD_DEVICE) &&
	259	(argc == (c->maxargs - 1))))) {
	260	return CMD_RET_USAGE;
	261	}
	262
	263	/* arg2 used as chip number or pin number */
	264	if (argc > 2)
0b1284eb	265	ul_arg2 = dectoul(argv[2], NULL);
61c1775f DM	266
61c1775f DM	267	/* arg3 used as pin or invert value */
49b4c54b	268	if (argc > 3)
0b1284eb	269	ul_arg3 = dectoul(argv[3], NULL) & 0x1;
61c1775f DM	270
	271	switch ((int)c->cmd) {
	272	case TCA642X_CMD_INFO:
	273	ret = tca642x_info(chip);
	274	if (ret)
	275	ret = CMD_RET_FAILURE;
	276	break;
	277
	278	case TCA642X_CMD_DEVICE:
	279	if (argc == 3)
	280	chip = (uint8_t)ul_arg2;
	281	printf("Current device address: 0x%x\n", chip);
	282	ret = CMD_RET_SUCCESS;
	283	break;
	284
	285	case TCA642X_CMD_INPUT:
49b4c54b TN	286	gpio_bank = tca642x_get_bank(ul_arg2);
	287	if (gpio_bank < 0) {
	288	ret = CMD_RET_FAILURE;
	289	goto error;
	290	}
61c1775f DM	291	bank_shift = ul_arg2 - (gpio_bank * 10);
	292	ret = tca642x_set_dir(chip, gpio_bank, (1 << bank_shift),
	293	TCA642X_DIR_IN << bank_shift);
	294	val = (tca642x_get_val(chip, gpio_bank) &
	295	(1 << bank_shift)) != 0;
	296
	297	if (ret)
	298	ret = CMD_RET_FAILURE;
	299	else
	300	printf("chip 0x%02x, pin 0x%lx = %d\n", chip,
	301	ul_arg2, val);
	302	break;
	303
	304	case TCA642X_CMD_OUTPUT:
49b4c54b TN	305	gpio_bank = tca642x_get_bank(ul_arg2);
	306	if (gpio_bank < 0) {
	307	ret = CMD_RET_FAILURE;
	308	goto error;
	309	}
61c1775f DM	310	bank_shift = ul_arg2 - (gpio_bank * 10);
	311	ret = tca642x_set_dir(chip, gpio_bank, (1 << bank_shift),
	312	(TCA642X_DIR_OUT << bank_shift));
	313	if (!ret)
	314	ret = tca642x_set_val(chip,
	315	gpio_bank, (1 << bank_shift),
	316	(ul_arg3 << bank_shift));
	317	if (ret)
	318	ret = CMD_RET_FAILURE;
	319	break;
	320
	321	case TCA642X_CMD_INVERT:
49b4c54b TN	322	gpio_bank = tca642x_get_bank(ul_arg2);
	323	if (gpio_bank < 0) {
	324	ret = CMD_RET_FAILURE;
	325	goto error;
	326	}
61c1775f DM	327	bank_shift = ul_arg2 - (gpio_bank * 10);
	328	ret = tca642x_set_pol(chip, gpio_bank, (1 << bank_shift),
	329	(ul_arg3 << bank_shift));
	330	if (ret)
	331	ret = CMD_RET_FAILURE;
	332	break;
	333	}
	334	error:
	335	if (ret == CMD_RET_FAILURE)
	336	eprintf("Error talking to chip at 0x%x\n", chip);
	337
	338	return ret;
	339	}
	340
	341	U_BOOT_CMD(
	342	tca642x, 5, 1, do_tca642x,
	343	"tca642x gpio access",
	344	"device [dev]\n"
	345	" - show or set current device address\n"
	346	"tca642x info\n"
	347	" - display info for current chip\n"
	348	"tca642x output pin 0\|1\n"
	349	" - set pin as output and drive low or high\n"
	350	"tca642x invert pin 0\|1\n"
	351	" - disable/enable polarity inversion for reads\n"
	352	"tca642x input pin\n"
	353	" - set pin as input and read value"
	354	);
	355
	356	#endif /* CONFIG_CMD_TCA642X */