313 lines
7.7 KiB
C
313 lines
7.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* NXP PCF50633 Power Management Unit (PMU) driver
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*
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* (C) 2006-2008 by Openmoko, Inc.
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* Author: Harald Welte <laforge@openmoko.org>
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* Balaji Rao <balajirrao@openmoko.org>
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* All rights reserved.
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*/
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/mutex.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/mfd/pcf50633/core.h>
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#include <linux/mfd/pcf50633/mbc.h>
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int pcf50633_register_irq(struct pcf50633 *pcf, int irq,
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void (*handler) (int, void *), void *data)
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{
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if (irq < 0 || irq >= PCF50633_NUM_IRQ || !handler)
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return -EINVAL;
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if (WARN_ON(pcf->irq_handler[irq].handler))
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return -EBUSY;
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mutex_lock(&pcf->lock);
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pcf->irq_handler[irq].handler = handler;
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pcf->irq_handler[irq].data = data;
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mutex_unlock(&pcf->lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(pcf50633_register_irq);
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int pcf50633_free_irq(struct pcf50633 *pcf, int irq)
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{
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if (irq < 0 || irq >= PCF50633_NUM_IRQ)
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return -EINVAL;
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mutex_lock(&pcf->lock);
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pcf->irq_handler[irq].handler = NULL;
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mutex_unlock(&pcf->lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(pcf50633_free_irq);
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static int __pcf50633_irq_mask_set(struct pcf50633 *pcf, int irq, u8 mask)
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{
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u8 reg, bit;
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int idx;
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idx = irq >> 3;
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reg = PCF50633_REG_INT1M + idx;
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bit = 1 << (irq & 0x07);
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pcf50633_reg_set_bit_mask(pcf, reg, bit, mask ? bit : 0);
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mutex_lock(&pcf->lock);
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if (mask)
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pcf->mask_regs[idx] |= bit;
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else
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pcf->mask_regs[idx] &= ~bit;
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mutex_unlock(&pcf->lock);
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return 0;
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}
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int pcf50633_irq_mask(struct pcf50633 *pcf, int irq)
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{
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dev_dbg(pcf->dev, "Masking IRQ %d\n", irq);
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return __pcf50633_irq_mask_set(pcf, irq, 1);
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}
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EXPORT_SYMBOL_GPL(pcf50633_irq_mask);
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int pcf50633_irq_unmask(struct pcf50633 *pcf, int irq)
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{
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dev_dbg(pcf->dev, "Unmasking IRQ %d\n", irq);
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return __pcf50633_irq_mask_set(pcf, irq, 0);
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}
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EXPORT_SYMBOL_GPL(pcf50633_irq_unmask);
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int pcf50633_irq_mask_get(struct pcf50633 *pcf, int irq)
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{
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u8 reg, bits;
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reg = irq >> 3;
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bits = 1 << (irq & 0x07);
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return pcf->mask_regs[reg] & bits;
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}
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EXPORT_SYMBOL_GPL(pcf50633_irq_mask_get);
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static void pcf50633_irq_call_handler(struct pcf50633 *pcf, int irq)
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{
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if (pcf->irq_handler[irq].handler)
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pcf->irq_handler[irq].handler(irq, pcf->irq_handler[irq].data);
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}
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/* Maximum amount of time ONKEY is held before emergency action is taken */
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#define PCF50633_ONKEY1S_TIMEOUT 8
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static irqreturn_t pcf50633_irq(int irq, void *data)
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{
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struct pcf50633 *pcf = data;
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int ret, i, j;
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u8 pcf_int[5], chgstat;
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/* Read the 5 INT regs in one transaction */
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ret = pcf50633_read_block(pcf, PCF50633_REG_INT1,
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ARRAY_SIZE(pcf_int), pcf_int);
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if (ret != ARRAY_SIZE(pcf_int)) {
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dev_err(pcf->dev, "Error reading INT registers\n");
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/*
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* If this doesn't ACK the interrupt to the chip, we'll be
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* called once again as we're level triggered.
