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Peter Tysere92739d2008-12-17 16:36:21 -06001/*
2 * Copyright 2008 Extreme Engineering Solutions, Inc.
3 *
Tom Rini5b8031c2016-01-14 22:05:13 -05004 * SPDX-License-Identifier: GPL-2.0
Peter Tysere92739d2008-12-17 16:36:21 -06005 */
6
7/*
Chris Packham5dec49c2010-12-19 10:12:13 +00008 * Driver for NXP's 4, 8 and 16 bit I2C gpio expanders (eg pca9537, pca9557,
9 * pca9539, etc)
Peter Tysere92739d2008-12-17 16:36:21 -060010 */
11
12#include <common.h>
13#include <i2c.h>
14#include <pca953x.h>
15
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)
19#endif
20
21enum {
22 PCA953X_CMD_INFO,
23 PCA953X_CMD_DEVICE,
24 PCA953X_CMD_OUTPUT,
25 PCA953X_CMD_INPUT,
26 PCA953X_CMD_INVERT,
27};
28
Chris Packham5dec49c2010-12-19 10:12:13 +000029#ifdef CONFIG_SYS_I2C_PCA953X_WIDTH
30struct pca953x_chip_ngpio {
31 uint8_t chip;
32 uint8_t ngpio;
33};
34
35static struct pca953x_chip_ngpio pca953x_chip_ngpios[] =
36 CONFIG_SYS_I2C_PCA953X_WIDTH;
37
Chris Packham5dec49c2010-12-19 10:12:13 +000038/*
39 * Determine the number of GPIO pins supported. If we don't know we assume
40 * 8 pins.
41 */
42static int pca953x_ngpio(uint8_t chip)
43{
44 int i;
45
Axel Linf2187612013-06-22 18:22:48 +080046 for (i = 0; i < ARRAY_SIZE(pca953x_chip_ngpios); i++)
Chris Packham5dec49c2010-12-19 10:12:13 +000047 if (pca953x_chip_ngpios[i].chip == chip)
48 return pca953x_chip_ngpios[i].ngpio;
49
50 return 8;
51}
52#else
53static int pca953x_ngpio(uint8_t chip)
54{
55 return 8;
56}
57#endif
58
Peter Tysere92739d2008-12-17 16:36:21 -060059/*
60 * Modify masked bits in register
61 */
62static int pca953x_reg_write(uint8_t chip, uint addr, uint mask, uint data)
63{
Chris Packham5dec49c2010-12-19 10:12:13 +000064 uint8_t valb;
65 uint16_t valw;
Peter Tysere92739d2008-12-17 16:36:21 -060066
Chris Packham5dec49c2010-12-19 10:12:13 +000067 if (pca953x_ngpio(chip) <= 8) {
68 if (i2c_read(chip, addr, 1, &valb, 1))
69 return -1;
Peter Tysere92739d2008-12-17 16:36:21 -060070
Chris Packham5dec49c2010-12-19 10:12:13 +000071 valb &= ~mask;
72 valb |= data;
Peter Tysere92739d2008-12-17 16:36:21 -060073
Chris Packham5dec49c2010-12-19 10:12:13 +000074 return i2c_write(chip, addr, 1, &valb, 1);
75 } else {
76 if (i2c_read(chip, addr << 1, 1, (u8*)&valw, 2))
77 return -1;
78
Dirk Eibachdaa75b32015-10-29 13:51:27 +010079 valw = le16_to_cpu(valw);
Chris Packham5dec49c2010-12-19 10:12:13 +000080 valw &= ~mask;
81 valw |= data;
Dirk Eibachdaa75b32015-10-29 13:51:27 +010082 valw = cpu_to_le16(valw);
Chris Packham5dec49c2010-12-19 10:12:13 +000083
84 return i2c_write(chip, addr << 1, 1, (u8*)&valw, 2);
85 }
86}
87
88static int pca953x_reg_read(uint8_t chip, uint addr, uint *data)
89{
90 uint8_t valb;
91 uint16_t valw;
92
