1/*
2 * Battery and Power Management code for the Sharp SL-C7xx
3 *
4 * Copyright (c) 2005 Richard Purdie
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 */
11
12#include <linux/module.h>
13#include <linux/stat.h>
14#include <linux/init.h>
15#include <linux/kernel.h>
16#include <linux/delay.h>
17#include <linux/gpio.h>
18#include <linux/gpio-pxa.h>
19#include <linux/interrupt.h>
20#include <linux/platform_device.h>
21#include <linux/apm-emulation.h>
22#include <linux/io.h>
23
24#include <asm/irq.h>
25#include <asm/mach-types.h>
26#include <mach/hardware.h>
27
28#include <mach/corgi.h>
29#include <mach/pxa2xx-regs.h>
30#include <mach/sharpsl_pm.h>
31
32#include "generic.h"
33
34#define SHARPSL_CHARGE_ON_VOLT         0x99  /* 2.9V */
35#define SHARPSL_CHARGE_ON_TEMP         0xe0  /* 2.9V */
36#define SHARPSL_CHARGE_ON_ACIN_HIGH    0x9b  /* 6V */
37#define SHARPSL_CHARGE_ON_ACIN_LOW     0x34  /* 2V */
38#define SHARPSL_FATAL_ACIN_VOLT        182   /* 3.45V */
39#define SHARPSL_FATAL_NOACIN_VOLT      170   /* 3.40V */
40
41static struct gpio charger_gpios[] = {
42	{ CORGI_GPIO_ADC_TEMP_ON, GPIOF_OUT_INIT_LOW, "ADC Temp On" },
43	{ CORGI_GPIO_CHRG_ON,	  GPIOF_OUT_INIT_LOW, "Charger On" },
44	{ CORGI_GPIO_CHRG_UKN,	  GPIOF_OUT_INIT_LOW, "Charger Unknown" },
45	{ CORGI_GPIO_AC_IN,	  GPIOF_IN, "Charger Detection" },
46	{ CORGI_GPIO_KEY_INT,	  GPIOF_IN, "Key Interrupt" },
47	{ CORGI_GPIO_WAKEUP,	  GPIOF_IN, "System wakeup notification" },
48};
49
50static void corgi_charger_init(void)
51{
52	gpio_request_array(ARRAY_AND_SIZE(charger_gpios));
53}
54
55static void corgi_measure_temp(int on)
56{
57	gpio_set_value(CORGI_GPIO_ADC_TEMP_ON, on);
58}
59
60static void corgi_charge(int on)
61{
62	if (on) {
63		if (machine_is_corgi() && (sharpsl_pm.flags & SHARPSL_SUSPENDED)) {
64			gpio_set_value(CORGI_GPIO_CHRG_ON, 0);
65			gpio_set_value(CORGI_GPIO_CHRG_UKN, 1);
66		} else {
67			gpio_set_value(CORGI_GPIO_CHRG_ON, 1);
68			gpio_set_value(CORGI_GPIO_CHRG_UKN, 0);
69		}
70	} else {
71		gpio_set_value(CORGI_GPIO_CHRG_ON, 0);
72		gpio_set_value(CORGI_GPIO_CHRG_UKN, 0);
73	}
74}
75
76static void corgi_discharge(int on)
77{
78	gpio_set_value(CORGI_GPIO_DISCHARGE_ON, on);
79}
80
81static void corgi_presuspend(void)
82{
83}
84
85static void corgi_postsuspend(void)
86{
87}
88
89/*
90 * Check what brought us out of the suspend.
91 * Return: 0 to sleep, otherwise wake
92 */
93static int corgi_should_wakeup(unsigned int resume_on_alarm)
94{
95	int is_resume = 0;
96
97	dev_dbg(sharpsl_pm.dev, "PEDR = %x, GPIO_AC_IN = %d, "
98		"GPIO_CHRG_FULL = %d, GPIO_KEY_INT = %d, GPIO_WAKEUP = %d\n",
99		PEDR, gpio_get_value(CORGI_GPIO_AC_IN),
100		gpio_get_value(CORGI_GPIO_CHRG_FULL),
101		gpio_get_value(CORGI_GPIO_KEY_INT),
102		gpio_get_value(CORGI_GPIO_WAKEUP));
103
104	if ((PEDR & GPIO_bit(CORGI_GPIO_AC_IN))) {
105		if (sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN)) {
106			/* charge on */
107			dev_dbg(sharpsl_pm.dev, "ac insert\n");
108			sharpsl_pm.flags |= SHARPSL_DO_OFFLINE_CHRG;
109		} else {
110			/* charge off */
111			dev_dbg(sharpsl_pm.dev, "ac remove\n");
112			sharpsl_pm_led(SHARPSL_LED_OFF);
113			sharpsl_pm.machinfo->charge(0);
114			sharpsl_pm.charge_mode = CHRG_OFF;
115		}
116	}
117
118	if ((PEDR & GPIO_bit(CORGI_GPIO_CHRG_FULL)))
119		dev_dbg(sharpsl_pm.dev, "Charge full interrupt\n");
120
121	if (PEDR & GPIO_bit(CORGI_GPIO_KEY_INT))
