mpcsa_leds.c revision 1.9
1 /* $Id: mpcsa_leds.c,v 1.9 2022/01/19 05:21:44 thorpej Exp $ */ 2 /* $NetBSD: mpcsa_leds.c,v 1.9 2022/01/19 05:21:44 thorpej Exp $ */ 3 4 /* 5 * Copyright (c) 2007 Embedtronics Oy. All rights reserved. 6 * 7 * Based on arch/arm/ep93xx/epgpio.c, 8 * Copyright (c) 2005 HAMAJIMA Katsuomi. All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: mpcsa_leds.c,v 1.9 2022/01/19 05:21:44 thorpej Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/device.h> 39 #include <sys/lock.h> 40 #include <sys/gpio.h> 41 #include <dev/spi/spivar.h> 42 #include <dev/gpio/gpiovar.h> 43 #include <evbarm/mpcsa/mpcsa_leds_var.h> 44 #include <evbarm/mpcsa/mpcsa_io.h> 45 #include "gpio.h" 46 #if NGPIO > 0 47 #include <sys/gpio.h> 48 #endif 49 #include "locators.h" 50 51 #ifdef MPCSA_LEDS_DEBUG 52 int mpcsa_leds_debug = MPCSA_LEDS_DEBUG; 53 #define DPRINTFN(n,x) if (mpcsa_leds_debug>(n)) printf x; 54 #else 55 #define DPRINTFN(n,x) 56 #endif 57 58 #define MPCSA_LEDS_NPINS 16 59 #define LEDS_UPDATE_INTERVAL 100 /* update interval in milliseconds */ 60 61 enum { 62 LMODE_NORMAL, /* normal mode */ 63 LMODE_COMM, /* communication mode */ 64 LMODE_BLINK /* blink mode */ 65 }; 66 67 typedef struct led_state { 68 int l_mode; /* current command */ 69 union { 70 struct { 71 int l_conn_cnt; /* connection count */ 72 int l_comm_cnt; /* comm/pkt count */ 73 }; 74 struct { 75 int l_blink_int; /* blink interval */ 76 int l_blink_cnt; /* blink counter */ 77 }; 78 }; 79 } led_state_t; 80 81 struct mpcsa_leds_softc { 82 struct spi_handle *sc_sh; 83 84 #if NGPIO > 0 85 struct gpio_chipset_tag sc_gpio_chipset; 86 gpio_pin_t sc_pins[MPCSA_LEDS_NPINS]; 87 #endif 88 89 callout_t sc_c; 90 led_state_t sc_leds[MPCSA_LEDS_NPINS]; 91 uint16_t sc_pinstate; 92 93 struct spi_chunk sc_spi_chunk; 94 struct spi_transfer sc_spi_transfer; 95 }; 96 97 static int mpcsa_leds_match(device_t , cfdata_t , void *); 98 static void mpcsa_leds_attach(device_t , device_t , void *); 99 static void mpcsa_leds_timer(void *aux); 100 101 #if NGPIO > 0 102 static int mpcsa_ledsbus_print(void *, const char *); 103 static int mpcsa_leds_pin_read(void *, int); 104 static void mpcsa_leds_pin_write(void *, int, int); 105 static void mpcsa_leds_pin_ctl(void *, int, int); 106 #endif 107 108 #if 0 109 static int mpcsa_leds_search(device_t , cfdata_t , const int *, void *); 110 static int mpcsa_leds_print(void *, const char *); 111 #endif 112 113 CFATTACH_DECL_NEW(mpcsa_leds, sizeof(struct mpcsa_leds_softc), 114 mpcsa_leds_match, mpcsa_leds_attach, NULL, NULL); 115 116 static struct mpcsa_leds_softc *mpcsa_leds_sc; 117 118 static int 119 mpcsa_leds_match(device_t parent, cfdata_t match, void *aux) 120 { 121 122 if (strcmp(match->cf_name, "mpcsa_leds")) 123 return 0; 124 125 return 2; 126 } 127 128 static void 129 mpcsa_leds_attach(device_t parent, device_t