[PATCH] Input: pmic8xxx-pwrkey - Support shutdown

From: Stephen Boyd
Date: Mon Jul 06 2015 - 21:09:07 EST

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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@xxxxxxxxxxxxxx>
---
drivers/input/misc/pmic8xxx-pwrkey.c | 287 ++++++++++++++++++++++++++++++++++-
1 file changed, 280 insertions(+), 7 deletions(-)

diff --git a/drivers/input/misc/pmic8xxx-pwrkey.c b/drivers/input/misc/pmic8xxx-pwrkey.c
index c4ca20e63221..ce0492031bc3 100644
--- a/drivers/input/misc/pmic8xxx-pwrkey.c
+++ b/drivers/input/misc/pmic8xxx-pwrkey.c
@@ -20,17 +20,75 @@
#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
*/
struct pmic8xxx_pwrkey {
int key_press_irq;
+ struct regmap *regmap;
+ int (*shutdown_fn)(struct pmic8xxx_pwrkey *, bool);
+};
+
+struct pm8xxx_nbs {
+ int (*shutdown_fn)(struct pmic8xxx_pwrkey *, bool);
};

static irqreturn_t pwrkey_press_irq(int irq, void *_pwr)
@@ -76,6 +134,220 @@ 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 ret;
+ u8 mask, val;
+ bool reset = system_state == SYSTEM_RESTART;
+
+ if (pwrkey->shutdown_fn) {
+ ret = pwrkey->shutdown_fn(pwrkey, reset);
+ if (ret)
+ 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 ret = 0;
+ u8 vref_sel, vlow_sel, band, vprog, bank;
+ unsigned int reg;
+
+ bank = PM8058_REGULATOR_BANK_SEL(7);
+ ret = regmap_write(regmap, test2_addr, bank);
+ if (ret)
+ return ret;
+
+ ret = regmap_read(regmap, test2_addr, &reg);
+ if (ret)
+ return ret;
+
+ reg &= PM8058_SMPS_ADVANCED_MODE_MASK;
+ /* Check if in advanced mode. */
+ if (reg == PM8058_SMPS_ADVANCED_MODE) {
+ /* Determine current output voltage. */
+ ret = regmap_read(regmap, ctrl_addr, &reg);
+ if (ret)
+ return ret;
+
+ 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);
+ ret = regmap_write(regmap, test2_addr, bank);
+ if (ret)
+ return ret;
+
+ ret = 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 (ret)
+ return ret;
+
+ /* Switch to legacy mode */
+ bank = PM8058_REGULATOR_BANK_SEL(7);
+ ret = regmap_write(regmap, test2_addr, bank);
+ if (ret)
+ return ret;
+
+ ret = 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 (ret)
+ return ret;
+
+ /* Enable locally, enable pull down, keep voltage the same. */
+ ret = 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 (ret)
+ return ret;
+ }
+
+ /* Enable in master control register. */
+ ret = regmap_update_bits(regmap, master_enable_addr,
+ master_enable_bit, master_enable_bit);
+ if (ret)
+ return ret;
+
+ /* 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 ret;
+
+ /* Enable LDO in master control register. */
+ ret = regmap_update_bits(regmap, master_enable_addr,
+ master_enable_bit, master_enable_bit);
+ if (ret)
+ return ret;
+
+ /* 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 ret;
+ 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.
+ */
+ ret = regmap_update_bits(regmap, PM8058_L22_CTRL, 0xbf, 0x93);
+ if (ret)
+ return ret;
+
+ /* 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 const struct of_device_id pm8xxx_pwr_key_id_table[] = {
+ { .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);
+
static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
{
struct input_dev *pwr;
@@ -88,6 +360,11 @@ static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
struct pmic8xxx_pwrkey *pwrkey;
u32 kpd_delay;
bool pull_up;
+ const struct of_device_id *match;
+
+ match = of_match_device(pm8xxx_pwr_key_id_table, &pdev->dev);
+ if (!match)
+ return -ENODEV;

if (of_property_read_u32(pdev->dev.of_node, "debounce", &kpd_delay))
kpd_delay = 15625;
@@ -109,6 +386,8 @@ static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
if (!pwrkey)
return -ENOMEM;

+ pwrkey->shutdown_fn = match->data;
+ pwrkey->regmap = regmap;
pwrkey->key_press_irq = key_press_irq;

pwr = devm_input_allocate_device(&pdev->dev);
@@ -181,16 +460,10 @@ static int pmic8xxx_pwrkey_remove(struct platform_device *pdev)
return 0;
}

-static const struct of_device_id pm8xxx_pwr_key_id_table[] = {
- { .compatible = "qcom,pm8058-pwrkey" },
- { .compatible = "qcom,pm8921-pwrkey" },
- { }
-};
-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,
--
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a Linux Foundation Collaborative Project

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