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ASoC: wm8903: Expose GPIOs through gpiolib
Also, update platform_data GPIO handling to have an explicit "don't touch this pin" option. Add #defines for the GPIO pin functions. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Stephen Warren
Mark Brown
parent
9978007bef
commit
7cfe56172a
@ -36,6 +36,21 @@
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#define WM8903_MICBIAS_ENA_SHIFT 0 /* MICBIAS_ENA */
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#define WM8903_MICBIAS_ENA_WIDTH 1 /* MICBIAS_ENA */
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/*
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* WM8903_GPn_FN values
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*
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* See datasheets for list of valid values per pin
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*/
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#define WM8903_GPn_FN_GPIO_OUTPUT 0
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#define WM8903_GPn_FN_BCLK 1
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#define WM8903_GPn_FN_IRQ_OUTPT 2
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#define WM8903_GPn_FN_GPIO_INPUT 3
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#define WM8903_GPn_FN_MICBIAS_CURRENT_DETECT 4
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#define WM8903_GPn_FN_MICBIAS_SHORT_DETECT 5
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#define WM8903_GPn_FN_DMIC_LR_CLK_OUTPUT 6
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#define WM8903_GPn_FN_FLL_LOCK_OUTPUT 8
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#define WM8903_GPn_FN_FLL_CLOCK_OUTPUT 9
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/*
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* R116 (0x74) - GPIO Control 1
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*/
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@ -231,6 +246,8 @@
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#define WM8903_GP5_DB_SHIFT 0 /* GP5_DB */
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#define WM8903_GP5_DB_WIDTH 1 /* GP5_DB */
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#define WM8903_NUM_GPIO 5
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struct wm8903_platform_data {
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bool irq_active_low; /* Set if IRQ active low, default high */
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@ -243,7 +260,8 @@ struct wm8903_platform_data {
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int micdet_delay; /* Delay after microphone detection (ms) */
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u32 gpio_cfg[5]; /* Default register values for GPIO pin mux */
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int gpio_base;
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u32 gpio_cfg[WM8903_NUM_GPIO]; /* Default register values for GPIO pin mux */
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};
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#endif
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@ -2,6 +2,7 @@
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* wm8903.c -- WM8903 ALSA SoC Audio driver
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*
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* Copyright 2008 Wolfson Microelectronics
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* Copyright 2011 NVIDIA, Inc.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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@ -19,6 +20,7 @@
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#include <linux/init.h>
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#include <linux/completion.h>
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/pm.h>
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#include <linux/i2c.h>
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#include <linux/platform_device.h>
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@ -213,6 +215,7 @@ static u16 wm8903_reg_defaults[] = {
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};
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struct wm8903_priv {
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struct snd_soc_codec *codec;
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int sysclk;
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int irq;
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@ -230,6 +233,10 @@ struct wm8903_priv {
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int mic_short;
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int mic_last_report;
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int mic_delay;
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#ifdef CONFIG_GPIOLIB
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struct gpio_chip gpio_chip;
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#endif
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};
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static int wm8903_volatile_register(struct snd_soc_codec *codec, unsigned int reg)
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@ -1635,6 +1642,119 @@ static int wm8903_resume(struct snd_soc_codec *codec)
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return 0;
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}
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#ifdef CONFIG_GPIOLIB
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static inline struct wm8903_priv *gpio_to_wm8903(struct gpio_chip *chip)
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{
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return container_of(chip, struct wm8903_priv, gpio_chip);
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}
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static int wm8903_gpio_request(struct gpio_chip *chip, unsigned offset)
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{
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if (offset >= WM8903_NUM_GPIO)
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return -EINVAL;
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return 0;
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}
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static int wm8903_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
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{
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struct wm8903_priv *wm8903 = gpio_to_wm8903(chip);
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struct snd_soc_codec *codec = wm8903->codec;
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unsigned int mask, val;
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mask = WM8903_GP1_FN_MASK | WM8903_GP1_DIR_MASK;
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val = (WM8903_GPn_FN_GPIO_INPUT << WM8903_GP1_FN_SHIFT) |
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WM8903_GP1_DIR;
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return snd_soc_update_bits(codec, WM8903_GPIO_CONTROL_1 + offset,
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mask, val);
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}
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static int wm8903_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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struct wm8903_priv *wm8903 = gpio_to_wm8903(chip);
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struct snd_soc_codec *codec = wm8903->codec;
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int reg;
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reg = snd_soc_read(codec, WM8903_GPIO_CONTROL_1 + offset);
