476 lines
11 KiB
C
476 lines
11 KiB
C
/*
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* tps65217.c
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*
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* TPS65217 chip family multi-function driver
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*
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* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of 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/device.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/tps65217.h>
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static struct resource charger_resources[] = {
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DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_AC, "AC"),
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DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_USB, "USB"),
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};
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static struct resource pb_resources[] = {
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DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_PB, "PB"),
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};
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struct tps65217_irq {
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int mask;
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int interrupt;
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};
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static const struct tps65217_irq tps65217_irqs[] = {
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[TPS65217_IRQ_PB] = {
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.mask = TPS65217_INT_PBM,
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.interrupt = TPS65217_INT_PBI,
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},
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[TPS65217_IRQ_AC] = {
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.mask = TPS65217_INT_ACM,
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.interrupt = TPS65217_INT_ACI,
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},
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[TPS65217_IRQ_USB] = {
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.mask = TPS65217_INT_USBM,
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.interrupt = TPS65217_INT_USBI,
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},
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};
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static void tps65217_irq_lock(struct irq_data *data)
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{
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struct tps65217 *tps = irq_data_get_irq_chip_data(data);
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mutex_lock(&tps->irq_lock);
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}
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static void tps65217_irq_sync_unlock(struct irq_data *data)
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{
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struct tps65217 *tps = irq_data_get_irq_chip_data(data);
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int ret;
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ret = tps65217_reg_write(tps, TPS65217_REG_INT, tps->irq_mask,
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TPS65217_PROTECT_NONE);
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if (ret != 0)
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dev_err(tps->dev, "Failed to sync IRQ masks\n");
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mutex_unlock(&tps->irq_lock);
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}
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static inline const struct tps65217_irq *
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irq_to_tps65217_irq(struct tps65217 *tps, struct irq_data *data)
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{
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return &tps65217_irqs[data->hwirq];
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}
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static void tps65217_irq_enable(struct irq_data *data)
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{
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struct tps65217 *tps = irq_data_get_irq_chip_data(data);
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const struct tps65217_irq *irq_data = irq_to_tps65217_irq(tps, data);
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tps->irq_mask &= ~irq_data->mask;
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}
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static void tps65217_irq_disable(struct irq_data *data)
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{
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struct tps65217 *tps = irq_data_get_irq_chip_data(data);
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const struct tps65217_irq *irq_data = irq_to_tps65217_irq(tps, data);
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tps->irq_mask |= irq_data->mask;
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}
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static struct irq_chip tps65217_irq_chip = {
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.irq_bus_lock = tps65217_irq_lock,
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.irq_bus_sync_unlock = tps65217_irq_sync_unlock,
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.irq_enable = tps65217_irq_enable,
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.irq_disable = tps65217_irq_disable,
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};
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static struct mfd_cell tps65217s[] = {
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{
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.name = "tps65217-pmic",
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.of_compatible = "ti,tps65217-pmic",
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},
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{
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.name = "tps65217-bl",
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.of_compatible = "ti,tps65217-bl",
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},
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{
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.name = "tps65217-charger",
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.num_resources = ARRAY_SIZE(charger_resources),
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.resources = charger_resources,
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.of_compatible = "ti,tps65217-charger",
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},
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{
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.name = "tps65217-pwrbutton",
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.num_resources = ARRAY_SIZE(pb_resources),
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.resources = pb_resources,
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.of_compatible = "ti,tps65217-pwrbutton",
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},
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};
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static irqreturn_t tps65217_irq_thread(int irq, void *data)
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{
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struct tps65217 *tps = data;
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unsigned int status;
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bool handled = false;
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int i;
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int ret;
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ret = tps65217_reg_read(tps, TPS65217_REG_INT, &status);
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if (ret < 0) {
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dev_err(tps->dev, "Failed to read IRQ status: %d\n",
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ret);
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return IRQ_NONE;
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}
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for (i = 0; i < ARRAY_SIZE(tps65217_irqs); i++) {
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if (status & tps65217_irqs[i].interrupt) {
