mfd: Initial max8925 support
Basic Max8925 support, which is a power management IC from Maxim Semiconductor. Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Haojian Zhuang
Samuel Ortiz
parent
34a4b2391e
commit
d50f8f339f
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@ -194,6 +194,15 @@ config PMIC_ADP5520
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individual components like LCD backlight, LEDs, GPIOs and Kepad
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under the corresponding menus.
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config MFD_MAX8925
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tristate "Maxim Semiconductor MAX8925 PMIC Support"
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depends on I2C
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help
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Say yes here to support for Maxim Semiconductor MAX8925. This is
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a Power Management IC. This driver provies common support for
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accessing the device, additional drivers must be enabled in order
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to use the functionality of the device.
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config MFD_WM8400
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tristate "Support Wolfson Microelectronics WM8400"
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select MFD_CORE
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@ -49,6 +49,8 @@ endif
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obj-$(CONFIG_UCB1400_CORE) += ucb1400_core.o
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obj-$(CONFIG_PMIC_DA903X) += da903x.o
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max8925-objs := max8925-core.o max8925-i2c.o
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obj-$(CONFIG_MFD_MAX8925) += max8925.o
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obj-$(CONFIG_MFD_PCF50633) += pcf50633-core.o
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obj-$(CONFIG_PCF50633_ADC) += pcf50633-adc.o
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@ -0,0 +1,262 @@
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/*
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* Base driver for Maxim MAX8925
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*
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* Copyright (C) 2009 Marvell International Ltd.
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* Haojian Zhuang <haojian.zhuang@marvell.com>
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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 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/max8925.h>
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#define IRQ_MODE_STATUS 0
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#define IRQ_MODE_MASK 1
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static int __get_irq_offset(struct max8925_chip *chip, int irq, int mode,
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int *offset, int *bit)
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{
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if (!offset || !bit)
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return -EINVAL;
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switch (chip->chip_id) {
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case MAX8925_GPM:
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*bit = irq % BITS_PER_BYTE;
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if (irq < (BITS_PER_BYTE << 1)) { /* irq = [0,15] */
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*offset = (mode) ? MAX8925_CHG_IRQ1_MASK
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: MAX8925_CHG_IRQ1;
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if (irq >= BITS_PER_BYTE)
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(*offset)++;
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} else { /* irq = [16,31] */
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*offset = (mode) ? MAX8925_ON_OFF_IRQ1_MASK
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: MAX8925_ON_OFF_IRQ1;
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if (irq >= (BITS_PER_BYTE * 3))
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(*offset)++;
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}
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break;
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case MAX8925_ADC:
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*bit = irq % BITS_PER_BYTE;
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*offset = (mode) ? MAX8925_TSC_IRQ_MASK : MAX8925_TSC_IRQ;
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break;
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default:
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goto out;
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}
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return 0;
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out:
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dev_err(chip->dev, "Wrong irq #%d is assigned\n", irq);
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return -EINVAL;
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}
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static int __check_irq(int irq)
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{
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if ((irq < 0) || (irq >= MAX8925_NUM_IRQ))
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return -EINVAL;
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return 0;
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}
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int max8925_mask_irq(struct max8925_chip *chip, int irq)
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{
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int offset, bit, ret;
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ret = __get_irq_offset(chip, irq, IRQ_MODE_MASK, &offset, &bit);
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if (ret < 0)
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return ret;
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ret = max8925_set_bits(chip->i2c, offset, 1 << bit, 1 << bit);
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return ret;
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}
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int max8925_unmask_irq(struct max8925_chip *chip, int irq)
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{
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int offset, bit, ret;
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ret = __get_irq_offset(chip, irq, IRQ_MODE_MASK, &offset, &bit);
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if (ret < 0)
