1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Copyright 2008 Extreme Engineering Solutions, Inc. 4 */ 5 6/* 7 * Driver for NXP's 4, 8 and 16 bit I2C gpio expanders (eg pca9537, pca9557, 8 * pca9539, etc) 9 */ 10 11#include <config.h> 12#include <command.h> 13#include <i2c.h> 14#include <pca953x.h> 15#include <vsprintf.h> 16 17/* Default to an address that hopefully won't corrupt other i2c devices */ 18#ifndef CFG_SYS_I2C_PCA953X_ADDR 19#define CFG_SYS_I2C_PCA953X_ADDR (~0) 20#endif 21 22enum { 23 PCA953X_CMD_INFO, 24 PCA953X_CMD_DEVICE, 25 PCA953X_CMD_OUTPUT, 26 PCA953X_CMD_INPUT, 27 PCA953X_CMD_INVERT, 28}; 29 30#ifdef CFG_SYS_I2C_PCA953X_WIDTH 31struct pca953x_chip_ngpio { 32 uint8_t chip; 33 uint8_t ngpio; 34}; 35 36static struct pca953x_chip_ngpio pca953x_chip_ngpios[] = 37 CFG_SYS_I2C_PCA953X_WIDTH; 38 39/* 40 * Determine the number of GPIO pins supported. If we don't know we assume 41 * 8 pins. 42 */ 43static int pca953x_ngpio(uint8_t chip) 44{ 45 int i; 46 47 for (i = 0; i < ARRAY_SIZE(pca953x_chip_ngpios); i++) 48 if (pca953x_chip_ngpios[i].chip == chip) 49 return pca953x_chip_ngpios[i].ngpio; 50 51 return 8; 52} 53#else 54static int pca953x_ngpio(uint8_t chip) 55{ 56 return 8; 57} 58#endif 59 60/* 61 * Modify masked bits in register 62 */ 63static int pca953x_reg_write(uint8_t chip, uint addr, uint mask, uint data) 64{ 65 uint8_t valb; 66 uint16_t valw; 67 68 if (pca953x_ngpio(chip) <= 8) { 69 if (i2c_read(chip, addr, 1, &valb, 1)) 70 return -1; 71 72 valb &= ~mask; 73 valb |= data; 74 75 return i2c_write(chip, addr, 1, &valb, 1); 76 } else { 77 if (i2c_read(chip, addr << 1, 1, (u8*)&valw, 2)) 78 return -1; 79 80 valw = le16_to_cpu(valw); 81 valw &= ~mask; 82 valw |= data; 83 valw = cpu_to_le16(valw); 84 85 return i2c_write(chip, addr << 1, 1, (u8*)&valw, 2); 86 } 87} 88 89static int pca953x_reg_read(uint8_t chip, uint addr, uint *data) 90{ 91 uint8_t valb; 92 uint16_t valw; 93 94 if (pca953x_ngpio(chip) <= 8) { 95 if (i2c_read(chip, addr, 1, &valb, 1)) 96 return -1; 97 *data = (int)valb; 98 } else { 99 if (i2c_read(chip, addr << 1, 1, (u8*)&valw, 2)) 100 return -1; 101 *data = (uint)le16_to_cpu(valw); 102 } 103 return 0; 104} 105 106/* 107 * Set output value of IO pins in 'mask' to corresponding value in 'data' 108 * 0 = low, 1 = high 109 */ 110int pca953x_set_val(uint8_t chip, uint mask, uint data) 111{ 112 return pca953x_reg_write(chip, PCA953X_OUT, mask, data); 113} 114 115/* 116 * Set read polarity of IO pins in 'mask' to corresponding value in 'data' 117 * 0 = read pin value, 1 = read inverted pin value 118 */ 119int pca953x_set_pol(uint8_t chip, uint mask, uint data) 120{ 121 return pca953x_reg_write(chip, PCA953X_POL, mask, data); 122} 123 124/* 125 * Set direction of IO pins in 'mask' to corresponding value in 'data' 126 * 0 = output, 1 = input 127 */ 128int pca953x_set_dir(uint8_t chip, uint mask, uint data) 129{ 130 return pca953x_reg_write(chip, PCA953X_CONF, mask, data); 131} 132 133/* 134 * Read current logic level of all IO pins 135 */ 136int pca953x_get_val(uint8_t chip) 137{ 138 uint val; 139 140 if (pca953x_reg_read(chip, PCA953X_IN, &val) < 0) 141 return -1; 142 143 return (int)val; 144} 145 146#if defined(CONFIG_CMD_PCA953X) && !defined(CONFIG_SPL_BUILD) 147/* 148 * Display pca953x information 149 */ 150static int pca953x_info(uint8_t chip) 151{ 152 int i; 153 uint data; 154 int nr_gpio = pca953x_ngpio(chip); 155 int msb = nr_gpio - 1; 156 157 printf("pca953x@ 0x%x (%d pins):\n\n", chip, nr_gpio); 158 printf("gpio pins: "); 159 for (i = msb; i >= 0; i--) 160 printf("%x", i); 161 printf("\n"); 162 for (i = 11 + nr_gpio; i > 0; i--) 163 printf("-"); 164 printf("\n"); 165 166 if (pca953x_reg_read(chip, PCA953X_CONF, &data) < 0) 167 return -1; 168 printf("conf: "); 169 for (i = msb; i >= 0; i--) 170 printf("%c", data & (1 << i) ? 