2 * Copyright 2008 Extreme Engineering Solutions, Inc.
4 * SPDX-License-Identifier: GPL-2.0
8 * Driver for NXP's 4, 8 and 16 bit I2C gpio expanders (eg pca9537, pca9557,
16 /* Default to an address that hopefully won't corrupt other i2c devices */
17 #ifndef CONFIG_SYS_I2C_PCA953X_ADDR
18 #define CONFIG_SYS_I2C_PCA953X_ADDR (~0)
29 #ifdef CONFIG_SYS_I2C_PCA953X_WIDTH
30 struct pca953x_chip_ngpio
{
35 static struct pca953x_chip_ngpio pca953x_chip_ngpios
[] =
36 CONFIG_SYS_I2C_PCA953X_WIDTH
;
39 * Determine the number of GPIO pins supported. If we don't know we assume
42 static int pca953x_ngpio(uint8_t chip
)
46 for (i
= 0; i
< ARRAY_SIZE(pca953x_chip_ngpios
); i
++)
47 if (pca953x_chip_ngpios
[i
].chip
== chip
)
48 return pca953x_chip_ngpios
[i
].ngpio
;
53 static int pca953x_ngpio(uint8_t chip
)
60 * Modify masked bits in register
62 static int pca953x_reg_write(uint8_t chip
, uint addr
, uint mask
, uint data
)
67 if (pca953x_ngpio(chip
) <= 8) {
68 if (i2c_read(chip
, addr
, 1, &valb
, 1))
74 return i2c_write(chip
, addr
, 1, &valb
, 1);
76 if (i2c_read(chip
, addr
<< 1, 1, (u8
*)&valw
, 2))
79 valw
= le16_to_cpu(valw
);
82 valw
= cpu_to_le16(valw
);
84 return i2c_write(chip
, addr
<< 1, 1, (u8
*)&valw
, 2);
88 static int pca953x_reg_read(uint8_t chip
, uint addr
, uint
*data
)
93 if (pca953x_ngpio(chip
) <= 8) {
94 if (i2c_read(chip
, addr
, 1, &valb
, 1))
98 if (i2c_read(chip
, addr
<< 1, 1, (u8
*)&valw
, 2))
100 *data
= (uint
)le16_to_cpu(valw
);
106 * Set output value of IO pins in 'mask' to corresponding value in 'data'
109 int pca953x_set_val(uint8_t chip
, uint mask
, uint data
)
111 return pca953x_reg_write(chip
, PCA953X_OUT
, mask
, data
);
115 * Set read polarity of IO pins in 'mask' to corresponding value in 'data'
116 * 0 = read pin value, 1 = read inverted pin value
118 int pca953x_set_pol(uint8_t chip
, uint mask
, uint data
)
120 return pca953x_reg_write(chip
, PCA953X_POL
, mask
, data
);
124 * Set direction of IO pins in 'mask' to corresponding value in 'data'
125 * 0 = output, 1 = input
127 int pca953x_set_dir(uint8_t chip
, uint mask
, uint data
)
129 return pca953x_reg_write(chip
, PCA953X_CONF
, mask
, data
);
133 * Read current logic level of all IO pins
135 int pca953x_get_val(uint8_t chip
)
139 if (pca953x_reg_read(chip
, PCA953X_IN
, &val
) < 0)
145 #ifdef CONFIG_CMD_PCA953X
146 #ifdef CONFIG_CMD_PCA953X_INFO
148 * Display pca953x information
150 static int pca953x_info(uint8_t chip
)
154 int nr_gpio
= pca953x_ngpio(chip
);
155 int msb
= nr_gpio
- 1;
157 printf("pca953x@ 0x%x (%d pins):\n\n", chip
, nr_gpio
);
158 printf("gpio pins: ");
159 for (i
= msb
; i
>= 0; i
--)
162 for (i
= 11 + nr_gpio
; i
> 0; i
--)
166 if (pca953x_reg_read(chip
, PCA953X_CONF
, &data
) < 0)
169 for (i
= msb
; i
>= 0; i
--)
170 printf("%c", data
& (1 << i
) ? 'i' : 'o');
173 if (pca953x_reg_read(chip
, PCA953X_POL
, &data
) < 0)
176 for (i
= msb
; i
>= 0; i
--)
