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| author | Daniel Ribeiro <drwyrm@gmail.com> | 2009-06-27 00:17:20 -0300 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2009-09-17 09:46:47 +0200 |
| commit | e9a22635b0d794d0cb242ffb0249f7b2a410bca2 (patch) | |
| tree | cb3447e0a44f5d1478d93b11476493031ccb59ee /drivers/mfd/ezx-pcap.c | |
| parent | b1148fd46c248c8f6c9f3beb79f27cdd83702621 (diff) | |
| download | linux-e9a22635b0d794d0cb242ffb0249f7b2a410bca2.tar.gz linux-e9a22635b0d794d0cb242ffb0249f7b2a410bca2.tar.bz2 linux-e9a22635b0d794d0cb242ffb0249f7b2a410bca2.zip | |
mfd: add ezx_pcap_setbits
Provides an atomic set_bits functions, as needed by the pcap-regulator
driver.
Signed-off-by: Daniel Ribeiro <drwyrm@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd/ezx-pcap.c')
| -rw-r--r-- | drivers/mfd/ezx-pcap.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/mfd/ezx-pcap.c b/drivers/mfd/ezx-pcap.c index 732664f238fe..86d394894d81 100644 --- a/drivers/mfd/ezx-pcap.c +++ b/drivers/mfd/ezx-pcap.c @@ -107,6 +107,29 @@ int ezx_pcap_read(struct pcap_chip *pcap, u8 reg_num, u32 *value) } EXPORT_SYMBOL_GPL(ezx_pcap_read); +int ezx_pcap_set_bits(struct pcap_chip *pcap, u8 reg_num, u32 mask, u32 val) +{ + int ret; + u32 tmp = PCAP_REGISTER_READ_OP_BIT | + (reg_num << PCAP_REGISTER_ADDRESS_SHIFT); + + mutex_lock(&pcap->io_mutex); + ret = ezx_pcap_putget(pcap, &tmp); + if (ret) + goto out_unlock; + + tmp &= (PCAP_REGISTER_VALUE_MASK & ~mask); + tmp |= (val & mask) | PCAP_REGISTER_WRITE_OP_BIT | + (reg_num << PCAP_REGISTER_ADDRESS_SHIFT); + + ret = ezx_pcap_putget(pcap, &tmp); +out_unlock: + mutex_unlock(&pcap->io_mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(ezx_pcap_set_bits); + /* IRQ */ int irq_to_pcap(struct pcap_chip *pcap, int irq) { |