Input: pmic8xxx-pwrkey - support shutdown
authorStephen Boyd <sboyd@codeaurora.org>
Fri, 17 Jul 2015 21:59:18 +0000 (14:59 -0700)
committerDmitry Torokhov <dmitry.torokhov@gmail.com>
Thu, 23 Jul 2015 21:58:35 +0000 (14:58 -0700)
On pm8xxx PMICs, shutdown and restart are signaled to the PMIC via a pin
called PS_HOLD. When this pin goes low, the PMIC performs a configurable
power sequence. Add a .shutdown hook so that we can properly configure this
power sequence for shutdown or restart depending on the system state.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
drivers/input/misc/pmic8xxx-pwrkey.c

index c4ca20e63221715d682a3fd0f9c8dbf708dcceda..3f02e0e03d128afaee7439e509f00d22f23e9e59 100644 (file)
 #include <linux/regmap.h>
 #include <linux/log2.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 
 #define PON_CNTL_1 0x1C
 #define PON_CNTL_PULL_UP BIT(7)
 #define PON_CNTL_TRIG_DELAY_MASK (0x7)
+#define PON_CNTL_1_PULL_UP_EN                  0xe0
+#define PON_CNTL_1_USB_PWR_EN                  0x10
+#define PON_CNTL_1_WD_EN_RESET                 0x08
+
+#define PM8058_SLEEP_CTRL                      0x02b
+#define PM8921_SLEEP_CTRL                      0x10a
+
+#define SLEEP_CTRL_SMPL_EN_RESET               0x04
+
+/* Regulator master enable addresses */
+#define REG_PM8058_VREG_EN_MSM                 0x018
+#define REG_PM8058_VREG_EN_GRP_5_4             0x1c8
+
+/* Regulator control registers for shutdown/reset */
+#define PM8058_S0_CTRL                         0x004
+#define PM8058_S1_CTRL                         0x005
+#define PM8058_S3_CTRL                         0x111
+#define PM8058_L21_CTRL                                0x120
+#define PM8058_L22_CTRL                                0x121
+
+#define PM8058_REGULATOR_ENABLE_MASK           0x80
+#define PM8058_REGULATOR_ENABLE                        0x80
+#define PM8058_REGULATOR_DISABLE               0x00
+#define PM8058_REGULATOR_PULL_DOWN_MASK                0x40
+#define PM8058_REGULATOR_PULL_DOWN_EN          0x40
+
+/* Buck CTRL register */
+#define PM8058_SMPS_LEGACY_VREF_SEL            0x20
+#define PM8058_SMPS_LEGACY_VPROG_MASK          0x1f
+#define PM8058_SMPS_ADVANCED_BAND_MASK         0xC0
+#define PM8058_SMPS_ADVANCED_BAND_SHIFT                6
+#define PM8058_SMPS_ADVANCED_VPROG_MASK                0x3f
+
+/* Buck TEST2 registers for shutdown/reset */
+#define PM8058_S0_TEST2                                0x084
+#define PM8058_S1_TEST2                                0x085
+#define PM8058_S3_TEST2                                0x11a
+
+#define PM8058_REGULATOR_BANK_WRITE            0x80
+#define PM8058_REGULATOR_BANK_MASK             0x70
+#define PM8058_REGULATOR_BANK_SHIFT            4
+#define PM8058_REGULATOR_BANK_SEL(n)   ((n) << PM8058_REGULATOR_BANK_SHIFT)
+
+/* Buck TEST2 register bank 1 */
+#define PM8058_SMPS_LEGACY_VLOW_SEL            0x01
+
+/* Buck TEST2 register bank 7 */
+#define PM8058_SMPS_ADVANCED_MODE_MASK         0x02
+#define PM8058_SMPS_ADVANCED_MODE              0x02
+#define PM8058_SMPS_LEGACY_MODE                        0x00
 
 /**
  * struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
  * @key_press_irq: key press irq number
+ * @regmap: device regmap
+ * @shutdown_fn: shutdown configuration function
  */
 struct pmic8xxx_pwrkey {
        int key_press_irq;
+       struct regmap *regmap;
+       int (*shutdown_fn)(struct pmic8xxx_pwrkey *, bool);
 };
 
 static irqreturn_t pwrkey_press_irq(int irq, void *_pwr)
@@ -76,6 +131,212 @@ static int __maybe_unused pmic8xxx_pwrkey_resume(struct device *dev)
 static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
                pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
 
