8 files changed, 361 insertions, 10 deletions

diff --git a/Documentation/devicetree/bindings/arm/atmel-at91.txt b/Documentation/devicetree/bindings/arm/atmel-at91.txt
index 1d8004633479..e1f5ad855f14 100644
--- a/Documentation/devicetree/bindings/arm/atmel-at91.txt
+++ b/Documentation/devicetree/bindings/arm/atmel-at91.txt
@@ -151,6 +151,65 @@ Example:
                 clocks = <&clk32k>;
         };
 
+SHDWC SAMA5D2-Compatible Shutdown Controller
+
+1) shdwc node
+
+required properties:
+- compatible: should be "atmel,sama5d2-shdwc".
+- reg: should contain registers location and length
+- clocks: phandle to input clock.
+- #address-cells: should be one. The cell is the wake-up input index.
+- #size-cells: should be zero.
+
+optional properties:
+
+- debounce-delay-us: minimum wake-up inputs debouncer period in
+  microseconds. It's usually a board-related property.
+- atmel,wakeup-rtc-timer: boolean to enable Real-Time Clock wake-up.
+
+The node contains child nodes for each wake-up input that the platform uses.
+
+2) input nodes
+
+Wake-up input nodes are usually described in the "board" part of the Device
+Tree. Note also that input 0 is linked to the wake-up pin and is frequently
+used.
+
+Required properties:
+- reg: should contain the wake-up input index [0 - 15].
+
+Optional properties:
+- atmel,wakeup-active-high: boolean, the corresponding wake-up input described
+  by the child, forces the wake-up of the core power supply on a high level.
+  The default is to be active low.
+
+Example:
+
+On the SoC side:
+        shdwc@f8048010 {
+                compatible = "atmel,sama5d2-shdwc";
+                reg = <0xf8048010 0x10>;
+                clocks = <&clk32k>;
+                #address-cells = <1>;
+                #size-cells = <0>;
+                atmel,wakeup-rtc-timer;
+        };
+
+On the board side:
+        shdwc@f8048010 {
+                debounce-delay-us = <976>;
+
+                input@0 {
+                        reg = <0>;
+                };
+
+                input@1 {
+                        reg = <1>;
+                        atmel,wakeup-active-high;
+                };
+        };
+
 Special Function Registers (SFR)
 
 Special Function Registers (SFR) manage specific aspects of the integrated
diff --git a/MAINTAINERS b/MAINTAINERS
index 374ffa2d81b7..bb176dbfe81f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2048,6 +2048,11 @@ M:	Nicolas Ferre <nicolas.ferre@atmel.com>
 S:      Supported
 F:      drivers/tty/serial/atmel_serial.c
 
+ATMEL AT91 SAMA5D2-Compatible Shutdown Controller
+M:      Nicolas Ferre <nicolas.ferre@atmel.com>
+S:      Supported
+F:      drivers/power/reset/at91-sama5d2_shdwc.c
+
 ATMEL SAMA5D2 ADC DRIVER
 M:      Ludovic Desroches <ludovic.desroches@atmel.com>
 L:      linux-iio@vger.kernel.org
diff --git a/drivers/power/ipaq_micro_battery.c b/drivers/power/ipaq_micro_battery.c
index 3f314b1a30d7..35b01c7d775b 100644
--- a/drivers/power/ipaq_micro_battery.c
+++ b/drivers/power/ipaq_micro_battery.c
@@ -261,7 +261,7 @@ static int micro_batt_probe(struct platform_device *pdev)
         return 0;
 
 ac_err:
-        power_supply_unregister(micro_ac_power);
+        power_supply_unregister(micro_batt_power);
 batt_err:
         cancel_delayed_work_sync(&mb->update);
         destroy_workqueue(mb->wq);
diff --git a/drivers/power/max8925_power.c b/drivers/power/max8925_power.c
index 57eb5c2bfc21..3b94620ce5c1 100644
--- a/drivers/power/max8925_power.c
+++ b/drivers/power/max8925_power.c
@@ -540,14 +540,14 @@ static int max8925_power_probe(struct platform_device *pdev)
         info->usb = power_supply_register(&pdev->dev, &usb_desc, &psy_cfg);
         if (IS_ERR(info->usb)) {
                 ret = PTR_ERR(info->usb);
-                goto out_usb;
+                goto out_unregister_ac;
         }
         info->usb->dev.parent = &pdev->dev;
 
         info->battery = power_supply_register(&pdev->dev, &battery_desc, NULL);
         if (IS_ERR(info->battery)) {
                 ret = PTR_ERR(info->battery);
-                goto out_battery;
+                goto out_unregister_usb;
         }
         info->battery->dev.parent = &pdev->dev;
 
