/* * drivers/i2c/chips/menelaus.c * * Copyright (C) 2004 Texas Instruments, Inc. * * Some parts based tps65010.c: * Copyright (C) 2004 Texas Instruments and * Copyright (C) 2004-2005 David Brownell * * Some parts based on tlv320aic24.c: * Copyright (C) by Kai Svahn * * Changes for interrupt handling and clean-up by * Tony Lindgren and Imre Deak * Copyright (C) 2005 Nokia Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * 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. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include #include #include #include #include #define DRIVER_NAME "menelaus" #define pr_err(fmt, arg...) printk(KERN_ERR DRIVER_NAME ": ", ## arg); #define MENELAUS_I2C_ADDRESS 0x72 #define MENELAUS_REV 0x01 #define MENELAUS_VCORE_CTRL1 0x02 #define MENELAUS_VCORE_CTRL2 0x03 #define MENELAUS_VCORE_CTRL3 0x04 #define MENELAUS_VCORE_CTRL4 0x05 #define MENELAUS_VCORE_CTRL5 0x06 #define MENELAUS_DCDC_CTRL1 0x07 #define MENELAUS_DCDC_CTRL2 0x08 #define MENELAUS_DCDC_CTRL3 0x09 #define MENELAUS_LDO_CTRL1 0x0A #define MENELAUS_LDO_CTRL2 0x0B #define MENELAUS_LDO_CTRL3 0x0C #define MENELAUS_LDO_CTRL4 0x0D #define MENELAUS_LDO_CTRL5 0x0E #define MENELAUS_LDO_CTRL6 0x0F #define MENELAUS_LDO_CTRL7 0x10 #define MENELAUS_LDO_CTRL8 0x11 #define MENELAUS_SLEEP_CTRL1 0x12 #define MENELAUS_SLEEP_CTRL2 0x13 #define MENELAUS_DEVICE_OFF 0x14 #define MENELAUS_OSC_CTRL 0x15 #define MENELAUS_DETECT_CTRL 0x16 #define MENELAUS_INT_MASK1 0x17 #define MENELAUS_INT_MASK2 0x18 #define MENELAUS_INT_STATUS1 0x19 #define MENELAUS_INT_STATUS2 0x1A #define MENELAUS_INT_ACK1 0x1B #define MENELAUS_INT_ACK2 0x1C #define MENELAUS_GPIO_CTRL 0x1D #define MENELAUS_GPIO_IN 0x1E #define MENELAUS_GPIO_OUT 0x1F #define MENELAUS_BBSMS 0x20 #define MENELAUS_RTC_CTRL 0x21 #define MENELAUS_RTC_UPDATE 0x22 #define MENELAUS_RTC_SEC 0x23 #define MENELAUS_RTC_MIN 0x24 #define MENELAUS_RTC_HR 0x25 #define MENELAUS_RTC_DAY 0x26 #define MENELAUS_RTC_MON 0x27 #define MENELAUS_RTC_YR 0x28 #define MENELAUS_RTC_WKDAY 0x29 #define MENELAUS_RTC_AL_SEC 0x2A #define MENELAUS_RTC_AL_MIN 0x2B #define MENELAUS_RTC_AL_HR 0x2C #define MENELAUS_RTC_AL_DAY 0x2D #define MENELAUS_RTC_AL_MON 0x2E #define MENELAUS_RTC_AL_YR 0x2F #define MENELAUS_RTC_COMP_MSB 0x30 #define MENELAUS_RTC_COMP_LSB 0x31 #define MENELAUS_S1_PULL_EN 0x32 #define MENELAUS_S1_PULL_DIR 0x33 #define MENELAUS_S2_PULL_EN 0x34 #define MENELAUS_S2_PULL_DIR 0x35 #define MENELAUS_MCT_CTRL1 0x36 #define MENELAUS_MCT_CTRL2 0x37 #define MENELAUS_MCT_CTRL3 0x38 #define MENELAUS_MCT_PIN_ST 0x39 #define MENELAUS_DEBOUNCE1 0x3A #define IH_MENELAUS_IRQS 12 #define MENELAUS_MMC_S1CD_IRQ 0 /* MMC slot 1 card change */ #define MENELAUS_MMC_S2CD_IRQ 1 /* MMC slot 2 card change */ #define MENELAUS_MMC_S1D1_IRQ 2 /* MMC DAT1 low in slot 1 */ #define MENELAUS_MMC_S2D1_IRQ 3 /* MMC DAT1 low in slot 2 */ #define MENELAUS_LOWBAT_IRQ 4 /* Low battery */ #define MENELAUS_HOTDIE_IRQ 5 /* Hot die detect */ #define MENELAUS_UVLO_IRQ 6 /* UVLO detect */ #define MENELAUS_TSHUT_IRQ 7 /* Thermal shutdown */ #define MENELAUS_RTCTMR_IRQ 8 /* RTC timer */ #define MENELAUS_RTCALM_IRQ 9 /* RTC alarm */ #define MENELAUS_RTCERR_IRQ 10 /* RTC error */ #define MENELAUS_PSHBTN_IRQ 11 /* Push button */ #define MENELAUS_RESERVED12_IRQ 12 /* Reserved */ #define MENELAUS_RESERVED13_IRQ 13 /* Reserved */ #define MENELAUS_RESERVED14_IRQ 14 /* Reserved */ #define MENELAUS_RESERVED15_IRQ 15 /* Reserved */ static void menelaus_work(void * _menelaus); /* Initialized by menelaus_init */ static unsigned short normal_i2c[] = { MENELAUS_I2C_ADDRESS, I2C_CLIENT_END }; I2C_CLIENT_INSMOD; struct menelaus_chip { unsigned long initialized; struct semaphore lock; struct i2c_client client; struct work_struct work; int irq; void *handlers[16]; void (*mmc_callback)(unsigned long data, u8 mask); unsigned long mmc_callback_data; }; static struct menelaus_chip menelaus; static void menelaus_write(u8 value, u8 reg) { if (i2c_smbus_write_byte_data(&menelaus.client, reg, value) < 0) pr_err("write error"); } static u8 menelaus_read(u8 reg) { int val = i2c_smbus_read_byte_data(&menelaus.client, reg); if (val < 0) { pr_err("read error"); return 0; } return val; } static void menelaus_enable_irq(int irq) { if (irq > 7) menelaus_write(menelaus_read(MENELAUS_INT_MASK2) & ~(1 << (irq - 8)), MENELAUS_INT_MASK2); else menelaus_write(menelaus_read(MENELAUS_INT_MASK1) & ~(1 << irq), MENELAUS_INT_MASK1); } static void menelaus_disable_irq(int irq) { if (irq > 7) menelaus_write(menelaus_read(MENELAUS_INT_MASK2) | (1 << (irq - 8)), MENELAUS_INT_MASK2); else menelaus_write(menelaus_read(MENELAUS_INT_MASK1) | (1 << irq), MENELAUS_INT_MASK1); } static void menelaus_ack_irq(int irq) { if (irq > 7) menelaus_write(1 << (irq - 8), MENELAUS_INT_ACK2); else menelaus_write(1 << irq, MENELAUS_INT_ACK1); } /* Adds a handler for an interrupt. Does not run in interrupt context */ static int menelaus_add_irq_work(int irq, void * handler) { down(&menelaus.lock); menelaus.handlers[irq] = handler; menelaus_enable_irq(irq); up(&menelaus.lock); return 0; } /* Removes handler for an interrupt */ static void menelaus_remove_irq_work(int irq) { down(&menelaus.lock); menelaus_disable_irq(irq); menelaus.handlers[irq] = NULL; up(&menelaus.lock); } /*-----------------------------------------------------------------------*/ /* * Toggles the MMC slots between open-drain and push-pull mode. * We always set both slots the same way. */ void menelaus_mmc_opendrain(int enable) { unsigned char reg = menelaus_read(MENELAUS_MCT_CTRL1); if (enable) reg |= (0x3 << 2); else reg &= ~(0x3 << 2); menelaus_write(reg, MENELAUS_MCT_CTRL1); } EXPORT_SYMBOL(menelaus_mmc_opendrain); /* * Gets scheduled when a card detect interrupt happens. Note that in some cases * this line is wired to card cover switch rather than the card detect switch * in each slot. In this case the cards are not seen by menelaus. * FIXME: Add handling for D1 too */ static int menelaus_mmc_cd_work(struct menelaus_chip *menelaus) { unsigned char reg; unsigned char card_mask = 0; reg = menelaus_read(MENELAUS_MCT_PIN_ST); if (!