X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Finput%2Fmisc%2Fbfin_rotary.c;fp=kernel%2Fdrivers%2Finput%2Fmisc%2Fbfin_rotary.c;h=a0fc18fdfc0c62263c21537a2f8105a3820846e3;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git diff --git a/kernel/drivers/input/misc/bfin_rotary.c b/kernel/drivers/input/misc/bfin_rotary.c new file mode 100644 index 000000000..a0fc18fdf --- /dev/null +++ b/kernel/drivers/input/misc/bfin_rotary.c @@ -0,0 +1,295 @@ +/* + * Rotary counter driver for Analog Devices Blackfin Processors + * + * Copyright 2008-2009 Analog Devices Inc. + * Licensed under the GPL-2 or later. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define CNT_CONFIG_OFF 0 /* CNT Config Offset */ +#define CNT_IMASK_OFF 4 /* CNT Interrupt Mask Offset */ +#define CNT_STATUS_OFF 8 /* CNT Status Offset */ +#define CNT_COMMAND_OFF 12 /* CNT Command Offset */ +#define CNT_DEBOUNCE_OFF 16 /* CNT Debounce Offset */ +#define CNT_COUNTER_OFF 20 /* CNT Counter Offset */ +#define CNT_MAX_OFF 24 /* CNT Maximum Count Offset */ +#define CNT_MIN_OFF 28 /* CNT Minimum Count Offset */ + +struct bfin_rot { + struct input_dev *input; + void __iomem *base; + int irq; + unsigned int up_key; + unsigned int down_key; + unsigned int button_key; + unsigned int rel_code; + + unsigned short mode; + unsigned short debounce; + + unsigned short cnt_config; + unsigned short cnt_imask; + unsigned short cnt_debounce; +}; + +static void report_key_event(struct input_dev *input, int keycode) +{ + /* simulate a press-n-release */ + input_report_key(input, keycode, 1); + input_sync(input); + input_report_key(input, keycode, 0); + input_sync(input); +} + +static void report_rotary_event(struct bfin_rot *rotary, int delta) +{ + struct input_dev *input = rotary->input; + + if (rotary->up_key) { + report_key_event(input, + delta > 0 ? rotary->up_key : rotary->down_key); + } else { + input_report_rel(input, rotary->rel_code, delta); + input_sync(input); + } +} + +static irqreturn_t bfin_rotary_isr(int irq, void *dev_id) +{ + struct bfin_rot *rotary = dev_id; + int delta; + + switch (readw(rotary->base + CNT_STATUS_OFF)) { + + case ICII: + break; + + case UCII: + case DCII: + delta = readl(rotary->base + CNT_COUNTER_OFF); + if (delta) + report_rotary_event(rotary, delta); + break; + + case CZMII: + report_key_event(rotary->input, rotary->button_key); + break; + + default: + break; + } + + writew(W1LCNT_ZERO, rotary->base + CNT_COMMAND_OFF); /* Clear COUNTER */ + writew(-1, rotary->base + CNT_STATUS_OFF); /* Clear STATUS */ + + return IRQ_HANDLED; +} + +static int bfin_rotary_open(struct input_dev *input) +{ + struct bfin_rot *rotary = input_get_drvdata(input); + unsigned short val; + + if (rotary->mode & ROT_DEBE) + writew(rotary->debounce & DPRESCALE, + rotary->base + CNT_DEBOUNCE_OFF); + + writew(rotary->mode & ~CNTE, rotary->base + CNT_CONFIG_OFF); + + val = UCIE | DCIE; + if (rotary->button_key) + val |= CZMIE; + writew(val, rotary->base + CNT_IMASK_OFF); + + writew(rotary->mode | CNTE, rotary->base + CNT_CONFIG_OFF); + + return 0; +} + +static void bfin_rotary_close(struct input_dev *input) +{ + struct bfin_rot *rotary = input_get_drvdata(input); + + writew(0, rotary->base + CNT_CONFIG_OFF); + writew(0, rotary->base + CNT_IMASK_OFF); +} + +static void bfin_rotary_free_action(void *data) +{ + peripheral_free_list(data); +} + +static int bfin_rotary_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + const struct bfin_rotary_platform_data *pdata = dev_get_platdata(dev); + struct bfin_rot *rotary; + struct resource *res; + struct input_dev *input; + int error; + + /* Basic validation */ + if ((pdata->rotary_up_key && !pdata->rotary_down_key) || + (!pdata->rotary_up_key && pdata->rotary_down_key)) { + return -EINVAL; + } + + if (pdata->pin_list) { + error = peripheral_request_list(pdata->pin_list, + dev_name(&pdev->dev)); + if (error) { + dev_err(dev, "requesting peripherals failed: %d\n", + error); + return error; + } + + error = devm_add_action(dev, bfin_rotary_free_action, + pdata->pin_list); + if (error) { + dev_err(dev, "setting cleanup action failed: %d\n", + error); + peripheral_free_list(pdata->pin_list); + return error; + } + } + + rotary = devm_kzalloc(dev, sizeof(struct bfin_rot), GFP_KERNEL); + if (!rotary) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + rotary->base = devm_ioremap_resource(dev, res); + if (IS_ERR(rotary->base)) + return PTR_ERR(rotary->base); + + input = devm_input_allocate_device(dev); + if (!input) + return -ENOMEM; + + rotary->input = input; + + rotary->up_key = pdata->rotary_up_key; + rotary->down_key = pdata->rotary_down_key; + rotary->button_key = pdata->rotary_button_key; + rotary->rel_code = pdata->rotary_rel_code; + + rotary->mode = pdata->mode; + rotary->debounce = pdata->debounce; + + input->name = pdev->name; + input->phys = "bfin-rotary/input0"; + input->dev.parent = &pdev->dev; + + input_set_drvdata(input, rotary); + + input->id.bustype = BUS_HOST; + input->id.vendor = 0x0001; + input->id.product = 0x0001; + input->id.version = 0x0100; + + input->open = bfin_rotary_open; + input->close = bfin_rotary_close; + + if (rotary->up_key) { + __set_bit(EV_KEY, input->evbit); + __set_bit(rotary->up_key, input->keybit); + __set_bit(rotary->down_key, input->keybit); + } else { + __set_bit(EV_REL, input->evbit); + __set_bit(rotary->rel_code, input->relbit); + } + + if (rotary->button_key) { + __set_bit(EV_KEY, input->evbit); + __set_bit(rotary->button_key, input->keybit); + } + + /* Quiesce the device before requesting irq */ + bfin_rotary_close(input); + + rotary->irq = platform_get_irq(pdev, 0); + if (rotary->irq < 0) { + dev_err(dev, "No rotary IRQ specified\n"); + return -ENOENT; + } + + error = devm_request_irq(dev, rotary->irq, bfin_rotary_isr, + 0, dev_name(dev), rotary); + if (error) { + dev_err(dev, "unable to claim irq %d; error %d\n", + rotary->irq, error); + return error; + } + + error = input_register_device(input); + if (error) { + dev_err(dev, "unable to register input device (%d)\n", error); + return error; + } + + platform_set_drvdata(pdev, rotary); + device_init_wakeup(&pdev->dev, 1); + + return 0; +} + +static int __maybe_unused bfin_rotary_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct bfin_rot *rotary = platform_get_drvdata(pdev); + + rotary->cnt_config = readw(rotary->base + CNT_CONFIG_OFF); + rotary->cnt_imask = readw(rotary->base + CNT_IMASK_OFF); + rotary->cnt_debounce = readw(rotary->base + CNT_DEBOUNCE_OFF); + + if (device_may_wakeup(&pdev->dev)) + enable_irq_wake(rotary->irq); + + return 0; +} + +static int __maybe_unused bfin_rotary_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct bfin_rot *rotary = platform_get_drvdata(pdev); + + writew(rotary->cnt_debounce, rotary->base + CNT_DEBOUNCE_OFF); + writew(rotary->cnt_imask, rotary->base + CNT_IMASK_OFF); + writew(rotary->cnt_config & ~CNTE, rotary->base + CNT_CONFIG_OFF); + + if (device_may_wakeup(&pdev->dev)) + disable_irq_wake(rotary->irq); + + if (rotary->cnt_config & CNTE) + writew(rotary->cnt_config, rotary->base + CNT_CONFIG_OFF); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(bfin_rotary_pm_ops, + bfin_rotary_suspend, bfin_rotary_resume); + +static struct platform_driver bfin_rotary_device_driver = { + .probe = bfin_rotary_probe, + .driver = { + .name = "bfin-rotary", + .pm = &bfin_rotary_pm_ops, + }, +}; +module_platform_driver(bfin_rotary_device_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Michael Hennerich "); +MODULE_DESCRIPTION("Rotary Counter driver for Blackfin Processors"); +MODULE_ALIAS("platform:bfin-rotary");