93 if (pca953x_ngpio(chip) <= 8) {
94 if (i2c_read(chip, addr, 1, &valb, 1))
95 return -1;
96 *data = (int)valb;
97 } else {
98 if (i2c_read(chip, addr << 1, 1, (u8*)&valw, 2))
99 return -1;
Dirk Eibachdaa75b32015-10-29 13:51:27 +0100100 *data = (uint)le16_to_cpu(valw);
Chris Packham5dec49c2010-12-19 10:12:13 +0000101 }
102 return 0;
Peter Tysere92739d2008-12-17 16:36:21 -0600103}
104
105/*
106 * Set output value of IO pins in 'mask' to corresponding value in 'data'
107 * 0 = low, 1 = high
108 */
109int pca953x_set_val(uint8_t chip, uint mask, uint data)
110{
111 return pca953x_reg_write(chip, PCA953X_OUT, mask, data);
112}
113
114/*
115 * Set read polarity of IO pins in 'mask' to corresponding value in 'data'
116 * 0 = read pin value, 1 = read inverted pin value
117 */
118int pca953x_set_pol(uint8_t chip, uint mask, uint data)
119{
120 return pca953x_reg_write(chip, PCA953X_POL, mask, data);
121}
122
123/*
124 * Set direction of IO pins in 'mask' to corresponding value in 'data'
125 * 0 = output, 1 = input
126 */
127int pca953x_set_dir(uint8_t chip, uint mask, uint data)
128{
129 return pca953x_reg_write(chip, PCA953X_CONF, mask, data);
130}
131
132/*
133 * Read current logic level of all IO pins
134 */
135int pca953x_get_val(uint8_t chip)
136{
Chris Packham5dec49c2010-12-19 10:12:13 +0000137 uint val;
Peter Tysere92739d2008-12-17 16:36:21 -0600138
Chris Packham5dec49c2010-12-19 10:12:13 +0000139 if (pca953x_reg_read(chip, PCA953X_IN, &val) < 0)
Peter Tysere92739d2008-12-17 16:36:21 -0600140 return -1;
141
142 return (int)val;
143}
144
145#ifdef CONFIG_CMD_PCA953X
Peter Tysere92739d2008-12-17 16:36:21 -0600146/*
147 * Display pca953x information
148 */
149static int pca953x_info(uint8_t chip)
150{
151 int i;
Chris Packham5dec49c2010-12-19 10:12:13 +0000152 uint data;
153 int nr_gpio = pca953x_ngpio(chip);
154 int msb = nr_gpio - 1;
Peter Tysere92739d2008-12-17 16:36:21 -0600155
Chris Packham5dec49c2010-12-19 10:12:13 +0000156 printf("pca953x@ 0x%x (%d pins):\n\n", chip, nr_gpio);
157 printf("gpio pins: ");
158 for (i = msb; i >= 0; i--)
159 printf("%x", i);
160 printf("\n");
161 for (i = 11 + nr_gpio; i > 0; i--)
162 printf("-");
163 printf("\n");
Peter Tysere92739d2008-12-17 16:36:21 -0600164
Chris Packham5dec49c2010-12-19 10:12:13 +0000165 if (pca953x_reg_read(chip, PCA953X_CONF, &data) < 0)
Peter Tysere92739d2008-12-17 16:36:21 -0600166 return -1;
167 printf("conf: ");
Chris Packham5dec49c2010-12-19 10:12:13 +0000168 for (i = msb; i >= 0; i--)
Peter Tysere92739d2008-12-17 16:36:21 -0600169 printf("%c", data & (1 << i) ? 'i' : 'o');
170 printf("\n");
171
Chris Packham5dec49c2010-12-19 10:12:13 +0000172 if (pca953x_reg_read(chip, PCA953X_POL, &data) < 0)
Peter Tysere92739d2008-12-17 16:36:21 -0600173 return -1;
