457 lines
10 KiB
C
457 lines
10 KiB
C
/*
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* wm8350-core.c -- Device access for Wolfson WM8350
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*
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* Copyright 2007, 2008 Wolfson Microelectronics PLC.
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*
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* Author: Liam Girdwood, Mark Brown
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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/init.h>
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#include <linux/device.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/wm8350/core.h>
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#include <linux/mfd/wm8350/audio.h>
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#include <linux/mfd/wm8350/gpio.h>
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#include <linux/mfd/wm8350/pmic.h>
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#include <linux/mfd/wm8350/supply.h>
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#define WM8350_UNLOCK_KEY 0x0013
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#define WM8350_LOCK_KEY 0x0000
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#define WM8350_CLOCK_CONTROL_1 0x28
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#define WM8350_AIF_TEST 0x74
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/* debug */
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#define WM8350_BUS_DEBUG 0
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#if WM8350_BUS_DEBUG
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#define dump(regs, src) do { \
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int i_; \
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u16 *src_ = src; \
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printk(KERN_DEBUG); \
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for (i_ = 0; i_ < regs; i_++) \
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printk(" 0x%4.4x", *src_++); \
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printk("\n"); \
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} while (0);
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#else
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#define dump(bytes, src)
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#endif
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#define WM8350_LOCK_DEBUG 0
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#if WM8350_LOCK_DEBUG
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#define ldbg(format, arg...) printk(format, ## arg)
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#else
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#define ldbg(format, arg...)
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#endif
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/*
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* WM8350 Device IO
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*/
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static DEFINE_MUTEX(io_mutex);
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static DEFINE_MUTEX(reg_lock_mutex);
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static DEFINE_MUTEX(auxadc_mutex);
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/* Perform a physical read from the device.
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*/
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static int wm8350_phys_read(struct wm8350 *wm8350, u8 reg, int num_regs,
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u16 *dest)
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{
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int i, ret;
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int bytes = num_regs * 2;
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dev_dbg(wm8350->dev, "volatile read\n");
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ret = wm8350->read_dev(wm8350, reg, bytes, (char *)dest);
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for (i = reg; i < reg + num_regs; i++) {
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/* Cache is CPU endian */
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dest[i - reg] = be16_to_cpu(dest[i - reg]);
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/* Satisfy non-volatile bits from cache */
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dest[i - reg] &= wm8350_reg_io_map[i].vol;
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dest[i - reg] |= wm8350->reg_cache[i];
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/* Mask out non-readable bits */
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dest[i - reg] &= wm8350_reg_io_map[i].readable;
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}
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dump(num_regs, dest);
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return ret;
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}
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static int wm8350_read(struct wm8350 *wm8350, u8 reg, int num_regs, u16 *dest)
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{
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int i;
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int end = reg + num_regs;
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int ret = 0;
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int bytes = num_regs * 2;
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if (wm8350->read_dev == NULL)
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return -ENODEV;
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if ((reg + num_regs - 1) > WM8350_MAX_REGISTER) {
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dev_err(wm8350->dev, "invalid reg %x\n",
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reg + num_regs - 1);
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return -EINVAL;
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}
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dev_dbg(wm8350->dev,
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"%s R%d(0x%2.2x) %d regs\n", __func__, reg, reg, num_regs);
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#if WM8350_BUS_DEBUG
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/* we can _safely_ read any register, but warn if read not supported */
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for (i = reg; i < end; i++) {
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if (!wm8350_reg_io_map[i].readable)
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dev_warn(wm8350->dev,
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"reg R%d is not readable\n", i);
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}
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#endif
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/* if any volatile registers are required, then read back all */
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for (i = reg; i < end; i++)
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if (wm8350_reg_io_map[i].vol)
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return wm8350_phys_read(wm8350, reg, num_regs, dest);
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/* no volatiles, then cache is good */
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dev_dbg(wm8350->dev, "cache read\n");
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memcpy(dest, &wm8350->reg_cache[reg], bytes);
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dump(num_regs, dest);
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return ret;
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}
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static inline int is_reg_locked(struct wm8350 *wm8350, u8 reg)
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{
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if (reg == WM8350_SECURITY ||
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wm8350->reg_cache[WM8350_SECURITY] == WM8350_UNLOCK_KEY)
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return 0;
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if ((reg == WM8350_GPIO_CONFIGURATION_I_O) ||
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(reg >= WM8350_GPIO_FUNCTION_SELECT_1 &&
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reg <= WM8350_GPIO_FUNCTION_SELECT_4) ||
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(reg >= WM8350_BATTERY_CHARGER_CONTROL_1 &&
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reg <= WM8350_BATTERY_CHARGER_CONTROL_3))
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return 1;
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return 0;
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}
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static int wm8350_write(struct wm8350 *wm8350, u8 reg, int num_regs, u16 *src)
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{
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int i;
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int end = reg + num_regs;
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int bytes = num_regs * 2;
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if (wm8350->write_dev == NULL)
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return -ENODEV;
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if ((reg + num_regs - 1) > WM8350_MAX_REGISTER) {
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dev_err(wm8350->dev, "invalid reg %x\n",
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reg + num_regs - 1);
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return -EINVAL;
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}
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/* it's generally not a good idea to write to RO or locked registers */
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for (i = reg; i < end; i++) {
