drv2667.rar_drv2667_family_haptics

/* * DRV2667 haptics driver family * * Author: Dan Murphy <[email protected]> * * Copyright: (C) 2014 Texas Instruments, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. */ #include <linux/i2c.h> #include <linux/input.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/slab.h> #include <linux/delay.h> #include <linux/regulator/consumer.h> /* Contol registers */ #define DRV2667_STATUS 0x00 #define DRV2667_CTRL_1 0x01 #define DRV2667_CTRL_2 0x02 /* Waveform sequencer */ #define DRV2667_WV_SEQ_0 0x03 #define DRV2667_WV_SEQ_1 0x04 #define DRV2667_WV_SEQ_2 0x05 #define DRV2667_WV_SEQ_3 0x06 #define DRV2667_WV_SEQ_4 0x07 #define DRV2667_WV_SEQ_5 0x08 #define DRV2667_WV_SEQ_6 0x09 #define DRV2667_WV_SEQ_7 0x0A #define DRV2667_FIFO 0x0B #define DRV2667_PAGE 0xFF #define DRV2667_MAX_REG DRV2667_PAGE #define DRV2667_PAGE_0 0x00 #define DRV2667_PAGE_1 0x01 #define DRV2667_PAGE_2 0x02 #define DRV2667_PAGE_3 0x03 #define DRV2667_PAGE_4 0x04 #define DRV2667_PAGE_5 0x05 #define DRV2667_PAGE_6 0x06 #define DRV2667_PAGE_7 0x07 #define DRV2667_PAGE_8 0x08 /* RAM fields */ #define DRV2667_RAM_HDR_SZ 0x0 /* RAM Header addresses */ #define DRV2667_RAM_START_HI 0x01 #define DRV2667_RAM_START_LO 0x02 #define DRV2667_RAM_STOP_HI 0x03 #define DRV2667_RAM_STOP_LO 0x04 #define DRV2667_RAM_REPEAT_CT 0x05 /* RAM data addresses */ #define DRV2667_RAM_AMP 0x06 #define DRV2667_RAM_FREQ 0x07 #define DRV2667_RAM_DURATION 0x08 #define DRV2667_RAM_ENVELOPE 0x09 /* Control 1 Register */ #define DRV2667_25_VPP_GAIN 0x00 #define DRV2667_50_VPP_GAIN 0x01 #define DRV2667_75_VPP_GAIN 0x02 #define DRV2667_100_VPP_GAIN 0x03 #define DRV2667_DIGITAL_IN 0xfc #define DRV2667_ANALOG_IN (1 << 2) /* Control 2 Register */ #define DRV2667_GO (1 << 0) #define DRV2667_STANDBY (1 << 6) #define DRV2667_DEV_RST (1 << 7) /* RAM Envelope settings */ #define DRV2667_NO_ENV 0x00 #define DRV2667_32_MS_ENV 0x01 #define DRV2667_64_MS_ENV 0x02 #define DRV2667_96_MS_ENV 0x03 #define DRV2667_128_MS_ENV 0x04 #define DRV2667_160_MS_ENV 0x05 #define DRV2667_192_MS_ENV 0x06 #define DRV2667_224_MS_ENV 0x07 #define DRV2667_256_MS_ENV 0x08 #define DRV2667_512_MS_ENV 0x09 #define DRV2667_768_MS_ENV 0x0a #define DRV2667_1024_MS_ENV 0x0b #define DRV2667_1280_MS_ENV 0x0c #define DRV2667_1536_MS_ENV 0x0d #define DRV2667_1792_MS_ENV 0x0e #define DRV2667_2048_MS_ENV 0x0f /** * struct drv2667_data - * @input_dev - Pointer to the input device * @client - Pointer to the I2C client * @regmap - Register map of the device * @work - Work item used to off load the enable/disable of the vibration * @regulator - Pointer to the regulator for the IC * @magnitude - Magnitude of the vibration event **/ struct drv2667_data { struct input_dev *input_dev; struct i2c_client *client; struct regmap *regmap; struct work_struct work; struct regulator *regulator; u32 page; u32 magnitude; u32 frequency; }; static struct reg_default drv2667_reg_defs[] = { { DRV2667_STATUS, 0x02 }, { DRV2667_CTRL_1, 0x28 }, { DRV2667_CTRL_2, 0x40 }, { DRV2667_WV_SEQ_0, 0x00 }, { DRV2667_WV_SEQ_1, 0x00 }, { DRV2667_WV_SEQ_2, 0x00 }, { DRV2667_WV_SEQ_3, 0x00 }, { DRV2667_WV_SEQ_4, 0x00 }, { DRV2667_WV_SEQ_5, 0x00 }, { DRV2667_WV_SEQ_6, 0x00 }, { DRV2667_WV_SEQ_7, 0x00 }, { DRV2667_FIFO, 0x00 }, { DRV2667_PAGE, 0x00 }, }; static int drv2667_set_waveform_freq(struct drv2667_data *haptics) { unsigned int read_buf; int freq; int error; /* Per the data sheet: * Sinusoid Frequency (Hz) = 7.8125 x Frequency */ freq = (haptics->frequency * 1000) / 78125; if (freq <= 0) { dev_err(&haptics->client->dev, "ERROR: Frequency calculated to %i\n", freq); return -EINVAL; } error = regmap_read(haptics->regmap, DRV2667_PAGE, &read_buf); if (error) { dev_err(&haptics->client->dev, "Failed to read the page number: %d\n", error); return -EIO; } if (read_buf == DRV2667_PAGE_0 || haptics->page != read_buf) { error = regmap_write(haptics->regmap, DRV2667_PAGE, haptics->page); if (error) { dev_err(&haptics->client->dev, "Failed to set the page: %d\n", error); return -EIO; } } error = regmap_write(haptics->regmap, DRV2667_RAM_FREQ, freq); if (error) dev_err(&haptics->client->dev, "Failed to set the frequency: %d\n", error); /* Reset back to original page */ if (read_buf == DRV2667_PAGE_0 || haptics->page != read_buf) { error = regmap_write(haptics->regmap, DRV2667_PAGE, read_buf); if (error) { dev_err(&haptics->client->dev, "Failed to set the page: %d\n", error); return -EIO; } } return error; } static void drv2667_worker(struct work_struct *work) { struct drv2667_data *haptics = container_of(work, struct drv2667_data, work); int error; if (haptics->magnitude) { error = regmap_write(haptics->regmap, DRV2667_PAGE, haptics->page); if (error) { dev_err(&haptics->client->dev, "Failed to set the page: %d\n", error); return; } error = regmap_write(haptics->regmap, DRV2667_RAM_AMP, haptics->magnitude); if (error) { dev_err(&haptics->client->dev, "Failed to set the amplitude: %d\n", error); return; } error = regmap_write(haptics->regmap, DRV2667_PAGE, DRV2667_PAGE_0); if (error) { dev_err(&haptics->client->dev, "Failed to set the page: %d\n", error); return; } error = regmap_write(haptics->regmap, DRV2667_CTRL_2, DRV2667_GO); if (error) { dev_err(&haptics->client->dev, "Failed to set the GO bit: %d\n", error); } } else { error = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2, DRV2667_GO, 0); if (error) { dev_err(&haptics->client->dev, "Failed to unset the GO bit: %d\n", error); } } } static int drv2667_haptics_play(struct input_dev *input, void *data, struct ff_effect *effect) { struct drv2667_data *haptics = input_get_drvdata(input); if (effect->u.rumble.strong_magnitude > 0) haptics->magnitude = effect->u.rumble.strong_magnitude; else if (effect->u.rumble.weak_magnitude > 0) haptics->magnitude = effect->u.rumble.weak_magnitude; else haptics->magnitude = 0; schedule_work(&haptics->work); return 0; } static void drv2667_close(struct input_dev *input) { struct drv2667_data *haptics = input_get_drvdata(input); int error; cancel_work_sync(&haptics->work); error = regmap_update_bits(haptics->regmap, DRV2667_CTRL_2, DRV2667_STANDBY, 1); if (error) dev_err(&haptics->client->dev, "Failed to enter standby mode: %d\n", error); } static const struct reg_default drv2667_init_regs[] = { { DRV2667_CTRL_2, 0 }, { DRV2667_CTRL_1, DRV2667_25_VPP_GAIN }, { DRV2667_WV_SEQ_0, 1 }, { DRV2667_WV_SEQ_1, 0 } }; static const struct reg_default drv2667_page1_init[] = { { DRV2667_RAM_HDR_SZ, 0x05 }, { DRV2667_RAM_START_HI, 0x80 }, { DRV2667_RAM_START_LO, 0x06 }, { DRV2667_RAM_STOP_HI, 0x00 }, { DRV2667_RAM_STOP_LO, 0x09 }, { DRV2667_RAM_REPEAT_CT, 0 }, { DRV2667_RAM_DURATION, 0x05 }, { DRV2667_RAM_ENVELOPE, DRV2667_NO_ENV }, { DRV2667_RAM_AMP, 0x60 }, }; static int drv2667_init(struct drv2667_data *haptics) { int error; /* Set default haptic frequency to 195Hz on Page 1*/ haptics->frequency = 195; haptics->page = DRV2667_PAGE_1; error = regmap_register_patch(haptics->regmap, drv2667_init_regs, ARRAY_SIZE(drv2667_init_regs)); if (error) { dev_err(&haptics->client->dev, "Failed to write init registers: %d\n", error); return error; } error = regmap_write(haptics->regmap, DRV2667_PAGE, haptics->page); if (error) { dev_err(&hap