1 /* 2 * Copyright 2008 Extreme Engineering Solutions, Inc. 3 * 4 * SPDX-License-Identifier: GPL-2.0 5 */ 6 7 /* 8 * Driver for NXP's 4, 8 and 16 bit I2C gpio expanders (eg pca9537, pca9557, 9 * pca9539, etc) 10 */ 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 21 enum { 22 PCA953X_CMD_INFO, 23 PCA953X_CMD_DEVICE, 24 PCA953X_CMD_OUTPUT, 25 PCA953X_CMD_INPUT, 26 PCA953X_CMD_INVERT, 27 }; 28 29 #ifdef CONFIG_SYS_I2C_PCA953X_WIDTH 30 struct pca953x_chip_ngpio { 31 uint8_t chip; 32 uint8_t ngpio; 33 }; 34 35 static struct pca953x_chip_ngpio pca953x_chip_ngpios[] = 36 CONFIG_SYS_I2C_PCA953X_WIDTH; 37 38 /* 39 * Determine the number of GPIO pins supported. If we don't know we assume 40 * 8 pins. 41 */ 42 static int pca953x_ngpio(uint8_t chip) 43 { 44 int i; 45 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; 49 50 return 8; 51 } 52 #else 53 static int pca953x_ngpio(uint8_t chip) 54 { 55 return 8; 56 } 57 #endif 58 59 /* 60 * Modify masked bits in register 61 */ 62 static int pca953x_reg_write(uint8_t chip, uint addr, uint mask, uint data) 63 { 64 uint8_t valb; 65 uint16_t valw; 66 67 if (pca953x_ngpio(chip) <= 8) { 68 if (i2c_read(chip, addr, 1, &valb, 1)) 69 return -1; 70 71 valb &= ~mask; 72 valb |= data; 73 74 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 79 valw = le16_to_cpu(valw); 80 valw &= ~mask; 81 valw |= data; 82 valw = cpu_to_le16(valw); 83 84 return i2c_write(chip, addr << 1, 1, (u8*)&valw, 2); 85 } 86 } 87 88 static 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; 100 *data = (uint)le16_to_cpu(valw); 101 } 102 return 0; 103 } 104 105 /* 106 * Set output value of IO pins in 'mask' to corresponding value in 'data' 107 * 0 = low, 1 = high 108 */ 109 int 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 */ 118 int 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 */ 127 int 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 */ 135 int pca953x_get_val(uint8_t chip) 136 { 137 uint val; 138 139 if (pca953x_reg_read(chip, PCA953X_IN, &val) < 0) 140 return -1; 141 142 return (int)val; 143 } 144 145 #ifdef CONFIG_CMD_PCA953X 146 /* 147 * Display pca953x information 148 */ 149 static int pca953x_info(uint8_t chip) 150 { 151 int i; 152 uint data; 153 int nr_gpio = pca953x_ngpio(chip); 154 int msb = nr_gpio - 1; 155 156 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"); 164 165 if (pca953x_reg_read(chip, PCA953X_CONF, &data) < 0) 166 return -1; 167 printf("conf: "); 168 for (i = msb; i >= 0; i--) 169 printf("%c", data & (1 << i) ? 'i' : 'o'); 170 printf("\n"); 171 172 if (pca953x_reg_read(chip, PCA953X_POL, &data) < 0) 173 return -1; 174 printf("invert: "); 175 for (i = msb; i >= 0; i--) 176 printf("%c", data & (1 << i) ? '1' : '0'); 177 printf("\n"); 178 179 if (pca953x_reg_read(chip, PCA953X_IN, &data) < 0) 180 return -1; 181 printf("input: "); 182 for (i = msb; i >= 0; i--) 183 printf("%c", data & (1 << i) ? '1' : '0'); 184 printf("\n"); 185 186 if (pca953x_reg_read(chip, PCA953X_OUT, &data) < 0) 187 return -1; 188 printf("output: "); 189 for (i = msb; i >= 0; i--) 190 printf("%c", data & (1 << i) ? '1' : '0'); 191 printf("\n"); 192 193 return 0; 194 } 195 196 cmd_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, "", ""), 201 U_BOOT_CMD_MKENT(info, 2, 0, (void *)PCA953X_CMD_INFO, "", ""), 202 }; 203 204 int do_pca953x(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 205 { 206 static uint8_t chip = CONFIG_SYS_I2C_PCA953X_ADDR; 207 int ret = CMD_RET_USAGE, val; 208 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)) || 216 (((long)c->cmd == PCA953X_CMD_DEVICE) && 217 (argc == (c->maxargs - 1))))) { 218 return CMD_RET_USAGE; 219 } 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; 228 229 switch ((long)c->cmd) { 230 case PCA953X_CMD_INFO: 231 ret = pca953x_info(chip); 232 if (ret) 233 ret = CMD_RET_FAILURE; 234 break; 235 236 case PCA953X_CMD_DEVICE: 237 if (argc == 3) 238 chip = (uint8_t)ul_arg2; 239 printf("Current device address: 0x%x\n", chip); 240 ret = CMD_RET_SUCCESS; 241 break; 242 243 case PCA953X_CMD_INPUT: 244 ret = pca953x_set_dir(chip, (1 << ul_arg2), 245 PCA953X_DIR_IN << ul_arg2); 246 val = (pca953x_get_val(chip) & (1 << ul_arg2)) != 0; 247 248 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; 254 255 case PCA953X_CMD_OUTPUT: 256 ret = pca953x_set_dir(chip, (1 << ul_arg2), 257 (PCA953X_DIR_OUT << ul_arg2)); 258 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; 264 265 case PCA953X_CMD_INVERT: 266 ret = pca953x_set_pol(chip, (1 << ul_arg2), 267 (ul_arg3 << ul_arg2)); 268 if (ret) 269 ret = CMD_RET_FAILURE; 270 break; 271 } 272 273 if (ret == CMD_RET_FAILURE) 274 eprintf("Error talking to chip at 0x%x\n", chip); 275 276 return ret; 277 } 278 279 U_BOOT_CMD( 280 pca953x, 5, 1, do_pca953x, 281 "pca953x gpio access", 282 "device [dev]\n" 283 " - show or set current device address\n" 284 "pca953x info\n" 285 " - display info for current chip\n" 286 "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" 290 "pca953x input pin\n" 291 " - set pin as input and read value" 292 ); 293 294 #endif /* CONFIG_CMD_PCA953X */ 295