blob: 1c5e314d9d51e0d13f3d1fd1895299dcf37c6dab [file] [log] [blame]
Peter Tysere92739d2008-12-17 16:36:21 -06001/*
2 * Copyright 2008 Extreme Engineering Solutions, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * Version 2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
16 * MA 02111-1307 USA
17 */
18
19/*
20 * Driver for NXP's 4 and 8 bit I2C gpio expanders (eg pca9537, pca9557, etc)
21 * TODO: support additional devices with more than 8-bits GPIO
22 */
23
24#include <common.h>
25#include <i2c.h>
26#include <pca953x.h>
27
28/* Default to an address that hopefully won't corrupt other i2c devices */
29#ifndef CONFIG_SYS_I2C_PCA953X_ADDR
30#define CONFIG_SYS_I2C_PCA953X_ADDR (~0)
31#endif
32
33enum {
34 PCA953X_CMD_INFO,
35 PCA953X_CMD_DEVICE,
36 PCA953X_CMD_OUTPUT,
37 PCA953X_CMD_INPUT,
38 PCA953X_CMD_INVERT,
39};
40
41/*
42 * Modify masked bits in register
43 */
44static int pca953x_reg_write(uint8_t chip, uint addr, uint mask, uint data)
45{
46 uint8_t val;
47
48 if (i2c_read(chip, addr, 1, &val, 1))
49 return -1;
50
51 val &= ~mask;
52 val |= data;
53
54 return i2c_write(chip, addr, 1, &val, 1);
55}
56
57/*
58 * Set output value of IO pins in 'mask' to corresponding value in 'data'
59 * 0 = low, 1 = high
60 */
61int pca953x_set_val(uint8_t chip, uint mask, uint data)
62{
63 return pca953x_reg_write(chip, PCA953X_OUT, mask, data);
64}
65
66/*
67 * Set read polarity of IO pins in 'mask' to corresponding value in 'data'
68 * 0 = read pin value, 1 = read inverted pin value
69 */
70int pca953x_set_pol(uint8_t chip, uint mask, uint data)
71{
72 return pca953x_reg_write(chip, PCA953X_POL, mask, data);
73}
74
75/*
76 * Set direction of IO pins in 'mask' to corresponding value in 'data'
77 * 0 = output, 1 = input
78 */
79int pca953x_set_dir(uint8_t chip, uint mask, uint data)
80{
81 return pca953x_reg_write(chip, PCA953X_CONF, mask, data);
82}
83
84/*
85 * Read current logic level of all IO pins
86 */
87int pca953x_get_val(uint8_t chip)
88{
89 uint8_t val;
90
91 if (i2c_read(chip, 0, 1, &val, 1))
92 return -1;
93
94 return (int)val;
95}
96
97#ifdef CONFIG_CMD_PCA953X
98#ifdef CONFIG_CMD_PCA953X_INFO
99/*
100 * Display pca953x information
101 */
102static int pca953x_info(uint8_t chip)
103{
104 int i;
105 uint8_t data;
106
107 printf("pca953x@ 0x%x:\n\n", chip);
108 printf("gpio pins: 76543210\n");
109 printf("-------------------\n");
110
111 if (i2c_read(chip, PCA953X_CONF, 1, &data, 1))
112 return -1;
113 printf("conf: ");
114 for (i = 7; i >= 0; i--)
115 printf("%c", data & (1 << i) ? 'i' : 'o');
116 printf("\n");
117
118 if (i2c_read(chip, PCA953X_POL, 1, &data, 1))
119 return -1;
120 printf("invert: ");
121 for (i = 7; i >= 0; i--)
122 printf("%c", data & (1 << i) ? '1' : '0');
123 printf("\n");
124
125 if (i2c_read(chip, PCA953X_IN, 1, &data, 1))
126 return -1;
127 printf("input: ");
128 for (i = 7; i >= 0; i--)
129 printf("%c", data & (1 << i) ? '1' : '0');
130 printf("\n");
131
132 if (i2c_read(chip, PCA953X_OUT, 1, &data, 1))
