Version:  2.0.40 2.2.26 2.4.37 3.3 3.4 3.5 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

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 = psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &val);
 53 
 54                 if (!ret && val.intval) {
 55                         charger_present = true;
 56                         break;
 57                 }
 58         }
 59 
 60         if (!charger_present)
 61                 goto shutdown;
 62 
 63         /* Check if battery is known */
 64         psy = power_supply_get_by_name("ab8500_btemp");
 65         if (psy) {
 66                 ret = psy->get_property(psy, POWER_SUPPLY_PROP_TECHNOLOGY,
 67                                         &val);
 68                 if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {
 69                         printk(KERN_INFO
 70                                "Charger \"%s\" is connected with known battery."
 71                                " Rebooting.\n",
 72                                pss[i]);
 73                         machine_restart("charging");
 74                 }
 75         }
 76 
 77 shutdown:
 78         sigfillset(&all);
 79 
 80         if (!sigprocmask(SIG_BLOCK, &all, &old)) {
 81                 (void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
 82                                          AB8500_STW4500CTRL1_SWOFF |
 83                                          AB8500_STW4500CTRL1_SWRESET4500N);
 84                 (void)sigprocmask(SIG_SETMASK, &old, NULL);
 85         }
 86 }
 87 
 88 static inline bool valid_bank(u8 bank)
 89 {
 90         return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
 91                 (bank == AB8500_SYS_CTRL2_BLOCK));
 92 }
 93 
 94 int ab8500_sysctrl_read(u16 reg, u8 *value)
 95 {
 96         u8 bank;
 97 
 98         if (sysctrl_dev == NULL)
 99                 return -EINVAL;
100 
101         bank = (reg >> 8);
102         if (!valid_bank(bank))
103                 return -EINVAL;
104 
105         return abx500_get_register_interruptible(sysctrl_dev, bank,
106                 (u8)(reg & 0xFF), value);
107 }
108 EXPORT_SYMBOL(ab8500_sysctrl_read);
109 
110 int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
111 {
112         u8 bank;
113 
114         if (sysctrl_dev == NULL)
115                 return -EINVAL;
116 
117         bank = (reg >> 8);
118         if (!valid_bank(bank))
119                 return -EINVAL;
120 
121         return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
122                 (u8)(reg & 0xFF), mask, value);
123 }
124 EXPORT_SYMBOL(ab8500_sysctrl_write);
125 
126 static int ab8500_sysctrl_probe(struct platform_device *pdev)
127 {
128         struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
129         struct ab8500_platform_data *plat;
130         struct ab8500_sysctrl_platform_data *pdata;
131 
132         plat = dev_get_platdata(pdev->dev.parent);
133 
134         if (!plat)
135                 return -EINVAL;
136 
137         sysctrl_dev = &pdev->dev;
138 
139         if (!pm_power_off)
140                 pm_power_off = ab8500_power_off;
141 
142         pdata = plat->sysctrl;
143         if (pdata) {
144                 int last, ret, i, j;
145 
146                 if (is_ab8505(ab8500))
147                         last = AB8500_SYSCLKREQ4RFCLKBUF;
148                 else
149                         last = AB8500_SYSCLKREQ8RFCLKBUF;
150 
151                 for (i = AB8500_SYSCLKREQ1RFCLKBUF; i <= last; i++) {
152                         j = i - AB8500_SYSCLKREQ1RFCLKBUF;
153                         ret = ab8500_sysctrl_write(i, 0xff,
154                                         pdata->initial_req_buf_config[j]);
155                         dev_dbg(&pdev->dev,
156                                         "Setting SysClkReq%dRfClkBuf 0x%X\n",
157                                         j + 1,
158                                         pdata->initial_req_buf_config[j]);
159                         if (ret < 0) {
160                                 dev_err(&pdev->dev,
161                                         "unable to set sysClkReq%dRfClkBuf: "
162                                         "%d\n", j + 1, ret);
163                         }
164                 }
165         }
166 
167         return 0;
168 }
169 
170 static int ab8500_sysctrl_remove(struct platform_device *pdev)
171 {
172         sysctrl_dev = NULL;
173 
174         if (pm_power_off == ab8500_power_off)
175                 pm_power_off = NULL;
176 
177         return 0;
178 }
179 
180 static struct platform_driver ab8500_sysctrl_driver = {
181         .driver = {
182                 .name = "ab8500-sysctrl",
183         },
184         .probe = ab8500_sysctrl_probe,
185         .remove = ab8500_sysctrl_remove,
186 };
187 
188 static int __init ab8500_sysctrl_init(void)
189 {
190         return platform_driver_register(&ab8500_sysctrl_driver);
191 }
192 arch_initcall(ab8500_sysctrl_init);
193 
194 MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
195 MODULE_DESCRIPTION("AB8500 system control driver");
196 MODULE_LICENSE("GPL v2");
197 

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