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if (!wm8350_reg_io_map[i].writable) {
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dev_err(wm8350->dev,
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"attempted write to read only reg R%d\n", i);
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return -EINVAL;
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}
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if (is_reg_locked(wm8350, i)) {
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dev_err(wm8350->dev,
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"attempted write to locked reg R%d\n", i);
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return -EINVAL;
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}
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src[i - reg] &= wm8350_reg_io_map[i].writable;
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wm8350->reg_cache[i] =
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(wm8350->reg_cache[i] & ~wm8350_reg_io_map[i].writable)
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| src[i - reg];
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src[i - reg] = cpu_to_be16(src[i - reg]);
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}
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/* Actually write it out */
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return wm8350->write_dev(wm8350, reg, bytes, (char *)src);
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}
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/*
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* Safe read, modify, write methods
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*/
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int wm8350_clear_bits(struct wm8350 *wm8350, u16 reg, u16 mask)
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{
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u16 data;
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int err;
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mutex_lock(&io_mutex);
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err = wm8350_read(wm8350, reg, 1, &data);
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if (err) {
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dev_err(wm8350->dev, "read from reg R%d failed\n", reg);
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goto out;
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}
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data &= ~mask;
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err = wm8350_write(wm8350, reg, 1, &data);
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if (err)
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dev_err(wm8350->dev, "write to reg R%d failed\n", reg);
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out:
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mutex_unlock(&io_mutex);
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return err;
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}
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EXPORT_SYMBOL_GPL(wm8350_clear_bits);
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int wm8350_set_bits(struct wm8350 *wm8350, u16 reg, u16 mask)
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{
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u16 data;
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int err;
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mutex_lock(&io_mutex);
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err = wm8350_read(wm8350, reg, 1, &data);
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if (err) {
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dev_err(wm8350->dev, "read from reg R%d failed\n", reg);
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goto out;
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}
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data |= mask;
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err = wm8350_write(wm8350, reg, 1, &data);
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if (err)
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dev_err(wm8350->dev, "write to reg R%d failed\n", reg);
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out:
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mutex_unlock(&io_mutex);
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return err;
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}
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EXPORT_SYMBOL_GPL(wm8350_set_bits);
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u16 wm8350_reg_read(struct wm8350 *wm8350, int reg)
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{
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u16 data;
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int err;
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mutex_lock(&io_mutex);
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err = wm8350_read(wm8350, reg, 1, &data);
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if (err)
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dev_err(wm8350->dev, "read from reg R%d failed\n", reg);
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mutex_unlock(&io_mutex);
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return data;
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}
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EXPORT_SYMBOL_GPL(wm8350_reg_read);
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int wm8350_reg_write(struct wm8350 *wm8350, int reg, u16 val)
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{
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int ret;
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u16 data = val;
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mutex_lock(&io_mutex);
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ret = wm8350_write(wm8350, reg, 1, &data);
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if (ret)
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dev_err(wm8350->dev, "write to reg R%d failed\n", reg);
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mutex_unlock(&io_mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(wm8350_reg_write);
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int wm8350_block_read(struct wm8350 *wm8350, int start_reg, int regs,
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u16 *dest)
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{
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int err = 0;
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mutex_lock(&io_mutex);
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err = wm8350_read(wm8350, start_reg, regs, dest);
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if (err)
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dev_err(wm8350->dev, "block read starting from R%d failed\n",
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start_reg);
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mutex_unlock(&io_mutex);
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return err;
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}
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EXPORT_SYMBOL_GPL(wm8350_block_read);
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int wm8350_block_write(struct wm8350 *wm8350, int start_reg, int regs,
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u16 *src)
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{
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int ret = 0;
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mutex_lock(&io_mutex);
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ret = wm8350_write(wm8350, start_reg, regs, src);
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if (ret)
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dev_err(wm8350->dev, "block write starting at R%d failed\n",
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start_reg);
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mutex_unlock(&io_mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(wm8350_block_write);
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int wm8350_reg_lock(struct wm8350 *wm8350)
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{
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u16 key = WM8350_LOCK_KEY;
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int ret;
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ldbg(__func__);
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mutex_lock(&io_mutex);
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ret = wm8350_write(wm8350, WM8350_SECURITY, 1, &key);
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if (ret)
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dev_err(wm8350->dev, "lock failed\n");
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mutex_unlock(&io_mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(wm8350_reg_lock);
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int wm8350_reg_unlock(struct wm8350 *wm8350)
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{
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u16 key = WM8350_UNLOCK_KEY;
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int ret;
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ldbg(__func__);
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mutex_lock(&io_mutex);
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ret = wm8350_write(wm8350, WM8350_SECURITY, 1, &key);
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if (ret)
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dev_err(wm8350->dev, "unlock failed\n");
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mutex_unlock(&io_mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(wm8350_reg_unlock);
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/*
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* Cache is always host endian.
