2 * National Semiconductor LM8322/8323 GPIO keyboard & PWM chips.
4 * Copyright (C) 2008 Nokia Corporation
5 * Written by Andrzej Zaborowski <andrew@openedhand.com>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 or
10 * (at your option) version 3 of the License.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25 #include "qemu-timer.h"
72 #define INT_KEYPAD (1 << 0)
73 #define INT_ERROR (1 << 3)
74 #define INT_NOINIT (1 << 4)
75 #define INT_PWMEND(n) (1 << (5 + n))
77 #define ERR_BADPAR (1 << 0)
78 #define ERR_CMDUNK (1 << 1)
79 #define ERR_KEYOVR (1 << 2)
80 #define ERR_FIFOOVR (1 << 6)
82 static void lm_kbd_irq_update(struct lm_kbd_s *s)
84 qemu_set_irq(s->nirq, !s->status);
87 static void lm_kbd_gpio_update(struct lm_kbd_s *s)
91 static void lm_kbd_reset(struct lm_kbd_s *s)
94 s->status = INT_NOINIT;
100 lm_kbd_irq_update(s);
101 lm_kbd_gpio_update(s);
104 static void lm_kbd_error(struct lm_kbd_s *s, int err)
107 s->status |= INT_ERROR;
108 lm_kbd_irq_update(s);
111 static void lm_kbd_pwm_tick(struct lm_kbd_s *s, int line)
115 static void lm_kbd_pwm_start(struct lm_kbd_s *s, int line)
117 lm_kbd_pwm_tick(s, line);
120 static void lm_kbd_pwm0_tick(void *opaque)
122 lm_kbd_pwm_tick(opaque, 0);
124 static void lm_kbd_pwm1_tick(void *opaque)
126 lm_kbd_pwm_tick(opaque, 1);
128 static void lm_kbd_pwm2_tick(void *opaque)
130 lm_kbd_pwm_tick(opaque, 2);
134 LM832x_CMD_READ_ID = 0x80, /* Read chip ID. */
135 LM832x_CMD_WRITE_CFG = 0x81, /* Set configuration item. */
136 LM832x_CMD_READ_INT = 0x82, /* Get interrupt status. */
137 LM832x_CMD_RESET = 0x83, /* Reset, same as external one */
138 LM823x_CMD_WRITE_PULL_DOWN = 0x84, /* Select GPIO pull-up/down. */
139 LM832x_CMD_WRITE_PORT_SEL = 0x85, /* Select GPIO in/out. */
140 LM832x_CMD_WRITE_PORT_STATE = 0x86, /* Set GPIO pull-up/down. */
141 LM832x_CMD_READ_PORT_SEL = 0x87, /* Get GPIO in/out. */
142 LM832x_CMD_READ_PORT_STATE = 0x88, /* Get GPIO pull-up/down. */
143 LM832x_CMD_READ_FIFO = 0x89, /* Read byte from FIFO. */
144 LM832x_CMD_RPT_READ_FIFO = 0x8a, /* Read FIFO (no increment). */
145 LM832x_CMD_SET_ACTIVE = 0x8b, /* Set active time. */
146 LM832x_CMD_READ_ERROR = 0x8c, /* Get error status. */
147 LM832x_CMD_READ_ROTATOR = 0x8e, /* Read rotator status. */
148 LM832x_CMD_SET_DEBOUNCE = 0x8f, /* Set debouncing time. */
149 LM832x_CMD_SET_KEY_SIZE = 0x90, /* Set keypad size. */
150 LM832x_CMD_READ_KEY_SIZE = 0x91, /* Get keypad size. */
151 LM832x_CMD_READ_CFG = 0x92, /* Get configuration item. */
152 LM832x_CMD_WRITE_CLOCK = 0x93, /* Set clock config. */
153 LM832x_CMD_READ_CLOCK = 0x94, /* Get clock config. */
154 LM832x_CMD_PWM_WRITE = 0x95, /* Write PWM script. */
155 LM832x_CMD_PWM_START = 0x96, /* Start PWM engine. */
156 LM832x_CMD_PWM_STOP = 0x97, /* Stop PWM engine. */
159 #define LM832x_MAX_KPX 8
160 #define LM832x_MAX_KPY 12
162 static uint8_t lm_kbd_read(struct lm_kbd_s *s, int reg, int byte)
167 case LM832x_CMD_READ_ID:
171 case LM832x_CMD_READ_INT:
173 if (!(s->status & INT_NOINIT)) {
175 lm_kbd_irq_update(s);
179 case LM832x_CMD_READ_PORT_SEL:
182 case LM832x_CMD_READ_PORT_STATE:
186 case LM832x_CMD_READ_FIFO:
190 /* Example response from the two commands after a INT_KEYPAD
191 * interrupt caused by the key 0x3c being pressed:
192 * RPT_READ_FIFO: 55 bc 00 4e ff 0a 50 08 00 29 d9 08 01 c9 01
193 * READ_FIFO: bc 00 00 4e ff 0a 50 08 00 29 d9 08 01 c9 01
194 * RPT_READ_FIFO: bc 00 00 4e ff 0a 50 08 00 29 d9 08 01 c9 01
196 * 55 is the code of the key release event serviced in the previous
197 * interrupt handling.
