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Subject[PATCH 2/3] pwm: msm-vibrator: new driver for the vibrator found on various MSM SOCs
Date
This patch adds a new PWM vibrator driver that supports various
Qualcomm MSM SOCs. It is intended to be wired into the pwm-vibra driver
in the input/misc/ subsystem via device tree. Driver was tested on a
LG Nexus 5 (hammerhead) phone.

Signed-off-by: Brian Masney <masneyb@onstation.org>
---
drivers/pwm/Kconfig | 9 ++
drivers/pwm/Makefile | 1 +
drivers/pwm/pwm-msm-vibrator.c | 227 +++++++++++++++++++++++++++++++++
3 files changed, 237 insertions(+)
create mode 100644 drivers/pwm/pwm-msm-vibrator.c

diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index 504d252716f2..49dbcfd60f50 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -273,6 +273,15 @@ config PWM_MESON
To compile this driver as a module, choose M here: the module
will be called pwm-meson.

+config PWM_MSM_VIBRATOR
+ tristate "Qualcomm MSM vibrator PWM driver"
+ help
+ PWM support for the vibrator that is found on various Qualcomm
+ MSM SOCs.
+
+ To compile this driver as a module, choose M here: the module
+ will be called pwm-msm-vibrator.
+
config PWM_MTK_DISP
tristate "MediaTek display PWM driver"
depends on ARCH_MEDIATEK || COMPILE_TEST
diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index 9c676a0dadf5..60fd9f9b0fbb 100644
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_PWM_LPSS_PCI) += pwm-lpss-pci.o
obj-$(CONFIG_PWM_LPSS_PLATFORM) += pwm-lpss-platform.o
obj-$(CONFIG_PWM_MESON) += pwm-meson.o
obj-$(CONFIG_PWM_MEDIATEK) += pwm-mediatek.o
+obj-$(CONFIG_PWM_MSM_VIBRATOR) += pwm-msm-vibrator.o
obj-$(CONFIG_PWM_MTK_DISP) += pwm-mtk-disp.o
obj-$(CONFIG_PWM_MXS) += pwm-mxs.o
obj-$(CONFIG_PWM_OMAP_DMTIMER) += pwm-omap-dmtimer.o
diff --git a/drivers/pwm/pwm-msm-vibrator.c b/drivers/pwm/pwm-msm-vibrator.c
new file mode 100644
index 000000000000..00ec40885eb4
--- /dev/null
+++ b/drivers/pwm/pwm-msm-vibrator.c
@@ -0,0 +1,227 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * PWM driver for the vibrator found on various MSM SOCs.
+ *
+ * Copyright (c) 2018 Brian Masney <masneyb@onstation.org>
+ *
+ * Based on qcom,pwm-vibrator.c from:
+ * Copyright (c) 2018 Jonathan Marek <jonathan@marek.ca>
+ *
+ * Based on msm_pwm_vibrator.c from downstream Android sources:
+ * Copyright (C) 2009-2014 LGE, Inc.
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/regulator/consumer.h>
+
+#define REG_CMD_RCGR 0x00
+#define REG_CFG_RCGR 0x04
+#define REG_M 0x08
+#define REG_N 0x0C
+#define REG_D 0x10
+#define REG_CBCR 0x24
+#define MMSS_CC_M_DEFAULT 1
+
+struct msm_vibra_pwm {
+ struct pwm_chip chip;
+ struct device *dev;
+ void __iomem *base;
+ struct regulator *vcc;
+ struct clk *clk;
+ struct gpio_desc *enable_gpio;
+ bool enabled;
+};
+
+#define to_msm_vibra_pwm(pwm_chip) \
+ container_of(pwm_chip, struct msm_vibra_pwm, chip)
+
+#define msm_vibra_pwm_write(msm_pwm, offset, value) \
+ writel((value), (void __iomem *)((msm_pwm)->base + (offset)))
+
+static int msm_vibra_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
+ int duty_ns, int period_ns)
+{
+ struct msm_vibra_pwm *msm_pwm = to_msm_vibra_pwm(chip);
+ int d_reg_val;
+
+ d_reg_val = 127 - (((duty_ns / 1000) * 126) / (period_ns / 1000));
+
+ msm_vibra_pwm_write(msm_pwm, REG_CFG_RCGR,
+ (2 << 12) | /* dual edge mode */
+ (0 << 8) | /* cxo */
+ (7 << 0));
+ msm_vibra_pwm_write(msm_pwm, REG_M, 1);
+ msm_vibra_pwm_write(msm_pwm, REG_N, 128);
+ msm_vibra_pwm_write(msm_pwm, REG_D, d_reg_val);
+ msm_vibra_pwm_write(msm_pwm, REG_CMD_RCGR, 1);
+ msm_vibra_pwm_write(msm_pwm, REG_CBCR, 1);
+
+ return 0;
+}
+
+static int msm_vibra_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct msm_vibra_pwm *msm_pwm = to_msm_vibra_pwm(chip);
+ int ret;
+
+ ret = clk_set_rate(msm_pwm->clk, 24000);
+ if (ret) {
+ dev_err(msm_pwm->dev, "Failed to set clock rate: %d\n", ret);
+ return ret;
+ }
+
+ ret = clk_prepare_enable(msm_pwm->clk);