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return ret;
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ret = max8925_set_bits(chip->i2c, offset, 1 << bit, 0);
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return ret;
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}
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#define INT_STATUS_NUM (MAX8925_NUM_IRQ / BITS_PER_BYTE)
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static irqreturn_t max8925_irq_thread(int irq, void *data)
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{
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struct max8925_chip *chip = data;
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unsigned long irq_status[INT_STATUS_NUM];
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unsigned char status_buf[INT_STATUS_NUM << 1];
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int i, ret;
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memset(irq_status, 0, sizeof(unsigned long) * INT_STATUS_NUM);
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/* all these interrupt status registers are read-only */
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switch (chip->chip_id) {
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case MAX8925_GPM:
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ret = max8925_bulk_read(chip->i2c, MAX8925_CHG_IRQ1,
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4, status_buf);
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if (ret < 0)
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goto out;
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ret = max8925_bulk_read(chip->i2c, MAX8925_ON_OFF_IRQ1,
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2, &status_buf[4]);
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if (ret < 0)
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goto out;
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ret = max8925_bulk_read(chip->i2c, MAX8925_ON_OFF_IRQ2,
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2, &status_buf[6]);
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if (ret < 0)
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goto out;
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/* clear masked interrupt status */
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status_buf[0] &= (~status_buf[2] & CHG_IRQ1_MASK);
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irq_status[0] |= status_buf[0];
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status_buf[1] &= (~status_buf[3] & CHG_IRQ2_MASK);
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irq_status[0] |= (status_buf[1] << BITS_PER_BYTE);
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status_buf[4] &= (~status_buf[5] & ON_OFF_IRQ1_MASK);
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irq_status[0] |= (status_buf[4] << (BITS_PER_BYTE * 2));
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status_buf[6] &= (~status_buf[7] & ON_OFF_IRQ2_MASK);
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irq_status[0] |= (status_buf[6] << (BITS_PER_BYTE * 3));
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break;
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case MAX8925_ADC:
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ret = max8925_bulk_read(chip->i2c, MAX8925_TSC_IRQ,
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2, status_buf);
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if (ret < 0)
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goto out;
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/* clear masked interrupt status */
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status_buf[0] &= (~status_buf[1] & TSC_IRQ_MASK);
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irq_status[0] |= status_buf[0];
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break;
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default:
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goto out;
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}
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for_each_bit(i, &irq_status[0], MAX8925_NUM_IRQ) {
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clear_bit(i, irq_status);
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dev_dbg(chip->dev, "Servicing IRQ #%d in %s\n", i, chip->name);
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mutex_lock(&chip->irq_lock);
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if (chip->irq[i].handler)
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chip->irq[i].handler(i, chip->irq[i].data);
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else {
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max8925_mask_irq(chip, i);
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dev_err(chip->dev, "Noboday cares IRQ #%d in %s. "
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"Now mask it.\n", i, chip->name);
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}
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mutex_unlock(&chip->irq_lock);
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}
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out:
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return IRQ_HANDLED;
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}
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int max8925_request_irq(struct max8925_chip *chip, int irq,
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irq_handler_t handler, void *data)
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{
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if ((__check_irq(irq) < 0) || !handler)
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return -EINVAL;
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mutex_lock(&chip->irq_lock);
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chip->irq[irq].handler = handler;
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chip->irq[irq].data = data;
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mutex_unlock(&chip->irq_lock);
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return 0;
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}
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EXPORT_SYMBOL(max8925_request_irq);
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int max8925_free_irq(struct max8925_chip *chip, int irq)
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{
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if (__check_irq(irq) < 0)
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return -EINVAL;
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mutex_lock(&chip->irq_lock);
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chip->irq[irq].handler = NULL;
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chip->irq[irq].data = NULL;
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mutex_unlock(&chip->irq_lock);
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return 0;