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handle_nested_irq(irq_find_mapping(tps->irq_domain, i));
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handled = true;
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}
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}
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if (handled)
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return IRQ_HANDLED;
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return IRQ_NONE;
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}
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static int tps65217_irq_map(struct irq_domain *h, unsigned int virq,
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irq_hw_number_t hw)
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{
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struct tps65217 *tps = h->host_data;
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irq_set_chip_data(virq, tps);
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irq_set_chip_and_handler(virq, &tps65217_irq_chip, handle_edge_irq);
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irq_set_nested_thread(virq, 1);
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irq_set_parent(virq, tps->irq);
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irq_set_noprobe(virq);
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return 0;
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}
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static const struct irq_domain_ops tps65217_irq_domain_ops = {
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.map = tps65217_irq_map,
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};
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static int tps65217_irq_init(struct tps65217 *tps, int irq)
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{
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int ret;
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mutex_init(&tps->irq_lock);
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tps->irq = irq;
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/* Mask all interrupt sources */
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tps->irq_mask = (TPS65217_INT_RESERVEDM | TPS65217_INT_PBM
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| TPS65217_INT_ACM | TPS65217_INT_USBM);
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tps65217_reg_write(tps, TPS65217_REG_INT, tps->irq_mask,
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TPS65217_PROTECT_NONE);
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tps->irq_domain = irq_domain_add_linear(tps->dev->of_node,
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TPS65217_NUM_IRQ, &tps65217_irq_domain_ops, tps);
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if (!tps->irq_domain) {
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dev_err(tps->dev, "Could not create IRQ domain\n");
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return -ENOMEM;
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}
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ret = devm_request_threaded_irq(tps->dev, irq, NULL,
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tps65217_irq_thread, IRQF_ONESHOT,
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"tps65217-irq", tps);
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if (ret) {
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dev_err(tps->dev, "Failed to request IRQ %d: %d\n",
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irq, ret);
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return ret;
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}
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return 0;
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}
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/**
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* tps65217_reg_read: Read a single tps65217 register.
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*
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* @tps: Device to read from.
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* @reg: Register to read.
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* @val: Contians the value
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*/
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int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
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unsigned int *val)
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{
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return regmap_read(tps->regmap, reg, val);
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}
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EXPORT_SYMBOL_GPL(tps65217_reg_read);
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/**
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* tps65217_reg_write: Write a single tps65217 register.
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*
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* @tps65217: Device to write to.
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* @reg: Register to write to.
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* @val: Value to write.
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* @level: Password protected level
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*/
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int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
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unsigned int val, unsigned int level)
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{
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int ret;
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unsigned int xor_reg_val;
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switch (level) {
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case TPS65217_PROTECT_NONE:
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return regmap_write(tps->regmap, reg, val);
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case TPS65217_PROTECT_L1:
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xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
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ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
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xor_reg_val);
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if (ret < 0)
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return ret;
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return regmap_write(tps->regmap, reg, val);
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case TPS65217_PROTECT_L2:
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xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
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ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
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xor_reg_val);
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if (ret < 0)
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return ret;
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ret = regmap_write(tps->regmap, reg, val);
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if (ret < 0)
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return ret;
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ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
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xor_reg_val);
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if (ret < 0)
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return ret;
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return regmap_write(tps->regmap, reg, val);
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default:
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return -EINVAL;
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}
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}
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EXPORT_SYMBOL_GPL(tps65217_reg_write);
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/**
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* tps65217_update_bits: Modify bits w.r.t mask, val and level.
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*
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* @tps65217: Device to write to.
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* @reg: Register to read-write to.
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* @mask: Mask.
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* @val: Value to write.
