463 lines
13 KiB
C
463 lines
13 KiB
C
/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/log2.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#define PON_CNTL_1 0x1C
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#define PON_CNTL_PULL_UP BIT(7)
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#define PON_CNTL_TRIG_DELAY_MASK (0x7)
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#define PON_CNTL_1_PULL_UP_EN 0xe0
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#define PON_CNTL_1_USB_PWR_EN 0x10
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#define PON_CNTL_1_WD_EN_RESET 0x08
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#define PM8058_SLEEP_CTRL 0x02b
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#define PM8921_SLEEP_CTRL 0x10a
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#define SLEEP_CTRL_SMPL_EN_RESET 0x04
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/* Regulator master enable addresses */
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#define REG_PM8058_VREG_EN_MSM 0x018
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#define REG_PM8058_VREG_EN_GRP_5_4 0x1c8
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/* Regulator control registers for shutdown/reset */
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#define PM8058_S0_CTRL 0x004
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#define PM8058_S1_CTRL 0x005
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#define PM8058_S3_CTRL 0x111
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#define PM8058_L21_CTRL 0x120
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#define PM8058_L22_CTRL 0x121
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#define PM8058_REGULATOR_ENABLE_MASK 0x80
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#define PM8058_REGULATOR_ENABLE 0x80
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#define PM8058_REGULATOR_DISABLE 0x00
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#define PM8058_REGULATOR_PULL_DOWN_MASK 0x40
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#define PM8058_REGULATOR_PULL_DOWN_EN 0x40
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/* Buck CTRL register */
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#define PM8058_SMPS_LEGACY_VREF_SEL 0x20
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#define PM8058_SMPS_LEGACY_VPROG_MASK 0x1f
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#define PM8058_SMPS_ADVANCED_BAND_MASK 0xC0
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#define PM8058_SMPS_ADVANCED_BAND_SHIFT 6
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#define PM8058_SMPS_ADVANCED_VPROG_MASK 0x3f
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/* Buck TEST2 registers for shutdown/reset */
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#define PM8058_S0_TEST2 0x084
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#define PM8058_S1_TEST2 0x085
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#define PM8058_S3_TEST2 0x11a
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#define PM8058_REGULATOR_BANK_WRITE 0x80
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#define PM8058_REGULATOR_BANK_MASK 0x70
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#define PM8058_REGULATOR_BANK_SHIFT 4
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#define PM8058_REGULATOR_BANK_SEL(n) ((n) << PM8058_REGULATOR_BANK_SHIFT)
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/* Buck TEST2 register bank 1 */
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#define PM8058_SMPS_LEGACY_VLOW_SEL 0x01
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/* Buck TEST2 register bank 7 */
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#define PM8058_SMPS_ADVANCED_MODE_MASK 0x02
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#define PM8058_SMPS_ADVANCED_MODE 0x02
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#define PM8058_SMPS_LEGACY_MODE 0x00
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/**
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* struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
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* @key_press_irq: key press irq number
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* @regmap: device regmap
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* @shutdown_fn: shutdown configuration function
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*/
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struct pmic8xxx_pwrkey {
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int key_press_irq;
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struct regmap *regmap;
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int (*shutdown_fn)(struct pmic8xxx_pwrkey *, bool);
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};
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static irqreturn_t pwrkey_press_irq(int irq, void *_pwr)
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{
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struct input_dev *pwr = _pwr;
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input_report_key(pwr, KEY_POWER, 1);
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input_sync(pwr);
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return IRQ_HANDLED;
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}
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static irqreturn_t pwrkey_release_irq(int irq, void *_pwr)
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{
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struct input_dev *pwr = _pwr;
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input_report_key(pwr, KEY_POWER, 0);
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input_sync(pwr);
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return IRQ_HANDLED;
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}
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static int __maybe_unused pmic8xxx_pwrkey_suspend(struct device *dev)
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{
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struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
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if (device_may_wakeup(dev))
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enable_irq_wake(pwrkey->key_press_irq);
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return 0;
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}
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static int __maybe_unused pmic8xxx_pwrkey_resume(struct device *dev)
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{
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struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
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if (device_may_wakeup(dev))
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disable_irq_wake(pwrkey->key_press_irq);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
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pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
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static void pmic8xxx_pwrkey_shutdown(struct platform_device *pdev)
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{
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struct pmic8xxx_pwrkey *pwrkey = platform_get_drvdata(pdev);
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int error;
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u8 mask, val;
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bool reset = system_state == SYSTEM_RESTART;
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if (pwrkey->shutdown_fn) {
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error = pwrkey->shutdown_fn(pwrkey, reset);
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if (error)
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return;
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}
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/*
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* Select action to perform (reset or shutdown) when PS_HOLD goes low.
