extcon: axp288: Add axp288 extcon driver support
This patch adds the extcon support for AXP288 PMIC which has the BC1.2 charger detection capability. Additionally it also adds the USB mux switching support b/w SOC and PMIC based on GPIO control. Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com> Acked-by: Lee Jones <lee.jones@linaro.org> [cw00.choi: Modify the log message to keep the consistent log message pattern] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Ramakrishna Pallala
Chanwoo Choi
Родитель
d0fd5fbc09
Коммит
f03123783d
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@ -28,6 +28,13 @@ config EXTCON_ARIZONA
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with Wolfson Arizona devices. These are audio CODECs with
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advanced audio accessory detection support.
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config EXTCON_AXP288
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tristate "X-Power AXP288 EXTCON support"
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depends on MFD_AXP20X && USB_PHY
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help
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Say Y here to enable support for USB peripheral detection
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and USB MUX switching by X-Power AXP288 PMIC.
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config EXTCON_GPIO
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tristate "GPIO extcon support"
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depends on GPIOLIB
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@ -5,6 +5,7 @@
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obj-$(CONFIG_EXTCON) += extcon.o
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obj-$(CONFIG_EXTCON_ADC_JACK) += extcon-adc-jack.o
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obj-$(CONFIG_EXTCON_ARIZONA) += extcon-arizona.o
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obj-$(CONFIG_EXTCON_AXP288) += extcon-axp288.o
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obj-$(CONFIG_EXTCON_GPIO) += extcon-gpio.o
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obj-$(CONFIG_EXTCON_MAX14577) += extcon-max14577.o
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obj-$(CONFIG_EXTCON_MAX77693) += extcon-max77693.o
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@ -0,0 +1,385 @@
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/*
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* extcon-axp288.c - X-Power AXP288 PMIC extcon cable detection driver
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*
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* Copyright (C) 2015 Intel Corporation
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* Author: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
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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 as
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* 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/io.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/usb/phy.h>
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#include <linux/notifier.h>
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#include <linux/extcon.h>
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#include <linux/regmap.h>
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#include <linux/gpio.h>
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#include <linux/gpio/consumer.h>
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#include <linux/mfd/axp20x.h>
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/* Power source status register */
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#define PS_STAT_VBUS_TRIGGER BIT(0)
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#define PS_STAT_BAT_CHRG_DIR BIT(2)
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#define PS_STAT_VBUS_ABOVE_VHOLD BIT(3)
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#define PS_STAT_VBUS_VALID BIT(4)
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#define PS_STAT_VBUS_PRESENT BIT(5)
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/* BC module global register */
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#define BC_GLOBAL_RUN BIT(0)
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#define BC_GLOBAL_DET_STAT BIT(2)
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#define BC_GLOBAL_DBP_TOUT BIT(3)
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#define BC_GLOBAL_VLGC_COM_SEL BIT(4)
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#define BC_GLOBAL_DCD_TOUT_MASK (BIT(6)|BIT(5))
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#define BC_GLOBAL_DCD_TOUT_300MS 0
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#define BC_GLOBAL_DCD_TOUT_100MS 1
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#define BC_GLOBAL_DCD_TOUT_500MS 2
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#define BC_GLOBAL_DCD_TOUT_900MS 3
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#define BC_GLOBAL_DCD_DET_SEL BIT(7)
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/* BC module vbus control and status register */
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#define VBUS_CNTL_DPDM_PD_EN BIT(4)
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#define VBUS_CNTL_DPDM_FD_EN BIT(5)
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#define VBUS_CNTL_FIRST_PO_STAT BIT(6)
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/* BC USB status register */
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#define USB_STAT_BUS_STAT_MASK (BIT(3)|BIT(2)|BIT(1)|BIT(0))
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#define USB_STAT_BUS_STAT_SHIFT 0
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#define USB_STAT_BUS_STAT_ATHD 0