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}
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EXPORT_SYMBOL(max8925_free_irq);
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static int __devinit device_gpm_init(struct max8925_chip *chip,
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struct i2c_client *i2c,
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struct max8925_platform_data *pdata)
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{
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int ret;
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/* mask all IRQs */
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ret = max8925_set_bits(i2c, MAX8925_CHG_IRQ1_MASK, 0x7, 0x7);
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if (ret < 0)
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goto out;
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ret = max8925_set_bits(i2c, MAX8925_CHG_IRQ2_MASK, 0xff, 0xff);
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if (ret < 0)
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goto out;
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ret = max8925_set_bits(i2c, MAX8925_ON_OFF_IRQ1_MASK, 0xff, 0xff);
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if (ret < 0)
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goto out;
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ret = max8925_set_bits(i2c, MAX8925_ON_OFF_IRQ2_MASK, 0x3, 0x3);
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if (ret < 0)
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goto out;
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chip->name = "GPM";
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memset(chip->irq, 0, sizeof(struct max8925_irq) * MAX8925_NUM_IRQ);
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ret = request_threaded_irq(i2c->irq, NULL, max8925_irq_thread,
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IRQF_ONESHOT | IRQF_TRIGGER_LOW,
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"max8925-gpm", chip);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to request IRQ #%d.\n", i2c->irq);
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goto out;
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}
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chip->chip_irq = i2c->irq;
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/* enable hard-reset for ONKEY power-off */
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max8925_set_bits(i2c, MAX8925_SYSENSEL, 0x80, 0x80);
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out:
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return ret;
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}
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static int __devinit device_adc_init(struct max8925_chip *chip,
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struct i2c_client *i2c,
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struct max8925_platform_data *pdata)
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{
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int ret;
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/* mask all IRQs */
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ret = max8925_set_bits(i2c, MAX8925_TSC_IRQ_MASK, 3, 3);
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chip->name = "ADC";
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memset(chip->irq, 0, sizeof(struct max8925_irq) * MAX8925_NUM_IRQ);
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ret = request_threaded_irq(i2c->irq, NULL, max8925_irq_thread,
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IRQF_ONESHOT | IRQF_TRIGGER_LOW,
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"max8925-adc", chip);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to request IRQ #%d.\n", i2c->irq);
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goto out;
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}
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chip->chip_irq = i2c->irq;
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out:
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return ret;
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}
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int __devinit max8925_device_init(struct max8925_chip *chip,
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struct max8925_platform_data *pdata)
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{
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switch (chip->chip_id) {
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case MAX8925_GPM:
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device_gpm_init(chip, chip->i2c, pdata);
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break;
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case MAX8925_ADC:
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device_adc_init(chip, chip->i2c, pdata);
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break;
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}
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return 0;
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}
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void max8925_device_exit(struct max8925_chip *chip)
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{
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if (chip->chip_irq >= 0)
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free_irq(chip->chip_irq, chip);
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}
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MODULE_DESCRIPTION("PMIC Driver for Maxim MAX8925");
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MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com");
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MODULE_LICENSE("GPL");
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@ -0,0 +1,210 @@
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/*
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* I2C driver for Maxim MAX8925
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*
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* Copyright (C) 2009 Marvell International Ltd.
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* Haojian Zhuang <haojian.zhuang@marvell.com>
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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 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/i2c.h>
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#include <linux/mfd/max8925.h>
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static inline int max8925_read_device(struct i2c_client *i2c,
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int reg, int bytes, void *dest)
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{
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unsigned char data;
