/* * MFD driver for TWL6040 audio device * * Authors: Misael Lopez Cruz * Jorge Eduardo Candelaria * Peter Ujfalusi * * Copyright: (C) 2011 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. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA * */ #include #include #include #include #include #include #include #include #include #include #include #include #define VIBRACTRL_MEMBER(reg) ((reg == TWL6040_REG_VIBCTLL) ? 0 : 1) int twl6040_reg_read(struct twl6040 *twl6040, unsigned int reg) { int ret; unsigned int val; mutex_lock(&twl6040->io_mutex); /* Vibra control registers from cache */ if (unlikely(reg == TWL6040_REG_VIBCTLL || reg == TWL6040_REG_VIBCTLR)) { val = twl6040->vibra_ctrl_cache[VIBRACTRL_MEMBER(reg)]; } else { ret = regmap_read(twl6040->regmap, reg, &val); if (ret < 0) { mutex_unlock(&twl6040->io_mutex); return ret; } } mutex_unlock(&twl6040->io_mutex); return val; } EXPORT_SYMBOL(twl6040_reg_read); int twl6040_reg_write(struct twl6040 *twl6040, unsigned int reg, u8 val) { int ret; mutex_lock(&twl6040->io_mutex); ret = regmap_write(twl6040->regmap, reg, val); /* Cache the vibra control registers */ if (reg == TWL6040_REG_VIBCTLL || reg == TWL6040_REG_VIBCTLR) twl6040->vibra_ctrl_cache[VIBRACTRL_MEMBER(reg)] = val; mutex_unlock(&twl6040->io_mutex); return ret; } EXPORT_SYMBOL(twl6040_reg_write); int twl6040_set_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask) { int ret; mutex_lock(&twl6040->io_mutex); ret = regmap_update_bits(twl6040->regmap, reg, mask, mask); mutex_unlock(&twl6040->io_mutex); return ret; } EXPORT_SYMBOL(twl6040_set_bits); int twl6040_clear_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask) { int ret; mutex_lock(&twl6040->io_mutex); ret = regmap_update_bits(twl6040->regmap, reg, mask, 0); mutex_unlock(&twl6040->io_mutex); return ret; } EXPORT_SYMBOL(twl6040_clear_bits); /* twl6040 codec manual power-up sequence */ static int twl6040_power_up(struct twl6040 *twl6040) { u8 ldoctl, ncpctl, lppllctl; int ret; /* enable high-side LDO, reference system and internal oscillator */ ldoctl = TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA; ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl); if (ret) return ret; usleep_range(10000, 10500); /* enable negative charge pump */ ncpctl = TWL6040_NCPENA; ret = twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl); if (ret) goto ncp_err; usleep_range(1000, 1500); /* enable low-side LDO */ ldoctl |= TWL6040_LSLDOENA; ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl); if (ret) goto lsldo_err; usleep_range(1000, 1500); /* enable low-power PLL */ lppllctl = TWL6040_LPLLENA; ret = twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl); if (ret) goto lppll_err; usleep_range(5000, 5500); /* disable internal oscillator */ ldoctl &= ~TWL6040_OSCENA; ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl); if (ret) goto osc_err; return 0; osc_err: lppllctl &= ~TWL6040_LPLLENA; twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl); lppll_err: ldoctl &= ~TWL6040_LSLDOENA; twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl); lsldo_err: ncpctl &= ~TWL6040_NCPENA; twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl); ncp_err: ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA); twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl); return ret; } /* twl6040 manual power-down sequence */ static void twl6040_power_down(struct twl6040 *twl6040) { u8 ncpctl, ldoctl, lppllctl; ncpctl = twl6040_reg_read(twl6040, TWL6040_REG_NCPCTL); ldoctl = twl6040_reg_read(twl6040, TWL6040_REG_LDOCTL); lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL); /* enable internal oscillator */ ldoctl |= TWL6040_OSCENA; twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl); usleep_range(1000, 1500); /* disable low-power PLL */ lppllctl &= ~TWL6040_LPLLENA; twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl); /* disable low-side LDO */ ldoctl &= ~TWL6040_LSLDOENA; twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl); /* disable negative charge pump */ ncpctl &= ~TWL6040_NCPENA; twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl); /* disable high-side LDO, reference system and internal oscillator */ ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA); twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl); } static irqreturn_t twl6040_naudint_handler(int irq, void *data) { struct twl6040 *twl6040 = data; u8 intid, status; intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID); if (intid & TWL6040_READYINT) complete(&twl6040->ready); if (intid & TWL6040_THINT) { status = twl6040_reg_read(twl6040, TWL6040_REG_STATUS); if (status & TWL6040_TSHUTDET) { dev_warn(twl6040->dev, "Thermal shutdown, powering-off"); twl6040_power(twl6040, 0); } else { dev_warn(twl6040->dev, "Leaving thermal shutdown, powering-on"); twl6040_power(twl6040, 1); } } return IRQ_HANDLED; } static int twl6040_power_up_completion(struct twl6040 *twl6040, int naudint) { int time_left; u8 intid; time_left = wait_for_completion_timeout(&twl6040->ready, msecs_to_jiffies(144)); if (!time_left) { intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID); if (!(intid & TWL6040_READYINT)) { dev_err(twl6040->dev, "timeout waiting for READYINT\n"); return -ETIMEDOUT; } } return 0; } int twl6040_power(struct twl6040 *twl6040, int on) { int audpwron = twl6040->audpwron; int naudint = twl6040->irq; int ret = 0; mutex_lock(&twl6040->mutex); if (on) { /* already powered-up */ if (twl6040->power_count++) goto out; if (gpio_is_valid(audpwron)) { /* use AUDPWRON line */ gpio_set_value(audpwron, 1); /* wait for power-up completion */ ret = twl6040_power_up_completion(twl6040, naudint); if (ret) { dev_err(twl6040->dev, "automatic power-down failed\n"); twl6040->power_count = 0; goto out; } } else { /* use manual power-up sequence */ ret = twl6040_power_up(twl6040); if (ret) { dev_err(twl6040->dev, "manual power-up failed\n"); twl6040->power_count = 0; goto out; } } /* Default PLL configuration after power up */ twl6040->pll = TWL6040_SYSCLK_SEL_LPPLL; twl6040->sysclk = 19200000; twl6040->mclk = 32768; } else { /* already powered-down */ if (!twl6040->power_count) { dev_err(twl6040->dev, "device is already powered-off\n"); ret = -EPERM; goto out; } if (--twl6040->power_count) goto out; if (gpio_is_valid(audpwron)) { /* use AUDPWRON line */ gpio_set_value(audpwron, 0); /* power-down sequence latency */ usleep_range(500, 700); } else { /* use manual power-down sequence */ twl6040_power_down(twl6040); } twl6040->sysclk = 0; twl6040->mclk = 0; } out: mutex_unlock(&twl6040->mutex); return ret; } EXPORT_SYMBOL(twl6040_power); int twl6040_set_pll(struct twl6040 *twl6040, int pll_id, unsigned int freq_in, unsigned int freq_out) { u8 hppllctl, lppllctl; int ret = 0; mutex_lock(&twl6040->mutex); hppllctl = twl6040_reg_read(twl6040, TWL6040_REG_HPPLLCTL); lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL); /* Force full reconfiguration when switching between PLL */ if (pll_id != twl6040->pll) { twl6040->sysclk = 0; twl6040->mclk = 0; } switch (pll_id) { case TWL6040_SYSCLK_SEL_LPPLL: /* low-power PLL divider */ /* Change the sysclk configuration only if it has been canged */ if (twl6040->sysclk != freq_out) { switch (freq_out) { case 17640000: lppllctl |= TWL6040_LPLLFIN; break; case 