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>

diff --git a/drivers/mfd/asic3.c b/drivers/mfd/asic3.c
index 77a3971e00bdd8dcc99a2c85ec78ca21e6e74f31..52e56ea43a8538464b082a70e3ed3c78cb155d4b 100644 (file)
--- 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");