199 * TODO: find out whether the FIFO is advanced a single character
200 * before reading every byte or the whole size of the FIFO at the
201 * last LM832x_CMD_READ_FIFO. This affects LM832x_CMD_RPT_READ_FIFO
202 * output in cases where there are more than one event in the FIFO.
203 * Assume 0xbc and 0x3c events are in the FIFO:
204 * RPT_READ_FIFO: 55 bc 3c 00 4e ff 0a 50 08 00 29 d9 08 01 c9
205 * READ_FIFO: bc 3c 00 00 4e ff 0a 50 08 00 29 d9 08 01 c9
206 * Does RPT_READ_FIFO now return 0xbc and 0x3c or only 0x3c?
209 s->kbd.start &= sizeof(s->kbd.fifo) - 1;
212 return s->kbd.fifo[s->kbd.start];
213 case LM832x_CMD_RPT_READ_FIFO:
214 if (byte >= s->kbd.len)
217 return s->kbd.fifo[(s->kbd.start + byte) & (sizeof(s->kbd.fifo) - 1)];
219 case LM832x_CMD_READ_ERROR:
222 case LM832x_CMD_READ_ROTATOR:
225 case LM832x_CMD_READ_KEY_SIZE:
228 case LM832x_CMD_READ_CFG:
229 return s->config & 0xf;
231 case LM832x_CMD_READ_CLOCK:
232 return (s->clock & 0xfc) | 2;
235 lm_kbd_error(s, ERR_CMDUNK);
236 fprintf(stderr, "%s: unknown command %02x\n", __FUNCTION__, reg);
240 return ret >> (byte << 3);
243 static void lm_kbd_write(struct lm_kbd_s *s, int reg, int byte, uint8_t value)
246 case LM832x_CMD_WRITE_CFG:
248 /* This must be done whenever s->mux.in is updated (never). */
249 if ((s->config >> 1) & 1) /* MUX1EN */
250 qemu_set_irq(s->mux.out[0], s->mux.in[0][(s->config >> 0) & 1]);
251 if ((s->config >> 3) & 1) /* MUX2EN */
252 qemu_set_irq(s->mux.out[0], s->mux.in[0][(s->config >> 2) & 1]);
253 /* TODO: check that this is issued only following the chip reset
254 * and not in the middle of operation and that it is followed by
255 * the GPIO ports re-resablishing through WRITE_PORT_SEL and
256 * WRITE_PORT_STATE (using a timer perhaps) and otherwise output
259 lm_kbd_irq_update(s);
265 case LM832x_CMD_RESET:
269 lm_kbd_error(s, ERR_BADPAR);
273 case LM823x_CMD_WRITE_PULL_DOWN:
275 s->gpio.pull = value;
277 s->gpio.pull |= value << 8;
278 lm_kbd_gpio_update(s);
282 case LM832x_CMD_WRITE_PORT_SEL:
286 s->gpio.dir |= value << 8;
287 lm_kbd_gpio_update(s);
291 case LM832x_CMD_WRITE_PORT_STATE:
293 s->gpio.mask = value;
295 s->gpio.mask |= value << 8;
296 lm_kbd_gpio_update(s);
301 case LM832x_CMD_SET_ACTIVE:
306 case LM832x_CMD_SET_DEBOUNCE:
307 s->kbd.dbnctime = value;
310 lm_kbd_error(s, ERR_BADPAR);
313 case LM832x_CMD_SET_KEY_SIZE:
317 (value & 0xf) < 3 || (value & 0xf) > LM832x_MAX_KPY ||
318 (value >> 4) < 3 || (value >> 4) > LM832x_MAX_KPX)
319 lm_kbd_error(s, ERR_BADPAR);
322 case LM832x_CMD_WRITE_CLOCK:
325 if ((value & 3) && (value & 3) != 3) {
326 lm_kbd_error(s, ERR_BADPAR);
327 fprintf(stderr, "%s: invalid clock setting in RCPWM\n",
330 /* TODO: Validate that the command is only issued once */
333 case LM832x_CMD_PWM_WRITE:
335 if (!(value & 3) || (value >> 2) > 59) {
336 lm_kbd_error(s, ERR_BADPAR);
341 s->pwm.faddr = value;
342 s->pwm.file[s->pwm.faddr] = 0;
343 } else if (byte == 1) {
344 s->pwm.file[s->pwm.faddr] |= value << 8;
345 } else if (byte == 2) {
346 s->pwm.file[s->pwm.faddr] |= value << 0;
350 case LM832x_CMD_PWM_START:
352 if (!(value & 3) || (value >> 2) > 59) {
353 lm_kbd_error(s, ERR_BADPAR);
357 s->pwm.addr[(value & 3) - 1] = value >> 2;
358 lm_kbd_pwm_start(s, (value & 3) - 1);
360 case LM832x_CMD_PWM_STOP:
363 lm_kbd_error(s, ERR_BADPAR);
367 qemu_del_timer(s->pwm.tm[(value & 3) - 1]);
371 lm_kbd_error(s, ERR_BADPAR);
374 lm_kbd_error(s, ERR_CMDUNK);
375 fprintf(stderr, "%s: unknown command %02x\n", __FUNCTION__, reg);
380 static void lm_i2c_event(i2c_slave *i2c, enum i2c_event event)
382 struct lm_kbd_s *s = (struct lm_kbd_s *) i2c;
388 s->i2c_dir = (event == I2C_START_SEND);
396 static int lm_i2c_rx(i2c_slave *i2c)
398 struct lm_kbd_s *s = (struct lm_kbd_s *) i2c;
400 return lm_kbd_read(s, s->reg, s->i2c_cycle ++);
403 static int lm_i2c_tx(i2c_slave *i2c, uint8_t data)
405 struct lm_kbd_s *s = (struct lm_kbd_s *) i2c;
410 lm_kbd_write(s, s->reg, s->i2c_cycle - 1, data);
416 static void lm_kbd_save(QEMUFile *f, void *opaque)
418 struct lm_kbd_s *s = (struct lm_kbd_s *) opaque;
421 i2c_slave_save(f, &s->i2c);
422 qemu_put_byte(f, s->i2c_dir);
423 qemu_put_byte(f, s->i2c_cycle);
424 qemu_put_byte(f, (uint8_t) s->reg);
426 qemu_put_8s(f, &s->config);
427 qemu_put_8s(f, &s->status);
428 qemu_put_8s(f, &s->acttime);
429 qemu_put_8s(f, &s->error);
430 qemu_put_8s(f, &s->clock);
432 qemu_put_be16s(f, &s->gpio.pull);
433 qemu_put_be16s(f, &s->gpio.mask);
434 qemu_put_be16s(f, &s->gpio.dir);
435 qemu_put_be16s(f, &s->gpio.level);
437 qemu_put_byte(f, s->kbd.dbnctime);
438 qemu_put_byte(f, s->kbd.size);
439 qemu_put_byte(f, s->kbd.start);
440 qemu_put_byte(f, s->kbd.len);
441 qemu_put_buffer(f, s->kbd.fifo, sizeof(s->kbd.fifo));
443 for (i = 0; i < sizeof(s->pwm.file); i ++)