@@ -560,9 +560,9 @@ static int max8925_power_probe(struct platform_device *pdev)
 
         max8925_init_charger(chip, info);
         return 0;
-out_battery:
-        power_supply_unregister(info->battery);
-out_usb:
+out_unregister_usb:
+        power_supply_unregister(info->usb);
+out_unregister_ac:
         power_supply_unregister(info->ac);
 out:
         return ret;
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index 0a6408a39c66..9bb2622c23bf 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -30,6 +30,14 @@ config POWER_RESET_AT91_RESET
           This driver supports restart for Atmel AT91SAM9 and SAMA5
           SoCs
 
+config POWER_RESET_AT91_SAMA5D2_SHDWC
+        tristate "Atmel AT91 SAMA5D2-Compatible shutdown controller driver"
+        depends on ARCH_AT91 || COMPILE_TEST
+        default SOC_SAMA5
+        help
+          This driver supports the alternate shutdown controller for some Atmel
+          SAMA5 SoCs. It is present for example on SAMA5D2 SoC.
+
 config POWER_RESET_AXXIA
         bool "LSI Axxia reset driver"
         depends on ARCH_AXXIA
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index 096fa67047f6..ab7aa8614d1f 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -1,6 +1,7 @@
 obj-$(CONFIG_POWER_RESET_AS3722) += as3722-poweroff.o
 obj-$(CONFIG_POWER_RESET_AT91_POWEROFF) += at91-poweroff.o
 obj-$(CONFIG_POWER_RESET_AT91_RESET) += at91-reset.o
+obj-$(CONFIG_POWER_RESET_AT91_SAMA5D2_SHDWC) += at91-sama5d2_shdwc.o
 obj-$(CONFIG_POWER_RESET_AXXIA) += axxia-reset.o
 obj-$(CONFIG_POWER_RESET_BRCMSTB) += brcmstb-reboot.o
 obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
diff --git a/drivers/power/reset/at91-sama5d2_shdwc.c b/drivers/power/reset/at91-sama5d2_shdwc.c
new file mode 100644
index 000000000000..8a5ac9706c9c
--- /dev/null
+++ b/drivers/power/reset/at91-sama5d2_shdwc.c
@@ -0,0 +1,282 @@
+/*
+ * Atmel SAMA5D2-Compatible Shutdown Controller (SHDWC) driver.
+ * Found on some SoCs as the sama5d2 (obviously).
+ *
+ * Copyright (C) 2015 Atmel Corporation,
+ *                    Nicolas Ferre <nicolas.ferre@atmel.com>
+ *
+ * Evolved from driver at91-poweroff.c.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ *
+ * TODO:
+ * - addition to status of other wake-up inputs [1 - 15]
+ * - Analog Comparator wake-up alarm
+ * - Serial RX wake-up alarm
+ * - low power debouncer
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/printk.h>
+
+#define SLOW_CLOCK_FREQ 32768
+
+#define AT91_SHDW_CR    0x00            /* Shut Down Control Register */
+#define AT91_SHDW_SHDW          BIT(0)                  /* Shut Down command */
+#define AT91_SHDW_KEY           (0xa5UL << 24)          /* KEY Password */
+
+#define AT91_SHDW_MR    0x04            /* Shut Down Mode Register */
+#define AT91_SHDW_WKUPDBC_SHIFT 24
+#define AT91_SHDW_WKUPDBC_MASK  GENMASK(31, 16)
+#define AT91_SHDW_WKUPDBC(x)    (((x) << AT91_SHDW_WKUPDBC_SHIFT) \
+                                                & AT91_SHDW_WKUPDBC_MASK)
+
+#define AT91_SHDW_SR    0x08            /* Shut Down Status Register */
+#define AT91_SHDW_WKUPIS_SHIFT  16
+#define AT91_SHDW_WKUPIS_MASK   GENMASK(31, 16)
+#define AT91_SHDW_WKUPIS(x)     ((1 << (x)) << AT91_SHDW_WKUPIS_SHIFT \
+                                                & AT91_SHDW_WKUPIS_MASK)
+
+#define AT91_SHDW_WUIR  0x0c            /* Shutdown Wake-up Inputs Register */
+#define AT91_SHDW_WKUPEN_MASK   GENMASK(15, 0)
+#define AT91_SHDW_WKUPEN(x)     ((1 << (x)) & AT91_SHDW_WKUPEN_MASK)
+#define AT91_SHDW_WKUPT_SHIFT   16
+#define AT91_SHDW_WKUPT_MASK    GENMASK(31, 16)
+#define AT91_SHDW_WKUPT(x)      ((1 << (x)) << AT91_SHDW_WKUPT_SHIFT \
+                                                & AT91_SHDW_WKUPT_MASK)
+
+#define SHDW_WK_PIN(reg, cfg)   ((reg) & AT91_SHDW_WKUPIS((cfg)->wkup_pin_input))
+#define SHDW_RTCWK(reg, cfg)    (((reg) >> ((cfg)->sr_rtcwk_shift)) & 0x1)
+#define SHDW_RTCWKEN(cfg)       (1 << ((cfg)->mr_rtcwk_shift))
+
+#define DBC_PERIOD_US(x)        DIV_ROUND_UP_ULL((1000000 * (x)), \
