diff options
author | Marc Reilly <marc@cpdesign.com.au> | 2012-05-01 12:26:46 +0200 |
---|---|---|
committer | Samuel Ortiz <sameo@linux.intel.com> | 2012-05-01 12:35:40 +0200 |
commit | 5006fe546a4eb0393782b818d4e0e2a6b4fa3803 (patch) | |
tree | 3565d39367e75cb7581fb196748e00d95b53c5b5 /drivers/mfd/mc13xxx-core.c | |
parent | 4c394bb1683dbd110314ab37da7bfa6c9a77073d (diff) |
mfd: Prepare for separating spi and i2c mc13xxx-core backends
This patch abstracts the bus specific operations from the driver core.
Generic init and cleanup is consolidated into mc13xxx_common_*.
spi specific functions are renamed to reflect such.
(The irq member of the mc13xxx struct is no longer redundant, it's used
to store the irq for cleanup time).
Signed-off-by: Marc Reilly <marc@cpdesign.com.au>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd/mc13xxx-core.c')
-rw-r--r-- | drivers/mfd/mc13xxx-core.c | 188 |
1 files changed, 113 insertions, 75 deletions
diff --git a/drivers/mfd/mc13xxx-core.c b/drivers/mfd/mc13xxx-core.c index 9fd4f63c45c..c8b7a28b266 100644 --- a/drivers/mfd/mc13xxx-core.c +++ b/drivers/mfd/mc13xxx-core.c @@ -22,8 +22,18 @@ #include <linux/of_device.h> #include <linux/of_gpio.h> +enum mc13xxx_id { + MC13XXX_ID_MC13783, + MC13XXX_ID_MC13892, + MC13XXX_ID_INVALID, +}; + struct mc13xxx { struct spi_device *spidev; + + struct device *dev; + enum mc13xxx_id ictype; + struct mutex lock; int irq; int flags; @@ -144,36 +154,32 @@ struct mc13xxx { void mc13xxx_lock(struct mc13xxx *mc13xxx) { if (!mutex_trylock(&mc13xxx->lock)) { - dev_dbg(&mc13xxx->spidev->dev, "wait for %s from %pf\n", + dev_dbg(mc13xxx->dev, "wait for %s from %pf\n", __func__, __builtin_return_address(0)); mutex_lock(&mc13xxx->lock); } - dev_dbg(&mc13xxx->spidev->dev, "%s from %pf\n", + dev_dbg(mc13xxx->dev, "%s from %pf\n", __func__, __builtin_return_address(0)); } EXPORT_SYMBOL(mc13xxx_lock); void mc13xxx_unlock(struct mc13xxx *mc13xxx) { - dev_dbg(&mc13xxx->spidev->dev, "%s from %pf\n", + dev_dbg(mc13xxx->dev, "%s from %pf\n", __func__, __builtin_return_address(0)); mutex_unlock(&mc13xxx->lock); } EXPORT_SYMBOL(mc13xxx_unlock); #define MC13XXX_REGOFFSET_SHIFT 25 -int mc13xxx_reg_read(struct mc13xxx *mc13xxx, unsigned int offset, u32 *val) +static int mc13xxx_spi_reg_read(struct mc13xxx *mc13xxx, + unsigned int offset, u32 *val) { struct spi_transfer t; struct spi_message m; int ret; - BUG_ON(!mutex_is_locked(&mc13xxx->lock)); - - if (offset > MC13XXX_NUMREGS) - return -EINVAL; - *val = offset << MC13XXX_REGOFFSET_SHIFT; memset(&t, 0, sizeof(t)); @@ -195,26 +201,17 @@ int mc13xxx_reg_read(struct mc13xxx *mc13xxx, unsigned int offset, u32 *val) *val &= 0xffffff; - dev_vdbg(&mc13xxx->spidev->dev, "[0x%02x] -> 0x%06x\n", offset, *val); - return 0; } -EXPORT_SYMBOL(mc13xxx_reg_read); -int mc13xxx_reg_write(struct mc13xxx *mc13xxx, unsigned int offset, u32 val) +static int