246 lines
6.6 KiB
C
246 lines
6.6 KiB
C
/* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
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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 and
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* only version 2 as 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/slab.h>
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#include <linux/spmi.h>
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#include <linux/err.h>
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#include <linux/qpnp/qpnp-revid.h>
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#define REVID_REVISION1 0x0
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#define REVID_REVISION2 0x1
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#define REVID_REVISION3 0x2
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#define REVID_REVISION4 0x3
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#define REVID_TYPE 0x4
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#define REVID_SUBTYPE 0x5
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#define REVID_STATUS1 0x8
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#define REVID_SPARE_0 0x60
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#define QPNP_REVID_DEV_NAME "qcom,qpnp-revid"
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static const char *const pmic_names[] = {
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"Unknown PMIC",
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"PM8941",
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"PM8841",
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"PM8019",
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"PM8226",
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"PM8110",
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"PMA8084",
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"PMI8962",
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"PMD9635",
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"PM8994",
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"PMI8994",
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"PM8916",
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"PM8004",
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"PM8909",
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"PM2433",
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"PMD9655",
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"PM8950",
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"PMI8950",
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"PMK8001",
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"PMI8996",
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[25] = "PM8937",
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[55] = "PMI8937",
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};
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struct revid_chip {
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struct list_head link;
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struct device_node *dev_node;
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struct pmic_revid_data data;
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};
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static LIST_HEAD(revid_chips);
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static DEFINE_MUTEX(revid_chips_lock);
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static struct of_device_id qpnp_revid_match_table[] = {
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{ .compatible = QPNP_REVID_DEV_NAME },
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{}
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};
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static u8 qpnp_read_byte(struct spmi_device *spmi, u16 addr)
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{
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int rc;
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u8 val;
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rc = spmi_ext_register_readl(spmi->ctrl, spmi->sid, addr, &val, 1);
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if (rc) {
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pr_err("SPMI read failed rc=%d\n", rc);
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return 0;
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}
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return val;
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}
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/**
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* get_revid_data - Return the revision information of PMIC
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* @dev_node: Pointer to the revid peripheral of the PMIC for which
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* revision information is seeked
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*
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* CONTEXT: Should be called in non atomic context
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*
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* RETURNS: pointer to struct pmic_revid_data filled with the information
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* about the PMIC revision
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*/
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struct pmic_revid_data *get_revid_data(struct device_node *dev_node)
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{
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struct revid_chip *revid_chip;
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if (!dev_node)
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return ERR_PTR(-EINVAL);
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mutex_lock(&revid_chips_lock);
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list_for_each_entry(revid_chip, &revid_chips, link) {
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if (dev_node == revid_chip->dev_node) {
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mutex_unlock(&revid_chips_lock);
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return &revid_chip->data;
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}
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}
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mutex_unlock(&revid_chips_lock);
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return ERR_PTR(-EINVAL);
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}
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EXPORT_SYMBOL(get_revid_data);
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#define PM8941_PERIPHERAL_SUBTYPE 0x01
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#define PM8226_PERIPHERAL_SUBTYPE 0x04
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#define PMD9655_PERIPHERAL_SUBTYPE 0x0F
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#define PMI8950_PERIPHERAL_SUBTYPE 0x11
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#define PMI8937_PERIPHERAL_SUBTYPE 0x37
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static size_t build_pmic_string(char *buf, size_t n, int sid,
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u8 subtype, u8 rev1, u8 rev2, u8 rev3, u8 rev4)
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{
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size_t pos = 0;
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/*
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* In early versions of PM8941 and PM8226, the major revision number
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* started incrementing from 0 (eg 0 = v1.0, 1 = v2.0).
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* Increment the major revision number here if the chip is an early
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* version of PM8941 or PM8226.
