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- /* Copyright (c) 2010,2011 The Linux Foundation. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 and
- * only version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- */
- /*
- * Qualcomm PMIC8XXX NFC driver
- *
- */
- #include <linux/module.h>
- #include <linux/platform_device.h>
- #include <linux/err.h>
- #include <linux/debugfs.h>
- #include <linux/slab.h>
- #include <linux/mfd/pm8xxx/core.h>
- #include <linux/mfd/pm8xxx/nfc.h>
- /* PM8XXX NFC */
- #define SSBI_REG_NFC_CTRL 0x14D
- #define SSBI_REG_NFC_TEST 0x14E
- /* NFC_CTRL */
- #define PM8XXX_NFC_SUPPORT_EN 0x80
- #define PM8XXX_NFC_LDO_EN 0x40
- #define PM8XXX_NFC_EN 0x20
- #define PM8XXX_NFC_EXT_VDDLDO_EN 0x10
- #define PM8XXX_NFC_VPH_PWR_EN 0x08
- #define PM8XXX_NFC_RESERVED 0x04
- #define PM8XXX_NFC_VDDLDO_LEVEL 0x03
- /* NFC_TEST */
- #define PM8XXX_NFC_VDDLDO_MON_EN 0x80
- #define PM8XXX_NFC_ATEST_EN 0x40
- #define PM8XXX_NFC_DTEST1_EN 0x20
- #define PM8XXX_NFC_RESERVED2 0x18
- #define PM8XXX_NFC_VDDLDO_OK_S 0x04
- #define PM8XXX_NFC_MBG_EN_S 0x02
- #define PM8XXX_NFC_EXT_EN_S 0x01
- struct pm8xxx_nfc_device {
- struct device *dev;
- struct mutex nfc_mutex;
- #if defined(CONFIG_DEBUG_FS)
- struct dentry *dent;
- #endif
- };
- static struct pm8xxx_nfc_device *nfc_dev;
- /* APIs */
- /*
- * pm8xxx_nfc_request - request a handle to access NFC device
- */
- struct pm8xxx_nfc_device *pm8xxx_nfc_request(void)
- {
- return nfc_dev;
- }
- EXPORT_SYMBOL(pm8xxx_nfc_request);
- /*
- * pm8xxx_nfc_config - configure NFC signals
- *
- * @nfcdev: the NFC device
- * @mask: signal mask to configure
- * @flags: control flags
- */
- int pm8xxx_nfc_config(struct pm8xxx_nfc_device *nfcdev, u32 mask, u32 flags)
- {
- u8 nfc_ctrl, nfc_test, m, f;
- int rc;
- if (nfcdev == NULL || IS_ERR(nfcdev) || !mask)
- return -EINVAL;
- mutex_lock(&nfcdev->nfc_mutex);
- if (!(mask & PM_NFC_CTRL_REQ))
- goto config_test;
- rc = pm8xxx_readb(nfcdev->dev->parent, SSBI_REG_NFC_CTRL, &nfc_ctrl);
- if (rc) {
- pr_err("%s: FAIL pm8xxx_readb(): rc=%d (nfc_ctrl=0x%x)\n",
- __func__, rc, nfc_ctrl);
- goto config_done;
- }
- m = mask & 0x00ff;
- f = flags & 0x00ff;
- nfc_ctrl &= ~m;
- nfc_ctrl |= m & f;
- rc = pm8xxx_writeb(nfcdev->dev->parent, SSBI_REG_NFC_CTRL, nfc_ctrl);
- if (rc) {
- pr_err("%s: FAIL pm8xxx_writeb(): rc=%d (nfc_ctrl=0x%x)\n",
- __func__, rc, nfc_ctrl);
- goto config_done;
- }
- config_test:
- if (!(mask & PM_NFC_TEST_REQ))
- goto config_done;
- rc = pm8xxx_readb(nfcdev->dev->parent, SSBI_REG_NFC_TEST, &nfc_test);
- if (rc) {
- pr_err("%s: FAIL pm8xxx_readb(): rc=%d (nfc_test=0x%x)\n",
- __func__, rc, nfc_test);
- goto config_done;
- }
- m = (mask >> 8) & 0x00ff;
- f = (flags >> 8) & 0x00ff;
- nfc_test &= ~m;
- nfc_test |= m & f;
- rc = pm8xxx_writeb(nfcdev->dev->parent, SSBI_REG_NFC_TEST, nfc_test);
- if (rc) {
- pr_err("%s: FAIL pm8xxx_writeb(): rc=%d (nfc_test=0x%x)\n",
- __func__, rc, nfc_test);
- goto config_done;
- }
- config_done:
- mutex_unlock(&nfcdev->nfc_mutex);
- return 0;
- }
- EXPORT_SYMBOL(pm8xxx_nfc_config);
- /*
- * pm8xxx_nfc_get_status - get NFC status
- *
- * @nfcdev: the NFC device
- * @mask: of status mask to read
- * @status: pointer to the status variable
- */
- int pm8xxx_nfc_get_status(struct pm8xxx_nfc_device *nfcdev,
- u32 mask, u32 *status)
- {
- u8 nfc_ctrl, nfc_test;
- u32 st;
- int rc;
- if (nfcdev == NULL || IS_ERR(nfcdev) || status == NULL)
- return -EINVAL;
- st = 0;
- mutex_lock(&nfcdev->nfc_mutex);
- if (!(mask & PM_NFC_CTRL_REQ))
- goto read_test;
