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