+ if (ret) {
+ dev_err(msm_pwm->dev, "Failed to enable clock: %d\n", ret);
+ return ret;
+ }
+
+ ret = regulator_enable(msm_pwm->vcc);
+ if (ret) {
+ dev_err(msm_pwm->dev, "Failed to enable regulator: %d\n", ret);
+ return ret;
+ }
+
+ gpiod_set_value_cansleep(msm_pwm->enable_gpio, 1);
+ msm_pwm->enabled = true;
+
+ return 0;
+}
+
+static void msm_vibra_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct msm_vibra_pwm *msm_pwm = to_msm_vibra_pwm(chip);
+
+ gpiod_set_value_cansleep(msm_pwm->enable_gpio, 0);
+ regulator_disable(msm_pwm->vcc);
+ clk_disable_unprepare(msm_pwm->clk);
+ msm_pwm->enabled = false;
+}
+
+static const struct pwm_ops msm_vibra_pwm_ops = {
+ .config = msm_vibra_pwm_config,
+ .enable = msm_vibra_pwm_enable,
+ .disable = msm_vibra_pwm_disable,
+ .owner = THIS_MODULE,
+};
+
+static int msm_vibra_pwm_probe(struct platform_device *pdev)
+{
+ struct msm_vibra_pwm *msm_pwm;
+ struct resource *res;
+
+ msm_pwm = devm_kzalloc(&pdev->dev, sizeof(*msm_pwm), GFP_KERNEL);
+ if (!msm_pwm)
+ return -ENOMEM;
+
+ msm_pwm->dev = &pdev->dev;
+
+ msm_pwm->vcc = devm_regulator_get(&pdev->dev, "vcc");
+ if (IS_ERR(msm_pwm->vcc)) {
+ if (PTR_ERR(msm_pwm->vcc) != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "Failed to get regulator: %ld\n",
+ PTR_ERR(msm_pwm->vcc));
+ return PTR_ERR(msm_pwm->vcc);
+ }
+
+ msm_pwm->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(msm_pwm->enable_gpio)) {
+ dev_err(&pdev->dev, "Failed to get enable gpio: %ld\n",
+ PTR_ERR(msm_pwm->enable_gpio));
+ return PTR_ERR(msm_pwm->enable_gpio);
+ }
+
+ msm_pwm->clk = devm_clk_get(&pdev->dev, "pwm");
+ if (IS_ERR(msm_pwm->clk)) {
+ dev_err(&pdev->dev, "Failed to lookup pwm clock: %ld\n",
+ PTR_ERR(msm_pwm->clk));
+ return PTR_ERR(msm_pwm->clk);
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "Failed to get platform resource\n");
+ return -ENODEV;
+ }
+
+ msm_pwm->base = devm_ioremap(&pdev->dev, res->start,
+ resource_size(res));
+ if (IS_ERR(msm_pwm->base)) {
+ dev_err(&pdev->dev, "Failed to iomap resource: %ld\n",
+ PTR_ERR(msm_pwm->base));
+ return PTR_ERR(msm_pwm->base);
+ }
+
+ msm_pwm->chip.dev = &pdev->dev;
+ msm_pwm->chip.ops = &msm_vibra_pwm_ops;
+ msm_pwm->enabled = false;
+ msm_pwm->chip.npwm = 1;
+ msm_pwm->chip.of_xlate = of_pwm_xlate_with_flags;
+ msm_pwm->chip.of_pwm_n_cells = 3;
+
+ platform_set_drvdata(pdev, msm_pwm);
+
+ return pwmchip_add(&msm_pwm->chip);
+}
+
+static __maybe_unused int msm_vibra_pwm_suspend(struct device *dev)
+{
+ struct msm_vibra_pwm *msm_pwm = dev_get_drvdata(dev);
+ struct pwm_device *pwm = msm_pwm->chip.pwms;
+
+ if (msm_pwm->enabled)
+ msm_vibra_pwm_disable(&msm_pwm->chip, pwm);
+
+ return 0;
+}
+
+static __maybe_unused int msm_vibra_pwm_resume(struct device *dev)
+{
+ return 0;
+}
+
+static int msm_vibra_pwm_remove(struct platform_device *pdev)
+{
+ struct msm_vibra_pwm *msm_pwm = platform_get_drvdata(pdev);
+ struct pwm_device *pwm = msm_pwm->chip.pwms;
+
+ if (msm_pwm->enabled)
+ msm_vibra_pwm_disable(&msm_pwm->chip, pwm);
+
+ return pwmchip_remove(&msm_pwm->chip);
+}
+
+static const struct of_device_id msm_vibra_pwm_of_match[] = {
+ { .compatible = "qcom,msm8226-pwm-vibrator" },
+ { .compatible = "qcom,msm8974-pwm-vibrator" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, msm_vibra_pwm_of_match);
+
+static const struct dev_pm_ops msm_vibra_pwm_pm_ops = {
+ .suspend = msm_vibra_pwm_suspend,
+ .resume = msm_vibra_pwm_resume,
+};
+
+static struct platform_driver msm_vibra_pwm_driver = {
+ .driver = {
+ .name = "pwm-msm-vibrator",
+ .of_match_table = msm_vibra_pwm_of_match,
+ .pm = &msm_vibra_pwm_pm_ops,
+ },
+ .probe = msm_vibra_pwm_probe,
+ .remove = msm_vibra_pwm_remove,
+};
+module_platform_driver(msm_vibra_pwm_driver);
+
+MODULE_AUTHOR("Brian Masney <masneyb@onstation.org>");
+MODULE_DESCRIPTION("PWM driver for the vibrator found on various MSM SOCs.");
+MODULE_LICENSE("GPL");
--
2.17.1
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