--- /dev/null
+/*
+ * 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 <kai.svahn@nokia.com>
+ *
+ * Changes for interrupt handling and clean-up by
+ * Tony Lindgren <tony@atomide.com> and Imre Deak <imre.deak@nokia.com>
+ * 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 <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+
+#include <asm/mach-types.h>
+#include <asm/mach/irq.h>
+
+#include <asm/arch/mux.h>
+#include <asm/arch/gpio.h>
+#include <asm/arch/menelaus.h>
+
+#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);
projects / linux-2.6-omap-h63xx.git / commitdiff