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c9fbf7e070
The WM8994 has an interrupt controller which supports interrupts for both CODEC and GPIO portions of the chip. Support this using genirq, while allowing for systems that do not have an interrupt hooked up. Wrapper functions are provided for the IRQ request and free to simplify the code in consumer drivers when handling cases where IRQs are not set up. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Samuel Ortiz <sameo@linux.intel.com>
574 lines
13 KiB
C
574 lines
13 KiB
C
/*
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* wm8994-core.c -- Device access for Wolfson WM8994
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*
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* Copyright 2009 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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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/delay.h>
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#include <linux/mfd/core.h>
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#include <linux/regulator/consumer.h>
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#include <linux/regulator/machine.h>
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#include <linux/mfd/wm8994/core.h>
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#include <linux/mfd/wm8994/pdata.h>
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#include <linux/mfd/wm8994/registers.h>
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static int wm8994_read(struct wm8994 *wm8994, unsigned short reg,
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int bytes, void *dest)
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{
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int ret, i;
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u16 *buf = dest;
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BUG_ON(bytes % 2);
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BUG_ON(bytes <= 0);
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ret = wm8994->read_dev(wm8994, reg, bytes, dest);
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if (ret < 0)
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return ret;
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for (i = 0; i < bytes / 2; i++) {
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buf[i] = be16_to_cpu(buf[i]);
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dev_vdbg(wm8994->dev, "Read %04x from R%d(0x%x)\n",
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buf[i], reg + i, reg + i);
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}
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return 0;
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}
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/**
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* wm8994_reg_read: Read a single WM8994 register.
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*
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* @wm8994: Device to read from.
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* @reg: Register to read.
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*/
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int wm8994_reg_read(struct wm8994 *wm8994, unsigned short reg)
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{
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unsigned short val;
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int ret;
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mutex_lock(&wm8994->io_lock);
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ret = wm8994_read(wm8994, reg, 2, &val);
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mutex_unlock(&wm8994->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 val;
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}
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EXPORT_SYMBOL_GPL(wm8994_reg_read);
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/**
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* wm8994_bulk_read: Read multiple WM8994 registers
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*
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* @wm8994: Device to read from
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* @reg: First register
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* @count: Number of registers
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* @buf: Buffer to fill.
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*/
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int wm8994_bulk_read(struct wm8994 *wm8994, unsigned short reg,
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int count, u16 *buf)
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{
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int ret;
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mutex_lock(&wm8994->io_lock);
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ret = wm8994_read(wm8994, reg, count * 2, buf);
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mutex_unlock(&wm8994->io_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(wm8994_bulk_read);
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static int wm8994_write(struct wm8994 *wm8994, unsigned short reg,
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int bytes, void *src)
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{
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u16 *buf = src;
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int i;
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BUG_ON(bytes % 2);
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BUG_ON(bytes <= 0);
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for (i = 0; i < bytes / 2; i++) {
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dev_vdbg(wm8994->dev, "Write %04x to R%d(0x%x)\n",
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buf[i], reg + i, reg + i);
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buf[i] = cpu_to_be16(buf[i]);
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}
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return wm8994->write_dev(wm8994, reg, bytes, src);
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}
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/**
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* wm8994_reg_write: Write a single WM8994 register.
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*
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* @wm8994: 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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*/
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int wm8994_reg_write(struct wm8994 *wm8994, unsigned short reg,
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unsigned short val)
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{
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int ret;
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mutex_lock(&wm8994->io_lock);
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ret = wm8994_write(wm8994, reg, 2, &val);
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mutex_unlock(&wm8994->io_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(wm8994_reg_write);
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/**
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* wm8994_set_bits: Set the value of a bitfield in a WM8994 register
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*
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* @wm8994: Device to write to.
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* @reg: Register to write to.
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* @mask: Mask of bits to set.
