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/* $OpenBSD: zaurus_apm.c,v 1.3 2005/03/13 05:13:15 uwe Exp $ */
/*
* Copyright (c) 2005 Uwe Stuehler <uwe@bsdx.de>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <arm/xscale/pxa2x0reg.h>
#include <arm/xscale/pxa2x0_apm.h>
#include <arm/xscale/pxa2x0_gpio.h>
#include <zaurus/dev/zaurus_scoopvar.h>
#include <zaurus/dev/zaurus_sspvar.h>
int apm_match(struct device *, void *, void *);
void apm_attach(struct device *, struct device *, void *);
struct cfattach apm_pxaip_ca = {
sizeof (struct pxa2x0_apm_softc), apm_match, apm_attach
};
/* MAX1111 command word */
#define MAXCTRL_PD0 (1<<0)
#define MAXCTRL_PD1 (1<<1)
#define MAXCTRL_SGL (1<<2)
#define MAXCTRL_UNI (1<<3)
#define MAXCTRL_SEL_SHIFT 4
#define MAXCTRL_STR (1<<7)
/* MAX1111 ADC channels */
#define BATT_THM 2
#define BATT_AD 4
#define JK_VAD 6
/* battery-related GPIO pins */
#define GPIO_AC_IN_C3000 115 /* active low */
#define GPIO_CHRG_FULL_C3000 101
#define GPIO_BATT_COVER_C3000 90 /* active low */
/* battery state */
#define BATT_RESET 0
#define BATT_ABSENT 1
#define BATT_NOT_CHARGING 2
#define BATT_CHARGING 3
#define BATT_FULL 4
#ifdef APMDEBUG
const char *zaurus_batt_state_names[5] = {
"reset", "absent", "not charging", "charging", "full"
};
#endif
int zaurus_batt_state = BATT_RESET;
struct battery_threshold {
int bt_volt;
int bt_life;
int bt_state;
};
struct battery_info {
int bi_minutes; /* minutes left at 100% battery life */
const struct battery_threshold *bi_thres;
};
const struct battery_threshold zaurus_battery_life_c3000[] = {
#if 0
{224, 125, APM_BATT_HIGH}, /* XXX untested */
#endif
{194, 100, APM_BATT_HIGH},
{188, 75, APM_BATT_HIGH},
{184, 50, APM_BATT_HIGH},
{180, 25, APM_BATT_LOW},
{176, 5, APM_BATT_LOW},
{0, 0, APM_BATT_CRITICAL},
};
const struct battery_info zaurus_battery_c3000 = {
360 /* minutes */,
zaurus_battery_life_c3000
};
const struct battery_info *zaurus_main_battery = &zaurus_battery_c3000;
#if 0
void zaurus_shutdownhook(void *);
#endif
int max1111_adc_value(int);
int max1111_adc_value_avg(int, int);
#if 0
int zaurus_jkvad_voltage(void);
int zaurus_battery_temp(void);
#endif
int zaurus_battery_voltage(void);
int zaurus_battery_state(int);
int zaurus_battery_life(int);
int zaurus_minutes_left(int);
int zaurus_ac_present(void);
int zaurus_charge_complete(void);
void zaurus_charge_control(int);
void zaurus_power_check(struct pxa2x0_apm_softc *);
void zaurus_power_info(struct pxa2x0_apm_softc *,
struct apm_power_info *);
int
apm_match(struct device *parent, void *match, void *aux)
{
return 1;
}
void
apm_attach(struct device *parent, struct device *self, void *aux)
{
struct pxa2x0_apm_softc *sc = (struct pxa2x0_apm_softc *)self;
pxa2x0_gpio_set_function(GPIO_AC_IN_C3000, GPIO_IN);
pxa2x0_gpio_set_function(GPIO_CHRG_FULL_C3000, GPIO_IN);
pxa2x0_gpio_set_function(GPIO_BATT_COVER_C3000, GPIO_IN);
#if 0
(void)pxa2x0_gpio_intr_establish(GPIO_AC_IN_C3000, IST_EDGE_BOTH,
IPL_BIO, apm_intr, sc, "apm_ac");
#endif
sc->sc_periodic_check = zaurus_power_check;
sc->sc_power_info = zaurus_power_info;
/* Initialize the battery status before APM is enabled. */
zaurus_power_check(sc);
pxa2x0_apm_attach_sub(sc);
#if 0
(void)shutdownhook_establish(zaurus_shutdownhook, NULL);
#endif
}
#if 0
void
zaurus_shutdownhook(void *v)
{
/* XXX */
zaurus_charge_control(BATT_NOT_CHARGING);
}
#endif
int
max1111_adc_value(int chan)
{
return zssp_read_max1111(MAXCTRL_PD0 | MAXCTRL_PD1 |
MAXCTRL_SGL | MAXCTRL_UNI | (chan << MAXCTRL_SEL_SHIFT) |
MAXCTRL_STR);
}
/* XXX simplify */
int
max1111_adc_value_avg(int chan, int pause)
{
int val[5];
int i, j, k, x;
int sum = 0;
for (i = 0; i < 5; i++) {
val[i] = max1111_adc_value(chan);
if (i != 4)
delay(pause * 1000);
}
x = val[0];
j = 0;
for (i = 1; i < 5; i++) {
if (x < val[i]) {
x = val[i];
j = i;
}
}
x = val[4];
k = 4;
for (i = 3; i >= 0; i--) {
if (x > val[i]) {
x = val[i];
k = i;
}
}
for (i = 0; i < 5; i++) {
if (i == j || i == k)
continue;
sum += val[i];
}
return (sum / 3);
}
#if 0
/*
* Return the voltage available for charging. This will be zero,
* unless A/C power is connected.
