diff options
Diffstat (limited to 'drivers/mfd/stmpe.c')
| -rw-r--r-- | drivers/mfd/stmpe.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c index a7f3099fdcf..0754c5e9199 100644 --- a/drivers/mfd/stmpe.c +++ b/drivers/mfd/stmpe.c @@ -455,6 +455,67 @@ static struct stmpe_variant_block stmpe1601_blocks[] = { }, }; +/* supported autosleep timeout delay (in msecs) */ +static const int stmpe_autosleep_delay[] = { + 4, 16, 32, 64, 128, 256, 512, 1024, +}; + +static int stmpe_round_timeout(int timeout) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(stmpe_autosleep_delay); i++) { + if (stmpe_autosleep_delay[i] >= timeout) + return i; + } + + /* + * requests for delays longer than supported should not return the + * longest supported delay + */ + return -EINVAL; +} + +static int stmpe_autosleep(struct stmpe *stmpe, int autosleep_timeout) +{ + int ret; + + if (!stmpe->variant->enable_autosleep) + return -ENOSYS; + + mutex_lock(&stmpe->lock); + ret = stmpe->variant->enable_autosleep(stmpe, autosleep_timeout); + mutex_unlock(&stmpe->lock); + + return ret; +} + +/* + * Both stmpe 1601/2403 support same layout for autosleep + */ +static int stmpe1601_autosleep(struct stmpe *stmpe, + int autosleep_timeout) +{ + int ret, timeout; + + /* choose the best available timeout */ + timeout = stmpe_round_timeout(autosleep_timeout); + if (timeout < 0) { + dev_err(stmpe->dev, "invalid timeout\n"); + return timeout; + } + + ret = __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2, + STMPE1601_AUTOSLEEP_TIMEOUT_MASK, + timeout); + if (ret < 0) + return ret; + + return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2, + STPME1601_AUTOSLEEP_ENABLE, + STPME1601_AUTOSLEEP_ENABLE); +} + static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks, bool enable) { @@ -497,6 +558,7 @@ static struct stmpe_variant_info stmpe1601 = { .num_irqs = STMPE1601_NR_INTERNAL_IRQS, .enable = stmpe1601_enable, .get_altfunc = stmpe1601_get_altfunc, + .enable_autosleep = stmpe1601_autosleep, }; /* @@ -589,6 +651,7 @@ static struct stmpe_variant_info stmpe2403 = { .num_irqs = STMPE24XX_NR_INTERNAL_IRQS, .enable = stmpe24xx_enable, .get_altfunc = stmpe24xx_get_altfunc, + .enable_autosleep = stmpe1601_autosleep, /* same as stmpe1601 */ }; static struct stmpe_variant_info *stmpe_variant_info[] = { @@ -731,6 +794,7 @@ static void stmpe_irq_remove(struct stmpe *stmpe) static int __devinit stmpe_chip_init(struct stmpe *stmpe) { unsigned int irq_trigger = stmpe->pdata->irq_trigger; + int autosleep_timeout = stmpe->pdata->autosleep_timeout; struct stmpe_variant_info *variant = stmpe->variant; u8 icr = STMPE_ICR_LSB_GIM; unsigned int id; @@ -766,6 +830,12 @@ static int __devinit stmpe_chip_init(struct stmpe *stmpe) if (stmpe->pdata->irq_invert_polarity) icr ^= STMPE_ICR_LSB_HIGH; + if (stmpe->pdata->autosleep) { + ret = stmpe_autosleep(stmpe, autosleep_timeout); + if (ret) + return ret; + } + return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr); } |