spitz_pm.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Battery and Power Management code for the Sharp SL-Cxx00
  4 *
  5 * Copyright (c) 2005 Richard Purdie
  6 */
  7
  8#include <linux/module.h>
  9#include <linux/stat.h>
 10#include <linux/init.h>
 11#include <linux/kernel.h>
 12#include <linux/delay.h>
 13#include <linux/gpio.h>
 14#include <linux/gpio-pxa.h>
 15#include <linux/interrupt.h>
 16#include <linux/platform_device.h>
 17#include <linux/apm-emulation.h>
 18#include <linux/spi/corgi_lcd.h>
 19
 20#include <asm/irq.h>
 21#include <asm/mach-types.h>
 22
 23#include "spitz.h"
 24#include "pxa27x.h"
 25#include "sharpsl_pm.h"
 26
 27#include "generic.h"
 28
 29#define SHARPSL_CHARGE_ON_VOLT         0x99  /* 2.9V */
 30#define SHARPSL_CHARGE_ON_TEMP         0xe0  /* 2.9V */
 31#define SHARPSL_CHARGE_ON_ACIN_HIGH    0x9b  /* 6V */
 32#define SHARPSL_CHARGE_ON_ACIN_LOW     0x34  /* 2V */
 33#define SHARPSL_FATAL_ACIN_VOLT        182   /* 3.45V */
 34#define SHARPSL_FATAL_NOACIN_VOLT      170   /* 3.40V */
 35
 36static int spitz_last_ac_status;
 37
 38static void spitz_charger_init(void)
 39{
 40	gpio_request(SPITZ_GPIO_KEY_INT, "Keyboard Interrupt");
 41	gpio_direction_input(SPITZ_GPIO_KEY_INT);
 42	gpio_request(SPITZ_GPIO_SYNC, "Sync");
 43	gpio_direction_input(SPITZ_GPIO_SYNC);
 44	gpio_request(SPITZ_GPIO_AC_IN, "Charger Detection");
 45	gpio_direction_input(SPITZ_GPIO_AC_IN);
 46	gpio_request(SPITZ_GPIO_ADC_TEMP_ON, "ADC Temp On");
 47	gpio_direction_output(SPITZ_GPIO_ADC_TEMP_ON, 0);
 48	gpio_request(SPITZ_GPIO_JK_B, "JK B");
 49	gpio_direction_output(SPITZ_GPIO_JK_B, 0);
 50	gpio_request(SPITZ_GPIO_CHRG_ON, "Charger On");
 51	gpio_direction_output(SPITZ_GPIO_CHRG_ON, 0);
 52}
 53
 54static void spitz_measure_temp(int on)
 55{
 56	gpio_set_value(SPITZ_GPIO_ADC_TEMP_ON, on);
 57}
 58
 59static void spitz_charge(int on)
 60{
 61	if (on) {
 62		if (sharpsl_pm.flags & SHARPSL_SUSPENDED) {
 63			gpio_set_value(SPITZ_GPIO_JK_B, 1);
 64			gpio_set_value(SPITZ_GPIO_CHRG_ON, 0);
 65		} else {
 66			gpio_set_value(SPITZ_GPIO_JK_B, 0);
 67			gpio_set_value(SPITZ_GPIO_CHRG_ON, 0);
 68		}
 69	} else {
 70		gpio_set_value(SPITZ_GPIO_JK_B, 0);
 71		gpio_set_value(SPITZ_GPIO_CHRG_ON, 1);
 72	}
 73}
 74
 75static void spitz_discharge(int on)
 76{
 77	gpio_set_value(SPITZ_GPIO_JK_A, on);
 78}
 79
 80/* HACK - For unknown reasons, accurate voltage readings are only made with a load
 81   on the power bus which the green led on spitz provides */
 82static void spitz_discharge1(int on)
 83{
 84	gpio_set_value(SPITZ_GPIO_LED_GREEN, on);
 85}
 86
 87static unsigned long gpio18_config = GPIO18_GPIO;