*/
int
zaurus_jkvad_voltage(void)
{
return max1111_adc_value_avg(JK_VAD, 10);
}
int
zaurus_battery_temp(void)
{
int temp;
scoop_battery_temp_adc(1);
delay(10000);
temp = max1111_adc_value_avg(BATT_THM, 1);
scoop_battery_temp_adc(0);
return temp;
}
#endif
int
zaurus_battery_voltage(void)
{
return max1111_adc_value_avg(BATT_AD, 10);
}
int
zaurus_battery_state(int volt)
{
const struct battery_threshold *bthr;
int i;
bthr = zaurus_main_battery->bi_thres;
for (i = 0; bthr[i].bt_volt > 0; i++)
if (bthr[i].bt_volt <= volt)
break;
return (bthr[i].bt_state);
}
int
zaurus_battery_life(int volt)
{
const struct battery_threshold *bthr;
int i;
bthr = zaurus_main_battery->bi_thres;
for (i = 0; bthr[i].bt_volt > 0; i++)
if (bthr[i].bt_volt <= volt)
break;
if (i == 0)
return (bthr[i].bt_life);
return (bthr[i].bt_life +
((bthr[i-1].bt_volt - volt) * 100) /
(bthr[i-1].bt_volt - bthr[i].bt_volt) *
(bthr[i-1].bt_life - bthr[i].bt_life) / 100);
}
int
zaurus_minutes_left(int life)
{
return (zaurus_main_battery->bi_minutes * life / 100);
}
int
zaurus_ac_present(void)
{
return !pxa2x0_gpio_get_bit(GPIO_AC_IN_C3000);
}
/*
* Return non-zero if the charge complete signal is set. This signal
* is valid only after charging is restarted.
*/
int
zaurus_charge_complete(void)
{
return pxa2x0_gpio_get_bit(GPIO_CHRG_FULL_C3000);
}
void
zaurus_charge_control(int state)
{
switch (state) {
case BATT_RESET:
case BATT_ABSENT:
case BATT_NOT_CHARGING:
case BATT_FULL:
scoop_charge_battery(0, 0);
scoop_led_set(SCOOP_LED_ORANGE, 0);
/* Always force a 15 ms delay before charging again. */
delay(15000);
break;
case BATT_CHARGING:
scoop_charge_battery(1, 0);
scoop_led_set(SCOOP_LED_ORANGE, 1);
break;
default:
printf("zaurus_charge_control: bad state %d\n", state);
break;
}
}
/*
* Check A/C power and control battery charging. This gets called once
* from apm_attach(), and once per second from the APM kernel thread.
*/
void
zaurus_power_check(struct pxa2x0_apm_softc *sc)
{
int state = zaurus_batt_state;
switch (state) {
case BATT_RESET:
zaurus_charge_control(state);
/* FALLTHROUGH */
case BATT_ABSENT:
state = BATT_NOT_CHARGING;
/* FALLTHROUGH */
case BATT_NOT_CHARGING:
if (zaurus_ac_present())
state = BATT_CHARGING;
break;
case BATT_CHARGING:
if (!zaurus_ac_present())
state = BATT_NOT_CHARGING;
else if (zaurus_charge_complete())
state = BATT_FULL;
break;
case BATT_FULL:
if (!zaurus_ac_present())
state = BATT_NOT_CHARGING;
break;
default:
printf("zaurus_power_check: bad state %d\n", state);
break;
}
if (zaurus_batt_state != state) {
#ifdef APMDEBUG
printf("%s: battery state %s -> %s volt %d\n",
sc->sc_dev.dv_xname,
zaurus_batt_state_names[zaurus_batt_state],
zaurus_batt_state_names[state],
zaurus_battery_voltage());
#endif
zaurus_charge_control(state);
zaurus_batt_state = state;
}
}
/*
* Report A/C and battery state in response to a request from apmd.
*/
void
zaurus_power_info(struct pxa2x0_apm_softc *sc,
struct apm_power_info *power)
{
int volt;
if (zaurus_batt_state == BATT_CHARGING) {
power->ac_state = APM_AC_ON;
power->battery_state = APM_BATT_CHARGING;
power->battery_life = 100;
power->minutes_left = zaurus_main_battery->bi_minutes;
} else {
power->ac_state = zaurus_ac_present() ? APM_AC_ON :
APM_AC_OFF;
volt = zaurus_battery_voltage();
power->battery_state = zaurus_battery_state(volt);
power->battery_life = zaurus_battery_life(volt);
power->minutes_left =
zaurus_minutes_left(power->battery_life);
}
}
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