mpcsa_leds.c revision 1.4
1 /* $Id: mpcsa_leds.c,v 1.4 2012/10/27 17:17:48 chs Exp $ */ 2 /* $NetBSD: mpcsa_leds.c,v 1.4 2012/10/27 17:17:48 chs 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 1.4 2012/10/27 17:17:48 chs 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 struct spi_attach_args *sa = aux; 122 123 if (strcmp(match->cf_name, "mpcsa_leds")) 124 return 0; 125 126 if (spi_configure(sa->sa_handle, SPI_MODE_0, 10000000)) 127 return 0; 128 129 return 2; 130 } 131 132 static void 133 mpcsa_leds_attach(device_t parent, device_t self, void *aux) 134 { 135 struct mpcsa_leds_softc *sc = device_private(self); 136 struct spi_attach_args *sa = aux; 137 #if NGPIO > 0 138 struct gpiobus_attach_args gba; 139 #endif 140 int n; 141 142 aprint_naive(": output buffer\n"); 143 aprint_normal(": 74HC595 or compatible shift register(s)\n"); 144 145 sc->sc_sh = sa->sa_handle; 146 sc->sc_pinstate = 0xffff; 147 callout_init(&sc->sc_c, 0); 148 149 #if NGPIO > 0 150 /* initialize and attach gpio(4) */ 151 for (n = 0; n < MPCSA_LEDS_NPINS; n++) { 152 sc->sc_pins[n].pin_num = n; 153 sc->sc_pins[n].pin_caps = (GPIO_PIN_OUTPUT 154 | GPIO_PIN_PUSHPULL); 155 sc->sc_pins[n].pin_flags = GPIO_PIN_OUTPUT | GPIO_PIN_LOW; 156 } 157 158 sc->sc_gpio_chipset.gp_cookie = sc; 159 sc->sc_gpio_chipset.gp_pin_read = mpcsa_leds_pin_read; 160 sc->sc_gpio_chipset.gp_pin_write = mpcsa_leds_pin_write; 161 sc->sc_gpio_chipset.gp_pin_ctl = mpcsa_leds_pin_ctl; 162 gba.gba_gc = &sc->sc_gpio_chipset; 163 gba.gba_pins = sc->sc_pins; 164 gba.gba_npins = MPCSA_LEDS_NPINS; 165 config_found_ia(self, "gpiobus", &gba, mpcsa_ledsbus_print); 166 #endif 167 168 /* attach device */ 169 // config_search_ia(mpcsa_leds_search, self, "mpcsa_leds", mpcsa_leds_print); 170 171 /* update leds ten times a second or so */ 172 mpcsa_leds_sc = sc; // @@@@ 173 sc->sc_spi_transfer.st_flags = SPI_F_DONE; 174 callout_reset(&sc->sc_c, mstohz(LEDS_UPDATE_INTERVAL), mpcsa_leds_timer, sc); 175 176 mpcsa_blink_led(LED_HB, 500); 177 } 178 179 180 181 182 #if NGPIO > 0 183 static int 184 mpcsa_ledsbus_print(void *aux, const char *name) 185 { 186 gpiobus_print(aux, name); 187 return (UNCONF); 188 } 189 190 191 static int 192 mpcsa_leds_pin_read(void *arg, int pin) 193 { 194 struct mpcsa_leds_softc *sc = arg; 195 pin %= MPCSA_LEDS_NPINS; 196 return (sc->sc_pinstate & htobe16(1U << pin)) ? 1 : 0; 197 } 198 199 static void 200 mpcsa_leds_pin_write(void *arg, int pin, int val) 201 { 202 struct mpcsa_leds_softc *sc = arg; 203 int s; 204 205 pin %= MPCSA_LEDS_NPINS; 206 if (!sc->sc_pins[pin].pin_caps) 207 return; 208 209 s = splserial(); 210 if (val) 211 sc->sc_pinstate |= htobe16(1U << pin); 212 else 213 sc->sc_pinstate &= htobe16(~(1U << pin)); 214 splx(s); 215 216 if (spi_send(sc->sc_sh, 2, (const void *)&sc->sc_pinstate) != 0) { 217 // @@@ do what? @@@ 218 } 219 } 220 221 222 static void 223 mpcsa_leds_pin_ctl(void *arg, int pin, int flags) 224 { 225 struct mpcsa_leds_softc *sc = arg; 226 227 pin %= MPCSA_LEDS_NPINS; 228 if (!sc->sc_pins[pin].pin_caps) 229 return; 230 231 // hmm, I think there's nothing to do 232 } 233 #endif 234 235 static void mpcsa_leds_timer(void *aux) 236 { 237 int n, s; 238 struct mpcsa_leds_softc *sc = aux; 239 u_int16_t pins; 240 241 callout_schedule(&sc->sc_c, mstohz(LEDS_UPDATE_INTERVAL)); 242 243 s = splserial(); 244 if (!