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path: root/drivers/mfd/ti_am335x_tscadc.c
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Diffstat (limited to 'drivers/mfd/ti_am335x_tscadc.c')
-rw-r--r--drivers/mfd/ti_am335x_tscadc.c112
1 files changed, 89 insertions, 23 deletions
diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index e9f3fb510b4..b003a16ba22 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -22,10 +22,10 @@
#include <linux/regmap.h>
#include <linux/mfd/core.h>
#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/mfd/ti_am335x_tscadc.h>
-#include <linux/input/ti_am335x_tsc.h>
-#include <linux/platform_data/ti_am335x_adc.h>
static unsigned int tscadc_readl(struct ti_tscadc_dev *tsadc, unsigned int reg)
{
@@ -48,6 +48,32 @@ static const struct regmap_config tscadc_regmap_config = {
.val_bits = 32,
};
+void am335x_tsc_se_update(struct ti_tscadc_dev *tsadc)
+{
+ tscadc_writel(tsadc, REG_SE, tsadc->reg_se_cache);
+}
+EXPORT_SYMBOL_GPL(am335x_tsc_se_update);
+
+void am335x_tsc_se_set(struct ti_tscadc_dev *tsadc, u32 val)
+{
+ spin_lock(&tsadc->reg_lock);
+ tsadc->reg_se_cache |= val;
+ spin_unlock(&tsadc->reg_lock);
+
+ am335x_tsc_se_update(tsadc);
+}
+EXPORT_SYMBOL_GPL(am335x_tsc_se_set);
+
+void am335x_tsc_se_clr(struct ti_tscadc_dev *tsadc, u32 val)
+{
+ spin_lock(&tsadc->reg_lock);
+ tsadc->reg_se_cache &= ~val;
+ spin_unlock(&tsadc->reg_lock);
+
+ am335x_tsc_se_update(tsadc);
+}
+EXPORT_SYMBOL_GPL(am335x_tsc_se_clr);
+
static void tscadc_idle_config(struct ti_tscadc_dev *config)
{
unsigned int idleconfig;
@@ -63,27 +89,48 @@ static int ti_tscadc_probe(struct platform_device *pdev)
struct ti_tscadc_dev *tscadc;
struct resource *res;
struct clk *clk;
- struct mfd_tscadc_board *pdata = pdev->dev.platform_data;
+ struct device_node *node = pdev->dev.of_node;
struct mfd_cell *cell;
+ struct property *prop;
+ const __be32 *cur;
+ u32 val;
int err, ctrl;
int clk_value, clock_rate;
- int tsc_wires, adc_channels = 0, total_channels;
+ int tsc_wires = 0, adc_channels = 0, total_channels;
+ int readouts = 0;
- if (!pdata) {
- dev_err(&pdev->dev, "Could not find platform data\n");
+ if (!pdev->dev.of_node) {
+ dev_err(&pdev->dev, "Could not find valid DT data.\n");
return -EINVAL;
}
- if (pdata->adc_init)
- adc_channels = pdata->adc_init->adc_channels;
-
- tsc_wires = pdata->tsc_init->wires;
+ node = of_get_child_by_name(pdev->dev.of_node, "tsc");
+ of_property_read_u32(node, "ti,wires", &tsc_wires);
+ of_property_read_u32(node, "ti,coordiante-readouts", &readouts);
+
+ node = of_get_child_by_name(pdev->dev.of_node, "adc");
+ of_property_for_each_u32(node, "ti,adc-channels", prop, cur, val) {
+ adc_channels++;
+ if (val > 7) {
+ dev_err(&pdev->dev, " PIN numbers are 0..7 (not %d)\n",
+ val);
+ return -EINVAL;
+ }
+ }
total_channels = tsc_wires + adc_channels;
-
if (total_channels > 8) {
dev_err(&pdev->dev, "Number of i/p channels more than 8\n");
return -EINVAL;
}
+ if (total_channels == 0) {
+ dev_err(&pdev->dev, "Need atleast one channel.\n");
+ return -EINVAL;
+ }
+
+ if (readouts * 2 + 2 + adc_channels > 16) {
+ dev_err(&pdev->dev, "Too many step configurations requested\n");
+ return -EINVAL;
+ }
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
@@ -129,6 +176,7 @@ static int ti_tscadc_probe(struct platform_device *pdev)
goto ret;
}
+ spin_lock_init(&tscadc->reg_lock);
pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
@@ -173,26 +221,37 @@ static int ti_tscadc_probe(struct platform_device *pdev)
ctrl |= CNTRLREG_TSCSSENB;
tscadc_writel(tscadc, REG_CTRL, ctrl);
+ tscadc->used_cells = 0;
+ tscadc->tsc_cell = -1;
+ tscadc->adc_cell = -1;
+
/* TSC Cell */
- cell = &tscadc->cells[TSC_CELL];
- cell->name = "tsc";
- cell->platform_data = tscadc;
- cell->pdata_size = sizeof(*tscadc);
+ if (tsc_wires > 0) {
+ tscadc->tsc_cell = tscadc->used_cells;
+ cell = &tscadc->cells[tscadc->used_cells++];
+ cell->name = "TI-am335x-tsc";
+ cell->of_compatible = "ti,am3359-tsc";
+ cell->platform_data = &tscadc;
+ cell->pdata_size = sizeof(tscadc);
+ }
/* ADC Cell */
- cell = &tscadc->cells[ADC_CELL];
- cell->name = "tiadc";
- cell->platform_data = tscadc;
- cell->pdata_size = sizeof(*tscadc);
+ if (adc_channels > 0) {
+ tscadc->adc_cell = tscadc->used_cells;
+ cell = &tscadc->cells[tscadc->used_cells++];
+ cell->name = "TI-am335x-adc";
+ cell->of_compatible = "ti,am3359-adc";
+ cell->platform_data = &tscadc;
+ cell->pdata_size = sizeof(tscadc);
+ }
err = mfd_add_devices(&pdev->dev, pdev->id, tscadc->cells,
- TSCADC_CELLS, NULL, 0, NULL);
+ tscadc->used_cells, NULL, 0, NULL);
if (err < 0)
goto err_disable_clk;
device_init_wakeup(&pdev->dev, true);
platform_set_drvdata(pdev, tscadc);
-
return 0;
err_disable_clk:
@@ -239,7 +298,7 @@ static int tscadc_resume(struct device *dev)
CNTRLREG_STEPID | CNTRLREG_4WIRE;
tscadc_writel(tscadc_dev, REG_CTRL, ctrl);
tscadc_idle_config(tscadc_dev);
- tscadc_writel(tscadc_dev, REG_SE, STPENB_STEPENB);
+ am335x_tsc_se_update(tscadc_dev);
restore = tscadc_readl(tscadc_dev, REG_CTRL);
tscadc_writel(tscadc_dev, REG_CTRL,
(restore | CNTRLREG_TSCSSENB));
@@ -256,11 +315,18 @@ static const struct dev_pm_ops tscadc_pm_ops = {
#define TSCADC_PM_OPS NULL
#endif
+static const struct of_device_id ti_tscadc_dt_ids[] = {
+ { .compatible = "ti,am3359-tscadc", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ti_tscadc_dt_ids);
+
static struct platform_driver ti_tscadc_driver = {
.driver = {
- .name = "ti_tscadc",
+ .name = "ti_am3359-tscadc",
.owner = THIS_MODULE,
.pm = TSCADC_PM_OPS,
+ .of_match_table = of_match_ptr(ti_tscadc_dt_ids),
},
.probe = ti_tscadc_probe,
.remove = ti_tscadc_remove,