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 <common.h> 12 #include <i2c.h> 13 #include <pca953x.h> 14 15 /* Default to an address that hopefully won't corrupt other i2c devices */ 16 #ifndef CONFIG_SYS_I2C_PCA953X_ADDR 17 #define CONFIG_SYS_I2C_PCA953X_ADDR (~0) 18 #endif 19 20 enum { 21 PCA953X_CMD_INFO, 22 PCA953X_CMD_DEVICE, 23 PCA953X_CMD_OUTPUT, 24 PCA953X_CMD_INPUT, 25 PCA953X_CMD_INVERT, 26 }; 27 28 #ifdef CONFIG_SYS_I2C_PCA953X_WIDTH 29 struct pca953x_chip_ngpio { 30 uint8_t chip; 31 uint8_t ngpio; 32 }; 33 34 static struct pca953x_chip_ngpio pca953x_chip_ngpios[] = 35 CONFIG_SYS_I2C_PCA953X_WIDTH; 36 37 /* 38 * Determine the number of GPIO pins supported. If we don't know we assume 39 * 8 pins. 40 */ 41 static int pca953x_ngpio(uint8_t chip) 42 { 43 int i; 44 45 for (i = 0; i < ARRAY_SIZE(pca953x_chip_ngpios); i++) 46 if (pca953x_chip_ngpios[i].chip == chip) 47 return pca953x_chip_ngpios[i].ngpio; 48 49 return 8; 50 } 51 #else 52 static int pca953x_ngpio(uint8_t chip) 53 { 54 return 8; 55 } 56 #endif 57 58 /* 59 * Modify masked bits in register 60 */ 61 static int pca953x_reg_write(uint8_t chip, uint addr, uint mask, uint data) 62 { 63 uint8_t valb; 64 uint16_t valw; 65 66 if (pca953x_ngpio(chip) <= 8) { 67 if (i2c_read(chip, addr, 1, &valb, 1)) 68 return -1; 69 70 valb &= ~mask; 71 valb |= data; 72 73 return i2c_write(chip, addr, 1, &valb, 1); 74 } else { 75 if (i2c_read(chip, addr << 1, 1, (u8*)&valw, 2)) 76 return -1; 77 78 valw = le16_to_cpu(valw); 79 valw &= ~mask; 80 valw |= data; 81 valw = cpu_to_le16(valw); 82 83 return i2c_write(chip, addr << 1, 1, (u8*)&valw, 2); 84 } 85 } 86 87 static int pca953x_reg_read(uint8_t chip, uint addr, uint *data) 88 { 89 uint8_t valb; 90 uint16_t valw; 91 92 if (pca953x_ngpio(chip) <= 8) { 93 if (i2c_read(chip, addr, 1, &valb, 1)) 94 return -1; 95 *data = (int)valb; 96 } else { 97 if (i2c_read(chip, addr << 1, 1, (u8*)&valw, 2)) 98 return -1; 99 *data = (uint)le16_to_cpu(valw); 100 } 101 return 0; 102 } 103 104 /* 105 * Set output value of IO pins in 'mask' to corresponding value in 'data' 106 * 0 = low, 1 = high 107 */ 108 int pca953x_set_val(uint8_t chip, uint mask, uint data) 109 { 110 return pca953x_reg_write(chip, PCA953X_OUT, mask, data); 111 } 112 113 /* 114 * Set read polarity of IO pins in 'mask' to corresponding value in 'data' 115 * 0 = read pin value, 1 = read inverted pin value 116 */ 117 int pca953x_set_pol(uint8_t chip, uint mask, uint data) 118 { 119 return pca953x_reg_write(chip, PCA953X_POL, mask, data); 120 } 121 122 /* 123 * Set direction of IO pins in 'mask' to corresponding value in 'data' 124 * 0 = output, 1 = input 125 */ 126 int pca953x_set_dir(uint8_t chip, uint mask, uint data) 127 { 128 return pca953x_reg_write(chip, PCA953X_CONF, mask, data); 129 } 130 131 /* 132 * Read current logic level of all IO pins 133 */ 134 int pca953x_get_val(uint8_t chip) 135 { 136 uint val; 137 138 if (pca953x_reg_read(chip, PCA953X_IN, &val) < 0) 139 return -1; 140 141 return (int)val; 142 } 143 144 #if defined(CONFIG_CMD_PCA953X) && !defined(CONFIG_SPL_BUILD) 145 /* 146 * Display pca953x information 147 */ 148 static int pca953x_info(uint8_t chip) 149 { 150 int i; 151 uint data; 152 int nr_gpio = pca953x_ngpio(chip); 153 int msb = nr_gpio - 1; 154 155 printf("pca953x@ 0x%x (%d pins):\n\n", chip, nr_gpio); 156 printf("gpio pins: "); 157 for (i = msb; i >= 0; i--) 158 printf("%x", i); 159 printf("\n"); 160 for (i = 11 + nr_gpio; i > 0; i--) 161 printf("-"); 162 printf("\n"); 163 164 if (pca953x_reg_read(chip, PCA953X_CONF, &data) < 0) 165 return -1; 166 printf("conf: "); 167 for (i = msb; i >= 0; i--) 168 printf("%c", data & (1 << i) ? 