diff options
Diffstat (limited to 'drivers/iio/adc/exynos_adc.c')
| -rw-r--r-- | drivers/iio/adc/exynos_adc.c | 111 |
1 files changed, 103 insertions, 8 deletions
diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c index 66d27c638d83..fc9dfc23ecb7 100644 --- a/drivers/iio/adc/exynos_adc.c +++ b/drivers/iio/adc/exynos_adc.c @@ -24,6 +24,7 @@ #include <linux/platform_device.h> #include <linux/interrupt.h> #include <linux/delay.h> +#include <linux/errno.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/io.h> @@ -70,8 +71,9 @@ #define ADC_V2_CON2_ACH_SEL(x) (((x) & 0xF) << 0) #define ADC_V2_CON2_ACH_MASK 0xF -#define MAX_ADC_V2_CHANNELS 10 -#define MAX_ADC_V1_CHANNELS 8 +#define MAX_ADC_V2_CHANNELS 10 +#define MAX_ADC_V1_CHANNELS 8 +#define MAX_EXYNOS3250_ADC_CHANNELS 2 /* Bit definitions common for ADC_V1 and ADC_V2 */ #define ADC_CON_EN_START (1u << 0) @@ -81,9 +83,11 @@ struct exynos_adc { struct exynos_adc_data *data; + struct device *dev; void __iomem *regs; void __iomem *enable_reg; struct clk *clk; + struct clk *sclk; unsigned int irq; struct regulator *vdd; @@ -95,6 +99,7 @@ struct exynos_adc { struct exynos_adc_data { int num_channels; + bool needs_sclk; void (*init_hw)(struct exynos_adc *info); void (*exit_hw)(struct exynos_adc *info); @@ -102,6 +107,66 @@ struct exynos_adc_data { void (*start_conv)(struct exynos_adc *info, unsigned long addr); }; +static void exynos_adc_unprepare_clk(struct exynos_adc *info) +{ + if (info->data->needs_sclk) + clk_unprepare(info->sclk); + clk_unprepare(info->clk); +} + +static int exynos_adc_prepare_clk(struct exynos_adc *info) +{ + int ret; + + ret = clk_prepare(info->clk); + if (ret) { + dev_err(info->dev, "failed preparing adc clock: %d\n", ret); + return ret; + } + + if (info->data->needs_sclk) { + ret = clk_prepare(info->sclk); + if (ret) { + clk_unprepare(info->clk); + dev_err(info->dev, + "failed preparing sclk_adc clock: %d\n", ret); + return ret; + } + } + + return 0; +} + +static void exynos_adc_disable_clk(struct exynos_adc *info) +{ + if (info->data->needs_sclk) + clk_disable(info->sclk); + clk_disable(info->clk); +} + +static int exynos_adc_enable_clk(struct exynos_adc *info) +{ + int ret; + + ret = clk_enable(info->clk); + if (ret) { + dev_err(info->dev, "failed enabling adc clock: %d\n", ret); + return ret; + } + + if (info->data->needs_sclk) { + ret = clk_enable(info->sclk); + if (ret) { + clk_disable(info->clk); + dev_err(info->dev, + "failed enabling sclk_adc clock: %d\n", ret); + return ret; + } + } + + return 0; +} + static void exynos_adc_v1_init_hw(struct exynos_adc *info) { u32 con1; @@ -208,6 +273,16 @@ static const struct exynos_adc_data exynos_adc_v2_data = { .start_conv = exynos_adc_v2_start_conv, }; +static const struct exynos_adc_data exynos3250_adc_data = { + .num_channels = MAX_EXYNOS3250_ADC_CHANNELS, + .needs_sclk = true, + + .init_hw = exynos_adc_v2_init_hw, + .exit_hw = exynos_adc_v2_exit_hw, + .clear_irq = exynos_adc_v2_clear_irq, + .start_conv = exynos_adc_v2_start_conv, +}; + static const struct of_device_id exynos_adc_match[] = { { .compatible = "samsung,exynos-adc-v1", @@ -215,6 +290,9 @@ static const struct of_device_id exynos_adc_match[] = { }, { .compatible = "samsung,exynos-adc-v2", .data = &exynos_adc_v2_data, + }, { + .compatible = "samsung,exynos3250-adc", + .data = &exynos3250_adc_data, }, {}, }; @@ -376,6 +454,7 @@ static int exynos_adc_probe(struct platform_device *pdev) } info->irq = irq; + info->dev = &pdev->dev; init_completion(&info->completion); @@ -386,6 +465,16 @@ static int exynos_adc_probe(struct platform_device *pdev) return PTR_ERR(info->clk); } + if (info->data->needs_sclk) { + info->sclk = devm_clk_get(&pdev->dev, "sclk"); + if (IS_ERR(info->sclk)) { + dev_err(&pdev->dev, + "failed getting sclk clock, err = %ld\n", + PTR_ERR(info->sclk)); + return PTR_ERR(info->sclk); + } + } + info->vdd = devm_regulator_get(&pdev->dev, "vdd"); if (IS_ERR(info->vdd)) { dev_err(&pdev->dev, "failed getting regulator, err = %ld\n", @@ -397,10 +486,14 @@ static int exynos_adc_probe(struct platform_device *pdev) if (ret) return ret; - ret = clk_prepare_enable(info->clk); + ret = exynos_adc_prepare_clk(info); if (ret) goto err_disable_reg; + ret = exynos_adc_enable_clk(info); + if (ret) + goto err_unprepare_clk; + platform_set_drvdata(pdev, indio_dev); indio_dev->name = dev_name(&pdev->dev); @@ -443,7 +536,9 @@ err_irq: err_disable_clk: if (info->data->exit_hw) info->data->exit_hw(info); - clk_disable_unprepare(info->clk); + exynos_adc_disable_clk(info); +err_unprepare_clk: + exynos_adc_unprepare_clk(info); err_disable_reg: regulator_disable(info->vdd); return ret; @@ -460,7 +555,8 @@ static int exynos_adc_remove(struct platform_device *pdev) free_irq(info->irq, info); if (info->data->exit_hw) info->data->exit_hw(info); - clk_disable_unprepare(info->clk); + exynos_adc_disable_clk(info); + exynos_adc_unprepare_clk(info); regulator_disable(info->vdd); return 0; @@ -474,8 +570,7 @@ static int exynos_adc_suspend(struct device *dev) if (info->data->exit_hw) info->data->exit_hw(info); - - clk_disable_unprepare(info->clk); + exynos_adc_disable_clk(info); regulator_disable(info->vdd); return 0; @@ -491,7 +586,7 @@ static int exynos_adc_resume(struct device *dev) if (ret) return ret; - ret = clk_prepare_enable(info->clk); + ret = exynos_adc_enable_clk(info); if (ret) return ret; |