133 return -1;
134 printf("output: ");
135 for (i = 7; i >= 0; i--)
136 printf("%c", data & (1 << i) ? '1' : '0');
137 printf("\n");
138
139 return 0;
140}
141#endif /* CONFIG_CMD_PCA953X_INFO */
142
143cmd_tbl_t cmd_pca953x[] = {
144 U_BOOT_CMD_MKENT(device, 3, 0, (void *)PCA953X_CMD_DEVICE, "", ""),
145 U_BOOT_CMD_MKENT(output, 4, 0, (void *)PCA953X_CMD_OUTPUT, "", ""),
146 U_BOOT_CMD_MKENT(input, 3, 0, (void *)PCA953X_CMD_INPUT, "", ""),
147 U_BOOT_CMD_MKENT(invert, 4, 0, (void *)PCA953X_CMD_INVERT, "", ""),
148#ifdef CONFIG_CMD_PCA953X_INFO
149 U_BOOT_CMD_MKENT(info, 2, 0, (void *)PCA953X_CMD_INFO, "", ""),
150#endif
151};
152
153int do_pca953x(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
154{
155 static uint8_t chip = CONFIG_SYS_I2C_PCA953X_ADDR;
156 int val;
157 ulong ul_arg2 = 0;
158 ulong ul_arg3 = 0;
159 cmd_tbl_t *c;
160
161 c = find_cmd_tbl(argv[1], cmd_pca953x, ARRAY_SIZE(cmd_pca953x));
162
163 /* All commands but "device" require 'maxargs' arguments */
164 if (!c || !((argc == (c->maxargs)) ||
165 (((int)c->cmd == PCA953X_CMD_DEVICE) &&
166 (argc == (c->maxargs - 1))))) {
Peter Tyser62c3ae72009-01-27 18:03:10 -0600167 cmd_usage(cmdtp);
Peter Tysere92739d2008-12-17 16:36:21 -0600168 return 1;
169 }
170
171 /* arg2 used as chip number or pin number */
172 if (argc > 2)
173 ul_arg2 = simple_strtoul(argv[2], NULL, 16);
174
175 /* arg3 used as pin or invert value */
176 if (argc > 3)
177 ul_arg3 = simple_strtoul(argv[3], NULL, 16) & 0x1;
178
179 switch ((int)c->cmd) {
180#ifdef CONFIG_CMD_PCA953X_INFO
181 case PCA953X_CMD_INFO:
182 return pca953x_info(chip);
183#endif
184 case PCA953X_CMD_DEVICE:
185 if (argc == 3)
186 chip = (uint8_t)ul_arg2;
187 printf("Current device address: 0x%x\n", chip);
188 return 0;
189 case PCA953X_CMD_INPUT:
190 pca953x_set_dir(chip, (1 << ul_arg2),
191 PCA953X_DIR_IN << ul_arg2);
192 val = (pca953x_get_val(chip) & (1 << ul_arg2)) != 0;
193
194 printf("chip 0x%02x, pin 0x%lx = %d\n", chip, ul_arg2, val);
195 return val;
196 case PCA953X_CMD_OUTPUT:
197 pca953x_set_dir(chip, (1 << ul_arg2),
198 (PCA953X_DIR_OUT << ul_arg2));
199 return pca953x_set_val(chip, (1 << ul_arg2),
200 (ul_arg3 << ul_arg2));
201 case PCA953X_CMD_INVERT:
202 return pca953x_set_pol(chip, (1 << ul_arg2),
203 (ul_arg3 << ul_arg2));
204 default:
205 /* We should never get here */
206 return 1;
207 }
208}
209
210U_BOOT_CMD(
211 pca953x, 5, 1, do_pca953x,
Peter Tyser2fb26042009-01-27 18:03:12 -0600212 "pca953x gpio access",
Peter Tysere92739d2008-12-17 16:36:21 -0600213 "device [dev]\n"
214 " - show or set current device address\n"
215#ifdef CONFIG_CMD_PCA953X_INFO
216 "pca953x info\n"
217 " - display info for current chip\n"
218#endif
219 "pca953x output pin 0|1\n"
220 " - set pin as output and drive low or high\n"
221 "pca953x invert pin 0|1\n"
222 " - disable/enable polarity inversion for reads\n"
223 "pca953x intput pin\n"
224 " - set pin as input and read value\n"
225);
226
227#endif /* CONFIG_CMD_PCA953X */