444 qemu_put_be16s(f, &s->pwm.file[i]);
445 qemu_put_8s(f, &s->pwm.faddr);
446 qemu_put_buffer(f, s->pwm.addr, sizeof(s->pwm.addr));
447 qemu_put_timer(f, s->pwm.tm[0]);
448 qemu_put_timer(f, s->pwm.tm[1]);
449 qemu_put_timer(f, s->pwm.tm[2]);
452 static int lm_kbd_load(QEMUFile *f, void *opaque, int version_id)
454 struct lm_kbd_s *s = (struct lm_kbd_s *) opaque;
457 i2c_slave_load(f, &s->i2c);
458 s->i2c_dir = qemu_get_byte(f);
459 s->i2c_cycle = qemu_get_byte(f);
460 s->reg = (int8_t) qemu_get_byte(f);
462 qemu_get_8s(f, &s->config);
463 qemu_get_8s(f, &s->status);
464 qemu_get_8s(f, &s->acttime);
465 qemu_get_8s(f, &s->error);
466 qemu_get_8s(f, &s->clock);
468 qemu_get_be16s(f, &s->gpio.pull);
469 qemu_get_be16s(f, &s->gpio.mask);
470 qemu_get_be16s(f, &s->gpio.dir);
471 qemu_get_be16s(f, &s->gpio.level);
473 s->kbd.dbnctime = qemu_get_byte(f);
474 s->kbd.size = qemu_get_byte(f);
475 s->kbd.start = qemu_get_byte(f);
476 s->kbd.len = qemu_get_byte(f);
477 qemu_get_buffer(f, s->kbd.fifo, sizeof(s->kbd.fifo));
479 for (i = 0; i < sizeof(s->pwm.file); i ++)
480 qemu_get_be16s(f, &s->pwm.file[i]);
481 qemu_get_8s(f, &s->pwm.faddr);
482 qemu_get_buffer(f, s->pwm.addr, sizeof(s->pwm.addr));
483 qemu_get_timer(f, s->pwm.tm[0]);
484 qemu_get_timer(f, s->pwm.tm[1]);
485 qemu_get_timer(f, s->pwm.tm[2]);
487 lm_kbd_irq_update(s);
488 lm_kbd_gpio_update(s);
493 struct i2c_slave *lm8323_init(i2c_bus *bus, qemu_irq nirq)
497 s = (struct lm_kbd_s *) i2c_slave_init(bus, 0, sizeof(struct lm_kbd_s));
499 s->pwm.tm[0] = qemu_new_timer(vm_clock, lm_kbd_pwm0_tick, s);
500 s->pwm.tm[1] = qemu_new_timer(vm_clock, lm_kbd_pwm1_tick, s);
501 s->pwm.tm[2] = qemu_new_timer(vm_clock, lm_kbd_pwm2_tick, s);
504 s->i2c.event = lm_i2c_event;
505 s->i2c.recv = lm_i2c_rx;
506 s->i2c.send = lm_i2c_tx;
510 qemu_register_reset((void *) lm_kbd_reset, s);
511 register_savevm("LM8323", -1, 0, lm_kbd_save, lm_kbd_load, s);
516 void lm832x_key_event(struct i2c_slave *i2c, int key, int state)
518 struct lm_kbd_s *s = (struct lm_kbd_s *) i2c;
520 if ((s->status & INT_ERROR) && (s->error & ERR_FIFOOVR))
523 if (s->kbd.len >= sizeof(s->kbd.fifo))
524 return lm_kbd_error(s, ERR_FIFOOVR);
526 s->kbd.fifo[(s->kbd.start + s->kbd.len ++) & (sizeof(s->kbd.fifo) - 1)] =
529 /* We never set ERR_KEYOVR because we support multiple keys fine. */
530 s->status |= INT_KEYPAD;
531 lm_kbd_irq_update(s);