 88
 89static void spitz_presuspend(void)
 90{
 91	spitz_last_ac_status = sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN);
 92
 93	/* GPIO Sleep Register */
 94	PGSR0 = 0x00144018;
 95	PGSR1 = 0x00EF0000;
 96	if (machine_is_akita()) {
 97		PGSR2 = 0x2121C000;
 98		PGSR3 = 0x00600400;
 99	} else {
100		PGSR2 = 0x0121C000;
101		PGSR3 = 0x00600000;
102	}
103
104	PGSR0 &= ~SPITZ_GPIO_G0_STROBE_BIT;
105	PGSR1 &= ~SPITZ_GPIO_G1_STROBE_BIT;
106	PGSR2 &= ~SPITZ_GPIO_G2_STROBE_BIT;
107	PGSR3 &= ~SPITZ_GPIO_G3_STROBE_BIT;
108	PGSR2 |= GPIO_bit(SPITZ_GPIO_KEY_STROBE0);
109
110	pxa2xx_mfp_config(&gpio18_config, 1);
111	gpio_request_one(18, GPIOF_OUT_INIT_HIGH, "Unknown");
112	gpio_free(18);
113
114	PRER = GPIO_bit(SPITZ_GPIO_KEY_INT);
115	PFER = GPIO_bit(SPITZ_GPIO_KEY_INT) | GPIO_bit(SPITZ_GPIO_RESET);
116	PWER = GPIO_bit(SPITZ_GPIO_KEY_INT) | GPIO_bit(SPITZ_GPIO_RESET) | PWER_RTC;
117	PKWR = GPIO_bit(SPITZ_GPIO_SYNC) | GPIO_bit(SPITZ_GPIO_KEY_INT) | GPIO_bit(SPITZ_GPIO_RESET);
118	PKSR = 0xffffffff; /* clear */
119
120	/* nRESET_OUT Disable */
121	PSLR |= PSLR_SL_ROD;
122
123	/* Stop 3.6MHz and drive HIGH to PCMCIA and CS */
124	PCFR = PCFR_GPR_EN | PCFR_OPDE;
125}
126
127static void spitz_postsuspend(void)
128{
129}
130
131static int spitz_should_wakeup(unsigned int resume_on_alarm)
132{
133	int is_resume = 0;
134	int acin = sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN);
135
136	if (spitz_last_ac_status != acin) {
137		if (acin) {
138			/* charge on */
139			sharpsl_pm.flags |= SHARPSL_DO_OFFLINE_CHRG;
140			dev_dbg(sharpsl_pm.dev, "AC Inserted\n");
141		} else {
142			/* charge off */
143			dev_dbg(sharpsl_pm.dev, "AC Removed\n");
144			sharpsl_pm_led(SHARPSL_LED_OFF);
145			sharpsl_pm.machinfo->charge(0);
146			sharpsl_pm.charge_mode = CHRG_OFF;
147		}
148		spitz_last_ac_status = acin;
149		/* Return to suspend as this must be what we were woken for */
150		return 0;
151	}
152
153	if (PEDR & GPIO_bit(SPITZ_GPIO_KEY_INT))
154		is_resume |= GPIO_bit(SPITZ_GPIO_KEY_INT);
155
156	if (PKSR & GPIO_bit(SPITZ_GPIO_SYNC))
157		is_resume |= GPIO_bit(SPITZ_GPIO_SYNC);
158
159	if (resume_on_alarm && (PEDR & PWER_RTC))
160		is_resume |= PWER_RTC;
161
162	dev_dbg(sharpsl_pm.dev, "is_resume: %x\n", is_resume);
163	return is_resume;
164}
165
166static bool spitz_charger_wakeup(void)
167{
168	return !gpio_get_value(SPITZ_GPIO_KEY_INT) ||
169		gpio_get_value(SPITZ_GPIO_SYNC);
170}
171
172static unsigned long spitzpm_read_devdata(int type)
173{
174	switch (type) {
175	case SHARPSL_STATUS_ACIN:
176		return !gpio_get_value(SPITZ_GPIO_AC_IN);
