/* * Samsung MHL interface driver * * Copyright (C) 2011 Samsung Electronics Co.Ltd * Author: Tomasz Stanislawski * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include MODULE_AUTHOR("Tomasz Stanislawski "); MODULE_DESCRIPTION("Samsung MHL interface driver"); MODULE_LICENSE("GPL"); struct sii9234_context { struct i2c_client *client; struct regulator *power; int gpio_n_reset; struct v4l2_subdev sd; }; static inline struct sii9234_context *sd_to_context(struct v4l2_subdev *sd) { return container_of(sd, struct sii9234_context, sd); } static inline int sii9234_readb(struct i2c_client *client, int addr) { return i2c_smbus_read_byte_data(client, addr); } static inline int sii9234_writeb(struct i2c_client *client, int addr, int value) { return i2c_smbus_write_byte_data(client, addr, value); } static inline int sii9234_writeb_mask(struct i2c_client *client, int addr, int value, int mask) { int ret; ret = i2c_smbus_read_byte_data(client, addr); if (ret < 0) return ret; ret = (ret & ~mask) | (value & mask); return i2c_smbus_write_byte_data(client, addr, ret); } static inline int sii9234_readb_idx(struct i2c_client *client, int addr) { int ret; ret = i2c_smbus_write_byte_data(client, 0xbc, addr >> 8); if (ret < 0) return ret; ret = i2c_smbus_write_byte_data(client, 0xbd, addr & 0xff); if (ret < 0) return ret; return i2c_smbus_read_byte_data(client, 0xbe); } static inline int sii9234_writeb_idx(struct i2c_client *client, int addr, int value) { int ret; ret = i2c_smbus_write_byte_data(client, 0xbc, addr >> 8); if (ret < 0) return ret; ret = i2c_smbus_write_byte_data(client, 0xbd, addr & 0xff); if (ret < 0) return ret; ret = i2c_smbus_write_byte_data(client, 0xbe, value); return ret; } static inline int sii9234_writeb_idx_mask(struct i2c_client *client, int addr, int value, int mask) { int ret; ret = sii9234_readb_idx(client, addr); if (ret < 0) return ret; ret = (ret & ~mask) | (value & mask); return sii9234_writeb_idx(client, addr, ret); } static int sii9234_reset(struct sii9234_context *ctx) { struct i2c_client *client = ctx->client; struct device *dev = &client->dev; int ret, tries; gpio_direction_output(ctx->gpio_n_reset, 1); mdelay(1); gpio_direction_output(ctx->gpio_n_reset, 0); mdelay(1); gpio_direction_output(ctx->gpio_n_reset, 1); mdelay(1); /* going to TTPI mode */ ret = sii9234_writeb(client, 0xc7, 0); if (ret < 0) { dev_err(dev, "failed to set TTPI mode\n"); return ret; } for (tries = 0; tries < 100 ; ++tries) { ret = sii9234_readb(client, 0x1b); if (ret > 0) break; if (ret < 0) { dev_err(dev, "failed to reset device\n"); return -EIO; } mdelay(1); } if (tries == 100) { dev_err(dev, "maximal number of tries reached\n"); return -EIO; } return 0; } static int sii9234_verify_version(struct i2c_client *client) { struct device *dev = &client->dev; int family, rev, tpi_rev, dev_id, sub_id, hdcp, id; family = sii9234_readb(client, 0x1b); rev = sii9234_readb(client, 0x1c) & 0x0f; tpi_rev = sii9234_readb(client, 0x1d) & 0x7f; dev_id = sii9234_readb_idx(client, 0x0103); sub_id = sii9234_readb_idx(client, 0x0102); hdcp = sii9234_readb(client, 0x30); if (family < 0 || rev < 0 || tpi_rev < 0 || dev_id < 0 || sub_id < 0 || hdcp < 0) { dev_err(dev, "failed to read chip's version\n"); return -EIO; } id = (dev_id << 8) | sub_id; dev_info(dev, "chip: SiL%02x family: %02x, rev: %02x\n", id, family, rev); dev_info(dev, "tpi_rev:%02x, hdcp: %02x\n", tpi_rev, hdcp); if (id != 0x9234) { dev_err(dev, "not supported chip\n"); return -ENODEV; } return 0; } static u8 data[][3] = { /* setup from driver created by doonsoo45.kim */ { 0x01, 0x05, 0x04 }, /* Enable Auto soft reset on SCDT = 0 */ { 0x01, 0x08, 0x35 }, /* Power Up TMDS Tx Core */ { 0x01, 0x0d, 0x1c }, /* HDMI Transcode mode enable */ { 0x01, 0x2b, 0x01 }, /* Enable HDCP Compliance workaround */ { 0x01, 0x79, 0x40 }, /* daniel test...MHL_INT */ { 0x01, 0x80, 0x34 }, /* Enable Rx PLL Clock Value */ { 0x01, 0x90, 0x27 }, /* Enable CBUS discovery */ { 0x01, 0x91, 0xe5 }, /* Skip RGND detection */ { 0x01, 0x92, 0x46 }, /* Force MHD mode */ { 0x01, 0x93, 0xdc }, /* Disable CBUS pull-up during RGND measurement */ { 0x01, 0x94, 0x66 }, /* 1.8V CBUS VTH & GND threshold */ { 0x01, 0x95, 0x31 }, /* RGND block & single discovery attempt */ { 0x01, 0x96, 0x22 }, /* use 1K and 2K setting */ { 0x01, 0xa0, 0x10 }, /* SIMG: Term mode */ { 0x01, 0xa1, 0xfc }, /* Disable internal Mobile HD driver */ { 0x01, 0xa3, 0xfa }, /* SIMG: Output Swing default EB, 3x Clk Mult */ { 0x01, 0xa5, 0x80 }, /* SIMG: RGND Hysterisis, 3x mode for Beast */ { 0x01, 0xa6, 0x0c }, /* SIMG: Swing Offset */ { 0x02, 0x3d, 0x3f }, /* Power up CVCC 1.2V core */ { 0x03, 0x00, 0x00 }, /* SIMG: correcting HW default */ { 0x03, 0x11, 0x01 }, /* Enable TxPLL Clock */ { 0x03, 0x12, 0x15 }, /* Enable Tx Clock Path & Equalizer */ { 0x03, 0x13, 0x60 }, /* SIMG: Set termination value */ { 0x03, 0x14, 0xf0 }, /* SIMG: Change CKDT level */ { 0x03, 0x17, 0x07 }, /* SIMG: PLL Calrefsel */ { 0x03, 0x1a, 0x20 }, /* VCO Cal */ { 0x03, 0x22, 0xe0 }, /* SIMG: Auto EQ */ { 0x03, 0x23, 0xc0 }, /* SIMG: Auto EQ */ { 0x03, 0x24, 0xa0 }, /* SIMG: Auto EQ */ { 0x03, 0x25, 0x80 }, /* SIMG: Auto EQ */ { 0x03, 0x26, 0x60 }, /* SIMG: Auto EQ */ { 0x03, 0x27, 0x40 }, /* SIMG: Auto EQ */ { 0x03, 0x28, 0x20 }, /* SIMG: Auto EQ */ { 0x03, 0x29, 0x00 }, /* SIMG: Auto EQ */ { 0x03, 0x31, 0x0b }, /* SIMG: Rx PLL BW value from I2C BW ~ 4MHz */ { 0x03, 0x45, 0x06 }, /* SIMG: DPLL Mode */ { 0x03, 0x4b, 0x06 }, /* SIMG: Correcting HW default */ { 0x03, 0x4c, 0xa0 }, /* Manual zone control */ { 0x03, 0x4d, 0x02 }, /* SIMG: PLL Mode Value (order is important) */ }; static int sii9234_set_internal(struct sii9234_context *ctx) { struct i2c_client *client = ctx->client; int i, ret; for (i = 0; i < ARRAY_SIZE(data); ++i) { int addr = (data[i][0] << 8) | data[i][1]; ret = sii9234_writeb_idx(client, addr, data[i][2]); if (ret < 0) return ret; } return 0; } static int sii9234_runtime_suspend(struct device *dev) { struct v4l2_subdev *sd = dev_get_drvdata(dev); struct sii9234_context *ctx = sd_to_context(sd); struct i2c_client *client = ctx->client; dev_info(dev, "suspend start\n"); sii9234_writeb_mask(client, 0x1e, 3, 3); regulator_disable(ctx->power); return 0; } static int sii9234_runtime_resume(struct