(sc->sc_spi_transfer.st_flags & SPI_F_DONE)) { 245 splx(s); 246 return; 247 } 248 249 250 pins = be16toh(sc->sc_pinstate); 251 252 for (n = 0; n < MPCSA_LEDS_NPINS; n++) { 253 switch (sc->sc_leds[n].l_mode) { 254 default: 255 continue; 256 257 case LMODE_COMM: 258 if (sc->sc_leds[n].l_comm_cnt > 0) { 259 if (sc->sc_leds[n].l_comm_cnt < INFINITE_BLINK) 260 sc->sc_leds[n].l_comm_cnt--; 261 else 262 sc->sc_leds[n].l_comm_cnt ^= 1; 263 } 264 if ((sc->sc_leds[n].l_conn_cnt > 0) ^ (sc->sc_leds[n].l_comm_cnt & 1)) 265 pins &= ~(1U << n); 266 else 267 pins |= (1U << n); 268 break; 269 270 case LMODE_BLINK: 271 if (--sc->sc_leds[n].l_blink_cnt <= 0) { 272 pins ^= (1U << n); 273 sc->sc_leds[n].l_blink_cnt = sc->sc_leds[n].l_blink_int; 274 } 275 break; 276 } 277 } 278 279 HTOBE16(pins); 280 sc->sc_pinstate = pins; 281 splx(s); 282 283 spi_transfer_init(&sc->sc_spi_transfer); 284 spi_chunk_init(&sc->sc_spi_chunk, 2, (const void *)&sc->sc_pinstate, NULL); 285 spi_transfer_add(&sc->sc_spi_transfer, &sc->sc_spi_chunk); 286 if (spi_transfer(sc->sc_sh, &sc->sc_spi_transfer) != 0) { 287 /* an error occurred! */ 288 } 289 } 290 291 void mpcsa_comm_led(int num, int count) 292 { 293 struct mpcsa_leds_softc *sc = mpcsa_leds_sc; 294 if (!sc || num < 1 || num > MPCSA_LEDS_NPINS) { 295 return; 296 } 297 num--; 298 count *= 2; 299 int s = splserial(); 300 if (sc->sc_leds[num].l_mode != LMODE_COMM) { 301 sc->sc_leds[num].l_mode = LMODE_COMM; 302 sc->sc_leds[num].l_conn_cnt = 0; 303 sc->sc_leds[num].l_comm_cnt = 0; 304 } 305 if (sc->sc_leds[num].l_comm_cnt < (count * 2 - 1)) 306 sc->sc_leds[num].l_comm_cnt += count; 307 else if ((count * 2) < sc->sc_leds[num].l_comm_cnt) 308 sc->sc_leds[num].l_comm_cnt = count * 2 - 2 - (sc->sc_leds[num].l_comm_cnt % 2); 309 splx(s); 310 } 311 312 void mpcsa_conn_led(int num, int ok) 313 { 314 struct mpcsa_leds_softc *sc = mpcsa_leds_sc; 315 if (!sc || num < 1 || num > MPCSA_LEDS_NPINS) 316 return; 317 num--; 318 int s = splserial(); 319 if (sc->sc_leds[num].l_mode != LMODE_COMM) { 320 sc->sc_leds[num].l_mode = LMODE_COMM; 321 sc->sc_leds[num].l_conn_cnt = 0; 322 sc->sc_leds[num].l_comm_cnt = 0; 323 } 324 if (ok) 325 sc->sc_leds[num].l_conn_cnt++; 326 else 327 sc->sc_leds[num].l_conn_cnt--; 328 splx(s); 329 } 330 331 void mpcsa_blink_led(int num, int interval) 332 { 333 struct mpcsa_leds_softc *sc = mpcsa_leds_sc; 334 if (!sc || num < 1 || num > MPCSA_LEDS_NPINS) { 335 return; 336 } 337 interval = (interval + LEDS_UPDATE_INTERVAL + 1) / LEDS_UPDATE_INTERVAL; 338 num--; 339 int s = splserial(); 340 if (sc->sc_leds[num].l_mode != LMODE_COMM) { 341 sc->sc_leds[num].l_mode = LMODE_BLINK; 342 sc->sc_leds[num].l_blink_cnt = interval; 343 } 344 sc->sc_leds[num].l_blink_int = interval; 345 splx(s); 346 } 347
Indexes created Mon Sep 29 21:09:56 GMT 2025