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46c20bdfd1
The driver doesn't have a struct of_device_id table but supported devices are registered via Device Trees. This is working on the assumption that a I2C device registered via OF will always match a legacy I2C device ID and that the MODALIAS reported will always be of the form i2c:<device>. But this could change in the future so the correct approach is to have a OF device ID table if the devices are registered via OF. Signed-off-by: Javier Martinez Canillas <javier@dowhile0.org> Acked-by: Rob Herring <robh@kernel.org> Acked-by: Aaro Koskinen <aaro.koskinen@iki.fi> Acked-by: Tony Lindgren <tony@atomide.com> Reviewed-by: Wolfram Sang <wsa@the-dreams.de> Signed-off-by: Lee Jones <lee.jones@linaro.org>
335 lines
7.6 KiB
C
335 lines
7.6 KiB
C
/*
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* Retu/Tahvo MFD driver
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*
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* Copyright (C) 2004, 2005 Nokia Corporation
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*
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* Based on code written by Juha Yrjölä, David Weinehall and Mikko Ylinen.
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* Rewritten by Aaro Koskinen.
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file "COPYING" in the main directory of this
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* archive for more details.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/irq.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/retu.h>
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#include <linux/interrupt.h>
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#include <linux/moduleparam.h>
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/* Registers */
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#define RETU_REG_ASICR 0x00 /* ASIC ID and revision */
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#define RETU_REG_ASICR_VILMA (1 << 7) /* Bit indicating Vilma */
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#define RETU_REG_IDR 0x01 /* Interrupt ID */
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#define RETU_REG_IMR 0x02 /* Interrupt mask (Retu) */
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#define TAHVO_REG_IMR 0x03 /* Interrupt mask (Tahvo) */
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/* Interrupt sources */
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#define RETU_INT_PWR 0 /* Power button */
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struct retu_dev {
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struct regmap *regmap;
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struct device *dev;
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struct mutex mutex;
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struct regmap_irq_chip_data *irq_data;
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};
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static struct resource retu_pwrbutton_res[] = {
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{
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.name = "retu-pwrbutton",
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.start = RETU_INT_PWR,
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.end = RETU_INT_PWR,
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.flags = IORESOURCE_IRQ,
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},
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};
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static const struct mfd_cell retu_devs[] = {
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{
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.name = "retu-wdt"
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},
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{
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.name = "retu-pwrbutton",
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.resources = retu_pwrbutton_res,
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.num_resources = ARRAY_SIZE(retu_pwrbutton_res),
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}
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};
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static struct regmap_irq retu_irqs[] = {
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[RETU_INT_PWR] = {
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.mask = 1 << RETU_INT_PWR,
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}
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};
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static struct regmap_irq_chip retu_irq_chip = {
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.name = "RETU",
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.irqs = retu_irqs,
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.num_irqs = ARRAY_SIZE(retu_irqs),
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.num_regs = 1,
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.status_base = RETU_REG_IDR,
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.mask_base = RETU_REG_IMR,
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.ack_base = RETU_REG_IDR,
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};
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/* Retu device registered for the power off. */
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static struct retu_dev *retu_pm_power_off;
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static struct resource tahvo_usb_res[] = {
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{
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.name = "tahvo-usb",
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.start = TAHVO_INT_VBUS,
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.end = TAHVO_INT_VBUS,
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.flags = IORESOURCE_IRQ,
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},
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};
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static const struct mfd_cell tahvo_devs[] = {
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{
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.name = "tahvo-usb",
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.resources = tahvo_usb_res,
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.num_resources = ARRAY_SIZE(tahvo_usb_res),
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},
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};
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static struct regmap_irq tahvo_irqs[] = {
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[TAHVO_INT_VBUS] = {
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.mask = 1 << TAHVO_INT_VBUS,
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}
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};
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static struct regmap_irq_chip tahvo_irq_chip = {
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.name = "TAHVO",
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.irqs = tahvo_irqs,
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.num_irqs = ARRAY_SIZE(tahvo_irqs),
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.num_regs = 1,
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.status_base = RETU_REG_IDR,
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.mask_base = TAHVO_REG_IMR,
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.ack_base = RETU_REG_IDR,
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};
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static const struct retu_data {
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char *chip_name;
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char *companion_name;
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struct regmap_irq_chip *irq_chip;
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const struct mfd_cell *children;
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int nchildren;
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} retu_data[] = {
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[0] = {
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.chip_name = "Retu",
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.companion_name = "Vilma",
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.irq_chip = &retu_irq_chip,
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.children = retu_devs,
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.nchildren = ARRAY_SIZE(retu_devs),
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},
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[1] = {
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.chip_name = "Tahvo",
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.companion_name = "Betty",
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.irq_chip = &tahvo_irq_chip,
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.children = tahvo_devs,
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.nchildren = ARRAY_SIZE(tahvo_devs),
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}
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};
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int retu_read(struct retu_dev *rdev, u8 reg)
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{
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int ret;
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int value;
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mutex_lock(&rdev->mutex);
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ret = regmap_read(rdev->regmap, reg, &value);
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mutex_unlock(&rdev->mutex);
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return ret ? ret : value;
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}
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EXPORT_SYMBOL_GPL(retu_read);
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int retu_write(struct retu_dev *rdev, u8 reg, u16 data)
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{
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int ret;
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mutex_lock(&rdev->mutex);
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ret = regmap_write(rdev->regmap, reg, data);
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mutex_unlock(&rdev->mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(retu_write);
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static void retu_power_off(void)