177	case SHARPSL_STATUS_LOCK:
178		return gpio_get_value(sharpsl_pm.machinfo->gpio_batlock);
179	case SHARPSL_STATUS_CHRGFULL:
180		return gpio_get_value(sharpsl_pm.machinfo->gpio_batfull);
181	case SHARPSL_STATUS_FATAL:
182		return gpio_get_value(sharpsl_pm.machinfo->gpio_fatal);
183	case SHARPSL_ACIN_VOLT:
184		return sharpsl_pm_pxa_read_max1111(MAX1111_ACIN_VOLT);
185	case SHARPSL_BATT_TEMP:
186		return sharpsl_pm_pxa_read_max1111(MAX1111_BATT_TEMP);
187	case SHARPSL_BATT_VOLT:
188	default:
189		return sharpsl_pm_pxa_read_max1111(MAX1111_BATT_VOLT);
190	}
191}
192
193struct sharpsl_charger_machinfo spitz_pm_machinfo = {
194	.init             = spitz_charger_init,
195	.exit             = NULL,
196	.gpio_batlock     = SPITZ_GPIO_BAT_COVER,
197	.gpio_acin        = SPITZ_GPIO_AC_IN,
198	.gpio_batfull     = SPITZ_GPIO_CHRG_FULL,
199	.batfull_irq	  = 1,
200	.gpio_fatal       = SPITZ_GPIO_FATAL_BAT,
201	.discharge        = spitz_discharge,
202	.discharge1       = spitz_discharge1,
203	.charge           = spitz_charge,
204	.measure_temp     = spitz_measure_temp,
205	.presuspend       = spitz_presuspend,
206	.postsuspend      = spitz_postsuspend,
207	.read_devdata     = spitzpm_read_devdata,
208	.charger_wakeup   = spitz_charger_wakeup,
209	.should_wakeup    = spitz_should_wakeup,
210#if defined(CONFIG_LCD_CORGI)
211	.backlight_limit = corgi_lcd_limit_intensity,
212#endif
213	.charge_on_volt	  = SHARPSL_CHARGE_ON_VOLT,
214	.charge_on_temp	  = SHARPSL_CHARGE_ON_TEMP,
215	.charge_acin_high = SHARPSL_CHARGE_ON_ACIN_HIGH,
216	.charge_acin_low  = SHARPSL_CHARGE_ON_ACIN_LOW,
217	.fatal_acin_volt  = SHARPSL_FATAL_ACIN_VOLT,
218	.fatal_noacin_volt= SHARPSL_FATAL_NOACIN_VOLT,
219	.bat_levels       = 40,
220	.bat_levels_noac  = sharpsl_battery_levels_noac,
221	.bat_levels_acin  = sharpsl_battery_levels_acin,
222	.status_high_acin = 188,
223	.status_low_acin  = 178,
224	.status_high_noac = 185,
225	.status_low_noac  = 175,
226};
227
228static struct platform_device *spitzpm_device;
229
230static int spitzpm_init(void)
231{
232	int ret;
233
234	if (!machine_is_spitz() && !machine_is_akita()
235			&& !machine_is_borzoi())
236		return -ENODEV;
237
238	spitzpm_device = platform_device_alloc("sharpsl-pm", -1);
239	if (!spitzpm_device)
240		return -ENOMEM;
241
242	spitzpm_device->dev.platform_data = &spitz_pm_machinfo;
243	ret = platform_device_add(spitzpm_device);
244
245	if (ret)
246		platform_device_put(spitzpm_device);
247
248	return ret;
249}
250
251static void spitzpm_exit(void)
252{
253	platform_device_unregister(spitzpm_device);
254}
255
256module_init(spitzpm_init);
257module_exit(spitzpm_exit);