diff options
Diffstat (limited to 'drivers/input/keyboard')
| -rw-r--r-- | drivers/input/keyboard/spear-keyboard.c | 46 |
1 files changed, 44 insertions, 2 deletions
diff --git a/drivers/input/keyboard/spear-keyboard.c b/drivers/input/keyboard/spear-keyboard.c index 617a33dc2ef3..72ef01be3360 100644 --- a/drivers/input/keyboard/spear-keyboard.c +++ b/drivers/input/keyboard/spear-keyboard.c @@ -63,6 +63,8 @@ struct spear_kbd { unsigned short last_key; unsigned short keycodes[NUM_ROWS * NUM_COLS]; bool rep; + unsigned int suspended_rate; + u32 mode_ctl_reg; }; static irqreturn_t spear_kbd_interrupt(int irq, void *dev_id) @@ -149,7 +151,7 @@ static int __devinit spear_kbd_parse_dt(struct platform_device *pdev, { struct device_node *np = pdev->dev.of_node; int error; - u32 val; + u32 val, suspended_rate; if (!np) { dev_err(&pdev->dev, "Missing DT data\n"); @@ -159,6 +161,9 @@ static int __devinit spear_kbd_parse_dt(struct platform_device *pdev, if (of_property_read_bool(np, "autorepeat")) kbd->rep = true; + if (of_property_read_u32(np, "suspended_rate", &suspended_rate)) + kbd->suspended_rate = suspended_rate; + error = of_property_read_u32(np, "st,mode", &val); if (error) { dev_err(&pdev->dev, "DT: Invalid or missing mode\n"); @@ -216,6 +221,7 @@ static int __devinit spear_kbd_probe(struct platform_device *pdev) } else { kbd->mode = pdata->mode; kbd->rep = pdata->rep; + kbd->suspended_rate = pdata->suspended_rate; } kbd->res = request_mem_region(res->start, resource_size(res), @@ -317,16 +323,48 @@ static int spear_kbd_suspend(struct device *dev) struct platform_device *pdev = to_platform_device(dev); struct spear_kbd *kbd = platform_get_drvdata(pdev); struct input_dev *input_dev = kbd->input; + unsigned int rate = 0, mode_ctl_reg, val; mutex_lock(&input_dev->mutex); + /* explicitly enable clock as we may program device */ + clk_enable(kbd->clk); + + mode_ctl_reg = readl_relaxed(kbd->io_base + MODE_CTL_REG); + if (device_may_wakeup(&pdev->dev)) { enable_irq_wake(kbd->irq); + + /* + * reprogram the keyboard operating frequency as on some + * platform it may change during system suspended + */ + if (kbd->suspended_rate) + rate = kbd->suspended_rate / 1000000 - 1; + else + rate = clk_get_rate(kbd->clk) / 1000000 - 1; + + val = mode_ctl_reg & + ~(MODE_CTL_PCLK_FREQ_MSK << MODE_CTL_PCLK_FREQ_SHIFT); + val |= (rate & MODE_CTL_PCLK_FREQ_MSK) + << MODE_CTL_PCLK_FREQ_SHIFT; + writel_relaxed(val, kbd->io_base + MODE_CTL_REG); + } else { - if (input_dev->users) + if (input_dev->users) { + writel_relaxed(mode_ctl_reg & ~MODE_CTL_START_SCAN, + kbd->io_base + MODE_CTL_REG); clk_disable(kbd->clk); + } } + /* store current configuration */ + if (input_dev->users) + kbd->mode_ctl_reg = mode_ctl_reg; + + /* restore previous clk state */ + clk_disable(kbd->clk); + mutex_unlock(&input_dev->mutex); return 0; @@ -347,6 +385,10 @@ static int spear_kbd_resume(struct device *dev) clk_enable(kbd->clk); } + /* restore current configuration */ + if (input_dev->users) + writel_relaxed(kbd->mode_ctl_reg, kbd->io_base + MODE_CTL_REG); + mutex_unlock(&input_dev->mutex); return 0; |