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334 lines
7.6 KiB
334 lines
7.6 KiB
/* |
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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 const 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 const 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 <[email protected]>"); |
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MODULE_LICENSE("GPL");
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