device *dev) { struct v4l2_subdev *sd = dev_get_drvdata(dev); struct sii9234_context *ctx = sd_to_context(sd); struct i2c_client *client = ctx->client; int ret; dev_info(dev, "resume start\n"); regulator_enable(ctx->power); ret = sii9234_reset(ctx); if (ret) goto fail; /* enable tpi */ ret = sii9234_writeb_mask(client, 0x1e, 1, 0); if (ret < 0) goto fail; ret = sii9234_set_internal(ctx); if (ret < 0) goto fail; return 0; fail: dev_err(dev, "failed to resume\n"); regulator_disable(ctx->power); return ret; } static const struct dev_pm_ops sii9234_pm_ops = { .runtime_suspend = sii9234_runtime_suspend, .runtime_resume = sii9234_runtime_resume, }; static int sii9234_s_power(struct v4l2_subdev *sd, int on) { struct sii9234_context *ctx = sd_to_context(sd); int ret; if (on) ret = pm_runtime_get_sync(&ctx->client->dev); else ret = pm_runtime_put(&ctx->client->dev); /* only values < 0 indicate errors */ return IS_ERR_VALUE(ret) ? ret : 0; } static int sii9234_s_stream(struct v4l2_subdev *sd, int enable) { struct sii9234_context *ctx = sd_to_context(sd); /* (dis/en)able TDMS output */ sii9234_writeb_mask(ctx->client, 0x1a, enable ? 0 : ~0 , 1 << 4); return 0; } static const struct v4l2_subdev_core_ops sii9234_core_ops = { .s_power = sii9234_s_power, }; static const struct v4l2_subdev_video_ops sii9234_video_ops = { .s_stream = sii9234_s_stream, }; static const struct v4l2_subdev_ops sii9234_ops = { .core = &sii9234_core_ops, .video = &sii9234_video_ops, }; static int sii9234_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct device *dev = &client->dev; struct sii9234_platform_data *pdata = dev->platform_data; struct sii9234_context *ctx; int ret; ctx = devm_kzalloc(&client->dev, sizeof(*ctx), GFP_KERNEL); if (!ctx) { dev_err(dev, "out of memory\n"); ret = -ENOMEM; goto fail; } ctx->client = client; ctx->power = devm_regulator_get(dev, "hdmi-en"); if (IS_ERR(ctx->power)) { dev_err(dev, "failed to acquire regulator hdmi-en\n"); return PTR_ERR(ctx->power); } ctx->gpio_n_reset = pdata->gpio_n_reset; ret = devm_gpio_request(dev, ctx->gpio_n_reset, "MHL_RST"); if (ret) { dev_err(dev, "failed to acquire MHL_RST gpio\n"); return ret; } v4l2_i2c_subdev_init(&ctx->sd, client, &sii9234_ops); pm_runtime_enable(dev); /* enable device */ ret = pm_runtime_get_sync(dev); if (ret) goto fail_pm; /* verify chip version */ ret = sii9234_verify_version(client); if (ret) goto fail_pm_get; /* stop processing */ pm_runtime_put(dev); dev_info(dev, "probe successful\n"); return 0; fail_pm_get: pm_runtime_put_sync(dev); fail_pm: pm_runtime_disable(dev); fail: dev_err(dev, "probe failed\n"); return ret; } static int sii9234_remove(struct i2c_client *client) { struct device *dev = &client->dev; pm_runtime_disable(dev); dev_info(dev, "remove successful\n"); return 0; } static const struct i2c_device_id sii9234_id[] = { { "SII9234", 0 }, { }, }; MODULE_DEVICE_TABLE(i2c, sii9234_id); static struct i2c_driver sii9234_driver = { .driver = { .name = "sii9234", .owner = THIS_MODULE, .pm = &sii9234_pm_ops, }, .probe = sii9234_probe, .remove = sii9234_remove, .id_table = sii9234_id, }; module_i2c_driver(sii9234_driver);