self, void *aux) 130 { 131 struct mpcsa_leds_softc *sc = device_private(self); 132 struct spi_attach_args *sa = aux; 133 #if NGPIO > 0 134 struct gpiobus_attach_args gba; 135 #endif 136 int n; 137 int error; 138 139 aprint_naive(": output buffer\n"); 140 aprint_normal(": 74HC595 or compatible shift register(s)\n"); 141 142 error = spi_configure(self, sa->sa_handle, SPI_MODE_0, 10000000); 143 if (error) { 144 return; 145 } 146 147 sc->sc_sh = sa->sa_handle; 148 sc->sc_pinstate = 0xffff; 149 callout_init(&sc->sc_c, 0); 150 151 #if NGPIO > 0 152 /* initialize and attach gpio(4) */ 153 for (n = 0; n < MPCSA_LEDS_NPINS; n++) { 154 sc->sc_pins[n].pin_num = n; 155 sc->sc_pins[n].pin_caps = (GPIO_PIN_OUTPUT 156 | GPIO_PIN_PUSHPULL); 157 sc->sc_pins[n].pin_flags = GPIO_PIN_OUTPUT | GPIO_PIN_LOW; 158 } 159 160 sc->sc_gpio_chipset.gp_cookie = sc; 161 sc->sc_gpio_chipset.gp_pin_read = mpcsa_leds_pin_read; 162 sc->sc_gpio_chipset.gp_pin_write = mpcsa_leds_pin_write; 163 sc->sc_gpio_chipset.gp_pin_ctl = mpcsa_leds_pin_ctl; 164 gba.gba_gc = &sc->sc_gpio_chipset; 165 gba.gba_pins = sc->sc_pins; 166 gba.gba_npins = MPCSA_LEDS_NPINS; 167 config_found(self, &gba, mpcsa_ledsbus_print, CFARGS_NONE); 168 #endif 169 170 /* attach device */ 171 // config_search_ia(mpcsa_leds_search, self, "mpcsa_leds", mpcsa_leds_print); 172 173 /* update leds ten times a second or so */ 174 mpcsa_leds_sc = sc; // @@@@ 175 sc->sc_spi_transfer.st_flags = SPI_F_DONE; 176 callout_reset(&sc->sc_c, mstohz(LEDS_UPDATE_INTERVAL), mpcsa_leds_timer, sc); 177 178 mpcsa_blink_led(LED_HB, 500); 179 } 180 181 182 183 184 #if NGPIO > 0 185 static int 186 mpcsa_ledsbus_print(void *aux, const char *name) 187 { 188 gpiobus_print(aux, name); 189 return (UNCONF); 190 } 191 192 193 static int 194 mpcsa_leds_pin_read(void *arg, int pin) 195 { 196 struct mpcsa_leds_softc *sc = arg; 197 pin %= MPCSA_LEDS_NPINS; 198 return (sc->sc_pinstate & htobe16(1U << pin)) ? 1 : 0; 199 } 200 201 static void 202 mpcsa_leds_pin_write(void *arg, int pin, int val) 203 { 204 struct mpcsa_leds_softc *sc = arg; 205 int s; 206 207 pin %= MPCSA_LEDS_NPINS; 208 if (!sc->sc_pins[pin].pin_caps) 209 return; 210 211 s = splserial(); 212 if (val) 213 sc->sc_pinstate |= htobe16(1U << pin); 214 else 215 sc->sc_pinstate &= htobe16(~(1U << pin)); 216 splx(s); 217 218 if (spi_send(sc->sc_sh, 2, (const void *)&sc->sc_pinstate) != 0) { 219 // @@@ do what? @@@ 220 } 221 } 222 223 224 static void 225 mpcsa_leds_pin_ctl(void *arg, int pin, int flags) 226 { 227 struct mpcsa_leds_softc *sc = arg; 228 229 pin %= MPCSA_LEDS_NPINS; 230 if (!sc->sc_pins[pin].pin_caps) 231 return; 232 233 // hmm, I think there's nothing to do 234 } 235 #endif 236 237 static void mpcsa_leds_timer(void *aux) 238 { 239 int n, s; 240 struct mpcsa_leds_softc *sc = aux; 241 uint16_t pins; 242 243 callout_schedule(&sc->sc_c, mstohz(LEDS_UPDATE_INTERVAL)); 244 245 s = splserial(); 246 if (!