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Fri, 24 Apr 2026 00:13:34 -0700 (PDT) From: Svyatoslav Ryhel To: Dmitry Torokhov , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Linus Walleij , Svyatoslav Ryhel Cc: linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v1 2/2] Input: isa1200 - new driver for Imagis ISA1200 Date: Fri, 24 Apr 2026 10:13:05 +0300 Message-ID: <20260424071305.89503-3-clamor95@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260424071305.89503-1-clamor95@gmail.com> References: <20260424071305.89503-1-clamor95@gmail.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Linus Walleij The ISA1200 is a haptic feedback unit from Imagis Technology using two motors for haptic feedback in mobile phones. Used in many mobile devices c. 2012 including Samsung Galxy S Advance GT-I9070 (Janice), Samsung Beam GT-I8350 (Gavini), LG Optimus 4X P880 and LG Optimus Vu P895. The exact datasheet for the ISA1200 is not available; all data was modeled based on available downstream kernel sources for various devices and fragments of information scattered across the internet. Signed-off-by: Linus Walleij Co-developed-by: Svyatoslav Ryhel Signed-off-by: Svyatoslav Ryhel --- drivers/input/misc/Kconfig | 11 + drivers/input/misc/Makefile | 1 + drivers/input/misc/isa1200.c | 459 +++++++++++++++++++++++++++++++++++ 3 files changed, 471 insertions(+) create mode 100644 drivers/input/misc/isa1200.c diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig index 94a753fcb64f..5e5d46f44b91 100644 --- a/drivers/input/misc/Kconfig +++ b/drivers/input/misc/Kconfig @@ -852,6 +852,17 @@ config INPUT_IQS7222 To compile this driver as a module, choose M here: the module will be called iqs7222. +config INPUT_ISA1200_HAPTIC + tristate "Imagis ISA1200 haptic feedback unit" + depends on I2C + select REGMAP_I2C + help + Say Y to enable support for the Imagis ISA1200 haptic + feedback unit. + + To compile this driver as a module, choose M here: the + module will be called isa1200. + config INPUT_CMA3000 tristate "VTI CMA3000 Tri-axis accelerometer" help diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile index 415fc4e2918b..d62bf2e9d85f 100644 --- a/drivers/input/misc/Makefile +++ b/drivers/input/misc/Makefile @@ -49,6 +49,7 @@ obj-$(CONFIG_INPUT_IMS_PCU) += ims-pcu.o obj-$(CONFIG_INPUT_IQS269A) += iqs269a.o obj-$(CONFIG_INPUT_IQS626A) += iqs626a.o obj-$(CONFIG_INPUT_IQS7222) += iqs7222.o +obj-$(CONFIG_INPUT_ISA1200_HAPTIC) += isa1200.o obj-$(CONFIG_INPUT_KEYSPAN_REMOTE) += keyspan_remote.o obj-$(CONFIG_INPUT_KXTJ9) += kxtj9.o obj-$(CONFIG_INPUT_M68K_BEEP) += m68kspkr.o diff --git a/drivers/input/misc/isa1200.c b/drivers/input/misc/isa1200.c new file mode 100644 index 000000000000..965883e29c37 --- /dev/null +++ b/drivers/input/misc/isa1200.c @@ -0,0 +1,459 @@ +// SPDX-License-Identifier: GPL-2.0+ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +/* + * System control (LDO regulator) + * + * LDO voltage to register mapping is linear, but it is split in two parts: + * 2.3V - 3.0V map to 0x08 - 0x0f; 3.1V - 3.8V map to 0x00 - 0x7 + */ + +#define ISA1200_SCTRL 0x00 +#define ISA1200_LDO_VOLTAGE_BASE 0x08 +#define ISA1200_LDO_VOLTAGE_STEP 100000 +#define ISA1200_LDO_VOLTAGE_2V3 23 +#define ISA1200_LDO_VOLTAGE_3V1 31 + +/* + * The output frequency is calculated with this formula: + * + * base clock frequency + * fout = ----------------------------------------- + * (128 - PWM_FREQ) * 2 * PLLDIV * PWM_PERIOD + * + * The base clock frequency is the clock frequency provided on the + * clock