19200000: lppllctl &= ~TWL6040_LPLLFIN; break; default: dev_err(twl6040->dev, "freq_out %d not supported\n", freq_out); ret = -EINVAL; goto pll_out; } twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl); } /* The PLL in use has not been change, we can exit */ if (twl6040->pll == pll_id) break; switch (freq_in) { case 32768: lppllctl |= TWL6040_LPLLENA; twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl); mdelay(5); lppllctl &= ~TWL6040_HPLLSEL; twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl); hppllctl &= ~TWL6040_HPLLENA; twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL, hppllctl); break; default: dev_err(twl6040->dev, "freq_in %d not supported\n", freq_in); ret = -EINVAL; goto pll_out; } break; case TWL6040_SYSCLK_SEL_HPPLL: /* high-performance PLL can provide only 19.2 MHz */ if (freq_out != 19200000) { dev_err(twl6040->dev, "freq_out %d not supported\n", freq_out); ret = -EINVAL; goto pll_out; } if (twl6040->mclk != freq_in) { hppllctl &= ~TWL6040_MCLK_MSK; switch (freq_in) { case 12000000: /* PLL enabled, active mode */ hppllctl |= TWL6040_MCLK_12000KHZ | TWL6040_HPLLENA; break; case 19200000: /* * PLL disabled * (enable PLL if MCLK jitter quality * doesn't meet specification) */ hppllctl |= TWL6040_MCLK_19200KHZ; break; case 26000000: /* PLL enabled, active mode */ hppllctl |= TWL6040_MCLK_26000KHZ | TWL6040_HPLLENA; break; case 38400000: /* PLL enabled, active mode */ hppllctl |= TWL6040_MCLK_38400KHZ | TWL6040_HPLLENA; break; default: dev_err(twl6040->dev, "freq_in %d not supported\n", freq_in); ret = -EINVAL; goto pll_out; } /* * enable clock slicer to ensure input waveform is * square */ hppllctl |= TWL6040_HPLLSQRENA; twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL, hppllctl); usleep_range(500, 700); lppllctl |= TWL6040_HPLLSEL; twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl); lppllctl &= ~TWL6040_LPLLENA; twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl); } break; default: dev_err(twl6040->dev, "unknown pll id %d\n", pll_id); ret = -EINVAL; goto pll_out; } twl6040->sysclk = freq_out; twl6040->mclk = freq_in; twl6040->pll = pll_id; pll_out: mutex_unlock(&twl6040->mutex); return ret; } EXPORT_SYMBOL(twl6040_set_pll); int twl6040_get_pll(struct twl6040 *twl6040) { if (twl6040->power_count) return twl6040->pll; else return -ENODEV; } EXPORT_SYMBOL(twl6040_get_pll); unsigned int twl6040_get_sysclk(struct twl6040 *twl6040) { return twl6040->sysclk; } EXPORT_SYMBOL(twl6040_get_sysclk); /* Get the combined status of the vibra control register */ int twl6040_get_vibralr_status(struct twl6040 *twl6040) { u8 status; status = twl6040->vibra_ctrl_cache[0] | twl6040->vibra_ctrl_cache[1]; status &= (TWL6040_VIBENA | TWL6040_VIBSEL); return status; } EXPORT_SYMBOL(twl6040_get_vibralr_status); static struct resource twl6040_vibra_rsrc[] = { { .flags = IORESOURCE_IRQ, }, }; static struct resource twl6040_codec_rsrc[] = { { .flags = IORESOURCE_IRQ, }, }; static bool twl6040_readable_reg(struct device *dev, unsigned int reg) { /* Register 0 is not readable */ if (!reg) return false; return true; } static struct regmap_config twl6040_regmap_config = { .reg_bits = 8, .val_bits = 8, .max_register = TWL6040_REG_STATUS, /* 0x2e */ .readable_reg = twl6040_readable_reg, }; static int __devinit twl6040_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct twl6040_platform_data *pdata = client->dev.platform_data; struct twl6040 *twl6040; struct mfd_cell *cell = NULL; int ret, children = 0; if (!pdata) { dev_err(&client->dev, "Platform data is missing\n"); return -EINVAL; } /* In order to operate correctly we need valid interrupt config */ if (!client->irq || !pdata->irq_base) { dev_err(&client->dev, "Invalid IRQ configuration\n"); return -EINVAL; } twl6040 = devm_kzalloc(&client->dev, sizeof(struct twl6040), GFP_KERNEL); if (!twl6040) { ret = -ENOMEM; goto err; } twl6040->regmap = regmap_init_i2c(client, &twl6040_regmap_config); if (IS_ERR(twl6040->regmap)) { ret = PTR_ERR(twl6040->regmap); goto err; } i2c_set_clientdata(client, twl6040); twl6040->dev = &client->dev; twl6040->irq = client->irq; twl6040->irq_base = pdata->irq_base; mutex_init(&twl6040->mutex); mutex_init(&twl6040->io_mutex); init_completion(&twl6040->ready); twl6040->rev = twl6040_reg_read(twl6040, TWL6040_REG_ASICREV); /* ERRATA: Automatic power-up is not possible in ES1.0 */ if (twl6040_get_revid(twl6040) > TWL6040_REV_ES1_0) twl6040->audpwron = pdata->audpwron_gpio; else twl6040->audpwron = -EINVAL; if (gpio_is_valid(twl6040->audpwron)) { ret = gpio_request_one(twl6040->audpwron, GPIOF_OUT_INIT_LOW, "audpwron"); if (ret) goto gpio1_err; } /* codec interrupt */ ret = twl6040_irq_init(twl6040); if (ret) goto gpio2_err; ret = request_threaded_irq(twl6040->irq_base + TWL6040_IRQ_READY, NULL, twl6040_naudint_handler, 0, "twl6040_irq_ready", twl6040); if (ret) { dev_err(twl6040->dev, "READY IRQ request failed: %d\n", ret); goto irq_err; } /* dual-access registers controlled by I2C only */ twl6040_set_bits(twl6040, TWL6040_REG_ACCCTL, TWL6040_I2CSEL); if (pdata->codec) { int irq = twl6040->irq_base + TWL6040_IRQ_PLUG; cell = &twl6040->cells[children]; cell->name = "twl6040-codec"; twl6040_codec_rsrc[0].start = irq; twl6040_codec_rsrc[0].end = irq; cell->resources = twl6040_codec_rsrc; cell->num_resources = ARRAY_SIZE(twl6040_codec_rsrc); cell->platform_data = pdata->codec; cell->pdata_size = sizeof(*pdata->codec); children++; } if (pdata->vibra) { int irq = twl6040->irq_base + TWL6040_IRQ_VIB; cell = &twl6040->cells[children]; cell->name = "twl6040-vibra"; twl6040_vibra_rsrc[0].start = irq; twl6040_vibra_rsrc[0].end = irq; cell->resources = twl6040_vibra_rsrc; cell->num_resources = ARRAY_SIZE(twl6040_vibra_rsrc); cell->platform_data = pdata->vibra; cell->pdata_size = sizeof(*pdata->vibra); children++; } if (children) { ret = mfd_add_devices(&client->dev, -1, twl6040->cells, children, NULL, 0); if (ret) goto mfd_err; } else { dev_err(&client->dev, "No platform data found for children\n"); ret = -ENODEV; goto mfd_err; } return 0; mfd_err: free_irq(twl6040->irq_base + TWL6040_IRQ_READY, twl6040); irq_err: twl6040_irq_exit(twl6040); gpio2_err: if (gpio_is_valid(twl6040->audpwron)) gpio_free(twl6040->audpwron); gpio1_err: i2c_set_clientdata(client, NULL); regmap_exit(twl6040->regmap); err: return ret; } static int __devexit twl6040_remove(struct i2c_client *client) { struct twl6040 *twl6040 = i2c_get_clientdata(client); if (twl6040->power_count) twl6040_power(twl6040, 0); if (gpio_is_valid(twl6040->audpwron)) gpio_free(twl6040->audpwron); free_irq(twl6040->irq_base + TWL6040_IRQ_READY, twl6040); twl6040_irq_exit(twl6040); mfd_remove_devices(&client->dev); i2c_set_clientdata(client, NULL); regmap_exit(twl6040->regmap); return 0; } static const struct i2c_device_id twl6040_i2c_id[] = { { "twl6040", 0, }, { }, }; MODULE_DEVICE_TABLE(i2c, twl6040_i2c_id); static struct i2c_driver twl6040_driver = { .driver = { .name = "twl6040", .owner = THIS_MODULE, }, .probe = twl6040_probe, .remove = __devexit_p(twl6040_remove), .id_table = twl6040_i2c_id, }; module_i2c_driver(twl6040_driver); MODULE_DESCRIPTION("TWL6040 MFD"); MODULE_AUTHOR("Misael Lopez Cruz "); MODULE_AUTHOR("Jorge Eduardo Candelaria "); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:twl6040");