Commit 02b0b79c authored by Stephen Boyd's avatar Stephen Boyd Committed by Dmitry Torokhov
Browse files

Input: pmic8xxx-pwrkey - support shutdown 



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: default avatarStephen Boyd <sboyd@codeaurora.org>
Reviewed-by: default avatarBjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent c57d5621

drivers/input/misc/pmic8xxx-pwrkey.c

+266 −2
Original line number Diff line number Diff line
@@ -20,17 +20,72 @@ 
#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,

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