misc: add pca9552 LED blinker model

Specs are available here :

    https://www.nxp.com/docs/en/application-note/AN264.pdf

This is a simple model supporting the basic registers for led and GPIO
mode. The device also supports two blinking rates but not the model
yet.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20180530064049.27976-7-clg@kaod.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 64 insertions, 0 deletions

diff --git a/include/hw/misc/pca9552.h b/include/hw/misc/pca9552.h
new file mode 100644
index 0000000000..ebb43c63fe
--- /dev/null
+++ b/include/hw/misc/pca9552.h
@@ -0,0 +1,32 @@
+/*
+ * PCA9552 I2C LED blinker
+ *
+ * Copyright (c) 2017-2018, IBM Corporation.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later. See the COPYING file in the top-level directory.
+ */
+#ifndef PCA9552_H
+#define PCA9552_H
+
+#include "hw/i2c/i2c.h"
+
+#define TYPE_PCA9552 "pca9552"
+#define PCA9552(obj) OBJECT_CHECK(PCA9552State, (obj), TYPE_PCA9552)
+
+#define PCA9552_NR_REGS 10
+
+typedef struct PCA9552State {
+    /*< private >*/
+    I2CSlave i2c;
+    /*< public >*/
+
+    uint8_t len;
+    uint8_t pointer;
+
+    uint8_t regs[PCA9552_NR_REGS];
+    uint8_t max_reg;
+    uint8_t nr_leds;
+} PCA9552State;
+
+#endif
diff --git a/include/hw/misc/pca9552_regs.h b/include/hw/misc/pca9552_regs.h
new file mode 100644
index 0000000000..d8051cfbd6
--- /dev/null
+++ b/include/hw/misc/pca9552_regs.h
@@ -0,0 +1,32 @@
+/*
+ * PCA9552 I2C LED blinker registers
+ *
+ * Copyright (c) 2017-2018, IBM Corporation.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later. See the COPYING file in the top-level directory.
+ */
+#ifndef PCA9552_REGS_H
+#define PCA9552_REGS_H
+
+/*
+ * Bits [0:3] are used to address a specific register.
+ */
+#define PCA9552_INPUT0   0 /* read only input register 0 */
+#define PCA9552_INPUT1   1 /* read only input register 1  */
+#define PCA9552_PSC0     2 /* read/write frequency prescaler 0 */
+#define PCA9552_PWM0     3 /* read/write PWM register 0 */
+#define PCA9552_PSC1     4 /* read/write frequency prescaler 1 */
+#define PCA9552_PWM1     5 /* read/write PWM register 1 */
+#define PCA9552_LS0      6 /* read/write LED0 to LED3 selector */
+#define PCA9552_LS1      7 /* read/write LED4 to LED7 selector */
+#define PCA9552_LS2      8 /* read/write LED8 to LED11 selector */
+#define PCA9552_LS3      9 /* read/write LED12 to LED15 selector */
+
+/*
+ * Bit [4] is used to activate the Auto-Increment option of the
+ * register address
+ */
+#define PCA9552_AUTOINC  (1 << 4)
+
+#endif