blk-mq: move cancel of requeue_work into blk_mq_release

[mirror_ubuntu-bionic-kernel.git] / drivers / input / keyboard / adp5588-keys.c

/*
 * File: drivers/input/keyboard/adp5588_keys.c
 * Description:  keypad driver for ADP5588 and ADP5587
 *               I2C QWERTY Keypad and IO Expander
 * Bugs: Enter bugs at http://blackfin.uclinux.org/
 *
 * Copyright (C) 2008-2010 Analog Devices Inc.
 * Licensed under the GPL-2 or later.
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/workqueue.h>
#include <linux/errno.h>
#include <linux/pm.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/slab.h>

#include <linux/platform_data/adp5588.h>

/* Key Event Register xy */
#define KEY_EV_PRESSED          (1 << 7)
#define KEY_EV_MASK             (0x7F)

#define KP_SEL(x)               (0xFFFF >> (16 - x))    /* 2^x-1 */

#define KEYP_MAX_EVENT          10

/*
 * Early pre 4.0 Silicon required to delay readout by at least 25ms,
 * since the Event Counter Register updated 25ms after the interrupt
 * asserted.
 */
#define WA_DELAYED_READOUT_REVID(rev)           ((rev) < 4)

struct adp5588_kpad {
        struct i2c_client *client;
        struct input_dev *input;
        struct delayed_work work;
        unsigned long delay;
        unsigned short keycode[ADP5588_KEYMAPSIZE];
        const struct adp5588_gpi_map *gpimap;
        unsigned short gpimapsize;
#ifdef CONFIG_GPIOLIB
        unsigned char gpiomap[ADP5588_MAXGPIO];
        bool export_gpio;
        struct gpio_chip gc;
        struct mutex gpio_lock; /* Protect cached dir, dat_out */
        u8 dat_out[3];
        u8 dir[3];
#endif
};

static int adp5588_read(struct i2c_client *client, u8 reg)
{
        int ret = i2c_smbus_read_byte_data(client, reg);

        if (ret < 0)
                dev_err(&client->dev, "Read Error\n");

        return ret;
}

static int adp5588_write(struct i2c_client *client, u8 reg, u8 val)
{
        return i2c_smbus_write_byte_data(client, reg, val);
}

#ifdef CONFIG_GPIOLIB
static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off)
{
        struct adp5588_kpad *kpad = gpiochip_get_data(chip);
        unsigned int bank = ADP5588_BANK(kpad->gpiomap[off]);
        unsigned int bit = ADP5588_BIT(kpad->gpiomap[off]);
        int val;

        mutex_lock(&kpad->gpio_lock);

        if (kpad->dir[bank] & bit)
                val = kpad->dat_out[bank];
        else
                val = adp5588_read(kpad->client, GPIO_DAT_STAT1 + bank);

        mutex_unlock(&kpad->gpio_lock);

        return !!(val & bit);
}

static void adp5588_gpio_set_value(struct gpio_chip *chip,
                                   unsigned off, int val)
{
        struct adp5588_kpad *kpad = gpiochip_get_data(chip);
        unsigned int bank = ADP5588_BANK(kpad->gpiomap[off]);
        unsigned int bit = ADP5588_BIT(kpad->gpiomap[off]);

        mutex_lock(&kpad->gpio_lock);

        if (val)
                kpad->dat_out[bank] |= bit;
        else
                kpad->dat_out[bank] &= ~bit;

        adp5588_write(kpad->client, GPIO_DAT_OUT1 + bank,
                           kpad->dat_out[bank]);

        mutex_unlock(&kpad->gpio_lock);
}

static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off)
{
        struct adp5588_kpad *kpad = gpiochip_get_data(chip);
        unsigned int bank = ADP5588_BANK(kpad->gpiomap[off]);
        unsigned int bit = ADP5588_BIT(kpad->gpiomap[off]);
        int ret;

        mutex_lock(&kpad->gpio_lock);

        kpad->dir[bank] &= ~bit;
        ret = adp5588_write(kpad->client, GPIO_DIR1 + bank, kpad->dir[bank]);

        mutex_unlock(&kpad->gpio_lock);

        return ret;
}

static int adp5588_gpio_direction_output(struct gpio_chip *chip,
                                         unsigned off, int val)
{
        struct adp5588_kpad *kpad = gpiochip_get_data(chip);
        unsigned int bank = ADP5588_BANK(kpad->gpiomap[off]);
        unsigned int bit = ADP5588_BIT(kpad->gpiomap[off]);
        int ret;

