From: Glenn Miles <milesg@linux.vnet.ibm.com>
To: qemu-devel@nongnu.org, qemu-ppc@nongnu.org
Cc: "Glenn Miles" <milesg@linux.vnet.ibm.com>,
"Cédric Le Goater" <clg@kaod.org>,
"Nicholas Piggin" <npiggin@gmail.com>,
"Frédéric Barrat" <fbarrat@linux.ibm.com>,
"Reza Arbab" <arbab@linux.ibm.com>,
"Andrew Jeffery" <andrew@codeconstruct.com.au>
Subject: [PATCH v7 1/9] misc/pca9552: Fix inverted input status
Date: Thu, 25 Jan 2024 16:48:10 -0600 [thread overview]
Message-ID: <20240125224818.146499-2-milesg@linux.vnet.ibm.com> (raw)
In-Reply-To: <20240125224818.146499-1-milesg@linux.vnet.ibm.com>
The pca9552 INPUT0 and INPUT1 registers are supposed to
hold the logical values of the LED pins. A logical 0
should be seen in the INPUT0/1 registers for a pin when
its corresponding LSn bits are set to 0, which is also
the state needed for turning on an LED in a typical
usage scenario. Existing code was doing the opposite
and setting INPUT0/1 bit to a 1 when the LSn bit was
set to 0, so this commit fixes that.
Reviewed-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Signed-off-by: Glenn Miles <milesg@linux.vnet.ibm.com>
---
No changes from previous version
hw/misc/pca9552.c | 18 +++++++++++++-----
tests/qtest/pca9552-test.c | 6 +++---
2 files changed, 16 insertions(+), 8 deletions(-)
diff --git a/hw/misc/pca9552.c b/hw/misc/pca9552.c
index 72b653463f..f00a149d61 100644
--- a/hw/misc/pca9552.c
+++ b/hw/misc/pca9552.c
@@ -36,7 +36,10 @@ typedef struct PCA955xClass PCA955xClass;
DECLARE_CLASS_CHECKERS(PCA955xClass, PCA955X,
TYPE_PCA955X)
-
+/*
+ * Note: The LED_ON and LED_OFF configuration values for the PCA955X
+ * chips are the reverse of the PCA953X family of chips.
+ */
#define PCA9552_LED_ON 0x0
#define PCA9552_LED_OFF 0x1
#define PCA9552_LED_PWM0 0x2
@@ -112,13 +115,18 @@ static void pca955x_update_pin_input(PCA955xState *s)
switch (config) {
case PCA9552_LED_ON:
- qemu_set_irq(s->gpio[i], 1);
- s->regs[input_reg] |= 1 << input_shift;
- break;
- case PCA9552_LED_OFF:
+ /* Pin is set to 0V to turn on LED */
qemu_set_irq(s->gpio[i], 0);
s->regs[input_reg] &= ~(1 << input_shift);
break;
+ case PCA9552_LED_OFF:
+ /*
+ * Pin is set to Hi-Z to turn off LED and
+ * pullup sets it to a logical 1.
+ */
+ qemu_set_irq(s->gpio[i], 1);
+ s->regs[input_reg] |= 1 << input_shift;
+ break;
case PCA9552_LED_PWM0:
case PCA9552_LED_PWM1:
/* TODO */
diff --git a/tests/qtest/pca9552-test.c b/tests/qtest/pca9552-test.c
index d80ed93cd3..ccca2b3d91 100644
--- a/tests/qtest/pca9552-test.c
+++ b/tests/qtest/pca9552-test.c
@@ -60,7 +60,7 @@ static void send_and_receive(void *obj, void *data, QGuestAllocator *alloc)
g_assert_cmphex(value, ==, 0x55);
value = i2c_get8(i2cdev, PCA9552_INPUT0);
- g_assert_cmphex(value, ==, 0x0);
+ g_assert_cmphex(value, ==, 0xFF);
pca9552_init(i2cdev);
@@ -68,13 +68,13 @@ static void send_and_receive(void *obj, void *data, QGuestAllocator *alloc)
g_assert_cmphex(value, ==, 0x54);
value = i2c_get8(i2cdev, PCA9552_INPUT0);
- g_assert_cmphex(value, ==, 0x01);
+ g_assert_cmphex(value, ==, 0xFE);
value = i2c_get8(i2cdev, PCA9552_LS3);
g_assert_cmphex(value, ==, 0x54);
value = i2c_get8(i2cdev, PCA9552_INPUT1);
- g_assert_cmphex(value, ==, 0x10);
+ g_assert_cmphex(value, ==, 0xEF);
}
static void pca9552_register_nodes(void)
--
2.31.1
next prev parent reply other threads:[~2024-01-25 22:50 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-25 22:48 [PATCH v7 0/9] Add powernv10 I2C devices and tests Glenn Miles
2024-01-25 22:48 ` Glenn Miles [this message]
2024-01-25 22:48 ` [PATCH v7 2/9] misc/pca9552: Let external devices set pca9552 inputs Glenn Miles
2024-01-25 22:48 ` [PATCH v7 3/9] ppc/pnv: New powernv10-rainier machine type Glenn Miles
2024-01-25 22:48 ` [PATCH v7 4/9] ppc/pnv: Add pca9552 to powernv10-rainier for PCIe hotplug power control Glenn Miles
2024-01-25 22:48 ` [PATCH v7 5/9] ppc/pnv: Wire up pca9552 GPIO pins " Glenn Miles
2024-01-25 22:48 ` [PATCH v7 6/9] ppc/pnv: Use resettable interface to reset child I2C buses Glenn Miles
2024-01-25 22:48 ` [PATCH v7 7/9] misc: Add a pca9554 GPIO device model Glenn Miles
2024-03-04 22:32 ` Paolo Bonzini
2024-03-05 6:20 ` Cédric Le Goater
2024-03-05 17:03 ` Miles Glenn
2024-03-05 23:38 ` Paolo Bonzini
2024-01-25 22:48 ` [PATCH v7 8/9] ppc/pnv: Add a pca9554 I2C device to powernv10-rainier Glenn Miles
2024-01-25 22:48 ` [PATCH v7 9/9] ppc/pnv: Test pnv i2c master and connected devices Glenn Miles
2024-01-26 7:52 ` Cédric Le Goater
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