mc13xxx_spi_reg_write(struct mc13xxx *mc13xxx, unsigned int offset, + u32 val) { u32 buf; struct spi_transfer t; struct spi_message m; int ret; - BUG_ON(!mutex_is_locked(&mc13xxx->lock)); - - dev_vdbg(&mc13xxx->spidev->dev, "[0x%02x] <- 0x%06x\n", offset, val); - - if (offset > MC13XXX_NUMREGS || val > 0xffffff) - return -EINVAL; - buf = 1 << 31 | offset << MC13XXX_REGOFFSET_SHIFT | val; memset(&t, 0, sizeof(t)); @@ -235,6 +232,34 @@ int mc13xxx_reg_write(struct mc13xxx *mc13xxx, unsigned int offset, u32 val) return 0; } + +int mc13xxx_reg_read(struct mc13xxx *mc13xxx, unsigned int offset, u32 *val) +{ + int ret; + + BUG_ON(!mutex_is_locked(&mc13xxx->lock)); + + if (offset > MC13XXX_NUMREGS) + return -EINVAL; + + ret = mc13xxx_spi_reg_read(mc13xxx, offset, val); + dev_vdbg(mc13xxx->dev, "[0x%02x] -> 0x%06x\n", offset, *val); + + return ret; +} +EXPORT_SYMBOL(mc13xxx_reg_read); + +int mc13xxx_reg_write(struct mc13xxx *mc13xxx, unsigned int offset, u32 val) +{ + BUG_ON(!mutex_is_locked(&mc13xxx->lock)); + + dev_vdbg(mc13xxx->dev, "[0x%02x] <- 0x%06x\n", offset, val); + + if (offset > MC13XXX_NUMREGS || val > 0xffffff) + return -EINVAL; + + return mc13xxx_spi_reg_write(mc13xxx, offset, val); +} EXPORT_SYMBOL(mc13xxx_reg_write); int mc13xxx_reg_rmw(struct mc13xxx *mc13xxx, unsigned int offset, @@ -439,7 +464,7 @@ static int mc13xxx_irq_handle(struct mc13xxx *mc13xxx, if (handled == IRQ_HANDLED) num_handled++; } else { - dev_err(&mc13xxx->spidev->dev, + dev_err(mc13xxx->dev, "BUG: irq %u but no handler\n", baseirq + irq); @@ -475,25 +500,23 @@ static irqreturn_t mc13xxx_irq_thread(int irq, void *data) return IRQ_RETVAL(handled); } -enum mc13xxx_id { - MC13XXX_ID_MC13783, - MC13XXX_ID_MC13892, - MC13XXX_ID_INVALID, -}; - static const char *mc13xxx_chipname[] = { [MC13XXX_ID_MC13783] = "mc13783", [MC13XXX_ID_MC13892] = "mc13892", }; #define maskval(reg, mask) (((reg) & (mask)) >> __ffs(mask)) -static int mc13xxx_identify(struct mc13xxx *mc13xxx, enum mc13xxx_id *id) +static int mc13xxx_identify(struct mc13xxx *mc13xxx) { u32 icid; u32 revision; - const char *name; int ret; + /* + * Get the generation ID from register 46, as apparently some older + * IC revisions only have this info at this location. Newer ICs seem to + * have both. + */ ret = mc13xxx_reg_read(mc13xxx, 46, &icid); if (ret) return ret; @@ -502,26 +525,23 @@ static int mc13xxx_identify(struct mc13xxx *mc13xxx, enum mc13xxx_id *id) switch (icid) { case 2: - *id = MC13XXX_ID_MC13783; - name = "mc13783"; + mc13xxx->ictype = MC13XXX_ID_MC13783; break; case 7: - *id = MC13XXX_ID_MC13892; - name = "mc13892"; + mc13xxx->ictype = MC13XXX_ID_MC13892; break; default: - *id = MC13XXX_ID_INVALID; + mc13xxx->ictype = MC13XXX_ID_INVALID; break; } - if (*id == MC13XXX_ID_MC13783 || *id == MC13XXX_ID_MC13892) { + if (mc13xxx->ictype == MC13XXX_ID_MC13783 || + mc13xxx->ictype == MC13XXX_ID_MC13892) { ret = mc13xxx_reg_read(mc13xxx, MC13XXX_REVISION, &revision); - if (ret) - return ret; - dev_info(&mc13xxx->spidev->dev, "%s: rev: %d.