122		is_resume |= GPIO_bit(CORGI_GPIO_KEY_INT);
123
124	if (PEDR & GPIO_bit(CORGI_GPIO_WAKEUP))
125		is_resume |= GPIO_bit(CORGI_GPIO_WAKEUP);
126
127	if (resume_on_alarm && (PEDR & PWER_RTC))
128		is_resume |= PWER_RTC;
129
130	dev_dbg(sharpsl_pm.dev, "is_resume: %x\n",is_resume);
131	return is_resume;
132}
133
134static unsigned long corgi_charger_wakeup(void)
135{
136	unsigned long ret;
137
138	ret = (!gpio_get_value(CORGI_GPIO_AC_IN) << GPIO_bit(CORGI_GPIO_AC_IN))
139		| (!gpio_get_value(CORGI_GPIO_KEY_INT)
140		<< GPIO_bit(CORGI_GPIO_KEY_INT))
141		| (!gpio_get_value(CORGI_GPIO_WAKEUP)
142		<< GPIO_bit(CORGI_GPIO_WAKEUP));
143	return ret;
144}
145
146unsigned long corgipm_read_devdata(int type)
147{
148	switch(type) {
149	case SHARPSL_STATUS_ACIN:
150		return !gpio_get_value(CORGI_GPIO_AC_IN);
151	case SHARPSL_STATUS_LOCK:
152		return gpio_get_value(sharpsl_pm.machinfo->gpio_batlock);
153	case SHARPSL_STATUS_CHRGFULL:
154		return gpio_get_value(sharpsl_pm.machinfo->gpio_batfull);
155	case SHARPSL_STATUS_FATAL:
156		return gpio_get_value(sharpsl_pm.machinfo->gpio_fatal);
157	case SHARPSL_ACIN_VOLT:
158		return sharpsl_pm_pxa_read_max1111(MAX1111_ACIN_VOLT);
159	case SHARPSL_BATT_TEMP:
160		return sharpsl_pm_pxa_read_max1111(MAX1111_BATT_TEMP);
161	case SHARPSL_BATT_VOLT:
162	default:
163		return sharpsl_pm_pxa_read_max1111(MAX1111_BATT_VOLT);
164	}
165}
166
167static struct sharpsl_charger_machinfo corgi_pm_machinfo = {
168	.init            = corgi_charger_init,
169	.exit            = NULL,
170	.gpio_batlock    = CORGI_GPIO_BAT_COVER,
171	.gpio_acin       = CORGI_GPIO_AC_IN,
172	.gpio_batfull    = CORGI_GPIO_CHRG_FULL,
173	.discharge       = corgi_discharge,
174	.charge          = corgi_charge,
175	.measure_temp    = corgi_measure_temp,
176	.presuspend      = corgi_presuspend,
177	.postsuspend     = corgi_postsuspend,
178	.read_devdata    = corgipm_read_devdata,
179	.charger_wakeup  = corgi_charger_wakeup,
180	.should_wakeup   = corgi_should_wakeup,
181#if defined(CONFIG_LCD_CORGI)
182	.backlight_limit = corgi_lcd_limit_intensity,
183#endif
184	.charge_on_volt	  = SHARPSL_CHARGE_ON_VOLT,
185	.charge_on_temp	  = SHARPSL_CHARGE_ON_TEMP,
186	.charge_acin_high = SHARPSL_CHARGE_ON_ACIN_HIGH,
187	.charge_acin_low  = SHARPSL_CHARGE_ON_ACIN_LOW,
188	.fatal_acin_volt  = SHARPSL_FATAL_ACIN_VOLT,
189	.fatal_noacin_volt= SHARPSL_FATAL_NOACIN_VOLT,
190	.bat_levels       = 40,
191	.bat_levels_noac  = sharpsl_battery_levels_noac,
192	.bat_levels_acin  = sharpsl_battery_levels_acin,
193	.status_high_acin = 188,
194	.status_low_acin  = 178,
195	.status_high_noac = 185,
196	.status_low_noac  = 175,
197};
198
199static struct platform_device *corgipm_device;
200
201static int corgipm_init(void)
202{
203	int ret;
204
205	if (!machine_is_corgi() && !machine_is_shepherd()
206			&& !machine_is_husky())
207		return -ENODEV;
208
209	corgipm_device = platform_device_alloc("sharpsl-pm", -1);
210	if (!corgipm_device)
211		return -ENOMEM;
212
213	if (!machine_is_corgi())
214	    corgi_pm_machinfo.batfull_irq = 1;
215
216	corgipm_device->dev.platform_data = &corgi_pm_machinfo;
217	ret = platform_device_add(corgipm_device);
218
219	if (ret)
220		platform_device_put(corgipm_device);
221
222	return ret;
223}
224
225static void corgipm_exit(void)
226{
227	platform_device_unregister(corgipm_device);
228}
229
230module_init(corgipm_init);
231module_exit(corgipm_exit);
232