[PATCH v8] input: keyboard: Add keys driver for the LPC32xx SoC
Dmitry Torokhov
dmitry.torokhov at gmail.com
Tue Jul 10 02:36:57 EDT 2012
Hi Roland,
On Thu, Jun 28, 2012 at 12:03:16AM +0200, Roland Stigge wrote:
> +
> +struct lpc32xx_kscan_drv {
> + struct input_dev *input;
> + struct clk *clk;
> + void __iomem *kscan_base;
> + u8 lastkeystates[8];
> + u32 io_p_start;
> + u32 io_p_size;
> + u32 matrix_sz; /* Size of matrix in XxY, ie. 3 = 3x3 */
> + unsigned short *keymap; /* Pointer to key map for the scan matrix */
> + u32 deb_clks; /* Debounce clocks (based on 32KHz clock) */
> + u32 scan_delay; /* Scan delay (based on 32KHz clock) */
> + int row_shift;
> +};
> +
> +static void lpc32xx_mod_states(struct lpc32xx_kscan_drv *kscandat, int col)
> +{
> + u8 key;
> + int row;
> + unsigned changed, scancode, keycode;
> +
> + key = readl(LPC32XX_KS_DATA(kscandat->kscan_base, col));
> + changed = key ^ kscandat->lastkeystates[col];
> + if (changed) {
> + for (row = 0; row < kscandat->matrix_sz; row++) {
> + if (changed & (1 << row)) {
I think it could be optimized a bit of you do not scan entire "changed"
but shift it until it reaches 0 instead.
> + of_property_read_u32(np, "nxp,debounce-delay-ms", &kscandat->deb_clks);
> + of_property_read_u32(np, "nxp,scan-delay-ms", &kscandat->scan_delay);
> + if (!kscandat->deb_clks || !kscandat->scan_delay) {
> + dev_err(dev, "debounce or scan delay not specified\n");
> + return -ENXIO;
EINVAL suits better.
> +
> +static int __devexit lpc32xx_kscan_remove(struct platform_device *pdev)
> +{
> + struct lpc32xx_kscan_drv *kscandat = platform_get_drvdata(pdev);
> +
> + kfree(kscandat->keymap);
This seems dangerous in case we manage IRQ fire here.
> + free_irq(platform_get_irq(pdev, 0), pdev);
> + clk_put(kscandat->clk);
> + iounmap(kscandat->kscan_base);
> + release_mem_region(kscandat->io_p_start, kscandat->io_p_size);
> + input_unregister_device(kscandat->input);
> + kfree(kscandat);
> +
> + return 0;
> +}
> +
Does the following patch (on top of your) still work with your device?
Thanks.
--
Dmitry
Input: lpc32-xx- misc changes
From: Dmitry Torokhov <dmitry.torokhov at gmail.com>
Signed-off-by: Dmitry Torokhov <dtor at mail.ru>
---
drivers/input/keyboard/lpc32xx-keys.c | 241 +++++++++++++++++----------------
1 file changed, 126 insertions(+), 115 deletions(-)
diff --git a/drivers/input/keyboard/lpc32xx-keys.c b/drivers/input/keyboard/lpc32xx-keys.c
index d51a4c5..e8f2112 100644
--- a/drivers/input/keyboard/lpc32xx-keys.c
+++ b/drivers/input/keyboard/lpc32xx-keys.c
@@ -66,47 +66,46 @@
struct lpc32xx_kscan_drv {
struct input_dev *input;
struct clk *clk;
+ struct resource *iores;
void __iomem *kscan_base;
- u8 lastkeystates[8];
- u32 io_p_start;
- u32 io_p_size;
+ unsigned int irq;
+
u32 matrix_sz; /* Size of matrix in XxY, ie. 3 = 3x3 */
- unsigned short *keymap; /* Pointer to key map for the scan matrix */
u32 deb_clks; /* Debounce clocks (based on 32KHz clock) */
u32 scan_delay; /* Scan delay (based on 32KHz clock) */
- int row_shift;
+
+ unsigned short *keymap; /* Pointer to key map for the scan matrix */
+ unsigned int row_shift;
+
+ u8 lastkeystates[8];
};
static void lpc32xx_mod_states(struct lpc32xx_kscan_drv *kscandat, int col)
{
+ struct input_dev *input = kscandat->input;
+ unsigned row, changed, scancode, keycode;