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#define USB_STAT_BUS_STAT_CONN 1
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#define USB_STAT_BUS_STAT_SUSP 2
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#define USB_STAT_BUS_STAT_CONF 3
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#define USB_STAT_USB_SS_MODE BIT(4)
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#define USB_STAT_DEAD_BAT_DET BIT(6)
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#define USB_STAT_DBP_UNCFG BIT(7)
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/* BC detect status register */
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#define DET_STAT_MASK (BIT(7)|BIT(6)|BIT(5))
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#define DET_STAT_SHIFT 5
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#define DET_STAT_SDP 1
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#define DET_STAT_CDP 2
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#define DET_STAT_DCP 3
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/* IRQ enable-1 register */
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#define PWRSRC_IRQ_CFG_MASK (BIT(4)|BIT(3)|BIT(2))
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/* IRQ enable-6 register */
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#define BC12_IRQ_CFG_MASK BIT(1)
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#define AXP288_EXTCON_SLOW_CHARGER "SLOW-CHARGER"
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#define AXP288_EXTCON_DOWNSTREAM_CHARGER "CHARGE-DOWNSTREAM"
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#define AXP288_EXTCON_FAST_CHARGER "FAST-CHARGER"
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enum axp288_extcon_reg {
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AXP288_PS_STAT_REG = 0x00,
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AXP288_PS_BOOT_REASON_REG = 0x02,
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AXP288_BC_GLOBAL_REG = 0x2c,
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AXP288_BC_VBUS_CNTL_REG = 0x2d,
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AXP288_BC_USB_STAT_REG = 0x2e,
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AXP288_BC_DET_STAT_REG = 0x2f,
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AXP288_PWRSRC_IRQ_CFG_REG = 0x40,
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AXP288_BC12_IRQ_CFG_REG = 0x45,
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};
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enum axp288_mux_select {
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EXTCON_GPIO_MUX_SEL_PMIC = 0,
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EXTCON_GPIO_MUX_SEL_SOC,
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};
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enum axp288_extcon_irq {
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VBUS_FALLING_IRQ = 0,
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VBUS_RISING_IRQ,
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MV_CHNG_IRQ,
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BC_USB_CHNG_IRQ,
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EXTCON_IRQ_END,
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};
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static const char *axp288_extcon_cables[] = {
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AXP288_EXTCON_SLOW_CHARGER,
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AXP288_EXTCON_DOWNSTREAM_CHARGER,
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AXP288_EXTCON_FAST_CHARGER,
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NULL,
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};
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struct axp288_extcon_info {
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struct device *dev;
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struct regmap *regmap;
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struct regmap_irq_chip_data *regmap_irqc;
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struct axp288_extcon_pdata *pdata;
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int irq[EXTCON_IRQ_END];
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struct extcon_dev *edev;
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struct notifier_block extcon_nb;
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struct usb_phy *otg;
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};
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/* Power up/down reason string array */
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static char *axp288_pwr_up_down_info[] = {
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"Last wake caused by user pressing the power button",
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"Last wake caused by a charger insertion",
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"Last wake caused by a battery insertion",
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"Last wake caused by SOC initiated global reset",
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"Last wake caused by cold reset",
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"Last shutdown caused by PMIC UVLO threshold",
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"Last shutdown caused by SOC initiated cold off",
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"Last shutdown caused by user pressing the power button",
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NULL,
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};
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/*
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* Decode and log the given "reset source indicator" (rsi)
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* register and then clear it.