174 printf("invert: ");
Chris Packham5dec49c2010-12-19 10:12:13 +0000175 for (i = msb; i >= 0; i--)
Peter Tysere92739d2008-12-17 16:36:21 -0600176 printf("%c", data & (1 << i) ? '1' : '0');
177 printf("\n");
178
Chris Packham5dec49c2010-12-19 10:12:13 +0000179 if (pca953x_reg_read(chip, PCA953X_IN, &data) < 0)
Peter Tysere92739d2008-12-17 16:36:21 -0600180 return -1;
181 printf("input: ");
Chris Packham5dec49c2010-12-19 10:12:13 +0000182 for (i = msb; i >= 0; i--)
Peter Tysere92739d2008-12-17 16:36:21 -0600183 printf("%c", data & (1 << i) ? '1' : '0');
184 printf("\n");
185
Chris Packham5dec49c2010-12-19 10:12:13 +0000186 if (pca953x_reg_read(chip, PCA953X_OUT, &data) < 0)
Peter Tysere92739d2008-12-17 16:36:21 -0600187 return -1;
188 printf("output: ");
Chris Packham5dec49c2010-12-19 10:12:13 +0000189 for (i = msb; i >= 0; i--)
Peter Tysere92739d2008-12-17 16:36:21 -0600190 printf("%c", data & (1 << i) ? '1' : '0');
191 printf("\n");
192
193 return 0;
194}
Peter Tysere92739d2008-12-17 16:36:21 -0600195
196cmd_tbl_t cmd_pca953x[] = {
197 U_BOOT_CMD_MKENT(device, 3, 0, (void *)PCA953X_CMD_DEVICE, "", ""),
198 U_BOOT_CMD_MKENT(output, 4, 0, (void *)PCA953X_CMD_OUTPUT, "", ""),
199 U_BOOT_CMD_MKENT(input, 3, 0, (void *)PCA953X_CMD_INPUT, "", ""),
200 U_BOOT_CMD_MKENT(invert, 4, 0, (void *)PCA953X_CMD_INVERT, "", ""),
Peter Tysere92739d2008-12-17 16:36:21 -0600201 U_BOOT_CMD_MKENT(info, 2, 0, (void *)PCA953X_CMD_INFO, "", ""),
Peter Tysere92739d2008-12-17 16:36:21 -0600202};
203
Wolfgang Denk54841ab2010-06-28 22:00:46 +0200204int do_pca953x(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
Peter Tysere92739d2008-12-17 16:36:21 -0600205{
206 static uint8_t chip = CONFIG_SYS_I2C_PCA953X_ADDR;
Laurence Withers633efe92012-07-25 03:55:48 +0000207 int ret = CMD_RET_USAGE, val;
Peter Tysere92739d2008-12-17 16:36:21 -0600208 ulong ul_arg2 = 0;
209 ulong ul_arg3 = 0;
210 cmd_tbl_t *c;
211
212 c = find_cmd_tbl(argv[1], cmd_pca953x, ARRAY_SIZE(cmd_pca953x));
213
214 /* All commands but "device" require 'maxargs' arguments */
215 if (!c || !((argc == (c->maxargs)) ||
Michal Simek01b2a692016-04-11 13:51:26 +0200216 (((long)c->cmd == PCA953X_CMD_DEVICE) &&
Peter Tysere92739d2008-12-17 16:36:21 -0600217 (argc == (c->maxargs - 1))))) {
Laurence Withers633efe92012-07-25 03:55:48 +0000218 return CMD_RET_USAGE;
Peter Tysere92739d2008-12-17 16:36:21 -0600219 }
220
221 /* arg2 used as chip number or pin number */
222 if (argc > 2)
223 ul_arg2 = simple_strtoul(argv[2], NULL, 16);
224
225 /* arg3 used as pin or invert value */
226 if (argc > 3)
227 ul_arg3 = simple_strtoul(argv[3], NULL, 16) & 0x1;
228
Michal Simek01b2a692016-04-11 13:51:26 +0200229 switch ((long)c->cmd) {
Peter Tysere92739d2008-12-17 16:36:21 -0600230 case PCA953X_CMD_INFO:
