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 */