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* Also ensure that KPD, CBL0, and CBL1 pull ups are enabled and that
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* USB charging is enabled.
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*/
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mask = PON_CNTL_1_PULL_UP_EN | PON_CNTL_1_USB_PWR_EN;
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mask |= PON_CNTL_1_WD_EN_RESET;
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val = mask;
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if (!reset)
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val &= ~PON_CNTL_1_WD_EN_RESET;
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regmap_update_bits(pwrkey->regmap, PON_CNTL_1, mask, val);
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}
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/*
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* Set an SMPS regulator to be disabled in its CTRL register, but enabled
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* in the master enable register. Also set it's pull down enable bit.
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* Take care to make sure that the output voltage doesn't change if switching
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* from advanced mode to legacy mode.
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*/
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static int pm8058_disable_smps_locally_set_pull_down(struct regmap *regmap,
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u16 ctrl_addr, u16 test2_addr, u16 master_enable_addr,
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u8 master_enable_bit)
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{
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int error;
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u8 vref_sel, vlow_sel, band, vprog, bank;
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unsigned int reg;
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bank = PM8058_REGULATOR_BANK_SEL(7);
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error = regmap_write(regmap, test2_addr, bank);
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if (error)
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return error;
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error = regmap_read(regmap, test2_addr, ®);
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if (error)
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return error;
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reg &= PM8058_SMPS_ADVANCED_MODE_MASK;
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/* Check if in advanced mode. */
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if (reg == PM8058_SMPS_ADVANCED_MODE) {
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/* Determine current output voltage. */
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error = regmap_read(regmap, ctrl_addr, ®);
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if (error)
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return error;
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band = reg & PM8058_SMPS_ADVANCED_BAND_MASK;
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band >>= PM8058_SMPS_ADVANCED_BAND_SHIFT;
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switch (band) {
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case 3:
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vref_sel = 0;
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vlow_sel = 0;
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break;
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case 2:
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vref_sel = PM8058_SMPS_LEGACY_VREF_SEL;
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vlow_sel = 0;
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break;
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case 1:
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vref_sel = PM8058_SMPS_LEGACY_VREF_SEL;
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vlow_sel = PM8058_SMPS_LEGACY_VLOW_SEL;
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break;
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default:
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pr_err("%s: regulator already disabled\n", __func__);
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return -EPERM;
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}
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vprog = reg & PM8058_SMPS_ADVANCED_VPROG_MASK;
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/* Round up if fine step is in use. */
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vprog = (vprog + 1) >> 1;
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if (vprog > PM8058_SMPS_LEGACY_VPROG_MASK)
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vprog = PM8058_SMPS_LEGACY_VPROG_MASK;
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/* Set VLOW_SEL bit. */
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bank = PM8058_REGULATOR_BANK_SEL(1);
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error = regmap_write(regmap, test2_addr, bank);
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if (error)
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return error;
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error = regmap_update_bits(regmap, test2_addr,
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PM8058_REGULATOR_BANK_WRITE | PM8058_REGULATOR_BANK_MASK
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| PM8058_SMPS_LEGACY_VLOW_SEL,
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PM8058_REGULATOR_BANK_WRITE |
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PM8058_REGULATOR_BANK_SEL(1) | vlow_sel);
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if (error)
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return error;
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/* Switch to legacy mode */
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bank = PM8058_REGULATOR_BANK_SEL(7);
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error = regmap_write(regmap, test2_addr, bank);