- rc = pm8xxx_readb(nfcdev->dev->parent, SSBI_REG_NFC_CTRL, &nfc_ctrl);
- if (rc) {
- pr_err("%s: FAIL pm8xxx_readb(): rc=%d (nfc_ctrl=0x%x)\n",
- __func__, rc, nfc_ctrl);
- goto get_status_done;
- }
- read_test:
- if (!(mask & (PM_NFC_TEST_REQ | PM_NFC_TEST_STATUS)))
- goto get_status_done;
- rc = pm8xxx_readb(nfcdev->dev->parent, SSBI_REG_NFC_TEST, &nfc_test);
- if (rc)
- pr_err("%s: FAIL pm8xxx_readb(): rc=%d (nfc_test=0x%x)\n",
- __func__, rc, nfc_test);
- get_status_done:
- st = nfc_ctrl;
- st |= nfc_test << 8;
- *status = st;
- mutex_unlock(&nfcdev->nfc_mutex);
- return 0;
- }
- EXPORT_SYMBOL(pm8xxx_nfc_get_status);
- /*
- * pm8xxx_nfc_free - free the NFC device
- */
- void pm8xxx_nfc_free(struct pm8xxx_nfc_device *nfcdev)
- {
- /* Disable all signals */
- pm8xxx_nfc_config(nfcdev, PM_NFC_CTRL_REQ, 0);
- }
- EXPORT_SYMBOL(pm8xxx_nfc_free);
- #if defined(CONFIG_DEBUG_FS)
- static int pm8xxx_nfc_debug_set(void *data, u64 val)
- {
- struct pm8xxx_nfc_device *nfcdev;
- u32 mask, control;
- int rc;
- nfcdev = (struct pm8xxx_nfc_device *)data;
- control = (u32)val & 0xffff;
- mask = ((u32)val >> 16) & 0xffff;
- rc = pm8xxx_nfc_config(nfcdev, mask, control);
- if (rc)
- pr_err("%s: ERR pm8xxx_nfc_config: rc=%d, "
- "[mask, control]=[0x%x, 0x%x]\n",
- __func__, rc, mask, control);
- return 0;
- }
- static int pm8xxx_nfc_debug_get(void *data, u64 *val)
- {
- struct pm8xxx_nfc_device *nfcdev;
- u32 status;
- int rc;
- nfcdev = (struct pm8xxx_nfc_device *)data;
- rc = pm8xxx_nfc_get_status(nfcdev, (u32)-1, &status);
- if (rc)
- pr_err("%s: ERR pm8xxx_nfc_get_status: rc=%d, status=0x%x\n",
- __func__, rc, status);
- if (val)
- *val = (u64)status;
- return 0;
- }
- DEFINE_SIMPLE_ATTRIBUTE(pm8xxx_nfc_fops, pm8xxx_nfc_debug_get,
- pm8xxx_nfc_debug_set, "%llu\n");
- static int pm8xxx_nfc_debug_init(struct pm8xxx_nfc_device *nfcdev)
- {
- struct dentry *dent;
- dent = debugfs_create_file("pm8xxx-nfc", 0644, NULL,
- (void *)nfcdev, &pm8xxx_nfc_fops);
- if (dent == NULL || IS_ERR(dent))
- pr_err("%s: ERR debugfs_create_file: dent=0x%x\n",
- __func__, (unsigned)dent);
- nfcdev->dent = dent;
- return 0;
- }
- #endif
- static int __devinit pm8xxx_nfc_probe(struct platform_device *pdev)
- {
- struct pm8xxx_nfc_device *nfcdev;
- nfcdev = kzalloc(sizeof *nfcdev, GFP_KERNEL);
- if (nfcdev == NULL) {
- pr_err("%s: kzalloc() failed.\n", __func__);
- return -ENOMEM;
- }
- mutex_init(&nfcdev->nfc_mutex);
- nfcdev->dev = &pdev->dev;
- nfc_dev = nfcdev;
- platform_set_drvdata(pdev, nfcdev);
- #if defined(CONFIG_DEBUG_FS)
- pm8xxx_nfc_debug_init(nfc_dev);
- #endif
- pr_notice("%s: OK\n", __func__);
- return 0;
- }
- static int __devexit pm8xxx_nfc_remove(struct platform_device *pdev)
- {
- struct pm8xxx_nfc_device *nfcdev = platform_get_drvdata(pdev);
- #if defined(CONFIG_DEBUG_FS)
- debugfs_remove(nfcdev->dent);
- #endif
- platform_set_drvdata(pdev, NULL);
- kfree(nfcdev);
- return 0;
- }
- static struct platform_driver pm8xxx_nfc_driver = {
- .probe = pm8xxx_nfc_probe,
- .remove = __devexit_p(pm8xxx_nfc_remove),
- .driver = {
- .name = PM8XXX_NFC_DEV_NAME,
- .owner = THIS_MODULE,
- },
- };
- static int __init pm8xxx_nfc_init(void)
- {
- return platform_driver_register(&pm8xxx_nfc_driver);
- }
- static void __exit pm8xxx_nfc_exit(void)
- {
- platform_driver_unregister(&pm8xxx_nfc_driver);
- }
- module_init(pm8xxx_nfc_init);
- module_exit(pm8xxx_nfc_exit);
- MODULE_LICENSE("GPL v2");
- MODULE_DESCRIPTION("PM8XXX NFC driver");
- MODULE_VERSION("1.0");
- MODULE_ALIAS("platform:" PM8XXX_NFC_DEV_NAME);
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