u8 key;
- int row;
- unsigned changed, scancode, keycode;
key = readl(LPC32XX_KS_DATA(kscandat->kscan_base, col));
changed = key ^ kscandat->lastkeystates[col];
- if (changed) {
- for (row = 0; row < kscandat->matrix_sz; row++) {
- if (changed & (1 << row)) {
- /* Key state changed, signal an event */
- scancode = MATRIX_SCAN_CODE(
- row, col, kscandat->row_shift);
- keycode = kscandat->keymap[scancode];
- input_event(kscandat->input, EV_MSC, MSC_SCAN,
- scancode);
- input_report_key(kscandat->input, keycode,
- key & (1 << row));
- }
+ kscandat->lastkeystates[col] = key;
+
+ for (row = 0; changed; row++, changed >>= 1) {
+ if (changed & 1) {
+ /* Key state changed, signal an event */
+ scancode = MATRIX_SCAN_CODE(row, col,
+ kscandat->row_shift);
+ keycode = kscandat->keymap[scancode];
+ input_event(input, EV_MSC, MSC_SCAN, scancode);
+ input_report_key(input, keycode, key & (1 << row));
}
-
- kscandat->lastkeystates[col] = key;
}
}
static irqreturn_t lpc32xx_kscan_irq(int irq, void *dev_id)
{
- int i;
struct lpc32xx_kscan_drv *kscandat = dev_id;
+ int i;
for (i = 0; i < kscandat->matrix_sz; i++)
lpc32xx_mod_states(kscandat, i);
@@ -126,7 +125,9 @@ static int lpc32xx_kscan_open(struct input_dev *dev)
error = clk_prepare_enable(kscandat->clk);
if (error)
return error;
+
writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
+
return 0;
}
@@ -142,7 +143,7 @@ static int lpc32xx_parse_dt(struct lpc32xx_kscan_drv *kscandat)
{
struct device *dev = &kscandat->input->dev;
struct device_node *np = dev->parent->of_node;
- u32 rows, columns;
+ u32 rows = 0, columns = 0;
of_property_read_u32(np, "keypad,num-rows", &rows);
of_property_read_u32(np, "keypad,num-columns", &columns);
@@ -159,7 +160,7 @@ static int lpc32xx_parse_dt(struct lpc32xx_kscan_drv *kscandat)
of_property_read_u32(np, "nxp,scan-delay-ms", &kscandat->scan_delay);
if (!kscandat->deb_clks || !kscandat->scan_delay) {
dev_err(dev, "debounce or scan delay not specified\n");
- return -ENXIO;
+ return -EINVAL;
}
return 0;
@@ -168,107 +169,104 @@ static int lpc32xx_parse_dt(struct lpc32xx_kscan_drv *kscandat)
static int __devinit lpc32xx_kscan_probe(struct platform_device *pdev)
{
struct lpc32xx_kscan_drv *kscandat;
+ struct input_dev *input;
struct resource *res;
+ size_t keymap_size;
int error;
int irq;
- kscandat = kzalloc(sizeof(struct lpc32xx_kscan_drv), GFP_KERNEL);
- if (!kscandat) {
- dev_err(&pdev->dev, "failed to allocate memory\n");
- return -ENOMEM;
- }
-
- kscandat->input = input_allocate_device();
- if (kscandat->input == NULL) {
- dev_err(&pdev->dev, "failed to allocate device\n");
- error = -ENOMEM;
- goto out1;
- }
-
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "failed to get platform I/O memory\n");
- error = -EBUSY;
- goto out2;
- }
-
- res = request_mem_region(res->start, resource_size(res), pdev->name);
- if (!res) {
- dev_err(&pdev->dev, "failed to request I/O memory\n");
- error = -EBUSY;
- goto out2;
- }
- kscandat->io_p_start = res->start;
- kscandat->io_p_size = resource_size(res);
-
- kscandat->kscan_base = ioremap(res->start, resource_size(res));
- if (!kscandat->kscan_base) {
- dev_err(&pdev->dev, "failed to remap I/O memory\n");
- error = -EBUSY;
- goto out3;
- }
-
- /* Get the key scanner clock */
- kscandat->clk = clk_get(&pdev->dev, NULL);
