From patchwork Tue Jul 14 19:05:24 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Boyd X-Patchwork-Id: 6788481 Return-Path: X-Original-To: patchwork-linux-input@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id D1644C05AC for ; Tue, 14 Jul 2015 19:05:49 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 8F7752060C for ; Tue, 14 Jul 2015 19:05:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1C77020618 for ; Tue, 14 Jul 2015 19:05:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752844AbbGNTF3 (ORCPT ); Tue, 14 Jul 2015 15:05:29 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:38398 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752301AbbGNTF2 (ORCPT ); Tue, 14 Jul 2015 15:05:28 -0400 Received: from smtp.codeaurora.org (localhost [127.0.0.1]) by smtp.codeaurora.org (Postfix) with ESMTP id 3A015141358; Tue, 14 Jul 2015 19:05:27 +0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 486) id 28AF2141394; Tue, 14 Jul 2015 19:05:27 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-8.3 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from sboyd-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: sboyd@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id D8EE9141358; Tue, 14 Jul 2015 19:05:25 +0000 (UTC) From: Stephen Boyd To: Dmitry Torokhov Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-input@vger.kernel.org, Bjorn Andersson Subject: [PATCH v3] Input: pmic8xxx-pwrkey - Support shutdown Date: Tue, 14 Jul 2015 12:05:24 -0700 Message-Id: <1436900724-10994-1-git-send-email-sboyd@codeaurora.org> X-Mailer: git-send-email 2.3.0.rc1.33.g42e4583 X-Virus-Scanned: ClamAV using ClamSMTP Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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. Cc: Bjorn Andersson Signed-off-by: Stephen Boyd Reviewed-by: Bjorn Andersson --- Changes since v2: * s/ret/error/ * Use of_device_get_match_data() and don't move match table * Fix whitespace errors drivers/input/misc/pmic8xxx-pwrkey.c | 268 ++++++++++++++++++++++++++++++++++- 1 file changed, 266 insertions(+), 2 deletions(-) diff --git a/drivers/input/misc/pmic8xxx-pwrkey.c b/drivers/input/misc/pmic8xxx-pwrkey.c index c4ca20e63221..3f02e0e03d12 100644 --- a/drivers/input/misc/pmic8xxx-pwrkey.c +++ b/drivers/input/misc/pmic8xxx-pwrkey.c @@ -20,17 +20,72 @@ #include #include #include +#include #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, ®); + 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; @@ -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,