diff options
Diffstat (limited to 'drivers/mfd/ucb1x00-core.c')
| -rw-r--r-- | drivers/mfd/ucb1x00-core.c | 89 |
1 files changed, 86 insertions, 3 deletions
diff --git a/drivers/mfd/ucb1x00-core.c b/drivers/mfd/ucb1x00-core.c index 60c3988f3cf3..252b74188ec2 100644 --- a/drivers/mfd/ucb1x00-core.c +++ b/drivers/mfd/ucb1x00-core.c @@ -25,12 +25,12 @@ #include <linux/interrupt.h> #include <linux/device.h> #include <linux/mutex.h> +#include <linux/mfd/ucb1x00.h> +#include <linux/gpio.h> #include <mach/dma.h> #include <mach/hardware.h> -#include "ucb1x00.h" - static DEFINE_MUTEX(ucb1x00_mutex); static LIST_HEAD(ucb1x00_drivers); static LIST_HEAD(ucb1x00_devices); @@ -108,6 +108,60 @@ 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_reg_write(ucb, UCB_IO_DATA, ucb->io_out); + 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); + return ucb1x00_reg_read(ucb, UCB_IO_DATA) & (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_reg_write(ucb, UCB_IO_DIR, ucb->io_dir); + 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; + + spin_lock_irqsave(&ucb->io_lock, flags); + ucb->io_dir |= (1 << offset); + ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir); + + if (value) + ucb->io_out |= 1 << offset; + else + ucb->io_out &= ~(1 << offset); + ucb1x00_reg_write(ucb, UCB_IO_DATA, ucb->io_out); + spin_unlock_irqrestore(&ucb->io_lock, flags); + + return 0; +} + /* * UCB1300 data sheet says we must: * 1. enable ADC => 5us (including reference startup time) @@ -476,6 +530,7 @@ static int ucb1x00_probe(struct mcp *mcp) struct ucb1x00_driver *drv; unsigned int id; int ret = -ENODEV; + int temp; mcp_enable(mcp); id = mcp_reg_read(mcp, UCB_ID); @@ -508,12 +563,27 @@ static int ucb1x00_probe(struct mcp *mcp) goto err_free; } + ucb->gpio.base = -1; + if (mcp->gpio_base != 0) { + ucb->gpio.label = dev_name(&ucb->dev); + ucb->gpio.base = mcp->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; + ret = gpiochip_add(&ucb->gpio); + if (ret) + goto err_free; + } else + dev_info(&ucb->dev, "gpio_base not set so no gpiolib support"); + ret = request_irq(ucb->irq, ucb1x00_irq, IRQF_TRIGGER_RISING, "UCB1x00", ucb); if (ret) { printk(KERN_ERR "ucb1x00: unable to grab irq%d: %d\n", ucb->irq, ret); - goto err_free; + goto err_gpio; } mcp_set_drvdata(mcp, ucb); @@ -522,6 +592,7 @@ static int ucb1x00_probe(struct mcp *mcp) if (ret) goto err_irq; + INIT_LIST_HEAD(&ucb->devs); mutex_lock(&ucb1x00_mutex); list_add(&ucb->node, &ucb1x00_devices); @@ -529,10 +600,14 @@ static int ucb1x00_probe(struct mcp *mcp) ucb1x00_add_dev(ucb, drv); } mutex_unlock(&ucb1x00_mutex); + goto out; err_irq: free_irq(ucb->irq, ucb); + err_gpio: + if (ucb->gpio.base != -1) + temp = gpiochip_remove(&ucb->gpio); err_free: kfree(ucb); err_disable: @@ -545,6 +620,7 @@ static void ucb1x00_remove(struct mcp *mcp) { struct ucb1x00 *ucb = mcp_get_drvdata(mcp); struct list_head *l, *n; + int ret; mutex_lock(&ucb1x00_mutex); list_del(&ucb->node); @@ -554,6 +630,12 @@ static void ucb1x00_remove(struct mcp *mcp) } 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); + } + free_irq(ucb->irq, ucb); device_unregister(&ucb->dev); } @@ -604,6 +686,7 @@ static int ucb1x00_resume(struct mcp *mcp) struct ucb1x00 *ucb = mcp_get_drvdata(mcp); struct ucb1x00_dev *dev; + ucb1x00_reg_write(ucb, UCB_IO_DIR, ucb->io_dir); mutex_lock(&ucb1x00_mutex); list_for_each_entry(dev, &ucb->devs, dev_node) { if (dev->drv->resume) |