diff options
Diffstat (limited to 'drivers/mfd/ucb1x00-core.c')
| -rw-r--r-- | drivers/mfd/ucb1x00-core.c | 788 |
1 files changed, 788 insertions, 0 deletions
diff --git a/drivers/mfd/ucb1x00-core.c b/drivers/mfd/ucb1x00-core.c new file mode 100644 index 00000000..70f02dae --- /dev/null +++ b/drivers/mfd/ucb1x00-core.c @@ -0,0 +1,788 @@ +/* + * linux/drivers/mfd/ucb1x00-core.c + * + * Copyright (C) 2001 Russell King, All Rights Reserved. + * + * 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. + * + * The UCB1x00 core driver provides basic services for handling IO, + * the ADC, interrupts, and accessing registers. It is designed + * such that everything goes through this layer, thereby providing + * a consistent locking methodology, as well as allowing the drivers + * to be used on other non-MCP-enabled hardware platforms. + * + * Note that all locks are private to this file. Nothing else may + * touch them. + */ +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/device.h> +#include <linux/mutex.h> +#include <linux/mfd/ucb1x00.h> +#include <linux/pm.h> +#include <linux/gpio.h> + +static DEFINE_MUTEX(ucb1x00_mutex); +static LIST_HEAD(ucb1x00_drivers); +static LIST_HEAD(ucb1x00_devices); + +/** + * ucb1x00_io_set_dir - set IO direction + * @ucb: UCB1x00 structure describing chip + * @in: bitfield of IO pins to be set as inputs + * @out: bitfield of IO pins to be set as outputs + * + * Set the IO direction of the ten general purpose IO pins on + * the UCB1x00 chip. The @in bitfield has priority over the + * @out bitfield, in that if you specify a pin as both input + * and output, it will end up as an input. + * + * ucb1x00_enable must have been called to enable the comms + * before using this function. + * + * This function takes a spinlock, disabling interrupts. + */ +void ucb1x00_io_set_dir(struct ucb1x00 *ucb, unsigned int in, unsigned int out) +{ + unsigned long flags; + + spin_lock_irqsave(&ucb->io_lock, flags); + ucb->io_dir |= out; + ucb->io_dir &= ~in; + + ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir); + spin_unlock_irqrestore(&ucb->io_lock, flags); +} + +/** + * ucb1x00_io_write - set or clear IO outputs + * @ucb: UCB1x00 structure describing chip + * @set: bitfield of IO pins to set to logic '1' + * @clear: bitfield of IO pins to set to logic '0' + * + * Set the IO output state of the specified IO pins. The value + * is retained if the pins are subsequently configured as inputs. + * The @clear bitfield has priority over the @set bitfield - + * outputs will be cleared. + * + * ucb1x00_enable must have been called to enable the comms + * before using this function. + * + * This function takes a spinlock, disabling interrupts. + */ +void ucb1x00_io_write(struct ucb1x00 *ucb, unsigned int set, unsigned int clear) +{ + unsigned long flags; + + spin_lock_irqsave(&ucb->io_lock, flags); + ucb->io_out |= set; + ucb->io_out &= ~clear; + + ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out); + spin_unlock_irqrestore(&ucb->io_lock, flags); +} + +/** + * ucb1x00_io_read - read the current state of the IO pins + * @ucb: UCB1x00 structure describing chip + * + * Return a bitfield describing the logic state of the ten + * general purpose IO pins. + * + * ucb1x00_enable must have been called to enable the comms + * before using this function. + * + * This function does not take any mutexes or spinlocks. + */ +unsigned int ucb1x00_io_read(struct ucb1x00 *ucb) +{ + return ucb1x00_reg_read(ucb, UCB_IO_DATA); +} + +static void