+                                                        SLOW_CLOCK_FREQ)
+
+struct shdwc_config {
+        u8 wkup_pin_input;
+        u8 mr_rtcwk_shift;
+        u8 sr_rtcwk_shift;
+};
+
+struct shdwc {
+        struct shdwc_config *cfg;
+        void __iomem *at91_shdwc_base;
+};
+
+/*
+ * Hold configuration here, cannot be more than one instance of the driver
+ * since pm_power_off itself is global.
+ */
+static struct shdwc *at91_shdwc;
+static struct clk *sclk;
+
+static const unsigned long long sdwc_dbc_period[] = {
+        0, 3, 32, 512, 4096, 32768,
+};
+
+static void __init at91_wakeup_status(struct platform_device *pdev)
+{
+        struct shdwc *shdw = platform_get_drvdata(pdev);
+        u32 reg;
+        char *reason = "unknown";
+
+        reg = readl(shdw->at91_shdwc_base + AT91_SHDW_SR);
+
+        dev_dbg(&pdev->dev, "%s: status = %#x\n", __func__, reg);
+
+        /* Simple power-on, just bail out */
+        if (!reg)
+                return;
+
+        if (SHDW_WK_PIN(reg, shdw->cfg))
+                reason = "WKUP pin";
+        else if (SHDW_RTCWK(reg, shdw->cfg))
+                reason = "RTC";
+
+        pr_info("AT91: Wake-Up source: %s\n", reason);
+}
+
+static void at91_poweroff(void)
+{
+        writel(AT91_SHDW_KEY | AT91_SHDW_SHDW,
+               at91_shdwc->at91_shdwc_base + AT91_SHDW_CR);
+}
+
+static u32 at91_shdwc_debouncer_value(struct platform_device *pdev,
+                                      u32 in_period_us)
+{
+        int i;
+        int max_idx = ARRAY_SIZE(sdwc_dbc_period) - 1;
+        unsigned long long period_us;
+        unsigned long long max_period_us = DBC_PERIOD_US(sdwc_dbc_period[max_idx]);
+
+        if (in_period_us > max_period_us) {
+                dev_warn(&pdev->dev,
+                         "debouncer period %u too big, reduced to %llu us\n",
+                         in_period_us, max_period_us);
+                return max_idx;
+        }
+
+        for (i = max_idx - 1; i > 0; i--) {
+                period_us = DBC_PERIOD_US(sdwc_dbc_period[i]);
+                dev_dbg(&pdev->dev, "%s: ref[%d] = %llu\n",
+                                                __func__, i, period_us);
+                if (in_period_us > period_us)
+                        break;
+        }
+
+        return i + 1;
+}
+
+static u32 at91_shdwc_get_wakeup_input(struct platform_device *pdev,
+                                       struct device_node *np)
+{
+        struct device_node *cnp;
+        u32 wk_input_mask;
+        u32 wuir = 0;
+        u32 wk_input;
+
+        for_each_child_of_node(np, cnp) {
+                if (of_property_read_u32(cnp, "reg", &wk_input)) {
+                        dev_warn(&pdev->dev, "reg property is missing for %s\n",
+                                 cnp->full_name);
+                        continue;
+                }
+
+                wk_input_mask = 1 << wk_input;
+                if (!(wk_input_mask & AT91_SHDW_WKUPEN_MASK)) {
+                        dev_warn(&pdev->dev,
+                                 "wake-up input %d out of bounds ignore\n",
+                                 wk_input);
+                        continue;
+                }
+                wuir |= wk_input_mask;
+
+                if (of_property_read_bool(cnp, "atmel,wakeup-active-high"))
+                        wuir |= AT91_SHDW_WKUPT(wk_input);
+
+                dev_dbg(&pdev->dev, "%s: (child %d) wuir = %#x\n",
+                                                __func__, wk_input, wuir);
+        }
+
+        return wuir;
+}
+
+static void at91_shdwc_dt_configure(struct platform_device *pdev)
+{
+        struct shdwc *shdw = platform_get_drvdata(pdev);
+        struct device_node *np = pdev->dev.of_node;
+        u32 mode = 0, tmp, input;
+
+        if (!np) {
+                dev_err(&pdev->dev, "device node not found\n");
+                return;
+        }
+
+        if (!of_property_read_u32(np, "debounce-delay-us", &tmp))
+                mode |= AT91_SHDW_WKUPDBC(at91_shdwc_debouncer_value(pdev, tmp));
+
+        if (of_property_read_bool(np, "atmel,wakeup-rtc-timer"))
