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authorLee Jones <lee.jones@linaro.org>2012-11-05 16:10:30 +0100
committerSamuel Ortiz <sameo@linux.intel.com>2012-11-11 23:35:03 +0100
commit7da0cbfc54c82eec793ff3d1b23b7a25406c6dba (patch)
tree59548dc5476e9e94f4c7d9ad7ed4f16414ad181b /drivers/mfd/stmpe.c
parent8ae754ebd5edffa0b2a2bafa4879a9ace01d5477 (diff)
downloadlinux-7da0cbfc54c82eec793ff3d1b23b7a25406c6dba.tar.bz2
mfd: Prevent STMPE from abusing mfd_add_devices' irq_base parameter
Originally IRQ incrementers were provided in some template resource structures for keypad and touchscreen devices. These were passed as IORESOURCE_IRQs to MFD core in the usual way. The true device IRQs were instead added to the irq_base when mfd_add_devices was invoked. This is clearly an abuse of the call, and does not scale when IRQ Domains are brought into play. Before we can provide the STMPE with its own IRQ Domain we must first fix this. This patche keeps most of the driver's structure, keeping the template strategy. However, instead of providing the IRQ as an increment to irq_base, we dynamically populate the IORESOURCE_IRQ with the correct device IRQ. Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd/stmpe.c')
-rw-r--r--drivers/mfd/stmpe.c25
1 files changed, 13 insertions, 12 deletions
diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
index c94f521f392c..ad13cb00a749 100644
--- a/drivers/mfd/stmpe.c
+++ b/drivers/mfd/stmpe.c
@@ -310,14 +310,10 @@ static struct mfd_cell stmpe_gpio_cell_noirq = {
static struct resource stmpe_keypad_resources[] = {
{
.name = "KEYPAD",
- .start = 0,
- .end = 0,
.flags = IORESOURCE_IRQ,
},
{
.name = "KEYPAD_OVER",
- .start = 1,
- .end = 1,
.flags = IORESOURCE_IRQ,
},
};
@@ -397,14 +393,10 @@ static struct stmpe_variant_info stmpe801_noirq = {
static struct resource stmpe_ts_resources[] = {
{
.name = "TOUCH_DET",
- .start = 0,
- .end = 0,
.flags = IORESOURCE_IRQ,
},
{
.name = "FIFO_TH",
- .start = 1,
- .end = 1,
.flags = IORESOURCE_IRQ,
},
};
@@ -959,10 +951,10 @@ static int __devinit stmpe_chip_init(struct stmpe *stmpe)
}
static int __devinit stmpe_add_device(struct stmpe *stmpe,
- struct mfd_cell *cell, int irq)
+ struct mfd_cell *cell)
{
return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1,
- NULL, stmpe->irq_base + irq, NULL);
+ NULL, stmpe->irq_base, NULL);
}
static int __devinit stmpe_devices_init(struct stmpe *stmpe)
@@ -970,7 +962,7 @@ static int __devinit stmpe_devices_init(struct stmpe *stmpe)
struct stmpe_variant_info *variant = stmpe->variant;
unsigned int platform_blocks = stmpe->pdata->blocks;
int ret = -EINVAL;
- int i;
+ int i, j;
for (i = 0; i < variant->num_blocks; i++) {
struct stmpe_variant_block *block = &variant->blocks[i];
@@ -978,8 +970,17 @@ static int __devinit stmpe_devices_init(struct stmpe *stmpe)
if (!(platform_blocks & block->block))
continue;
+ for (j = 0; j < block->cell->num_resources; j++) {
+ struct resource *res =
+ (struct resource *) &block->cell->resources[j];
+
+ /* Dynamically fill in a variant's IRQ. */
+ if (res->flags & IORESOURCE_IRQ)
+ res->start = res->end = block->irq + j;
+ }
+
platform_blocks &= ~block->block;
- ret = stmpe_add_device(stmpe, block->cell, block->irq);
+ ret = stmpe_add_device(stmpe, block->cell);
if (ret)
return ret;
}