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path: root/drivers/power/palmtx_battery.c
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Diffstat (limited to 'drivers/power/palmtx_battery.c')
-rw-r--r--drivers/power/palmtx_battery.c198
1 files changed, 198 insertions, 0 deletions
diff --git a/drivers/power/palmtx_battery.c b/drivers/power/palmtx_battery.c
new file mode 100644
index 000000000000..244bb273a637
--- /dev/null
+++ b/drivers/power/palmtx_battery.c
@@ -0,0 +1,198 @@
1/*
2 * linux/drivers/power/palmtx_battery.c
3 *
4 * Battery measurement code for Palm T|X Handheld computer
5 *
6 * based on tosa_battery.c
7 *
8 * Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 */
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/power_supply.h>
18#include <linux/wm97xx.h>
19#include <linux/delay.h>
20#include <linux/spinlock.h>
21#include <linux/interrupt.h>
22#include <linux/gpio.h>
23
24#include <asm/mach-types.h>
25#include <asm/arch/palmtx.h>
26
27static DEFINE_MUTEX(bat_lock);
28static struct work_struct bat_work;
29struct mutex work_lock;
30int bat_status = POWER_SUPPLY_STATUS_DISCHARGING;
31
32static unsigned long palmtx_read_bat(struct power_supply *bat_ps)
33{
34 return wm97xx_read_aux_adc(bat_ps->dev->parent->driver_data,
35 WM97XX_AUX_ID3) * 1000 / 414;
36}
37
38static unsigned long palmtx_read_temp(struct power_supply *bat_ps)
39{
40 return wm97xx_read_aux_adc(bat_ps->dev->parent->driver_data,
41 WM97XX_AUX_ID2);
42}
43
44static int palmtx_bat_get_property(struct power_supply *bat_ps,
45 enum power_supply_property psp,
46 union power_supply_propval *val)
47{
48 switch (psp) {
49 case POWER_SUPPLY_PROP_STATUS:
50 val->intval = bat_status;
51 break;
52 case POWER_SUPPLY_PROP_TECHNOLOGY:
53 val->intval = POWER_SUPPLY_TECHNOLOGY_LIPO;
54 break;
55 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
56 val->intval = palmtx_read_bat(bat_ps);
57 break;
58 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
59 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
60 val->intval = PALMTX_BAT_MAX_VOLTAGE;
61 break;
62 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
63 val->intval = PALMTX_BAT_MIN_VOLTAGE;
64 break;
65 case POWER_SUPPLY_PROP_TEMP:
66 val->intval = palmtx_read_temp(bat_ps);
67 break;
68 case POWER_SUPPLY_PROP_PRESENT:
69 val->intval = 1;
70 break;
71 default:
72 return -EINVAL;
73 }
74 return 0;
75}
76
77static void palmtx_bat_external_power_changed(struct power_supply *bat_ps)
78{
79 schedule_work(&bat_work);
80}
81
82static char *status_text[] = {
83 [POWER_SUPPLY_STATUS_UNKNOWN] = "Unknown",
84 [POWER_SUPPLY_STATUS_CHARGING] = "Charging",
85 [POWER_SUPPLY_STATUS_DISCHARGING] = "Discharging",
86};
87
88static void palmtx_bat_update(struct power_supply *bat_ps)
89{
90 int old_status = bat_status;
91
92 mutex_lock(&work_lock);
93
94 bat_status = gpio_get_value(GPIO_NR_PALMTX_POWER_DETECT) ?
95 POWER_SUPPLY_STATUS_CHARGING :
96 POWER_SUPPLY_STATUS_DISCHARGING;
97
98 if (old_status != bat_status) {
99 pr_debug("%s %s -> %s\n", bat_ps->name,
100 status_text[old_status],
101 status_text[bat_status]);
102 power_supply_changed(bat_ps);
103 }
104
105 mutex_unlock(&work_lock);
106}
107
108static enum power_supply_property palmtx_bat_main_props[] = {
109 POWER_SUPPLY_PROP_STATUS,
110 POWER_SUPPLY_PROP_TECHNOLOGY,
111 POWER_SUPPLY_PROP_VOLTAGE_NOW,
112 POWER_SUPPLY_PROP_VOLTAGE_MAX,
113 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
114 POWER_SUPPLY_PROP_TEMP,
115 POWER_SUPPLY_PROP_PRESENT,
116};
117
118struct power_supply bat_ps = {
119 .name = "main-battery",
120 .type = POWER_SUPPLY_TYPE_BATTERY,
121 .properties = palmtx_bat_main_props,
122 .num_properties = ARRAY_SIZE(palmtx_bat_main_props),
123 .get_property = palmtx_bat_get_property,
124 .external_power_changed = palmtx_bat_external_power_changed,
125 .use_for_apm = 1,
126};
127
128static void palmtx_bat_work(struct work_struct *work)
129{
130 palmtx_bat_update(&bat_ps);
131}
132
133#ifdef CONFIG_PM
134static int palmtx_bat_suspend(struct platform_device *dev, pm_message_t state)
135{
136 flush_scheduled_work();
137 return 0;
138}
139
140static int palmtx_bat_resume(struct platform_device *dev)
141{
142 schedule_work(&bat_work);
143 return 0;
144}
145#else
146#define palmtx_bat_suspend NULL
147#define palmtx_bat_resume NULL
148#endif
149
150static int __devinit palmtx_bat_probe(struct platform_device *dev)
151{
152 int ret = 0;
153
154 if (!machine_is_palmtx())
155 return -ENODEV;
156
157 mutex_init(&work_lock);
158
159 INIT_WORK(&bat_work, palmtx_bat_work);
160
161 ret = power_supply_register(&dev->dev, &bat_ps);
162 if (!ret)
163 schedule_work(&bat_work);
164
165 return ret;
166}
167
168static int __devexit palmtx_bat_remove(struct platform_device *dev)
169{
170 power_supply_unregister(&bat_ps);
171 return 0;
172}
173
174static struct platform_driver palmtx_bat_driver = {
175 .driver.name = "wm97xx-battery",
176 .driver.owner = THIS_MODULE,
177 .probe = palmtx_bat_probe,
178 .remove = __devexit_p(palmtx_bat_remove),
179 .suspend = palmtx_bat_suspend,
180 .resume = palmtx_bat_resume,
181};
182
183static int __init palmtx_bat_init(void)
184{
185 return platform_driver_register(&palmtx_bat_driver);
186}
187
188static void __exit palmtx_bat_exit(void)
189{
190 platform_driver_unregister(&palmtx_bat_driver);
191}
192
193module_init(palmtx_bat_init);
194module_exit(palmtx_bat_exit);
195
196MODULE_LICENSE("GPL");
197MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
198MODULE_DESCRIPTION("Palm T|X battery driver");
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-06 10:32:53 -0400