Laurence Withers633efe92012-07-25 03:55:48 +0000231 ret = pca953x_info(chip);
232 if (ret)
233 ret = CMD_RET_FAILURE;
234 break;
Laurence Withers633efe92012-07-25 03:55:48 +0000235
Peter Tysere92739d2008-12-17 16:36:21 -0600236 case PCA953X_CMD_DEVICE:
237 if (argc == 3)
238 chip = (uint8_t)ul_arg2;
239 printf("Current device address: 0x%x\n", chip);
Laurence Withers633efe92012-07-25 03:55:48 +0000240 ret = CMD_RET_SUCCESS;
241 break;
242
Peter Tysere92739d2008-12-17 16:36:21 -0600243 case PCA953X_CMD_INPUT:
Laurence Withers633efe92012-07-25 03:55:48 +0000244 ret = pca953x_set_dir(chip, (1 << ul_arg2),
Peter Tysere92739d2008-12-17 16:36:21 -0600245 PCA953X_DIR_IN << ul_arg2);
246 val = (pca953x_get_val(chip) & (1 << ul_arg2)) != 0;
247
Laurence Withers633efe92012-07-25 03:55:48 +0000248 if (ret)
249 ret = CMD_RET_FAILURE;
250 else
251 printf("chip 0x%02x, pin 0x%lx = %d\n", chip, ul_arg2,
252 val);
253 break;
254
Peter Tysere92739d2008-12-17 16:36:21 -0600255 case PCA953X_CMD_OUTPUT:
Laurence Withers633efe92012-07-25 03:55:48 +0000256 ret = pca953x_set_dir(chip, (1 << ul_arg2),
Peter Tysere92739d2008-12-17 16:36:21 -0600257 (PCA953X_DIR_OUT << ul_arg2));
Laurence Withers633efe92012-07-25 03:55:48 +0000258 if (!ret)
259 ret = pca953x_set_val(chip, (1 << ul_arg2),
260 (ul_arg3 << ul_arg2));
261 if (ret)
262 ret = CMD_RET_FAILURE;
263 break;
264
Peter Tysere92739d2008-12-17 16:36:21 -0600265 case PCA953X_CMD_INVERT:
Laurence Withers633efe92012-07-25 03:55:48 +0000266 ret = pca953x_set_pol(chip, (1 << ul_arg2),
Peter Tysere92739d2008-12-17 16:36:21 -0600267 (ul_arg3 << ul_arg2));
Laurence Withers633efe92012-07-25 03:55:48 +0000268 if (ret)
269 ret = CMD_RET_FAILURE;
270 break;
Peter Tysere92739d2008-12-17 16:36:21 -0600271 }
Laurence Withers633efe92012-07-25 03:55:48 +0000272
273 if (ret == CMD_RET_FAILURE)
274 eprintf("Error talking to chip at 0x%x\n", chip);
275
276 return ret;
Peter Tysere92739d2008-12-17 16:36:21 -0600277}
278
279U_BOOT_CMD(
280 pca953x, 5, 1, do_pca953x,
Peter Tyser2fb26042009-01-27 18:03:12 -0600281 "pca953x gpio access",
Peter Tysere92739d2008-12-17 16:36:21 -0600282 "device [dev]\n"
283 " - show or set current device address\n"
Peter Tysere92739d2008-12-17 16:36:21 -0600284 "pca953x info\n"
285 " - display info for current chip\n"
Peter Tysere92739d2008-12-17 16:36:21 -0600286 "pca953x output pin 0|1\n"
287 " - set pin as output and drive low or high\n"
288 "pca953x invert pin 0|1\n"
289 " - disable/enable polarity inversion for reads\n"
Laurence Withersd75bc032012-07-25 03:55:47 +0000290 "pca953x input pin\n"
Wolfgang Denka89c33d2009-05-24 17:06:54 +0200291 " - set pin as input and read value"
Peter Tysere92739d2008-12-17 16:36:21 -0600292);
293
294#endif /* CONFIG_CMD_PCA953X */