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
8 #include <linux/module.h>
9 #include <linux/platform_device.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>
18 static struct device *sysctrl_dev;
20 void ab8500_power_off(void)
24 static char *pss[] = {"ab8500_ac", "ab8500_usb"};
26 bool charger_present = false;
27 union power_supply_propval val;
28 struct power_supply *psy;
32 * If we have a charger connected and we're powering off,
33 * reboot into charge-only mode.
36 for (i = 0; i < ARRAY_SIZE(pss); i++) {
37 psy = power_supply_get_by_name(pss[i]);
41 ret = psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val);
43 if (!ret && val.intval) {
44 charger_present = true;
52 /* Check if battery is known */
53 psy = power_supply_get_by_name("ab8500_btemp");
55 ret = psy->get_property(psy, POWER_SUPPLY_PROP_TECHNOLOGY,
57 if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {
59 "Charger \"%s\" is connected with known battery."
62 machine_restart("charging");
69 if (!sigprocmask(SIG_BLOCK, &all, &old)) {
70 (void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
71 AB8500_STW4500CTRL1_SWOFF |
72 AB8500_STW4500CTRL1_SWRESET4500N);
73 (void)sigprocmask(SIG_SETMASK, &old, NULL);
77 static inline bool valid_bank(u8 bank)
79 return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
80 (bank == AB8500_SYS_CTRL2_BLOCK));
83 int ab8500_sysctrl_read(u16 reg, u8 *value)
87 if (sysctrl_dev == NULL)
91 if (!valid_bank(bank))
94 return abx500_get_register_interruptible(sysctrl_dev, bank,
95 (u8)(reg & 0xFF), value);
97 EXPORT_SYMBOL(ab8500_sysctrl_read);
99 int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
103 if (sysctrl_dev == NULL)
107 if (!valid_bank(bank))
110 return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
111 (u8)(reg & 0xFF), mask, value);
113 EXPORT_SYMBOL(ab8500_sysctrl_write);
115 static int ab8500_sysctrl_probe(struct platform_device *pdev)
117 struct ab8500_platform_data *plat;
118 struct ab8500_sysctrl_platform_data *pdata;
120 sysctrl_dev = &pdev->dev;
121 plat = dev_get_platdata(pdev->dev.parent);
122 if (plat->pm_power_off)
123 pm_power_off = ab8500_power_off;
125 pdata = plat->sysctrl;
130 for (i = AB8500_SYSCLKREQ1RFCLKBUF;
131 i <= AB8500_SYSCLKREQ8RFCLKBUF; i++) {
132 j = i - AB8500_SYSCLKREQ1RFCLKBUF;
133 ret = ab8500_sysctrl_write(i, 0xff,
134 pdata->initial_req_buf_config[j]);
136 "Setting SysClkReq%dRfClkBuf 0x%X\n",
138 pdata->initial_req_buf_config[j]);
141 "unable to set sysClkReq%dRfClkBuf: "
150 static int ab8500_sysctrl_remove(struct platform_device *pdev)
156 static struct platform_driver ab8500_sysctrl_driver = {
158 .name = "ab8500-sysctrl",
159 .owner = THIS_MODULE,
161 .probe = ab8500_sysctrl_probe,
162 .remove = ab8500_sysctrl_remove,
165 static int __init ab8500_sysctrl_init(void)
167 return platform_driver_register(&ab8500_sysctrl_driver);
169 subsys_initcall(ab8500_sysctrl_init);
171 MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
172 MODULE_DESCRIPTION("AB8500 system control driver");
173 MODULE_LICENSE("GPL v2");