- if (IS_ERR(kscandat->clk)) {
- dev_err(&pdev->dev, "failed to get clock\n");
- error = PTR_ERR(kscandat->clk);
- goto out4;
+ return -EINVAL;
}
irq = platform_get_irq(pdev, 0);
- if ((irq < 0) || (irq >= NR_IRQS)) {
+ if (irq < 0 || irq >= NR_IRQS) {
dev_err(&pdev->dev, "failed to get platform irq\n");
- error = -EINVAL;
- goto out5;
- }
- error = request_irq(irq, lpc32xx_kscan_irq, 0, pdev->name, kscandat);
- if (error) {
- dev_err(&pdev->dev, "failed to request irq\n");
- goto out5;
+ return -EINVAL;
}
- platform_set_drvdata(pdev, kscandat);
-
- /* Setup key input */
- kscandat->input->evbit[0] = BIT_MASK(EV_KEY);
- kscandat->input->name = pdev->name;
- kscandat->input->phys = "matrix-keys/input0";
- kscandat->input->id.vendor = 0x0001;
- kscandat->input->id.product = 0x0001;
- kscandat->input->id.version = 0x0100;
- kscandat->input->open = lpc32xx_kscan_open;
- kscandat->input->close = lpc32xx_kscan_close;
- kscandat->input->dev.parent = &pdev->dev;
+ kscandat = kzalloc(sizeof(struct lpc32xx_kscan_drv), GFP_KERNEL);
+ if (!kscandat) {
+ dev_err(&pdev->dev, "failed to allocate memory\n");
+ return -ENOMEM;
+ }
error = lpc32xx_parse_dt(kscandat);
if (error) {
dev_err(&pdev->dev, "failed to parse device tree\n");
- goto out6;
+ goto err_free_mem;
}
- kscandat->keymap = kzalloc(sizeof(kscandat->keymap[0]) *
- (kscandat->matrix_sz << kscandat->row_shift),
- GFP_KERNEL);
+ keymap_size = sizeof(kscandat->keymap[0]) *
+ (kscandat->matrix_sz << kscandat->row_shift);
+ kscandat->keymap = kzalloc(keymap_size, GFP_KERNEL);
if (!kscandat->keymap) {
dev_err(&pdev->dev, "could not allocate memory for keymap\n");
error = -ENOMEM;
- goto out6;
+ goto err_free_mem;
+ }
+
+ kscandat->input = input = input_allocate_device();
+ if (!input) {
+ dev_err(&pdev->dev, "failed to allocate input device\n");
+ error = -ENOMEM;
+ goto err_free_keymap;
}
- error = matrix_keypad_build_keymap(NULL, NULL, kscandat->matrix_sz,
+ /* Setup key input */
+ input->name = pdev->name;
+ input->phys = "lpc32xx/input0";
+ input->id.vendor = 0x0001;
+ input->id.product = 0x0001;
+ input->id.version = 0x0100;
+ input->open = lpc32xx_kscan_open;
+ input->close = lpc32xx_kscan_close;
+ input->dev.parent = &pdev->dev;
+
+ input_set_capability(kscandat->input, EV_MSC, MSC_SCAN);
+
+ error = matrix_keypad_build_keymap(NULL, NULL,
+ kscandat->matrix_sz,
kscandat->matrix_sz,
kscandat->keymap, kscandat->input);
if (error) {
dev_err(&pdev->dev, "failed to build keymap\n");
- goto out7;
+ goto err_free_input;
}
input_set_drvdata(kscandat->input, kscandat);
- input_set_capability(kscandat->input, EV_MSC, MSC_SCAN);
+
+ kscandat->iores = request_mem_region(res->start, resource_size(res),
+ pdev->name);
+ if (!kscandat->iores) {
+ dev_err(&pdev->dev, "failed to request I/O memory\n");
+ error = -EBUSY;
+ goto err_free_input;
+ }
+
+ kscandat->kscan_base = ioremap(kscandat->iores->start,
+ resource_size(kscandat->iores));
+ if (!kscandat->kscan_base) {
+ dev_err(&pdev->dev, "failed to remap I/O memory\n");
+ error = -EBUSY;
+ goto err_release_memregion;
+ }
+
+ /* Get the key scanner clock */
+ kscandat->clk = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(kscandat->clk)) {
+ dev_err(&pdev->dev, "failed to get clock\n");
+ error = PTR_ERR(kscandat->clk);
+ goto err_unmap;
+ }