ucb1x00_gpio_set(struct gpio_chip *chip, unsigned offset, int value) +{ + struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio); + unsigned long flags; + + spin_lock_irqsave(&ucb->io_lock, flags); + if (value) + ucb->io_out |= 1 << offset; + else + ucb->io_out &= ~(1 << offset); + + ucb1x00_enable(ucb); + ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out); + ucb1x00_disable(ucb); + spin_unlock_irqrestore(&ucb->io_lock, flags); +} + +static int ucb1x00_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio); + unsigned val; + + ucb1x00_enable(ucb); + val = ucb1x00_reg_read(ucb, UCB_IO_DATA); + ucb1x00_disable(ucb); + + return val & (1 << offset); +} + +static int ucb1x00_gpio_direction_input(struct gpio_chip *chip, unsigned offset) +{ + struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio); + unsigned long flags; + + spin_lock_irqsave(&ucb->io_lock, flags); + ucb->io_dir &= ~(1 << offset); + ucb1x00_enable(ucb); + ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir); + ucb1x00_disable(ucb); + spin_unlock_irqrestore(&ucb->io_lock, flags); + + return 0; +} + +static int ucb1x00_gpio_direction_output(struct gpio_chip *chip, unsigned offset + , int value) +{ + struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio); + unsigned long flags; + unsigned old, mask = 1 << offset; + + spin_lock_irqsave(&ucb->io_lock, flags); + old = ucb->io_out; + if (value) + ucb->io_out |= mask; + else + ucb->io_out &= ~mask; + + ucb1x00_enable(ucb); + if (old != ucb->io_out) + ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out); + + if (!(ucb->io_dir & mask)) { + ucb->io_dir |= mask; + ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir); + } + ucb1x00_disable(ucb); + spin_unlock_irqrestore(&ucb->io_lock, flags); + + return 0; +} + +static int ucb1x00_to_irq(struct gpio_chip *chip, unsigned offset) +{ + struct ucb1x00 *ucb = container_of(chip, struct ucb1x00, gpio); + + return ucb->irq_base > 0 ? ucb->irq_base + offset : -ENXIO; +} + +/* + * UCB1300 data sheet says we must: + * 1. enable ADC => 5us (including reference startup time) + * 2. select input => 51*tsibclk => 4.3us + * 3. start conversion => 102*tsibclk => 8.5us + * (tsibclk = 1/11981000) + * Period between SIB 128-bit frames = 10.7us + */ + +/** + * ucb1x00_adc_enable - enable the ADC converter + * @ucb: UCB1x00 structure describing chip + * + * Enable the ucb1x00 and ADC converter on the UCB1x00 for use. + * Any code wishing to use the ADC converter must call this + * function prior to using it. + * + * This function takes the ADC mutex to prevent two or more + * concurrent uses, and therefore may sleep. As a result, it + * can only be called from process context, not interrupt + * context. + * + * You should release the ADC as soon as possible using + * ucb1x00_adc_disable. + */ +void ucb1x00_adc_enable(struct ucb1x00 *ucb) +{ + mutex_lock(&ucb->adc_mutex); + + ucb->adc_cr |= UCB_ADC_ENA; + + ucb1x00_enable(ucb); + ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr); +} + +/** + * ucb1x00_adc_read - read the specified ADC channel + * @ucb: UCB1x00 structure describing chip + * @adc_channel: ADC channel mask + * @sync: wait for syncronisation pulse. + * + * Start an ADC conversion and wait for the result. Note that + * synchronised ADC conversions (via the ADCSYNC pin) must wait + * until the trigger is asserted and the conversion is finished. + * + * This function currently spins waiting for the conversion to + * complete (2 frames max without sync). + * + * If called for a