(sc->sc_spi_transfer.st_flags & SPI_F_DONE)) { 247 splx(s); 248 return; 249 } 250 251 252 pins = be16toh(sc->sc_pinstate); 253 254 for (n = 0; n < MPCSA_LEDS_NPINS; n++) { 255 switch (sc->sc_leds[n].l_mode) { 256 default: 257 continue; 258 259 case LMODE_COMM: 260 if (sc->sc_leds[n].l_comm_cnt > 0) { 261 if (sc->sc_leds[n].l_comm_cnt < INFINITE_BLINK) 262 sc->sc_leds[n].l_comm_cnt--; 263 else 264 sc->sc_leds[n].l_comm_cnt ^= 1; 265 } 266 if ((sc->sc_leds[n].l_conn_cnt > 0) ^ (sc->sc_leds[n].l_comm_cnt & 1)) 267 pins &= ~(1U << n); 268 else 269 pins |= (1U << n); 270 break; 271 272 case LMODE_BLINK: 273 if (--sc->sc_leds[n].l_blink_cnt <= 0) { 274 pins ^= (1U << n); 275 sc->sc_leds[n].l_blink_cnt = sc->sc_leds[n].l_blink_int; 276 } 277 break; 278 } 279 } 280 281 HTOBE16(pins); 282 sc->sc_pinstate = pins; 283 splx(s); 284 285 spi_transfer_init(&sc->sc_spi_transfer); 286 spi_chunk_init(&sc->sc_spi_chunk, 2, (const void *)&sc->sc_pinstate, NULL); 287 spi_transfer_add(&sc->sc_spi_transfer, &sc->sc_spi_chunk); 288 if (spi_transfer(sc->sc_sh, &sc->sc_spi_transfer) != 0) { 289 /* an error occurred! */ 290 } 291 } 292 293 void mpcsa_comm_led(int num, int count) 294 { 295 struct mpcsa_leds_softc *sc = mpcsa_leds_sc; 296 if (!sc || num < 1 || num > MPCSA_LEDS_NPINS) { 297 return; 298 } 299 num--; 300 count *= 2; 301 int s = splserial(); 302 if (sc->sc_leds[num].l_mode != LMODE_COMM) { 303 sc->sc_leds[num].l_mode = LMODE_COMM; 304 sc->sc_leds[num].l_conn_cnt = 0; 305 sc->sc_leds[num].l_comm_cnt = 0; 306 } 307 if (sc->sc_leds[num].l_comm_cnt < (count * 2 - 1)) 308 sc->sc_leds[num].l_comm_cnt += count; 309 else if ((count * 2) < sc->sc_leds[num].l_comm_cnt) 310 sc->sc_leds[num].l_comm_cnt = count * 2 - 2 - (sc->sc_leds[num].l_comm_cnt % 2); 311 splx(s); 312 } 313 314 void mpcsa_conn_led(int num, int ok) 315 { 316 struct mpcsa_leds_softc *sc = mpcsa_leds_sc; 317 if (!sc || num < 1 || num > MPCSA_LEDS_NPINS) 318 return; 319 num--; 320 int s = splserial(); 321 if (sc->sc_leds[num].l_mode != LMODE_COMM) { 322 sc->sc_leds[num].l_mode = LMODE_COMM; 323 sc->sc_leds[num].l_conn_cnt = 0; 324 sc->sc_leds[num].l_comm_cnt = 0; 325 } 326 if (ok) 327 sc->sc_leds[num].l_conn_cnt++; 328 else 329 sc->sc_leds[num].l_conn_cnt--; 330 splx(s); 331 } 332 333 void mpcsa_blink_led(int num, int interval) 334 { 335 struct mpcsa_leds_softc *sc = mpcsa_leds_sc; 336 if (!sc || num < 1 || num > MPCSA_LEDS_NPINS) { 337 return; 338 } 339 interval = (interval + LEDS_UPDATE_INTERVAL + 1) / LEDS_UPDATE_INTERVAL; 340 num--; 341 int s = splserial(); 342 if (sc->sc_leds[num].l_mode != LMODE_COMM) { 343 sc->sc_leds[num].l_mode = LMODE_BLINK; 344 sc->sc_leds[num].l_blink_cnt = interval; 345 } 346 sc->sc_leds[num].l_blink_int = interval; 347 splx(s); 348 } 349
Indexes created Tue Oct 28 09:09:52 GMT 2025