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{
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struct retu_dev *rdev = retu_pm_power_off;
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int reg;
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mutex_lock(&retu_pm_power_off->mutex);
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/* Ignore power button state */
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regmap_read(rdev->regmap, RETU_REG_CC1, ®);
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regmap_write(rdev->regmap, RETU_REG_CC1, reg | 2);
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/* Expire watchdog immediately */
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regmap_write(rdev->regmap, RETU_REG_WATCHDOG, 0);
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/* Wait for poweroff */
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for (;;)
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cpu_relax();
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mutex_unlock(&retu_pm_power_off->mutex);
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}
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static int retu_regmap_read(void *context, const void *reg, size_t reg_size,
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void *val, size_t val_size)
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{
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int ret;
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struct device *dev = context;
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struct i2c_client *i2c = to_i2c_client(dev);
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BUG_ON(reg_size != 1 || val_size != 2);
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ret = i2c_smbus_read_word_data(i2c, *(u8 const *)reg);
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if (ret < 0)
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return ret;
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*(u16 *)val = ret;
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return 0;
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}
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static int retu_regmap_write(void *context, const void *data, size_t count)
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{
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u8 reg;
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u16 val;
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struct device *dev = context;
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struct i2c_client *i2c = to_i2c_client(dev);
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BUG_ON(count != sizeof(reg) + sizeof(val));
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memcpy(®, data, sizeof(reg));
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memcpy(&val, data + sizeof(reg), sizeof(val));
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return i2c_smbus_write_word_data(i2c, reg, val);
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}
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static struct regmap_bus retu_bus = {
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.read = retu_regmap_read,
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.write = retu_regmap_write,
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.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
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};
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static const struct regmap_config retu_config = {
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.reg_bits = 8,
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.val_bits = 16,
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};
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static int retu_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
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{
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struct retu_data const *rdat;
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struct retu_dev *rdev;
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int ret;
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if (i2c->addr > ARRAY_SIZE(retu_data))
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return -ENODEV;
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rdat = &retu_data[i2c->addr - 1];
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rdev = devm_kzalloc(&i2c->dev, sizeof(*rdev), GFP_KERNEL);
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if (rdev == NULL)
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return -ENOMEM;
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i2c_set_clientdata(i2c, rdev);
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rdev->dev = &i2c->dev;
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mutex_init(&rdev->mutex);
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rdev->regmap = devm_regmap_init(&i2c->dev, &retu_bus, &i2c->dev,
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&retu_config);
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if (IS_ERR(rdev->regmap))
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return PTR_ERR(rdev->regmap);
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ret = retu_read(rdev, RETU_REG_ASICR);
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if (ret < 0) {
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dev_err(rdev->dev, "could not read %s revision: %d\n",
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rdat->chip_name, ret);
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return ret;
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}
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dev_info(rdev->dev, "%s%s%s v%d.%d found\n", rdat->chip_name,
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(ret & RETU_REG_ASICR_VILMA) ? " & " : "",
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(ret & RETU_REG_ASICR_VILMA) ? rdat->companion_name : "",
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(ret >> 4) & 0x7, ret & 0xf);
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/* Mask all interrupts. */
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ret = retu_write(rdev, rdat->irq_chip->mask_base, 0xffff);
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if (ret < 0)
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return ret;
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ret = regmap_add_irq_chip(rdev->regmap, i2c->irq, IRQF_ONESHOT, -1,
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rdat->irq_chip, &rdev->irq_data);
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if (ret < 0)
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return ret;
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ret = mfd_add_devices(rdev->dev, -1, rdat->children, rdat->nchildren,
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NULL, regmap_irq_chip_get_base(rdev->irq_data),
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NULL);
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if (ret < 0) {
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regmap_del_irq_chip(i2c->irq, rdev->irq_data);
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return ret;
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}
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if (i2c->addr == 1 && !pm_power_off) {
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retu_pm_power_off = rdev;
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pm_power_off = retu_power_off;
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}
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return 0;
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}
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static int retu_remove(struct i2c_client *i2c)
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{
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struct retu_dev *rdev = i2c_get_clientdata(i2c);
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if (retu_pm_power_off == rdev) {
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pm_power_off = NULL;
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retu_pm_power_off = NULL;
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}
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mfd_remove_devices(rdev->dev);
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regmap_del_irq_chip(i2c->irq, rdev->irq_data);
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return 0;
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}
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static const struct i2c_device_id retu_id[] = {
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{ "retu", 0 },
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{ "tahvo", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, retu_id);
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static const struct of_device_id retu_of_match[] = {
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{ .compatible = "nokia,retu" },
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{ .compatible = "nokia,tahvo" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, retu_of_match);
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static struct i2c_driver retu_driver = {
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.driver = {
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.name = "retu-mfd",
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.of_match_table = retu_of_match,
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},
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.probe = retu_probe,
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.remove = retu_remove,
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.id_table = retu_id,
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};
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module_i2c_driver(retu_driver);
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MODULE_DESCRIPTION("Retu MFD driver");
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MODULE_AUTHOR("Juha Yrjölä");
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MODULE_AUTHOR("David Weinehall");
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MODULE_AUTHOR("Mikko Ylinen");
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MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
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MODULE_LICENSE("GPL");
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