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if (error)
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return error;
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error = regmap_update_bits(regmap, test2_addr,
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PM8058_REGULATOR_BANK_WRITE |
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PM8058_REGULATOR_BANK_MASK |
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PM8058_SMPS_ADVANCED_MODE_MASK,
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PM8058_REGULATOR_BANK_WRITE |
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PM8058_REGULATOR_BANK_SEL(7) |
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PM8058_SMPS_LEGACY_MODE);
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if (error)
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return error;
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/* Enable locally, enable pull down, keep voltage the same. */
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error = regmap_update_bits(regmap, ctrl_addr,
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PM8058_REGULATOR_ENABLE_MASK |
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PM8058_REGULATOR_PULL_DOWN_MASK |
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PM8058_SMPS_LEGACY_VREF_SEL |
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PM8058_SMPS_LEGACY_VPROG_MASK,
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PM8058_REGULATOR_ENABLE | PM8058_REGULATOR_PULL_DOWN_EN
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| vref_sel | vprog);
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if (error)
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return error;
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}
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/* Enable in master control register. */
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error = regmap_update_bits(regmap, master_enable_addr,
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master_enable_bit, master_enable_bit);
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if (error)
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return error;
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/* Disable locally and enable pull down. */
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return regmap_update_bits(regmap, ctrl_addr,
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PM8058_REGULATOR_ENABLE_MASK | PM8058_REGULATOR_PULL_DOWN_MASK,
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PM8058_REGULATOR_DISABLE | PM8058_REGULATOR_PULL_DOWN_EN);
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}
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static int pm8058_disable_ldo_locally_set_pull_down(struct regmap *regmap,
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u16 ctrl_addr, u16 master_enable_addr, u8 master_enable_bit)
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{
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int error;
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/* Enable LDO in master control register. */
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error = regmap_update_bits(regmap, master_enable_addr,
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master_enable_bit, master_enable_bit);
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if (error)
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return error;
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/* Disable LDO in CTRL register and set pull down */
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return regmap_update_bits(regmap, ctrl_addr,
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PM8058_REGULATOR_ENABLE_MASK | PM8058_REGULATOR_PULL_DOWN_MASK,
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PM8058_REGULATOR_DISABLE | PM8058_REGULATOR_PULL_DOWN_EN);
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}
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static int pm8058_pwrkey_shutdown(struct pmic8xxx_pwrkey *pwrkey, bool reset)
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{
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int error;
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struct regmap *regmap = pwrkey->regmap;
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u8 mask, val;
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/* When shutting down, enable active pulldowns on important rails. */
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if (!reset) {
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/* Disable SMPS's 0,1,3 locally and set pulldown enable bits. */
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pm8058_disable_smps_locally_set_pull_down(regmap,
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PM8058_S0_CTRL, PM8058_S0_TEST2,
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REG_PM8058_VREG_EN_MSM, BIT(7));
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pm8058_disable_smps_locally_set_pull_down(regmap,
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PM8058_S1_CTRL, PM8058_S1_TEST2,
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REG_PM8058_VREG_EN_MSM, BIT(6));
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pm8058_disable_smps_locally_set_pull_down(regmap,
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PM8058_S3_CTRL, PM8058_S3_TEST2,
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REG_PM8058_VREG_EN_GRP_5_4, BIT(7) | BIT(4));
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/* Disable LDO 21 locally and set pulldown enable bit. */
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pm8058_disable_ldo_locally_set_pull_down(regmap,
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PM8058_L21_CTRL, REG_PM8058_VREG_EN_GRP_5_4,
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BIT(1));
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}
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/*
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* Fix-up: Set regulator LDO22 to 1.225 V in high power mode. Leave its
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* pull-down state intact. This ensures a safe shutdown.
