mfd: Add ASIC3 LED support

Add LED support for the HTC ASIC3. Underlying support is provided by the mfd/asic3 and leds/leds-asic3 drivers. An example configuration is provided by the pxa/hx4700 platform.

Signed-off-by: Paul Parsons <lost.distance@yahoo.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 68 insertions, 6 deletions

diff --git a/drivers/mfd/asic3.c b/drivers/mfd/asic3.c
index 77a3971e00bd..52e56ea43a85 100644
--- a/drivers/mfd/asic3.c
+++ b/drivers/mfd/asic3.c
@@ -88,19 +88,19 @@ struct asic3 {
 
 static int asic3_gpio_get(struct gpio_chip *chip, unsigned offset);
 
-static inline void asic3_write_register(struct asic3 *asic,
-                                 unsigned int reg, u32 value)
+void asic3_write_register(struct asic3 *asic, unsigned int reg, u32 value)
 {
         iowrite16(value, asic->mapping +
                   (reg >> asic->bus_shift));
 }
+EXPORT_SYMBOL_GPL(asic3_write_register);
 
-static inline u32 asic3_read_register(struct asic3 *asic,
-                               unsigned int reg)
+u32 asic3_read_register(struct asic3 *asic, unsigned int reg)
 {
         return ioread16(asic->mapping +
                         (reg >> asic->bus_shift));
 }
+EXPORT_SYMBOL_GPL(asic3_read_register);
 
 static void asic3_set_register(struct asic3 *asic, u32 reg, u32 bits, bool set)
 {
@@ -784,7 +784,55 @@ static struct mfd_cell asic3_cell_mmc = {
         .resources     = asic3_mmc_resources,
 };
 
+static const int clock_ledn[ASIC3_NUM_LEDS] = {
+        [0] = ASIC3_CLOCK_LED0,
+        [1] = ASIC3_CLOCK_LED1,
+        [2] = ASIC3_CLOCK_LED2,
+};
+
+static int asic3_leds_enable(struct platform_device *pdev)
+{
+        const struct mfd_cell *cell = mfd_get_cell(pdev);
+        struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
+
+        asic3_clk_enable(asic, &asic->clocks[clock_ledn[cell->id]]);
+
+        return 0;
+}
+
+static int asic3_leds_disable(struct platform_device *pdev)
+{
+        const struct mfd_cell *cell = mfd_get_cell(pdev);
+        struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
+
+        asic3_clk_disable(asic, &asic->clocks[clock_ledn[cell->id]]);
+
+        return 0;
+}
+
+static struct mfd_cell asic3_cell_leds[ASIC3_NUM_LEDS] = {
+        [0] = {
+                .name          = "leds-asic3",
+                .id            = 0,
+                .enable        = asic3_leds_enable,
+                .disable       = asic3_leds_disable,
+        },
+        [1] = {
+                .name          = "leds-asic3",
+                .id            = 1,
+                .enable        = asic3_leds_enable,
+                .disable       = asic3_leds_disable,
+        },
+        [2] = {
+                .name          = "leds-asic3",
+                .id            = 2,
+                .enable        = asic3_leds_enable,
+                .disable       = asic3_leds_disable,
+        },
+};
+
 static int __init asic3_mfd_probe(struct platform_device *pdev,
+                                  struct asic3_platform_data *pdata,
                                   struct resource *mem)
 {
         struct asic3 *asic = platform_get_drvdata(pdev);
@@ -822,9 +870,23 @@ static int __init asic3_mfd_probe(struct platform_device *pdev,
         if (ret < 0)
                 goto out;
 
-        if (mem_sdio && (irq >= 0))
+        if (mem_sdio && (irq >= 0)) {
                 ret = mfd_add_devices(&pdev->dev, pdev->id,
                         &asic3_cell_mmc, 1, mem_sdio, irq);
+                if (ret < 0)
+                        goto out;
+        }
+
+        if (pdata->leds) {
+                int i;
+
+                for (i = 0; i < ASIC3_NUM_LEDS; ++i) {
+                        asic3_cell_leds[i].platform_data = &pdata->leds[i];
+                        asic3_cell_leds[i].pdata_size = sizeof(pdata->leds[i]);
+                }
+                ret = mfd_add_devices(&pdev->dev, 0,
+                        asic3_cell_leds, ASIC3_NUM_LEDS, NULL, 0);
+        }
 
  out:
         return ret;
@@ -905,7 +967,7 @@ static int __init asic3_probe(struct platform_device *pdev)
          */
         memcpy(asic->clocks, asic3_clk_init, sizeof(asic3_clk_init));
 
-        asic3_mfd_probe(pdev, mem);
+        asic3_mfd_probe(pdev, pdata, mem);
 
         dev_info(asic->dev, "ASIC3 Core driver\n");