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mfd: ti_tscadc: deal with partial activation

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Fix the mfd device in the case where a subdevice might not be activated.

Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
This commit is contained in:
Pantelis Antoniou 2012-10-13 16:37:24 +03:00 committed by Sebastian Andrzej Siewior
parent c80df483f6
commit 24d5c82f82
2 changed files with 28 additions and 18 deletions
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22
drivers/mfd/ti_am335x_tscadc.c
View File

@ -107,11 +107,14 @@ static int ti_tscadc_probe(struct platform_device *pdev)
of_property_read_u32(node, "ti,adc-channels", &adc_channels);
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;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
@ -202,28 +205,37 @@ 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];
if (tsc_wires > 0) {
tscadc->tsc_cell = tscadc->used_cells;
cell = &tscadc->cells[tscadc->used_cells++];
cell->name = "tsc";
cell->of_compatible = "ti,am3359-tsc";
cell->platform_data = &tscadc;
cell->pdata_size = sizeof(tscadc);
}
/* ADC Cell */
cell = &tscadc->cells[ADC_CELL];
if (adc_channels > 0) {
tscadc->adc_cell = tscadc->used_cells;
cell = &tscadc->cells[tscadc->used_cells++];
cell->name = "tiadc";
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:

8
include/linux/mfd/ti_am335x_tscadc.h
View File

@ -120,11 +120,6 @@
#define TSCADC_CELLS 2
enum tscadc_cells {
TSC_CELL,
ADC_CELL,
};
struct mfd_tscadc_board {
struct tsc_data *tsc_init;
struct adc_data *adc_init;
@ -135,6 +130,9 @@ struct ti_tscadc_dev {
struct regmap *regmap_tscadc;
void __iomem *tscadc_base;
int irq;
int used_cells; /* 1-2 */
int tsc_cell; /* -1 if not used */
int adc_cell; /* -1 if not used */
struct mfd_cell cells[TSCADC_CELLS];
u32 reg_se_cache;
spinlock_t reg_lock;