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| author |   Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2015-07-20 10:08:17 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2015-07-20 10:08:17 -0700 |
| commit | c57d5621d2f2dc238f4b9c4d00b2a54187a75445 (patch) | |
| tree | ece13738a44545fb110e5d73adbf2625bc7a1ea6 /drivers/input/ff-memless.c | |
| parent | Input: elan_i2c - enable ELAN0600 acpi panels (diff) | |
| parent | Linux 4.2-rc3 (diff) | |
| download | linux-dev-c57d5621d2f2dc238f4b9c4d00b2a54187a75445.tar.xz linux-dev-c57d5621d2f2dc238f4b9c4d00b2a54187a75445.zip | |
Merge tag 'v4.2-rc3' into next
Sync up with Linux 4.2-rc3 to bring in infrastructure (OF) pieces.
Diffstat (limited to 'drivers/input/ff-memless.c')
| -rw-r--r-- | drivers/input/ff-memless.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/input/ff-memless.c b/drivers/input/ff-memless.c index 74c0d8c6002a..fcc6c3368182 100644 --- a/drivers/input/ff-memless.c +++ b/drivers/input/ff-memless.c @@ -237,6 +237,18 @@ static u16 ml_calculate_direction(u16 direction, u16 force, (force + new_force)) << 1; } +#define FRAC_N 8 +static inline s16 fixp_new16(s16 a) +{ + return ((s32)a) >> (16 - FRAC_N); +} + +static inline s16 fixp_mult(s16 a, s16 b) +{ + a = ((s32)a * 0x100) / 0x7fff; + return ((s32)(a * b)) >> FRAC_N; +} + /* * Combine two effects and apply gain. */ @@ -247,7 +259,7 @@ static void ml_combine_effects(struct ff_effect *effect, struct ff_effect *new = state->effect; unsigned int strong, weak, i; int x, y; - fixp_t level; + s16 level; switch (new->type) { case FF_CONSTANT: @@ -255,8 +267,8 @@ static void ml_combine_effects(struct ff_effect *effect, level = fixp_new16(apply_envelope(state, new->u.constant.level, &new->u.constant.envelope)); - x = fixp_mult(fixp_sin(i), level) * gain / 0xffff; - y = fixp_mult(-fixp_cos(i), level) * gain / 0xffff; + x = fixp_mult(fixp_sin16(i), level) * gain / 0xffff; + y = fixp_mult(-fixp_cos16(i), level) * gain / 0xffff; /* * here we abuse ff_ramp to hold x and y of constant force * If in future any driver wants something else than x and y |