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unsigned char *buf;
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int ret;
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buf = kzalloc(bytes + 1, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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data = (unsigned char)reg;
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ret = i2c_master_send(i2c, &data, 1);
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if (ret < 0)
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return ret;
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ret = i2c_master_recv(i2c, buf, bytes + 1);
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if (ret < 0)
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return ret;
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memcpy(dest, buf, bytes);
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return 0;
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}
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static inline int max8925_write_device(struct i2c_client *i2c,
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int reg, int bytes, void *src)
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{
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unsigned char buf[bytes + 1];
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int ret;
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buf[0] = (unsigned char)reg;
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memcpy(&buf[1], src, bytes);
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ret = i2c_master_send(i2c, buf, bytes + 1);
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if (ret < 0)
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return ret;
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return 0;
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}
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int max8925_reg_read(struct i2c_client *i2c, int reg)
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{
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struct max8925_chip *chip = i2c_get_clientdata(i2c);
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unsigned char data;
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int ret;
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mutex_lock(&chip->io_lock);
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ret = max8925_read_device(i2c, reg, 1, &data);
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mutex_unlock(&chip->io_lock);
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if (ret < 0)
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return ret;
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else
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return (int)data;
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}
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EXPORT_SYMBOL(max8925_reg_read);
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int max8925_reg_write(struct i2c_client *i2c, int reg,
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unsigned char data)
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{
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struct max8925_chip *chip = i2c_get_clientdata(i2c);
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int ret;
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mutex_lock(&chip->io_lock);
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ret = max8925_write_device(i2c, reg, 1, &data);
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mutex_unlock(&chip->io_lock);
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return ret;
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}
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EXPORT_SYMBOL(max8925_reg_write);
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int max8925_bulk_read(struct i2c_client *i2c, int reg,
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int count, unsigned char *buf)
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{
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struct max8925_chip *chip = i2c_get_clientdata(i2c);
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int ret;
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mutex_lock(&chip->io_lock);
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ret = max8925_read_device(i2c, reg, count, buf);
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mutex_unlock(&chip->io_lock);
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return ret;
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}
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EXPORT_SYMBOL(max8925_bulk_read);
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int max8925_bulk_write(struct i2c_client *i2c, int reg,
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int count, unsigned char *buf)
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{
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struct max8925_chip *chip = i2c_get_clientdata(i2c);
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int ret;
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mutex_lock(&chip->io_lock);
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ret = max8925_write_device(i2c, reg, count, buf);
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mutex_unlock(&chip->io_lock);
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return ret;
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}
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EXPORT_SYMBOL(max8925_bulk_write);
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int max8925_set_bits(struct i2c_client *i2c, int reg,
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unsigned char mask, unsigned char data)
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{
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struct max8925_chip *chip = i2c_get_clientdata(i2c);
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unsigned char value;
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int ret;
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mutex_lock(&chip->io_lock);
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ret = max8925_read_device(i2c, reg, 1, &value);
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if (ret < 0)
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goto out;
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value &= ~mask;
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value |= data;
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ret = max8925_write_device(i2c, reg, 1, &value);
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out:
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mutex_unlock(&chip->io_lock);
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return ret;
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}
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EXPORT_SYMBOL(max8925_set_bits);