synchronised ADC conversion, it may sleep + * with the ADC mutex held. + */ +unsigned int ucb1x00_adc_read(struct ucb1x00 *ucb, int adc_channel, int sync) +{ + unsigned int val; + + if (sync) + adc_channel |= UCB_ADC_SYNC_ENA; + + ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr | adc_channel); + ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr | adc_channel | UCB_ADC_START); + + for (;;) { + val = ucb1x00_reg_read(ucb, UCB_ADC_DATA); + if (val & UCB_ADC_DAT_VAL) + break; + /* yield to other processes */ + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(1); + } + + return UCB_ADC_DAT(val); +} + +/** + * ucb1x00_adc_disable - disable the ADC converter + * @ucb: UCB1x00 structure describing chip + * + * Disable the ADC converter and release the ADC mutex. + */ +void ucb1x00_adc_disable(struct ucb1x00 *ucb) +{ + ucb->adc_cr &= ~UCB_ADC_ENA; + ucb1x00_reg_write(ucb, UCB_ADC_CR, ucb->adc_cr); + ucb1x00_disable(ucb); + + mutex_unlock(&ucb->adc_mutex); +} + +/* + * UCB1x00 Interrupt handling. + * + * The UCB1x00 can generate interrupts when the SIBCLK is stopped. + * Since we need to read an internal register, we must re-enable + * SIBCLK to talk to the chip. We leave the clock running until + * we have finished processing all interrupts from the chip. + */ +static void ucb1x00_irq(unsigned int irq, struct irq_desc *desc) +{ + struct ucb1x00 *ucb = irq_desc_get_handler_data(desc); + unsigned int isr, i; + + ucb1x00_enable(ucb); + isr = ucb1x00_reg_read(ucb, UCB_IE_STATUS); + ucb1x00_reg_write(ucb, UCB_IE_CLEAR, isr); + ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0); + + for (i = 0; i < 16 && isr; i++, isr >>= 1, irq++) + if (isr & 1) + generic_handle_irq(ucb->irq_base + i); + ucb1x00_disable(ucb); +} + +static void ucb1x00_irq_update(struct ucb1x00 *ucb, unsigned mask) +{ + ucb1x00_enable(ucb); + if (ucb->irq_ris_enbl & mask) + ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl & + ucb->irq_mask); + if (ucb->irq_fal_enbl & mask) + ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl & + ucb->irq_mask); + ucb1x00_disable(ucb); +} + +static void ucb1x00_irq_noop(struct irq_data *data) +{ +} + +static void ucb1x00_irq_mask(struct irq_data *data) +{ + struct ucb1x00 *ucb = irq_data_get_irq_chip_data(data); + unsigned mask = 1 << (data->irq - ucb->irq_base); + + raw_spin_lock(&ucb->irq_lock); + ucb->irq_mask &= ~mask; + ucb1x00_irq_update(ucb, mask); + raw_spin_unlock(&ucb->irq_lock); +} + +static void ucb1x00_irq_unmask(struct irq_data *data) +{ + struct ucb1x00 *ucb = irq_data_get_irq_chip_data(data); + unsigned mask = 1 << (data->irq - ucb->irq_base); + + raw_spin_lock(&ucb->irq_lock); + ucb->irq_mask |= mask; + ucb1x00_irq_update(ucb, mask); + raw_spin_unlock(&ucb->irq_lock); +} + +static int ucb1x00_irq_set_type(struct irq_data *data, unsigned int type) +{ + struct ucb1x00 *ucb = irq_data_get_irq_chip_data(data); + unsigned mask = 1 << (data->irq - ucb->irq_base); + + raw_spin_lock(&ucb->irq_lock); + if (type & IRQ_TYPE_EDGE_RISING) + ucb->irq_ris_enbl |= mask; + else + ucb->irq_ris_enbl &= ~mask; + + if (type & IRQ_TYPE_EDGE_FALLING) + ucb->irq_fal_enbl |= mask; + else + ucb->irq_fal_enbl &= ~mask; + if (ucb->irq_mask & mask) { + ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl & + ucb->irq_mask); + ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl & + ucb->irq_mask); + } + raw_spin_unlock(&ucb->irq_lock); + + return 0; +} + +static int ucb1x00_irq_set_wake(struct irq_data *data, unsigned int on) +{ + struct ucb1x00 *ucb = irq_data_get_irq_chip_data(data); + struct ucb1x00_plat_data *pdata = ucb->mcp->attached_device.platform_data; + unsigned mask = 1 << (data->irq - ucb->irq_base); + + if (!pdata || !pdata->can_wakeup) + return -EINVAL; + + raw_spin_lock(&ucb->irq_lock); + if (on) + ucb->irq_wake |= mask; + else + ucb->irq_wake &= ~mask; + raw_spin_unlock(&ucb->irq_lock); + + return 0; +} + +static struct irq_chip ucb1x00_irqchip = { + .name = "ucb1x00", + .irq_ack = ucb1x00_irq_noop, + .irq_mask = ucb1x00_irq_mask, + .irq_unmask = ucb1x00_irq_unmask, + .irq_set_type = ucb1x00_irq_set_type, + .irq_set_wake = ucb1x00_irq_set_wake, +}; + +static int ucb1x00_add_dev(struct ucb1x00 *ucb, struct ucb1x00_driver *drv) +{ + struct ucb1x00_dev *dev; + int ret = -ENOMEM; + + dev = kmalloc(sizeof(struct ucb1x00_dev), GFP_KERNEL); + if (dev) { + dev->ucb = ucb; + dev->drv = drv; + + ret = drv->add(dev); + + if (ret == 0) { + list_add_tail(&dev->dev_node, &ucb->devs); + list_add_tail(&dev->drv_node, &drv->devs); + } else { + kfree(dev); + } + } + return ret; +} + +static void ucb1x00_remove_dev(struct ucb1x00_dev *dev) +{ + dev->drv->remove(dev); + list_del(&dev->dev_node); + list_del(&dev->drv_node); + kfree(dev); +} + +/* + * Try to probe our interrupt, rather than relying on lots of + * hard-coded machine dependencies. For reference, the expected + * IRQ mappings are: + * + * Machine Default IRQ + * adsbitsy IRQ_GPCIN4 + * cerf IRQ_GPIO_UCB1200_IRQ + * flexanet IRQ_GPIO_GUI + * freebird IRQ_GPIO_FREEBIRD_UCB1300_IRQ + * graphicsclient ADS_EXT_IRQ(8) + * graphicsmaster ADS_EXT_IRQ(8) + * lart LART_IRQ_UCB1200 + * omnimeter IRQ_GPIO23 + * pfs168 IRQ_GPIO_UCB1300_IRQ + * simpad IRQ_GPIO_UCB1300_IRQ + * shannon SHANNON_IRQ_GPIO_IRQ_CODEC + * yopy IRQ_GPIO_UCB1200_IRQ + */ +static int ucb1x00_detect_irq(struct ucb1x00 *ucb) +{ + unsigned long mask; + + mask = probe_irq_on(); + if (!mask) { + probe_irq_off(mask); + return NO_IRQ; + } + + /* + * Enable the ADC interrupt. + */ + ucb1x00_reg_write(ucb, UCB_IE_RIS, UCB_IE_ADC); + ucb1x00_reg_write(ucb, UCB_IE_FAL, UCB_IE_ADC); + ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0xffff); + ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0); + + /* + * Cause an ADC interrupt. + */ + ucb1x00_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA); + ucb1x00_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA | UCB_ADC_START); + + /* + * Wait for the conversion to complete. + */ + while ((ucb1x00_reg_read(ucb, UCB_ADC_DATA) & UCB_ADC_DAT_VAL) == 0); + ucb1x00_reg_write(ucb, UCB_ADC_CR, 0); + + /* + * Disable and clear interrupt. + */ + ucb1x00_reg_write(ucb, UCB_IE_RIS, 0); + ucb1x00_reg_write(ucb, UCB_IE_FAL, 0); + ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0xffff); + ucb1x00_reg_write(ucb, UCB_IE_CLEAR, 0); + + /* + * Read triggered interrupt. + */ + return probe_irq_off(mask); +} + +static void ucb1x00_release(struct device *dev) +{ + struct ucb1x00 *ucb = classdev_to_ucb1x00(dev); + kfree(ucb); +} + +static struct class ucb1x00_class = { + .name = "ucb1x00", + .dev_release = ucb1x00_release, +}; + +static int ucb1x00_probe(struct mcp *mcp) +{ + struct ucb1x00_plat_data *pdata = mcp->attached_device.platform_data; + struct ucb1x00_driver *drv; + struct ucb1x00 *ucb; + unsigned id, i, irq_base; + int ret = -ENODEV; + + /* Tell the platform to deassert the UCB1x00 reset */ + if (pdata && pdata->reset) + pdata->reset(UCB_RST_PROBE); + + mcp_enable(mcp); + id = mcp_reg_read(mcp, UCB_ID); + mcp_disable(mcp); + + if (id != UCB_ID_1200 && id != UCB_ID_1300 && id != UCB_ID_TC35143) { + printk(KERN_WARNING "UCB1x00 ID not found: %04x\n", id); + goto out; + } + + ucb = kzalloc(sizeof(struct ucb1x00), GFP_KERNEL); + ret = -ENOMEM; + if (!ucb) + goto out; + + device_initialize(&ucb->dev); + ucb->dev.class = &ucb1x00_class; + ucb->dev.parent = &mcp->attached_device; + dev_set_name(&ucb->dev, "ucb1x00"); + + raw_spin_lock_init(&ucb->irq_lock); + spin_lock_init(&ucb->io_lock); + mutex_init(&ucb->adc_mutex); + + ucb->id = id; + ucb->mcp = mcp; + + ret = device_add(&ucb->dev); + if (ret) + goto err_dev_add; + + ucb1x00_enable(ucb); + ucb->irq = ucb1x00_detect_irq(ucb); + ucb1x00_disable(ucb); + if (ucb->irq == NO_IRQ) { + dev_err(&ucb->dev, "IRQ probe failed\n"); + ret = -ENODEV; + goto err_no_irq; + } + + ucb->gpio.base = -1; + irq_base = pdata ? pdata->irq_base : 0; + ucb->irq_base = irq_alloc_descs(-1, irq_base, 16, -1); + if (ucb->irq_base < 0) { + dev_err(&ucb->dev, "unable to allocate 16 irqs: %d\n", + ucb->irq_base); + goto err_irq_alloc; + } + + for (i = 0; i < 16; i++) { + unsigned irq = ucb->irq_base + i; + + irq_set_chip_and_handler(irq, &ucb1x00_irqchip, handle_edge_irq); + irq_set_chip_data(irq, ucb); + set_irq_flags(irq, IRQF_VALID | IRQ_NOREQUEST); + } + + irq_set_irq_type(ucb->irq, IRQ_TYPE_EDGE_RISING); + irq_set_handler_data(ucb->irq, ucb); + irq_set_chained_handler(ucb->irq, ucb1x00_irq); + + if (pdata && pdata->gpio_base) { + ucb->gpio.label = dev_name(&ucb->dev); + ucb->gpio.dev = &ucb->dev; + ucb->gpio.owner = THIS_MODULE; + ucb->gpio.base = pdata->gpio_base; + ucb->gpio.ngpio = 10; + ucb->gpio.set = ucb1x00_gpio_set; + ucb->gpio.get = ucb1x00_gpio_get; + ucb->gpio.direction_input = ucb1x00_gpio_direction_input; + ucb->gpio.direction_output = ucb1x00_gpio_direction_output; + ucb->gpio.to_irq = ucb1x00_to_irq; + ret = gpiochip_add(&ucb->gpio); + if (ret) + goto err_gpio_add; + } else + dev_info(&ucb->dev, "gpio_base not set so no gpiolib support"); + + mcp_set_drvdata(mcp, ucb); + + if (pdata) + device_set_wakeup_capable(&ucb->dev, pdata->can_wakeup); + + INIT_LIST_HEAD(&ucb->devs); + mutex_lock(&ucb1x00_mutex); + list_add_tail(&ucb->node, &ucb1x00_devices); + list_for_each_entry(drv, &ucb1x00_drivers, node) { + ucb1x00_add_dev(ucb, drv); + } + mutex_unlock(&ucb1x00_mutex); + + return ret; + + err_gpio_add: + irq_set_chained_handler(ucb->irq, NULL); + err_irq_alloc: + if (ucb->irq_base > 0) + irq_free_descs(ucb->irq_base, 16); + err_no_irq: + device_del(&ucb->dev); + err_dev_add: + put_device(&ucb->dev); + out: + if (pdata && pdata->reset) + pdata->reset(UCB_RST_PROBE_FAIL); + return ret; +} + +static void ucb1x00_remove(struct mcp *mcp) +{ + struct ucb1x00_plat_data *pdata = mcp->attached_device.platform_data; + struct ucb1x00 *ucb = mcp_get_drvdata(mcp); + struct list_head *l, *n; + int ret; + + mutex_lock(&ucb1x00_mutex); + list_del(&ucb->node); + list_for_each_safe(l, n, &ucb->devs) { + struct ucb1x00_dev *dev = list_entry(l, struct ucb1x00_dev, dev_node); + ucb1x00_remove_dev(dev); + } + mutex_unlock(&ucb1x00_mutex); + + if (ucb->gpio.base != -1) { + ret = gpiochip_remove(&ucb->gpio); + if (ret) + dev_err(&ucb->dev, "Can't remove gpio chip: %d\n", ret); + } + + irq_set_chained_handler(ucb->irq, NULL); + irq_free_descs(ucb->irq_base, 16); + device_unregister(&ucb->dev); + + if (pdata && pdata->reset) + pdata->reset(UCB_RST_REMOVE); +} + +int ucb1x00_register_driver(struct ucb1x00_driver *drv) +{ + struct ucb1x00 *ucb; + + INIT_LIST_HEAD(&drv->devs); + mutex_lock(&ucb1x00_mutex); + list_add_tail(&drv->node, &ucb1x00_drivers); + list_for_each_entry(ucb, &ucb1x00_devices, node) { + ucb1x00_add_dev(ucb, drv); + } + mutex_unlock(&ucb1x00_mutex); + return 0; +} + +void ucb1x00_unregister_driver(struct ucb1x00_driver *drv) +{ + struct list_head *n, *l; + + mutex_lock(&ucb1x00_mutex); + list_del(&drv->node); + list_for_each_safe(l, n, &drv->devs) { + struct ucb1x00_dev *dev = list_entry(l, struct ucb1x00_dev, drv_node); + ucb1x00_remove_dev(dev); + } + mutex_unlock(&ucb1x00_mutex); +} + +static int ucb1x00_suspend(struct device *dev) +{ + struct ucb1x00_plat_data *pdata = dev->platform_data; + struct ucb1x00 *ucb = dev_get_drvdata(dev); + struct ucb1x00_dev *udev; + + mutex_lock(&ucb1x00_mutex); + list_for_each_entry(udev, &ucb->devs, dev_node) { + if (udev->drv->suspend) + udev->drv->suspend(udev); + } + mutex_unlock(&ucb1x00_mutex); + + if (ucb->irq_wake) { + unsigned long flags; + + raw_spin_lock_irqsave(&ucb->irq_lock, flags); + ucb1x00_enable(ucb); + ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl & + ucb->irq_wake); + ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl & + ucb->irq_wake); + ucb1x00_disable(ucb); + raw_spin_unlock_irqrestore(&ucb->irq_lock, flags); + + enable_irq_wake(ucb->irq); + } else if (pdata && pdata->reset) + pdata->reset(UCB_RST_SUSPEND); + + return 0; +} + +static int ucb1x00_resume(struct device *dev) +{ + struct ucb1x00_plat_data *pdata = dev->platform_data; + struct ucb1x00 *ucb = dev_get_drvdata(dev); + struct ucb1x00_dev *udev; + + if (!ucb->irq_wake && pdata && pdata->reset) + pdata->reset(UCB_RST_RESUME); + + ucb1x00_enable(ucb); + ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out); + ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir); + + if (ucb->irq_wake) { + unsigned long flags; + + raw_spin_lock_irqsave(&ucb->irq_lock, flags); + ucb1x00_reg_write(ucb, UCB_IE_RIS, ucb->irq_ris_enbl & + ucb->irq_mask); + ucb1x00_reg_write(ucb, UCB_IE_FAL, ucb->irq_fal_enbl & + ucb->irq_mask); + raw_spin_unlock_irqrestore(&ucb->irq_lock, flags); + + disable_irq_wake(ucb->irq); + } + ucb1x00_disable(ucb); + + mutex_lock(&ucb1x00_mutex); + list_for_each_entry(udev, &ucb->devs, dev_node) { + if (udev->drv->resume) + udev->drv->resume(udev); + } + mutex_unlock(&ucb1x00_mutex); + return 0; +} + +static const struct dev_pm_ops ucb1x00_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(ucb1x00_suspend, ucb1x00_resume) +}; + +static struct mcp_driver ucb1x00_driver = { + .drv = { + .name = "ucb1x00", + .owner = THIS_MODULE, + .pm = &ucb1x00_pm_ops, + }, + .probe = ucb1x00_probe, + .remove = ucb1x00_remove, +}; + +static int __init ucb1x00_init(void) +{ + int ret = class_register(&ucb1x00_class); + if (ret == 0) { + ret = mcp_driver_register(&ucb1x00_driver); + if (ret) + class_unregister(&ucb1x00_class); + } + return ret; +} + +static void __exit ucb1x00_exit(void) +{ + mcp_driver_unregister(&ucb1x00_driver); + class_unregister(&ucb1x00_class); +} + +module_init(ucb1x00_init); +module_exit(ucb1x00_exit); + +EXPORT_SYMBOL(ucb1x00_io_set_dir); +EXPORT_SYMBOL(ucb1x00_io_write); +EXPORT_SYMBOL(ucb1x00_io_read); + +EXPORT_SYMBOL(ucb1x00_adc_enable); +EXPORT_SYMBOL(ucb1x00_adc_read); +EXPORT_SYMBOL(ucb1x00_adc_disable); + +EXPORT_SYMBOL(ucb1x00_register_driver); +EXPORT_SYMBOL(ucb1x00_unregister_driver); + +MODULE_ALIAS("mcp:ucb1x00"); +MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); +MODULE_DESCRIPTION("UCB1x00 core driver"); +MODULE_LICENSE("GPL"); |