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262 lines
6.8 KiB
262 lines
6.8 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Poweroff & reset driver for Actions Semi ATC260x PMICs |
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* |
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* Copyright (c) 2020 Cristian Ciocaltea <[email protected]> |
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*/ |
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#include <linux/delay.h> |
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#include <linux/mfd/atc260x/core.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/power_supply.h> |
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#include <linux/reboot.h> |
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#include <linux/regmap.h> |
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struct atc260x_pwrc { |
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struct device *dev; |
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struct regmap *regmap; |
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struct notifier_block restart_nb; |
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int (*do_poweroff)(const struct atc260x_pwrc *pwrc, bool restart); |
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}; |
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/* Global variable needed only for pm_power_off */ |
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static struct atc260x_pwrc *atc260x_pwrc_data; |
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static int atc2603c_do_poweroff(const struct atc260x_pwrc *pwrc, bool restart) |
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{ |
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int ret, deep_sleep = 0; |
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uint reg_mask, reg_val; |
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/* S4-Deep Sleep Mode is NOT available for WALL/USB power */ |
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if (!restart && !power_supply_is_system_supplied()) { |
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deep_sleep = 1; |
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dev_info(pwrc->dev, "Enabling S4-Deep Sleep Mode"); |
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} |
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/* Update wakeup sources */ |
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reg_val = ATC2603C_PMU_SYS_CTL0_ONOFF_LONG_WK_EN | |
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(restart ? ATC2603C_PMU_SYS_CTL0_RESET_WK_EN |
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: ATC2603C_PMU_SYS_CTL0_ONOFF_SHORT_WK_EN); |
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ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL0, |
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ATC2603C_PMU_SYS_CTL0_WK_ALL, reg_val); |
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if (ret) |
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dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret); |
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/* Update power mode */ |
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reg_mask = ATC2603C_PMU_SYS_CTL3_EN_S2 | ATC2603C_PMU_SYS_CTL3_EN_S3; |
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ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL3, reg_mask, |
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deep_sleep ? 0 : ATC2603C_PMU_SYS_CTL3_EN_S3); |
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if (ret) { |
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dev_err(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret); |
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return ret; |
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} |
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/* Trigger poweroff / restart sequence */ |
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reg_mask = restart ? ATC2603C_PMU_SYS_CTL0_RESTART_EN |
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: ATC2603C_PMU_SYS_CTL1_EN_S1; |
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reg_val = restart ? ATC2603C_PMU_SYS_CTL0_RESTART_EN : 0; |
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ret = regmap_update_bits(pwrc->regmap, |
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restart ? ATC2603C_PMU_SYS_CTL0 : ATC2603C_PMU_SYS_CTL1, |
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reg_mask, reg_val); |
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if (ret) { |
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dev_err(pwrc->dev, "failed to write SYS_CTL%d: %d\n", |
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restart ? 0 : 1, ret); |
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return ret; |
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} |
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/* Wait for trigger completion */ |
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mdelay(200); |
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return 0; |
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} |
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static int atc2609a_do_poweroff(const struct atc260x_pwrc *pwrc, bool restart) |
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{ |
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int ret, deep_sleep = 0; |
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uint reg_mask, reg_val; |
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/* S4-Deep Sleep Mode is NOT available for WALL/USB power */ |
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if (!restart && !power_supply_is_system_supplied()) { |
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deep_sleep = 1; |
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dev_info(pwrc->dev, "Enabling S4-Deep Sleep Mode"); |
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} |
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/* Update wakeup sources */ |
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reg_val = ATC2609A_PMU_SYS_CTL0_ONOFF_LONG_WK_EN | |
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(restart ? ATC2609A_PMU_SYS_CTL0_RESET_WK_EN |
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: ATC2609A_PMU_SYS_CTL0_ONOFF_SHORT_WK_EN); |
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ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL0, |
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ATC2609A_PMU_SYS_CTL0_WK_ALL, reg_val); |
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if (ret) |
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dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret); |
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/* Update power mode */ |
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reg_mask = ATC2609A_PMU_SYS_CTL3_EN_S2 | ATC2609A_PMU_SYS_CTL3_EN_S3; |
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ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL3, reg_mask, |
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deep_sleep ? 0 : ATC2609A_PMU_SYS_CTL3_EN_S3); |
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if (ret) { |
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dev_err(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret); |
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return ret; |
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} |
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/* Trigger poweroff / restart sequence */ |
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reg_mask = restart ? ATC2609A_PMU_SYS_CTL0_RESTART_EN |
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: ATC2609A_PMU_SYS_CTL1_EN_S1; |
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reg_val = restart ? ATC2609A_PMU_SYS_CTL0_RESTART_EN : 0; |
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ret = regmap_update_bits(pwrc->regmap, |
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restart ? ATC2609A_PMU_SYS_CTL0 : ATC2609A_PMU_SYS_CTL1, |
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reg_mask, reg_val); |
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if (ret) { |
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dev_err(pwrc->dev, "failed to write SYS_CTL%d: %d\n", |
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restart ? 0 : 1, ret); |
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return ret; |
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} |
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/* Wait for trigger completion */ |
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mdelay(200); |
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return 0; |
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} |