+static void pmic8xxx_pwrkey_shutdown(struct platform_device *pdev)
+{
+       struct pmic8xxx_pwrkey *pwrkey = platform_get_drvdata(pdev);
+       int error;
+       u8 mask, val;
+       bool reset = system_state == SYSTEM_RESTART;
+
+       if (pwrkey->shutdown_fn) {
+               error = pwrkey->shutdown_fn(pwrkey, reset);
+               if (error)
+                       return;
+       }
+
+       /*
+        * Select action to perform (reset or shutdown) when PS_HOLD goes low.
+        * Also ensure that KPD, CBL0, and CBL1 pull ups are enabled and that
+        * USB charging is enabled.
+        */
+       mask = PON_CNTL_1_PULL_UP_EN | PON_CNTL_1_USB_PWR_EN;
+       mask |= PON_CNTL_1_WD_EN_RESET;
+       val = mask;
+       if (!reset)
+               val &= ~PON_CNTL_1_WD_EN_RESET;
+
+       regmap_update_bits(pwrkey->regmap, PON_CNTL_1, mask, val);
+}
+
+/*
+ * Set an SMPS regulator to be disabled in its CTRL register, but enabled
+ * in the master enable register.  Also set it's pull down enable bit.
+ * Take care to make sure that the output voltage doesn't change if switching
+ * from advanced mode to legacy mode.
+ */
+static int pm8058_disable_smps_locally_set_pull_down(struct regmap *regmap,
+       u16 ctrl_addr, u16 test2_addr, u16 master_enable_addr,
+       u8 master_enable_bit)
+{
+       int error;
+       u8 vref_sel, vlow_sel, band, vprog, bank;
+       unsigned int reg;
+
+       bank = PM8058_REGULATOR_BANK_SEL(7);
+       error = regmap_write(regmap, test2_addr, bank);
+       if (error)
+               return error;
+
+       error = regmap_read(regmap, test2_addr, &reg);
+       if (error)
+               return error;
+
+       reg &= PM8058_SMPS_ADVANCED_MODE_MASK;
+       /* Check if in advanced mode. */
+       if (reg == PM8058_SMPS_ADVANCED_MODE) {
+               /* Determine current output voltage. */
+               error = regmap_read(regmap, ctrl_addr, &reg);
+               if (error)
+                       return error;
+
+               band = reg & PM8058_SMPS_ADVANCED_BAND_MASK;
+               band >>= PM8058_SMPS_ADVANCED_BAND_SHIFT;
+               switch (band) {
+               case 3:
+                       vref_sel = 0;
+                       vlow_sel = 0;
+                       break;
+               case 2:
+                       vref_sel = PM8058_SMPS_LEGACY_VREF_SEL;
+                       vlow_sel = 0;
+                       break;
+               case 1:
+                       vref_sel = PM8058_SMPS_LEGACY_VREF_SEL;
+                       vlow_sel = PM8058_SMPS_LEGACY_VLOW_SEL;
+                       break;
+               default:
+                       pr_err("%s: regulator already disabled\n", __func__);
+                       return -EPERM;
+               }
+               vprog = reg & PM8058_SMPS_ADVANCED_VPROG_MASK;
+               /* Round up if fine step is in use. */
+               vprog = (vprog + 1) >> 1;
+               if (vprog > PM8058_SMPS_LEGACY_VPROG_MASK)
+                       vprog = PM8058_SMPS_LEGACY_VPROG_MASK;
+
+               /* Set VLOW_SEL bit. */
+               bank = PM8058_REGULATOR_BANK_SEL(1);
+               error = regmap_write(regmap, test2_addr, bank);
+               if (error)
+                       return error;
+
+               error = regmap_update_bits(regmap, test2_addr,
+                       PM8058_REGULATOR_BANK_WRITE | PM8058_REGULATOR_BANK_MASK
+                               | PM8058_SMPS_LEGACY_VLOW_SEL,
+                       PM8058_REGULATOR_BANK_WRITE |
+                       PM8058_REGULATOR_BANK_SEL(1) | vlow_sel);
+               if (error)
+                       return error;
+
+               /* Switch to legacy mode */
+               bank = PM8058_REGULATOR_BANK_SEL(7);
+               error = regmap_write(regmap, test2_addr, bank);
+               if (error)
+                       return error;
+
+               error = regmap_update_bits(regmap, test2_addr,
+                               PM8058_REGULATOR_BANK_WRITE |
+                               PM8058_REGULATOR_BANK_MASK |
+                               PM8058_SMPS_ADVANCED_MODE_MASK,
+                               PM8058_REGULATOR_BANK_WRITE |
+                               PM8058_REGULATOR_BANK_SEL(7) |
+                               PM8058_SMPS_LEGACY_MODE);
+               if (error)
+                       return error;
+
+               /* Enable locally, enable pull down, keep voltage the same. */
+               error = regmap_update_bits(regmap, ctrl_addr,
+                       PM8058_REGULATOR_ENABLE_MASK |
+                       PM8058_REGULATOR_PULL_DOWN_MASK |
+                       PM8058_SMPS_LEGACY_VREF_SEL |
+                       PM8058_SMPS_LEGACY_VPROG_MASK,
+                       PM8058_REGULATOR_ENABLE | PM8058_REGULATOR_PULL_DOWN_EN
+                               | vref_sel | vprog);
+               if (error)
+                       return error;
+       }
+
+       /* Enable in master control register. */
+       error = regmap_update_bits(regmap, master_enable_addr,
+                       master_enable_bit, master_enable_bit);
+       if (error)
+               return error;
+
+       /* Disable locally and enable pull down. */
+       return regmap_update_bits(regmap, ctrl_addr,
+               PM8058_REGULATOR_ENABLE_MASK | PM8058_REGULATOR_PULL_DOWN_MASK,
+               PM8058_REGULATOR_DISABLE | PM8058_REGULATOR_PULL_DOWN_EN);
+}
+
+static int pm8058_disable_ldo_locally_set_pull_down(struct regmap *regmap,
+               u16 ctrl_addr, u16 master_enable_addr, u8 master_enable_bit)
+{
+       int error;
+
+       /* Enable LDO in master control register. */
+       error = regmap_update_bits(regmap, master_enable_addr,
+                       master_enable_bit, master_enable_bit);
+       if (error)
+               return error;
+
+       /* Disable LDO in CTRL register and set pull down */
+       return regmap_update_bits(regmap, ctrl_addr,
+               PM8058_REGULATOR_ENABLE_MASK | PM8058_REGULATOR_PULL_DOWN_MASK,
+               PM8058_REGULATOR_DISABLE | PM8058_REGULATOR_PULL_DOWN_EN);
+}
+
+static int pm8058_pwrkey_shutdown(struct pmic8xxx_pwrkey *pwrkey, bool reset)
+{
+       int error;
+       struct regmap *regmap = pwrkey->regmap;
+       u8 mask, val;
+
+       /* When shutting down, enable active pulldowns on important rails. */
+       if (!reset) {
+               /* Disable SMPS's 0,1,3 locally and set pulldown enable bits. */
+               pm8058_disable_smps_locally_set_pull_down(regmap,
+                       PM8058_S0_CTRL, PM8058_S0_TEST2,
+                       REG_PM8058_VREG_EN_MSM, BIT(7));
+               pm8058_disable_smps_locally_set_pull_down(regmap,
+                       PM8058_S1_CTRL, PM8058_S1_TEST2,
+                       REG_PM8058_VREG_EN_MSM, BIT(6));
+               pm8058_disable_smps_locally_set_pull_down(regmap,
+                       PM8058_S3_CTRL, PM8058_S3_TEST2,
+                       REG_PM8058_VREG_EN_GRP_5_4, BIT(7) | BIT(4));
+               /* Disable LDO 21 locally and set pulldown enable bit. */
+               pm8058_disable_ldo_locally_set_pull_down(regmap,
+                       PM8058_L21_CTRL, REG_PM8058_VREG_EN_GRP_5_4,
+                       BIT(1));
+       }
+
+       /*
+        * Fix-up: Set regulator LDO22 to 1.225 V in high power mode. Leave its
+        * pull-down state intact. This ensures a safe shutdown.
+        */
+       error = regmap_update_bits(regmap, PM8058_L22_CTRL, 0xbf, 0x93);
+       if (error)
+               return error;
+
+       /* Enable SMPL if resetting is desired */
+       mask = SLEEP_CTRL_SMPL_EN_RESET;
+       val = 0;
+       if (reset)
+               val = mask;
+       return regmap_update_bits(regmap, PM8058_SLEEP_CTRL, mask, val);
+}
+
+static int pm8921_pwrkey_shutdown(struct pmic8xxx_pwrkey *pwrkey, bool reset)
+{
+       struct regmap *regmap = pwrkey->regmap;
+       u8 mask = SLEEP_CTRL_SMPL_EN_RESET;
+       u8 val = 0;
+
+       /* Enable SMPL if resetting is desired */
+       if (reset)
+               val = mask;
+       return regmap_update_bits(regmap, PM8921_SLEEP_CTRL, mask, val);
+}
+
 static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
 {
        struct input_dev *pwr;
@@ -109,6 +370,8 @@ static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
        if (!pwrkey)
                return -ENOMEM;
 
