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293 lines
7.1 KiB
293 lines
7.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* extcon driver for Basin Cove PMIC |
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* |
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* Copyright (c) 2019, Intel Corporation. |
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* Author: Andy Shevchenko <[email protected]> |
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*/ |
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#include <linux/extcon-provider.h> |
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#include <linux/interrupt.h> |
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#include <linux/mfd/intel_soc_pmic.h> |
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#include <linux/mfd/intel_soc_pmic_mrfld.h> |
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#include <linux/mod_devicetable.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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#include "extcon-intel.h" |
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#define BCOVE_USBIDCTRL 0x19 |
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#define BCOVE_USBIDCTRL_ID BIT(0) |
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#define BCOVE_USBIDCTRL_ACA BIT(1) |
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#define BCOVE_USBIDCTRL_ALL (BCOVE_USBIDCTRL_ID | BCOVE_USBIDCTRL_ACA) |
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#define BCOVE_USBIDSTS 0x1a |
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#define BCOVE_USBIDSTS_GND BIT(0) |
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#define BCOVE_USBIDSTS_RARBRC_MASK GENMASK(2, 1) |
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#define BCOVE_USBIDSTS_RARBRC_SHIFT 1 |
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#define BCOVE_USBIDSTS_NO_ACA 0 |
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#define BCOVE_USBIDSTS_R_ID_A 1 |
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#define BCOVE_USBIDSTS_R_ID_B 2 |
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#define BCOVE_USBIDSTS_R_ID_C 3 |
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#define BCOVE_USBIDSTS_FLOAT BIT(3) |
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#define BCOVE_USBIDSTS_SHORT BIT(4) |
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#define BCOVE_CHGRIRQ_ALL (BCOVE_CHGRIRQ_VBUSDET | BCOVE_CHGRIRQ_DCDET | \ |
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BCOVE_CHGRIRQ_BATTDET | BCOVE_CHGRIRQ_USBIDDET) |
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#define BCOVE_CHGRCTRL0 0x4b |
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#define BCOVE_CHGRCTRL0_CHGRRESET BIT(0) |
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#define BCOVE_CHGRCTRL0_EMRGCHREN BIT(1) |
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#define BCOVE_CHGRCTRL0_EXTCHRDIS BIT(2) |
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#define BCOVE_CHGRCTRL0_SWCONTROL BIT(3) |
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#define BCOVE_CHGRCTRL0_TTLCK BIT(4) |
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#define BCOVE_CHGRCTRL0_BIT_5 BIT(5) |
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#define BCOVE_CHGRCTRL0_BIT_6 BIT(6) |
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#define BCOVE_CHGRCTRL0_CHR_WDT_NOKICK BIT(7) |
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struct mrfld_extcon_data { |
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struct device *dev; |
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struct regmap *regmap; |
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struct extcon_dev *edev; |
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unsigned int status; |
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unsigned int id; |
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}; |
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static const unsigned int mrfld_extcon_cable[] = { |
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EXTCON_USB, |
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EXTCON_USB_HOST, |
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EXTCON_CHG_USB_SDP, |
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EXTCON_CHG_USB_CDP, |
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EXTCON_CHG_USB_DCP, |
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EXTCON_CHG_USB_ACA, |
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EXTCON_NONE, |
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}; |
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static int mrfld_extcon_clear(struct mrfld_extcon_data *data, unsigned int reg, |
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unsigned int mask) |
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{ |
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return regmap_update_bits(data->regmap, reg, mask, 0x00); |
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} |
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static int mrfld_extcon_set(struct mrfld_extcon_data *data, unsigned int reg, |
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unsigned int mask) |
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{ |
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return regmap_update_bits(data->regmap, reg, mask, 0xff); |
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} |
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static int mrfld_extcon_sw_control(struct mrfld_extcon_data *data, bool enable) |
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{ |
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unsigned int mask = BCOVE_CHGRCTRL0_SWCONTROL; |
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struct device *dev = data->dev; |
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int ret; |
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if (enable) |
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ret = mrfld_extcon_set(data, BCOVE_CHGRCTRL0, mask); |
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else |
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ret = mrfld_extcon_clear(data, BCOVE_CHGRCTRL0, mask); |
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if (ret) |
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dev_err(dev, "can't set SW control: %d\n", ret); |
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return ret; |
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} |
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static int mrfld_extcon_get_id(struct mrfld_extcon_data *data) |
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{ |
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struct regmap *regmap = data->regmap; |
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unsigned int id; |
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bool ground; |
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int ret; |
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ret = regmap_read(regmap, BCOVE_USBIDSTS, &id); |
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if (ret) |
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return ret; |
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if (id & BCOVE_USBIDSTS_FLOAT) |
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return INTEL_USB_ID_FLOAT; |
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switch ((id & BCOVE_USBIDSTS_RARBRC_MASK) >> BCOVE_USBIDSTS_RARBRC_SHIFT) { |
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case BCOVE_USBIDSTS_R_ID_A: |
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return INTEL_USB_RID_A; |
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case BCOVE_USBIDSTS_R_ID_B: |
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return INTEL_USB_RID_B; |
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case BCOVE_USBIDSTS_R_ID_C: |
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return INTEL_USB_RID_C; |
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} |
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/* |
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* PMIC A0 reports USBIDSTS_GND = 1 for ID_GND, |
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* but PMIC B0 reports USBIDSTS_GND = 0 for ID_GND. |
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* Thus we must check this bit at last. |
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*/ |
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ground = id & BCOVE_USBIDSTS_GND; |
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switch ('A' + BCOVE_MAJOR(data->id)) { |
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case 'A': |
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return ground ? INTEL_USB_ID_GND : INTEL_USB_ID_FLOAT; |
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case 'B': |
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return ground ? INTEL_USB_ID_FLOAT : INTEL_USB_ID_GND; |
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} |
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/* Unknown or unsupported type */ |
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return INTEL_USB_ID_FLOAT; |
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} |
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static int mrfld_extcon_role_detect(struct mrfld_extcon_data *data) |
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{ |
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unsigned int id; |