'i' : 'o'); 169 printf("\n"); 170 171 if (pca953x_reg_read(chip, PCA953X_POL, &data) < 0) 172 return -1; 173 printf("invert: "); 174 for (i = msb; i >= 0; i--) 175 printf("%c", data & (1 << i) ? '1' : '0'); 176 printf("\n"); 177 178 if (pca953x_reg_read(chip, PCA953X_IN, &data) < 0) 179 return -1; 180 printf("input: "); 181 for (i = msb; i >= 0; i--) 182 printf("%c", data & (1 << i) ? '1' : '0'); 183 printf("\n"); 184 185 if (pca953x_reg_read(chip, PCA953X_OUT, &data) < 0) 186 return -1; 187 printf("output: "); 188 for (i = msb; i >= 0; i--) 189 printf("%c", data & (1 << i) ? '1' : '0'); 190 printf("\n"); 191 192 return 0; 193 } 194 195 static cmd_tbl_t cmd_pca953x[] = { 196 U_BOOT_CMD_MKENT(device, 3, 0, (void *)PCA953X_CMD_DEVICE, "", ""), 197 U_BOOT_CMD_MKENT(output, 4, 0, (void *)PCA953X_CMD_OUTPUT, "", ""), 198 U_BOOT_CMD_MKENT(input, 3, 0, (void *)PCA953X_CMD_INPUT, "", ""), 199 U_BOOT_CMD_MKENT(invert, 4, 0, (void *)PCA953X_CMD_INVERT, "", ""), 200 U_BOOT_CMD_MKENT(info, 2, 0, (void *)PCA953X_CMD_INFO, "", ""), 201 }; 202 203 static int do_pca953x(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 204 { 205 static uint8_t chip = CONFIG_SYS_I2C_PCA953X_ADDR; 206 int ret = CMD_RET_USAGE, val; 207 ulong ul_arg2 = 0; 208 ulong ul_arg3 = 0; 209 cmd_tbl_t *c; 210 211 c = find_cmd_tbl(argv[1], cmd_pca953x, ARRAY_SIZE(cmd_pca953x)); 212 213 /* All commands but "device" require 'maxargs' arguments */ 214 if (!c || !((argc == (c->maxargs)) || 215 (((long)c->cmd == PCA953X_CMD_DEVICE) && 216 (argc == (c->maxargs - 1))))) { 217 return CMD_RET_USAGE; 218 } 219 220 /* arg2 used as chip number or pin number */ 221 if (argc > 2) 222 ul_arg2 = simple_strtoul(argv[2], NULL, 16); 223 224 /* arg3 used as pin or invert value */ 225 if (argc > 3) 226 ul_arg3 = simple_strtoul(argv[3], NULL, 16) & 0x1; 227 228 switch ((long)c->cmd) { 229 case PCA953X_CMD_INFO: 230 ret = pca953x_info(chip); 231 if (ret) 232 ret = CMD_RET_FAILURE; 233 break; 234 235 case PCA953X_CMD_DEVICE: 236 if (argc == 3) 237 chip = (uint8_t)ul_arg2; 238 printf("Current device address: 0x%x\n", chip); 239 ret = CMD_RET_SUCCESS; 240 break; 241 242 case PCA953X_CMD_INPUT: 243 ret = pca953x_set_dir(chip, (1 << ul_arg2), 244 PCA953X_DIR_IN << ul_arg2); 245 val = (pca953x_get_val(chip) & (1 << ul_arg2)) != 0; 246 247 if (ret) 248 ret = CMD_RET_FAILURE; 249 else 250 printf("chip 0x%02x, pin 0x%lx = %d\n", chip, ul_arg2, 251 val); 252 break; 253 254 case PCA953X_CMD_OUTPUT: 255 ret = pca953x_set_dir(chip, (1 << ul_arg2), 256 (PCA953X_DIR_OUT << ul_arg2)); 257 if (!ret) 258 ret = pca953x_set_val(chip, (1 << ul_arg2), 259 (ul_arg3 << ul_arg2)); 260 if (ret) 261 ret = CMD_RET_FAILURE; 262 break; 263 264 case PCA953X_CMD_INVERT: 265 ret = pca953x_set_pol(chip, (1 << ul_arg2), 266 (ul_arg3 << ul_arg2)); 267 if (ret) 268 ret = CMD_RET_FAILURE; 269 break; 270 } 271 272 if (ret == CMD_RET_FAILURE) 273 eprintf("Error talking to chip at 0x%x\n", chip); 274 275 return ret; 276 } 277 278 U_BOOT_CMD( 279 pca953x, 5, 1, do_pca953x, 280 "pca953x gpio access", 281 "device [dev]\n" 282 " - show or set current device address\n" 283 "pca953x info\n" 284 " - display info for current chip\n" 285 "pca953x output pin 0|1\n" 286 " - set pin as output and drive low or high\n" 287 "pca953x invert pin 0|1\n" 288 " - disable/enable polarity inversion for reads\n" 289 "pca953x input pin\n" 290 " - set pin as input and read value" 291 ); 292 293 #endif /* CONFIG_CMD_PCA953X */ 294
