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Input: pmic8xxx-pwrkey - support shutdown

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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@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Stephen Boyd 2015-07-17 14:59:18 -07:00 committed by Dmitry Torokhov
parent c57d5621d2
commit 02b0b79c30
1 changed files with 266 additions and 2 deletions
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268
drivers/input/misc/pmic8xxx-pwrkey.c
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@ -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,