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* @val: Value to set (unshifted)
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*/
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int wm8994_set_bits(struct wm8994 *wm8994, unsigned short reg,
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unsigned short mask, unsigned short val)
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{
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int ret;
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u16 r;
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mutex_lock(&wm8994->io_lock);
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ret = wm8994_read(wm8994, reg, 2, &r);
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if (ret < 0)
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goto out;
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r &= ~mask;
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r |= val;
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ret = wm8994_write(wm8994, reg, 2, &r);
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out:
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mutex_unlock(&wm8994->io_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(wm8994_set_bits);
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static struct mfd_cell wm8994_regulator_devs[] = {
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{ .name = "wm8994-ldo", .id = 1 },
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{ .name = "wm8994-ldo", .id = 2 },
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};
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static struct resource wm8994_codec_resources[] = {
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{
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.start = WM8994_IRQ_TEMP_SHUT,
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.end = WM8994_IRQ_TEMP_WARN,
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.flags = IORESOURCE_IRQ,
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},
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};
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static struct resource wm8994_gpio_resources[] = {
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{
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.start = WM8994_IRQ_GPIO(1),
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.end = WM8994_IRQ_GPIO(11),
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.flags = IORESOURCE_IRQ,
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},
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};
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static struct mfd_cell wm8994_devs[] = {
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{
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.name = "wm8994-codec",
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.num_resources = ARRAY_SIZE(wm8994_codec_resources),
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.resources = wm8994_codec_resources,
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},
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{
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.name = "wm8994-gpio",
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.num_resources = ARRAY_SIZE(wm8994_gpio_resources),
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.resources = wm8994_gpio_resources,
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},
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};
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/*
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* Supplies for the main bulk of CODEC; the LDO supplies are ignored
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* and should be handled via the standard regulator API supply
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* management.
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*/
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static const char *wm8994_main_supplies[] = {
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"DBVDD",
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"DCVDD",
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"AVDD1",
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"AVDD2",
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"CPVDD",
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"SPKVDD1",
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"SPKVDD2",
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};
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#ifdef CONFIG_PM
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static int wm8994_device_suspend(struct device *dev)
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{
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struct wm8994 *wm8994 = dev_get_drvdata(dev);
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int ret;
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/* GPIO configuration state is saved here since we may be configuring
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* the GPIO alternate functions even if we're not using the gpiolib
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* driver for them.
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*/
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ret = wm8994_read(wm8994, WM8994_GPIO_1, WM8994_NUM_GPIO_REGS * 2,
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&wm8994->gpio_regs);
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if (ret < 0)
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dev_err(dev, "Failed to save GPIO registers: %d\n", ret);
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/* For similar reasons we also stash the regulator states */
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ret = wm8994_read(wm8994, WM8994_LDO_1, WM8994_NUM_LDO_REGS * 2,
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&wm8994->ldo_regs);
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if (ret < 0)
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dev_err(dev, "Failed to save LDO registers: %d\n", ret);
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ret = regulator_bulk_disable(ARRAY_SIZE(wm8994_main_supplies),
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wm8994->supplies);
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if (ret != 0) {
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dev_err(dev, "Failed to disable supplies: %d\n", 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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static int wm8994_device_resume(struct device *dev)
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{
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struct wm8994 *wm8994 = dev_get_drvdata(dev);
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int ret;
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ret = regulator_bulk_enable(ARRAY_SIZE(wm8994_main_supplies),
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wm8994->supplies);
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if (ret != 0) {
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dev_err(dev, "Failed to enable supplies: %d\n", ret);
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return ret;
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}
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ret = wm8994_write(wm8994, WM8994_INTERRUPT_STATUS_1_MASK,
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WM8994_NUM_IRQ_REGS * 2, &wm8994->irq_masks_cur);
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if (ret < 0)
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dev_err(dev, "Failed to restore interrupt masks: %d\n", ret);
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ret = wm8994_write(wm8994, WM8994_LDO_1, WM8994_NUM_LDO_REGS * 2,
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&wm8994->ldo_regs);
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if (ret < 0)
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dev_err(dev, "Failed to restore LDO registers: %d\n", ret);
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ret = wm8994_write(wm8994, WM8994_GPIO_1, WM8994_NUM_GPIO_REGS * 2,
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&wm8994->gpio_regs);
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if (ret < 0)
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dev_err(dev, "Failed to restore GPIO registers: %d\n", ret);
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return 0;
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}
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#endif
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#ifdef CONFIG_REGULATOR
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static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
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{
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struct wm8994_ldo_pdata *ldo_pdata;
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if (!pdata)
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return 0;
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ldo_pdata = &pdata->ldo[ldo];
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if (!ldo_pdata->init_data)
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return 0;
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return ldo_pdata->init_data->num_consumer_supplies != 0;
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}
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#else
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static int wm8994_ldo_in_use(struct wm8994_pdata *pdata, int ldo)
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{
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return 0;
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}
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#endif
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/*
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* Instantiate the generic non-control parts of the device.