        mutex_lock(&kpad->gpio_lock);

        kpad->dir[bank] |= bit;

        if (val)
                kpad->dat_out[bank] |= bit;
        else
                kpad->dat_out[bank] &= ~bit;

        ret = adp5588_write(kpad->client, GPIO_DAT_OUT1 + bank,
                                 kpad->dat_out[bank]);
        ret |= adp5588_write(kpad->client, GPIO_DIR1 + bank,
                                 kpad->dir[bank]);

        mutex_unlock(&kpad->gpio_lock);

        return ret;
}

static int adp5588_build_gpiomap(struct adp5588_kpad *kpad,
                                const struct adp5588_kpad_platform_data *pdata)
{
        bool pin_used[ADP5588_MAXGPIO];
        int n_unused = 0;
        int i;

        memset(pin_used, 0, sizeof(pin_used));

        for (i = 0; i < pdata->rows; i++)
                pin_used[i] = true;

        for (i = 0; i < pdata->cols; i++)
                pin_used[i + GPI_PIN_COL_BASE - GPI_PIN_BASE] = true;

        for (i = 0; i < kpad->gpimapsize; i++)
                pin_used[kpad->gpimap[i].pin - GPI_PIN_BASE] = true;

        for (i = 0; i < ADP5588_MAXGPIO; i++)
                if (!pin_used[i])
                        kpad->gpiomap[n_unused++] = i;

        return n_unused;
}

static int adp5588_gpio_add(struct adp5588_kpad *kpad)
{
        struct device *dev = &kpad->client->dev;
        const struct adp5588_kpad_platform_data *pdata = dev_get_platdata(dev);
        const struct adp5588_gpio_platform_data *gpio_data = pdata->gpio_data;
        int i, error;

        if (!gpio_data)
                return 0;

        kpad->gc.ngpio = adp5588_build_gpiomap(kpad, pdata);
        if (kpad->gc.ngpio == 0) {
                dev_info(dev, "No unused gpios left to export\n");
                return 0;
        }

        kpad->export_gpio = true;

        kpad->gc.direction_input = adp5588_gpio_direction_input;
        kpad->gc.direction_output = adp5588_gpio_direction_output;
        kpad->gc.get = adp5588_gpio_get_value;
        kpad->gc.set = adp5588_gpio_set_value;
        kpad->gc.can_sleep = 1;

        kpad->gc.base = gpio_data->gpio_start;
        kpad->gc.label = kpad->client->name;
        kpad->gc.owner = THIS_MODULE;
        kpad->gc.names = gpio_data->names;

        mutex_init(&kpad->gpio_lock);

        error = gpiochip_add_data(&kpad->gc, kpad);
        if (error) {
                dev_err(dev, "gpiochip_add failed, err: %d\n", error);
                return error;
        }

        for (i = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
                kpad->dat_out[i] = adp5588_read(kpad->client,
                                                GPIO_DAT_OUT1 + i);
                kpad->dir[i] = adp5588_read(kpad->client, GPIO_DIR1 + i);
        }

        if (gpio_data->setup) {
                error = gpio_data->setup(kpad->client,
                                         kpad->gc.base, kpad->gc.ngpio,
                                         gpio_data->context);
                if (error)
                        dev_warn(dev, "setup failed, %d\n", error);
        }

        return 0;
}

static void adp5588_gpio_remove(struct adp5588_kpad *kpad)
{
        struct device *dev = &kpad->client->dev;
        const struct adp5588_kpad_platform_data *pdata = dev_get_platdata(dev);
        const struct adp5588_gpio_platform_data *gpio_data = pdata->gpio_data;
        int error;

        if (!kpad->export_gpio)
                return;

        if (gpio_data->teardown) {
                error = gpio_data->teardown(kpad->client,
                                            kpad->gc.base, kpad->gc.ngpio,
                                            gpio_data->context);
                if (error)
                        dev_warn(dev, "teardown failed %d\n", error);
        }

        gpiochip_remove(&kpad->gc);
}
#else
static inline int adp5588_gpio_add(struct adp5588_kpad *kpad)
{
        return 0;
}

static inline void adp5588_gpio_remove(struct adp5588_kpad *kpad)
{
}
#endif

static void adp5588_report_events(struct adp5588_kpad *kpad, int ev_cnt)
{
        int i, j;

        for (i = 0; i < ev_cnt; i++) {
                int key = adp5588_read(kpad->client, Key_EVENTA + i);
                int key_val = key & KEY_EV_MASK;