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*/
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static void axp288_extcon_log_rsi(struct axp288_extcon_info *info)
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{
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char **rsi;
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unsigned int val, i, clear_mask = 0;
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int ret;
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ret = regmap_read(info->regmap, AXP288_PS_BOOT_REASON_REG, &val);
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for (i = 0, rsi = axp288_pwr_up_down_info; *rsi; rsi++, i++) {
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if (val & BIT(i)) {
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dev_dbg(info->dev, "%s\n", *rsi);
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clear_mask |= BIT(i);
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}
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}
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/* Clear the register value for next reboot (write 1 to clear bit) */
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regmap_write(info->regmap, AXP288_PS_BOOT_REASON_REG, clear_mask);
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}
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static int axp288_handle_chrg_det_event(struct axp288_extcon_info *info)
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{
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static bool notify_otg, notify_charger;
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static char *cable;
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int ret, stat, cfg, pwr_stat;
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u8 chrg_type;
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bool vbus_attach = false;
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ret = regmap_read(info->regmap, AXP288_PS_STAT_REG, &pwr_stat);
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if (ret < 0) {
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dev_err(info->dev, "failed to read vbus status\n");
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return ret;
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}
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vbus_attach = (pwr_stat & PS_STAT_VBUS_PRESENT);
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if (!vbus_attach)
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goto notify_otg;
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/* Check charger detection completion status */
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ret = regmap_read(info->regmap, AXP288_BC_GLOBAL_REG, &cfg);
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if (ret < 0)
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goto dev_det_ret;
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if (cfg & BC_GLOBAL_DET_STAT) {
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dev_dbg(info->dev, "can't complete the charger detection\n");
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goto dev_det_ret;
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}
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ret = regmap_read(info->regmap, AXP288_BC_DET_STAT_REG, &stat);
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if (ret < 0)
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goto dev_det_ret;
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chrg_type = (stat & DET_STAT_MASK) >> DET_STAT_SHIFT;
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switch (chrg_type) {
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case DET_STAT_SDP:
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dev_dbg(info->dev, "sdp cable is connecetd\n");
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notify_otg = true;
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notify_charger = true;
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cable = AXP288_EXTCON_SLOW_CHARGER;
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break;
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case DET_STAT_CDP:
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dev_dbg(info->dev, "cdp cable is connecetd\n");
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notify_otg = true;
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notify_charger = true;
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cable = AXP288_EXTCON_DOWNSTREAM_CHARGER;
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break;
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case DET_STAT_DCP:
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dev_dbg(info->dev, "dcp cable is connecetd\n");
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notify_charger = true;
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cable = AXP288_EXTCON_FAST_CHARGER;
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break;
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default:
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dev_warn(info->dev,
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"disconnect or unknown or ID event\n");
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}
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notify_otg:
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if (notify_otg) {
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/*
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* If VBUS is absent Connect D+/D- lines to PMIC for BC
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* detection. Else connect them to SOC for USB communication.
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*/
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if (info->pdata->gpio_mux_cntl)
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gpiod_set_value(info->pdata->gpio_mux_cntl,
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vbus_attach ? EXTCON_GPIO_MUX_SEL_SOC
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: EXTCON_GPIO_MUX_SEL_PMIC);
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atomic_notifier_call_chain(&info->otg->notifier,
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vbus_attach ? USB_EVENT_VBUS : USB_EVENT_NONE, NULL);
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}
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if (notify_charger)
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extcon_set_cable_state(info->edev, cable, vbus_attach);
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/* Clear the flags on disconnect event */
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if (!vbus_attach)
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notify_otg = notify_charger = false;
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return 0;
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dev_det_ret:
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if (ret < 0)
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dev_err(info->dev, "failed to detect BC Mod\n");
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return ret;
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}
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static irqreturn_t axp288_extcon_isr(int irq, void *data)
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{
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struct axp288_extcon_info *info = data;
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int ret;
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ret = axp288_handle_chrg_det_event(info);
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if (ret < 0)
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dev_err(info->dev, "failed to handle the interrupt\n");
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return IRQ_HANDLED;
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}
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static void axp288_extcon_enable_irq(struct axp288_extcon_info *info)
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{
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/* Unmask VBUS interrupt */
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regmap_write(info->regmap, AXP288_PWRSRC_IRQ_CFG_REG,
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PWRSRC_IRQ_CFG_MASK);
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regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
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BC_GLOBAL_RUN, 0);
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/* Unmask the BC1.2 complete interrupts */