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*/
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static int wm8994_device_init(struct wm8994 *wm8994, unsigned long id, int irq)
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{
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struct wm8994_pdata *pdata = wm8994->dev->platform_data;
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int ret, i;
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mutex_init(&wm8994->io_lock);
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dev_set_drvdata(wm8994->dev, wm8994);
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/* Add the on-chip regulators first for bootstrapping */
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ret = mfd_add_devices(wm8994->dev, -1,
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wm8994_regulator_devs,
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ARRAY_SIZE(wm8994_regulator_devs),
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NULL, 0);
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if (ret != 0) {
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dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
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goto err;
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}
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wm8994->supplies = kzalloc(sizeof(struct regulator_bulk_data) *
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ARRAY_SIZE(wm8994_main_supplies),
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GFP_KERNEL);
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if (!wm8994->supplies)
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goto err;
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for (i = 0; i < ARRAY_SIZE(wm8994_main_supplies); i++)
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wm8994->supplies[i].supply = wm8994_main_supplies[i];
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ret = regulator_bulk_get(wm8994->dev, ARRAY_SIZE(wm8994_main_supplies),
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wm8994->supplies);
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if (ret != 0) {
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dev_err(wm8994->dev, "Failed to get supplies: %d\n", ret);
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goto err_supplies;
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}
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ret = regulator_bulk_enable(ARRAY_SIZE(wm8994_main_supplies),
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wm8994->supplies);
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if (ret != 0) {
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dev_err(wm8994->dev, "Failed to enable supplies: %d\n", ret);
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goto err_get;
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}
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ret = wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET);
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if (ret < 0) {
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dev_err(wm8994->dev, "Failed to read ID register\n");
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goto err_enable;
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}
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if (ret != 0x8994) {
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dev_err(wm8994->dev, "Device is not a WM8994, ID is %x\n",
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ret);
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ret = -EINVAL;
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goto err_enable;
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}
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ret = wm8994_reg_read(wm8994, WM8994_CHIP_REVISION);
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if (ret < 0) {
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dev_err(wm8994->dev, "Failed to read revision register: %d\n",
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ret);
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goto err_enable;
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}
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switch (ret) {
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case 0:
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case 1:
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dev_warn(wm8994->dev, "revision %c not fully supported\n",
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'A' + ret);
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break;
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default:
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dev_info(wm8994->dev, "revision %c\n", 'A' + ret);
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break;
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}
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if (pdata) {
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wm8994->irq_base = pdata->irq_base;
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wm8994->gpio_base = pdata->gpio_base;
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/* GPIO configuration is only applied if it's non-zero */
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for (i = 0; i < ARRAY_SIZE(pdata->gpio_defaults); i++) {
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if (pdata->gpio_defaults[i]) {
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wm8994_set_bits(wm8994, WM8994_GPIO_1 + i,
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0xffff,
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pdata->gpio_defaults[i]);
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}
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}
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}
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/* In some system designs where the regulators are not in use,
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* we can achieve a small reduction in leakage currents by
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* floating LDO outputs. This bit makes no difference if the
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* LDOs are enabled, it only affects cases where the LDOs were
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* in operation and are then disabled.