'i' : 'o'); 171 printf("\n"); 172 173 if (pca953x_reg_read(chip, PCA953X_POL, &data) < 0) 174 return -1; 175 printf("invert: "); 176 for (i = msb; i >= 0; i--) 177 printf("%c", data & (1 << i) ? '1' : '0'); 178 printf("\n"); 179 180 if (pca953x_reg_read(chip, PCA953X_IN, &data) < 0) 181 return -1; 182 printf("input: "); 183 for (i = msb; i >= 0; i--) 184 printf("%c", data & (1 << i) ? '1' : '0'); 185 printf("\n"); 186 187 if (pca953x_reg_read(chip, PCA953X_OUT, &data) < 0) 188 return -1; 189 printf("output: "); 190 for (i = msb; i >= 0; i--) 191 printf("%c", data & (1 << i) ? '1' : '0'); 192 printf("\n"); 193 194 return 0; 195} 196 197static struct cmd_tbl cmd_pca953x[] = { 198 U_BOOT_CMD_MKENT(device, 3, 0, (void *)PCA953X_CMD_DEVICE, "", ""), 199 U_BOOT_CMD_MKENT(output, 4, 0, (void *)PCA953X_CMD_OUTPUT, "", ""), 200 U_BOOT_CMD_MKENT(input, 3, 0, (void *)PCA953X_CMD_INPUT, "", ""), 201 U_BOOT_CMD_MKENT(invert, 4, 0, (void *)PCA953X_CMD_INVERT, "", ""), 202 U_BOOT_CMD_MKENT(info, 2, 0, (void *)PCA953X_CMD_INFO, "", ""), 203}; 204 205static int do_pca953x(struct cmd_tbl *cmdtp, int flag, int argc, 206 char *const argv[]) 207{ 208 static uint8_t chip = CFG_SYS_I2C_PCA953X_ADDR; 209 int ret = CMD_RET_USAGE, val; 210 ulong ul_arg2 = 0; 211 ulong ul_arg3 = 0; 212 struct cmd_tbl *c; 213 214 c = find_cmd_tbl(argv[1], cmd_pca953x, ARRAY_SIZE(cmd_pca953x)); 215 216 /* All commands but "device" require 'maxargs' arguments */ 217 if (!c || !((argc == (c->maxargs)) || 218 (((long)c->cmd == PCA953X_CMD_DEVICE) && 219 (argc == (c->maxargs - 1))))) { 220 return CMD_RET_USAGE; 221 } 222 223 /* arg2 used as chip number or pin number */ 224 if (argc > 2) 225 ul_arg2 = hextoul(argv[2], NULL); 226 227 /* arg3 used as pin or invert value */ 228 if (argc > 3) 229 ul_arg3 = hextoul(argv[3], NULL) & 0x1; 230 231 switch ((long)c->cmd) { 232 case PCA953X_CMD_INFO: 233 ret = pca953x_info(chip); 234 if (ret) 235 ret = CMD_RET_FAILURE; 236 break; 237 238 case PCA953X_CMD_DEVICE: 239 if (argc == 3) 240 chip = (uint8_t)ul_arg2; 241 printf("Current device address: 0x%x\n", chip); 242 ret = CMD_RET_SUCCESS; 243 break; 244 245 case PCA953X_CMD_INPUT: 246 ret = pca953x_set_dir(chip, (1 << ul_arg2), 247 PCA953X_DIR_IN << ul_arg2); 248 val = (pca953x_get_val(chip) & (1 << ul_arg2)) != 0; 249 250 if (ret) 251 ret = CMD_RET_FAILURE; 252 else 253 printf("chip 0x%02x, pin 0x%lx = %d\n", chip, ul_arg2, 254 val); 255 break; 256 257 case PCA953X_CMD_OUTPUT: 258 ret = pca953x_set_dir(chip, (1 << ul_arg2), 259 (PCA953X_DIR_OUT << ul_arg2)); 260 if (!ret) 261 ret = pca953x_set_val(chip, (1 << ul_arg2), 262 (ul_arg3 << ul_arg2)); 263 if (ret) 264 ret = CMD_RET_FAILURE; 265 break; 266 267 case PCA953X_CMD_INVERT: 268 ret = pca953x_set_pol(chip, (1 << ul_arg2), 269 (ul_arg3 << ul_arg2)); 270 if (ret) 271 ret = CMD_RET_FAILURE; 272 break; 273 } 274 275 if (ret == CMD_RET_FAILURE) 276 eprintf("Error talking to chip at 0x%x\n", chip); 277 278 return ret; 279} 280 281U_BOOT_CMD( 282 pca953x, 5, 1, do_pca953x, 283 "pca953x gpio access", 284 "device [dev]\n" 285 " - show or set current device address\n" 286 "pca953x info\n" 287 " - display info for current chip\n" 288 "pca953x output pin 0|1\n" 289 " - set pin as output and drive low or high\n" 290 "pca953x invert pin 0|1\n" 291 " - disable/enable polarity inversion for reads\n" 292 "pca953x input pin\n" 293 " - set pin as input and read value" 294); 295 296#endif /* CONFIG_CMD_PCA953X */ 297