177 printf("%c", data
& (1 << i
) ? '1' : '0');
180 if (pca953x_reg_read(chip
, PCA953X_IN
, &data
) < 0)
183 for (i
= msb
; i
>= 0; i
--)
184 printf("%c", data
& (1 << i
) ? '1' : '0');
187 if (pca953x_reg_read(chip
, PCA953X_OUT
, &data
) < 0)
190 for (i
= msb
; i
>= 0; i
--)
191 printf("%c", data
& (1 << i
) ? '1' : '0');
196 #endif /* CONFIG_CMD_PCA953X_INFO */
198 cmd_tbl_t cmd_pca953x
[] = {
199 U_BOOT_CMD_MKENT(device
, 3, 0, (void *)PCA953X_CMD_DEVICE
, "", ""),
200 U_BOOT_CMD_MKENT(output
, 4, 0, (void *)PCA953X_CMD_OUTPUT
, "", ""),
201 U_BOOT_CMD_MKENT(input
, 3, 0, (void *)PCA953X_CMD_INPUT
, "", ""),
202 U_BOOT_CMD_MKENT(invert
, 4, 0, (void *)PCA953X_CMD_INVERT
, "", ""),
203 #ifdef CONFIG_CMD_PCA953X_INFO
204 U_BOOT_CMD_MKENT(info
, 2, 0, (void *)PCA953X_CMD_INFO
, "", ""),
208 int do_pca953x(cmd_tbl_t
*cmdtp
, int flag
, int argc
, char * const argv
[])
210 static uint8_t chip
= CONFIG_SYS_I2C_PCA953X_ADDR
;
211 int ret
= CMD_RET_USAGE
, val
;
216 c
= find_cmd_tbl(argv
[1], cmd_pca953x
, ARRAY_SIZE(cmd_pca953x
));
218 /* All commands but "device" require 'maxargs' arguments */
219 if (!c
|| !((argc
== (c
->maxargs
)) ||
220 (((long)c
->cmd
== PCA953X_CMD_DEVICE
) &&
221 (argc
== (c
->maxargs
- 1))))) {
222 return CMD_RET_USAGE
;
225 /* arg2 used as chip number or pin number */
227 ul_arg2
= simple_strtoul(argv
[2], NULL
, 16);
229 /* arg3 used as pin or invert value */
231 ul_arg3
= simple_strtoul(argv
[3], NULL
, 16) & 0x1;
233 switch ((long)c
->cmd
) {
234 #ifdef CONFIG_CMD_PCA953X_INFO
235 case PCA953X_CMD_INFO
:
236 ret
= pca953x_info(chip
);
238 ret
= CMD_RET_FAILURE
;
242 case PCA953X_CMD_DEVICE
:
244 chip
= (uint8_t)ul_arg2
;
245 printf("Current device address: 0x%x\n", chip
);
246 ret
= CMD_RET_SUCCESS
;
249 case PCA953X_CMD_INPUT
:
250 ret
= pca953x_set_dir(chip
, (1 << ul_arg2
),
251 PCA953X_DIR_IN
<< ul_arg2
);
252 val
= (pca953x_get_val(chip
) & (1 << ul_arg2
)) != 0;
255 ret
= CMD_RET_FAILURE
;
257 printf("chip 0x%02x, pin 0x%lx = %d\n", chip
, ul_arg2
,
261 case PCA953X_CMD_OUTPUT
:
262 ret
= pca953x_set_dir(chip
, (1 << ul_arg2
),
263 (PCA953X_DIR_OUT
<< ul_arg2
));
265 ret
= pca953x_set_val(chip
, (1 << ul_arg2
),
266 (ul_arg3
<< ul_arg2
));
268 ret
= CMD_RET_FAILURE
;
271 case PCA953X_CMD_INVERT
:
272 ret
= pca953x_set_pol(chip
, (1 << ul_arg2
),
273 (ul_arg3
<< ul_arg2
));
275 ret
= CMD_RET_FAILURE
;
279 if (ret
== CMD_RET_FAILURE
)
280 eprintf("Error talking to chip at 0x%x\n", chip
);
286 pca953x
, 5, 1, do_pca953x
,
287 "pca953x gpio access",
289 " - show or set current device address\n"
290 #ifdef CONFIG_CMD_PCA953X_INFO
292 " - display info for current chip\n"
294 "pca953x output pin 0|1\n"
295 " - set pin as output and drive low or high\n"
296 "pca953x invert pin 0|1\n"
297 " - disable/enable polarity inversion for reads\n"
298 "pca953x input pin\n"
299 " - set pin as input and read value"
302 #endif /* CONFIG_CMD_PCA953X */