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*/
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for (i = 0; i < WM8994_NUM_LDO_REGS; i++) {
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if (wm8994_ldo_in_use(pdata, i))
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wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
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WM8994_LDO1_DISCH, WM8994_LDO1_DISCH);
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else
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wm8994_set_bits(wm8994, WM8994_LDO_1 + i,
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WM8994_LDO1_DISCH, 0);
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}
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wm8994_irq_init(wm8994);
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ret = mfd_add_devices(wm8994->dev, -1,
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wm8994_devs, ARRAY_SIZE(wm8994_devs),
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NULL, 0);
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if (ret != 0) {
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dev_err(wm8994->dev, "Failed to add children: %d\n", ret);
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goto err_irq;
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}
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return 0;
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err_irq:
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wm8994_irq_exit(wm8994);
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err_enable:
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regulator_bulk_disable(ARRAY_SIZE(wm8994_main_supplies),
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wm8994->supplies);
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err_get:
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regulator_bulk_free(ARRAY_SIZE(wm8994_main_supplies), wm8994->supplies);
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err_supplies:
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kfree(wm8994->supplies);
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err:
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mfd_remove_devices(wm8994->dev);
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kfree(wm8994);
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return ret;
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}
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static void wm8994_device_exit(struct wm8994 *wm8994)
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{
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mfd_remove_devices(wm8994->dev);
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wm8994_irq_exit(wm8994);
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regulator_bulk_disable(ARRAY_SIZE(wm8994_main_supplies),
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wm8994->supplies);
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regulator_bulk_free(ARRAY_SIZE(wm8994_main_supplies), wm8994->supplies);
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kfree(wm8994->supplies);
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kfree(wm8994);
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}
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static int wm8994_i2c_read_device(struct wm8994 *wm8994, unsigned short reg,
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int bytes, void *dest)
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{
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struct i2c_client *i2c = wm8994->control_data;
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int ret;
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u16 r = cpu_to_be16(reg);
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ret = i2c_master_send(i2c, (unsigned char *)&r, 2);
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if (ret < 0)
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return ret;
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if (ret != 2)
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return -EIO;
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ret = i2c_master_recv(i2c, dest, bytes);
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if (ret < 0)
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return ret;
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if (ret != bytes)
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return -EIO;
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return 0;
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}
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/* Currently we allocate the write buffer on the stack; this is OK for
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* small writes - if we need to do large writes this will need to be
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* revised.
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*/
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static int wm8994_i2c_write_device(struct wm8994 *wm8994, unsigned short reg,
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int bytes, void *src)
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{
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struct i2c_client *i2c = wm8994->control_data;
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unsigned char msg[bytes + 2];
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int ret;
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reg = cpu_to_be16(reg);
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memcpy(&msg[0], ®, 2);
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memcpy(&msg[2], src, bytes);
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ret = i2c_master_send(i2c, msg, bytes + 2);
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if (ret < 0)
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return ret;
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if (ret < bytes + 2)
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return -EIO;
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return 0;
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}
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static int wm8994_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct wm8994 *wm8994;
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wm8994 = kzalloc(sizeof(struct wm8994), GFP_KERNEL);
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if (wm8994 == NULL) {
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kfree(i2c);
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return -ENOMEM;
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}
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i2c_set_clientdata(i2c, wm8994);
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wm8994->dev = &i2c->dev;
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wm8994->control_data = i2c;
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wm8994->read_dev = wm8994_i2c_read_device;
|
|
wm8994->write_dev = wm8994_i2c_write_device;
|
|
wm8994->irq = i2c->irq;
|
|
|
|
return wm8994_device_init(wm8994, id->driver_data, i2c->irq);
|
|
}
|
|
|
|
static int wm8994_i2c_remove(struct i2c_client *i2c)
|
|
{
|
|
struct wm8994 *wm8994 = i2c_get_clientdata(i2c);
|
|
|
|
wm8994_device_exit(wm8994);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int wm8994_i2c_suspend(struct i2c_client *i2c, pm_message_t state)
|
|
{
|
|
return wm8994_device_suspend(&i2c->dev);
|
|
}
|
|
|
|
static int wm8994_i2c_resume(struct i2c_client *i2c)
|
|
{
|
|
return wm8994_device_resume(&i2c->dev);
|
|
}
|
|
#else
|
|
#define wm8994_i2c_suspend NULL
|
|
#define wm8994_i2c_resume NULL
|
|
#endif
|
|
|
|
static const struct i2c_device_id wm8994_i2c_id[] = {
|
|
{ "wm8994", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, wm8994_i2c_id);
|
|
|
|
static struct i2c_driver wm8994_i2c_driver = {
|
|
.driver = {
|
|
.name = "wm8994",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = wm8994_i2c_probe,
|
|
.remove = wm8994_i2c_remove,
|
|
.suspend = wm8994_i2c_suspend,
|
|
.resume = wm8994_i2c_resume,
|
|
.id_table = wm8994_i2c_id,
|
|
};
|
|
|
|
static int __init wm8994_i2c_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = i2c_add_driver(&wm8994_i2c_driver);
|
|
if (ret != 0)
|
|
pr_err("Failed to register wm8994 I2C driver: %d\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
module_init(wm8994_i2c_init);
|
|
|
|
static void __exit wm8994_i2c_exit(void)
|
|
{
|
|
i2c_del_driver(&wm8994_i2c_driver);
|
|
}
|
|
module_exit(wm8994_i2c_exit);
|
|
|
|
MODULE_DESCRIPTION("Core support for the WM8994 audio CODEC");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
|