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return (reg & WM8903_GP1_LVL_MASK) >> WM8903_GP1_LVL_SHIFT;
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}
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static int wm8903_gpio_direction_out(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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struct wm8903_priv *wm8903 = gpio_to_wm8903(chip);
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struct snd_soc_codec *codec = wm8903->codec;
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unsigned int mask, val;
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mask = WM8903_GP1_FN_MASK | WM8903_GP1_DIR_MASK | WM8903_GP1_LVL_MASK;
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val = (WM8903_GPn_FN_GPIO_OUTPUT << WM8903_GP1_FN_SHIFT) |
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(value << WM8903_GP2_LVL_SHIFT);
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return snd_soc_update_bits(codec, WM8903_GPIO_CONTROL_1 + offset,
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mask, val);
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}
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static void wm8903_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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struct wm8903_priv *wm8903 = gpio_to_wm8903(chip);
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struct snd_soc_codec *codec = wm8903->codec;
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snd_soc_update_bits(codec, WM8903_GPIO_CONTROL_1 + offset,
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WM8903_GP1_LVL_MASK, value << WM8903_GP1_LVL_SHIFT);
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}
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static struct gpio_chip wm8903_template_chip = {
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.label = "wm8903",
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.owner = THIS_MODULE,
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.request = wm8903_gpio_request,
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.direction_input = wm8903_gpio_direction_in,
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.get = wm8903_gpio_get,
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.direction_output = wm8903_gpio_direction_out,
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.set = wm8903_gpio_set,
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.can_sleep = 1,
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};
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static void wm8903_init_gpio(struct snd_soc_codec *codec)
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{
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struct wm8903_priv *wm8903 = snd_soc_codec_get_drvdata(codec);
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struct wm8903_platform_data *pdata = dev_get_platdata(codec->dev);
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int ret;
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wm8903->gpio_chip = wm8903_template_chip;
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wm8903->gpio_chip.ngpio = WM8903_NUM_GPIO;
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wm8903->gpio_chip.dev = codec->dev;
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if (pdata && pdata->gpio_base)
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wm8903->gpio_chip.base = pdata->gpio_base;
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else
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wm8903->gpio_chip.base = -1;
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ret = gpiochip_add(&wm8903->gpio_chip);
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if (ret != 0)
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dev_err(codec->dev, "Failed to add GPIOs: %d\n", ret);
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}
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static void wm8903_free_gpio(struct snd_soc_codec *codec)
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{
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struct wm8903_priv *wm8903 = snd_soc_codec_get_drvdata(codec);
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int ret;
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ret = gpiochip_remove(&wm8903->gpio_chip);
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if (ret != 0)
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dev_err(codec->dev, "Failed to remove GPIOs: %d\n", ret);
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}
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#else
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static void wm8903_init_gpio(struct snd_soc_codec *codec)
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{
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}
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static void wm8903_free_gpio(struct snd_soc_codec *codec)
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{
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}
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#endif
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static int wm8903_probe(struct snd_soc_codec *codec)
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{
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struct wm8903_platform_data *pdata = dev_get_platdata(codec->dev);
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@ -1643,6 +1763,7 @@ static int wm8903_probe(struct snd_soc_codec *codec)
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int trigger, irq_pol;
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u16 val;
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wm8903->codec = codec;
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init_completion(&wm8903->wseq);
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ret = snd_soc_codec_set_cache_io(codec, 8, 16, SND_SOC_I2C);
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@ -1667,7 +1788,7 @@ static int wm8903_probe(struct snd_soc_codec *codec)
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/* Set up GPIOs and microphone detection */
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if (pdata) {
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for (i = 0; i < ARRAY_SIZE(pdata->gpio_cfg); i++) {
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if (!pdata->gpio_cfg[i])
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if (pdata->gpio_cfg[i] == WM8903_GPIO_NO_CONFIG)
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continue;
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snd_soc_write(codec, WM8903_GPIO_CONTROL_1 + i,
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@ -1749,12 +1870,15 @@ static int wm8903_probe(struct snd_soc_codec *codec)
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ARRAY_SIZE(wm8903_snd_controls));
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wm8903_add_widgets(codec);
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wm8903_init_gpio(codec);
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return ret;
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}
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/* power down chip */
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static int wm8903_remove(struct snd_soc_codec *codec)
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{
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wm8903_free_gpio(codec);
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wm8903_set_bias_level(codec, SND_SOC_BIAS_OFF);
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return 0;
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}
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