input to the chip, divided by the value in HCTRL0 + * + * PWM_FREQ is configured in register HCTRL4, it is common to set this + * to 0 to get only two variables to calculate. + * + * PLLDIV is configured in register HCTRL3 (bits 7..4, so 0..15) + * PWM_PERIOD is configured in register HCTRL6 + * Further the duty cycle can be configured in HCTRL5 + */ + +/* + * HCTRL0 configures clock or PWM input and selects the divider for + * the clock input. + */ +#define ISA1200_HCTRL0 0x30 +#define ISA1200_HCTRL0_HAP_ENABLE BIT(7) +#define ISA1200_HCTRL0_PWM_GEN_MODE BIT(4) +#define ISA1200_HCTRL0_PWM_INPUT_MODE BIT(3) +#define ISA1200_HCTRL0_TO_CLKDIV(n) (128 << (n)) + +/* + * HCTRL1 configures the motor type and clock sourse + */ +#define ISA1200_HCTRL1 0x31 +#define ISA1200_HCTRL1_EXT_CLOCK BIT(7) +#define ISA1200_HCTRL1_DAC_INVERT BIT(6) +#define ISA1200_HCTRL1_MODE(n) ((n) << 5) + +/* HCTRL2 controls software reset of the chip */ +#define ISA1200_HCTRL2 0x32 +#define ISA1200_HCTRL2_SW_RESET BIT(0) + +/* + * HCTRL3 controls the PLL divisor + * + * Bits [0,1] are always set to 1 (we don't know what they are + * used for) and bit 4 and upward control the PLL divisor. + */ +#define ISA1200_HCTRL3 0x33 +#define ISA1200_HCTRL3_DEFAULT 0x03 +#define ISA1200_HCTRL3_PLLDIV(n) (((n) & 0xf) << 4) + +/* HCTRL4 controls the PWM frequency of external channel */ +#define ISA1200_HCTRL4 0x34 + +/* HCTRL5 controls the PWM high duty cycle of internal channel */ +#define ISA1200_HCTRL5 0x35 + +/* HCTRL6 controls the PWM period of internal channel */ +#define ISA1200_HCTRL6 0x36 + +#define ISA1200_EN_PINS_MAX 2 + +struct isa1200_config { + u32 ldo_voltage; + u32 mode; + u32 clkdiv; + u32 plldiv; + u32 freq; + u32 period; + u32 duty; +}; + +struct isa1200 { + struct input_dev *input; + struct regmap *map; + + struct clk *clk; + struct pwm_device *pwm; + struct gpio_descs *enable_gpios; + + struct work_struct play_work; + struct isa1200_config config; + + int level; +}; + +static const struct regmap_config isa1200_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0x3d, +}; + +static void isa1200_start(struct isa1200 *isa) +{ + struct isa1200_config *config = &isa->config; + struct pwm_state state; + u8 hctrl0, hctrl1; + DECLARE_BITMAP(values, ISA1200_EN_PINS_MAX); + + clk_prepare_enable(isa->clk); + + bitmap_fill(values, ISA1200_EN_PINS_MAX); + gpiod_multi_set_value_cansleep(isa->enable_gpios, values); + + usleep_range(200, 300); + + regmap_write(isa->map, ISA1200_SCTRL, config->ldo_voltage); + + if (isa->clk) { + hctrl0 = ISA1200_HCTRL0_PWM_GEN_MODE; + hctrl1 = ISA1200_HCTRL1_EXT_CLOCK; + } + + if (isa->pwm) { + hctrl0 = ISA1200_HCTRL0_PWM_INPUT_MODE; + hctrl1 = 0; + } + + hctrl0 |= config->clkdiv; + hctrl1 |= ISA1200_HCTRL1_DAC_INVERT; + hctrl1 |= ISA1200_HCTRL1_MODE(config->mode); + + regmap_write(isa->map, ISA1200_HCTRL0, hctrl0); + regmap_write(isa->map, ISA1200_HCTRL1, hctrl1); + + /* Make sure to de-assert software reset */ + regmap_write(isa->map, ISA1200_HCTRL2, 0x00); + + /* PLL divisor */ + regmap_write(isa->map, ISA1200_HCTRL3, + ISA1200_HCTRL3_PLLDIV(config->plldiv) | + ISA1200_HCTRL3_DEFAULT); + + /* Frequency */ + regmap_write(isa->map, ISA1200_HCTRL4, config->freq); + /* Duty cycle */ + regmap_write(isa->map, ISA1200_HCTRL5, config->period >> 1); + /* Period */ + regmap_write(isa->map, ISA1200_HCTRL6, config->period); + + hctrl0 |= ISA1200_HCTRL0_HAP_ENABLE; + regmap_write(isa->map, ISA1200_HCTRL0, hctrl0); + + if (isa->clk) + regmap_write(isa->map, ISA1200_HCTRL5, config->duty); + + if (isa->pwm) { + pwm_get_state(isa->pwm, &state); + state.duty_cycle = config->duty; + state.enabled = true; + pwm_apply_might_sleep(isa->pwm, &state); + } +} + +static void isa1200_stop(struct isa1200 *isa) +{ + struct pwm_state state; + DECLARE_BITMAP(values, ISA1200_EN_PINS_MAX); + + if (isa->pwm) { + pwm_get_state(isa->pwm, &state); + state.duty_cycle = 0; + state.enabled = false; + pwm_apply_might_sleep(isa->pwm, &state); + } + + regmap_write(isa->map, ISA1200_HCTRL0, 0x00); + + bitmap_zero(values, ISA1200_EN_PINS_MAX); + gpiod_multi_set_value_cansleep(isa->enable_gpios, values); + + clk_disable_unprepare(isa->clk); +} + +static void isa1200_play_work(struct work_struct *work) +{ + struct isa1200 *isa = + container_of(work, struct isa1200, play_work); + + if (isa->level) + isa1200_start(isa); + else + isa1200_stop(isa); +} + +static int isa1200_vibrator_play_effect(struct input_dev *input, void *data, + struct ff_effect *effect) +{ + struct isa1200 *isa = input_get_drvdata(input); + int level; + + /* + * TODO: we currently only support rumble. + * The ISA1200 can control two motors and some devices + * also have two motors mounted. + */ + level = effect->u.rumble.strong_magnitude; + if (!level) + level = effect->u.rumble.weak_magnitude; + + dev_dbg(&input->dev, "FF effect type %d level %d\n", + effect->type, level); + + if (isa->level != level) { + isa->level = level; + schedule_work(&isa->play_work); + } + + return 0; +} + +static void isa1200_vibrator_close(struct input_dev *input) +{ + struct isa1200 *isa = input_get_drvdata(input); + + cancel_work_sync(&isa->play_work); + + if (isa->level) + isa1200_stop(isa); + + isa->level = 0; +} + +static int isa1200_of_probe(struct i2c_client *client) +{ + static const char * const isa1200_supplies[] = { "vdd", "vddp" }; + struct isa1200 *isa = i2c_get_clientdata(client); + struct isa1200_config *config = &isa->config; + struct device *dev = &client->dev; + struct fwnode_handle *ldo_node; + int ret; + + isa->clk = devm_clk_get_optional(dev, NULL); + if (IS_ERR(isa->clk)) + return dev_err_probe(dev, PTR_ERR(isa->clk), + "failed to get clock\n"); + + isa->pwm = devm_pwm_get(dev, NULL); + if (IS_ERR(isa->pwm)) + isa->pwm = NULL; + + ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(isa1200_supplies), + isa1200_supplies); + if (ret) + return dev_err_probe(dev, ret, "failed to set up supplies\n"); + + isa->enable_gpios = devm_gpiod_get_array_optional(dev, "enable", + GPIOD_OUT_LOW); + if (IS_ERR(isa->enable_gpios)) + return dev_err_probe(dev, PTR_ERR(isa->enable_gpios), + "failed to get enable gpios\n"); + + ldo_node = device_get_named_child_node(dev, "ldo"); + if (!ldo_node) + return dev_err_probe(dev, -ENODEV, + "failed to get embedded LDO node\n"); + + config->ldo_voltage = 2300000; + ret = fwnode_property_read_u32(ldo_node, "regulator-min-microvolt", + &config->ldo_voltage); + fwnode_handle_put(ldo_node); + if (ret) + return dev_err_probe(dev, ret, + "failed to get ldo voltage\n"); + + /* Device supports only 2.3V - 3.8V range */ + if (config->ldo_voltage < 2300000 || config->ldo_voltage > 38000000) + return dev_err_probe(dev, -EINVAL, + "voltage is out of 2.3V - 3.8V range\n"); + + config->ldo_voltage /= ISA1200_LDO_VOLTAGE_STEP; + if (config->ldo_voltage < ISA1200_LDO_VOLTAGE_3V1) + config->ldo_voltage = config->ldo_voltage - + ISA1200_LDO_VOLTAGE_2V3 + + ISA1200_LDO_VOLTAGE_BASE; + else + config->ldo_voltage -= ISA1200_LDO_VOLTAGE_3V1; + + config->mode = ISA1200_LRA_MODE; + device_property_read_u32(dev, "imagis,mode", &config->mode); + + config->clkdiv = ISA1200_CKLDIV_128; + device_property_read_u32(dev, "imagis,clk-div", &config->clkdiv); + + config->plldiv = 1; + device_property_read_u32(dev, "imagis,pll-div", &config->plldiv); + + config->period = 0; + config->freq = 0; + config->duty = 0; + + if (isa->clk) { + ret = device_property_read_u32(dev, "imagis,period-ns", + &config->period); + if (ret) + return dev_err_probe(dev, ret, + "failed to get period\n"); + + config->duty = config->period >> 1; + } + + if (isa->pwm) { + struct pwm_state state; + + pwm_init_state(isa->pwm, &state); + + config->freq = div64_u64(NANO, state.period * + ISA1200_HCTRL0_TO_CLKDIV(config->clkdiv)); + config->duty = state.period >> 1; + + ret = pwm_apply_might_sleep(isa->pwm, &state); + if (ret) + return dev_err_probe(dev, ret, + "failed to apply initial PWM state\n"); + } + + device_property_read_u32(dev, "imagis,duty-cycle-ns", &config->duty); + + return 0; +} + +static int isa1200_probe(struct i2c_client *client) +{ + struct isa1200 *isa; + struct device *dev = &client->dev; + DECLARE_BITMAP(values, ISA1200_EN_PINS_MAX); + u32 val; + int ret; + + isa = devm_kzalloc(dev, sizeof(*isa), GFP_KERNEL); + if (!isa) + return -ENOMEM; + + isa->input = devm_input_allocate_device(dev); + if (!isa->input) + return -ENOMEM; + + i2c_set_clientdata(client, isa); + + ret = isa1200_of_probe(client); + if (ret) + return ret; + + isa->map = devm_regmap_init_i2c(client, &isa1200_regmap_config); + if (IS_ERR(isa->map)) + return dev_err_probe(dev, PTR_ERR(isa->map), + "failed to initialize register map\n"); + + clk_prepare_enable(isa->clk); + + bitmap_fill(values, ISA1200_EN_PINS_MAX); + gpiod_multi_set_value_cansleep(isa->enable_gpios, values); + + usleep_range(200, 300); + + /* Read a register so we know that regmap and I2C transport works */ + ret = regmap_read(isa->map, ISA1200_SCTRL, &val); + if (ret) + return dev_err_probe(dev, ret, "failed to read SCTRL\n"); + + INIT_WORK(&isa->play_work, isa1200_play_work); + + isa->input->name = "isa1200-haptic"; + isa->input->id.bustype = BUS_HOST; + isa->input->dev.parent = dev; + isa->input->close = isa1200_vibrator_close; + + input_set_drvdata(isa->input, isa); + + /* TODO: this hardware can likely support more than rumble */ + input_set_capability(isa->input, EV_FF, FF_RUMBLE); + + ret = input_ff_create_memless(isa->input, NULL, + isa1200_vibrator_play_effect); + if (ret) + return dev_err_probe(dev, ret, "couldn't create FF dev\n"); + + ret = input_register_device(isa->input); + if (ret) + return dev_err_probe(dev, ret, "couldn't register input dev\n"); + + return ret; +} + +static int isa1200_suspend(struct device *dev) +{ + struct isa1200 *isa = dev_get_drvdata(dev); + + if (isa->level) + isa1200_stop(isa); + + return 0; +} + +static int isa1200_resume(struct device *dev) +{ + struct isa1200 *isa = dev_get_drvdata(dev); + + if (isa->level) + isa1200_start(isa); + + return 0; +} + +static DEFINE_SIMPLE_DEV_PM_OPS(isa1200_pm_ops, isa1200_suspend, isa1200_resume); + +static const struct of_device_id isa1200_of_match[] = { + { .compatible = "imagis,isa1200" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, isa1200_of_match); + +static struct i2c_driver isa1200_i2c_driver = { + .driver = { + .name = "isa1200", + .of_match_table = isa1200_of_match, + .pm = pm_sleep_ptr(&isa1200_pm_ops), + }, + .probe = isa1200_probe, +}; +module_i2c_driver(isa1200_i2c_driver); + +MODULE_AUTHOR("Linus Walleij "); +MODULE_AUTHOR("Svyatoslav Ryhel "); +MODULE_DESCRIPTION("Imagis ISA1200 haptic feedback unit"); +MODULE_LICENSE("GPL"); -- 2.51.0