                if (key_val >= GPI_PIN_BASE && key_val <= GPI_PIN_END) {
                        for (j = 0; j < kpad->gpimapsize; j++) {
                                if (key_val == kpad->gpimap[j].pin) {
                                        input_report_switch(kpad->input,
                                                        kpad->gpimap[j].sw_evt,
                                                        key & KEY_EV_PRESSED);
                                        break;
                                }
                        }
                } else {
                        input_report_key(kpad->input,
                                         kpad->keycode[key_val - 1],
                                         key & KEY_EV_PRESSED);
                }
        }
}

static void adp5588_work(struct work_struct *work)
{
        struct adp5588_kpad *kpad = container_of(work,
                                                struct adp5588_kpad, work.work);
        struct i2c_client *client = kpad->client;
        int status, ev_cnt;

        status = adp5588_read(client, INT_STAT);

        if (status & ADP5588_OVR_FLOW_INT)      /* Unlikely and should never happen */
                dev_err(&client->dev, "Event Overflow Error\n");

        if (status & ADP5588_KE_INT) {
                ev_cnt = adp5588_read(client, KEY_LCK_EC_STAT) & ADP5588_KEC;
                if (ev_cnt) {
                        adp5588_report_events(kpad, ev_cnt);
                        input_sync(kpad->input);
                }
        }
        adp5588_write(client, INT_STAT, status); /* Status is W1C */
}

static irqreturn_t adp5588_irq(int irq, void *handle)
{
        struct adp5588_kpad *kpad = handle;

        /*
         * use keventd context to read the event fifo registers
         * Schedule readout at least 25ms after notification for
         * REVID < 4
         */

        schedule_delayed_work(&kpad->work, kpad->delay);

        return IRQ_HANDLED;
}

static int adp5588_setup(struct i2c_client *client)
{
        const struct adp5588_kpad_platform_data *pdata =
                        dev_get_platdata(&client->dev);
        const struct adp5588_gpio_platform_data *gpio_data = pdata->gpio_data;
        int i, ret;
        unsigned char evt_mode1 = 0, evt_mode2 = 0, evt_mode3 = 0;

        ret = adp5588_write(client, KP_GPIO1, KP_SEL(pdata->rows));
        ret |= adp5588_write(client, KP_GPIO2, KP_SEL(pdata->cols) & 0xFF);
        ret |= adp5588_write(client, KP_GPIO3, KP_SEL(pdata->cols) >> 8);

        if (pdata->en_keylock) {
                ret |= adp5588_write(client, UNLOCK1, pdata->unlock_key1);
                ret |= adp5588_write(client, UNLOCK2, pdata->unlock_key2);
                ret |= adp5588_write(client, KEY_LCK_EC_STAT, ADP5588_K_LCK_EN);
        }

        for (i = 0; i < KEYP_MAX_EVENT; i++)
                ret |= adp5588_read(client, Key_EVENTA);

        for (i = 0; i < pdata->gpimapsize; i++) {
                unsigned short pin = pdata->gpimap[i].pin;

                if (pin <= GPI_PIN_ROW_END) {
                        evt_mode1 |= (1 << (pin - GPI_PIN_ROW_BASE));
                } else {
                        evt_mode2 |= ((1 << (pin - GPI_PIN_COL_BASE)) & 0xFF);
                        evt_mode3 |= ((1 << (pin - GPI_PIN_COL_BASE)) >> 8);
                }
        }

        if (pdata->gpimapsize) {
                ret |= adp5588_write(client, GPI_EM1, evt_mode1);
                ret |= adp5588_write(client, GPI_EM2, evt_mode2);
                ret |= adp5588_write(client, GPI_EM3, evt_mode3);
        }

        if (gpio_data) {
                for (i = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
                        int pull_mask = gpio_data->pullup_dis_mask;

