regmap-irq: Introduce virtual regs to handle more config regs

Add "virtual" registers support to handle any irq configuration
registers in addition to the ones the framework currently supports
(status, mask, unmask, wake, type and ack). These are non-standard
registers that further configure irq type on some devices, so enable the
framework to add a variable number of them.

Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>
Link: https://lore.kernel.org/r/a1787067004b0e11cb960319082764397469215a.1616613838.git.gurus@codeaurora.org
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 37 insertions, 1 deletions

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index e1d8fc9ef040..d1ade76a6c93 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -38,6 +38,7 @@ struct regmap_irq_chip_data {
 	unsigned int *wake_buf;
 	unsigned int *type_buf;
 	unsigned int *type_buf_def;
+	unsigned int **virt_buf;
 
 	unsigned int irq_reg_stride;
 	unsigned int type_reg_stride;
@@ -94,7 +95,7 @@ static void regmap_irq_sync_unlock(struct irq_data *data)
 {
 	struct regmap_irq_chip_data *d = irq_data_get_irq_chip_data(data);
 	struct regmap *map = d->map;
-	int i, ret;
+	int i, j, ret;
 	u32 reg;
 	u32 unmask_offset;
 	u32 val;
@@ -218,6 +219,20 @@ static void regmap_irq_sync_unlock(struct irq_data *data)
 		}
 	}
 
+	if (d->chip->num_virt_regs) {
+		for (i = 0; i < d->chip->num_virt_regs; i++) {
+			for (j = 0; j < d->chip->num_regs; j++) {
+				reg = sub_irq_reg(d, d->chip->virt_reg_base[i],
+						  j);
+				ret = regmap_write(map, reg, d->virt_buf[i][j]);
+				if (ret != 0)
+					dev_err(d->map->dev,
+						"Failed to write virt 0x%x: %d\n",
+						reg, ret);
+			}
+		}
+	}
+
 	if (d->chip->runtime_pm)
 		pm_runtime_put(map->dev);
 
@@ -691,6 +706,24 @@ int regmap_add_irq_chip_fwnode(struct fwnode_handle *fwnode,
 			goto err_alloc;
 	}
 
+	if (chip->num_virt_regs) {
+		/*
+		 * Create virt_buf[chip->num_extra_config_regs][chip->num_regs]
+		 */
+		d->virt_buf = kcalloc(chip->num_virt_regs, sizeof(*d->virt_buf),
+				      GFP_KERNEL);
+		if (!d->virt_buf)
+			goto err_alloc;
+
+		for (i = 0; i < chip->num_virt_regs; i++) {
+			d->virt_buf[i] = kcalloc(chip->num_regs,
+						 sizeof(unsigned int),
+						 GFP_KERNEL);
+			if (!d->virt_buf[i])
+				goto err_alloc;
+		}
+	}
+
 	d->irq_chip = regmap_irq_chip;
 	d->irq_chip.name = chip->name;
 	d->irq = irq;
@@ -863,6 +896,9 @@ err_alloc:
 	kfree(d->mask_buf);
 	kfree(d->status_buf);
 	kfree(d->status_reg_buf);
+	for (i = 0; i < chip->num_virt_regs; i++)
+		kfree(d->virt_buf[i]);
+	kfree(d->virt_buf);
 	kfree(d);
 	return ret;
 }