Newer RMI functions make use of packet registers. Packet registers contain
several bytes of data at a RMI address instead of just a single byte.
Packet registers may also contain subpackets which may or may not be
present for a given firmware configuration. Functions which use packet
registers contain Packet Register Descriptors in their query registers.
This patch implements the reading and processing of packet register
descriptors.
Signed-off-by: Andrew Duggan <aduggan@xxxxxxxxxxxxx>
---
drivers/input/rmi4/rmi_driver.c | 188 ++++++++++++++++++++++++++++++++++++++++
drivers/input/rmi4/rmi_driver.h | 38 ++++++++
2 files changed, 226 insertions(+)
diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c
index 54852a0..328a0e5 100644
--- a/drivers/input/rmi4/rmi_driver.c
+++ b/drivers/input/rmi4/rmi_driver.c
@@ -548,6 +548,194 @@ static int rmi_scan_pdt(struct rmi_device *rmi_dev, void *ctx,
return retval < 0 ? retval : 0;
}
+
+int rmi_read_register_desc(struct rmi_device *d, u16 addr,
+ struct rmi_register_descriptor *rdesc)
+{
+ int ret;
+ u8 size_presence_reg;
+ u8 buf[35];
+ int presense_offset = 1;
+ u8 *struct_buf;
+ int reg;
+ int offset = 0;
+ int map_offset = 0;
+ int i;
+ int b;
+
+ /*
+ * The first register of the register descriptor is the size of
+ * the register descriptor's presense register.
+ */
+ ret = rmi_read(d, addr, &size_presence_reg);
+ if (ret)
+ return ret;
+ ++addr;
+
+ if (size_presence_reg < 0 || size_presence_reg > 35)
+ /* sanity check the value */
+ return -EIO;
+
+ memset(buf, 0, sizeof(buf));
+
+ /*
+ * The presence register contains the size of the register structure
+ * and a bitmap which identified which packet registers are present
+ * for this particular register type (ie query, control, or data).
+ */
+ ret = rmi_read_block(d, addr, buf, size_presence_reg);
+ if (ret)
+ return ret;
+ ++addr;
+
+ if (buf[0] == 0) {
+ presense_offset = 3;
+ rdesc->struct_size = buf[1] | (buf[2] << 8);
+ } else {
+ rdesc->struct_size = buf[0];
+ }
+
+ for (i = presense_offset; i < size_presence_reg; i++) {
+ for (b = 0; b < 8; b++) {
+ if (buf[i] & (0x1 << b))
+ bitmap_set(rdesc->presense_map, map_offset, 1);
+ ++map_offset;
+ }
+ }
+
+ rdesc->num_registers = bitmap_weight(rdesc->presense_map,
+ RMI_REG_DESC_PRESENSE_BITS);
+
+ rdesc->registers = devm_kzalloc(&d->dev, rdesc->num_registers *
+ sizeof(struct rmi_register_desc_item),
+ GFP_KERNEL);
+ if (!rdesc->registers)
+ return -ENOMEM;
+
+ /*
+ * Allocate a temporary buffer to hold the register structure.
+ * I'm not using devm_kzalloc here since it will not be retained
+ * after exiting this function
+ */
+ struct_buf = kzalloc(rdesc->struct_size, GFP_KERNEL);
+ if (!struct_buf)
+ return -ENOMEM;
+
+ /*
+ * The register structure contains information about every packet
+ * register of this type. This includes the size of the packet
+ * register and a bitmap of all subpackets contained in the packet
+ * register.