                        ret |= adp5588_write(client, GPIO_PULL1 + i,
                                (pull_mask >> (8 * i)) & 0xFF);
                }
        }

        ret |= adp5588_write(client, INT_STAT,
                                ADP5588_CMP2_INT | ADP5588_CMP1_INT |
                                ADP5588_OVR_FLOW_INT | ADP5588_K_LCK_INT |
                                ADP5588_GPI_INT | ADP5588_KE_INT); /* Status is W1C */

        ret |= adp5588_write(client, CFG, ADP5588_INT_CFG |
                                          ADP5588_OVR_FLOW_IEN |
                                          ADP5588_KE_IEN);

        if (ret < 0) {
                dev_err(&client->dev, "Write Error\n");
                return ret;
        }

        return 0;
}

static void adp5588_report_switch_state(struct adp5588_kpad *kpad)
{
        int gpi_stat1 = adp5588_read(kpad->client, GPIO_DAT_STAT1);
        int gpi_stat2 = adp5588_read(kpad->client, GPIO_DAT_STAT2);
        int gpi_stat3 = adp5588_read(kpad->client, GPIO_DAT_STAT3);
        int gpi_stat_tmp, pin_loc;
        int i;

        for (i = 0; i < kpad->gpimapsize; i++) {
                unsigned short pin = kpad->gpimap[i].pin;

                if (pin <= GPI_PIN_ROW_END) {
                        gpi_stat_tmp = gpi_stat1;
                        pin_loc = pin - GPI_PIN_ROW_BASE;
                } else if ((pin - GPI_PIN_COL_BASE) < 8) {
                        gpi_stat_tmp = gpi_stat2;
                        pin_loc = pin - GPI_PIN_COL_BASE;
                } else {
                        gpi_stat_tmp = gpi_stat3;
                        pin_loc = pin - GPI_PIN_COL_BASE - 8;
                }

                if (gpi_stat_tmp < 0) {
                        dev_err(&kpad->client->dev,
                                "Can't read GPIO_DAT_STAT switch %d default to OFF\n",
                                pin);
                        gpi_stat_tmp = 0;
                }

                input_report_switch(kpad->input,
                                    kpad->gpimap[i].sw_evt,
                                    !(gpi_stat_tmp & (1 << pin_loc)));
        }

        input_sync(kpad->input);
}


static int adp5588_probe(struct i2c_client *client,
                         const struct i2c_device_id *id)
{
        struct adp5588_kpad *kpad;
        const struct adp5588_kpad_platform_data *pdata =
                        dev_get_platdata(&client->dev);
        struct input_dev *input;
        unsigned int revid;
        int ret, i;
        int error;

        if (!i2c_check_functionality(client->adapter,
                                        I2C_FUNC_SMBUS_BYTE_DATA)) {
                dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
                return -EIO;
        }

        if (!pdata) {
                dev_err(&client->dev, "no platform data?\n");
                return -EINVAL;
        }

        if (!pdata->rows || !pdata->cols || !pdata->keymap) {
                dev_err(&client->dev, "no rows, cols or keymap from pdata\n");
                return -EINVAL;
        }

        if (pdata->keymapsize != ADP5588_KEYMAPSIZE) {
                dev_err(&client->dev, "invalid keymapsize\n");
                return -EINVAL;
        }

        if (!pdata->gpimap && pdata->gpimapsize) {
                dev_err(&client->dev, "invalid gpimap from pdata\n");
                return -EINVAL;
        }

        if (pdata->gpimapsize > ADP5588_GPIMAPSIZE_MAX) {
                dev_err(&client->dev, "invalid gpimapsize\n");
                return -EINVAL;
        }

        for (i = 0; i < pdata->gpimapsize; i++) {
                unsigned short pin = pdata->gpimap[i].pin;

                if (pin < GPI_PIN_BASE || pin > GPI_PIN_END) {
                        dev_err(&client->dev, "invalid gpi pin data\n");
                        return -EINVAL;
                }

                if (pin <= GPI_PIN_ROW_END) {
                        if (pin - GPI_PIN_ROW_BASE + 1 <= pdata->rows) {
                                dev_err(&client->dev, "invalid gpi row data\n");
                                return -EINVAL;
                        }
                } else {
                        if (pin - GPI_PIN_COL_BASE + 1 <= pdata->cols) {
                                dev_err(&client->dev, "invalid gpi col data\n");
                                return -EINVAL;
                        }
                }
        }

        if (!client->irq) {
                dev_err(&client->dev, "no IRQ?\n");
                return -EINVAL;
        }

        kpad = kzalloc(sizeof(*kpad), GFP_KERNEL);
        input = input_allocate_device();
        if (!kpad || !input) {
                error = -ENOMEM;
                goto err_free_mem;
        }

        kpad->client = client;
        kpad->input = input;
        INIT_DELAYED_WORK(&kpad->work, adp5588_work);

        ret = adp5588_read(client, DEV_ID);
        if (ret < 0) {
                error = ret;
                goto err_free_mem;
        }

        revid = (u8) ret & ADP5588_DEVICE_ID_MASK;
        if (WA_DELAYED_READOUT_REVID(revid))
                kpad->delay = msecs_to_jiffies(30);