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*/
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error = regmap_update_bits(regmap, PM8058_L22_CTRL, 0xbf, 0x93);
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if (error)
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return error;
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/* Enable SMPL if resetting is desired */
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mask = SLEEP_CTRL_SMPL_EN_RESET;
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val = 0;
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if (reset)
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val = mask;
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return regmap_update_bits(regmap, PM8058_SLEEP_CTRL, mask, val);
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}
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static int pm8921_pwrkey_shutdown(struct pmic8xxx_pwrkey *pwrkey, bool reset)
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{
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struct regmap *regmap = pwrkey->regmap;
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u8 mask = SLEEP_CTRL_SMPL_EN_RESET;
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u8 val = 0;
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/* Enable SMPL if resetting is desired */
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if (reset)
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val = mask;
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return regmap_update_bits(regmap, PM8921_SLEEP_CTRL, mask, val);
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}
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static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
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{
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struct input_dev *pwr;
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int key_release_irq = platform_get_irq(pdev, 0);
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int key_press_irq = platform_get_irq(pdev, 1);
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int err;
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unsigned int delay;
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unsigned int pon_cntl;
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struct regmap *regmap;
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struct pmic8xxx_pwrkey *pwrkey;
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u32 kpd_delay;
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bool pull_up;
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if (of_property_read_u32(pdev->dev.of_node, "debounce", &kpd_delay))
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kpd_delay = 15625;
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/* Valid range of pwr key trigger delay is 1/64 sec to 2 seconds. */
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if (kpd_delay > USEC_PER_SEC * 2 || kpd_delay < USEC_PER_SEC / 64) {
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dev_err(&pdev->dev, "invalid power key trigger delay\n");
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return -EINVAL;
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}
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pull_up = of_property_read_bool(pdev->dev.of_node, "pull-up");
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regmap = dev_get_regmap(pdev->dev.parent, NULL);
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if (!regmap) {
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dev_err(&pdev->dev, "failed to locate regmap for the device\n");
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return -ENODEV;
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}
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pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL);
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if (!pwrkey)
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return -ENOMEM;
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pwrkey->shutdown_fn = of_device_get_match_data(&pdev->dev);
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pwrkey->regmap = regmap;
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pwrkey->key_press_irq = key_press_irq;
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pwr = devm_input_allocate_device(&pdev->dev);
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if (!pwr) {
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dev_dbg(&pdev->dev, "Can't allocate power button\n");
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return -ENOMEM;
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}
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input_set_capability(pwr, EV_KEY, KEY_POWER);
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pwr->name = "pmic8xxx_pwrkey";
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pwr->phys = "pmic8xxx_pwrkey/input0";
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delay = (kpd_delay << 6) / USEC_PER_SEC;
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delay = ilog2(delay);
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err = regmap_read(regmap, PON_CNTL_1, &pon_cntl);
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if (err < 0) {
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dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
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return err;
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}
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pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
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pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
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if (pull_up)
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pon_cntl |= PON_CNTL_PULL_UP;
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else
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pon_cntl &= ~PON_CNTL_PULL_UP;
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err = regmap_write(regmap, PON_CNTL_1, pon_cntl);
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if (err < 0) {
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dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
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return err;
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}
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err = devm_request_irq(&pdev->dev, key_press_irq, pwrkey_press_irq,
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IRQF_TRIGGER_RISING,
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"pmic8xxx_pwrkey_press", pwr);
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if (err) {
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dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
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key_press_irq, err);
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return err;
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}
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err = devm_request_irq(&pdev->dev, key_release_irq, pwrkey_release_irq,
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IRQF_TRIGGER_RISING,
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"pmic8xxx_pwrkey_release", pwr);
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if (err) {
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dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
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key_release_irq, err);
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return err;
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}
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err = input_register_device(pwr);
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if (err) {
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dev_err(&pdev->dev, "Can't register power key: %d\n", err);
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return err;
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}
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platform_set_drvdata(pdev, pwrkey);
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device_init_wakeup(&pdev->dev, 1);
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return 0;
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}
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static const struct of_device_id pm8xxx_pwr_key_id_table[] = {
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{ .compatible = "qcom,pm8058-pwrkey", .data = &pm8058_pwrkey_shutdown },
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{ .compatible = "qcom,pm8921-pwrkey", .data = &pm8921_pwrkey_shutdown },
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{ }
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};
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MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table);
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static struct platform_driver pmic8xxx_pwrkey_driver = {
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.probe = pmic8xxx_pwrkey_probe,
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.shutdown = pmic8xxx_pwrkey_shutdown,
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.driver = {
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.name = "pm8xxx-pwrkey",
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.pm = &pm8xxx_pwr_key_pm_ops,
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.of_match_table = pm8xxx_pwr_key_id_table,
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},
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};
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module_platform_driver(pmic8xxx_pwrkey_driver);
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MODULE_ALIAS("platform:pmic8xxx_pwrkey");
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MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");
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