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static int atc2603c_init(const struct atc260x_pwrc *pwrc) |
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{ |
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int ret; |
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/* |
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* Delay transition from S2/S3 to S1 in order to avoid |
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* DDR init failure in Bootloader. |
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*/ |
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ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL3, |
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ATC2603C_PMU_SYS_CTL3_S2S3TOS1_TIMER_EN, |
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ATC2603C_PMU_SYS_CTL3_S2S3TOS1_TIMER_EN); |
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if (ret) |
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dev_warn(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret); |
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/* Set wakeup sources */ |
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ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL0, |
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ATC2603C_PMU_SYS_CTL0_WK_ALL, |
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ATC2603C_PMU_SYS_CTL0_HDSW_WK_EN | |
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ATC2603C_PMU_SYS_CTL0_ONOFF_LONG_WK_EN); |
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if (ret) |
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dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret); |
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return ret; |
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} |
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static int atc2609a_init(const struct atc260x_pwrc *pwrc) |
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{ |
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int ret; |
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/* Set wakeup sources */ |
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ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL0, |
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ATC2609A_PMU_SYS_CTL0_WK_ALL, |
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ATC2609A_PMU_SYS_CTL0_HDSW_WK_EN | |
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ATC2609A_PMU_SYS_CTL0_ONOFF_LONG_WK_EN); |
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if (ret) |
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dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret); |
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return ret; |
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} |
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static void atc260x_pwrc_pm_handler(void) |
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{ |
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atc260x_pwrc_data->do_poweroff(atc260x_pwrc_data, false); |
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WARN_ONCE(1, "Unable to power off system\n"); |
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} |
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static int atc260x_pwrc_restart_handler(struct notifier_block *nb, |
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unsigned long mode, void *cmd) |
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{ |
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struct atc260x_pwrc *pwrc = container_of(nb, struct atc260x_pwrc, |
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restart_nb); |
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pwrc->do_poweroff(pwrc, true); |
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return NOTIFY_DONE; |
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} |
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static int atc260x_pwrc_probe(struct platform_device *pdev) |
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{ |
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struct atc260x *atc260x = dev_get_drvdata(pdev->dev.parent); |
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struct atc260x_pwrc *priv; |
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int ret; |
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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priv->dev = &pdev->dev; |
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priv->regmap = atc260x->regmap; |
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priv->restart_nb.notifier_call = atc260x_pwrc_restart_handler; |
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priv->restart_nb.priority = 192; |
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switch (atc260x->ic_type) { |
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case ATC2603C: |
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priv->do_poweroff = atc2603c_do_poweroff; |
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ret = atc2603c_init(priv); |
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break; |
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case ATC2609A: |
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priv->do_poweroff = atc2609a_do_poweroff; |
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ret = atc2609a_init(priv); |
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break; |
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default: |
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dev_err(priv->dev, |
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"Poweroff not supported for ATC260x PMIC type: %u\n", |
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atc260x->ic_type); |
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return -EINVAL; |
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} |
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if (ret) |
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return ret; |
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platform_set_drvdata(pdev, priv); |
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if (!pm_power_off) { |
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atc260x_pwrc_data = priv; |
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pm_power_off = atc260x_pwrc_pm_handler; |
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} else { |
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dev_warn(priv->dev, "Poweroff callback already assigned\n"); |
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} |
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ret = register_restart_handler(&priv->restart_nb); |
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if (ret) |
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dev_err(priv->dev, "failed to register restart handler: %d\n", |
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ret); |
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return ret; |
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} |
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static int atc260x_pwrc_remove(struct platform_device *pdev) |
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{ |
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struct atc260x_pwrc *priv = platform_get_drvdata(pdev); |
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if (atc260x_pwrc_data == priv) { |
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pm_power_off = NULL; |
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atc260x_pwrc_data = NULL; |
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} |
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unregister_restart_handler(&priv->restart_nb); |
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return 0; |
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} |
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static struct platform_driver atc260x_pwrc_driver = { |
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.probe = atc260x_pwrc_probe, |
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.remove = atc260x_pwrc_remove, |
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.driver = { |
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.name = "atc260x-pwrc", |
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}, |
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}; |
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module_platform_driver(atc260x_pwrc_driver); |
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MODULE_DESCRIPTION("Poweroff & reset driver for ATC260x PMICs"); |
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MODULE_AUTHOR("Cristian Ciocaltea <[email protected]>"); |
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MODULE_LICENSE("GPL");
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