/* Configure the key scanner */
- clk_prepare_enable(kscandat->clk);
+ error = clk_prepare_enable(kscandat->clk);
+ if (error)
+ goto err_clk_put;
+
writel(kscandat->deb_clks, LPC32XX_KS_DEB(kscandat->kscan_base));
writel(kscandat->scan_delay, LPC32XX_KS_SCAN_CTL(kscandat->kscan_base));
writel(LPC32XX_KSCAN_FTST_USE32K_CLK,
@@ -278,27 +276,35 @@ static int __devinit lpc32xx_kscan_probe(struct platform_device *pdev)
writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
clk_disable_unprepare(kscandat->clk);
+ error = request_irq(irq, lpc32xx_kscan_irq, 0, pdev->name, kscandat);
+ if (error) {
+ dev_err(&pdev->dev, "failed to request irq\n");
+ goto err_clk_put;
+ }
+
error = input_register_device(kscandat->input);
if (error) {
dev_err(&pdev->dev, "failed to register input device\n");
- goto out7;
+ goto err_free_irq;
}
+ platform_set_drvdata(pdev, kscandat);
return 0;
-out7:
- kfree(kscandat->keymap);
-out6:
- free_irq(irq, pdev);
-out5:
+err_free_irq:
+ free_irq(irq, kscandat);
+err_clk_put:
clk_put(kscandat->clk);
-out4:
+err_unmap:
iounmap(kscandat->kscan_base);
-out3:
- release_mem_region(kscandat->io_p_start, kscandat->io_p_size);
-out2:
+err_release_memregion:
+ release_mem_region(kscandat->iores->start,
+ resource_size(kscandat->iores));
+err_free_input:
input_free_device(kscandat->input);
-out1:
+err_free_keymap:
+ kfree(kscandat->keymap);
+err_free_mem:
kfree(kscandat);
return error;
@@ -308,12 +314,13 @@ static int __devexit lpc32xx_kscan_remove(struct platform_device *pdev)
{
struct lpc32xx_kscan_drv *kscandat = platform_get_drvdata(pdev);
- kfree(kscandat->keymap);
- free_irq(platform_get_irq(pdev, 0), pdev);
+ free_irq(platform_get_irq(pdev, 0), kscandat);
clk_put(kscandat->clk);
iounmap(kscandat->kscan_base);
- release_mem_region(kscandat->io_p_start, kscandat->io_p_size);
+ release_mem_region(kscandat->iores->start,
+ resource_size(kscandat->iores));
input_unregister_device(kscandat->input);
+ kfree(kscandat->keymap);
kfree(kscandat);
return 0;
@@ -324,16 +331,17 @@ static int lpc32xx_kscan_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct lpc32xx_kscan_drv *kscandat = platform_get_drvdata(pdev);
+ struct input_dev *input = kscandat->input;
- mutex_lock(&kscandat->input->mutex);
+ mutex_lock(&input->mutex);
- if (kscandat->input->users) {
+ if (input->users) {
/* Clear IRQ and disable clock */
writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
clk_disable_unprepare(kscandat->clk);
}
- mutex_unlock(&kscandat->input->mutex);
+ mutex_unlock(&input->mutex);
return 0;
}
@@ -341,17 +349,20 @@ static int lpc32xx_kscan_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct lpc32xx_kscan_drv *kscandat = platform_get_drvdata(pdev);
+ struct input_dev *input = kscandat->input;
+ int retval = 0;
- mutex_lock(&kscandat->input->mutex);
+ mutex_lock(&input->mutex);
- if (kscandat->input->users) {
+ if (input->users) {
/* Enable clock and clear IRQ */
- clk_prepare_enable(kscandat->clk);
- writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
+ retval = clk_prepare_enable(kscandat->clk);
+ if (retval == 0)
+ writel(1, LPC32XX_KS_IRQ(kscandat->kscan_base));
}
- mutex_unlock(&kscandat->input->mutex);
- return 0;
+ mutex_unlock(&input->mutex);
+ return retval;
}
#endif
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