Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / mfd / ab8500-sysctrl.c

diff --git a/kernel/drivers/mfd/ab8500-sysctrl.c b/kernel/drivers/mfd/ab8500-sysctrl.c
new file mode 100644 (file)
index 0000000..0d18256
--- /dev/null
+++ b/kernel/drivers/mfd/ab8500-sysctrl.c
@@ -0,0 +1,199 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson.
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/reboot.h>
+#include <linux/signal.h>
+#include <linux/power_supply.h>
+#include <linux/mfd/abx500.h>
+#include <linux/mfd/abx500/ab8500.h>
+#include <linux/mfd/abx500/ab8500-sysctrl.h>
+
+/* RtcCtrl bits */
+#define AB8500_ALARM_MIN_LOW  0x08
+#define AB8500_ALARM_MIN_MID 0x09
+#define RTC_CTRL 0x0B
+#define RTC_ALARM_ENABLE 0x4
+
+static struct device *sysctrl_dev;
+
+static void ab8500_power_off(void)
+{
+       sigset_t old;
+       sigset_t all;
+       static char *pss[] = {"ab8500_ac", "pm2301", "ab8500_usb"};
+       int i;
+       bool charger_present = false;
+       union power_supply_propval val;
+       struct power_supply *psy;
+       int ret;
+
+       if (sysctrl_dev == NULL) {
+               pr_err("%s: sysctrl not initialized\n", __func__);
+               return;
+       }
+
+       /*
+        * If we have a charger connected and we're powering off,
+        * reboot into charge-only mode.
+        */
+
+       for (i = 0; i < ARRAY_SIZE(pss); i++) {
+               psy = power_supply_get_by_name(pss[i]);
+               if (!psy)
+                       continue;
+
+               ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_ONLINE,
+                               &val);
+               power_supply_put(psy);
+
+               if (!ret && val.intval) {
+                       charger_present = true;
+                       break;
+               }
+       }
+
+       if (!charger_present)
+               goto shutdown;
+
+       /* Check if battery is known */
+       psy = power_supply_get_by_name("ab8500_btemp");
+       if (psy) {
+               ret = power_supply_get_property(psy,
+                               POWER_SUPPLY_PROP_TECHNOLOGY, &val);
+               if (!ret && val.intval != POWER_SUPPLY_TECHNOLOGY_UNKNOWN) {
+                       printk(KERN_INFO
+                              "Charger \"%s\" is connected with known battery."
+                              " Rebooting.\n",
+                              pss[i]);
+                       machine_restart("charging");
+               }
+               power_supply_put(psy);
+       }
+
+shutdown:
+       sigfillset(&all);
+
+       if (!sigprocmask(SIG_BLOCK, &all, &old)) {
+               (void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
+                                        AB8500_STW4500CTRL1_SWOFF |
+                                        AB8500_STW4500CTRL1_SWRESET4500N);
+               (void)sigprocmask(SIG_SETMASK, &old, NULL);
+       }
+}
+
+static inline bool valid_bank(u8 bank)
+{
+       return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
+               (bank == AB8500_SYS_CTRL2_BLOCK));
+}
+
+int ab8500_sysctrl_read(u16 reg, u8 *value)
+{
+       u8 bank;
+
+       if (sysctrl_dev == NULL)
+               return -EINVAL;
+
+       bank = (reg >> 8);
+       if (!valid_bank(bank))
+               return -EINVAL;
+
+       return abx500_get_register_interruptible(sysctrl_dev, bank,
+               (u8)(reg & 0xFF), value);
+}
+EXPORT_SYMBOL(ab8500_sysctrl_read);
+
+int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
+{
+       u8 bank;
+
+       if (sysctrl_dev == NULL)
+               return -EINVAL;
+
+       bank = (reg >> 8);
+       if (!valid_bank(bank))
+               return -EINVAL;
+
+       return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
+               (u8)(reg & 0xFF), mask, value);
+}
+EXPORT_SYMBOL(ab8500_sysctrl_write);
+
+static int ab8500_sysctrl_probe(struct platform_device *pdev)
+{
+       struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
+       struct ab8500_platform_data *plat;
+       struct ab8500_sysctrl_platform_data *pdata;
+
+       plat = dev_get_platdata(pdev->dev.parent);
+
+       if (!plat)
+               return -EINVAL;
+
+       sysctrl_dev = &pdev->dev;
+
+       if (!pm_power_off)
+               pm_power_off = ab8500_power_off;
+
+       pdata = plat->sysctrl;
+       if (pdata) {
+               int last, ret, i, j;
+
+               if (is_ab8505(ab8500))
+                       last = AB8500_SYSCLKREQ4RFCLKBUF;
+               else
+                       last = AB8500_SYSCLKREQ8RFCLKBUF;
+
+               for (i = AB8500_SYSCLKREQ1RFCLKBUF; i <= last; i++) {
+                       j = i - AB8500_SYSCLKREQ1RFCLKBUF;
+                       ret = ab8500_sysctrl_write(i, 0xff,
+                                       pdata->initial_req_buf_config[j]);
+                       dev_dbg(&pdev->dev,
+                                       "Setting SysClkReq%dRfClkBuf 0x%X\n",
+                                       j + 1,
+                                       pdata->initial_req_buf_config[j]);
+                       if (ret < 0) {
+                               dev_err(&pdev->dev,
+                                       "unable to set sysClkReq%dRfClkBuf: "
+                                       "%d\n", j + 1, ret);
+                       }
+               }
+       }
+
+       return 0;
+}
+
+static int ab8500_sysctrl_remove(struct platform_device *pdev)
+{
+       sysctrl_dev = NULL;
+
+       if (pm_power_off == ab8500_power_off)
+               pm_power_off = NULL;
+
+       return 0;
+}
+
+static struct platform_driver ab8500_sysctrl_driver = {
+       .driver = {
+               .name = "ab8500-sysctrl",
+       },
+       .probe = ab8500_sysctrl_probe,
+       .remove = ab8500_sysctrl_remove,
+};
+
+static int __init ab8500_sysctrl_init(void)
+{
+       return platform_driver_register(&ab8500_sysctrl_driver);
+}
+arch_initcall(ab8500_sysctrl_init);
+
+MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
+MODULE_DESCRIPTION("AB8500 system control driver");
+MODULE_LICENSE("GPL v2");