+       pwrkey->shutdown_fn = of_device_get_match_data(&pdev->dev);
+       pwrkey->regmap = regmap;
        pwrkey->key_press_irq = key_press_irq;
 
        pwr = devm_input_allocate_device(&pdev->dev);
@@ -182,8 +445,8 @@ static int pmic8xxx_pwrkey_remove(struct platform_device *pdev)
 }
 
 static const struct of_device_id pm8xxx_pwr_key_id_table[] = {
-       { .compatible = "qcom,pm8058-pwrkey" },
-       { .compatible = "qcom,pm8921-pwrkey" },
+       { .compatible = "qcom,pm8058-pwrkey", .data = &pm8058_pwrkey_shutdown },
+       { .compatible = "qcom,pm8921-pwrkey", .data = &pm8921_pwrkey_shutdown },
        { }
 };
 MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table);
@@ -191,6 +454,7 @@ MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table);
 static struct platform_driver pmic8xxx_pwrkey_driver = {
        .probe          = pmic8xxx_pwrkey_probe,
        .remove         = pmic8xxx_pwrkey_remove,
+       .shutdown       = pmic8xxx_pwrkey_shutdown,
        .driver         = {
                .name   = "pm8xxx-pwrkey",
                .pm     = &pm8xxx_pwr_key_pm_ops,