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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 const char * const 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                         pr_info("Charger '%s' is connected with known battery",
 72                                 pss[i]);
 73                         pr_info(" - Rebooting.\n");
 74                         machine_restart("charging");
 75                 }
 76                 power_supply_put(psy);
 77         }
 78 
 79 shutdown:
 80         sigfillset(&all);
 81 
 82         if (!sigprocmask(SIG_BLOCK, &all, &old)) {
 83                 (void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
 84                                          AB8500_STW4500CTRL1_SWOFF |
 85                                          AB8500_STW4500CTRL1_SWRESET4500N);
 86                 (void)sigprocmask(SIG_SETMASK, &old, NULL);
 87         }
 88 }
 89 
 90 static inline bool valid_bank(u8 bank)
 91 {
 92         return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
 93                 (bank == AB8500_SYS_CTRL2_BLOCK));
 94 }
 95 
 96 int ab8500_sysctrl_read(u16 reg, u8 *value)
 97 {
 98         u8 bank;
 99 
100         if (sysctrl_dev == NULL)
101                 return -EINVAL;
102 
103         bank = (reg >> 8);
104         if (!valid_bank(bank))
105                 return -EINVAL;
106 
107         return abx500_get_register_interruptible(sysctrl_dev, bank,
108                 (u8)(reg & 0xFF), value);
109 }
110 EXPORT_SYMBOL(ab8500_sysctrl_read);
111 
112 int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
113 {
114         u8 bank;
115 
116         if (sysctrl_dev == NULL)
117                 return -EINVAL;
118 
119         bank = (reg >> 8);
120         if (!valid_bank(bank))
121                 return -EINVAL;
122 
123         return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
124                 (u8)(reg & 0xFF), mask, value);
125 }
126 EXPORT_SYMBOL(ab8500_sysctrl_write);
127 
128 static int ab8500_sysctrl_probe(struct platform_device *pdev)
129 {
130         struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
131         struct ab8500_platform_data *plat;
132         struct ab8500_sysctrl_platform_data *pdata;
133 
134         plat = dev_get_platdata(pdev->dev.parent);
135 
136         if (!plat)
137                 return -EINVAL;
138 
139         sysctrl_dev = &pdev->dev;
140 
141         if (!pm_power_off)
142                 pm_power_off = ab8500_power_off;
143 
144         pdata = plat->sysctrl;
145         if (pdata) {
146                 int last, ret, i, j;
147 
148                 if (is_ab8505(ab8500))
149                         last = AB8500_SYSCLKREQ4RFCLKBUF;
150                 else
151                         last = AB8500_SYSCLKREQ8RFCLKBUF;
152 
153                 for (i = AB8500_SYSCLKREQ1RFCLKBUF; i <= last; i++) {
154                         j = i - AB8500_SYSCLKREQ1RFCLKBUF;
155                         ret = ab8500_sysctrl_write(i, 0xff,
156                                         pdata->initial_req_buf_config[j]);
157                         dev_dbg(&pdev->dev,
158                                         "Setting SysClkReq%dRfClkBuf 0x%X\n",
159                                         j + 1,
160                                         pdata->initial_req_buf_config[j]);
161                         if (ret < 0) {
162                                 dev_err(&pdev->dev,
163                                         "Can't set sysClkReq%dRfClkBuf: %d\n",
164                                         j + 1, ret);
165                         }
166                 }
167         }
168 
169         return 0;
170 }
171 
172 static int ab8500_sysctrl_remove(struct platform_device *pdev)
173 {
174         sysctrl_dev = NULL;
175 
176         if (pm_power_off == ab8500_power_off)
177                 pm_power_off = NULL;
178 
179         return 0;
180 }
181 
182 static struct platform_driver ab8500_sysctrl_driver = {
183         .driver = {
184                 .name = "ab8500-sysctrl",
185         },
186         .probe = ab8500_sysctrl_probe,
187         .remove = ab8500_sysctrl_remove,
188 };
189 
190 static int __init ab8500_sysctrl_init(void)
191 {
192         return platform_driver_register(&ab8500_sysctrl_driver);
193 }
194 arch_initcall(ab8500_sysctrl_init);
195 
196 MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
197 MODULE_DESCRIPTION("AB8500 system control driver");
198 MODULE_LICENSE("GPL v2");
199 

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