%d, " + dev_info(mc13xxx->dev, "%s: rev: %d.%d, " "fin: %d, fab: %d, icid: %d/%d\n", - mc13xxx_chipname[*id], + mc13xxx_chipname[mc13xxx->ictype], maskval(revision, MC13XXX_REVISION_REVFULL), maskval(revision, MC13XXX_REVISION_REVMETAL), maskval(revision, MC13XXX_REVISION_FIN), @@ -530,26 +550,12 @@ static int mc13xxx_identify(struct mc13xxx *mc13xxx, enum mc13xxx_id *id) maskval(revision, MC13XXX_REVISION_ICIDCODE)); } - if (*id != MC13XXX_ID_INVALID) { - const struct spi_device_id *devid = - spi_get_device_id(mc13xxx->spidev); - if (!devid || devid->driver_data != *id) - dev_warn(&mc13xxx->spidev->dev, "device id doesn't " - "match auto detection!\n"); - } - - return 0; + return (mc13xxx->ictype == MC13XXX_ID_INVALID) ? -ENODEV : 0; } static const char *mc13xxx_get_chipname(struct mc13xxx *mc13xxx) { - const struct spi_device_id *devid = - spi_get_device_id(mc13xxx->spidev); - - if (!devid) - return NULL; - - return mc13xxx_chipname[devid->driver_data]; + return mc13xxx_chipname[mc13xxx->ictype]; } int mc13xxx_get_flags(struct mc13xxx *mc13xxx) @@ -592,7 +598,7 @@ int mc13xxx_adc_do_conversion(struct mc13xxx *mc13xxx, unsigned int mode, }; init_completion(&adcdone_data.done); - dev_dbg(&mc13xxx->spidev->dev, "%s\n", __func__); + dev_dbg(mc13xxx->dev, "%s\n", __func__); mc13xxx_lock(mc13xxx); @@ -637,7 +643,8 @@ int mc13xxx_adc_do_conversion(struct mc13xxx *mc13xxx, unsigned int mode, adc1 |= ato << MC13783_ADC1_ATO_SHIFT; if (atox) adc1 |= MC13783_ADC1_ATOX; - dev_dbg(&mc13xxx->spidev->dev, "%s: request irq\n", __func__); + + dev_dbg(mc13xxx->dev, "%s: request irq\n", __func__); mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_ADCDONE, mc13xxx_handler_adcdone, __func__, &adcdone_data); mc13xxx_irq_ack(mc13xxx, MC13XXX_IRQ_ADCDONE); @@ -695,7 +702,7 @@ static int mc13xxx_add_subdevice_pdata(struct mc13xxx *mc13xxx, if (!cell.name) return -ENOMEM; - return mfd_add_devices(&mc13xxx->spidev->dev, -1, &cell, 1, NULL, 0); + return mfd_add_devices(mc13xxx->dev, -1, &cell, 1, NULL, 0); } static int mc13xxx_add_subdevice(struct mc13xxx *mc13xxx, const char *format) @@ -706,7 +713,7 @@ static int mc13xxx_add_subdevice(struct mc13xxx *mc13xxx, const char *format) #ifdef CONFIG_OF static int mc13xxx_probe_flags_dt(struct mc13xxx *mc13xxx) { - struct device_node *np = mc13xxx->spidev->dev.of_node; + struct device_node *np = mc13xxx->dev.of_node; if (!np) return -ENODEV; @@ -752,13 +759,17 @@ static const struct of_device_id mc13xxx_dt_ids[] = { }; MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids); -static int mc13xxx_probe(struct spi_device *spi) +static int mc13xxx_common_init(struct mc13xxx *mc13xxx, + struct mc13xxx_platform_data *pdata, int irq); + +static void mc13xxx_common_cleanup(struct mc13xxx *mc13xxx); + +static