Re: [PATCH v2] Input: pmic8xxx-pwrkey - Support shutdown

[Stephen Boyd <sboyd@codeaurora.org>]

On 07/13/2015 05:25 PM, Dmitry Torokhov wrote:

>> @@ -76,6 +131,220 @@ 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;
> Can we call this variable "error" please?

Ok.

>
>> +	}
>> +
>> +	/*
>> +	 * 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;
> Why does it need to be initialized? And "error" too please.

Doesn't need to be.

>
>> +
>> +	/* 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;
> And here.

Ok.

>
>> +	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);
>> +
> Stray empty line.

Ok.

>
>> +}
>> +
>> +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);
>> +
> Can we please keep IDs and device table where it was, close to the
> driver definition?

That would require forward declaring the array here. Is that desired? I 
moved it so that I could use it in the probe function.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project