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static const struct i2c_device_id max8925_id_table[] = {
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{ "max8925", 0 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, max8925_id_table);
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static int __devinit max8925_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct max8925_platform_data *pdata = client->dev.platform_data;
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struct max8925_chip *chip;
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if (!pdata) {
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pr_info("%s: platform data is missing\n", __func__);
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return -EINVAL;
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}
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if ((pdata->chip_id <= MAX8925_INVALID)
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|| (pdata->chip_id >= MAX8925_MAX)) {
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pr_info("#%s: wrong chip identification\n", __func__);
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return -EINVAL;
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}
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chip = kzalloc(sizeof(struct max8925_chip), GFP_KERNEL);
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if (chip == NULL)
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return -ENOMEM;
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chip->i2c = client;
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chip->chip_id = pdata->chip_id;
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i2c_set_clientdata(client, chip);
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chip->dev = &client->dev;
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mutex_init(&chip->io_lock);
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dev_set_drvdata(chip->dev, chip);
|
||||
max8925_device_init(chip, pdata);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __devexit max8925_remove(struct i2c_client *client)
|
||||
{
|
||||
struct max8925_chip *chip = i2c_get_clientdata(client);
|
||||
|
||||
max8925_device_exit(chip);
|
||||
i2c_set_clientdata(client, NULL);
|
||||
kfree(chip);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct i2c_driver max8925_driver = {
|
||||
.driver = {
|
||||
.name = "max8925",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = max8925_probe,
|
||||
.remove = __devexit_p(max8925_remove),
|
||||
.id_table = max8925_id_table,
|
||||
};
|
||||
|
||||
static int __init max8925_i2c_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = i2c_add_driver(&max8925_driver);
|
||||
if (ret != 0)
|
||||
pr_err("Failed to register MAX8925 I2C driver: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
subsys_initcall(max8925_i2c_init);
|
||||
|
||||
static void __exit max8925_i2c_exit(void)
|
||||
{
|
||||
i2c_del_driver(&max8925_driver);
|
||||
}
|
||||
module_exit(max8925_i2c_exit);
|
||||
|
||||
MODULE_DESCRIPTION("I2C Driver for Maxim 8925");
|
||||
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
@ -0,0 +1,119 @@
|
|||
/*
|
||||
* Maxim8925 Interface
|
||||
*
|
||||
* Copyright (C) 2009 Marvell International Ltd.
|
||||
* Haojian Zhuang <haojian.zhuang@marvell.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#ifndef __LINUX_MFD_MAX8925_H
|
||||
#define __LINUX_MFD_MAX8925_H
|
||||
|
||||
#include <linux/interrupt.h>
|
||||
|
||||
/* Charger registers */
|
||||
#define MAX8925_CHG_IRQ1 (0x7e)
|
||||
#define MAX8925_CHG_IRQ2 (0x7f)
|
||||
#define MAX8925_CHG_IRQ1_MASK (0x80)
|
||||
#define MAX8925_CHG_IRQ2_MASK (0x81)
|
||||
|
||||
/* GPM registers */
|
||||
#define MAX8925_SYSENSEL (0x00)
|
||||
#define MAX8925_ON_OFF_IRQ1 (0x01)
|
||||
#define MAX8925_ON_OFF_IRQ1_MASK (0x02)
|
||||
#define MAX8925_ON_OFF_STAT (0x03)
|
||||
#define MAX8925_ON_OFF_IRQ2 (0x0d)
|
||||
#define MAX8925_ON_OFF_IRQ2_MASK (0x0e)
|
||||
#define MAX8925_RESET_CNFG (0x0f)
|
||||
|
||||
/* Touch registers */
|
||||
#define MAX8925_TSC_IRQ (0x00)
|
||||
#define MAX8925_TSC_IRQ_MASK (0x01)
|
||||
|
||||
/* RTC registers */
|
||||
#define MAX8925_RTC_STATUS (0x1a)
|
||||
#define MAX8925_RTC_IRQ (0x1c)
|
||||
#define MAX8925_RTC_IRQ_MASK (0x1d)
|
||||
|
||||
/* bit definitions */
|
||||
#define CHG_IRQ1_MASK (0x07)
|
||||
#define CHG_IRQ2_MASK (0xff)
|
||||
#define ON_OFF_IRQ1_MASK (0xff)
|
||||
#define ON_OFF_IRQ2_MASK (0x03)
|
||||
#define TSC_IRQ_MASK (0x03)
|
||||
#define RTC_IRQ_MASK (0x0c)
|
||||
|
||||
#define MAX8925_NUM_IRQ (32)
|
||||
|
||||
#define MAX8925_NAME_SIZE (32)
|
||||
|
||||
enum {
|
||||
MAX8925_INVALID = 0,
|
||||
MAX8925_RTC,
|
||||
MAX8925_ADC,
|
||||
MAX8925_GPM, /* general power management */
|
||||
MAX8925_MAX,
|
||||
};
|
||||
|
||||
#define MAX8925_IRQ_VCHG_OVP (0)
|
||||
#define MAX8925_IRQ_VCHG_F (1)
|
||||
#define MAX8925_IRQ_VCHG_R (2)
|
||||
#define MAX8925_IRQ_VCHG_THM_OK_R (8)
|
||||
#define MAX8925_IRQ_VCHG_THM_OK_F (9)
|
||||
#define MAX8925_IRQ_VCHG_BATTLOW_F (10)
|
||||
#define MAX8925_IRQ_VCHG_BATTLOW_R (11)
|
||||
#define MAX8925_IRQ_VCHG_RST (12)
|
||||
#define MAX8925_IRQ_VCHG_DONE (13)
|
||||
#define MAX8925_IRQ_VCHG_TOPOFF (14)
|
||||
#define MAX8925_IRQ_VCHG_TMR_FAULT (15)
|
||||
#define MAX8925_IRQ_GPM_RSTIN (16)
|
||||
#define MAX8925_IRQ_GPM_MPL (17)
|
||||
#define MAX8925_IRQ_GPM_SW_3SEC (18)
|
||||
#define MAX8925_IRQ_GPM_EXTON_F (19)
|
||||
#define MAX8925_IRQ_GPM_EXTON_R (20)
|
||||
#define MAX8925_IRQ_GPM_SW_1SEC (21)
|
||||
#define MAX8925_IRQ_GPM_SW_F (22)
|
||||
#define MAX8925_IRQ_GPM_SW_R (23)
|
||||
#define MAX8925_IRQ_GPM_SYSCKEN_F (24)
|
||||
#define MAX8925_IRQ_GPM_SYSCKEN_R (25)
|
||||
|
||||
#define MAX8925_IRQ_TSC_STICK (0)
|
||||
#define MAX8925_IRQ_TSC_NSTICK (1)
|
||||
|
||||
struct max8925_irq {
|
||||
irq_handler_t handler;
|
||||
void *data;
|
||||
};
|
||||
|
||||
struct max8925_chip {
|
||||
struct device *dev;
|
||||
struct mutex io_lock;
|
||||
struct mutex irq_lock;
|
||||
struct i2c_client *i2c;
|
||||
struct max8925_irq irq[MAX8925_NUM_IRQ];
|
||||
|
||||
const char *name;
|
||||
int chip_id;
|
||||
int chip_irq;
|
||||
};
|
||||
|
||||
struct max8925_platform_data {
|
||||
int chip_id;
|
||||
int chip_irq;
|
||||
};
|
||||
|
||||
extern int max8925_reg_read(struct i2c_client *, int);
|
||||
extern int max8925_reg_write(struct i2c_client *, int, unsigned char);
|
||||
extern int max8925_bulk_read(struct i2c_client *, int, int, unsigned char *);
|
||||
extern int max8925_bulk_write(struct i2c_client *, int, int, unsigned char *);
|
||||
extern int max8925_set_bits(struct i2c_client *, int, unsigned char,
|
||||
unsigned char);
|
||||
|
||||
extern int max8925_device_init(struct max8925_chip *,
|
||||
struct max8925_platform_data *);
|
||||
extern void max8925_device_exit(struct max8925_chip *);
|
||||
#endif /* __LINUX_MFD_MAX8925_H */
|
||||
|
||||
Reference in New Issue