(reg & 0x1)) card_mask |= (1 << 0); if (!(reg & 0x2)) card_mask |= (1 << 1); if (menelaus->mmc_callback) menelaus->mmc_callback(menelaus->mmc_callback_data, card_mask); return 0; } /* Initializes MMC slots */ void menelaus_mmc_register(void (*callback)(u8 card_mask), unsigned long data) { int reg; /* DCDC3 to 3V */ reg = menelaus_read(MENELAUS_DCDC_CTRL1); reg |= 0x6 << 4; menelaus_write(reg, MENELAUS_DCDC_CTRL1); reg = menelaus_read(MENELAUS_DCDC_CTRL3); reg |= 0x6; menelaus_write(reg, MENELAUS_DCDC_CTRL3); /* Enable both slots, do not set auto shutdown */ reg = menelaus_read(MENELAUS_MCT_CTRL3); reg |= 0x3; menelaus_write(reg, MENELAUS_MCT_CTRL3); /* Enable card detect for both slots, slot 2 powered from DCDC3 */ reg = menelaus_read(MENELAUS_MCT_CTRL2); reg |= 0xf0; menelaus_write(reg, MENELAUS_MCT_CTRL2); /* Set both slots in open-drain mode, card detect normally closed */ reg = menelaus_read(MENELAUS_MCT_CTRL1); reg |= 0xfc; menelaus_write(reg, MENELAUS_MCT_CTRL1); /* Set MMC voltage */ reg = menelaus_read(MENELAUS_LDO_CTRL7); reg |= 0x03; menelaus_write(reg, MENELAUS_LDO_CTRL7); menelaus.mmc_callback_data = data; menelaus.mmc_callback = callback; menelaus_add_irq_work(MENELAUS_MMC_S1CD_IRQ, menelaus_mmc_cd_work); menelaus_add_irq_work(MENELAUS_MMC_S2CD_IRQ, menelaus_mmc_cd_work); menelaus_add_irq_work(MENELAUS_MMC_S1D1_IRQ, menelaus_mmc_cd_work); menelaus_add_irq_work(MENELAUS_MMC_S2D1_IRQ, menelaus_mmc_cd_work); } EXPORT_SYMBOL(menelaus_mmc_register); void menelaus_mmc_remove(void) { menelaus_remove_irq_work(MENELAUS_MMC_S1CD_IRQ); menelaus_remove_irq_work(MENELAUS_MMC_S2CD_IRQ); menelaus_remove_irq_work(MENELAUS_MMC_S1D1_IRQ); menelaus_remove_irq_work(MENELAUS_MMC_S2D1_IRQ); menelaus.mmc_callback = NULL; menelaus.mmc_callback_data = 0; /* FIXME: Shutdown MMC components of Menelaus */ } EXPORT_SYMBOL(menelaus_mmc_remove); /*-----------------------------------------------------------------------*/ /* Handles Menelaus interrupts. Does not run in interrupt context */ static void menelaus_work(void * _menelaus) { struct menelaus_chip *menelaus = _menelaus; int (*handler)(struct menelaus_chip *menelaus); while (1) { int i; unsigned char isr; isr = menelaus_read(MENELAUS_INT_STATUS1) | (menelaus_read(MENELAUS_INT_STATUS2) << 8); if (!isr) break; for (i = 0; i < IH_MENELAUS_IRQS; i++) { if (isr & (1 << i)) { down(&menelaus->lock); menelaus_disable_irq(i); menelaus_ack_irq(i); if (menelaus->handlers[i]) { handler = menelaus->handlers[i]; handler(menelaus); } menelaus_enable_irq(i); up(&menelaus->lock); } } } enable_irq(menelaus->irq); } /* * We cannot use I2C in interrupt