+ */
+ ret = rmi_read_block(d, addr, struct_buf, rdesc->struct_size);
+ if (ret)
+ goto free_struct_buff;
+
+ reg = find_first_bit(rdesc->presense_map, RMI_REG_DESC_PRESENSE_BITS);
+ map_offset = 0;
+ for (i = 0; i < rdesc->num_registers; i++) {
+ struct rmi_register_desc_item *item = &rdesc->registers[i];
+ int reg_size = struct_buf[offset];
+
+ ++offset;
+ if (reg_size == 0) {
+ reg_size = struct_buf[offset] |
+ (struct_buf[offset + 1] << 8);
+ offset += 2;
+ }
+
+ if (reg_size == 0) {
+ reg_size = struct_buf[offset] |
+ (struct_buf[offset + 1] << 8) |
+ (struct_buf[offset + 2] << 16) |
+ (struct_buf[offset + 3] << 24);
+ offset += 4;
+ }
+
+ item->reg = reg;
+ item->reg_size = reg_size;
+
+ do {
+ for (b = 0; b < 7; b++) {
+ if (struct_buf[offset] & (0x1 << b))
+ bitmap_set(item->subpacket_map,
+ map_offset, 1);
+ ++map_offset;
+ }
+ } while (struct_buf[offset++] & 0x80);
+
+ item->num_subpackets = bitmap_weight(item->subpacket_map,
+ RMI_REG_DESC_SUBPACKET_BITS);
+
+ dev_dbg(&d->dev, "%s: reg: %d reg size: %ld subpackets: %d\n",
+ __func__, item->reg, item->reg_size,
+ item->num_subpackets);
+
+ reg = find_next_bit(rdesc->presense_map,
+ RMI_REG_DESC_PRESENSE_BITS, reg + 1);
+ }
+
+free_struct_buff:
+ kfree(struct_buf);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(rmi_read_register_desc);
+
+const struct rmi_register_desc_item *rmi_get_register_desc_item(
+ struct rmi_register_descriptor *rdesc, u16 reg)
+{
+ const struct rmi_register_desc_item *item;
+ int i;
+
+ for (i = 0; i < rdesc->num_registers; i++) {
+ item = &rdesc->registers[i];
+ if (item->reg == reg)
+ return item;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(rmi_get_register_desc_item);
+
+size_t rmi_register_desc_calc_size(struct rmi_register_descriptor *rdesc)
+{
+ const struct rmi_register_desc_item *item;
+ int i;
+ size_t size = 0;
+
+ for (i = 0; i < rdesc->num_registers; i++) {
+ item = &rdesc->registers[i];
+ size += item->reg_size;
+ }
+ return size;
+}
+EXPORT_SYMBOL_GPL(rmi_register_desc_calc_size);
+
+/* Compute the register offset relative to the base address */
+int rmi_register_desc_calc_reg_offset(
+ struct rmi_register_descriptor *rdesc, u16 reg)
+{
+ const struct rmi_register_desc_item *item;
+ int offset = 0;
+ int i;
+
+ for (i = 0; i < rdesc->num_registers; i++) {
+ item = &rdesc->registers[i];
+ if (item->reg == reg)
+ return offset;
+ ++offset;
+ }
+ return -1;
+}
+EXPORT_SYMBOL_GPL(rmi_register_desc_calc_reg_offset);
+
+bool rmi_register_desc_has_subpacket(const struct rmi_register_desc_item *item,
+ u8 subpacket)
+{
+ return find_next_bit(item->subpacket_map, RMI_REG_DESC_PRESENSE_BITS,
+ subpacket) == subpacket;
+}
+
/* Indicates that flash programming is enabled (bootloader mode). */
#define RMI_F01_STATUS_BOOTLOADER(status) (!!((status) & 0x40))
diff --git a/drivers/input/rmi4/rmi_driver.h b/drivers/input/rmi4/rmi_driver.h
index 833e954..7823d41 100644
--- a/drivers/input/rmi4/rmi_driver.h
+++ b/drivers/input/rmi4/rmi_driver.h
@@ -99,6 +99,44 @@ struct pdt_entry {
int rmi_read_pdt_entry(struct rmi_device *rmi_dev, struct pdt_entry *entry,
u16 pdt_address);
+#define RMI_REG_DESC_PRESENSE_BITS (32 * BITS_PER_BYTE)
+#define RMI_REG_DESC_SUBPACKET_BITS (37 * BITS_PER_BYTE)
+
+/* describes a single packet register */
+struct rmi_register_desc_item {
+ u16 reg;
+ unsigned long reg_size;
+ u8 num_subpackets;
+ unsigned long subpacket_map[BITS_TO_LONGS(
+ RMI_REG_DESC_SUBPACKET_BITS)];
+};
+
+/*
+ * describes the packet registers for a particular type
+ * (ie query, control, data)
+ */
+struct rmi_register_descriptor {
+ unsigned long struct_size;
+ unsigned long presense_map[BITS_TO_LONGS(RMI_REG_DESC_PRESENSE_BITS)];
+ u8 num_registers;
+ struct rmi_register_desc_item *registers;
+};
+
+int rmi_read_register_desc(struct rmi_device *d, u16 addr,
+ struct rmi_register_descriptor *rdesc);
+const struct rmi_register_desc_item *rmi_get_register_desc_item(
+ struct rmi_register_descriptor *rdesc, u16 reg);
+
+/*
+ * Calculate the total size of all of the registers described in the
+ * descriptor.
+ */
+size_t rmi_register_desc_calc_size(struct rmi_register_descriptor *rdesc);
+int rmi_register_desc_calc_reg_offset(
+ struct rmi_register_descriptor *rdesc, u16 reg);
+bool rmi_register_desc_has_subpacket(const struct rmi_register_desc_item *item,
+ u8 subpacket);
+
bool rmi_is_physical_driver(struct device_driver *);
int rmi_register_physical_driver(void);
void rmi_unregister_physical_driver(void);
--
2.1.4
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