+                mode |= SHDW_RTCWKEN(shdw->cfg);
+
+        dev_dbg(&pdev->dev, "%s: mode = %#x\n", __func__, mode);
+        writel(mode, shdw->at91_shdwc_base + AT91_SHDW_MR);
+
+        input = at91_shdwc_get_wakeup_input(pdev, np);
+        writel(input, shdw->at91_shdwc_base + AT91_SHDW_WUIR);
+}
+
+static const struct shdwc_config sama5d2_shdwc_config = {
+        .wkup_pin_input = 0,
+        .mr_rtcwk_shift = 17,
+        .sr_rtcwk_shift = 5,
+};
+
+static const struct of_device_id at91_shdwc_of_match[] = {
+        {
+                .compatible = "atmel,sama5d2-shdwc",
+                .data = &sama5d2_shdwc_config,
+        }, {
+                /*sentinel*/
+        }
+};
+MODULE_DEVICE_TABLE(of, at91_shdwc_of_match);
+
+static int __init at91_shdwc_probe(struct platform_device *pdev)
+{
+        struct resource *res;
+        const struct of_device_id *match;
+        int ret;
+
+        if (!pdev->dev.of_node)
+                return -ENODEV;
+
+        at91_shdwc = devm_kzalloc(&pdev->dev, sizeof(*at91_shdwc), GFP_KERNEL);
+        if (!at91_shdwc)
+                return -ENOMEM;
+
+        platform_set_drvdata(pdev, at91_shdwc);
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        at91_shdwc->at91_shdwc_base = devm_ioremap_resource(&pdev->dev, res);
+        if (IS_ERR(at91_shdwc->at91_shdwc_base)) {
+                dev_err(&pdev->dev, "Could not map reset controller address\n");
+                return PTR_ERR(at91_shdwc->at91_shdwc_base);
+        }
+
+        match = of_match_node(at91_shdwc_of_match, pdev->dev.of_node);
+        at91_shdwc->cfg = (struct shdwc_config *)(match->data);
+
+        sclk = devm_clk_get(&pdev->dev, NULL);
+        if (IS_ERR(sclk))
+                return PTR_ERR(sclk);
+
+        ret = clk_prepare_enable(sclk);
+        if (ret) {
+                dev_err(&pdev->dev, "Could not enable slow clock\n");
+                return ret;
+        }
+
+        at91_wakeup_status(pdev);
+
+        at91_shdwc_dt_configure(pdev);
+
+        pm_power_off = at91_poweroff;
+
+        return 0;
+}
+
+static int __exit at91_shdwc_remove(struct platform_device *pdev)
+{
+        struct shdwc *shdw = platform_get_drvdata(pdev);
+
+        if (pm_power_off == at91_poweroff)
+                pm_power_off = NULL;
+
+        /* Reset values to disable wake-up features  */
+        writel(0, shdw->at91_shdwc_base + AT91_SHDW_MR);
+        writel(0, shdw->at91_shdwc_base + AT91_SHDW_WUIR);
+
+        clk_disable_unprepare(sclk);
+
+        return 0;
+}
+
+static struct platform_driver at91_shdwc_driver = {
+        .remove = __exit_p(at91_shdwc_remove),
+        .driver = {
+                .name = "at91-shdwc",
+                .of_match_table = at91_shdwc_of_match,
+        },
+};
+module_platform_driver_probe(at91_shdwc_driver, at91_shdwc_probe);
+
+MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
+MODULE_DESCRIPTION("Atmel shutdown controller driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/power/sbs-battery.c b/drivers/power/sbs-battery.c
index d6226d68b574..768b9fcb58ea 100644
--- a/drivers/power/sbs-battery.c
+++ b/drivers/power/sbs-battery.c
@@ -382,8 +382,6 @@ static int sbs_get_battery_property(struct i2c_client *client,
 
                 if (ret & BATTERY_FULL_CHARGED)
                         val->intval = POWER_SUPPLY_STATUS_FULL;
-                else if (ret & BATTERY_FULL_DISCHARGED)
-                        val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
                 else if (ret & BATTERY_DISCHARGING)
                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
                 else
@@ -702,8 +700,6 @@ static void sbs_delayed_work(struct work_struct *work)
 
         if (ret & BATTERY_FULL_CHARGED)
                 ret = POWER_SUPPLY_STATUS_FULL;
-        else if (ret & BATTERY_FULL_DISCHARGED)
-                ret = POWER_SUPPLY_STATUS_NOT_CHARGING;
         else if (ret & BATTERY_DISCHARGING)
                 ret = POWER_SUPPLY_STATUS_DISCHARGING;
         else