int mc13xxx_spi_probe(struct spi_device *spi) { const struct of_device_id *of_id; struct spi_driver *sdrv = to_spi_driver(spi->dev.driver); struct mc13xxx *mc13xxx; struct mc13xxx_platform_data *pdata = dev_get_platdata(&spi->dev); - enum mc13xxx_id id; int ret; of_id = of_match_device(mc13xxx_dt_ids, &spi->dev); @@ -774,13 +785,34 @@ static int mc13xxx_probe(struct spi_device *spi) spi->bits_per_word = 32; spi_setup(spi); + mc13xxx->dev = &spi->dev; mc13xxx->spidev = spi; + ret = mc13xxx_common_init(mc13xxx, pdata, spi->irq); + + if (ret) { + dev_set_drvdata(&spi->dev, NULL); + } else { + const struct spi_device_id *devid = + spi_get_device_id(mc13xxx->spidev); + if (!devid || devid->driver_data != mc13xxx->ictype) + dev_warn(mc13xxx->dev, + "device id doesn't match auto detection!\n"); + } + + return ret; +} + +static int mc13xxx_common_init(struct mc13xxx *mc13xxx, + struct mc13xxx_platform_data *pdata, int irq) +{ + int ret; + mutex_init(&mc13xxx->lock); mc13xxx_lock(mc13xxx); - ret = mc13xxx_identify(mc13xxx, &id); - if (ret || id == MC13XXX_ID_INVALID) + ret = mc13xxx_identify(mc13xxx); + if (ret) goto err_revision; /* mask all irqs */ @@ -792,18 +824,19 @@ static int mc13xxx_probe(struct spi_device *spi) if (ret) goto err_mask; - ret = request_threaded_irq(spi->irq, NULL, mc13xxx_irq_thread, + ret = request_threaded_irq(irq, NULL, mc13xxx_irq_thread, IRQF_ONESHOT | IRQF_TRIGGER_HIGH, "mc13xxx", mc13xxx); if (ret) { err_mask: err_revision: mc13xxx_unlock(mc13xxx); - dev_set_drvdata(&spi->dev, NULL); kfree(mc13xxx); return ret; } + mc13xxx->irq = irq; + mc13xxx_unlock(mc13xxx); if (mc13xxx_probe_flags_dt(mc13xxx) < 0 && pdata) @@ -838,39 +871,44 @@ err_revision: return 0; } -static int __devexit mc13xxx_remove(struct spi_device *spi) +static int __devexit mc13xxx_spi_remove(struct spi_device *spi) { struct mc13xxx *mc13xxx = dev_get_drvdata(&spi->dev); - free_irq(mc13xxx->spidev->irq, mc13xxx); + mc13xxx_common_cleanup(mc13xxx); - mfd_remove_devices(&spi->dev); + return 0; +} - kfree(mc13xxx); +static void mc13xxx_common_cleanup(struct mc13xxx *mc13xxx) +{ + free_irq(mc13xxx->irq, mc13xxx); - return 0; + mfd_remove_devices(mc13xxx->dev); + + kfree(mc13xxx); } -static struct spi_driver mc13xxx_driver = { +static struct spi_driver mc13xxx_spi_driver = { .id_table = mc13xxx_device_id, .driver = { .name = "mc13xxx", .owner = THIS_MODULE, .of_match_table = mc13xxx_dt_ids, }, - .probe = mc13xxx_probe, - .remove = __devexit_p(mc13xxx_remove), + .probe = mc13xxx_spi_probe, + .remove = __devexit_p(mc13xxx_spi_remove), }; static int __init mc13xxx_init(void) { - return spi_register_driver(&mc13xxx_driver); + return spi_register_driver(&mc13xxx_spi_driver); } subsys_initcall(mc13xxx_init); static void __exit mc13xxx_exit(void) { - spi_unregister_driver(&mc13xxx_driver); + spi_unregister_driver(&mc13xxx_spi_driver); } module_exit(mc13xxx_exit); |