1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson.
4 * License terms: GNU General Public License (GPL) version 2
5 */
6
7#include <linux/err.h>
8#include <linux/module.h>
9#include <linux/platform_device.h>
10#include <linux/pm.h>
11#include <linux/reboot.h>
12#include <linux/signal.h>
13#include <linux/power_supply.h>
14#include <linux/mfd/abx500.h>
15#include <linux/mfd/abx500/ab8500.h>
16#include <linux/mfd/abx500/ab8500-sysctrl.h>
17
18/* RtcCtrl bits */
19#define AB8500_ALARM_MIN_LOW  0x08
20#define AB8500_ALARM_MIN_MID 0x09
21#define RTC_CTRL 0x0B
22#define RTC_ALARM_ENABLE 0x4
23
24static struct device *sysctrl_dev;
25
26static void ab8500_power_off(void)
27{
28	sigset_t old;
29	sigset_t all;
30	static char *pss[] = {"ab8500_ac", "pm2301", "ab8500_usb"};
31	int i;
32	bool charger_present = false;
33	union power_supply_propval val;
34	struct power_supply *psy;
35	int ret;
36
37	if (sysctrl_dev == NULL) {
38		pr_err("%s: sysctrl not initialized\n", __func__);
39		return;
40	}
41
42	/*
43	 * If we have a charger connected and we're powering off,
44	 * reboot into charge-only mode.
45	 */
46
47	for (i = 0; i < ARRAY_SIZE(pss); i++) {
48		psy = power_supply_get_by_name(pss[i]);
49		if (!psy)
50			continue;
51
52		ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,
53				&val);
54		power_supply_put(psy);
55
56		if (!ret && val.intval) {
57			charger_present = true;
58			break;
59		}
60	}
61
62	if (!charger_present)
63		goto shutdown;
64
65	/* Check if battery is known */
66	psy = power_supply_get_by_name("ab8500_btemp");
67	if (psy) {
68		ret = power_supply_get_property(psy,
69				POWER_SUPPLY_PROP_TECHNOLOGY, &val);
70		if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {
71			printk(KERN_INFO
72			       "Charger \"%s\" is connected with known battery."
73			       " Rebooting.\n",
74			       pss[i]);
75			machine_restart("charging");
76		}
77		power_supply_put(psy);
78	}
79
80shutdown:
81	sigfillset(&all);
82
83	if (!sigprocmask(SIG_BLOCK, &all, &old)) {
84		(void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
85					 AB8500_STW4500CTRL1_SWOFF |
86					 AB8500_STW4500CTRL1_SWRESET4500N);
87		(void)sigprocmask(SIG_SETMASK, &old, NULL);
88	}
89}
90
91static inline bool valid_bank(u8 bank)
92{
93	return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
94		(bank == AB8500_SYS_CTRL2_BLOCK));
95}
96
97int ab8500_sysctrl_read(u16 reg, u8 *value)
98{
99	u8 bank;
100
101	if (sysctrl_dev == NULL)
102		return -EINVAL;
103
104	bank = (reg >> 8);
105	if (!valid_bank(bank))
106		return -EINVAL;
107
108	return abx500_get_register_interruptible(sysctrl_dev, bank,
109		(u8)(reg & 0xFF), value);
110}
111EXPORT_SYMBOL(ab8500_sysctrl_read);
112
113int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
114{
115	u8 bank;
116
117	if (sysctrl_dev == NULL)
118		return -EINVAL;
119
120	bank = (reg >> 8);
121	if (!valid_bank(bank))
122		return -EINVAL;
123
124	return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
125		(u8)(reg & 0xFF), mask, value);
126}
127EXPORT_SYMBOL(ab8500_sysctrl_write);
128
129static int ab8500_sysctrl_probe(struct platform_device *pdev)
130{
131	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
132	struct ab8500_platform_data *plat;
133	struct ab8500_sysctrl_platform_data *pdata;
134
135	plat = dev_get_platdata(pdev->dev.parent);
136
137	if (!plat)
138		return -EINVAL;
139
140	sysctrl_dev = &pdev->dev;
141
142	if (!pm_power_off)
143		pm_power_off = ab8500_power_off;
144
145	pdata = plat->sysctrl;
146	if (pdata) {
147		int last, ret, i, j;
148
149		if (is_ab8505(ab8500))
150			last = AB8500_SYSCLKREQ4RFCLKBUF;
151		else
152			last = AB8500_SYSCLKREQ8RFCLKBUF;
153
154		for (i = AB8500_SYSCLKREQ1RFCLKBUF; i <= last; i++) {
155			j = i - AB8500_SYSCLKREQ1RFCLKBUF;
156			ret = ab8500_sysctrl_write(i, 0xff,
157					pdata->initial_req_buf_config[j]);
158			dev_dbg(&pdev->dev,
159					"Setting SysClkReq%dRfClkBuf 0x%X\n",
160					j + 1,
161					pdata->initial_req_buf_config[j]);
162			if (ret < 0) {
163				dev_err(&pdev->dev,
164					"unable to set sysClkReq%dRfClkBuf: "
165					"%d\n", j + 1, ret);
166			}
167		}
168	}
169
170	return 0;
171}
172
173static int ab8500_sysctrl_remove(struct platform_device *pdev)
174{
175	sysctrl_dev = NULL;
176
177	if (pm_power_off == ab8500_power_off)
178		pm_power_off = NULL;
179
180	return 0;
181}
182
183static struct platform_driver ab8500_sysctrl_driver = {
184	.driver = {
185		.name = "ab8500-sysctrl",
186	},
187	.probe = ab8500_sysctrl_probe,
188	.remove = ab8500_sysctrl_remove,
189};
190
191static int __init ab8500_sysctrl_init(void)
192{
193	return platform_driver_register(&ab8500_sysctrl_driver);
194}
195arch_initcall(ab8500_sysctrl_init);
196
197MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
198MODULE_DESCRIPTION("AB8500 system control driver");
199MODULE_LICENSE("GPL v2");
200