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*/
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static int wm8350_create_cache(struct wm8350 *wm8350, int mode)
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{
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int i, ret = 0;
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u16 value;
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const u16 *reg_map;
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switch (mode) {
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#ifdef CONFIG_MFD_WM8350_CONFIG_MODE_0
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case 0:
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reg_map = wm8350_mode0_defaults;
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break;
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#endif
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#ifdef CONFIG_MFD_WM8350_CONFIG_MODE_1
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case 1:
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reg_map = wm8350_mode1_defaults;
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break;
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#endif
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#ifdef CONFIG_MFD_WM8350_CONFIG_MODE_2
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case 2:
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reg_map = wm8350_mode2_defaults;
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break;
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#endif
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#ifdef CONFIG_MFD_WM8350_CONFIG_MODE_3
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case 3:
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reg_map = wm8350_mode3_defaults;
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break;
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#endif
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default:
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dev_err(wm8350->dev, "Configuration mode %d not supported\n",
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mode);
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return -EINVAL;
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}
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wm8350->reg_cache =
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kzalloc(sizeof(u16) * (WM8350_MAX_REGISTER + 1), GFP_KERNEL);
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if (wm8350->reg_cache == NULL)
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return -ENOMEM;
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/* Read the initial cache state back from the device - this is
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* a PMIC so the device many not be in a virgin state and we
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* can't rely on the silicon values.
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*/
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for (i = 0; i < WM8350_MAX_REGISTER; i++) {
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/* audio register range */
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if (wm8350_reg_io_map[i].readable &&
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(i < WM8350_CLOCK_CONTROL_1 || i > WM8350_AIF_TEST)) {
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ret = wm8350->read_dev(wm8350, i, 2, (char *)&value);
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if (ret < 0) {
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dev_err(wm8350->dev,
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"failed to read initial cache value\n");
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goto out;
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}
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value = be16_to_cpu(value);
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value &= wm8350_reg_io_map[i].readable;
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wm8350->reg_cache[i] = value;
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} else
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wm8350->reg_cache[i] = reg_map[i];
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}
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out:
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return ret;
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}
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EXPORT_SYMBOL_GPL(wm8350_create_cache);
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int wm8350_device_init(struct wm8350 *wm8350)
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{
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int ret = -EINVAL;
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u16 id1, id2, mask, mode;
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/* get WM8350 revision and config mode */
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wm8350->read_dev(wm8350, WM8350_RESET_ID, sizeof(id1), &id1);
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wm8350->read_dev(wm8350, WM8350_ID, sizeof(id2), &id2);
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id1 = be16_to_cpu(id1);
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id2 = be16_to_cpu(id2);
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if (id1 == 0x0)
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dev_info(wm8350->dev, "Found Rev C device\n");
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else if (id1 == 0x6143) {
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switch ((id2 & WM8350_CHIP_REV_MASK) >> 12) {
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case WM8350_REV_E:
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dev_info(wm8350->dev, "Found Rev E device\n");
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wm8350->rev = WM8350_REV_E;
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break;
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case WM8350_REV_F:
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dev_info(wm8350->dev, "Found Rev F device\n");
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wm8350->rev = WM8350_REV_F;
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break;
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case WM8350_REV_G:
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dev_info(wm8350->dev, "Found Rev G device\n");
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wm8350->rev = WM8350_REV_G;
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break;
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default:
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/* For safety we refuse to run on unknown hardware */
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dev_info(wm8350->dev, "Found unknown rev\n");
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ret = -ENODEV;
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goto err;
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}
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} else {
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dev_info(wm8350->dev, "Device with ID %x is not a WM8350\n",
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id1);
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ret = -ENODEV;
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goto err;
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}
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mode = id2 & WM8350_CONF_STS_MASK >> 10;
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mask = id2 & WM8350_CUST_ID_MASK;
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dev_info(wm8350->dev, "Config mode %d, ROM mask %d\n", mode, mask);
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ret = wm8350_create_cache(wm8350, mode);
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if (ret < 0) {
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printk(KERN_ERR "wm8350: failed to create register cache\n");
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return ret;
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}
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return 0;
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err:
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kfree(wm8350->reg_cache);
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return ret;
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}
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EXPORT_SYMBOL_GPL(wm8350_device_init);
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void wm8350_device_exit(struct wm8350 *wm8350)
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{
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kfree(wm8350->reg_cache);
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}
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EXPORT_SYMBOL_GPL(wm8350_device_exit);
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MODULE_LICENSE("GPL");
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