static int ot200_backlight_probe(struct platform_device *pdev)
{
struct backlight_device *bl;
struct ot200_backlight_data *data;
struct backlight_properties props;
int retval = 0;
/* request gpio */
if (devm_gpio_request(&pdev->dev, GPIO_DIMM,
"ot200 backlight dimmer") < 0) {
dev_err(&pdev->dev, "failed to request GPIO %d\n", GPIO_DIMM);
return -ENODEV;
}
/* request timer */
pwm_timer = cs5535_mfgpt_alloc_timer(7, MFGPT_DOMAIN_ANY);
if (!pwm_timer) {
dev_err(&pdev->dev, "MFGPT 7 not available\n");
return -ENODEV;
}
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data) {
retval = -ENOMEM;
goto error_devm_kzalloc;
}
/* setup gpio */
cs5535_gpio_set(GPIO_DIMM, GPIO_OUTPUT_ENABLE);
cs5535_gpio_set(GPIO_DIMM, GPIO_OUTPUT_AUX1);
/* setup timer */
cs5535_mfgpt_write(pwm_timer, MFGPT_REG_CMP1, 0);
cs5535_mfgpt_write(pwm_timer, MFGPT_REG_CMP2, MAX_COMP2);
cs5535_mfgpt_write(pwm_timer, MFGPT_REG_SETUP, PWM_SETUP);
data->current_brightness = 100;
props.max_brightness = 100;
props.brightness = 100;
props.type = BACKLIGHT_RAW;
bl = devm_backlight_device_register(&pdev->dev, dev_name(&pdev->dev),
&pdev->dev, data, &ot200_backlight_ops,
&props);
if (IS_ERR(bl)) {
dev_err(&pdev->dev, "failed to register backlight\n");
retval = PTR_ERR(bl);
goto error_devm_kzalloc;
}
platform_set_drvdata(pdev, bl);
return 0;
error_devm_kzalloc:
cs5535_mfgpt_free_timer(pwm_timer);
return retval;
}
static int __init cs5535_mfgpt_init(void)
{
struct cs5535_mfgpt_timer *timer;
int ret;
uint16_t val;
timer = cs5535_mfgpt_alloc_timer(MFGPT_TIMER_ANY, MFGPT_DOMAIN_WORKING);
if (!timer) {
printk(KERN_ERR DRV_NAME ": Could not allocate MFPGT timer\n");
return -ENODEV;
}
cs5535_event_clock = timer;
/* Set up the IRQ on the MFGPT side */
if (cs5535_mfgpt_setup_irq(timer, MFGPT_CMP2, &timer_irq)) {
printk(KERN_ERR DRV_NAME ": Could not set up IRQ %d\n",
timer_irq);
goto err_timer;
}
/* And register it with the kernel */
ret = setup_irq(timer_irq, &mfgptirq);
if (ret) {
printk(KERN_ERR DRV_NAME ": Unable to set up the interrupt.\n");
goto err_irq;
}
/* Set the clock scale and enable the event mode for CMP2 */
val = MFGPT_SCALE | (3 << 8);
cs5535_mfgpt_write(cs5535_event_clock, MFGPT_REG_SETUP, val);
/* Set up the clock event */
cs5535_clockevent.mult = div_sc(MFGPT_HZ, NSEC_PER_SEC,
cs5535_clockevent.shift);
cs5535_clockevent.min_delta_ns = clockevent_delta2ns(0xF,
&cs5535_clockevent);
cs5535_clockevent.max_delta_ns = clockevent_delta2ns(0xFFFE,
&cs5535_clockevent);
printk(KERN_INFO DRV_NAME
": Registering MFGPT timer as a clock event, using IRQ %d\n",
timer_irq);
clockevents_register_device(&cs5535_clockevent);
return 0;
err_irq:
cs5535_mfgpt_release_irq(cs5535_event_clock, MFGPT_CMP2, &timer_irq);
err_timer:
cs5535_mfgpt_free_timer(cs5535_event_clock);
printk(KERN_ERR DRV_NAME ": Unable to set up the MFGPT clock source\n");
return -EIO;
}
static int ot200_backlight_remove(struct platform_device *pdev)
{
/* on module unload set brightness to 100% */
cs5535_mfgpt_write(pwm_timer, MFGPT_REG_COUNTER, 0);
cs5535_mfgpt_write(pwm_timer, MFGPT_REG_SETUP, MFGPT_SETUP_CNTEN);
cs5535_mfgpt_write(pwm_timer, MFGPT_REG_CMP1,
MAX_COMP2 - dim_table[100]);
cs5535_mfgpt_free_timer(pwm_timer);
return 0;
}