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*/
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if (((int)subtype == PM8941_PERIPHERAL_SUBTYPE
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|| (int)subtype == PM8226_PERIPHERAL_SUBTYPE)
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&& rev4 < 0x02)
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rev4++;
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pos += snprintf(buf + pos, n - pos, "PMIC@SID%d", sid);
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if (subtype >= ARRAY_SIZE(pmic_names) || subtype == 0)
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pos += snprintf(buf + pos, n - pos, ": %s (subtype: 0x%02X)",
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pmic_names[0], subtype);
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else
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pos += snprintf(buf + pos, n - pos, ": %s",
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pmic_names[subtype]);
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pos += snprintf(buf + pos, n - pos, " v%d.%d", rev4, rev3);
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if (rev2 || rev1)
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pos += snprintf(buf + pos, n - pos, ".%d", rev2);
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if (rev1)
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pos += snprintf(buf + pos, n - pos, ".%d", rev1);
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return pos;
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}
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#define PMIC_PERIPHERAL_TYPE 0x51
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#define PMIC_STRING_MAXLENGTH 80
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static int qpnp_revid_probe(struct spmi_device *spmi)
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{
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u8 rev1, rev2, rev3, rev4, pmic_type, pmic_subtype, pmic_status;
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u8 option1, option2, option3, option4, spare0;
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struct resource *resource;
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char pmic_string[PMIC_STRING_MAXLENGTH] = {'\0'};
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struct revid_chip *revid_chip;
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resource = spmi_get_resource(spmi, NULL, IORESOURCE_MEM, 0);
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if (!resource) {
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pr_err("Unable to get spmi resource for REVID\n");
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return -EINVAL;
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}
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pmic_type = qpnp_read_byte(spmi, resource->start + REVID_TYPE);
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if (pmic_type != PMIC_PERIPHERAL_TYPE) {
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pr_err("Invalid REVID peripheral type: %02X\n", pmic_type);
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return -EINVAL;
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}
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rev1 = qpnp_read_byte(spmi, resource->start + REVID_REVISION1);
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rev2 = qpnp_read_byte(spmi, resource->start + REVID_REVISION2);
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rev3 = qpnp_read_byte(spmi, resource->start + REVID_REVISION3);
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rev4 = qpnp_read_byte(spmi, resource->start + REVID_REVISION4);
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pmic_subtype = qpnp_read_byte(spmi, resource->start + REVID_SUBTYPE);
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if (pmic_subtype != PMD9655_PERIPHERAL_SUBTYPE)
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pmic_status = qpnp_read_byte(spmi,
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resource->start + REVID_STATUS1);
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else
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pmic_status = 0;
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/* special case for PMI8937 */
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if (pmic_subtype == PMI8950_PERIPHERAL_SUBTYPE) {
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/* read spare register */
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spare0 = qpnp_read_byte(spmi, resource->start + REVID_SPARE_0);
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if (spare0)
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pmic_subtype = PMI8937_PERIPHERAL_SUBTYPE;
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}
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revid_chip = devm_kzalloc(&spmi->dev, sizeof(struct revid_chip),
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GFP_KERNEL);
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if (!revid_chip)
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return -ENOMEM;
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revid_chip->dev_node = spmi->dev.of_node;
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revid_chip->data.rev1 = rev1;
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revid_chip->data.rev2 = rev2;
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revid_chip->data.rev3 = rev3;
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revid_chip->data.rev4 = rev4;
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revid_chip->data.pmic_subtype = pmic_subtype;
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revid_chip->data.pmic_type = pmic_type;
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if (pmic_subtype < ARRAY_SIZE(pmic_names))
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revid_chip->data.pmic_name = pmic_names[pmic_subtype];
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else
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revid_chip->data.pmic_name = pmic_names[0];
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mutex_lock(&revid_chips_lock);
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list_add(&revid_chip->link, &revid_chips);
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mutex_unlock(&revid_chips_lock);
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option1 = pmic_status & 0x3;
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option2 = (pmic_status >> 2) & 0x3;
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option3 = (pmic_status >> 4) & 0x3;
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option4 = (pmic_status >> 6) & 0x3;
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build_pmic_string(pmic_string, PMIC_STRING_MAXLENGTH, spmi->sid,
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pmic_subtype, rev1, rev2, rev3, rev4);
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pr_info("%s options: %d, %d, %d, %d\n",
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pmic_string, option1, option2, option3, option4);
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return 0;
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}
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static struct spmi_driver qpnp_revid_driver = {
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.probe = qpnp_revid_probe,
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.driver = {
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.name = QPNP_REVID_DEV_NAME,
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.owner = THIS_MODULE,
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.of_match_table = qpnp_revid_match_table,
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},
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};
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static int __init qpnp_revid_init(void)
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{
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return spmi_driver_register(&qpnp_revid_driver);
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}
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static void __exit qpnp_revid_exit(void)
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{
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return spmi_driver_unregister(&qpnp_revid_driver);
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}
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subsys_initcall(qpnp_revid_init);
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module_exit(qpnp_revid_exit);
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MODULE_DESCRIPTION("QPNP REVID DRIVER");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:" QPNP_REVID_DEV_NAME);
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