context, so we just schedule work. */ static irqreturn_t menelaus_irq(int irq, void *_menelaus, struct pt_regs *regs) { struct menelaus_chip *menelaus = _menelaus; disable_irq_nosync(irq); (void)schedule_work(&menelaus->work); return IRQ_HANDLED; } static struct i2c_driver menelaus_i2c_driver; static int menelaus_probe(struct i2c_adapter *adapter, int address, int kind) { struct i2c_client *c; int rev = 0; int err = 0, i; if (test_and_set_bit(0, &menelaus.initialized)) return -EBUSY; c = &menelaus.client; strncpy(c->name, DRIVER_NAME, sizeof(c->name)); c->addr = address; c->adapter = adapter; c->driver = &menelaus_i2c_driver; c->flags = 0; if ((err = i2c_attach_client(c)) < 0) { pr_err("couldn't attach\n"); goto fail1; } /* If a true probe check the device */ if (kind < 0 && (rev = menelaus_read(MENELAUS_REV)) < 0) { pr_err("device not found"); err = -ENODEV; goto fail2; } /* Most likely Menelaus interrupt is at SYS_NIRQ */ omap_cfg_reg(W19_24XX_SYS_NIRQ); menelaus.irq = INT_24XX_SYS_NIRQ; /* Disable all menelaus interrupts */ for (i = 0; i < 16; i++) { menelaus_ack_irq(i); menelaus_disable_irq(i); } err = request_irq(menelaus.irq, menelaus_irq, SA_INTERRUPT, DRIVER_NAME, &menelaus); if (err) printk(KERN_ERR "Could not get Menelaus IRQ\n"); init_MUTEX(&menelaus.lock); INIT_WORK(&menelaus.work, menelaus_work, &menelaus); if (kind < 0) pr_info("Menelaus rev %d.%d\n", rev >> 4, rev & 0x0f); return 0; fail2: i2c_detach_client(c); fail1: clear_bit(0, &menelaus.initialized); return err; } static int menelaus_remove(struct i2c_client *client) { int err; free_irq(menelaus.irq, &menelaus); if ((err = i2c_detach_client(client))) { pr_err("client deregistration failed\n"); return err; } clear_bit(0, &menelaus.initialized); return 0; } /*-----------------------------------------------------------------------*/ static int menelaus_scan_bus(struct i2c_adapter *bus) { if (!i2c_check_functionality(bus, I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WRITE_BYTE)) { pr_err("invalid i2c bus functionality\n"); return -EINVAL; } return i2c_probe(bus, &addr_data, menelaus_probe); } static struct i2c_driver menelaus_i2c_driver = { .owner = THIS_MODULE, .name = DRIVER_NAME, .id = I2C_DRIVERID_EXP0, /*FIXME:accroding to i2c-ids.h */ .class = I2C_CLASS_HWMON, .flags = I2C_DF_NOTIFY, .attach_adapter = menelaus_scan_bus, .detach_client = menelaus_remove, }; static int __init menelaus_init(void) { int res; if ((res = i2c_add_driver(&menelaus_i2c_driver)) < 0) { pr_err("driver registration failed\n"); return res; } return 0; } static void __exit menelaus_exit(void) { if (i2c_del_driver(&menelaus_i2c_driver) < 0) pr_err("driver remove failed\n"); /* FIXME: Shutdown menelaus parts that can be shut down */ } MODULE_AUTHOR("Texas Instruments, Inc."); MODULE_DESCRIPTION("I2C interface for Menelaus."); MODULE_LICENSE("GPL"); module_init(menelaus_init); module_exit(menelaus_exit);