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regmap_write(info->regmap, AXP288_BC12_IRQ_CFG_REG, BC12_IRQ_CFG_MASK);
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/* Enable the charger detection logic */
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regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
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BC_GLOBAL_RUN, BC_GLOBAL_RUN);
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}
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static int axp288_extcon_probe(struct platform_device *pdev)
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{
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struct axp288_extcon_info *info;
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struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
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int ret, i, pirq, gpio;
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info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->dev = &pdev->dev;
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info->regmap = axp20x->regmap;
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info->regmap_irqc = axp20x->regmap_irqc;
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info->pdata = pdev->dev.platform_data;
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if (!info->pdata) {
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/* Try ACPI provided pdata via device properties */
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if (!device_property_present(&pdev->dev,
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"axp288_extcon_data\n"))
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dev_err(&pdev->dev, "failed to get platform data\n");
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return -ENODEV;
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}
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platform_set_drvdata(pdev, info);
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axp288_extcon_log_rsi(info);
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/* Initialize extcon device */
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info->edev = devm_extcon_dev_allocate(&pdev->dev,
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axp288_extcon_cables);
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if (IS_ERR(info->edev)) {
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dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
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return PTR_ERR(info->edev);
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}
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/* Register extcon device */
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ret = devm_extcon_dev_register(&pdev->dev, info->edev);
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if (ret) {
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dev_err(&pdev->dev, "failed to register extcon device\n");
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return ret;
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}
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/* Get otg transceiver phy */
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info->otg = usb_get_phy(USB_PHY_TYPE_USB2);
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if (IS_ERR(info->otg)) {
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dev_err(&pdev->dev, "failed to get otg transceiver\n");
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return PTR_ERR(info->otg);
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}
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/* Set up gpio control for USB Mux */
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if (info->pdata->gpio_mux_cntl) {
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gpio = desc_to_gpio(info->pdata->gpio_mux_cntl);
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ret = gpio_request(gpio, "USB_MUX");
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if (ret < 0) {
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dev_err(&pdev->dev,
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"failed to request the gpio=%d\n", gpio);
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goto gpio_req_failed;
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}
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gpiod_direction_output(info->pdata->gpio_mux_cntl,
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EXTCON_GPIO_MUX_SEL_PMIC);
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}
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for (i = 0; i < EXTCON_IRQ_END; i++) {
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pirq = platform_get_irq(pdev, i);
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info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
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if (info->irq[i] < 0) {
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dev_err(&pdev->dev,
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"failed to get virtual interrupt=%d\n", pirq);
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ret = info->irq[i];
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goto gpio_req_failed;
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}
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ret = devm_request_threaded_irq(&pdev->dev, info->irq[i],
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NULL, axp288_extcon_isr,
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IRQF_ONESHOT | IRQF_NO_SUSPEND,
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pdev->name, info);
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if (ret) {
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dev_err(&pdev->dev, "failed to request interrupt=%d\n",
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info->irq[i]);
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goto gpio_req_failed;
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}
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}
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/* Enable interrupts */
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axp288_extcon_enable_irq(info);
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return 0;
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gpio_req_failed:
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usb_put_phy(info->otg);
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return ret;
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}
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static int axp288_extcon_remove(struct platform_device *pdev)
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{
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struct axp288_extcon_info *info = platform_get_drvdata(pdev);
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usb_put_phy(info->otg);
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return 0;
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}
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static struct platform_driver axp288_extcon_driver = {
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.probe = axp288_extcon_probe,
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.remove = axp288_extcon_remove,
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.driver = {
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.name = "axp288_extcon",
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},
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};
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module_platform_driver(axp288_extcon_driver);
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MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
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MODULE_DESCRIPTION("X-Powers AXP288 extcon driver");
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MODULE_LICENSE("GPL v2");
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@ -275,4 +275,9 @@ struct axp20x_fg_pdata {
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int thermistor_curve[MAX_THERM_CURVE_SIZE][2];
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};
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struct axp288_extcon_pdata {
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/* GPIO pin control to switch D+/D- lines b/w PMIC and SOC */
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struct gpio_desc *gpio_mux_cntl;
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};
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#endif /* __LINUX_MFD_AXP20X_H */
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