| // SPDX-License-Identifier: GPL-2.0-only |
| /* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/slab.h> |
| #include <linux/input.h> |
| #include <linux/interrupt.h> |
| #include <linux/platform_device.h> |
| #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) |
| { |
| struct input_dev *pwr = _pwr; |
| |
| input_report_key(pwr, KEY_POWER, 1); |
| input_sync(pwr); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static irqreturn_t pwrkey_release_irq(int irq, void *_pwr) |
| { |
| struct input_dev *pwr = _pwr; |
| |
| input_report_key(pwr, KEY_POWER, 0); |
| input_sync(pwr); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static int pmic8xxx_pwrkey_suspend(struct device *dev) |
| { |
| struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev); |
| |
| if (device_may_wakeup(dev)) |
| enable_irq_wake(pwrkey->key_press_irq); |
| |
| return 0; |
| } |
| |
| static int pmic8xxx_pwrkey_resume(struct device *dev) |
| { |
| struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev); |
| |
| if (device_may_wakeup(dev)) |
| disable_irq_wake(pwrkey->key_press_irq); |
| |
| return 0; |
| } |
| |
| static DEFINE_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, ®); |
| 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, ®); |
| 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; |
| int key_release_irq = platform_get_irq(pdev, 0); |
| int key_press_irq = platform_get_irq(pdev, 1); |
| int err; |
| unsigned int delay; |
| unsigned int pon_cntl; |
| struct regmap *regmap; |
| struct pmic8xxx_pwrkey *pwrkey; |
| u32 kpd_delay; |
| bool pull_up; |
| |
| if (of_property_read_u32(pdev->dev.of_node, "debounce", &kpd_delay)) |
| kpd_delay = 15625; |
| |
| /* Valid range of pwr key trigger delay is 1/64 sec to 2 seconds. */ |
| if (kpd_delay > USEC_PER_SEC * 2 || kpd_delay < USEC_PER_SEC / 64) { |
| dev_err(&pdev->dev, "invalid power key trigger delay\n"); |
| return -EINVAL; |
| } |
| |
| pull_up = of_property_read_bool(pdev->dev.of_node, "pull-up"); |
| |
| regmap = dev_get_regmap(pdev->dev.parent, NULL); |
| if (!regmap) { |
| dev_err(&pdev->dev, "failed to locate regmap for the device\n"); |
| return -ENODEV; |
| } |
| |
| pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL); |
| 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); |
| if (!pwr) { |
| dev_dbg(&pdev->dev, "Can't allocate power button\n"); |
| return -ENOMEM; |
| } |
| |
| input_set_capability(pwr, EV_KEY, KEY_POWER); |
| |
| pwr->name = "pmic8xxx_pwrkey"; |
| pwr->phys = "pmic8xxx_pwrkey/input0"; |
| |
| delay = (kpd_delay << 6) / USEC_PER_SEC; |
| delay = ilog2(delay); |
| |
| err = regmap_read(regmap, PON_CNTL_1, &pon_cntl); |
| if (err < 0) { |
| dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err); |
| return err; |
| } |
| |
| pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK; |
| pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK); |
| if (pull_up) |
| pon_cntl |= PON_CNTL_PULL_UP; |
| else |
| pon_cntl &= ~PON_CNTL_PULL_UP; |
| |
| err = regmap_write(regmap, PON_CNTL_1, pon_cntl); |
| if (err < 0) { |
| dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err); |
| return err; |
| } |
| |
| err = devm_request_irq(&pdev->dev, key_press_irq, pwrkey_press_irq, |
| IRQF_TRIGGER_RISING, |
| "pmic8xxx_pwrkey_press", pwr); |
| if (err) { |
| dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n", |
| key_press_irq, err); |
| return err; |
| } |
| |
| err = devm_request_irq(&pdev->dev, key_release_irq, pwrkey_release_irq, |
| IRQF_TRIGGER_RISING, |
| "pmic8xxx_pwrkey_release", pwr); |
| if (err) { |
| dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n", |
| key_release_irq, err); |
| return err; |
| } |
| |
| err = input_register_device(pwr); |
| if (err) { |
| dev_err(&pdev->dev, "Can't register power key: %d\n", err); |
| return err; |
| } |
| |
| platform_set_drvdata(pdev, pwrkey); |
| device_init_wakeup(&pdev->dev, 1); |
| |
| return 0; |
| } |
| |
| 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 struct platform_driver pmic8xxx_pwrkey_driver = { |
| .probe = pmic8xxx_pwrkey_probe, |
| .shutdown = pmic8xxx_pwrkey_shutdown, |
| .driver = { |
| .name = "pm8xxx-pwrkey", |
| .pm = pm_sleep_ptr(&pm8xxx_pwr_key_pm_ops), |
| .of_match_table = pm8xxx_pwr_key_id_table, |
| }, |
| }; |
| module_platform_driver(pmic8xxx_pwrkey_driver); |
| |
| MODULE_ALIAS("platform:pmic8xxx_pwrkey"); |
| MODULE_DESCRIPTION("PMIC8XXX Power Key driver"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>"); |