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bool usb_host; |
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int ret; |
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ret = mrfld_extcon_get_id(data); |
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if (ret < 0) |
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return ret; |
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id = ret; |
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usb_host = (id == INTEL_USB_ID_GND) || (id == INTEL_USB_RID_A); |
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extcon_set_state_sync(data->edev, EXTCON_USB_HOST, usb_host); |
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return 0; |
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} |
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static int mrfld_extcon_cable_detect(struct mrfld_extcon_data *data) |
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{ |
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struct regmap *regmap = data->regmap; |
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unsigned int status, change; |
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int ret; |
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/* |
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* It seems SCU firmware clears the content of BCOVE_CHGRIRQ1 |
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* and makes it useless for OS. Instead we compare a previously |
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* stored status to the current one, provided by BCOVE_SCHGRIRQ1. |
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*/ |
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ret = regmap_read(regmap, BCOVE_SCHGRIRQ1, &status); |
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if (ret) |
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return ret; |
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change = status ^ data->status; |
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if (!change) |
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return -ENODATA; |
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if (change & BCOVE_CHGRIRQ_USBIDDET) { |
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ret = mrfld_extcon_role_detect(data); |
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if (ret) |
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return ret; |
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} |
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data->status = status; |
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return 0; |
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} |
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static irqreturn_t mrfld_extcon_interrupt(int irq, void *dev_id) |
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{ |
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struct mrfld_extcon_data *data = dev_id; |
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int ret; |
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ret = mrfld_extcon_cable_detect(data); |
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mrfld_extcon_clear(data, BCOVE_MIRQLVL1, BCOVE_LVL1_CHGR); |
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return ret ? IRQ_NONE: IRQ_HANDLED; |
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} |
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static int mrfld_extcon_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent); |
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struct regmap *regmap = pmic->regmap; |
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struct mrfld_extcon_data *data; |
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unsigned int status; |
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unsigned int id; |
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int irq, ret; |
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irq = platform_get_irq(pdev, 0); |
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if (irq < 0) |
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return irq; |
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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data->dev = dev; |
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data->regmap = regmap; |
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data->edev = devm_extcon_dev_allocate(dev, mrfld_extcon_cable); |
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if (IS_ERR(data->edev)) |
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return -ENOMEM; |
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ret = devm_extcon_dev_register(dev, data->edev); |
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if (ret < 0) { |
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dev_err(dev, "can't register extcon device: %d\n", ret); |
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return ret; |
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} |
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ret = devm_request_threaded_irq(dev, irq, NULL, mrfld_extcon_interrupt, |
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IRQF_ONESHOT | IRQF_SHARED, pdev->name, |
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data); |
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if (ret) { |
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dev_err(dev, "can't register IRQ handler: %d\n", ret); |
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return ret; |
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} |
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ret = regmap_read(regmap, BCOVE_ID, &id); |
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if (ret) { |
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dev_err(dev, "can't read PMIC ID: %d\n", ret); |
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return ret; |
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} |
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data->id = id; |
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ret = mrfld_extcon_sw_control(data, true); |
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if (ret) |
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return ret; |
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/* Get initial state */ |
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mrfld_extcon_role_detect(data); |
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/* |
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* Cached status value is used for cable detection, see comments |
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* in mrfld_extcon_cable_detect(), we need to sync cached value |
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* with a real state of the hardware. |
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*/ |
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regmap_read(regmap, BCOVE_SCHGRIRQ1, &status); |
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data->status = status; |
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mrfld_extcon_clear(data, BCOVE_MIRQLVL1, BCOVE_LVL1_CHGR); |
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mrfld_extcon_clear(data, BCOVE_MCHGRIRQ1, BCOVE_CHGRIRQ_ALL); |
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mrfld_extcon_set(data, BCOVE_USBIDCTRL, BCOVE_USBIDCTRL_ALL); |
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platform_set_drvdata(pdev, data); |
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return 0; |
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} |
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static int mrfld_extcon_remove(struct platform_device *pdev) |
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{ |
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struct mrfld_extcon_data *data = platform_get_drvdata(pdev); |
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mrfld_extcon_sw_control(data, false); |
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return 0; |
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} |
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static const struct platform_device_id mrfld_extcon_id_table[] = { |
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{ .name = "mrfld_bcove_pwrsrc" }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(platform, mrfld_extcon_id_table); |
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static struct platform_driver mrfld_extcon_driver = { |
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.driver = { |
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.name = "mrfld_bcove_pwrsrc", |
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}, |
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.probe = mrfld_extcon_probe, |
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.remove = mrfld_extcon_remove, |
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.id_table = mrfld_extcon_id_table, |
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}; |
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module_platform_driver(mrfld_extcon_driver); |
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MODULE_AUTHOR("Andy Shevchenko <[email protected]>"); |
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MODULE_DESCRIPTION("extcon driver for Intel Merrifield Basin Cove PMIC"); |
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MODULE_LICENSE("GPL v2");
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