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*/
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goto out;
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}
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/* defeat 8s death from lowsys on A5 */
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pcf50633_reg_write(pcf, PCF50633_REG_OOCSHDWN, 0x04);
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/* We immediately read the usb and adapter status. We thus make sure
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* only of USBINS/USBREM IRQ handlers are called */
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if (pcf_int[0] & (PCF50633_INT1_USBINS | PCF50633_INT1_USBREM)) {
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chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
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if (chgstat & (0x3 << 4))
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pcf_int[0] &= ~PCF50633_INT1_USBREM;
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else
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pcf_int[0] &= ~PCF50633_INT1_USBINS;
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}
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/* Make sure only one of ADPINS or ADPREM is set */
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if (pcf_int[0] & (PCF50633_INT1_ADPINS | PCF50633_INT1_ADPREM)) {
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chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
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if (chgstat & (0x3 << 4))
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pcf_int[0] &= ~PCF50633_INT1_ADPREM;
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else
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pcf_int[0] &= ~PCF50633_INT1_ADPINS;
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}
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dev_dbg(pcf->dev, "INT1=0x%02x INT2=0x%02x INT3=0x%02x "
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"INT4=0x%02x INT5=0x%02x\n", pcf_int[0],
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pcf_int[1], pcf_int[2], pcf_int[3], pcf_int[4]);
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/* Some revisions of the chip don't have a 8s standby mode on
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* ONKEY1S press. We try to manually do it in such cases. */
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if ((pcf_int[0] & PCF50633_INT1_SECOND) && pcf->onkey1s_held) {
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dev_info(pcf->dev, "ONKEY1S held for %d secs\n",
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pcf->onkey1s_held);
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if (pcf->onkey1s_held++ == PCF50633_ONKEY1S_TIMEOUT)
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if (pcf->pdata->force_shutdown)
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pcf->pdata->force_shutdown(pcf);
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}
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if (pcf_int[2] & PCF50633_INT3_ONKEY1S) {
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dev_info(pcf->dev, "ONKEY1S held\n");
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pcf->onkey1s_held = 1 ;
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/* Unmask IRQ_SECOND */
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pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT1M,
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PCF50633_INT1_SECOND);
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/* Unmask IRQ_ONKEYR */
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pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT2M,
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PCF50633_INT2_ONKEYR);
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}
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if ((pcf_int[1] & PCF50633_INT2_ONKEYR) && pcf->onkey1s_held) {
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pcf->onkey1s_held = 0;
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/* Mask SECOND and ONKEYR interrupts */
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if (pcf->mask_regs[0] & PCF50633_INT1_SECOND)
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pcf50633_reg_set_bit_mask(pcf,
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PCF50633_REG_INT1M,
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PCF50633_INT1_SECOND,
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PCF50633_INT1_SECOND);
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if (pcf->mask_regs[1] & PCF50633_INT2_ONKEYR)
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pcf50633_reg_set_bit_mask(pcf,
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PCF50633_REG_INT2M,
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PCF50633_INT2_ONKEYR,
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PCF50633_INT2_ONKEYR);
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}
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/* Have we just resumed ? */
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if (pcf->is_suspended) {
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pcf->is_suspended = 0;
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/* Set the resume reason filtering out non resumers */
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for (i = 0; i < ARRAY_SIZE(pcf_int); i++)
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pcf->resume_reason[i] = pcf_int[i] &
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pcf->pdata->resumers[i];
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/* Make sure we don't pass on any ONKEY events to
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* userspace now */
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pcf_int[1] &= ~(PCF50633_INT2_ONKEYR | PCF50633_INT2_ONKEYF);
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}
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for (i = 0; i < ARRAY_SIZE(pcf_int); i++) {
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/* Unset masked interrupts */
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pcf_int[i] &= ~pcf->mask_regs[i];
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for (j = 0; j < 8 ; j++)
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if (pcf_int[i] & (1 << j))
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pcf50633_irq_call_handler(pcf, (i * 8) + j);
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}
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out:
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return IRQ_HANDLED;
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}
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static int pcf50633_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct pcf50633 *pcf = i2c_get_clientdata(client);
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int ret;
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int i;
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u8 res[5];
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/* Make sure our interrupt handlers are not called
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* henceforth */
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disable_irq(pcf->irq);
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/* Save the masks */
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ret = pcf50633_read_block(pcf, PCF50633_REG_INT1M,
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ARRAY_SIZE(pcf->suspend_irq_masks),
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pcf->suspend_irq_masks);
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if (ret < 0) {
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dev_err(pcf->dev, "error saving irq masks\n");
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goto out;
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}
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/* Write wakeup irq masks */
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for (i = 0; i < ARRAY_SIZE(res); i++)
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res[i] = ~pcf->pdata->resumers[i];
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ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
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ARRAY_SIZE(res), &res[0]);
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if (ret < 0) {
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dev_err(pcf->dev, "error writing wakeup irq masks\n");
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goto out;
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}
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pcf->is_suspended = 1;
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out:
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return ret;
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}
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static int pcf50633_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct pcf50633 *pcf = i2c_get_clientdata(client);
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int ret;
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/* Write the saved mask registers */
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ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
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ARRAY_SIZE(pcf->suspend_irq_masks),
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pcf->suspend_irq_masks);
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if (ret < 0)
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dev_err(pcf->dev, "Error restoring saved suspend masks\n");
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enable_irq(pcf->irq);
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return ret;
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}
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EXPORT_GPL_SIMPLE_DEV_PM_OPS(pcf50633_pm, pcf50633_suspend, pcf50633_resume);
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int pcf50633_irq_init(struct pcf50633 *pcf, int irq)
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{
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int ret;
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pcf->irq = irq;
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/* Enable all interrupts except RTC SECOND */
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pcf->mask_regs[0] = 0x80;
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pcf50633_reg_write(pcf, PCF50633_REG_INT1M, pcf->mask_regs[0]);
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pcf50633_reg_write(pcf, PCF50633_REG_INT2M, 0x00);
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pcf50633_reg_write(pcf, PCF50633_REG_INT3M, 0x00);
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pcf50633_reg_write(pcf, PCF50633_REG_INT4M, 0x00);
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pcf50633_reg_write(pcf, PCF50633_REG_INT5M, 0x00);
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ret = request_threaded_irq(irq, NULL, pcf50633_irq,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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"pcf50633", pcf);
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if (ret)
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dev_err(pcf->dev, "Failed to request IRQ %d\n", ret);
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if (enable_irq_wake(irq) < 0)
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dev_err(pcf->dev, "IRQ %u cannot be enabled as wake-up source"
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"in this hardware revision", irq);
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return ret;
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}
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void pcf50633_irq_free(struct pcf50633 *pcf)
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{
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free_irq(pcf->irq, pcf);
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}
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