Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

Linux/drivers/mfd/ab8500-sysctrl.c

  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 
 24 static struct device *sysctrl_dev;
 25 
 26 static 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 
 80 shutdown:
 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 
 91 static inline bool valid_bank(u8 bank)
 92 {
 93         return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
 94                 (bank == AB8500_SYS_CTRL2_BLOCK));
 95 }
 96 
 97 int 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 }
111 EXPORT_SYMBOL(ab8500_sysctrl_read);
112 
113 int 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 }
127 EXPORT_SYMBOL(ab8500_sysctrl_write);
128 
129 static 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 
173 static 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 
183 static 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 
191 static int __init ab8500_sysctrl_init(void)
192 {
193         return platform_driver_register(&ab8500_sysctrl_driver);
194 }
195 arch_initcall(ab8500_sysctrl_init);
196 
197 MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
198 MODULE_DESCRIPTION("AB8500 system control driver");
199 MODULE_LICENSE("GPL v2");
200 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us