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* @level: Password protected level
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*/
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static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
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unsigned int mask, unsigned int val, unsigned int level)
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{
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int ret;
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unsigned int data;
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ret = tps65217_reg_read(tps, reg, &data);
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if (ret) {
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dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
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return ret;
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}
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data &= ~mask;
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data |= val & mask;
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ret = tps65217_reg_write(tps, reg, data, level);
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if (ret)
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dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
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return ret;
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}
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int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
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unsigned int mask, unsigned int val, unsigned int level)
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{
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return tps65217_update_bits(tps, reg, mask, val, level);
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}
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EXPORT_SYMBOL_GPL(tps65217_set_bits);
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int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
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unsigned int mask, unsigned int level)
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{
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return tps65217_update_bits(tps, reg, mask, 0, level);
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}
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EXPORT_SYMBOL_GPL(tps65217_clear_bits);
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static bool tps65217_volatile_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case TPS65217_REG_INT:
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return true;
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default:
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return false;
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}
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}
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static const struct regmap_config tps65217_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = TPS65217_REG_MAX,
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.volatile_reg = tps65217_volatile_reg,
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};
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static const struct of_device_id tps65217_of_match[] = {
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{ .compatible = "ti,tps65217", .data = (void *)TPS65217 },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, tps65217_of_match);
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static int tps65217_probe(struct i2c_client *client,
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const struct i2c_device_id *ids)
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{
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struct tps65217 *tps;
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unsigned int version;
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unsigned long chip_id = ids->driver_data;
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const struct of_device_id *match;
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bool status_off = false;
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int ret;
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if (client->dev.of_node) {
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match = of_match_device(tps65217_of_match, &client->dev);
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if (!match) {
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dev_err(&client->dev,
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"Failed to find matching dt id\n");
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return -EINVAL;
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}
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chip_id = (unsigned long)match->data;
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status_off = of_property_read_bool(client->dev.of_node,
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"ti,pmic-shutdown-controller");
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}
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if (!chip_id) {
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dev_err(&client->dev, "id is null.\n");
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return -ENODEV;
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}
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tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
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if (!tps)
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return -ENOMEM;
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i2c_set_clientdata(client, tps);
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tps->dev = &client->dev;
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tps->id = chip_id;
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tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
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if (IS_ERR(tps->regmap)) {
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ret = PTR_ERR(tps->regmap);
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dev_err(tps->dev, "Failed to allocate register map: %d\n",
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ret);
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return ret;
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}
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if (client->irq) {
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tps65217_irq_init(tps, client->irq);
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} else {
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int i;
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/* Don't tell children about IRQ resources which won't fire */
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for (i = 0; i < ARRAY_SIZE(tps65217s); i++)
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tps65217s[i].num_resources = 0;
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}
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ret = devm_mfd_add_devices(tps->dev, -1, tps65217s,
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ARRAY_SIZE(tps65217s), NULL, 0,
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tps->irq_domain);
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if (ret < 0) {
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dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
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return ret;
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}
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ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
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if (ret < 0) {
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dev_err(tps->dev, "Failed to read revision register: %d\n",
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ret);
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return ret;
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}
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/* Set the PMIC to shutdown on PWR_EN toggle */
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if (status_off) {
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ret = tps65217_set_bits(tps, TPS65217_REG_STATUS,
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TPS65217_STATUS_OFF, TPS65217_STATUS_OFF,
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TPS65217_PROTECT_NONE);
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if (ret)
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dev_warn(tps->dev, "unable to set the status OFF\n");
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}
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dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
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(version & TPS65217_CHIPID_CHIP_MASK) >> 4,
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version & TPS65217_CHIPID_REV_MASK);
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return 0;
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}
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static int tps65217_remove(struct i2c_client *client)
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{
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struct tps65217 *tps = i2c_get_clientdata(client);
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unsigned int virq;
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int i;
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for (i = 0; i < ARRAY_SIZE(tps65217_irqs); i++) {
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virq = irq_find_mapping(tps->irq_domain, i);
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if (virq)
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irq_dispose_mapping(virq);
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}
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irq_domain_remove(tps->irq_domain);
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tps->irq_domain = NULL;
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return 0;
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}
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static const struct i2c_device_id tps65217_id_table[] = {
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{"tps65217", TPS65217},
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
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static struct i2c_driver tps65217_driver = {
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.driver = {
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.name = "tps65217",
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.of_match_table = tps65217_of_match,
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},
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.id_table = tps65217_id_table,
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.probe = tps65217_probe,
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.remove = tps65217_remove,
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};
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static int __init tps65217_init(void)
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{
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return i2c_add_driver(&tps65217_driver);
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}
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subsys_initcall(tps65217_init);
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static void __exit tps65217_exit(void)
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{
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i2c_del_driver(&tps65217_driver);
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}
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module_exit(tps65217_exit);
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MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
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MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
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MODULE_LICENSE("GPL v2");
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