        input->name = client->name;
        input->phys = "adp5588-keys/input0";
        input->dev.parent = &client->dev;

        input_set_drvdata(input, kpad);

        input->id.bustype = BUS_I2C;
        input->id.vendor = 0x0001;
        input->id.product = 0x0001;
        input->id.version = revid;

        input->keycodesize = sizeof(kpad->keycode[0]);
        input->keycodemax = pdata->keymapsize;
        input->keycode = kpad->keycode;

        memcpy(kpad->keycode, pdata->keymap,
                pdata->keymapsize * input->keycodesize);

        kpad->gpimap = pdata->gpimap;
        kpad->gpimapsize = pdata->gpimapsize;

        /* setup input device */
        __set_bit(EV_KEY, input->evbit);

        if (pdata->repeat)
                __set_bit(EV_REP, input->evbit);

        for (i = 0; i < input->keycodemax; i++)
                if (kpad->keycode[i] <= KEY_MAX)
                        __set_bit(kpad->keycode[i], input->keybit);
        __clear_bit(KEY_RESERVED, input->keybit);

        if (kpad->gpimapsize)
                __set_bit(EV_SW, input->evbit);
        for (i = 0; i < kpad->gpimapsize; i++)
                __set_bit(kpad->gpimap[i].sw_evt, input->swbit);

        error = input_register_device(input);
        if (error) {
                dev_err(&client->dev, "unable to register input device\n");
                goto err_free_mem;
        }

        error = request_irq(client->irq, adp5588_irq,
                            IRQF_TRIGGER_FALLING,
                            client->dev.driver->name, kpad);
        if (error) {
                dev_err(&client->dev, "irq %d busy?\n", client->irq);
                goto err_unreg_dev;
        }

        error = adp5588_setup(client);
        if (error)
                goto err_free_irq;

        if (kpad->gpimapsize)
                adp5588_report_switch_state(kpad);

        error = adp5588_gpio_add(kpad);
        if (error)
                goto err_free_irq;

        device_init_wakeup(&client->dev, 1);
        i2c_set_clientdata(client, kpad);

        dev_info(&client->dev, "Rev.%d keypad, irq %d\n", revid, client->irq);
        return 0;

 err_free_irq:
        free_irq(client->irq, kpad);
        cancel_delayed_work_sync(&kpad->work);
 err_unreg_dev:
        input_unregister_device(input);
        input = NULL;
 err_free_mem:
        input_free_device(input);
        kfree(kpad);

        return error;
}

static int adp5588_remove(struct i2c_client *client)
{
        struct adp5588_kpad *kpad = i2c_get_clientdata(client);

        adp5588_write(client, CFG, 0);
        free_irq(client->irq, kpad);
        cancel_delayed_work_sync(&kpad->work);
        input_unregister_device(kpad->input);
        adp5588_gpio_remove(kpad);
        kfree(kpad);

        return 0;
}

#ifdef CONFIG_PM
static int adp5588_suspend(struct device *dev)
{
        struct adp5588_kpad *kpad = dev_get_drvdata(dev);
        struct i2c_client *client = kpad->client;

        disable_irq(client->irq);
        cancel_delayed_work_sync(&kpad->work);

        if (device_may_wakeup(&client->dev))
                enable_irq_wake(client->irq);

        return 0;
}

static int adp5588_resume(struct device *dev)
{
        struct adp5588_kpad *kpad = dev_get_drvdata(dev);
        struct i2c_client *client = kpad->client;

        if (device_may_wakeup(&client->dev))
                disable_irq_wake(client->irq);

        enable_irq(client->irq);

        return 0;
}

static const struct dev_pm_ops adp5588_dev_pm_ops = {
        .suspend = adp5588_suspend,
        .resume  = adp5588_resume,
};
#endif

static const struct i2c_device_id adp5588_id[] = {
        { "adp5588-keys", 0 },
        { "adp5587-keys", 0 },
        { }
};
MODULE_DEVICE_TABLE(i2c, adp5588_id);

static struct i2c_driver adp5588_driver = {
        .driver = {
                .name = KBUILD_MODNAME,
#ifdef CONFIG_PM
                .pm   = &adp5588_dev_pm_ops,
#endif
        },
        .probe    = adp5588_probe,
        .remove   = adp5588_remove,
        .id_table = adp5588_id,
};

module_i2c_driver(adp5588_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("ADP5588/87 Keypad driver");